*
* TODOs:
* grep for "TODO" and fix (some of them are easy)
+ * make complex ${var%...} constructs support optional
+ * make here documents optional
* special variables (done: PWD, PPID, RANDOM)
+ * follow IFS rules more precisely, including update semantics
* tilde expansion
* aliases
- * follow IFS rules more precisely, including update semantics
* builtins mandated by standards we don't support:
- * [un]alias, command, fc, getopts, newgrp, readonly, times
- * make complex ${var%...} constructs support optional
- * make here documents optional
+ * [un]alias, command, fc, getopts, times:
+ * command -v CMD: print "/path/to/CMD"
+ * prints "CMD" for builtins
+ * prints "alias ALIAS='EXPANSION'" for aliases
+ * prints nothing and sets $? to 1 if not found
+ * command -V CMD: print "CMD is /path/CMD|a shell builtin|etc"
+ * command [-p] CMD: run CMD, even if a function CMD also exists
+ * (can use this to override standalone shell as well)
+ * -p: use default $PATH
+ * command BLTIN: disables special-ness (e.g. errors do not abort)
+ * getopts: getopt() for shells
+ * times: print getrusage(SELF/CHILDREN).ru_utime/ru_stime
+ * fc -l[nr] [BEG] [END]: list range of commands in history
+ * fc [-e EDITOR] [BEG] [END]: edit/rerun range of commands
+ * fc -s [PAT=REP] [CMD]: rerun CMD, replacing PAT with REP
*
* Bash compat TODO:
* redirection of stdout+stderr: &> and >&
* The EXPR is evaluated according to ARITHMETIC EVALUATION.
* This is exactly equivalent to let "EXPR".
* $[EXPR]: synonym for $((EXPR))
+ * indirect expansion: ${!VAR}
+ * substring op on @: ${@:n:m}
*
* Won't do:
+ * Some builtins mandated by standards:
+ * newgrp [GRP]: not a builtin in bash but a suid binary
+ * which spawns a new shell with new group ID
* In bash, export builtin is special, its arguments are assignments
* and therefore expansion of them should be "one-word" expansion:
* $ export i=`echo 'a b'` # export has one arg: "i=a b"
* aaa
*/
//config:config HUSH
-//config: bool "hush"
+//config: bool "hush (64 kb)"
//config: default y
//config: help
-//config: hush is a small shell (25k). It handles the normal flow control
-//config: constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
-//config: case/esac. Redirections, here documents, $((arithmetic))
-//config: and functions are supported.
+//config: hush is a small shell. It handles the normal flow control
+//config: constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
+//config: case/esac. Redirections, here documents, $((arithmetic))
+//config: and functions are supported.
//config:
-//config: It will compile and work on no-mmu systems.
+//config: It will compile and work on no-mmu systems.
//config:
-//config: It does not handle select, aliases, tilde expansion,
-//config: &>file and >&file redirection of stdout+stderr.
+//config: It does not handle select, aliases, tilde expansion,
+//config: &>file and >&file redirection of stdout+stderr.
//config:
//config:config HUSH_BASH_COMPAT
//config: bool "bash-compatible extensions"
//config: default y
//config: depends on HUSH_BASH_COMPAT
//config: help
-//config: Enable {abc,def} extension.
+//config: Enable {abc,def} extension.
//config:
//config:config HUSH_INTERACTIVE
//config: bool "Interactive mode"
//config: default y
//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
//config: help
-//config: Enable interactive mode (prompt and command editing).
-//config: Without this, hush simply reads and executes commands
-//config: from stdin just like a shell script from a file.
-//config: No prompt, no PS1/PS2 magic shell variables.
+//config: Enable interactive mode (prompt and command editing).
+//config: Without this, hush simply reads and executes commands
+//config: from stdin just like a shell script from a file.
+//config: No prompt, no PS1/PS2 magic shell variables.
//config:
//config:config HUSH_SAVEHISTORY
//config: bool "Save command history to .hush_history"
//config: default y
//config: depends on HUSH_INTERACTIVE
//config: help
-//config: Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
-//config: command (not entire shell), fg/bg builtins work. Without this option,
-//config: "cmd &" still works by simply spawning a process and immediately
-//config: prompting for next command (or executing next command in a script),
-//config: but no separate process group is formed.
+//config: Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
+//config: command (not entire shell), fg/bg builtins work. Without this option,
+//config: "cmd &" still works by simply spawning a process and immediately
+//config: prompting for next command (or executing next command in a script),
+//config: but no separate process group is formed.
//config:
//config:config HUSH_TICK
//config: bool "Support process substitution"
//config: default y
//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
//config: help
-//config: Enable `command` and $(command).
+//config: Enable `command` and $(command).
//config:
//config:config HUSH_IF
//config: bool "Support if/then/elif/else/fi"
//config: default y
//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
//config: help
-//config: Enable case ... esac statement. +400 bytes.
+//config: Enable case ... esac statement. +400 bytes.
//config:
//config:config HUSH_FUNCTIONS
//config: bool "Support funcname() { commands; } syntax"
//config: default y
//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
//config: help
-//config: Enable support for shell functions. +800 bytes.
+//config: Enable support for shell functions. +800 bytes.
//config:
//config:config HUSH_LOCAL
//config: bool "local builtin"
//config: default y
//config: depends on HUSH_FUNCTIONS
//config: help
-//config: Enable support for local variables in functions.
+//config: Enable support for local variables in functions.
//config:
//config:config HUSH_RANDOM_SUPPORT
//config: bool "Pseudorandom generator and $RANDOM variable"
//config: default y
//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
//config: help
-//config: Enable pseudorandom generator and dynamic variable "$RANDOM".
-//config: Each read of "$RANDOM" will generate a new pseudorandom value.
