/* vi: set sw=4 ts=4: */
/*
- * sh.c -- a prototype Bourne shell grammar parser
- * Intended to follow the original Thompson and Ritchie
- * "small and simple is beautiful" philosophy, which
- * incidentally is a good match to today's BusyBox.
+ * A prototype Bourne shell grammar parser.
+ * Intended to follow the original Thompson and Ritchie
+ * "small and simple is beautiful" philosophy, which
+ * incidentally is a good match to today's BusyBox.
*
* Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
*
* Other credits:
* o_addchr() derived from similar w_addchar function in glibc-2.2.
* setup_redirect(), redirect_opt_num(), and big chunks of main()
- * and many builtins derived from contributions by Erik Andersen
- * miscellaneous bugfixes from Matt Kraai.
+ * and many builtins derived from contributions by Erik Andersen.
+ * Miscellaneous bugfixes from Matt Kraai.
*
* There are two big (and related) architecture differences between
* this parser and the lash parser. One is that this version is
* change { and } from special chars to reserved words
* builtins: return, trap, ulimit
* test magic exec with redirection only
- * check setting of global_argc and global_argv
* follow IFS rules more precisely, including update semantics
* figure out what to do with backslash-newline
* propagate syntax errors, die on resource errors?
* continuation lines, both explicit and implicit - done?
- * memory leak finding and plugging - done?
* maybe change charmap[] to use 2-bit entries
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */
-//TODO: pull in some .h and find out do we have SINGLE_APPLET_MAIN?
+//TODO: pull in some .h and find out whether we have SINGLE_APPLET_MAIN?
//#include "applet_tables.h" doesn't work
#include <glob.h>
/* #include <dmalloc.h> */
#include <fnmatch.h>
#endif
-#define HUSH_VER_STR "0.91"
+#define HUSH_VER_STR "0.92"
#if defined SINGLE_APPLET_MAIN
/* STANDALONE does not make sense, and won't compile */
#define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0
#endif
+/* Do we support ANY keywords? */
+#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
+#define HAS_KEYWORDS 1
+#define IF_HAS_KEYWORDS(...) __VA_ARGS__
+#define IF_HAS_NO_KEYWORDS(...)
+#else
+#define HAS_KEYWORDS 0
+#define IF_HAS_KEYWORDS(...)
+#define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__
+#endif
/* Keep unconditionally on for now */
#define HUSH_DEBUG 1
#endif
-/* Do we support ANY keywords? */
-#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
-#define HAS_KEYWORDS 1
-#define IF_HAS_KEYWORDS(...) __VA_ARGS__
-#define IF_HAS_NO_KEYWORDS(...)
-#else
-#define HAS_KEYWORDS 0
-#define IF_HAS_KEYWORDS(...)
-#define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__
-#endif
+static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="HUSH_VER_STR;
+#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
#define SPECIAL_VAR_SYMBOL 3
#define PARSEFLAG_EXIT_FROM_LOOP 1
pid_t pid; /* 0 if exited */
int assignment_cnt; /* how many argv[i] are assignments? */
smallint is_stopped; /* is the command currently running? */
- smallint grp_type;
+ smallint grp_type; /* GRP_xxx */
struct pipe *group; /* if non-NULL, this "prog" is {} group,
* subshell, or a compound statement */
char **argv; /* command name and arguments */
/* "Globals" within this file */
-
/* Sorted roughly by size (smaller offsets == smaller code) */
struct globals {
#if ENABLE_HUSH_INTERACTIVE
} while (0)
-#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
+/* Function prototypes for builtins */
+static int builtin_cd(char **argv);
+static int builtin_echo(char **argv);
+static int builtin_eval(char **argv);
+static int builtin_exec(char **argv);
+static int builtin_exit(char **argv);
+static int builtin_export(char **argv);
+#if ENABLE_HUSH_JOB
+static int builtin_fg_bg(char **argv);
+static int builtin_jobs(char **argv);
+#endif
+#if ENABLE_HUSH_HELP
+static int builtin_help(char **argv);
+#endif
+static int builtin_pwd(char **argv);
+static int builtin_read(char **argv);
+static int builtin_test(char **argv);
+static int builtin_true(char **argv);
+static int builtin_set(char **argv);
+static int builtin_shift(char **argv);
+static int builtin_source(char **argv);
+static int builtin_umask(char **argv);
+static int builtin_unset(char **argv);
+#if ENABLE_HUSH_LOOPS
+static int builtin_break(char **argv);
+static int builtin_continue(char **argv);
+#endif
+//static int builtin_not_written(char **argv);
+
+/* Table of built-in functions. They can be forked or not, depending on
+ * context: within pipes, they fork. As simple commands, they do not.
+ * When used in non-forking context, they can change global variables
+ * in the parent shell process. If forked, of course they cannot.
+ * For example, 'unset foo | whatever' will parse and run, but foo will
+ * still be set at the end. */
+struct built_in_command {
+ const char *cmd;
+ int (*function)(char **argv);
+#if ENABLE_HUSH_HELP
+ const char *descr;
+#define BLTIN(cmd, func, help) { cmd, func, help }
+#else
+#define BLTIN(cmd, func, help) { cmd, func }
+#endif
+};
+
+/* For now, echo and test are unconditionally enabled.
+ * Maybe make it configurable? */
+static const struct built_in_command bltins[] = {
+ BLTIN("." , builtin_source, "Run commands in a file"),
+ BLTIN(":" , builtin_true, "No-op"),
+ BLTIN("[" , builtin_test, "Test condition"),
+ BLTIN("[[" , builtin_test, "Test condition"),
+#if ENABLE_HUSH_JOB
+ BLTIN("bg" , builtin_fg_bg, "Resume a job in the background"),
+#endif
+#if ENABLE_HUSH_LOOPS
+ BLTIN("break" , builtin_break, "Exit from a loop"),
+#endif
+ BLTIN("cd" , builtin_cd, "Change directory"),
+#if ENABLE_HUSH_LOOPS
+ BLTIN("continue", builtin_continue, "Start new loop iteration"),
+#endif
+ BLTIN("echo" , builtin_echo, "Write to stdout"),
+ BLTIN("eval" , builtin_eval, "Construct and run shell command"),
+ BLTIN("exec" , builtin_exec, "Execute command, don't return to shell"),
+ BLTIN("exit" , builtin_exit, "Exit"),
+ BLTIN("export", builtin_export, "Set environment variable"),
+#if ENABLE_HUSH_JOB
+ BLTIN("fg" , builtin_fg_bg, "Bring job into the foreground"),
+ BLTIN("jobs" , builtin_jobs, "List active jobs"),
+#endif
+ BLTIN("pwd" , builtin_pwd, "Print current directory"),
+ BLTIN("read" , builtin_read, "Input environment variable"),
+// BLTIN("return", builtin_not_written, "Return from a function"),
+ BLTIN("set" , builtin_set, "Set/unset shell local variables"),
+ BLTIN("shift" , builtin_shift, "Shift positional parameters"),
+// BLTIN("trap" , builtin_not_written, "Trap signals"),
+ BLTIN("test" , builtin_test, "Test condition"),
+// BLTIN("ulimit", builtin_not_written, "Control resource limits"),
+ BLTIN("umask" , builtin_umask, "Set file creation mask"),
+ BLTIN("unset" , builtin_unset, "Unset environment variable"),
+#if ENABLE_HUSH_HELP
+ BLTIN("help" , builtin_help, "List shell built-in commands"),
+#endif
+};
+
#if 1
/* Normal */
bb_error_msg_and_die(msg ? "%s: %s" : "syntax error", "syntax error", msg);
#endif
}
-
#else
/* Debug */
static void syntax_lineno(int line)
#define syntax(str) syntax_lineno(__LINE__)
#endif
-/* Index of subroutines: */
-/* in_str manipulations: */
-static int static_get(struct in_str *i);
-static int static_peek(struct in_str *i);
-static int file_get(struct in_str *i);
-static int file_peek(struct in_str *i);
-static void setup_file_in_str(struct in_str *i, FILE *f);
-static void setup_string_in_str(struct in_str *i, const char *s);
-/* "run" the final data structures: */
-#if !defined(DEBUG_CLEAN)
-#define free_pipe_list(head, indent) free_pipe_list(head)
-#define free_pipe(pi, indent) free_pipe(pi)
-#endif
-static int free_pipe_list(struct pipe *head, int indent);
-static int free_pipe(struct pipe *pi, int indent);
-/* really run the final data structures: */
-typedef struct nommu_save_t {
- char **new_env;
- char **old_env;
- char **argv;
-} nommu_save_t;
-#if BB_MMU
-#define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \
- pseudo_exec_argv(argv, assignment_cnt, argv_expanded)
-#define pseudo_exec(nommu_save, command, argv_expanded) \
- pseudo_exec(command, argv_expanded)
-#endif
-static void pseudo_exec_argv(nommu_save_t *nommu_save, char **argv, int assignment_cnt, char **argv_expanded) NORETURN;
-static void pseudo_exec(nommu_save_t *nommu_save, struct command *command, char **argv_expanded) NORETURN;
-static int setup_redirects(struct command *prog, int squirrel[]);
-static int run_list(struct pipe *pi);
-static int run_pipe(struct pipe *pi);
-/* data structure manipulation: */
-static int setup_redirect(struct parse_context *ctx, int fd, redir_type style, struct in_str *input);
-static void initialize_context(struct parse_context *ctx);
-static int done_word(o_string *dest, struct parse_context *ctx);
-static int done_command(struct parse_context *ctx);
-static void done_pipe(struct parse_context *ctx, pipe_style type);
-/* primary string parsing: */
-static int redirect_dup_num(struct in_str *input);
-static int redirect_opt_num(o_string *o);
-#if ENABLE_HUSH_TICK
-static int process_command_subs(o_string *dest,
- struct in_str *input, const char *subst_end);
-#endif
-static int parse_group(o_string *dest, struct parse_context *ctx, struct in_str *input, int ch);
-static const char *lookup_param(const char *src);
-static int handle_dollar(o_string *dest,
- struct in_str *input);
-static int parse_stream(o_string *dest, struct parse_context *ctx, struct in_str *input0, const char *end_trigger);
-/* setup: */
-static int parse_and_run_stream(struct in_str *inp, int parse_flag);
-static int parse_and_run_string(const char *s, int parse_flag);
-static int parse_and_run_file(FILE *f);
-/* job management: */
-static int checkjobs(struct pipe* fg_pipe);
-#if ENABLE_HUSH_JOB
-static int checkjobs_and_fg_shell(struct pipe* fg_pipe);
-static void insert_bg_job(struct pipe *pi);
-static void remove_bg_job(struct pipe *pi);
-static void delete_finished_bg_job(struct pipe *pi);
-#else
-int checkjobs_and_fg_shell(struct pipe* fg_pipe); /* never called */
-#endif
-/* local variable support */
-static char **expand_strvec_to_strvec(char **argv);
-/* used for eval */
-static char *expand_strvec_to_string(char **argv);
-/* used for expansion of right hand of assignments */
-static char *expand_string_to_string(const char *str);
-static struct variable *get_local_var(const char *name);
-static int set_local_var(char *str, int flg_export);
-static void unset_local_var(const char *name);
-
-
-static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="HUSH_VER_STR;
-
-
static int glob_needed(const char *s)
{
while (*s) {
}
-/* Function prototypes for builtins */
-static int builtin_cd(char **argv);
-static int builtin_echo(char **argv);
-static int builtin_eval(char **argv);
-static int builtin_exec(char **argv);
-static int builtin_exit(char **argv);
-static int builtin_export(char **argv);
-#if ENABLE_HUSH_JOB
-static int builtin_fg_bg(char **argv);
-static int builtin_jobs(char **argv);
-#endif
-#if ENABLE_HUSH_HELP
-static int builtin_help(char **argv);
-#endif
-static int builtin_pwd(char **argv);
-static int builtin_read(char **argv);
-static int builtin_test(char **argv);
-static int builtin_true(char **argv);
-static int builtin_set(char **argv);
-static int builtin_shift(char **argv);
-static int builtin_source(char **argv);
-static int builtin_umask(char **argv);
-static int builtin_unset(char **argv);
-#if ENABLE_HUSH_LOOPS
-static int builtin_break(char **argv);
-static int builtin_continue(char **argv);
-#endif
-//static int builtin_not_written(char **argv);
-
-/* Table of built-in functions. They can be forked or not, depending on
- * context: within pipes, they fork. As simple commands, they do not.
- * When used in non-forking context, they can change global variables
- * in the parent shell process. If forked, of course they cannot.
- * For example, 'unset foo | whatever' will parse and run, but foo will
- * still be set at the end. */
-struct built_in_command {
- const char *cmd;
- int (*function)(char **argv);
-#if ENABLE_HUSH_HELP
- const char *descr;
-#define BLTIN(cmd, func, help) { cmd, func, help }
-#else
-#define BLTIN(cmd, func, help) { cmd, func }
-#endif
-};
-
-/* For now, echo and test are unconditionally enabled.
- * Maybe make it configurable? */
-static const struct built_in_command bltins[] = {
- BLTIN("." , builtin_source, "Run commands in a file"),
- BLTIN(":" , builtin_true, "No-op"),
- BLTIN("[" , builtin_test, "Test condition"),
- BLTIN("[[" , builtin_test, "Test condition"),
-#if ENABLE_HUSH_JOB
- BLTIN("bg" , builtin_fg_bg, "Resume a job in the background"),
-#endif
-#if ENABLE_HUSH_LOOPS
- BLTIN("break" , builtin_break, "Exit from a loop"),
-#endif
- BLTIN("cd" , builtin_cd, "Change directory"),
-#if ENABLE_HUSH_LOOPS
- BLTIN("continue", builtin_continue, "Start new loop iteration"),
-#endif
- BLTIN("echo" , builtin_echo, "Write to stdout"),
- BLTIN("eval" , builtin_eval, "Construct and run shell command"),
- BLTIN("exec" , builtin_exec, "Execute command, don't return to shell"),
- BLTIN("exit" , builtin_exit, "Exit"),
- BLTIN("export", builtin_export, "Set environment variable"),
-#if ENABLE_HUSH_JOB
- BLTIN("fg" , builtin_fg_bg, "Bring job into the foreground"),
- BLTIN("jobs" , builtin_jobs, "List active jobs"),
-#endif
- BLTIN("pwd" , builtin_pwd, "Print current directory"),
- BLTIN("read" , builtin_read, "Input environment variable"),
-// BLTIN("return", builtin_not_written, "Return from a function"),
- BLTIN("set" , builtin_set, "Set/unset shell local variables"),
- BLTIN("shift" , builtin_shift, "Shift positional parameters"),
-// BLTIN("trap" , builtin_not_written, "Trap signals"),
- BLTIN("test" , builtin_test, "Test condition"),
-// BLTIN("ulimit", builtin_not_written, "Control resource limits"),
- BLTIN("umask" , builtin_umask, "Set file creation mask"),
- BLTIN("unset" , builtin_unset, "Unset environment variable"),
-#if ENABLE_HUSH_HELP
- BLTIN("help" , builtin_help, "List shell built-in commands"),
-#endif
-};
-
-
/* Signals are grouped, we handle them in batches */
static void set_misc_sighandler(void (*handler)(int))
{
static const char *set_cwd(void)
{
+ /* xrealloc_getcwd_or_warn(arg) calls free(arg),
+ * we must not try to free(bb_msg_unknown) */
if (G.cwd == bb_msg_unknown)
- G.cwd = NULL; /* xrealloc_getcwd_or_warn(arg) calls free(arg)! */
+ G.cwd = NULL;
G.cwd = xrealloc_getcwd_or_warn((char *)G.cwd);
if (!G.cwd)
G.cwd = bb_msg_unknown;
}
-/*
- * o_string support
- */
-#define B_CHUNK (32 * sizeof(char*))
-
-static void o_reset(o_string *o)
+/* Get/check local shell variables */
+static struct variable *get_local_var(const char *name)
{
- o->length = 0;
- o->nonnull = 0;
- if (o->data)
- o->data[0] = '\0';
+ struct variable *cur;
+ int len;
+
+ if (!name)
+ return NULL;
+ len = strlen(name);
+ for (cur = G.top_var; cur; cur = cur->next) {
+ if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
+ return cur;
+ }
+ return NULL;
}
-static void o_free(o_string *o)
-{
- free(o->data);
- memset(o, 0, sizeof(*o));
+/* Basically useful version until someone wants to get fancier,
+ * see the bash man page under "Parameter Expansion" */
+static const char *lookup_param(const char *src)
+{
+ struct variable *var = get_local_var(src);
+ if (var)
+ return strchr(var->varstr, '=') + 1;
+ return NULL;
}
-static void o_grow_by(o_string *o, int len)
+/* str holds "NAME=VAL" and is expected to be malloced.
+ * We take ownership of it. */
+static int set_local_var(char *str, int flg_export)
{
- if (o->length + len > o->maxlen) {
- o->maxlen += (2*len > B_CHUNK ? 2*len : B_CHUNK);
- o->data = xrealloc(o->data, 1 + o->maxlen);
+ struct variable *cur;
+ char *value;
+ int name_len;
+
+ value = strchr(str, '=');
+ if (!value) { /* not expected to ever happen? */
+ free(str);
+ return -1;
}
-}
-static void o_addchr(o_string *o, int ch)
-{
- debug_printf("o_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o);
- o_grow_by(o, 1);
- o->data[o->length] = ch;
- o->length++;
- o->data[o->length] = '\0';
-}
+ name_len = value - str + 1; /* including '=' */
+ cur = G.top_var; /* cannot be NULL (we have HUSH_VERSION and it's RO) */
+ while (1) {
+ if (strncmp(cur->varstr, str, name_len) != 0) {
+ if (!cur->next) {
+ /* Bail out. Note that now cur points
+ * to last var in linked list */
+ break;
+ }
+ cur = cur->next;
+ continue;
+ }
+ /* We found an existing var with this name */
+ *value = '\0';
+ if (cur->flg_read_only) {
+ bb_error_msg("%s: readonly variable", str);
+ free(str);
+ return -1;
+ }
+ debug_printf_env("%s: unsetenv '%s'\n", __func__, str);
+ unsetenv(str); /* just in case */
+ *value = '=';
+ if (strcmp(cur->varstr, str) == 0) {
+ free_and_exp:
+ free(str);
+ goto exp;
+ }
+ if (cur->max_len >= strlen(str)) {
+ /* This one is from startup env, reuse space */
+ strcpy(cur->varstr, str);
+ goto free_and_exp;
+ }
+ /* max_len == 0 signifies "malloced" var, which we can
+ * (and has to) free */
+ if (!cur->max_len)
+ free(cur->varstr);
+ cur->max_len = 0;
+ goto set_str_and_exp;
+ }
-static void o_addstr(o_string *o, const char *str, int len)
-{
- o_grow_by(o, len);
- memcpy(&o->data[o->length], str, len);
- o->length += len;
- o->data[o->length] = '\0';
+ /* Not found - create next variable struct */
+ cur->next = xzalloc(sizeof(*cur));
+ cur = cur->next;
+
+ set_str_and_exp:
+ cur->varstr = str;
+ exp:
+ if (flg_export)
+ cur->flg_export = 1;
+ if (cur->flg_export) {
+ debug_printf_env("%s: putenv '%s'\n", __func__, cur->varstr);
+ return putenv(cur->varstr);
+ }
+ return 0;
}
-static void o_addstr_duplicate_backslash(o_string *o, const char *str, int len)
+static void unset_local_var(const char *name)
{
- while (len) {
- o_addchr(o, *str);
- if (*str++ == '\\'
- && (*str != '*' && *str != '?' && *str != '[')
- ) {
- o_addchr(o, '\\');
+ struct variable *cur;
+ struct variable *prev = prev; /* for gcc */
+ int name_len;
+
+ if (!name)
+ return;
+ name_len = strlen(name);
+ cur = G.top_var;
+ while (cur) {
+ if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') {
+ if (cur->flg_read_only) {
+ bb_error_msg("%s: readonly variable", name);
+ return;
+ }
+ /* prev is ok to use here because 1st variable, HUSH_VERSION,
+ * is ro, and we cannot reach this code on the 1st pass */
+ prev->next = cur->next;
+ debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr);
+ bb_unsetenv(cur->varstr);
+ if (!cur->max_len)
+ free(cur->varstr);
+ free(cur);
+ return;
}
- len--;
+ prev = cur;
+ cur = cur->next;
}
}
-/* My analysis of quoting semantics tells me that state information
- * is associated with a destination, not a source.