+//config: Enable pseudorandom generator and dynamic variable "$RANDOM".
+//config: Each read of "$RANDOM" will generate a new pseudorandom value.
//config:
//config:config HUSH_MODE_X
//config: bool "Support 'hush -x' option and 'set -x' command"
//config: default y
//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
//config: help
-//config: This instructs hush to print commands before execution.
-//config: Adds ~300 bytes.
+//config: This instructs hush to print commands before execution.
+//config: Adds ~300 bytes.
//config:
//config:config HUSH_ECHO
//config: bool "echo builtin"
//config: default y
//config: depends on HUSH_EXPORT
//config: help
-//config: export -n unexports variables. It is a bash extension.
+//config: export -n unexports variables. It is a bash extension.
+//config:
+//config:config HUSH_READONLY
+//config: bool "readonly builtin"
+//config: default y
+//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config: help
+//config: Enable support for read-only variables.
//config:
//config:config HUSH_KILL
//config: bool "kill builtin (supports kill %jobspec)"
//config: bool "memleak builtin (debugging)"
//config: default n
//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
-//config:
-//config:config MSH
-//config: bool "msh (deprecated: aliased to hush)"
-//config: default n
-//config: select HUSH
-//config: help
-//config: msh is deprecated and will be removed, please migrate to hush.
//applet:IF_HUSH(APPLET(hush, BB_DIR_BIN, BB_SUID_DROP))
// APPLET_ODDNAME:name main location suid_type help
-//applet:IF_MSH( APPLET_ODDNAME(msh, hush, BB_DIR_BIN, BB_SUID_DROP, hush))
//applet:IF_SH_IS_HUSH( APPLET_ODDNAME(sh, hush, BB_DIR_BIN, BB_SUID_DROP, hush))
//applet:IF_BASH_IS_HUSH(APPLET_ODDNAME(bash, hush, BB_DIR_BIN, BB_SUID_DROP, hush))
* therefore we don't show them either.
*/
//usage:#define hush_trivial_usage
-//usage: "[-nxl] [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
+//usage: "[-enxl] [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
//usage:#define hush_full_usage "\n\n"
//usage: "Unix shell interpreter"
/* Separate defines document which part of code implements what */
#define BASH_PATTERN_SUBST ENABLE_HUSH_BASH_COMPAT
#define BASH_SUBSTR ENABLE_HUSH_BASH_COMPAT
-#define BASH_TEST2 ENABLE_HUSH_BASH_COMPAT
#define BASH_SOURCE ENABLE_HUSH_BASH_COMPAT
#define BASH_HOSTNAME_VAR ENABLE_HUSH_BASH_COMPAT
+#define BASH_TEST2 (ENABLE_HUSH_BASH_COMPAT && ENABLE_HUSH_TEST)
/* Build knobs */
#define debug_printf_expand(...) do {} while (0)
#define debug_printf_varexp(...) do {} while (0)
#define debug_printf_glob(...) do {} while (0)
+#define debug_printf_redir(...) do {} while (0)
#define debug_printf_list(...) do {} while (0)
#define debug_printf_subst(...) do {} while (0)
#define debug_printf_clean(...) do {} while (0)
static const char o_opt_strings[] ALIGN1 =
"pipefail\0"
"noexec\0"
+ "errexit\0"
#if ENABLE_HUSH_MODE_X
"xtrace\0"
#endif
enum {
OPT_O_PIPEFAIL,
OPT_O_NOEXEC,
+ OPT_O_ERREXIT,
#if ENABLE_HUSH_MODE_X
OPT_O_XTRACE,
#endif
#else
# define G_saved_tty_pgrp 0
#endif
+ /* How deeply are we in context where "set -e" is ignored */
+ int errexit_depth;
+ /* "set -e" rules (do we follow them correctly?):
+ * Exit if pipe, list, or compound command exits with a non-zero status.
+ * Shell does not exit if failed command is part of condition in
+ * if/while, part of && or || list except the last command, any command
+ * in a pipe but the last, or if the command's return value is being
+ * inverted with !. If a compound command other than a subshell returns a
+ * non-zero status because a command failed while -e was being ignored, the
+ * shell does not exit. A trap on ERR, if set, is executed before the shell
+ * exits [ERR is a bashism].
+ *
+ * If a compound command or function executes in a context where -e is
+ * ignored, none of the commands executed within are affected by the -e
+ * setting. If a compound command or function sets -e while executing in a
+ * context where -e is ignored, that setting does not have any effect until
+ * the compound command or the command containing the function call completes.
+ */
+
char o_opt[NUM_OPT_O];
#if ENABLE_HUSH_MODE_X
# define G_x_mode (G.o_opt[OPT_O_XTRACE])
smallint exiting; /* used to prevent EXIT trap recursion */
/* These four support $?, $#, and $1 */
smalluint last_exitcode;
+ smalluint last_bg_pid_exitcode;
#if ENABLE_HUSH_SET
/* are global_argv and global_argv[1..n] malloced? (note: not [0]) */
smalluint global_args_malloced;
#if ENABLE_HUSH_EXPORT
static int builtin_export(char **argv) FAST_FUNC;
#endif
+#if ENABLE_HUSH_READONLY
+static int builtin_readonly(char **argv) FAST_FUNC;
+#endif
#if ENABLE_HUSH_JOB
static int builtin_fg_bg(char **argv) FAST_FUNC;
static int builtin_jobs(char **argv) FAST_FUNC;
BLTIN("export" , builtin_export , "Set environment variables"),
#endif
#if ENABLE_HUSH_JOB
- BLTIN("fg" , builtin_fg_bg , "Bring job into foreground"),
+ BLTIN("fg" , builtin_fg_bg , "Bring job to foreground"),
#endif
#if ENABLE_HUSH_HELP
BLTIN("help" , builtin_help , NULL),
#if ENABLE_HUSH_READ
BLTIN("read" , builtin_read , "Input into variable"),
#endif
+#if ENABLE_HUSH_READONLY
+ BLTIN("readonly" , builtin_readonly, "Make variables read-only"),
+#endif
#if ENABLE_HUSH_FUNCTIONS
BLTIN("return" , builtin_return , "Return from function"),
#endif
BLTIN("unset" , builtin_unset , "Unset variables"),
#endif
#if ENABLE_HUSH_WAIT
- BLTIN("wait" , builtin_wait , "Wait for process"),
+ BLTIN("wait" , builtin_wait , "Wait for process to finish"),
#endif
};
/* These builtins won't be used if we are on NOMMU and need to re-exec
# define DEBUG_GLOB 0
#endif
+#ifndef debug_printf_redir
+# define debug_printf_redir(...) (indent(), fdprintf(2, __VA_ARGS__))
+#endif
+
#ifndef debug_printf_list
# define debug_printf_list(...) (indent(), fdprintf(2, __VA_ARGS__))
#endif
free(strings);
}
+static int fcntl_F_DUPFD(int fd, int avoid_fd)
+{
+ int newfd;
+ repeat:
+ newfd = fcntl(fd, F_DUPFD, avoid_fd + 1);
+ if (newfd < 0) {
+ if (errno == EBUSY)
+ goto repeat;
+ if (errno == EINTR)
+ goto repeat;
+ }
+ return newfd;
+}
-static int xdup_and_close(int fd, int F_DUPFD_maybe_CLOEXEC)
+static int xdup_and_close(int fd, int F_DUPFD_maybe_CLOEXEC, int avoid_fd)
{
- /* We avoid taking stdio fds. Mimicking ash: use fds above 9 */
- int newfd = fcntl(fd, F_DUPFD_maybe_CLOEXEC, 10);
+ int newfd;
+ repeat:
+ newfd = fcntl(fd, F_DUPFD_maybe_CLOEXEC, avoid_fd + 1);
if (newfd < 0) {
+ if (errno == EBUSY)
+ goto repeat;
+ if (errno == EINTR)
+ goto repeat;
/* fd was not open? */
if (errno == EBADF)
return fd;
}
fclose(fp);
}
-static int save_FILEs_on_redirect(int fd)
+static int save_FILEs_on_redirect(int fd, int avoid_fd)
{
struct FILE_list *fl = G.FILE_list;
while (fl) {
if (fd == fl->fd) {
/* We use it only on script files, they are all CLOEXEC */
- fl->fd = xdup_and_close(fd, F_DUPFD_CLOEXEC);
+ fl->fd = xdup_and_close(fd, F_DUPFD_CLOEXEC, avoid_fd);
+ debug_printf_redir("redirect_fd %d: matches a script fd, moving it to %d\n", fd, fl->fd);
return 1;
}
fl = fl->next;
while (fl) {
int should_be = fileno(fl->fp);
if (fl->fd != should_be) {
+ debug_printf_redir("restoring script fd from %d to %d\n", fl->fd, should_be);
xmove_fd(fl->fd, should_be);
fl->fd = should_be;
}
fl = fl->next;
}
}
-#if ENABLE_FEATURE_SH_STANDALONE
+#if ENABLE_FEATURE_SH_STANDALONE && BB_MMU
static void close_all_FILE_list(void)
{
struct FILE_list *fl = G.FILE_list;
static void save_and_replace_G_args(save_arg_t *sv, char **argv)
{
- int n;
-
sv->sv_argv0 = argv[0];
sv->sv_g_argv = G.global_argv;
sv->sv_g_argc = G.global_argc;
G.global_argv = argv;
IF_HUSH_SET(G.global_args_malloced = 0;)
- n = 1;
- while (*++argv)
- n++;
- G.global_argc = n;
+ G.global_argc = 1 + string_array_len(argv + 1);
}
static void restore_G_args(save_arg_t *sv, char **argv)
/* str holds "NAME=VAL" and is expected to be malloced.
* We take ownership of it.
- * flg_export:
- * 0: do not change export flag
- * (if creating new variable, flag will be 0)
- * 1: set export flag and putenv the variable
- * -1: clear export flag and unsetenv the variable
- * flg_read_only is set only when we handle -R var=val
*/
-#if !BB_MMU && ENABLE_HUSH_LOCAL
-/* all params are used */
-#elif BB_MMU && ENABLE_HUSH_LOCAL
-#define set_local_var(str, flg_export, local_lvl, flg_read_only) \
- set_local_var(str, flg_export, local_lvl)
-#elif BB_MMU && !ENABLE_HUSH_LOCAL
-#define set_local_var(str, flg_export, local_lvl, flg_read_only) \
- set_local_var(str, flg_export)
-#elif !BB_MMU && !ENABLE_HUSH_LOCAL
-#define set_local_var(str, flg_export, local_lvl, flg_read_only) \
- set_local_var(str, flg_export, flg_read_only)
-#endif
-static int set_local_var(char *str, int flg_export, int local_lvl, int flg_read_only)
+#define SETFLAG_EXPORT (1 << 0)
+#define SETFLAG_UNEXPORT (1 << 1)
+#define SETFLAG_MAKE_RO (1 << 2)
+#define SETFLAG_LOCAL_SHIFT 3
+static int set_local_var(char *str, unsigned flags)
{
struct variable **var_pp;
struct variable *cur;
char *free_me = NULL;
char *eq_sign;
int name_len;
+ IF_HUSH_LOCAL(unsigned local_lvl = (flags >> SETFLAG_LOCAL_SHIFT);)
eq_sign = strchr(str, '=');
if (!eq_sign) { /* not expected to ever happen? */
/* We found an existing var with this name */
if (cur->flg_read_only) {
-#if !BB_MMU
- if (!flg_read_only)
-#endif
- bb_error_msg("%s: readonly variable", str);
+ bb_error_msg("%s: readonly variable", str);
free(str);
+//NOTE: in bash, assignment in "export READONLY_VAR=Z" fails, and sets $?=1,
+//but export per se succeeds (does put the var in env). We don't mimic that.
return -1;
}
- if (flg_export == -1) { // "&& cur->flg_export" ?