+
+/*
+ * in_str support
*/
-static void o_addqchr(o_string *o, int ch)
+static int static_get(struct in_str *i)
{
- int sz = 1;
- char *found = strchr("*?[\\", ch);
- if (found)
- sz++;
- o_grow_by(o, sz);
- if (found) {
- o->data[o->length] = '\\';
- o->length++;
- }
- o->data[o->length] = ch;
- o->length++;
- o->data[o->length] = '\0';
+ int ch = *i->p++;
+ if (ch == '\0') return EOF;
+ return ch;
}
-static void o_addQchr(o_string *o, int ch)
+static int static_peek(struct in_str *i)
{
- int sz = 1;
- if (o->o_quote && strchr("*?[\\", ch)) {
- sz++;
- o->data[o->length] = '\\';
- o->length++;
- }
- o_grow_by(o, sz);
- o->data[o->length] = ch;
- o->length++;
- o->data[o->length] = '\0';
+ return *i->p;
}
-static void o_addQstr(o_string *o, const char *str, int len)
-{
- if (!o->o_quote) {
- o_addstr(o, str, len);
- return;
- }
- while (len) {
- char ch;
- int sz;
- int ordinary_cnt = strcspn(str, "*?[\\");
- if (ordinary_cnt > len) /* paranoia */
- ordinary_cnt = len;
- o_addstr(o, str, ordinary_cnt);
- if (ordinary_cnt == len)
- return;
- str += ordinary_cnt;
- len -= ordinary_cnt + 1; /* we are processing + 1 char below */
+#if ENABLE_HUSH_INTERACTIVE
- ch = *str++;
- sz = 1;
- if (ch) { /* it is necessarily one of "*?[\\" */
- sz++;
- o->data[o->length] = '\\';
- o->length++;
- }
- o_grow_by(o, sz);
- o->data[o->length] = ch;
- o->length++;
- o->data[o->length] = '\0';
- }
+#if ENABLE_FEATURE_EDITING
+static void cmdedit_set_initial_prompt(void)
+{
+#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
+ G.PS1 = NULL;
+#else
+ G.PS1 = getenv("PS1");
+ if (G.PS1 == NULL)
+ G.PS1 = "\\w \\$ ";
+#endif
}
+#endif /* EDITING */
-/* A special kind of o_string for $VAR and `cmd` expansion.
- * It contains char* list[] at the beginning, which is grown in 16 element
- * increments. Actual string data starts at the next multiple of 16 * (char*).
- * list[i] contains an INDEX (int!) into this string data.
- * It means that if list[] needs to grow, data needs to be moved higher up
- * but list[i]'s need not be modified.
- * NB: remembering how many list[i]'s you have there is crucial.
- * o_finalize_list() operation post-processes this structure - calculates
- * and stores actual char* ptrs in list[]. Oh, it NULL terminates it as well.
- */
-#if DEBUG_EXPAND || DEBUG_GLOB
-static void debug_print_list(const char *prefix, o_string *o, int n)
+static const char* setup_prompt_string(int promptmode)
{
- char **list = (char**)o->data;
- int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
- int i = 0;
- fprintf(stderr, "%s: list:%p n:%d string_start:%d length:%d maxlen:%d\n",
- prefix, list, n, string_start, o->length, o->maxlen);
- while (i < n) {
- fprintf(stderr, " list[%d]=%d '%s' %p\n", i, (int)list[i],
- o->data + (int)list[i] + string_start,
- o->data + (int)list[i] + string_start);
- i++;
- }
- if (n) {
- const char *p = o->data + (int)list[n - 1] + string_start;
- fprintf(stderr, " total_sz:%d\n", (p + strlen(p) + 1) - o->data);
+ const char *prompt_str;
+ debug_printf("setup_prompt_string %d ", promptmode);
+#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
+ /* Set up the prompt */
+ if (promptmode == 0) { /* PS1 */
+ free((char*)G.PS1);
+ G.PS1 = xasprintf("%s %c ", G.cwd, (geteuid() != 0) ? '$' : '#');
+ prompt_str = G.PS1;
+ } else {
+ prompt_str = G.PS2;
}
-}
#else
-#define debug_print_list(prefix, o, n) ((void)0)
+ prompt_str = (promptmode == 0) ? G.PS1 : G.PS2;
#endif
+ debug_printf("result '%s'\n", prompt_str);
+ return prompt_str;
+}
-/* n = o_save_ptr_helper(str, n) "starts new string" by storing an index value
- * in list[n] so that it points past last stored byte so far.
- * It returns n+1. */
-static int o_save_ptr_helper(o_string *o, int n)
+static void get_user_input(struct in_str *i)
{
- char **list = (char**)o->data;
- int string_start;
- int string_len;
-
- if (!o->has_empty_slot) {
- string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
- string_len = o->length - string_start;
- if (!(n & 0xf)) { /* 0, 0x10, 0x20...? */
- debug_printf_list("list[%d]=%d string_start=%d (growing)\n", n, string_len, string_start);
- /* list[n] points to string_start, make space for 16 more pointers */
- o->maxlen += 0x10 * sizeof(list[0]);
- o->data = xrealloc(o->data, o->maxlen + 1);
- list = (char**)o->data;
- memmove(list + n + 0x10, list + n, string_len);
- o->length += 0x10 * sizeof(list[0]);
- } else
- debug_printf_list("list[%d]=%d string_start=%d\n", n, string_len, string_start);
- } else {
- /* We have empty slot at list[n], reuse without growth */
- string_start = ((n+1 + 0xf) & ~0xf) * sizeof(list[0]); /* NB: n+1! */
- string_len = o->length - string_start;
- debug_printf_list("list[%d]=%d string_start=%d (empty slot)\n", n, string_len, string_start);
- o->has_empty_slot = 0;
- }
- list[n] = (char*)(ptrdiff_t)string_len;
- return n + 1;
-}
-
-/* "What was our last o_save_ptr'ed position (byte offset relative o->data)?" */
-static int o_get_last_ptr(o_string *o, int n)
-{
- char **list = (char**)o->data;
- int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
-
- return ((int)(ptrdiff_t)list[n-1]) + string_start;
-}
-
-/* o_glob performs globbing on last list[], saving each result
- * as a new list[]. */
-static int o_glob(o_string *o, int n)
-{
- glob_t globdata;
- int gr;
- char *pattern;
-
- debug_printf_glob("start o_glob: n:%d o->data:%p\n", n, o->data);
- if (!o->data)
- return o_save_ptr_helper(o, n);
- pattern = o->data + o_get_last_ptr(o, n);
- debug_printf_glob("glob pattern '%s'\n", pattern);
- if (!glob_needed(pattern)) {
- literal:
- o->length = unbackslash(pattern) - o->data;
- debug_printf_glob("glob pattern '%s' is literal\n", pattern);
- return o_save_ptr_helper(o, n);
- }
-
- memset(&globdata, 0, sizeof(globdata));
- gr = glob(pattern, 0, NULL, &globdata);
- debug_printf_glob("glob('%s'):%d\n", pattern, gr);
- if (gr == GLOB_NOSPACE)
- bb_error_msg_and_die("out of memory during glob");
- if (gr == GLOB_NOMATCH) {
- globfree(&globdata);
- goto literal;
- }
- if (gr != 0) { /* GLOB_ABORTED ? */
-//TODO: testcase for bad glob pattern behavior
- bb_error_msg("glob(3) error %d on '%s'", gr, pattern);
- }
- if (globdata.gl_pathv && globdata.gl_pathv[0]) {
- char **argv = globdata.gl_pathv;
- o->length = pattern - o->data; /* "forget" pattern */
- while (1) {
- o_addstr(o, *argv, strlen(*argv) + 1);
- n = o_save_ptr_helper(o, n);
- argv++;
- if (!*argv)
- break;
- }
- }
- globfree(&globdata);
- if (DEBUG_GLOB)
- debug_print_list("o_glob returning", o, n);
- return n;
-}
-
-/* If o->o_glob == 1, glob the string so far remembered.
- * Otherwise, just finish current list[] and start new */
-static int o_save_ptr(o_string *o, int n)
-{
- if (o->o_glob) { /* if globbing is requested */
- /* If o->has_empty_slot, list[n] was already globbed
- * (if it was requested back then when it was filled)
- * so don't do that again! */
- if (!o->has_empty_slot)
- return o_glob(o, n); /* o_save_ptr_helper is inside */
- }
- return o_save_ptr_helper(o, n);
-}
-
-/* "Please convert list[n] to real char* ptrs, and NULL terminate it." */
-static char **o_finalize_list(o_string *o, int n)
-{
- char **list;
- int string_start;
-
- n = o_save_ptr(o, n); /* force growth for list[n] if necessary */
- if (DEBUG_EXPAND)
- debug_print_list("finalized", o, n);
- debug_printf_expand("finalized n:%d\n", n);
- list = (char**)o->data;
- string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
- list[--n] = NULL;
- while (n) {
- n--;
- list[n] = o->data + (int)(ptrdiff_t)list[n] + string_start;
- }
- return list;
-}
-
-
-/*
- * in_str support
- */
-static int static_get(struct in_str *i)
-{
- int ch = *i->p++;
- if (ch == '\0') return EOF;
- return ch;
-}
-
-static int static_peek(struct in_str *i)
-{
- return *i->p;
-}
-
-#if ENABLE_HUSH_INTERACTIVE
-
-#if ENABLE_FEATURE_EDITING
-static void cmdedit_set_initial_prompt(void)
-{
-#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
- G.PS1 = NULL;
-#else
- G.PS1 = getenv("PS1");
- if (G.PS1 == NULL)
- G.PS1 = "\\w \\$ ";
-#endif
-}
-#endif /* EDITING */
-
-static const char* setup_prompt_string(int promptmode)
-{
- const char *prompt_str;
- debug_printf("setup_prompt_string %d ", promptmode);
-#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
- /* Set up the prompt */
- if (promptmode == 0) { /* PS1 */
- free((char*)G.PS1);
- G.PS1 = xasprintf("%s %c ", G.cwd, (geteuid() != 0) ? '$' : '#');
- prompt_str = G.PS1;
- } else {
- prompt_str = G.PS2;
- }
-#else
- prompt_str = (promptmode == 0) ? G.PS1 : G.PS2;
-#endif
- debug_printf("result '%s'\n", prompt_str);
- return prompt_str;
-}
-
-static void get_user_input(struct in_str *i)
-{
- int r;
- const char *prompt_str;
+ int r;
+ const char *prompt_str;
prompt_str = setup_prompt_string(i->promptmode);
#if ENABLE_FEATURE_EDITING
}
-/* squirrel != NULL means we squirrel away copies of stdin, stdout,
- * and stderr if they are redirected. */
-static int setup_redirects(struct command *prog, int squirrel[])
-{
- int openfd, mode;
- struct redir_struct *redir;
-
- for (redir = prog->redirects; redir; redir = redir->next) {
- if (redir->dup == -1 && redir->rd_filename == NULL) {
- /* something went wrong in the parse. Pretend it didn't happen */
- continue;
- }
- if (redir->dup == -1) {
- char *p;
- mode = redir_table[redir->rd_type].mode;
-//TODO: check redir for names like '\\'
- p = expand_string_to_string(redir->rd_filename);
- openfd = open_or_warn(p, mode);
- free(p);
- if (openfd < 0) {
- /* this could get lost if stderr has been redirected, but
- bash and ash both lose it as well (though zsh doesn't!) */
- return 1;
- }
- } else {
- openfd = redir->dup;
- }
+/*
+ * o_string support
+ */
+#define B_CHUNK (32 * sizeof(char*))
- if (openfd != redir->fd) {
- if (squirrel && redir->fd < 3) {
- squirrel[redir->fd] = dup(redir->fd);
- }
- if (openfd == -3) {
- //close(openfd); // close(-3) ??!
- } else {
- dup2(openfd, redir->fd);
- if (redir->dup == -1)
- close(openfd);
- }
- }
- }
- return 0;
+static void o_reset(o_string *o)
+{
+ o->length = 0;
+ o->nonnull = 0;
+ if (o->data)
+ o->data[0] = '\0';
}
-static void restore_redirects(int squirrel[])
+static void o_free(o_string *o)
{
- int i, fd;
- for (i = 0; i < 3; i++) {
- fd = squirrel[i];
- if (fd != -1) {
- /* We simply die on error */
- xmove_fd(fd, i);
- }
- }
+ free(o->data);
+ memset(o, 0, sizeof(*o));
}
-static char **expand_assignments(char **argv, int count)
+static void o_grow_by(o_string *o, int len)
{
- int i;
- char **p = NULL;
- /* Expand assignments into one string each */
- for (i = 0; i < count; i++) {
- p = add_string_to_strings(p, expand_string_to_string(argv[i]));
+ if (o->length + len > o->maxlen) {
+ o->maxlen += (2*len > B_CHUNK ? 2*len : B_CHUNK);
+ o->data = xrealloc(o->data, 1 + o->maxlen);
}
- return p;
}
-/* Called after [v]fork() in run_pipe(), or from builtin_exec().
- * Never returns.
- * XXX no exit() here. If you don't exec, use _exit instead.
- * The at_exit handlers apparently confuse the calling process,
- * in particular stdin handling. Not sure why? -- because of vfork! (vda) */
-static void pseudo_exec_argv(nommu_save_t *nommu_save, char **argv, int assignment_cnt, char **argv_expanded)
+static void o_addchr(o_string *o, int ch)
{
- int rcode;
- char **new_env;
- const struct built_in_command *x;
-
- /* If a variable is assigned in a forest, and nobody listens,
- * was it ever really set?
- */
- if (!argv[assignment_cnt])
- _exit(EXIT_SUCCESS);
-
- new_env = expand_assignments(argv, assignment_cnt);
-#if BB_MMU
- putenv_all(new_env);
- free(new_env); /* optional */
-#else
- nommu_save->new_env = new_env;
- nommu_save->old_env = putenv_all_and_save_old(new_env);
-#endif
- if (argv_expanded) {
- argv = argv_expanded;
- } else {
- argv = expand_strvec_to_strvec(argv);
-#if !BB_MMU
- nommu_save->argv = argv;
-#endif
- }
+ debug_printf("o_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o);
+ o_grow_by(o, 1);
+ o->data[o->length] = ch;
+ o->length++;
+ o->data[o->length] = '\0';
+}
- /*
- * Check if the command matches any of the builtins.
- * Depending on context, this might be redundant. But it's
- * easier to waste a few CPU cycles than it is to figure out
- * if this is one of those cases.
- */
- for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
- if (strcmp(argv[0], x->cmd) == 0) {
- debug_printf_exec("running builtin '%s'\n", argv[0]);
- rcode = x->function(argv);
- fflush(stdout);
- _exit(rcode);
- }
- }
+static void o_addstr(o_string *o, const char *str, int len)
+{
+ o_grow_by(o, len);
+ memcpy(&o->data[o->length], str, len);
+ o->length += len;
+ o->data[o->length] = '\0';
+}
- /* Check if the command matches any busybox applets */
-#if ENABLE_FEATURE_SH_STANDALONE
- if (strchr(argv[0], '/') == NULL) {
- int a = find_applet_by_name(argv[0]);
- if (a >= 0) {
- if (APPLET_IS_NOEXEC(a)) {
- debug_printf_exec("running applet '%s'\n", argv[0]);
-// is it ok that run_applet_no_and_exit() does exit(), not _exit()?
- run_applet_no_and_exit(a, argv);
- }
- /* re-exec ourselves with the new arguments */
- debug_printf_exec("re-execing applet '%s'\n", argv[0]);
- execvp(bb_busybox_exec_path, argv);
- /* If they called chroot or otherwise made the binary no longer
- * executable, fall through */
+static void o_addstr_duplicate_backslash(o_string *o, const char *str, int len)
+{
+ while (len) {
+ o_addchr(o, *str);
+ if (*str++ == '\\'
+ && (*str != '*' && *str != '?' && *str != '[')
+ ) {
+ o_addchr(o, '\\');
}
+ len--;
}
-#endif
-
- debug_printf_exec("execing '%s'\n", argv[0]);
- execvp(argv[0], argv);
- bb_perror_msg("can't exec '%s'", argv[0]);
- _exit(EXIT_FAILURE);
}
-/* Called after [v]fork() in run_pipe()
+/* My analysis of quoting semantics tells me that state information
+ * is associated with a destination, not a source.
*/
-static void pseudo_exec(nommu_save_t *nommu_save, struct command *command, char **argv_expanded)
+static void o_addqchr(o_string *o, int ch)
{
- if (command->argv)
- pseudo_exec_argv(nommu_save, command->argv, command->assignment_cnt, argv_expanded);
-
- if (command->group) {
-#if !BB_MMU
- bb_error_msg_and_die("nested lists are not supported on NOMMU");
-#else
- int rcode;
- debug_printf_exec("pseudo_exec: run_list\n");
- rcode = run_list(command->group);
- /* OK to leak memory by not calling free_pipe_list,
- * since this process is about to exit */
- _exit(rcode);
-#endif
+ int sz = 1;
+ char *found = strchr("*?[\\", ch);
+ if (found)
+ sz++;
+ o_grow_by(o, sz);
+ if (found) {
+ o->data[o->length] = '\\';
+ o->length++;
}
-
- /* Can happen. See what bash does with ">foo" by itself. */
- debug_printf("trying to pseudo_exec null command\n");
- _exit(EXIT_SUCCESS);
+ o->data[o->length] = ch;
+ o->length++;
+ o->data[o->length] = '\0';
}
-#if ENABLE_HUSH_JOB
-static const char *get_cmdtext(struct pipe *pi)
+static void o_addQchr(o_string *o, int ch)
{
- char **argv;
- char *p;
- int len;
-
- /* This is subtle. ->cmdtext is created only on first backgrounding.
- * (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...)