+ if (flags & SETFLAG_UNEXPORT) { // && cur->flg_export ?
debug_printf_env("%s: unsetenv '%s'\n", __func__, str);
*eq_sign = '\0';
unsetenv(str);
* z=z
*/
if (cur->flg_export)
- flg_export = 1;
+ flags |= SETFLAG_EXPORT;
break;
}
#endif
/* Not found - create new variable struct */
cur = xzalloc(sizeof(*cur));
-#if ENABLE_HUSH_LOCAL
- cur->func_nest_level = local_lvl;
-#endif
+ IF_HUSH_LOCAL(cur->func_nest_level = local_lvl;)
cur->next = *var_pp;
*var_pp = cur;
set_str_and_exp:
cur->varstr = str;
-#if !BB_MMU
- cur->flg_read_only = flg_read_only;
-#endif
exp:
- if (flg_export == 1)
+#if !BB_MMU || ENABLE_HUSH_READONLY
+ if (flags & SETFLAG_MAKE_RO) {
+ cur->flg_read_only = 1;
+ }
+#endif
+ if (flags & SETFLAG_EXPORT)
cur->flg_export = 1;
if (name_len == 4 && cur->varstr[0] == 'P' && cur->varstr[1] == 'S')
cmdedit_update_prompt();
if (cur->flg_export) {
- if (flg_export == -1) {
+ if (flags & SETFLAG_UNEXPORT) {
cur->flg_export = 0;
/* unsetenv was already done */
} else {
}
/* Used at startup and after each cd */
-static void set_pwd_var(int exp)
+static void set_pwd_var(unsigned flag)
{
- set_local_var(xasprintf("PWD=%s", get_cwd(/*force:*/ 1)),
- /*exp:*/ exp, /*lvl:*/ 0, /*ro:*/ 0);
+ set_local_var(xasprintf("PWD=%s", get_cwd(/*force:*/ 1)), flag);
}
static int unset_local_var_len(const char *name, int name_len)
static void FAST_FUNC set_local_var_from_halves(const char *name, const char *val)
{
char *var = xasprintf("%s=%s", name, val);
- set_local_var(var, /*flags:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
+ set_local_var(var, /*flag:*/ 0);
}
#endif
if (eq) {
var_pp = get_ptr_to_local_var(*s, eq - *s);
if (var_pp) {
- /* Remove variable from global linked list */
var_p = *var_pp;
+ if (var_p->flg_read_only) {
+ char **p;
+ bb_error_msg("%s: readonly variable", *s);
+ /*
+ * "VAR=V BLTIN" unsets VARs after BLTIN completes.
+ * If VAR is readonly, leaving it in the list
+ * after asssignment error (msg above)
+ * causes doubled error message later, on unset.
+ */
+ debug_printf_env("removing/freeing '%s' element\n", *s);
+ free(*s);
+ p = s;
+ do { *p = p[1]; p++; } while (*p);
+ goto next;
+ }
+ /* Remove variable from global linked list */
debug_printf_env("%s: removing '%s'\n", __func__, var_p->varstr);
*var_pp = var_p->next;
/* Add it to returned list */
var_p->next = old;
old = var_p;
}
- set_local_var(*s, /*exp:*/ 1, /*lvl:*/ 0, /*ro:*/ 0);
+ set_local_var(*s, SETFLAG_EXPORT);
}
+ next:
s++;
}
return old;
static void o_addblock(o_string *o, const char *str, int len)
{
o_grow_by(o, len);
- memcpy(&o->data[o->length], str, len);
+ ((char*)mempcpy(&o->data[o->length], str, len))[0] = '\0';
o->length += len;
- o->data[o->length] = '\0';
}
static void o_addstr(o_string *o, const char *str)
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;
ctx->ctx_inverted = 0;
ctx->pipe->res_word = ctx->ctx_res_w;
#endif
+ if (type == PIPE_BG && ctx->list_head != ctx->pipe) {
+ /* Necessary since && and || have precedence over &:
+ * "cmd1 && cmd2 &" must spawn both cmds, not only cmd2,
+ * in a backgrounded subshell.
+ */
+ struct pipe *pi;
+ struct command *command;
+
+ /* Is this actually this construct, all pipes end with && or ||? */
+ pi = ctx->list_head;
+ while (pi != ctx->pipe) {
+ if (pi->followup != PIPE_AND && pi->followup != PIPE_OR)
+ goto no_conv;
+ pi = pi->next;
+ }
+
+ debug_printf_parse("BG with more than one pipe, converting to { p1 &&...pN; } &\n");
+ pi->followup = PIPE_SEQ; /* close pN _not_ with "&"! */
+ pi = xzalloc(sizeof(*pi));
+ pi->followup = PIPE_BG;
+ pi->num_cmds = 1;
+ pi->cmds = xzalloc(sizeof(pi->cmds[0]));
+ command = &pi->cmds[0];
+ if (CMD_NORMAL != 0) /* "if xzalloc didn't do that already" */
+ command->cmd_type = CMD_NORMAL;
+ command->group = ctx->list_head;
+#if !BB_MMU
+ command->group_as_string = xstrndup(
+ ctx->as_string.data,
+ ctx->as_string.length - 1 /* do not copy last char, "&" */
+ );
+#endif
+ /* Replace all pipes in ctx with one newly created */
+ ctx->list_head = ctx->pipe = pi;
+ } else {
+ no_conv:
+ ctx->pipe->followup = type;
+ }
/* Without this check, even just <enter> on command line generates
* tree of three NOPs (!). Which is harmless but annoying.
if (r->flag & FLAG_START) {
struct parse_context *old;
- old = xmalloc(sizeof(*old));
+ old = xmemdup(ctx, sizeof(*ctx));
debug_printf_parse("push stack %p\n", old);
- *old = *ctx; /* physical copy */
initialize_context(ctx);
ctx->stack = old;
} else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) {
* Really, ask yourself, why
* "cmd && <newline>" doesn't start
* cmd but waits for more input?
- * No reason...)
+ * The only reason is that it might be
+ * a "cmd1 && <nl> cmd2 &" construct,
+ * cmd1 may need to run in BG).
*/
struct pipe *pi = ctx.list_head;
if (pi->num_cmds != 0 /* check #1 */
* and it will match } earlier (not here). */
syntax_error_unexpected_ch(ch);
G.last_exitcode = 2;
- goto parse_error1;
+ goto parse_error2;
default:
if (HUSH_DEBUG)
bb_error_msg_and_die("BUG: unexpected %c\n", ch);
parse_error:
G.last_exitcode = 1;
- parse_error1:
+ parse_error2:
{
struct parse_context *pctx;
IF_HAS_KEYWORDS(struct parse_context *p2;)
/*** Execution routines ***/
/* Expansion can recurse, need forward decls: */
-#if !BASH_PATTERN_SUBST
+#if !BASH_PATTERN_SUBST && !ENABLE_HUSH_CASE
/* only ${var/pattern/repl} (its pattern part) needs additional mode */
#define expand_string_to_string(str, do_unbackslash) \
expand_string_to_string(str)
#endif
static char *encode_then_expand_string(const char *str, int process_bkslash, int do_unbackslash)
{
+#if !BASH_PATTERN_SUBST
+ const int do_unbackslash = 1;
+#endif
char *exp_str;
struct in_str input;
o_string dest = NULL_O_STRING;
break;
result = xrealloc(result, res_len + (s - val) + repl_len + 1);
- memcpy(result + res_len, val, s - val);
- res_len += s - val;
- strcpy(result + res_len, repl);
- res_len += repl_len;
+ strcpy(mempcpy(result + res_len, val, s - val), repl);
+ res_len += (s - val) + repl_len;
debug_printf_varexp("val:'%s' s:'%s' result:'%s'\n", val, s, result);
val = s + size;
if (exp_op == '/')
break;
}
- if (val[0] && result) {
+ if (*val && result) {
result = xrealloc(result, res_len + strlen(val) + 1);
strcpy(result + res_len, val);
debug_printf_varexp("val:'%s' result:'%s'\n", val, result);
first_char = arg[0] = arg0 & 0x7f;
exp_op = 0;
- if (first_char == '#' /* ${#... */
- && arg[1] && !exp_saveptr /* not ${#} and not ${#<op_char>...} */
+ if (first_char == '#' && arg[1] /* ${#... but not ${#} */
+ && (!exp_saveptr /* and (not ${#<op_char>...} */
+ || (arg[1] == '?' && arg[2] == '\0') /* or ${#?} - "len of $?") */
+ )
) {
/* It must be length operator: ${#var} */
var++;
if (errmsg)
goto arith_err;
debug_printf_varexp("len:'%s'=%lld\n", exp_word, (long long)len);
- if (len >= 0) { /* bash compat: len < 0 is illegal */
- if (beg < 0) /* bash compat */
- beg = 0;
- debug_printf_varexp("from val:'%s'\n", val);
- if (len == 0 || !val || beg >= strlen(val)) {
+ if (beg < 0) {
+ /* negative beg counts from the end */
+ beg = (arith_t)strlen(val) + beg;
+ if (beg < 0) /* ${v: -999999} is "" */
+ beg = len = 0;
+ }
+ debug_printf_varexp("from val:'%s'\n", val);
+ if (len < 0) {
+ /* in bash, len=-n means strlen()-n */
+ len = (arith_t)strlen(val) - beg + len;
+ if (len < 0) /* bash compat */
+ die_if_script("%s: substring expression < 0", var);
+ }
+ if (len <= 0 || !val || beg >= strlen(val)) {
arith_err:
- val = NULL;
- } else {
- /* Paranoia. What if user entered 9999999999999
- * which fits in arith_t but not int? */
- if (len >= INT_MAX)
- len = INT_MAX;
- val = to_be_freed = xstrndup(val + beg, len);
- }
- debug_printf_varexp("val:'%s'\n", val);
- } else
-#endif /* HUSH_SUBSTR_EXPANSION && FEATURE_SH_MATH */
- {
- die_if_script("malformed ${%s:...}", var);
val = NULL;
+ } else {
+ /* Paranoia. What if user entered 9999999999999
+ * which fits in arith_t but not int? */
+ if (len >= INT_MAX)
+ len = INT_MAX;
+ val = to_be_freed = xstrndup(val + beg, len);
}
+ debug_printf_varexp("val:'%s'\n", val);
+#else /* not (HUSH_SUBSTR_EXPANSION && FEATURE_SH_MATH) */
+ die_if_script("malformed ${%s:...}", var);
+ val = NULL;
+#endif
} else { /* one of "-=+?" */
/* Standard-mandated substitution ops:
* ${var?word} - indicate error if unset
/* mimic bash message */
die_if_script("%s: %s",
var,
- exp_word[0] ? exp_word : "parameter null or not set"
+ exp_word[0]
+ ? exp_word
+ : "parameter null or not set"
+ /* ash has more specific messages, a-la: */
+ /*: (exp_save == ':' ? "parameter null or not set" : "parameter not set")*/
);
//TODO: how interactive bash aborts expansion mid-command?