- * On subsequent bg argv is trashed, but we won't use it */
- if (pi->cmdtext)
- return pi->cmdtext;
- argv = pi->cmds[0].argv;
- if (!argv || !argv[0]) {
- pi->cmdtext = xzalloc(1);
- return pi->cmdtext;
+ int sz = 1;
+ if (o->o_quote && strchr("*?[\\", ch)) {
+ sz++;
+ o->data[o->length] = '\\';
+ o->length++;
}
-
- len = 0;
- do len += strlen(*argv) + 1; while (*++argv);
- pi->cmdtext = p = xmalloc(len);
- argv = pi->cmds[0].argv;
- do {
- len = strlen(*argv);
- memcpy(p, *argv, len);
- p += len;
- *p++ = ' ';
- } while (*++argv);
- p[-1] = '\0';
- return pi->cmdtext;
+ o_grow_by(o, sz);
+ o->data[o->length] = ch;
+ o->length++;
+ o->data[o->length] = '\0';
}
-static void insert_bg_job(struct pipe *pi)
+static void o_addQstr(o_string *o, const char *str, int len)
{
- struct pipe *thejob;
- int i;
-
- /* Linear search for the ID of the job to use */
- pi->jobid = 1;
- for (thejob = G.job_list; thejob; thejob = thejob->next)
- if (thejob->jobid >= pi->jobid)
- pi->jobid = thejob->jobid + 1;
-
- /* Add thejob to the list of running jobs */
- if (!G.job_list) {
- thejob = G.job_list = xmalloc(sizeof(*thejob));
- } else {
- for (thejob = G.job_list; thejob->next; thejob = thejob->next)
- continue;
- thejob->next = xmalloc(sizeof(*thejob));
- thejob = thejob->next;
+ if (!o->o_quote) {
+ o_addstr(o, str, len);
+ return;
}
+ while (len) {
+ char ch;
+ int sz;
+ int ordinary_cnt = strcspn(str, "*?[\\");
+ if (ordinary_cnt > len) /* paranoia */
+ ordinary_cnt = len;
+ o_addstr(o, str, ordinary_cnt);
+ if (ordinary_cnt == len)
+ return;
+ str += ordinary_cnt;
+ len -= ordinary_cnt + 1; /* we are processing + 1 char below */
- /* Physically copy the struct job */
- memcpy(thejob, pi, sizeof(struct pipe));
- thejob->cmds = xzalloc(sizeof(pi->cmds[0]) * pi->num_cmds);
- /* We cannot copy entire pi->cmds[] vector! Double free()s will happen */
- for (i = 0; i < pi->num_cmds; i++) {
-// TODO: do we really need to have so many fields which are just dead weight
-// at execution stage?
- thejob->cmds[i].pid = pi->cmds[i].pid;
- /* all other fields are not used and stay zero */
+ ch = *str++;
+ sz = 1;
+ if (ch) { /* it is necessarily one of "*?[\\" */
+ sz++;
+ o->data[o->length] = '\\';
+ o->length++;
+ }
+ o_grow_by(o, sz);
+ o->data[o->length] = ch;
+ o->length++;
+ o->data[o->length] = '\0';
}
- thejob->next = NULL;
- thejob->cmdtext = xstrdup(get_cmdtext(pi));
-
- /* We don't wait for background thejobs to return -- append it
- to the list of backgrounded thejobs and leave it alone */
- printf("[%d] %d %s\n", thejob->jobid, thejob->cmds[0].pid, thejob->cmdtext);
- G.last_bg_pid = thejob->cmds[0].pid;
- G.last_jobid = thejob->jobid;
}
-static void remove_bg_job(struct pipe *pi)
+/* A special kind of o_string for $VAR and `cmd` expansion.
+ * It contains char* list[] at the beginning, which is grown in 16 element
+ * increments. Actual string data starts at the next multiple of 16 * (char*).
+ * list[i] contains an INDEX (int!) into this string data.
+ * It means that if list[] needs to grow, data needs to be moved higher up
+ * but list[i]'s need not be modified.
+ * NB: remembering how many list[i]'s you have there is crucial.
+ * o_finalize_list() operation post-processes this structure - calculates
+ * and stores actual char* ptrs in list[]. Oh, it NULL terminates it as well.
+ */
+#if DEBUG_EXPAND || DEBUG_GLOB
+static void debug_print_list(const char *prefix, o_string *o, int n)
{
- struct pipe *prev_pipe;
-
- if (pi == G.job_list) {
- G.job_list = pi->next;
- } else {
- prev_pipe = G.job_list;
- while (prev_pipe->next != pi)
- prev_pipe = prev_pipe->next;
- prev_pipe->next = pi->next;
+ char **list = (char**)o->data;
+ int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
+ int i = 0;
+ fprintf(stderr, "%s: list:%p n:%d string_start:%d length:%d maxlen:%d\n",
+ prefix, list, n, string_start, o->length, o->maxlen);
+ while (i < n) {
+ fprintf(stderr, " list[%d]=%d '%s' %p\n", i, (int)list[i],
+ o->data + (int)list[i] + string_start,
+ o->data + (int)list[i] + string_start);
+ i++;
+ }
+ if (n) {
+ const char *p = o->data + (int)list[n - 1] + string_start;
+ fprintf(stderr, " total_sz:%d\n", (p + strlen(p) + 1) - o->data);
}
- if (G.job_list)
- G.last_jobid = G.job_list->jobid;
- else
- G.last_jobid = 0;
}
+#else
+#define debug_print_list(prefix, o, n) ((void)0)
+#endif
-/* Remove a backgrounded job */
-static void delete_finished_bg_job(struct pipe *pi)
+/* n = o_save_ptr_helper(str, n) "starts new string" by storing an index value
+ * in list[n] so that it points past last stored byte so far.
+ * It returns n+1. */
+static int o_save_ptr_helper(o_string *o, int n)
{
- remove_bg_job(pi);
- pi->stopped_cmds = 0;
- free_pipe(pi, 0);
- free(pi);
+ char **list = (char**)o->data;
+ int string_start;
+ int string_len;
+
+ if (!o->has_empty_slot) {
+ string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
+ string_len = o->length - string_start;
+ if (!(n & 0xf)) { /* 0, 0x10, 0x20...? */
+ debug_printf_list("list[%d]=%d string_start=%d (growing)\n", n, string_len, string_start);
+ /* list[n] points to string_start, make space for 16 more pointers */
+ o->maxlen += 0x10 * sizeof(list[0]);
+ o->data = xrealloc(o->data, o->maxlen + 1);
+ list = (char**)o->data;
+ memmove(list + n + 0x10, list + n, string_len);
+ o->length += 0x10 * sizeof(list[0]);
+ } else
+ debug_printf_list("list[%d]=%d string_start=%d\n", n, string_len, string_start);
+ } else {
+ /* We have empty slot at list[n], reuse without growth */
+ string_start = ((n+1 + 0xf) & ~0xf) * sizeof(list[0]); /* NB: n+1! */
+ string_len = o->length - string_start;
+ debug_printf_list("list[%d]=%d string_start=%d (empty slot)\n", n, string_len, string_start);
+ o->has_empty_slot = 0;
+ }
+ list[n] = (char*)(ptrdiff_t)string_len;
+ return n + 1;
}
-#endif /* JOB */
-/* Check to see if any processes have exited -- if they
- * have, figure out why and see if a job has completed */
-static int checkjobs(struct pipe* fg_pipe)
+/* "What was our last o_save_ptr'ed position (byte offset relative o->data)?" */
+static int o_get_last_ptr(o_string *o, int n)
{
- int attributes;
- int status;
-#if ENABLE_HUSH_JOB
- struct pipe *pi;
-#endif
- pid_t childpid;
- int rcode = 0;
-
- attributes = WUNTRACED;
- if (fg_pipe == NULL)
- attributes |= WNOHANG;
-
-/* Do we do this right?
- * bash-3.00# sleep 20 | false
- * <ctrl-Z pressed>
- * [3]+ Stopped sleep 20 | false
- * bash-3.00# echo $?
- * 1 <========== bg pipe is not fully done, but exitcode is already known!
- */
+ char **list = (char**)o->data;
+ int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
-//FIXME: non-interactive bash does not continue even if all processes in fg pipe
-//are stopped. Testcase: "cat | cat" in a script (not on command line)
-// + killall -STOP cat
+ return ((int)(ptrdiff_t)list[n-1]) + string_start;
+}
- wait_more:
-// TODO: safe_waitpid?
- while ((childpid = waitpid(-1, &status, attributes)) > 0) {
- int i;
- const int dead = WIFEXITED(status) || WIFSIGNALED(status);
-#if DEBUG_JOBS
- if (WIFSTOPPED(status))
- debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
- childpid, WSTOPSIG(status), WEXITSTATUS(status));
- if (WIFSIGNALED(status))
- debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n",
- childpid, WTERMSIG(status), WEXITSTATUS(status));
- if (WIFEXITED(status))
- debug_printf_jobs("pid %d exited, exitcode %d\n",
- childpid, WEXITSTATUS(status));
-#endif
- /* Were we asked to wait for fg pipe? */
- if (fg_pipe) {
- for (i = 0; i < fg_pipe->num_cmds; i++) {
- debug_printf_jobs("check pid %d\n", fg_pipe->cmds[i].pid);
- if (fg_pipe->cmds[i].pid != childpid)
- continue;
- /* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */
- if (dead) {
- fg_pipe->cmds[i].pid = 0;
- fg_pipe->alive_cmds--;
- if (i == fg_pipe->num_cmds - 1) {
- /* last process gives overall exitstatus */
- rcode = WEXITSTATUS(status);
- IF_HAS_KEYWORDS(if (fg_pipe->pi_inverted) rcode = !rcode;)
- }
- } else {
- fg_pipe->cmds[i].is_stopped = 1;
- fg_pipe->stopped_cmds++;
- }
- debug_printf_jobs("fg_pipe: alive_cmds %d stopped_cmds %d\n",
- fg_pipe->alive_cmds, fg_pipe->stopped_cmds);
- if (fg_pipe->alive_cmds - fg_pipe->stopped_cmds <= 0) {
- /* All processes in fg pipe have exited/stopped */
-#if ENABLE_HUSH_JOB
- if (fg_pipe->alive_cmds)
- insert_bg_job(fg_pipe);
-#endif
- return rcode;
- }
- /* There are still running processes in the fg pipe */
- goto wait_more; /* do waitpid again */
- }
- /* it wasnt fg_pipe, look for process in bg pipes */
- }
+/* o_glob performs globbing on last list[], saving each result
+ * as a new list[]. */
+static int o_glob(o_string *o, int n)
+{
+ glob_t globdata;
+ int gr;
+ char *pattern;
-#if ENABLE_HUSH_JOB
- /* We asked to wait for bg or orphaned children */
- /* No need to remember exitcode in this case */
- for (pi = G.job_list; pi; pi = pi->next) {
- for (i = 0; i < pi->num_cmds; i++) {
- if (pi->cmds[i].pid == childpid)
- goto found_pi_and_prognum;
- }
- }
- /* Happens when shell is used as init process (init=/bin/sh) */
- debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
- continue; /* do waitpid again */
+ debug_printf_glob("start o_glob: n:%d o->data:%p\n", n, o->data);
+ if (!o->data)
+ return o_save_ptr_helper(o, n);
+ pattern = o->data + o_get_last_ptr(o, n);
+ debug_printf_glob("glob pattern '%s'\n", pattern);
+ if (!glob_needed(pattern)) {
+ literal:
+ o->length = unbackslash(pattern) - o->data;
+ debug_printf_glob("glob pattern '%s' is literal\n", pattern);
+ return o_save_ptr_helper(o, n);
+ }
- found_pi_and_prognum:
- if (dead) {
- /* child exited */
- pi->cmds[i].pid = 0;
- pi->alive_cmds--;
- if (!pi->alive_cmds) {
- printf(JOB_STATUS_FORMAT, pi->jobid,
- "Done", pi->cmdtext);
- delete_finished_bg_job(pi);
- }
- } else {
- /* child stopped */
- pi->cmds[i].is_stopped = 1;
- pi->stopped_cmds++;
+ memset(&globdata, 0, sizeof(globdata));
+ gr = glob(pattern, 0, NULL, &globdata);
+ debug_printf_glob("glob('%s'):%d\n", pattern, gr);
+ if (gr == GLOB_NOSPACE)
+ bb_error_msg_and_die("out of memory during glob");
+ if (gr == GLOB_NOMATCH) {
+ globfree(&globdata);
+ goto literal;
+ }
+ if (gr != 0) { /* GLOB_ABORTED ? */
+//TODO: testcase for bad glob pattern behavior
+ bb_error_msg("glob(3) error %d on '%s'", gr, pattern);
+ }
+ if (globdata.gl_pathv && globdata.gl_pathv[0]) {
+ char **argv = globdata.gl_pathv;
+ o->length = pattern - o->data; /* "forget" pattern */
+ while (1) {
+ o_addstr(o, *argv, strlen(*argv) + 1);
+ n = o_save_ptr_helper(o, n);
+ argv++;
+ if (!*argv)
+ break;
}
-#endif
- } /* while (waitpid succeeds)... */
-
- /* wait found no children or failed */
-
- if (childpid && errno != ECHILD)
- bb_perror_msg("waitpid");
- return rcode;
+ }
+ globfree(&globdata);
+ if (DEBUG_GLOB)
+ debug_print_list("o_glob returning", o, n);
+ return n;
}
-#if ENABLE_HUSH_JOB
-static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
+/* If o->o_glob == 1, glob the string so far remembered.
+ * Otherwise, just finish current list[] and start new */
+static int o_save_ptr(o_string *o, int n)
{
- pid_t p;
- int rcode = checkjobs(fg_pipe);
- /* Job finished, move the shell to the foreground */
- p = getpgid(0); /* pgid of our process */
- debug_printf_jobs("fg'ing ourself: getpgid(0)=%d\n", (int)p);
- tcsetpgrp(G.interactive_fd, p);
- return rcode;
+ if (o->o_glob) { /* if globbing is requested */
+ /* If o->has_empty_slot, list[n] was already globbed
+ * (if it was requested back then when it was filled)
+ * so don't do that again! */
+ if (!o->has_empty_slot)
+ return o_glob(o, n); /* o_save_ptr_helper is inside */
+ }
+ return o_save_ptr_helper(o, n);
}
-#endif
-/* run_pipe() starts all the jobs, but doesn't wait for anything
- * to finish. See checkjobs().
- *
- * return code is normally -1, when the caller has to wait for children
- * to finish to determine the exit status of the pipe. If the pipe
- * is a simple builtin command, however, the action is done by the
- * time run_pipe returns, and the exit code is provided as the
- * return value.
- *
- * The input of the pipe is always stdin, the output is always
- * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
- * because it tries to avoid running the command substitution in
- * subshell, when that is in fact necessary. The subshell process
- * now has its stdout directed to the input of the appropriate pipe,
- * so this routine is noticeably simpler.
- *
- * Returns -1 only if started some children. IOW: we have to
- * mask out retvals of builtins etc with 0xff!
- */
-static int run_pipe(struct pipe *pi)
+/* "Please convert list[n] to real char* ptrs, and NULL terminate it." */
+static char **o_finalize_list(o_string *o, int n)
{
- int i;
- int nextin;
- int pipefds[2]; /* pipefds[0] is for reading */
- struct command *command;
- char **argv_expanded;
- char **argv;
- const struct built_in_command *x;
- char *p;
- /* it is not always needed, but we aim to smaller code */
- int squirrel[] = { -1, -1, -1 };
- int rcode;
- const int single_and_fg = (pi->num_cmds == 1 && pi->followup != PIPE_BG);
-
- debug_printf_exec("run_pipe start: single_and_fg=%d\n", single_and_fg);
+ char **list;
+ int string_start;
-#if ENABLE_HUSH_JOB
- pi->pgrp = -1;
-#endif
- pi->alive_cmds = 1;
- pi->stopped_cmds = 0;
-
- /* Check if this is a simple builtin (not part of a pipe).
- * Builtins within pipes have to fork anyway, and are handled in
- * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
- */
- command = &(pi->cmds[0]);
-
-#if ENABLE_HUSH_FUNCTIONS
- if (single_and_fg && command->group && command->grp_type == GRP_FUNCTION) {
- /* We "execute" function definition */
- bb_error_msg("here we ought to remember function definition, and go on");
- return EXIT_SUCCESS;
- }
-#endif
-
- if (single_and_fg && command->group && command->grp_type == GRP_NORMAL) {
- debug_printf("non-subshell grouping\n");
- setup_redirects(command, squirrel);
- debug_printf_exec(": run_list\n");
- rcode = run_list(command->group) & 0xff;
- restore_redirects(squirrel);
- debug_printf_exec("run_pipe return %d\n", rcode);
- IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
- return rcode;
+ n = o_save_ptr(o, n); /* force growth for list[n] if necessary */
+ if (DEBUG_EXPAND)
+ debug_print_list("finalized", o, n);
+ debug_printf_expand("finalized n:%d\n", n);
+ list = (char**)o->data;
+ string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
+ list[--n] = NULL;
+ while (n) {
+ n--;
+ list[n] = o->data + (int)(ptrdiff_t)list[n] + string_start;
}
+ return list;
+}
- argv = command->argv;
- argv_expanded = NULL;
-
- if (single_and_fg && argv != NULL) {
- char **new_env = NULL;
- char **old_env = NULL;
-
- i = command->assignment_cnt;
- if (i != 0 && argv[i] == NULL) {
- /* assignments, but no command: set local environment */
- for (i = 0; argv[i] != NULL; i++) {
- debug_printf("local environment set: %s\n", argv[i]);
- p = expand_string_to_string(argv[i]);
- set_local_var(p, 0);
- }
- return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
- }
- /* Expand the rest into (possibly) many strings each */
- argv_expanded = expand_strvec_to_strvec(argv + i);
+/* expand_strvec_to_strvec() takes a list of strings, expands
+ * all variable references within and returns a pointer to
+ * a list of expanded strings, possibly with larger number
+ * of strings. (Think VAR="a b"; echo $VAR).
+ * This new list is allocated as a single malloc block.
+ * NULL-terminated list of char* pointers is at the beginning of it,
+ * followed by strings themself.
+ * Caller can deallocate entire list by single free(list). */
- for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
- if (strcmp(argv_expanded[0], x->cmd) != 0)
- continue;
- if (x->function == builtin_exec && argv_expanded[1] == NULL) {
- debug_printf("exec with redirects only\n");
- setup_redirects(command, NULL);
- rcode = EXIT_SUCCESS;
- goto clean_up_and_ret1;
- }
- debug_printf("builtin inline %s\n", argv_expanded[0]);
- /* XXX setup_redirects acts on file descriptors, not FILEs.
- * This is perfect for work that comes after exec().
- * Is it really safe for inline use? Experimentally,
- * things seem to work with glibc. */
- setup_redirects(command, squirrel);
- new_env = expand_assignments(argv, command->assignment_cnt);
- old_env = putenv_all_and_save_old(new_env);
- debug_printf_exec(": builtin '%s' '%s'...\n", x->cmd, argv_expanded[1]);
- rcode = x->function(argv_expanded) & 0xff;
-#if ENABLE_FEATURE_SH_STANDALONE
- clean_up_and_ret:
-#endif
- restore_redirects(squirrel);
- free_strings_and_unsetenv(new_env, 1);
- putenv_all(old_env);
- free(old_env); /* not free_strings()! */
- clean_up_and_ret1:
- free(argv_expanded);
- IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
- debug_printf_exec("run_pipe return %d\n", rcode);
- return rcode;
- }
-#if ENABLE_FEATURE_SH_STANDALONE
- i = find_applet_by_name(argv_expanded[0]);
- if (i >= 0 && APPLET_IS_NOFORK(i)) {
- setup_redirects(command, squirrel);
- save_nofork_data(&G.nofork_save);
- new_env = expand_assignments(argv, command->assignment_cnt);
- old_env = putenv_all_and_save_old(new_env);
- debug_printf_exec(": run_nofork_applet '%s' '%s'...\n", argv_expanded[0], argv_expanded[1]);
- rcode = run_nofork_applet_prime(&G.nofork_save, i, argv_expanded);
- goto clean_up_and_ret;
+/* Store given string, finalizing the word and starting new one whenever
+ * we encounter IFS char(s). This is used for expanding variable values.