} else {
val = NULL;
} else {
char *new_var = xasprintf("%s=%s", var, val);
- set_local_var(new_var, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
+ set_local_var(new_var, /*flag:*/ 0);
}
}
}
*/
static char *expand_string_to_string(const char *str, int do_unbackslash)
{
-#if !BASH_PATTERN_SUBST
+#if !BASH_PATTERN_SUBST && !ENABLE_HUSH_CASE
const int do_unbackslash = 1;
#endif
char *argv[2], **list;
return (char*)list;
}
-/* Used for "eval" builtin */
+/* Used for "eval" builtin and case string */
static char* expand_strvec_to_string(char **argv)
{
char **list;
wait(NULL); /* wait till child has died */
}
-/* fd: redirect wants this fd to be used (e.g. 3>file).
- * Move all conflicting internally used fds,
- * and remember them so that we can restore them later.
- */
-static int save_fds_on_redirect(int fd, int squirrel[3])
+struct squirrel {
+ int orig_fd;
+ int moved_to;
+ /* moved_to = n: fd was moved to n; restore back to orig_fd after redir */
+ /* moved_to = -1: fd was opened by redirect; close orig_fd after redir */
+};
+
+static struct squirrel *append_squirrel(struct squirrel *sq, int i, int orig, int moved)
{
- if (squirrel) {
- /* Handle redirects of fds 0,1,2 */
+ sq = xrealloc(sq, (i + 2) * sizeof(sq[0]));
+ sq[i].orig_fd = orig;
+ sq[i].moved_to = moved;
+ sq[i+1].orig_fd = -1; /* end marker */
+ return sq;
+}
- /* If we collide with an already moved stdio fd... */
- if (fd == squirrel[0]) {
- squirrel[0] = xdup_and_close(squirrel[0], F_DUPFD);
- return 1;
- }
- if (fd == squirrel[1]) {
- squirrel[1] = xdup_and_close(squirrel[1], F_DUPFD);
- return 1;
- }
- if (fd == squirrel[2]) {
- squirrel[2] = xdup_and_close(squirrel[2], F_DUPFD);
- return 1;
- }
- /* If we are about to redirect stdio fd, and did not yet move it... */
- if (fd <= 2 && squirrel[fd] < 0) {
- /* We avoid taking stdio fds */
- squirrel[fd] = fcntl(fd, F_DUPFD, 10);
- if (squirrel[fd] < 0 && errno != EBADF)
+static struct squirrel *add_squirrel(struct squirrel *sq, int fd, int avoid_fd)
+{
+ int moved_to;
+ int i = 0;
+
+ if (sq) while (sq[i].orig_fd >= 0) {
+ /* If we collide with an already moved fd... */
+ if (fd == sq[i].moved_to) {
+ sq[i].moved_to = fcntl_F_DUPFD(sq[i].moved_to, avoid_fd);
+ debug_printf_redir("redirect_fd %d: already busy, moving to %d\n", fd, sq[i].moved_to);
+ if (sq[i].moved_to < 0) /* what? */
xfunc_die();
- return 0; /* "we did not close fd" */
+ return sq;
}
+ if (fd == sq[i].orig_fd) {
+ /* Example: echo Hello >/dev/null 1>&2 */
+ debug_printf_redir("redirect_fd %d: already moved\n", fd);
+ return sq;
+ }
+ i++;
}
+ /* If this fd is open, we move and remember it; if it's closed, moved_to = -1 */
+ moved_to = fcntl_F_DUPFD(fd, avoid_fd);
+ debug_printf_redir("redirect_fd %d: previous fd is moved to %d (-1 if it was closed)\n", fd, moved_to);
+ if (moved_to < 0 && errno != EBADF)
+ xfunc_die();
+ return append_squirrel(sq, i, fd, moved_to);
+}
+
+/* fd: redirect wants this fd to be used (e.g. 3>file).
+ * Move all conflicting internally used fds,
+ * and remember them so that we can restore them later.
+ */
+static int save_fds_on_redirect(int fd, int avoid_fd, struct squirrel **sqp)
+{
+ if (avoid_fd < 9) /* the important case here is that it can be -1 */
+ avoid_fd = 9;
+
#if ENABLE_HUSH_INTERACTIVE
if (fd != 0 && fd == G.interactive_fd) {
- G.interactive_fd = xdup_and_close(G.interactive_fd, F_DUPFD_CLOEXEC);
- return 1;
+ G.interactive_fd = xdup_and_close(G.interactive_fd, F_DUPFD_CLOEXEC, avoid_fd);
+ debug_printf_redir("redirect_fd %d: matches interactive_fd, moving it to %d\n", fd, G.interactive_fd);
+ return 1; /* "we closed fd" */
}
#endif
-
/* Are we called from setup_redirects(squirrel==NULL)? Two cases:
* (1) Redirect in a forked child. No need to save FILEs' fds,
* we aren't going to use them anymore, ok to trash.
- * (2) "exec 3>FILE". Bummer. We can save FILEs' fds,
- * but how are we doing to use them?
+ * (2) "exec 3>FILE". Bummer. We can save script FILEs' fds,
+ * but how are we doing to restore them?
* "fileno(fd) = new_fd" can't be done.
*/
- if (!squirrel)
+ if (!sqp)
return 0;
- return save_FILEs_on_redirect(fd);
+ /* If this one of script's fds? */
+ if (save_FILEs_on_redirect(fd, avoid_fd))
+ return 1; /* yes. "we closed fd" */
+
+ /* Check whether it collides with any open fds (e.g. stdio), save fds as needed */
+ *sqp = add_squirrel(*sqp, fd, avoid_fd);
+ return 0; /* "we did not close fd" */
}
-static void restore_redirects(int squirrel[3])
+static void restore_redirects(struct squirrel *sq)
{
- int i, fd;
- for (i = 0; i <= 2; i++) {
- fd = squirrel[i];
- if (fd != -1) {
- /* We simply die on error */
- xmove_fd(fd, i);
+
+ if (sq) {
+ int i = 0;
+ while (sq[i].orig_fd >= 0) {
+ if (sq[i].moved_to >= 0) {
+ /* We simply die on error */
+ debug_printf_redir("restoring redirected fd from %d to %d\n", sq[i].moved_to, sq[i].orig_fd);
+ xmove_fd(sq[i].moved_to, sq[i].orig_fd);
+ } else {
+ /* cmd1 9>FILE; cmd2_should_see_fd9_closed */
+ debug_printf_redir("restoring redirected fd %d: closing it\n", sq[i].orig_fd);
+ close(sq[i].orig_fd);
+ }
+ i++;
}
+ free(sq);
}
- /* Moved G.interactive_fd stays on new fd, not doing anything for it */
+ /* If moved, G.interactive_fd stays on new fd, not restoring it */
restore_redirected_FILEs();
}
/* 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[])
+static int setup_redirects(struct command *prog, struct squirrel **sqp)
{
int openfd, mode;
struct redir_struct *redir;
for (redir = prog->redirects; redir; redir = redir->next) {
if (redir->rd_type == REDIRECT_HEREDOC2) {
/* "rd_fd<<HERE" case */
- save_fds_on_redirect(redir->rd_fd, squirrel);
+ save_fds_on_redirect(redir->rd_fd, /*avoid:*/ 0, sqp);
/* for REDIRECT_HEREDOC2, rd_filename holds _contents_
* of the heredoc */
debug_printf_parse("set heredoc '%s'\n",
*/
return 1;
}
+ if (openfd == redir->rd_fd && sqp) {
+ /* open() gave us precisely the fd we wanted.
+ * This means that this fd was not busy
+ * (not opened to anywhere).
+ * Remember to close it on restore:
+ */
+ struct squirrel *sq = *sqp;
+ int i = 0;
+ if (sq) while (sq[i].orig_fd >= 0)
+ i++;
+ *sqp = append_squirrel(sq, i, openfd, -1); /* -1 = "it was closed" */
+ debug_printf_redir("redir to previously closed fd %d\n", openfd);
+ }
} else {
/* "rd_fd<*>rd_dup" or "rd_fd<*>-" cases */
openfd = redir->rd_dup;
}
if (openfd != redir->rd_fd) {
- int closed = save_fds_on_redirect(redir->rd_fd, squirrel);
+ int closed = save_fds_on_redirect(redir->rd_fd, /*avoid:*/ openfd, sqp);
if (openfd == REDIRFD_CLOSE) {
/* "rd_fd >&-" means "close me" */
if (!closed) {
char **argv)
{
# if BB_MMU
- int n = 1;
+ int n;
argv[0] = G.global_argv[0];
G.global_argv = argv;
- while (*++argv)
- n++;
- G.global_argc = n;
+ G.global_argc = n = 1 + string_array_len(argv + 1);
/* On MMU, funcp->body is always non-NULL */
n = run_list(funcp->body);
fflush_all();
/* Do not leak open fds from opened script files etc */
close_all_FILE_list();
debug_printf_exec("running applet '%s'\n", argv[0]);
- run_applet_no_and_exit(a, argv);
+ run_applet_no_and_exit(a, argv[0], argv);
}
# endif
/* Re-exec ourselves */
return pi->cmdtext;
}
-static void insert_bg_job(struct pipe *pi)
+static void remove_job_from_table(struct pipe *pi)
+{
+ 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;
+ }
+ G.last_jobid = 0;
+ if (G.job_list)
+ G.last_jobid = G.job_list->jobid;
+}
+
+static void delete_finished_job(struct pipe *pi)
+{
+ remove_job_from_table(pi);
+ free_pipe(pi);
+}
+
+static void clean_up_last_dead_job(void)
+{
+ if (G.job_list && !G.job_list->alive_cmds)
+ delete_finished_job(G.job_list);
+}
+
+static void insert_job_into_table(struct pipe *pi)
{
struct pipe *job, **jobp;
int i;
- /* Linear search for the ID of the job to use */
- pi->jobid = 1;
- for (job = G.job_list; job; job = job->next)
- if (job->jobid >= pi->jobid)
- pi->jobid = job->jobid + 1;
+ clean_up_last_dead_job();
- /* Add job to the list of running jobs */
+ /* Find the end of the list, and find next job ID to use */
+ i = 0;
jobp = &G.job_list;
- while ((job = *jobp) != NULL)
+ while ((job = *jobp) != NULL) {
+ if (job->jobid > i)
+ i = job->jobid;
jobp = &job->next;
- job = *jobp = xmalloc(sizeof(*job));
+ }
+ pi->jobid = i + 1;
- *job = *pi; /* physical copy */
+ /* Create a new job struct at the end */
+ job = *jobp = xmemdup(pi, sizeof(*pi));
job->next = NULL;
job->cmds = xzalloc(sizeof(pi->cmds[0]) * pi->num_cmds);
/* Cannot copy entire pi->cmds[] vector! This causes double frees */
printf("[%u] %u %s\n", job->jobid, (unsigned)job->cmds[0].pid, job->cmdtext);
G.last_jobid = job->jobid;
}
-
-static void remove_bg_job(struct pipe *pi)
-{
- 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;
- }
- if (G.job_list)
- G.last_jobid = G.job_list->jobid;
- else
- G.last_jobid = 0;
-}
-
-/* Remove a backgrounded job */
-static void delete_finished_bg_job(struct pipe *pi)
-{
- remove_bg_job(pi);
- free_pipe(pi);
-}
#endif /* JOB */
static int job_exited_or_stopped(struct pipe *pi)
if (G_interactive_fd) {
#if ENABLE_HUSH_JOB
if (fg_pipe->alive_cmds != 0)
- insert_bg_job(fg_pipe);
+ insert_job_into_table(fg_pipe);
#endif
return rcode;
}
found_pi_and_prognum:
if (dead) {
/* child exited */
- pi->cmds[i].pid = 0;
- pi->cmds[i].cmd_exitcode = WEXITSTATUS(status);
+ int rcode = WEXITSTATUS(status);
if (WIFSIGNALED(status))
- pi->cmds[i].cmd_exitcode = 128 + WTERMSIG(status);
+ rcode = 128 + WTERMSIG(status);
+ pi->cmds[i].cmd_exitcode = rcode;
+ if (G.last_bg_pid == pi->cmds[i].pid)
+ G.last_bg_pid_exitcode = rcode;
+ pi->cmds[i].pid = 0;
pi->alive_cmds--;
if (!pi->alive_cmds) {
- if (G_interactive_fd)
+ if (G_interactive_fd) {
printf(JOB_STATUS_FORMAT, pi->jobid,
"Done", pi->cmdtext);
- delete_finished_bg_job(pi);
+ delete_finished_job(pi);
+ } else {
+/*
+ * bash deletes finished jobs from job table only in interactive mode,
+ * after "jobs" cmd, or if pid of a new process matches one of the old ones
+ * (see cleanup_dead_jobs(), delete_old_job(), J_NOTIFIED in bash source).