+ * End-of-string does NOT finalize word: think about 'echo -$VAR-' */
+static int expand_on_ifs(o_string *output, int n, const char *str)
+{
+ while (1) {
+ int word_len = strcspn(str, G.ifs);
+ if (word_len) {
+ if (output->o_quote || !output->o_glob)
+ o_addQstr(output, str, word_len);
+ else /* protect backslashes against globbing up :) */
+ o_addstr_duplicate_backslash(output, str, word_len);
+ str += word_len;
}
-#endif
+ if (!*str) /* EOL - do not finalize word */
+ break;
+ o_addchr(output, '\0');
+ debug_print_list("expand_on_ifs", output, n);
+ n = o_save_ptr(output, n);
+ str += strspn(str, G.ifs); /* skip ifs chars */
}
+ debug_print_list("expand_on_ifs[1]", output, n);
+ return n;
+}
- /* NB: argv_expanded may already be created, and that
- * might include `cmd` runs! Do not rerun it! We *must*
- * use argv_expanded if it's non-NULL */
-
- /* Disable job control signals for shell (parent) and
- * for initial child code after fork */
- set_jobctrl_sighandler(SIG_IGN);
+#if ENABLE_HUSH_TICK
+static int process_command_subs(o_string *dest,
+ struct in_str *input, const char *subst_end);
+#endif
- /* Going to fork a child per each pipe member */
- pi->alive_cmds = 0;
- nextin = 0;
+/* Expand all variable references in given string, adding words to list[]
+ * at n, n+1,... positions. Return updated n (so that list[n] is next one
+ * to be filled). This routine is extremely tricky: has to deal with
+ * variables/parameters with whitespace, $* and $@, and constructs like
+ * 'echo -$*-'. If you play here, you must run testsuite afterwards! */
+static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
+{
+ /* or_mask is either 0 (normal case) or 0x80
+ * (expansion of right-hand side of assignment == 1-element expand.
+ * It will also do no globbing, and thus we must not backslash-quote!) */
- for (i = 0; i < pi->num_cmds; i++) {
-#if !BB_MMU
- volatile nommu_save_t nommu_save;
- nommu_save.new_env = NULL;
- nommu_save.old_env = NULL;
- nommu_save.argv = NULL;
-#endif
- command = &(pi->cmds[i]);
- if (command->argv) {
- debug_printf_exec(": pipe member '%s' '%s'...\n", command->argv[0], command->argv[1]);
- } else
- debug_printf_exec(": pipe member with no argv\n");
+ char first_ch, ored_ch;
+ int i;
+ const char *val;
+ char *p;
- /* pipes are inserted between pairs of commands */
- pipefds[0] = 0;
- pipefds[1] = 1;
- if ((i + 1) < pi->num_cmds)
- xpipe(pipefds);
+ ored_ch = 0;
- command->pid = BB_MMU ? fork() : vfork();
- if (!command->pid) { /* child */
- if (ENABLE_HUSH_JOB)
- die_sleep = 0; /* let nofork's xfuncs die */
-#if ENABLE_HUSH_JOB
- /* Every child adds itself to new process group
- * with pgid == pid_of_first_child_in_pipe */
- if (G.run_list_level == 1 && G.interactive_fd) {
- pid_t pgrp;
- /* Don't do pgrp restore anymore on fatal signals */
- set_fatal_sighandler(SIG_DFL);
- pgrp = pi->pgrp;
- if (pgrp < 0) /* true for 1st process only */
- pgrp = getpid();
- if (setpgid(0, pgrp) == 0 && pi->followup != PIPE_BG) {
- /* We do it in *every* child, not just first,
- * to avoid races */
- tcsetpgrp(G.interactive_fd, pgrp);
- }
- }
-#endif
- xmove_fd(nextin, 0);
- xmove_fd(pipefds[1], 1); /* write end */
- if (pipefds[0] > 1)
- close(pipefds[0]); /* read end */
- /* Like bash, explicit redirects override pipes,
- * and the pipe fd is available for dup'ing. */
- setup_redirects(command, NULL);
+ debug_printf_expand("expand_vars_to_list: arg '%s'\n", arg);
+ debug_print_list("expand_vars_to_list", output, n);
+ n = o_save_ptr(output, n);
+ debug_print_list("expand_vars_to_list[0]", output, n);
- /* Restore default handlers just prior to exec */
- set_jobctrl_sighandler(SIG_DFL);
- set_misc_sighandler(SIG_DFL);
- signal(SIGCHLD, SIG_DFL);
- /* Stores to nommu_save list of env vars putenv'ed
- * (NOMMU, on MMU we don't need that) */
- /* cast away volatility... */
- pseudo_exec((nommu_save_t*) &nommu_save, command, argv_expanded);
- /* pseudo_exec() does not return */
- }
- /* parent */
-#if !BB_MMU
- /* Clean up after vforked child */
- free(nommu_save.argv);
- free_strings_and_unsetenv(nommu_save.new_env, 1);
- putenv_all(nommu_save.old_env);
-#endif
- free(argv_expanded);
- argv_expanded = NULL;
- if (command->pid < 0) { /* [v]fork failed */
- /* Clearly indicate, was it fork or vfork */
- bb_perror_msg(BB_MMU ? "fork" : "vfork");
- } else {
- pi->alive_cmds++;
-#if ENABLE_HUSH_JOB
- /* Second and next children need to know pid of first one */
- if (pi->pgrp < 0)
- pi->pgrp = command->pid;
+ while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) {
+#if ENABLE_HUSH_TICK
+ o_string subst_result = NULL_O_STRING;
#endif
- }
-
- if (i)
- close(nextin);
- if ((i + 1) < pi->num_cmds)
- close(pipefds[1]); /* write end */
- /* Pass read (output) pipe end to next iteration */
- nextin = pipefds[0];
- }
+ o_addstr(output, arg, p - arg);
+ debug_print_list("expand_vars_to_list[1]", output, n);
+ arg = ++p;
+ p = strchr(p, SPECIAL_VAR_SYMBOL);
- if (!pi->alive_cmds) {
- debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n");
- return 1;
+ first_ch = arg[0] | or_mask; /* forced to "quoted" if or_mask = 0x80 */
+ /* "$@" is special. Even if quoted, it can still
+ * expand to nothing (not even an empty string) */
+ if ((first_ch & 0x7f) != '@')
+ ored_ch |= first_ch;
+ val = NULL;
+ switch (first_ch & 0x7f) {
+ /* Highest bit in first_ch indicates that var is double-quoted */
+ case '$': /* pid */
+ val = utoa(G.root_pid);
+ break;
+ case '!': /* bg pid */
+ val = G.last_bg_pid ? utoa(G.last_bg_pid) : (char*)"";
+ break;
+ case '?': /* exitcode */
+ val = utoa(G.last_return_code);
+ break;
+ case '#': /* argc */
+ val = utoa(G.global_argc ? G.global_argc-1 : 0);
+ break;
+ case '*':
+ case '@':
+ i = 1;
+ if (!G.global_argv[i])
+ break;
+ ored_ch |= first_ch; /* do it for "$@" _now_, when we know it's not empty */
+ if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
+ smallint sv = output->o_quote;
+ /* unquoted var's contents should be globbed, so don't quote */
+ output->o_quote = 0;
+ while (G.global_argv[i]) {
+ n = expand_on_ifs(output, n, G.global_argv[i]);
+ debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1);
+ if (G.global_argv[i++][0] && G.global_argv[i]) {
+ /* this argv[] is not empty and not last:
+ * put terminating NUL, start new word */
+ o_addchr(output, '\0');
+ debug_print_list("expand_vars_to_list[2]", output, n);
+ n = o_save_ptr(output, n);
+ debug_print_list("expand_vars_to_list[3]", output, n);
+ }
+ }
+ output->o_quote = sv;
+ } else
+ /* If or_mask is nonzero, we handle assignment 'a=....$@.....'
+ * and in this case should treat it like '$*' - see 'else...' below */
+ if (first_ch == ('@'|0x80) && !or_mask) { /* quoted $@ */
+ while (1) {
+ o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i]));
+ if (++i >= G.global_argc)
+ break;
+ o_addchr(output, '\0');
+ debug_print_list("expand_vars_to_list[4]", output, n);
+ n = o_save_ptr(output, n);
+ }
+ } else { /* quoted $*: add as one word */
+ while (1) {
+ o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i]));
+ if (!G.global_argv[++i])
+ break;
+ if (G.ifs[0])
+ o_addchr(output, G.ifs[0]);
+ }
+ }
+ break;
+ case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */
+ /* "Empty variable", used to make "" etc to not disappear */
+ arg++;
+ ored_ch = 0x80;
+ break;
+#if ENABLE_HUSH_TICK
+ case '`': { /* <SPECIAL_VAR_SYMBOL>`cmd<SPECIAL_VAR_SYMBOL> */
+ struct in_str input;
+ *p = '\0';
+ arg++;
+//TODO: can we just stuff it into "output" directly?
+ debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch);
+ setup_string_in_str(&input, arg);
+ process_command_subs(&subst_result, &input, NULL);
+ debug_printf_subst("SUBST RES '%s'\n", subst_result.data);
+ val = subst_result.data;
+ goto store_val;
+ }
+#endif
+ default: /* <SPECIAL_VAR_SYMBOL>varname<SPECIAL_VAR_SYMBOL> */
+ *p = '\0';
+ arg[0] = first_ch & 0x7f;
+ if (isdigit(arg[0])) {
+ i = xatoi_u(arg);
+ if (i < G.global_argc)
+ val = G.global_argv[i];
+ /* else val remains NULL: $N with too big N */
+ } else
+ val = lookup_param(arg);
+ arg[0] = first_ch;
+#if ENABLE_HUSH_TICK
+ store_val:
+#endif
+ *p = SPECIAL_VAR_SYMBOL;
+ if (!(first_ch & 0x80)) { /* unquoted $VAR */
+ debug_printf_expand("unquoted '%s', output->o_quote:%d\n", val, output->o_quote);
+ if (val) {
+ /* unquoted var's contents should be globbed, so don't quote */
+ smallint sv = output->o_quote;
+ output->o_quote = 0;
+ n = expand_on_ifs(output, n, val);
+ val = NULL;
+ output->o_quote = sv;
+ }
+ } else { /* quoted $VAR, val will be appended below */
+ debug_printf_expand("quoted '%s', output->o_quote:%d\n", val, output->o_quote);
+ }
+ }
+ if (val) {
+ o_addQstr(output, val, strlen(val));
+ }
+
+#if ENABLE_HUSH_TICK
+ o_free(&subst_result);
+#endif
+ arg = ++p;
+ } /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */
+
+ if (arg[0]) {
+ debug_print_list("expand_vars_to_list[a]", output, n);
+ /* this part is literal, and it was already pre-quoted
+ * if needed (much earlier), do not use o_addQstr here! */
+ o_addstr(output, arg, strlen(arg) + 1);
+ debug_print_list("expand_vars_to_list[b]", output, n);
+ } else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */
+ && !(ored_ch & 0x80) /* and all vars were not quoted. */
+ ) {
+ n--;
+ /* allow to reuse list[n] later without re-growth */
+ output->has_empty_slot = 1;
+ } else {
+ o_addchr(output, '\0');
+ }
+ return n;
+}
+
+static char **expand_variables(char **argv, int or_mask)
+{
+ int n;
+ char **list;
+ char **v;
+ o_string output = NULL_O_STRING;
+
+ if (or_mask & 0x100) {
+ output.o_quote = 1; /* protect against globbing for "$var" */
+ /* (unquoted $var will temporarily switch it off) */
+ output.o_glob = 1;
+ }
+
+ n = 0;
+ v = argv;
+ while (*v) {
+ n = expand_vars_to_list(&output, n, *v, (char)or_mask);
+ v++;
+ }
+ debug_print_list("expand_variables", &output, n);
+
+ /* output.data (malloced in one block) gets returned in "list" */
+ list = o_finalize_list(&output, n);
+ debug_print_strings("expand_variables[1]", list);
+ return list;
+}
+
+static char **expand_strvec_to_strvec(char **argv)
+{
+ return expand_variables(argv, 0x100);
+}
+
+/* Used for expansion of right hand of assignments */
+/* NB: should NOT do globbing! "export v=/bin/c*; env | grep ^v=" outputs
+ * "v=/bin/c*" */
+static char *expand_string_to_string(const char *str)
+{
+ char *argv[2], **list;
+
+ argv[0] = (char*)str;
+ argv[1] = NULL;
+ list = expand_variables(argv, 0x80); /* 0x80: make one-element expansion */
+ if (HUSH_DEBUG)
+ if (!list[0] || list[1])
+ bb_error_msg_and_die("BUG in varexp2");
+ /* actually, just move string 2*sizeof(char*) bytes back */
+ overlapping_strcpy((char*)list, list[0]);
+ debug_printf_expand("string_to_string='%s'\n", (char*)list);
+ return (char*)list;
+}
+
+/* Used for "eval" builtin */
+static char* expand_strvec_to_string(char **argv)
+{
+ char **list;
+
+ list = expand_variables(argv, 0x80);
+ /* Convert all NULs to spaces */
+ if (list[0]) {
+ int n = 1;
+ while (list[n]) {
+ if (HUSH_DEBUG)
+ if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
+ bb_error_msg_and_die("BUG in varexp3");
+ list[n][-1] = ' '; /* TODO: or to G.ifs[0]? */
+ n++;
+ }
+ }
+ overlapping_strcpy((char*)list, list[0]);
+ debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
+ return (char*)list;
+}
+
+static char **expand_assignments(char **argv, int count)
+{
+ int i;
+ char **p = NULL;
+ /* Expand assignments into one string each */
+ for (i = 0; i < count; i++) {
+ p = add_string_to_strings(p, expand_string_to_string(argv[i]));
+ }
+ return p;
+}
+
+
+/* squirrel != NULL means we squirrel away copies of stdin, stdout,
+ * and stderr if they are redirected. */
+static int setup_redirects(struct command *prog, int squirrel[])
+{
+ int openfd, mode;
+ struct redir_struct *redir;
+
+ for (redir = prog->redirects; redir; redir = redir->next) {
+ if (redir->dup == -1 && redir->rd_filename == NULL) {
+ /* something went wrong in the parse. Pretend it didn't happen */
+ continue;
+ }
+ if (redir->dup == -1) {
+ char *p;
+ mode = redir_table[redir->rd_type].mode;
+//TODO: check redir for names like '\\'
+ p = expand_string_to_string(redir->rd_filename);
+ openfd = open_or_warn(p, mode);
+ free(p);
+ if (openfd < 0) {
+ /* this could get lost if stderr has been redirected, but
+ bash and ash both lose it as well (though zsh doesn't!) */
+ return 1;
+ }
+ } else {
+ openfd = redir->dup;
+ }
+
+ if (openfd != redir->fd) {
+ if (squirrel && redir->fd < 3) {
+ squirrel[redir->fd] = dup(redir->fd);
+ }
+ if (openfd == -3) {
+ //close(openfd); // close(-3) ??!
+ } else {
+ dup2(openfd, redir->fd);
+ if (redir->dup == -1)
+ close(openfd);
+ }
+ }
+ }
+ return 0;
+}
+
+static void restore_redirects(int squirrel[])
+{
+ int i, fd;
+ for (i = 0; i < 3; i++) {
+ fd = squirrel[i];
+ if (fd != -1) {
+ /* We simply die on error */
+ xmove_fd(fd, i);
+ }
}
-
- debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->alive_cmds);
- return -1;
}
-#ifndef debug_print_tree
-static void debug_print_tree(struct pipe *pi, int lvl)
+
+#if !defined(DEBUG_CLEAN)
+#define free_pipe_list(head, indent) free_pipe_list(head)
+#define free_pipe(pi, indent) free_pipe(pi)
+#endif
+static int free_pipe_list(struct pipe *head, int indent);
+
+/* return code is the exit status of the pipe */
+static int free_pipe(struct pipe *pi, int indent)
{
- static const char *const PIPE[] = {
- [PIPE_SEQ] = "SEQ",
- [PIPE_AND] = "AND",
- [PIPE_OR ] = "OR" ,
- [PIPE_BG ] = "BG" ,
- };
- static const char *RES[] = {
- [RES_NONE ] = "NONE" ,
-#if ENABLE_HUSH_IF
- [RES_IF ] = "IF" ,
- [RES_THEN ] = "THEN" ,
- [RES_ELIF ] = "ELIF" ,
- [RES_ELSE ] = "ELSE" ,
- [RES_FI ] = "FI" ,
+ char **p;
+ struct command *command;
+ struct redir_struct *r, *rnext;
+ int a, i, ret_code = 0;
+
+ if (pi->stopped_cmds > 0)
+ return ret_code;
+ debug_printf_clean("%s run pipe: (pid %d)\n", indenter(indent), getpid());
+ for (i = 0; i < pi->num_cmds; i++) {
+ command = &pi->cmds[i];
+ debug_printf_clean("%s command %d:\n", indenter(indent), i);
+ if (command->argv) {
+ for (a = 0, p = command->argv; *p; a++, p++) {
+ debug_printf_clean("%s argv[%d] = %s\n", indenter(indent), a, *p);
+ }
+ free_strings(command->argv);
+ command->argv = NULL;
+ } else if (command->group) {
+ debug_printf_clean("%s begin group (grp_type:%d)\n", indenter(indent), command->grp_type);
+ ret_code = free_pipe_list(command->group, indent+3);
+ debug_printf_clean("%s end group\n", indenter(indent));
+ } else {
+ debug_printf_clean("%s (nil)\n", indenter(indent));
+ }
+ for (r = command->redirects; r; r = rnext) {
+ debug_printf_clean("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->rd_type].descrip);
+ if (r->dup == -1) {
+ /* guard against the case >$FOO, where foo is unset or blank */
+ if (r->rd_filename) {
+ debug_printf_clean(" %s\n", r->rd_filename);
+ free(r->rd_filename);
+ r->rd_filename = NULL;
+ }
+ } else {
+ debug_printf_clean("&%d\n", r->dup);
+ }
+ rnext = r->next;
+ free(r);
+ }
+ command->redirects = NULL;
+ }
+ free(pi->cmds); /* children are an array, they get freed all at once */
+ pi->cmds = NULL;
+#if ENABLE_HUSH_JOB
+ free(pi->cmdtext);
+ pi->cmdtext = NULL;
#endif
-#if ENABLE_HUSH_LOOPS
- [RES_FOR ] = "FOR" ,
- [RES_WHILE] = "WHILE",
- [RES_UNTIL] = "UNTIL",
- [RES_DO ] = "DO" ,
- [RES_DONE ] = "DONE" ,
+ return ret_code;
+}
+
+static int free_pipe_list(struct pipe *head, int indent)
+{
+ int rcode = 0; /* if list has no members */
+ struct pipe *pi, *next;
+
+ for (pi = head; pi; pi = next) {
+#if HAS_KEYWORDS
+ debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->res_word);
#endif
-#if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
- [RES_IN ] = "IN" ,
+ rcode = free_pipe(pi, indent);
+ debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup);
+ next = pi->next;
+ /*pi->next = NULL;*/
+ free(pi);
+ }
+ return rcode;
+}
+
+
+#if !BB_MMU
+typedef struct nommu_save_t {
+ char **new_env;
+ char **old_env;
+ char **argv;
+} nommu_save_t;
+#else
+#define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \
+ pseudo_exec_argv(argv, assignment_cnt, argv_expanded)
+#define pseudo_exec(nommu_save, command, argv_expanded) \
+ pseudo_exec(command, argv_expanded)
#endif
-#if ENABLE_HUSH_CASE
- [RES_CASE ] = "CASE" ,
- [RES_MATCH] = "MATCH",
- [RES_CASEI] = "CASEI",
- [RES_ESAC ] = "ESAC" ,
+
+/* Called after [v]fork() in run_pipe(), or from builtin_exec().
+ * Never returns.
+ * XXX no exit() here. If you don't exec, use _exit instead.
+ * The at_exit handlers apparently confuse the calling process,
+ * in particular stdin handling. Not sure why? -- because of vfork! (vda) */
+static void pseudo_exec_argv(nommu_save_t *nommu_save, char **argv, int assignment_cnt, char **argv_expanded) NORETURN;
+static void pseudo_exec_argv(nommu_save_t *nommu_save, char **argv, int assignment_cnt, char **argv_expanded)
+{
+ int rcode;
+ char **new_env;
+ const struct built_in_command *x;
+
+ /* If a variable is assigned in a forest, and nobody listens,
+ * was it ever really set?
+ */
+ if (!argv[assignment_cnt])
+ _exit(EXIT_SUCCESS);
+
+ new_env = expand_assignments(argv, assignment_cnt);
+#if BB_MMU
+ putenv_all(new_env);
+ free(new_env); /* optional */
+#else
+ nommu_save->new_env = new_env;
+ nommu_save->old_env = putenv_all_and_save_old(new_env);
#endif
- [RES_XXXX ] = "XXXX" ,
- [RES_SNTX ] = "SNTX" ,
- };
- static const char *const GRPTYPE[] = {
- "()",
- "{}",
-#if ENABLE_HUSH_FUNCTIONS
- "func()",
+ if (argv_expanded) {
+ argv = argv_expanded;
+ } else {
+ argv = expand_strvec_to_strvec(argv);
+#if !BB_MMU
+ nommu_save->argv = argv;
#endif
- };
-
- int pin, prn;
+ }
- pin = 0;
- while (pi) {
- fprintf(stderr, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "",
- pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]);
- prn = 0;
- while (prn < pi->num_cmds) {
- struct command *command = &pi->cmds[prn];
- char **argv = command->argv;
+ /*
+ * Check if the command matches any of the builtins.
+ * Depending on context, this might be redundant. But it's
+ * easier to waste a few CPU cycles than it is to figure out
+ * if this is one of those cases.
+ */
+ for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
+ if (strcmp(argv[0], x->cmd) == 0) {
+ debug_printf_exec("running builtin '%s'\n", argv[0]);
+ rcode = x->function(argv);
+ fflush(stdout);
+ _exit(rcode);
+ }
+ }
- fprintf(stderr, "%*s prog %d assignment_cnt:%d", lvl*2, "", prn, command->assignment_cnt);
- if (command->group) {
- fprintf(stderr, " group %s: (argv=%p)\n",
- GRPTYPE[command->grp_type],
- argv);
- debug_print_tree(command->group, lvl+1);
- prn++;
- continue;
- }
- if (argv) while (*argv) {
- fprintf(stderr, " '%s'", *argv);
- argv++;
+ /* Check if the command matches any busybox applets */
+#if ENABLE_FEATURE_SH_STANDALONE
+ if (strchr(argv[0], '/') == NULL) {
+ int a = find_applet_by_name(argv[0]);
+ if (a >= 0) {
+ if (APPLET_IS_NOEXEC(a)) {
+ debug_printf_exec("running applet '%s'\n", argv[0]);
+// is it ok that run_applet_no_and_exit() does exit(), not _exit()?
+ run_applet_no_and_exit(a, argv);
}
- fprintf(stderr, "\n");
- prn++;
+ /* re-exec ourselves with the new arguments */
+ debug_printf_exec("re-execing applet '%s'\n", argv[0]);
+ execvp(bb_busybox_exec_path, argv);
+ /* If they called chroot or otherwise made the binary no longer
+ * executable, fall through */
}
- pi = pi->next;
- pin++;
}
+#endif
+
+ debug_printf_exec("execing '%s'\n", argv[0]);
+ execvp(argv[0], argv);
+ bb_perror_msg("can't exec '%s'", argv[0]);
+ _exit(EXIT_FAILURE);
+}
+
+static int run_list(struct pipe *pi);
+
+/* Called after [v]fork() in run_pipe()
+ */
+static void pseudo_exec(nommu_save_t *nommu_save, struct command *command, char **argv_expanded) NORETURN;
+static void pseudo_exec(nommu_save_t *nommu_save, struct command *command, char **argv_expanded)
+{
+ if (command->argv)
+ pseudo_exec_argv(nommu_save, command->argv, command->assignment_cnt, argv_expanded);
+
+ if (command->group) {
+#if !BB_MMU
+ bb_error_msg_and_die("nested lists are not supported on NOMMU");
+#else
+ int rcode;
+ debug_printf_exec("pseudo_exec: run_list\n");
+ rcode = run_list(command->group);
+ /* OK to leak memory by not calling free_pipe_list,
+ * since this process is about to exit */
+ _exit(rcode);
+#endif
+ }
+
+ /* Can happen. See what bash does with ">foo" by itself. */
+ debug_printf("trying to pseudo_exec null command\n");
+ _exit(EXIT_SUCCESS);
+}
+
+#if ENABLE_HUSH_JOB
+static const char *get_cmdtext(struct pipe *pi)
+{
+ char **argv;
+ char *p;
+ int len;
+
+ /* This is subtle. ->cmdtext is created only on first backgrounding.
+ * (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...)
+ * On subsequent bg argv is trashed, but we won't use it */
+ if (pi->cmdtext)
+ return pi->cmdtext;
+ argv = pi->cmds[0].argv;
+ if (!argv || !argv[0]) {
+ pi->cmdtext = xzalloc(1);
+ return pi->cmdtext;
+ }
+
+ len = 0;
+ do len += strlen(*argv) + 1; while (*++argv);
+ pi->cmdtext = p = xmalloc(len);
+ argv = pi->cmds[0].argv;
+ do {
+ len = strlen(*argv);
+ memcpy(p, *argv, len);
+ p += len;
+ *p++ = ' ';
+ } while (*++argv);
+ p[-1] = '\0';
+ return pi->cmdtext;
}
-#endif
-/* NB: called by pseudo_exec, and therefore must not modify any
- * global data until exec/_exit (we can be a child after vfork!) */
-static int run_list(struct pipe *pi)
+static void insert_bg_job(struct pipe *pi)
{
-#if ENABLE_HUSH_CASE
- char *case_word = NULL;
-#endif
-#if ENABLE_HUSH_LOOPS
- struct pipe *loop_top = NULL;
- char *for_varname = NULL;
- char **for_lcur = NULL;
- char **for_list = NULL;
-#endif
- smallint flag_skip = 1;
- smalluint rcode = 0; /* probably just for compiler */
-#if ENABLE_HUSH_IF || ENABLE_HUSH_CASE
- smalluint cond_code = 0;
-#else
- enum { cond_code = 0, };
-#endif
- /*enum reserved_style*/ smallint rword = RES_NONE;
- /*enum reserved_style*/ smallint skip_more_for_this_rword = RES_XXXX;
+ struct pipe *thejob;
+ int i;
- debug_printf_exec("run_list start lvl %d\n", G.run_list_level + 1);
+ /* Linear search for the ID of the job to use */
+ pi->jobid = 1;
+ for (thejob = G.job_list; thejob; thejob = thejob->next)
+ if (thejob->jobid >= pi->jobid)
+ pi->jobid = thejob->jobid + 1;
-#if ENABLE_HUSH_LOOPS
- /* Check syntax for "for" */
- for (struct pipe *cpipe = pi; cpipe; cpipe = cpipe->next) {
- if (cpipe->res_word != RES_FOR && cpipe->res_word != RES_IN)
- continue;
- /* current word is FOR or IN (BOLD in comments below) */
- if (cpipe->next == NULL) {
- syntax("malformed for");
- debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
- return 1;
- }
- /* "FOR v; do ..." and "for v IN a b; do..." are ok */
- if (cpipe->next->res_word == RES_DO)
+ /* Add thejob to the list of running jobs */
+ if (!G.job_list) {
+ thejob = G.job_list = xmalloc(sizeof(*thejob));
+ } else {
+ for (thejob = G.job_list; thejob->next; thejob = thejob->next)
continue;
- /* next word is not "do". It must be "in" then ("FOR v in ...") */
- if (cpipe->res_word == RES_IN /* "for v IN a b; not_do..."? */
- || cpipe->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */
- ) {
- syntax("malformed for");
- debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
- return 1;
- }
+ thejob->next = xmalloc(sizeof(*thejob));
+ thejob = thejob->next;
}
-#endif
-
- /* Past this point, all code paths should jump to ret: label
- * in order to return, no direct "return" statements please.
- * This helps to ensure that no memory is leaked. */
-#if ENABLE_HUSH_JOB
- /* Example of nested list: "while true; do { sleep 1 | exit 2; } done".
- * We are saving state before entering outermost list ("while...done")
- * so that ctrl-Z will correctly background _entire_ outermost list,
- * not just a part of it (like "sleep 1 | exit 2") */
- if (++G.run_list_level == 1 && G.interactive_fd) {
- if (sigsetjmp(G.toplevel_jb, 1)) {
- /* ctrl-Z forked and we are parent; or ctrl-C.
- * Sighandler has longjmped us here */
- signal(SIGINT, SIG_IGN);
- signal(SIGTSTP, SIG_IGN);
- /* Restore level (we can be coming from deep inside
- * nested levels) */
- G.run_list_level = 1;
-#if ENABLE_FEATURE_SH_STANDALONE
- if (G.nofork_save.saved) { /* if save area is valid */
- debug_printf_jobs("exiting nofork early\n");
- restore_nofork_data(&G.nofork_save);
- }
-#endif
- if (G.ctrl_z_flag) {
- /* ctrl-Z has forked and stored pid of the child in pi->pid.
- * Remember this child as background job */
- insert_bg_job(pi);
- } else {
- /* ctrl-C. We just stop doing whatever we were doing */
- bb_putchar('\n');
- }
- USE_HUSH_LOOPS(loop_top = NULL;)
- USE_HUSH_LOOPS(G.depth_of_loop = 0;)
- rcode = 0;
- goto ret;
- }
- /* ctrl-Z handler will store pid etc in pi */
- G.toplevel_list = pi;
- G.ctrl_z_flag = 0;
-#if ENABLE_FEATURE_SH_STANDALONE
- G.nofork_save.saved = 0; /* in case we will run a nofork later */
-#endif
- signal_SA_RESTART_empty_mask(SIGTSTP, handler_ctrl_z);
- signal(SIGINT, handler_ctrl_c);
+ /* Physically copy the struct job */
+ memcpy(thejob, pi, sizeof(struct pipe));
+ thejob->cmds = xzalloc(sizeof(pi->cmds[0]) * pi->num_cmds);
+ /* We cannot copy entire pi->cmds[] vector! Double free()s will happen */
+ for (i = 0; i < pi->num_cmds; i++) {
+// TODO: do we really need to have so many fields which are just dead weight
+// at execution stage?
+ thejob->cmds[i].pid = pi->cmds[i].pid;
+ /* all other fields are not used and stay zero */
}
-#endif /* JOB */
+ thejob->next = NULL;
+ thejob->cmdtext = xstrdup(get_cmdtext(pi));
- /* Go through list of pipes, (maybe) executing them. */
- for (; pi; pi = USE_HUSH_LOOPS(rword == RES_DONE ? loop_top : ) pi->next) {
- IF_HAS_KEYWORDS(rword = pi->res_word;)
- IF_HAS_NO_KEYWORDS(rword = RES_NONE;)
- debug_printf_exec(": rword=%d cond_code=%d skip_more=%d\n",
- rword, cond_code, skip_more_for_this_rword);
-#if ENABLE_HUSH_LOOPS
- if ((rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR)
- && loop_top == NULL /* avoid bumping G.depth_of_loop twice */
- ) {
- /* start of a loop: remember where loop starts */
- loop_top = pi;
- G.depth_of_loop++;
- }
-#endif
- if (rword == skip_more_for_this_rword && flag_skip) {
- if (pi->followup == PIPE_SEQ)
- flag_skip = 0;
- /* it is "<false> && CMD" or "<true> || CMD"
- * and we should not execute CMD */
- continue;
- }
- flag_skip = 1;
- skip_more_for_this_rword = RES_XXXX;
-#if ENABLE_HUSH_IF
- if (cond_code) {
- if (rword == RES_THEN) {
- /* "if <false> THEN cmd": skip cmd */
- continue;
- }
- } else {
- if (rword == RES_ELSE || rword == RES_ELIF) {
- /* "if <true> then ... ELSE/ELIF cmd":
- * skip cmd and all following ones */
- break;
- }
- }
-#endif
-#if ENABLE_HUSH_LOOPS
- if (rword == RES_FOR) { /* && pi->num_cmds - always == 1 */
- if (!for_lcur) {
- /* first loop through for */
+ /* We don't wait for background thejobs to return -- append it
+ to the list of backgrounded thejobs and leave it alone */
+ printf("[%d] %d %s\n", thejob->jobid, thejob->cmds[0].pid, thejob->cmdtext);
+ G.last_bg_pid = thejob->cmds[0].pid;
+ G.last_jobid = thejob->jobid;
+}
- static const char encoded_dollar_at[] ALIGN1 = {
- SPECIAL_VAR_SYMBOL, '@' | 0x80, SPECIAL_VAR_SYMBOL, '\0'
- }; /* encoded representation of "$@" */
- static const char *const encoded_dollar_at_argv[] = {
- encoded_dollar_at, NULL
- }; /* argv list with one element: "$@" */
- char **vals;
+static void remove_bg_job(struct pipe *pi)
+{
+ struct pipe *prev_pipe;
- vals = (char**)encoded_dollar_at_argv;
- if (pi->next->res_word == RES_IN) {
- /* if no variable values after "in" we skip "for" */
- if (!pi->next->cmds[0].argv)
- break;
- vals = pi->next->cmds[0].argv;
- } /* else: "for var; do..." -> assume "$@" list */
- /* create list of variable values */
- debug_print_strings("for_list made from", vals);
- for_list = expand_strvec_to_strvec(vals);
- for_lcur = for_list;
- debug_print_strings("for_list", for_list);
- for_varname = pi->cmds[0].argv[0];
- pi->cmds[0].argv[0] = NULL;
- }
- free(pi->cmds[0].argv[0]);
- if (!*for_lcur) {
- /* "for" loop is over, clean up */
- free(for_list);
- for_list = NULL;
- for_lcur = NULL;
- pi->cmds[0].argv[0] = for_varname;
- break;
- }
- /* insert next value from for_lcur */
-//TODO: does it need escaping?
- pi->cmds[0].argv[0] = xasprintf("%s=%s", for_varname, *for_lcur++);
- pi->cmds[0].assignment_cnt = 1;
- }
- if (rword == RES_IN) /* "for v IN list;..." - "in" has no cmds anyway */
- continue;
- if (rword == RES_DONE) {
- continue; /* "done" has no cmds too */
- }
-#endif
-#if ENABLE_HUSH_CASE
- if (rword == RES_CASE) {
- case_word = expand_strvec_to_string(pi->cmds->argv);
- continue;
- }
- if (rword == RES_MATCH) {
- char **argv;
+ if (pi == G.job_list) {
+ G.job_list = pi->next;
+ } else {
+ prev_pipe = G.job_list;
+ while (prev_pipe->next != pi)
+ prev_pipe = prev_pipe->next;
+ prev_pipe->next = pi->next;
+ }
+ if (G.job_list)
+ G.last_jobid = G.job_list->jobid;
+ else
+ G.last_jobid = 0;
+}
- if (!case_word) /* "case ... matched_word) ... WORD)": we executed selected branch, stop */
- break;
- /* all prev words didn't match, does this one match? */
- argv = pi->cmds->argv;
- while (*argv) {
- char *pattern = expand_string_to_string(*argv);
- /* TODO: which FNM_xxx flags to use? */
- cond_code = (fnmatch(pattern, case_word, /*flags:*/ 0) != 0);
- free(pattern);
- if (cond_code == 0) { /* match! we will execute this branch */
- free(case_word); /* make future "word)" stop */
- case_word = NULL;
- break;
- }
- argv++;
- }
- continue;
- }
- if (rword == RES_CASEI) { /* inside of a case branch */
- if (cond_code != 0)
- continue; /* not matched yet, skip this pipe */
- }
+/* Remove a backgrounded job */
+static void delete_finished_bg_job(struct pipe *pi)
+{
+ remove_bg_job(pi);
+ pi->stopped_cmds = 0;
+ free_pipe(pi, 0);
+ free(pi);
+}
+#endif /* JOB */
+
+/* Check to see if any processes have exited -- if they
+ * have, figure out why and see if a job has completed */
+static int checkjobs(struct pipe* fg_pipe)
+{
+ int attributes;
+ int status;
+#if ENABLE_HUSH_JOB
+ struct pipe *pi;
#endif
- if (pi->num_cmds == 0)
- continue;
+ pid_t childpid;
+ int rcode = 0;
- /* After analyzing all keywords and conditions, we decided
- * to execute this pipe. NB: has to do checkjobs(NULL)
- * after run_pipe() to collect any background children,
- * even if list execution is to be stopped. */
- debug_printf_exec(": run_pipe with %d members\n", pi->num_cmds);
- {
- int r;
-#if ENABLE_HUSH_LOOPS
- G.flag_break_continue = 0;
+ attributes = WUNTRACED;
+ if (fg_pipe == NULL)
+ attributes |= WNOHANG;
+
+/* Do we do this right?
+ * bash-3.00# sleep 20 | false
+ * <ctrl-Z pressed>
+ * [3]+ Stopped sleep 20 | false
+ * bash-3.00# echo $?
+ * 1 <========== bg pipe is not fully done, but exitcode is already known!
+ */
+
+//FIXME: non-interactive bash does not continue even if all processes in fg pipe
+//are stopped. Testcase: "cat | cat" in a script (not on command line)
+// + killall -STOP cat
+
+ wait_more:
+// TODO: safe_waitpid?
+ while ((childpid = waitpid(-1, &status, attributes)) > 0) {
+ int i;
+ const int dead = WIFEXITED(status) || WIFSIGNALED(status);
+#if DEBUG_JOBS
+ if (WIFSTOPPED(status))
+ debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
+ childpid, WSTOPSIG(status), WEXITSTATUS(status));
+ if (WIFSIGNALED(status))
+ debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n",
+ childpid, WTERMSIG(status), WEXITSTATUS(status));
+ if (WIFEXITED(status))
+ debug_printf_jobs("pid %d exited, exitcode %d\n",
+ childpid, WEXITSTATUS(status));
#endif
- rcode = r = run_pipe(pi); /* NB: rcode is a smallint */
- if (r != -1) {
- /* we only ran a builtin: rcode is already known
- * and we don't need to wait for anything. */
-#if ENABLE_HUSH_LOOPS
- /* was it "break" or "continue"? */
- if (G.flag_break_continue) {
- smallint fbc = G.flag_break_continue;
- /* we might fall into outer *loop*,
- * don't want to break it too */
- if (loop_top) {
- G.depth_break_continue--;
- if (G.depth_break_continue == 0)
- G.flag_break_continue = 0;
- /* else: e.g. "continue 2" should *break* once, *then* continue */
- } /* else: "while... do... { we are here (innermost list is not a loop!) };...done" */
- if (G.depth_break_continue != 0 || fbc == BC_BREAK)
- goto check_jobs_and_break;
- /* "continue": simulate end of loop */
- rword = RES_DONE;
+ /* Were we asked to wait for fg pipe? */
+ if (fg_pipe) {
+ for (i = 0; i < fg_pipe->num_cmds; i++) {
+ debug_printf_jobs("check pid %d\n", fg_pipe->cmds[i].pid);
+ if (fg_pipe->cmds[i].pid != childpid)
continue;
+ /* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */
+ if (dead) {
+ fg_pipe->cmds[i].pid = 0;
+ fg_pipe->alive_cmds--;
+ if (i == fg_pipe->num_cmds - 1) {
+ /* last process gives overall exitstatus */
+ rcode = WEXITSTATUS(status);
+ IF_HAS_KEYWORDS(if (fg_pipe->pi_inverted) rcode = !rcode;)
+ }
+ } else {
+ fg_pipe->cmds[i].is_stopped = 1;
+ fg_pipe->stopped_cmds++;
}
-#endif
- } else if (pi->followup == PIPE_BG) {
- /* what does bash do with attempts to background builtins? */
- /* even bash 3.2 doesn't do that well with nested bg:
- * try "{ { sleep 10; echo DEEP; } & echo HERE; } &".
- * I'm NOT treating inner &'s as jobs */
-#if ENABLE_HUSH_JOB
- if (G.run_list_level == 1)
- insert_bg_job(pi);
-#endif
- rcode = 0; /* EXIT_SUCCESS */
- } else {
+ debug_printf_jobs("fg_pipe: alive_cmds %d stopped_cmds %d\n",
+ fg_pipe->alive_cmds, fg_pipe->stopped_cmds);
+ if (fg_pipe->alive_cmds - fg_pipe->stopped_cmds <= 0) {
+ /* All processes in fg pipe have exited/stopped */
#if ENABLE_HUSH_JOB
- if (G.run_list_level == 1 && G.interactive_fd) {
- /* waits for completion, then fg's main shell */
- rcode = checkjobs_and_fg_shell(pi);
- debug_printf_exec(": checkjobs_and_fg_shell returned %d\n", rcode);
- } else
+ if (fg_pipe->alive_cmds)
+ insert_bg_job(fg_pipe);
#endif
- { /* this one just waits for completion */
- rcode = checkjobs(pi);
- debug_printf_exec(": checkjobs returned %d\n", rcode);
+ return rcode;
}
+ /* There are still running processes in the fg pipe */
+ goto wait_more; /* do waitpid again */
}
+ /* it wasnt fg_pipe, look for process in bg pipes */
}
- debug_printf_exec(": setting last_return_code=%d\n", rcode);
- G.last_return_code = rcode;
-
- /* Analyze how result affects subsequent commands */
-#if ENABLE_HUSH_IF
- if (rword == RES_IF || rword == RES_ELIF)
- cond_code = rcode;
-#endif
-#if ENABLE_HUSH_LOOPS
- if (rword == RES_WHILE) {
- if (rcode) {
- rcode = 0; /* "while false; do...done" - exitcode 0 */
- goto check_jobs_and_break;
- }
- }
- if (rword == RES_UNTIL) {
- if (!rcode) {
- check_jobs_and_break:
- checkjobs(NULL);
- break;
- }
- }
-#endif
- if ((rcode == 0 && pi->followup == PIPE_OR)
- || (rcode != 0 && pi->followup == PIPE_AND)
- ) {
- skip_more_for_this_rword = rword;
- }
- checkjobs(NULL);
- } /* for (pi) */
#if ENABLE_HUSH_JOB
- if (G.ctrl_z_flag) {
- /* ctrl-Z forked somewhere in the past, we are the child,
- * and now we completed running the list. Exit. */
-//TODO: _exit?
- exit(rcode);
- }
- ret:
- if (!--G.run_list_level && G.interactive_fd) {
- signal(SIGTSTP, SIG_IGN);
- signal(SIGINT, SIG_IGN);
- }
-#endif
- debug_printf_exec("run_list lvl %d return %d\n", G.run_list_level + 1, rcode);
-#if ENABLE_HUSH_LOOPS
- if (loop_top)
- G.depth_of_loop--;
- free(for_list);
-#endif
-#if ENABLE_HUSH_CASE
- free(case_word);
-#endif
- return rcode;
-}
-
-/* return code is the exit status of the pipe */
-static int free_pipe(struct pipe *pi, int indent)
-{
- char **p;
- struct command *command;
- struct redir_struct *r, *rnext;
- int a, i, ret_code = 0;
-
- if (pi->stopped_cmds > 0)
- return ret_code;
- debug_printf_clean("%s run pipe: (pid %d)\n", indenter(indent), getpid());
- for (i = 0; i < pi->num_cmds; i++) {
- command = &pi->cmds[i];
- debug_printf_clean("%s command %d:\n", indenter(indent), i);
- if (command->argv) {
- for (a = 0, p = command->argv; *p; a++, p++) {
- debug_printf_clean("%s argv[%d] = %s\n", indenter(indent), a, *p);
+ /* We asked to wait for bg or orphaned children */
+ /* No need to remember exitcode in this case */
+ for (pi = G.job_list; pi; pi = pi->next) {
+ for (i = 0; i < pi->num_cmds; i++) {
+ if (pi->cmds[i].pid == childpid)
+ goto found_pi_and_prognum;
}
- free_strings(command->argv);
- command->argv = NULL;
- } else if (command->group) {
- debug_printf_clean("%s begin group (grp_type:%d)\n", indenter(indent), command->grp_type);
- ret_code = free_pipe_list(command->group, indent+3);
- debug_printf_clean("%s end group\n", indenter(indent));
- } else {
- debug_printf_clean("%s (nil)\n", indenter(indent));
}
- for (r = command->redirects; r; r = rnext) {
- debug_printf_clean("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->rd_type].descrip);
- if (r->dup == -1) {
- /* guard against the case >$FOO, where foo is unset or blank */
- if (r->rd_filename) {
- debug_printf_clean(" %s\n", r->rd_filename);
- free(r->rd_filename);
- r->rd_filename = NULL;
- }
- } else {
- debug_printf_clean("&%d\n", r->dup);
+ /* Happens when shell is used as init process (init=/bin/sh) */
+ debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
+ continue; /* do waitpid again */
+
+ found_pi_and_prognum:
+ if (dead) {
+ /* child exited */
+ pi->cmds[i].pid = 0;
+ pi->alive_cmds--;
+ if (!pi->alive_cmds) {
+ printf(JOB_STATUS_FORMAT, pi->jobid,
+ "Done", pi->cmdtext);
+ delete_finished_bg_job(pi);
}
- rnext = r->next;
- free(r);
+ } else {
+ /* child stopped */
+ pi->cmds[i].is_stopped = 1;
+ pi->stopped_cmds++;
}
- command->redirects = NULL;
- }
- free(pi->cmds); /* children are an array, they get freed all at once */
- pi->cmds = NULL;
-#if ENABLE_HUSH_JOB
- free(pi->cmdtext);
- pi->cmdtext = NULL;
#endif
- return ret_code;
-}
+ } /* while (waitpid succeeds)... */
-static int free_pipe_list(struct pipe *head, int indent)
-{
- int rcode = 0; /* if list has no members */
- struct pipe *pi, *next;
+ /* wait found no children or failed */
- for (pi = head; pi; pi = next) {
-#if HAS_KEYWORDS
- debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->res_word);
-#endif
- rcode = free_pipe(pi, indent);
- debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup);
- next = pi->next;
- /*pi->next = NULL;*/
- free(pi);
- }
+ if (childpid && errno != ECHILD)
+ bb_perror_msg("waitpid");
return rcode;
}
-/* Select which version we will use */
-static int run_and_free_list(struct pipe *pi)
+#if ENABLE_HUSH_JOB
+static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
{
- int rcode = 0;
- debug_printf_exec("run_and_free_list entered\n");
- if (!G.fake_mode) {
- debug_printf_exec(": run_list with %d members\n", pi->num_cmds);
- rcode = run_list(pi);
- }
- /* free_pipe_list has the side effect of clearing memory.
- * In the long run that function can be merged with run_list,
- * but doing that now would hobble the debugging effort. */
- free_pipe_list(pi, /* indent: */ 0);
- debug_printf_exec("run_and_free_list return %d\n", rcode);
+ pid_t p;
+ int rcode = checkjobs(fg_pipe);
+ /* Job finished, move the shell to the foreground */
+ p = getpgid(0); /* pgid of our process */
+ debug_printf_jobs("fg'ing ourself: getpgid(0)=%d\n", (int)p);
+ tcsetpgrp(G.interactive_fd, p);
return rcode;
}
+#endif
-
-/* expand_strvec_to_strvec() takes a list of strings, expands
- * all variable references within and returns a pointer to
- * a list of expanded strings, possibly with larger number
- * of strings. (Think VAR="a b"; echo $VAR).
- * This new list is allocated as a single malloc block.
- * NULL-terminated list of char* pointers is at the beginning of it,
- * followed by strings themself.
- * Caller can deallocate entire list by single free(list). */
-
-/* Store given string, finalizing the word and starting new one whenever
- * we encounter IFS char(s). This is used for expanding variable values.
- * End-of-string does NOT finalize word: think about 'echo -$VAR-' */
-static int expand_on_ifs(o_string *output, int n, const char *str)
-{
- while (1) {
- int word_len = strcspn(str, G.ifs);
- if (word_len) {
- if (output->o_quote || !output->o_glob)
- o_addQstr(output, str, word_len);
- else /* protect backslashes against globbing up :) */
- o_addstr_duplicate_backslash(output, str, word_len);
- str += word_len;
- }
- if (!*str) /* EOL - do not finalize word */
- break;
- o_addchr(output, '\0');
- debug_print_list("expand_on_ifs", output, n);
- n = o_save_ptr(output, n);
- str += strspn(str, G.ifs); /* skip ifs chars */
- }
- debug_print_list("expand_on_ifs[1]", output, n);
- return n;
-}
-
-/* Expand all variable references in given string, adding words to list[]
- * at n, n+1,... positions. Return updated n (so that list[n] is next one
- * to be filled). This routine is extremely tricky: has to deal with
- * variables/parameters with whitespace, $* and $@, and constructs like
- * 'echo -$*-'. If you play here, you must run testsuite afterwards! */
-static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
+/* run_pipe() starts all the jobs, but doesn't wait for anything
+ * to finish. See checkjobs().
+ *
+ * return code is normally -1, when the caller has to wait for children
+ * to finish to determine the exit status of the pipe. If the pipe
+ * is a simple builtin command, however, the action is done by the
+ * time run_pipe returns, and the exit code is provided as the
+ * return value.
+ *
+ * The input of the pipe is always stdin, the output is always
+ * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
+ * because it tries to avoid running the command substitution in
+ * subshell, when that is in fact necessary. The subshell process
+ * now has its stdout directed to the input of the appropriate pipe,
+ * so this routine is noticeably simpler.
+ *
+ * Returns -1 only if started some children. IOW: we have to
+ * mask out retvals of builtins etc with 0xff!
+ */
+static int run_pipe(struct pipe *pi)
{
- /* or_mask is either 0 (normal case) or 0x80
- * (expansion of right-hand side of assignment == 1-element expand.
- * It will also do no globbing, and thus we must not backslash-quote!) */
-
- char first_ch, ored_ch;
int i;
- const char *val;
+ int nextin;
+ int pipefds[2]; /* pipefds[0] is for reading */
+ struct command *command;
+ char **argv_expanded;
+ char **argv;
+ const struct built_in_command *x;
char *p;
+ /* it is not always needed, but we aim to smaller code */
+ int squirrel[] = { -1, -1, -1 };
+ int rcode;
+ const int single_and_fg = (pi->num_cmds == 1 && pi->followup != PIPE_BG);
- ored_ch = 0;
+ debug_printf_exec("run_pipe start: single_and_fg=%d\n", single_and_fg);
- debug_printf_expand("expand_vars_to_list: arg '%s'\n", arg);
- debug_print_list("expand_vars_to_list", output, n);
- n = o_save_ptr(output, n);
- debug_print_list("expand_vars_to_list[0]", output, n);
+#if ENABLE_HUSH_JOB
+ pi->pgrp = -1;
+#endif
+ pi->alive_cmds = 1;
+ pi->stopped_cmds = 0;
- while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) {
-#if ENABLE_HUSH_TICK
- o_string subst_result = NULL_O_STRING;
+ /* Check if this is a simple builtin (not part of a pipe).
+ * Builtins within pipes have to fork anyway, and are handled in
+ * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
+ */
+ command = &(pi->cmds[0]);
+
+#if ENABLE_HUSH_FUNCTIONS
+ if (single_and_fg && command->group && command->grp_type == GRP_FUNCTION) {
+ /* We "execute" function definition */
+ bb_error_msg("here we ought to remember function definition, and go on");
+ return EXIT_SUCCESS;
+ }
#endif
- o_addstr(output, arg, p - arg);
- debug_print_list("expand_vars_to_list[1]", output, n);
- arg = ++p;
- p = strchr(p, SPECIAL_VAR_SYMBOL);
- first_ch = arg[0] | or_mask; /* forced to "quoted" if or_mask = 0x80 */
- /* "$@" is special. Even if quoted, it can still
- * expand to nothing (not even an empty string) */
- if ((first_ch & 0x7f) != '@')
- ored_ch |= first_ch;
- val = NULL;
- switch (first_ch & 0x7f) {
- /* Highest bit in first_ch indicates that var is double-quoted */
- case '$': /* pid */
- val = utoa(G.root_pid);
- break;
- case '!': /* bg pid */
- val = G.last_bg_pid ? utoa(G.last_bg_pid) : (char*)"";
- break;
- case '?': /* exitcode */
- val = utoa(G.last_return_code);
- break;
- case '#': /* argc */
- val = utoa(G.global_argc ? G.global_argc-1 : 0);
- break;
- case '*':
- case '@':
- i = 1;
- if (!G.global_argv[i])
- break;
- ored_ch |= first_ch; /* do it for "$@" _now_, when we know it's not empty */
- if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
- smallint sv = output->o_quote;
- /* unquoted var's contents should be globbed, so don't quote */
- output->o_quote = 0;
- while (G.global_argv[i]) {
- n = expand_on_ifs(output, n, G.global_argv[i]);
- debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1);
- if (G.global_argv[i++][0] && G.global_argv[i]) {
- /* this argv[] is not empty and not last:
- * put terminating NUL, start new word */
- o_addchr(output, '\0');
- debug_print_list("expand_vars_to_list[2]", output, n);
- n = o_save_ptr(output, n);
- debug_print_list("expand_vars_to_list[3]", output, n);
- }
- }
- output->o_quote = sv;
- } else
- /* If or_mask is nonzero, we handle assignment 'a=....$@.....'
- * and in this case should treat it like '$*' - see 'else...' below */
- if (first_ch == ('@'|0x80) && !or_mask) { /* quoted $@ */
- while (1) {
- o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i]));
- if (++i >= G.global_argc)
- break;
- o_addchr(output, '\0');
- debug_print_list("expand_vars_to_list[4]", output, n);
- n = o_save_ptr(output, n);
- }
- } else { /* quoted $*: add as one word */
- while (1) {
- o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i]));
- if (!G.global_argv[++i])
- break;
- if (G.ifs[0])
- o_addchr(output, G.ifs[0]);
- }
+ if (single_and_fg && command->group && command->grp_type == GRP_NORMAL) {
+ debug_printf("non-subshell grouping\n");
+ setup_redirects(command, squirrel);
+ debug_printf_exec(": run_list\n");
+ rcode = run_list(command->group) & 0xff;
+ restore_redirects(squirrel);
+ debug_printf_exec("run_pipe return %d\n", rcode);
+ IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
+ return rcode;
+ }
+
+ argv = command->argv;
+ argv_expanded = NULL;
+
+ if (single_and_fg && argv != NULL) {
+ char **new_env = NULL;
+ char **old_env = NULL;
+
+ i = command->assignment_cnt;
+ if (i != 0 && argv[i] == NULL) {
+ /* assignments, but no command: set local environment */
+ for (i = 0; argv[i] != NULL; i++) {
+ debug_printf("local environment set: %s\n", argv[i]);
+ p = expand_string_to_string(argv[i]);
+ set_local_var(p, 0);
}
- break;
- case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */
- /* "Empty variable", used to make "" etc to not disappear */
- arg++;
- ored_ch = 0x80;
- break;
-#if ENABLE_HUSH_TICK
- case '`': { /* <SPECIAL_VAR_SYMBOL>`cmd<SPECIAL_VAR_SYMBOL> */
- struct in_str input;
- *p = '\0';
- arg++;
-//TODO: can we just stuff it into "output" directly?
- debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch);
- setup_string_in_str(&input, arg);
- process_command_subs(&subst_result, &input, NULL);
- debug_printf_subst("SUBST RES '%s'\n", subst_result.data);
- val = subst_result.data;
- goto store_val;
+ return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
}
+
+ /* Expand the rest into (possibly) many strings each */
+ argv_expanded = expand_strvec_to_strvec(argv + i);
+
+ for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
+ if (strcmp(argv_expanded[0], x->cmd) != 0)
+ continue;
+ if (x->function == builtin_exec && argv_expanded[1] == NULL) {
+ debug_printf("exec with redirects only\n");
+ setup_redirects(command, NULL);
+ rcode = EXIT_SUCCESS;
+ goto clean_up_and_ret1;
+ }
+ debug_printf("builtin inline %s\n", argv_expanded[0]);
+ /* XXX setup_redirects acts on file descriptors, not FILEs.
+ * This is perfect for work that comes after exec().
+ * Is it really safe for inline use? Experimentally,
+ * things seem to work with glibc. */
+ setup_redirects(command, squirrel);
+ new_env = expand_assignments(argv, command->assignment_cnt);
+ old_env = putenv_all_and_save_old(new_env);
+ debug_printf_exec(": builtin '%s' '%s'...\n", x->cmd, argv_expanded[1]);
+ rcode = x->function(argv_expanded) & 0xff;
+#if ENABLE_FEATURE_SH_STANDALONE
+ clean_up_and_ret:
#endif
- default: /* <SPECIAL_VAR_SYMBOL>varname<SPECIAL_VAR_SYMBOL> */
- *p = '\0';
- arg[0] = first_ch & 0x7f;
- if (isdigit(arg[0])) {
- i = xatoi_u(arg);
- if (i < G.global_argc)
- val = G.global_argv[i];
- /* else val remains NULL: $N with too big N */
- } else
- val = lookup_param(arg);
- arg[0] = first_ch;
-#if ENABLE_HUSH_TICK
- store_val:
+ restore_redirects(squirrel);
+ free_strings_and_unsetenv(new_env, 1);
+ putenv_all(old_env);
+ free(old_env); /* not free_strings()! */
+ clean_up_and_ret1:
+ free(argv_expanded);
+ IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
+ debug_printf_exec("run_pipe return %d\n", rcode);
+ return rcode;
+ }
+#if ENABLE_FEATURE_SH_STANDALONE
+ i = find_applet_by_name(argv_expanded[0]);
+ if (i >= 0 && APPLET_IS_NOFORK(i)) {
+ setup_redirects(command, squirrel);
+ save_nofork_data(&G.nofork_save);
+ new_env = expand_assignments(argv, command->assignment_cnt);
+ old_env = putenv_all_and_save_old(new_env);
+ debug_printf_exec(": run_nofork_applet '%s' '%s'...\n", argv_expanded[0], argv_expanded[1]);
+ rcode = run_nofork_applet_prime(&G.nofork_save, i, argv_expanded);
+ goto clean_up_and_ret;
+ }
#endif
- *p = SPECIAL_VAR_SYMBOL;
- if (!(first_ch & 0x80)) { /* unquoted $VAR */
- debug_printf_expand("unquoted '%s', output->o_quote:%d\n", val, output->o_quote);
- if (val) {
- /* unquoted var's contents should be globbed, so don't quote */
- smallint sv = output->o_quote;
- output->o_quote = 0;
- n = expand_on_ifs(output, n, val);
- val = NULL;
- output->o_quote = sv;
+ }
+
+ /* NB: argv_expanded may already be created, and that
+ * might include `cmd` runs! Do not rerun it! We *must*
+ * use argv_expanded if it's non-NULL */
+
+ /* Disable job control signals for shell (parent) and
+ * for initial child code after fork */
+ set_jobctrl_sighandler(SIG_IGN);
+
+ /* Going to fork a child per each pipe member */
+ pi->alive_cmds = 0;
+ nextin = 0;
+
+ for (i = 0; i < pi->num_cmds; i++) {
+#if !BB_MMU
+ volatile nommu_save_t nommu_save;
+ nommu_save.new_env = NULL;
+ nommu_save.old_env = NULL;
+ nommu_save.argv = NULL;
+#endif
+ command = &(pi->cmds[i]);
+ if (command->argv) {
+ debug_printf_exec(": pipe member '%s' '%s'...\n", command->argv[0], command->argv[1]);
+ } else
+ debug_printf_exec(": pipe member with no argv\n");
+
+ /* pipes are inserted between pairs of commands */
+ pipefds[0] = 0;
+ pipefds[1] = 1;
+ if ((i + 1) < pi->num_cmds)
+ xpipe(pipefds);
+
+ command->pid = BB_MMU ? fork() : vfork();
+ if (!command->pid) { /* child */
+ if (ENABLE_HUSH_JOB)
+ die_sleep = 0; /* let nofork's xfuncs die */
+#if ENABLE_HUSH_JOB
+ /* Every child adds itself to new process group
+ * with pgid == pid_of_first_child_in_pipe */
+ if (G.run_list_level == 1 && G.interactive_fd) {
+ pid_t pgrp;
+ /* Don't do pgrp restore anymore on fatal signals */
+ set_fatal_sighandler(SIG_DFL);
+ pgrp = pi->pgrp;
+ if (pgrp < 0) /* true for 1st process only */
+ pgrp = getpid();
+ if (setpgid(0, pgrp) == 0 && pi->followup != PIPE_BG) {
+ /* We do it in *every* child, not just first,
+ * to avoid races */
+ tcsetpgrp(G.interactive_fd, pgrp);
}
- } else { /* quoted $VAR, val will be appended below */
- debug_printf_expand("quoted '%s', output->o_quote:%d\n", val, output->o_quote);
}
+#endif
+ xmove_fd(nextin, 0);
+ xmove_fd(pipefds[1], 1); /* write end */
+ if (pipefds[0] > 1)
+ close(pipefds[0]); /* read end */
+ /* Like bash, explicit redirects override pipes,
+ * and the pipe fd is available for dup'ing. */
+ setup_redirects(command, NULL);
+
+ /* Restore default handlers just prior to exec */
+ set_jobctrl_sighandler(SIG_DFL);
+ set_misc_sighandler(SIG_DFL);
+ signal(SIGCHLD, SIG_DFL);
+ /* Stores to nommu_save list of env vars putenv'ed
+ * (NOMMU, on MMU we don't need that) */
+ /* cast away volatility... */
+ pseudo_exec((nommu_save_t*) &nommu_save, command, argv_expanded);
+ /* pseudo_exec() does not return */
}
- if (val) {
- o_addQstr(output, val, strlen(val));
+ /* parent */
+#if !BB_MMU
+ /* Clean up after vforked child */
+ free(nommu_save.argv);
+ free_strings_and_unsetenv(nommu_save.new_env, 1);
+ putenv_all(nommu_save.old_env);
+#endif
+ free(argv_expanded);
+ argv_expanded = NULL;
+ if (command->pid < 0) { /* [v]fork failed */
+ /* Clearly indicate, was it fork or vfork */
+ bb_perror_msg(BB_MMU ? "fork" : "vfork");
+ } else {
+ pi->alive_cmds++;
+#if ENABLE_HUSH_JOB
+ /* Second and next children need to know pid of first one */
+ if (pi->pgrp < 0)
+ pi->pgrp = command->pid;
+#endif
}
-#if ENABLE_HUSH_TICK
- o_free(&subst_result);
-#endif
- arg = ++p;
- } /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */
+ if (i)
+ close(nextin);
+ if ((i + 1) < pi->num_cmds)
+ close(pipefds[1]); /* write end */
+ /* Pass read (output) pipe end to next iteration */
+ nextin = pipefds[0];
+ }
- if (arg[0]) {
- debug_print_list("expand_vars_to_list[a]", output, n);
- /* this part is literal, and it was already pre-quoted
- * if needed (much earlier), do not use o_addQstr here! */
- o_addstr(output, arg, strlen(arg) + 1);
- debug_print_list("expand_vars_to_list[b]", output, n);
- } else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */
- && !(ored_ch & 0x80) /* and all vars were not quoted. */
- ) {
- n--;
- /* allow to reuse list[n] later without re-growth */
- output->has_empty_slot = 1;
- } else {
- o_addchr(output, '\0');
+ if (!pi->alive_cmds) {
+ debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n");
+ return 1;
}
- return n;
+
+ debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->alive_cmds);
+ return -1;
}
-static char **expand_variables(char **argv, int or_mask)
-{
- int n;
- char **list;
- char **v;
- o_string output = NULL_O_STRING;
+#ifndef debug_print_tree
+static void debug_print_tree(struct pipe *pi, int lvl)
+{
+ static const char *const PIPE[] = {
+ [PIPE_SEQ] = "SEQ",
+ [PIPE_AND] = "AND",
+ [PIPE_OR ] = "OR" ,
+ [PIPE_BG ] = "BG" ,
+ };
+ static const char *RES[] = {
+ [RES_NONE ] = "NONE" ,
+#if ENABLE_HUSH_IF
+ [RES_IF ] = "IF" ,
+ [RES_THEN ] = "THEN" ,
+ [RES_ELIF ] = "ELIF" ,
+ [RES_ELSE ] = "ELSE" ,
+ [RES_FI ] = "FI" ,
+#endif
+#if ENABLE_HUSH_LOOPS
+ [RES_FOR ] = "FOR" ,
+ [RES_WHILE] = "WHILE",
+ [RES_UNTIL] = "UNTIL",
+ [RES_DO ] = "DO" ,
+ [RES_DONE ] = "DONE" ,
+#endif
+#if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
+ [RES_IN ] = "IN" ,
+#endif
+#if ENABLE_HUSH_CASE
+ [RES_CASE ] = "CASE" ,
+ [RES_MATCH] = "MATCH",
+ [RES_CASEI] = "CASEI",
+ [RES_ESAC ] = "ESAC" ,
+#endif
+ [RES_XXXX ] = "XXXX" ,
+ [RES_SNTX ] = "SNTX" ,
+ };
+ static const char *const GRPTYPE[] = {
+ "()",
+ "{}",
+#if ENABLE_HUSH_FUNCTIONS
+ "func()",
+#endif
+ };
+
+ int pin, prn;
- if (or_mask & 0x100) {
- output.o_quote = 1; /* protect against globbing for "$var" */
- /* (unquoted $var will temporarily switch it off) */
- output.o_glob = 1;
- }
+ pin = 0;
+ while (pi) {
+ fprintf(stderr, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "",
+ pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]);
+ prn = 0;
+ while (prn < pi->num_cmds) {
+ struct command *command = &pi->cmds[prn];
+ char **argv = command->argv;
- n = 0;
- v = argv;
- while (*v) {
- n = expand_vars_to_list(&output, n, *v, (char)or_mask);
- v++;
+ fprintf(stderr, "%*s prog %d assignment_cnt:%d", lvl*2, "", prn, command->assignment_cnt);
+ if (command->group) {
+ fprintf(stderr, " group %s: (argv=%p)\n",
+ GRPTYPE[command->grp_type],
+ argv);
+ debug_print_tree(command->group, lvl+1);
+ prn++;
+ continue;
+ }
+ if (argv) while (*argv) {
+ fprintf(stderr, " '%s'", *argv);
+ argv++;
+ }
+ fprintf(stderr, "\n");
+ prn++;
+ }
+ pi = pi->next;
+ pin++;
}
- debug_print_list("expand_variables", &output, n);
-
- /* output.data (malloced in one block) gets returned in "list" */
- list = o_finalize_list(&output, n);
- debug_print_strings("expand_variables[1]", list);
- return list;
-}
-
-static char **expand_strvec_to_strvec(char **argv)
-{
- return expand_variables(argv, 0x100);
}
+#endif
-/* Used for expansion of right hand of assignments */
-/* NB: should NOT do globbing! "export v=/bin/c*; env | grep ^v=" outputs
- * "v=/bin/c*" */
-static char *expand_string_to_string(const char *str)
+/* NB: called by pseudo_exec, and therefore must not modify any
+ * global data until exec/_exit (we can be a child after vfork!) */
+static int run_list(struct pipe *pi)
{
- char *argv[2], **list;
-
- argv[0] = (char*)str;
- argv[1] = NULL;
- list = expand_variables(argv, 0x80); /* 0x80: make one-element expansion */
- if (HUSH_DEBUG)
- if (!list[0] || list[1])
- bb_error_msg_and_die("BUG in varexp2");
- /* actually, just move string 2*sizeof(char*) bytes back */
- overlapping_strcpy((char*)list, list[0]);
- debug_printf_expand("string_to_string='%s'\n", (char*)list);
- return (char*)list;
-}
+#if ENABLE_HUSH_CASE
+ char *case_word = NULL;
+#endif
+#if ENABLE_HUSH_LOOPS
+ struct pipe *loop_top = NULL;
+ char *for_varname = NULL;
+ char **for_lcur = NULL;
+ char **for_list = NULL;
+#endif
+ smallint flag_skip = 1;
+ smalluint rcode = 0; /* probably just for compiler */
+#if ENABLE_HUSH_IF || ENABLE_HUSH_CASE
+ smalluint cond_code = 0;
+#else
+ enum { cond_code = 0, };
+#endif
+ /*enum reserved_style*/ smallint rword = RES_NONE;
+ /*enum reserved_style*/ smallint skip_more_for_this_rword = RES_XXXX;
-/* Used for "eval" builtin */
-static char* expand_strvec_to_string(char **argv)
-{
- char **list;
+ debug_printf_exec("run_list start lvl %d\n", G.run_list_level + 1);
- list = expand_variables(argv, 0x80);
- /* Convert all NULs to spaces */
- if (list[0]) {
- int n = 1;
- while (list[n]) {
- if (HUSH_DEBUG)
- if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
- bb_error_msg_and_die("BUG in varexp3");
- list[n][-1] = ' '; /* TODO: or to G.ifs[0]? */
- n++;
+#if ENABLE_HUSH_LOOPS
+ /* Check syntax for "for" */
+ for (struct pipe *cpipe = pi; cpipe; cpipe = cpipe->next) {
+ if (cpipe->res_word != RES_FOR && cpipe->res_word != RES_IN)
+ continue;
+ /* current word is FOR or IN (BOLD in comments below) */
+ if (cpipe->next == NULL) {
+ syntax("malformed for");
+ debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
+ return 1;
+ }
+ /* "FOR v; do ..." and "for v IN a b; do..." are ok */
+ if (cpipe->next->res_word == RES_DO)
+ continue;
+ /* next word is not "do". It must be "in" then ("FOR v in ...") */
+ if (cpipe->res_word == RES_IN /* "for v IN a b; not_do..."? */
+ || cpipe->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */
+ ) {
+ syntax("malformed for");
+ debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
+ return 1;
}
}
- overlapping_strcpy((char*)list, list[0]);
- debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
- return (char*)list;
-}
-
+#endif
-/* Used to get/check local shell variables */
-static struct variable *get_local_var(const char *name)
-{
- struct variable *cur;
- int len;
+ /* Past this point, all code paths should jump to ret: label
+ * in order to return, no direct "return" statements please.
+ * This helps to ensure that no memory is leaked. */
- if (!name)
- return NULL;
- len = strlen(name);
- for (cur = G.top_var; cur; cur = cur->next) {
- if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
- return cur;
+#if ENABLE_HUSH_JOB
+ /* Example of nested list: "while true; do { sleep 1 | exit 2; } done".
+ * We are saving state before entering outermost list ("while...done")
+ * so that ctrl-Z will correctly background _entire_ outermost list,
+ * not just a part of it (like "sleep 1 | exit 2") */
+ if (++G.run_list_level == 1 && G.interactive_fd) {
+ if (sigsetjmp(G.toplevel_jb, 1)) {
+ /* ctrl-Z forked and we are parent; or ctrl-C.
+ * Sighandler has longjmped us here */
+ signal(SIGINT, SIG_IGN);
+ signal(SIGTSTP, SIG_IGN);
+ /* Restore level (we can be coming from deep inside
+ * nested levels) */
+ G.run_list_level = 1;
+#if ENABLE_FEATURE_SH_STANDALONE
+ if (G.nofork_save.saved) { /* if save area is valid */
+ debug_printf_jobs("exiting nofork early\n");
+ restore_nofork_data(&G.nofork_save);
+ }
+#endif
+ if (G.ctrl_z_flag) {
+ /* ctrl-Z has forked and stored pid of the child in pi->pid.
+ * Remember this child as background job */
+ insert_bg_job(pi);
+ } else {
+ /* ctrl-C. We just stop doing whatever we were doing */
+ bb_putchar('\n');
+ }
+ USE_HUSH_LOOPS(loop_top = NULL;)
+ USE_HUSH_LOOPS(G.depth_of_loop = 0;)
+ rcode = 0;
+ goto ret;
+ }
+ /* ctrl-Z handler will store pid etc in pi */
+ G.toplevel_list = pi;
+ G.ctrl_z_flag = 0;
+#if ENABLE_FEATURE_SH_STANDALONE
+ G.nofork_save.saved = 0; /* in case we will run a nofork later */
+#endif
+ signal_SA_RESTART_empty_mask(SIGTSTP, handler_ctrl_z);
+ signal(SIGINT, handler_ctrl_c);
}
- return NULL;
-}
+#endif /* JOB */
-/* str holds "NAME=VAL" and is expected to be malloced.
- * We take ownership of it. */
-static int set_local_var(char *str, int flg_export)
-{
- struct variable *cur;
- char *value;
- int name_len;
+ /* Go through list of pipes, (maybe) executing them. */
+ for (; pi; pi = USE_HUSH_LOOPS(rword == RES_DONE ? loop_top : ) pi->next) {
+ IF_HAS_KEYWORDS(rword = pi->res_word;)
+ IF_HAS_NO_KEYWORDS(rword = RES_NONE;)
+ debug_printf_exec(": rword=%d cond_code=%d skip_more=%d\n",
+ rword, cond_code, skip_more_for_this_rword);
+#if ENABLE_HUSH_LOOPS
+ if ((rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR)
+ && loop_top == NULL /* avoid bumping G.depth_of_loop twice */
+ ) {
+ /* start of a loop: remember where loop starts */
+ loop_top = pi;
+ G.depth_of_loop++;
+ }
+#endif
+ if (rword == skip_more_for_this_rword && flag_skip) {
+ if (pi->followup == PIPE_SEQ)
+ flag_skip = 0;
+ /* it is "<false> && CMD" or "<true> || CMD"
+ * and we should not execute CMD */
+ continue;
+ }
+ flag_skip = 1;
+ skip_more_for_this_rword = RES_XXXX;
+#if ENABLE_HUSH_IF
+ if (cond_code) {
+ if (rword == RES_THEN) {
+ /* "if <false> THEN cmd": skip cmd */
+ continue;
+ }
+ } else {
+ if (rword == RES_ELSE || rword == RES_ELIF) {
+ /* "if <true> then ... ELSE/ELIF cmd":
+ * skip cmd and all following ones */
+ break;
+ }
+ }
+#endif
+#if ENABLE_HUSH_LOOPS
+ if (rword == RES_FOR) { /* && pi->num_cmds - always == 1 */
+ if (!for_lcur) {
+ /* first loop through for */
- value = strchr(str, '=');
- if (!value) { /* not expected to ever happen? */
- free(str);
- return -1;
- }
+ static const char encoded_dollar_at[] ALIGN1 = {
+ SPECIAL_VAR_SYMBOL, '@' | 0x80, SPECIAL_VAR_SYMBOL, '\0'
+ }; /* encoded representation of "$@" */
+ static const char *const encoded_dollar_at_argv[] = {
+ encoded_dollar_at, NULL
+ }; /* argv list with one element: "$@" */
+ char **vals;
- name_len = value - str + 1; /* including '=' */
- cur = G.top_var; /* cannot be NULL (we have HUSH_VERSION and it's RO) */
- while (1) {
- if (strncmp(cur->varstr, str, name_len) != 0) {
- if (!cur->next) {
- /* Bail out. Note that now cur points
- * to last var in linked list */
+ vals = (char**)encoded_dollar_at_argv;
+ if (pi->next->res_word == RES_IN) {
+ /* if no variable values after "in" we skip "for" */
+ if (!pi->next->cmds[0].argv)
+ break;
+ vals = pi->next->cmds[0].argv;
+ } /* else: "for var; do..." -> assume "$@" list */
+ /* create list of variable values */
+ debug_print_strings("for_list made from", vals);
+ for_list = expand_strvec_to_strvec(vals);
+ for_lcur = for_list;
+ debug_print_strings("for_list", for_list);
+ for_varname = pi->cmds[0].argv[0];
+ pi->cmds[0].argv[0] = NULL;
+ }
+ free(pi->cmds[0].argv[0]);
+ if (!*for_lcur) {
+ /* "for" loop is over, clean up */
+ free(for_list);
+ for_list = NULL;
+ for_lcur = NULL;
+ pi->cmds[0].argv[0] = for_varname;
break;
}
- cur = cur->next;
+ /* insert next value from for_lcur */
+//TODO: does it need escaping?
+ pi->cmds[0].argv[0] = xasprintf("%s=%s", for_varname, *for_lcur++);
+ pi->cmds[0].assignment_cnt = 1;
+ }
+ if (rword == RES_IN) /* "for v IN list;..." - "in" has no cmds anyway */
continue;
+ if (rword == RES_DONE) {
+ continue; /* "done" has no cmds too */
}
- /* We found an existing var with this name */
- *value = '\0';
- if (cur->flg_read_only) {
- bb_error_msg("%s: readonly variable", str);
- free(str);
- return -1;
+#endif
+#if ENABLE_HUSH_CASE
+ if (rword == RES_CASE) {
+ case_word = expand_strvec_to_string(pi->cmds->argv);
+ continue;
}
- debug_printf_env("%s: unsetenv '%s'\n", __func__, str);
- unsetenv(str); /* just in case */
- *value = '=';
- if (strcmp(cur->varstr, str) == 0) {
- free_and_exp:
- free(str);
- goto exp;
+ if (rword == RES_MATCH) {
+ char **argv;
+
+ if (!case_word) /* "case ... matched_word) ... WORD)": we executed selected branch, stop */
+ break;
+ /* all prev words didn't match, does this one match? */
+ argv = pi->cmds->argv;
+ while (*argv) {
+ char *pattern = expand_string_to_string(*argv);
+ /* TODO: which FNM_xxx flags to use? */
+ cond_code = (fnmatch(pattern, case_word, /*flags:*/ 0) != 0);
+ free(pattern);
+ if (cond_code == 0) { /* match! we will execute this branch */
+ free(case_word); /* make future "word)" stop */
+ case_word = NULL;
+ break;
+ }
+ argv++;
+ }
+ continue;
}
- if (cur->max_len >= strlen(str)) {
- /* This one is from startup env, reuse space */
- strcpy(cur->varstr, str);
- goto free_and_exp;
+ if (rword == RES_CASEI) { /* inside of a case branch */
+ if (cond_code != 0)
+ continue; /* not matched yet, skip this pipe */
}
- /* max_len == 0 signifies "malloced" var, which we can
- * (and has to) free */
- if (!cur->max_len)
- free(cur->varstr);
- cur->max_len = 0;
- goto set_str_and_exp;
- }
+#endif
+ if (pi->num_cmds == 0)
+ continue;
- /* Not found - create next variable struct */
- cur->next = xzalloc(sizeof(*cur));
- cur = cur->next;
+ /* After analyzing all keywords and conditions, we decided
+ * to execute this pipe. NB: has to do checkjobs(NULL)
+ * after run_pipe() to collect any background children,
+ * even if list execution is to be stopped. */
+ debug_printf_exec(": run_pipe with %d members\n", pi->num_cmds);
+ {
+ int r;
+#if ENABLE_HUSH_LOOPS
+ G.flag_break_continue = 0;
+#endif
+ rcode = r = run_pipe(pi); /* NB: rcode is a smallint */
+ if (r != -1) {
+ /* we only ran a builtin: rcode is already known
+ * and we don't need to wait for anything. */
+#if ENABLE_HUSH_LOOPS
+ /* was it "break" or "continue"? */
+ if (G.flag_break_continue) {
+ smallint fbc = G.flag_break_continue;
+ /* we might fall into outer *loop*,
+ * don't want to break it too */
+ if (loop_top) {
+ G.depth_break_continue--;
+ if (G.depth_break_continue == 0)
+ G.flag_break_continue = 0;
+ /* else: e.g. "continue 2" should *break* once, *then* continue */
+ } /* else: "while... do... { we are here (innermost list is not a loop!) };...done" */
+ if (G.depth_break_continue != 0 || fbc == BC_BREAK)
+ goto check_jobs_and_break;
+ /* "continue": simulate end of loop */
+ rword = RES_DONE;
+ continue;
+ }
+#endif
+ } else if (pi->followup == PIPE_BG) {
+ /* what does bash do with attempts to background builtins? */
+ /* even bash 3.2 doesn't do that well with nested bg:
+ * try "{ { sleep 10; echo DEEP; } & echo HERE; } &".
+ * I'm NOT treating inner &'s as jobs */
+#if ENABLE_HUSH_JOB
+ if (G.run_list_level == 1)
+ insert_bg_job(pi);
+#endif
+ rcode = 0; /* EXIT_SUCCESS */
+ } else {
+#if ENABLE_HUSH_JOB
+ if (G.run_list_level == 1 && G.interactive_fd) {
+ /* waits for completion, then fg's main shell */
+ rcode = checkjobs_and_fg_shell(pi);
+ debug_printf_exec(": checkjobs_and_fg_shell returned %d\n", rcode);
+ } else
+#endif
+ { /* this one just waits for completion */
+ rcode = checkjobs(pi);
+ debug_printf_exec(": checkjobs returned %d\n", rcode);
+ }
+ }
+ }
+ debug_printf_exec(": setting last_return_code=%d\n", rcode);
+ G.last_return_code = rcode;
- set_str_and_exp:
- cur->varstr = str;
- exp:
- if (flg_export)
- cur->flg_export = 1;
- if (cur->flg_export) {
- debug_printf_env("%s: putenv '%s'\n", __func__, cur->varstr);
- return putenv(cur->varstr);
+ /* Analyze how result affects subsequent commands */
+#if ENABLE_HUSH_IF
+ if (rword == RES_IF || rword == RES_ELIF)
+ cond_code = rcode;
+#endif
+#if ENABLE_HUSH_LOOPS
+ if (rword == RES_WHILE) {
+ if (rcode) {
+ rcode = 0; /* "while false; do...done" - exitcode 0 */
+ goto check_jobs_and_break;
+ }
+ }
+ if (rword == RES_UNTIL) {
+ if (!rcode) {
+ check_jobs_and_break:
+ checkjobs(NULL);
+ break;
+ }
+ }
+#endif
+ if ((rcode == 0 && pi->followup == PIPE_OR)
+ || (rcode != 0 && pi->followup == PIPE_AND)
+ ) {
+ skip_more_for_this_rword = rword;
+ }
+ checkjobs(NULL);
+ } /* for (pi) */
+
+#if ENABLE_HUSH_JOB
+ if (G.ctrl_z_flag) {
+ /* ctrl-Z forked somewhere in the past, we are the child,
+ * and now we completed running the list. Exit. */
+//TODO: _exit?
+ exit(rcode);
}
- return 0;
+ ret:
+ if (!--G.run_list_level && G.interactive_fd) {
+ signal(SIGTSTP, SIG_IGN);
+ signal(SIGINT, SIG_IGN);
+ }
+#endif
+ debug_printf_exec("run_list lvl %d return %d\n", G.run_list_level + 1, rcode);
+#if ENABLE_HUSH_LOOPS
+ if (loop_top)
+ G.depth_of_loop--;
+ free(for_list);
+#endif
+#if ENABLE_HUSH_CASE
+ free(case_word);
+#endif
+ return rcode;
}
-static void unset_local_var(const char *name)
+/* Select which version we will use */
+static int run_and_free_list(struct pipe *pi)
{
- struct variable *cur;
- struct variable *prev = prev; /* for gcc */
- int name_len;
-
- if (!name)
- return;
- name_len = strlen(name);
- cur = G.top_var;
- while (cur) {
- if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') {
- if (cur->flg_read_only) {
- bb_error_msg("%s: readonly variable", name);
- return;
- }
- /* prev is ok to use here because 1st variable, HUSH_VERSION,
- * is ro, and we cannot reach this code on the 1st pass */
- prev->next = cur->next;
- debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr);
- bb_unsetenv(cur->varstr);
- if (!cur->max_len)
- free(cur->varstr);
- free(cur);
- return;
- }
- prev = cur;
- cur = cur->next;
+ int rcode = 0;
+ debug_printf_exec("run_and_free_list entered\n");
+ if (!G.fake_mode) {
+ debug_printf_exec(": run_list with %d members\n", pi->num_cmds);
+ rcode = run_list(pi);
+ }
+ /* free_pipe_list has the side effect of clearing memory.
+ * In the long run that function can be merged with run_list,
+ * but doing that now would hobble the debugging effort. */
+ free_pipe_list(pi, /* indent: */ 0);
+ debug_printf_exec("run_and_free_list return %d\n", rcode);
+ return rcode;
+}
+
+
+/* Peek ahead in the in_str to find out if we have a "&n" construct,
+ * as in "2>&1", that represents duplicating a file descriptor.
+ * Return either -2 (syntax error), -1 (no &), or the number found.
+ */
+static int redirect_dup_num(struct in_str *input)
+{
+ int ch, d = 0, ok = 0;
+ ch = i_peek(input);
+ if (ch != '&') return -1;
+
+ i_getch(input); /* get the & */
+ ch = i_peek(input);
+ if (ch == '-') {
+ i_getch(input);
+ return -3; /* "-" represents "close me" */
+ }
+ while (isdigit(ch)) {
+ d = d*10 + (ch-'0');
+ ok = 1;
+ i_getch(input);
+ ch = i_peek(input);
}
+ if (ok) return d;
+
+ bb_error_msg("ambiguous redirect");
+ return -2;
}
/* The src parameter allows us to peek forward to a possible &n syntax
return 0;
}
+
static struct pipe *new_pipe(void)
{
struct pipe *pi;
return pi;
}
+/* Command (member of a pipe) is complete. The only possible error here
+ * is out of memory, in which case xmalloc exits. */
+static int done_command(struct parse_context *ctx)
+{
+ /* The command is really already in the pipe structure, so
+ * advance the pipe counter and make a new, null command. */
+ struct pipe *pi = ctx->pipe;
+ struct command *command = ctx->command;
+
+ if (command) {
+ if (command->group == NULL
+ && command->argv == NULL
+ && command->redirects == NULL
+ ) {
+ debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds);
+ return pi->num_cmds;
+ }
+ pi->num_cmds++;
+ debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds);
+ } else {
+ debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds);
+ }
+
+ /* Only real trickiness here is that the uncommitted
+ * command structure is not counted in pi->num_cmds. */
+ pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1));
+ command = &pi->cmds[pi->num_cmds];
+ memset(command, 0, sizeof(*command));
+
+ ctx->command = command;
+ /* but ctx->pipe and ctx->list_head remain unchanged */
+
+ return pi->num_cmds; /* used only for 0/nonzero check */
+}
+
+static void done_pipe(struct parse_context *ctx, pipe_style type)
+{
+ int not_null;
+
+ debug_printf_parse("done_pipe entered, followup %d\n", type);
+ /* Close previous command */
+ not_null = done_command(ctx);
+ ctx->pipe->followup = type;
+ IF_HAS_KEYWORDS(ctx->pipe->pi_inverted = ctx->ctx_inverted;)
+ IF_HAS_KEYWORDS(ctx->ctx_inverted = 0;)
+ IF_HAS_KEYWORDS(ctx->pipe->res_word = ctx->ctx_res_w;)
+
+ /* Without this check, even just <enter> on command line generates
+ * tree of three NOPs (!). Which is harmless but annoying.
+ * IOW: it is safe to do it unconditionally.
+ * RES_NONE case is for "for a in; do ..." (empty IN set)
+ * to work, possibly other cases too. */
+ if (not_null IF_HAS_KEYWORDS(|| ctx->ctx_res_w != RES_NONE)) {
+ struct pipe *new_p;
+ debug_printf_parse("done_pipe: adding new pipe: "
+ "not_null:%d ctx->ctx_res_w:%d\n",
+ not_null, ctx->ctx_res_w);
+ new_p = new_pipe();
+ ctx->pipe->next = new_p;
+ ctx->pipe = new_p;
+ ctx->command = NULL; /* needed! */
+ /* RES_THEN, RES_DO etc are "sticky" -
+ * they remain set for commands inside if/while.
+ * This is used to control execution.
+ * RES_FOR and RES_IN are NOT sticky (needed to support
+ * cases where variable or value happens to match a keyword):
+ */
+#if ENABLE_HUSH_LOOPS
+ if (ctx->ctx_res_w == RES_FOR
+ || ctx->ctx_res_w == RES_IN)
+ ctx->ctx_res_w = RES_NONE;
+#endif
+#if ENABLE_HUSH_CASE
+ if (ctx->ctx_res_w == RES_MATCH)
+ ctx->ctx_res_w = RES_CASEI;
+#endif
+ /* Create the memory for command, roughly:
+ * ctx->pipe->cmds = new struct command;
+ * ctx->command = &ctx->pipe->cmds[0];
+ */
+ done_command(ctx);
+ }
+ debug_printf_parse("done_pipe return\n");
+}
+
static void initialize_context(struct parse_context *ctx)
{
memset(ctx, 0, sizeof(*ctx));
done_command(ctx);
}
+
/* If a reserved word is found and processed, parse context is modified
* and 1 is returned.
* Handles if, then, elif, else, fi, for, while, until, do, done.
return 0;
}
-/* Command (member of a pipe) is complete. The only possible error here
- * is out of memory, in which case xmalloc exits. */
-static int done_command(struct parse_context *ctx)
-{
- /* The command is really already in the pipe structure, so
- * advance the pipe counter and make a new, null command. */
- struct pipe *pi = ctx->pipe;
- struct command *command = ctx->command;
-
- if (command) {
- if (command->group == NULL
- && command->argv == NULL
- && command->redirects == NULL
- ) {
- debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds);
- return pi->num_cmds;
- }
- pi->num_cmds++;
- debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds);
- } else {
- debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds);
- }
-
- /* Only real trickiness here is that the uncommitted
- * command structure is not counted in pi->num_cmds. */
- pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1));
- command = &pi->cmds[pi->num_cmds];
- memset(command, 0, sizeof(*command));
-
- ctx->command = command;
- /* but ctx->pipe and ctx->list_head remain unchanged */
-
- return pi->num_cmds; /* used only for 0/nonzero check */
-}
-
-static void done_pipe(struct parse_context *ctx, pipe_style type)
-{
- int not_null;
-
- debug_printf_parse("done_pipe entered, followup %d\n", type);
- /* Close previous command */
- not_null = done_command(ctx);
- ctx->pipe->followup = type;
- IF_HAS_KEYWORDS(ctx->pipe->pi_inverted = ctx->ctx_inverted;)
- IF_HAS_KEYWORDS(ctx->ctx_inverted = 0;)
- IF_HAS_KEYWORDS(ctx->pipe->res_word = ctx->ctx_res_w;)
-
- /* Without this check, even just <enter> on command line generates
- * tree of three NOPs (!). Which is harmless but annoying.
- * IOW: it is safe to do it unconditionally.
- * RES_NONE case is for "for a in; do ..." (empty IN set)
- * to work, possibly other cases too. */
- if (not_null IF_HAS_KEYWORDS(|| ctx->ctx_res_w != RES_NONE)) {
- struct pipe *new_p;
- debug_printf_parse("done_pipe: adding new pipe: "
- "not_null:%d ctx->ctx_res_w:%d\n",
- not_null, ctx->ctx_res_w);
- new_p = new_pipe();
- ctx->pipe->next = new_p;
- ctx->pipe = new_p;
- ctx->command = NULL; /* needed! */
- /* RES_THEN, RES_DO etc are "sticky" -
- * they remain set for commands inside if/while.
- * This is used to control execution.
- * RES_FOR and RES_IN are NOT sticky (needed to support
- * cases where variable or value happens to match a keyword):
- */
-#if ENABLE_HUSH_LOOPS
- if (ctx->ctx_res_w == RES_FOR
- || ctx->ctx_res_w == RES_IN)
- ctx->ctx_res_w = RES_NONE;
-#endif
-#if ENABLE_HUSH_CASE
- if (ctx->ctx_res_w == RES_MATCH)
- ctx->ctx_res_w = RES_CASEI;
-#endif
- /* Create the memory for command, roughly:
- * ctx->pipe->cmds = new struct command;
- * ctx->command = &ctx->pipe->cmds[0];
- */
- done_command(ctx);
- }
- debug_printf_parse("done_pipe return\n");
-}
-
-/* Peek ahead in the in_str to find out if we have a "&n" construct,
- * as in "2>&1", that represents duplicating a file descriptor.
- * Return either -2 (syntax error), -1 (no &), or the number found.
- */
-static int redirect_dup_num(struct in_str *input)
-{
- int ch, d = 0, ok = 0;
- ch = i_peek(input);
- if (ch != '&') return -1;
-
- i_getch(input); /* get the & */
- ch = i_peek(input);
- if (ch == '-') {
- i_getch(input);
- return -3; /* "-" represents "close me" */
- }
- while (isdigit(ch)) {
- d = d*10 + (ch-'0');
- ok = 1;
- i_getch(input);
- ch = i_peek(input);
- }
- if (ok) return d;
-
- bb_error_msg("ambiguous redirect");
- return -2;
-}
-
/* If a redirect is immediately preceded by a number, that number is
* supposed to tell which file descriptor to redirect. This routine
* looks for such preceding numbers. In an ideal world this routine
/* 'head' is freed by the caller */
}
+static int parse_stream(o_string *dest, struct parse_context *ctx,
+ struct in_str *input0, const char *end_trigger);
+
/* Return code is exit status of the process that is run. */
static int process_command_subs(o_string *dest,
struct in_str *input,
/* command remains "open", available for possible redirects */
}
-/* Basically useful version until someone wants to get fancier,
- * see the bash man page under "Parameter Expansion" */
-static const char *lookup_param(const char *src)
-{
- struct variable *var = get_local_var(src);
- if (var)
- return strchr(var->varstr, '=') + 1;
- return NULL;
-}
-
#if ENABLE_HUSH_TICK
/* Subroutines for copying $(...) and `...` things */
static void add_till_backquote(o_string *dest, struct in_str *input);
* -1 on EOF (but if end_trigger == NULL then return 0),
* 1 for syntax error */
static int parse_stream(o_string *dest, struct parse_context *ctx,
- struct in_str *input, const char *end_trigger)
+ struct in_str *input, const char *end_trigger)
{
int ch, m;
int redir_fd;
*/
static int builtin_set(char **argv)
{
- struct variable *e;
- char **pp;
+ int n;
+ char **pp, **g_argv;
char *arg = *++argv;
if (arg == NULL) {
+ struct variable *e;
for (e = G.top_var; e; e = e->next)
puts(e->varstr);
- } else {
- /* NB: G.global_argv[0] ($0) is never freed/changed */
+ return EXIT_SUCCESS;
+ }
- if (G.global_args_malloced) {
- pp = G.global_argv;
- while (*++pp)
- free(*pp);
- G.global_argv[1] = NULL;
- } else {
- G.global_args_malloced = 1;
- pp = xzalloc(sizeof(pp[0]) * 2);
- pp[0] = G.global_argv[0]; /* retain $0 */
- G.global_argv = pp;
+ do {
+ if (arg[0] == '+')
+ continue;
+ if (arg[0] != '-')
+ break;
+ if (arg[1] == '-' && arg[2] == '\0') {
+ argv++;
+ break;
}
- do {
- if (arg[0] == '+')
- continue;
- if (arg[0] != '-')
- break;
- if (arg[1] == '-' && arg[2] == '\0') {
- argv++;
- break;
- }
- } while ((arg = *++argv) != NULL);
- /* Now argv[0] is 1st argument */
+ } while ((arg = *++argv) != NULL);
+ /* Now argv[0] is 1st argument */
- /* This realloc's G.global_argv */
- G.global_argv = pp = add_strings_to_strings(G.global_argv, argv, /*dup:*/ 1);
- G.global_argc = 1;
+ /* NB: G.global_argv[0] ($0) is never freed/changed */
+ g_argv = G.global_argv;
+ if (G.global_args_malloced) {
+ pp = g_argv;
while (*++pp)
- G.global_argc++;
+ free(*pp);
+ g_argv[1] = NULL;
+ } else {
+ G.global_args_malloced = 1;
+ pp = xzalloc(sizeof(pp[0]) * 2);
+ pp[0] = g_argv[0]; /* retain $0 */
+ g_argv = pp;
}
+ /* This realloc's G.global_argv */
+ G.global_argv = pp = add_strings_to_strings(g_argv, argv, /*dup:*/ 1);
+
+ n = 1;
+ while (*++pp)
+ n++;
+ G.global_argc = n;
return EXIT_SUCCESS;
}
projects / oweals / busybox.git / commitdiff