+ * Testcase script: "(exit 3) & sleep 1; wait %1; echo $?" prints 3 in bash.
+ * We only retain one "dead" job, if it's the single job on the list.
+ * This covers most of real-world scenarios where this is useful.
+ */
+ if (pi != G.job_list)
+ delete_finished_job(pi);
+ }
}
} else {
/* child stopped */
static int redirect_and_varexp_helper(char ***new_env_p,
struct variable **old_vars_p,
struct command *command,
- int squirrel[3],
+ struct squirrel **sqp,
char **argv_expanded)
{
/* 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. */
- int rcode = setup_redirects(command, squirrel);
+ int rcode = setup_redirects(command, sqp);
if (rcode == 0) {
char **new_env = expand_assignments(command->argv, command->assignment_cnt);
*new_env_p = new_env;
struct command *command;
char **argv_expanded;
char **argv;
- /* it is not always needed, but we aim to smaller code */
- int squirrel[] = { -1, -1, -1 };
+ struct squirrel *squirrel = NULL;
int rcode;
debug_printf_exec("run_pipe start: members:%d\n", pi->num_cmds);
/* { list } */
debug_printf("non-subshell group\n");
rcode = 1; /* exitcode if redir failed */
- if (setup_redirects(command, squirrel) == 0) {
+ if (setup_redirects(command, &squirrel) == 0) {
debug_printf_exec(": run_list\n");
rcode = run_list(command->group) & 0xff;
}
/* Ensure redirects take effect (that is, create files).
* Try "a=t >file" */
#if 0 /* A few cases in testsuite fail with this code. FIXME */
- rcode = redirect_and_varexp_helper(&new_env, /*old_vars:*/ NULL, command, squirrel, /*argv_expanded:*/ NULL);
+ rcode = redirect_and_varexp_helper(&new_env, /*old_vars:*/ NULL, command, &squirrel, /*argv_expanded:*/ NULL);
/* Set shell variables */
if (new_env) {
argv = new_env;
while (*argv) {
- set_local_var(*argv, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
- /* Do we need to flag set_local_var() errors?
- * "assignment to readonly var" and "putenv error"
- */
+ if (set_local_var(*argv, /*flag:*/ 0)) {
+ /* assignment to readonly var / putenv error? */
+ rcode = 1;
+ }
argv++;
}
}
#else /* Older, bigger, but more correct code */
- rcode = setup_redirects(command, squirrel);
+ rcode = setup_redirects(command, &squirrel);
restore_redirects(squirrel);
/* Set shell variables */
if (G_x_mode)
fprintf(stderr, " %s", p);
debug_printf_exec("set shell var:'%s'->'%s'\n",
*argv, p);
- set_local_var(p, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
- /* Do we need to flag set_local_var() errors?
- * "assignment to readonly var" and "putenv error"
- */
+ if (set_local_var(p, /*flag:*/ 0)) {
+ /* assignment to readonly var / putenv error? */
+ rcode = 1;
+ }
argv++;
}
if (G_x_mode)
goto clean_up_and_ret1;
}
}
- rcode = redirect_and_varexp_helper(&new_env, &old_vars, command, squirrel, argv_expanded);
+ rcode = redirect_and_varexp_helper(&new_env, &old_vars, command, &squirrel, argv_expanded);
if (rcode == 0) {
if (!funcp) {
debug_printf_exec(": builtin '%s' '%s'...\n",
if (ENABLE_FEATURE_SH_NOFORK) {
int n = find_applet_by_name(argv_expanded[0]);
if (n >= 0 && APPLET_IS_NOFORK(n)) {
- rcode = redirect_and_varexp_helper(&new_env, &old_vars, command, squirrel, argv_expanded);
+ rcode = redirect_and_varexp_helper(&new_env, &old_vars, command, &squirrel, argv_expanded);
if (rcode == 0) {
debug_printf_exec(": run_nofork_applet '%s' '%s'...\n",
argv_expanded[0], argv_expanded[1]);
/* Go through list of pipes, (maybe) executing them. */
for (; pi; pi = IF_HUSH_LOOPS(rword == RES_DONE ? loop_top : ) pi->next) {
int r;
+ int sv_errexit_depth;
if (G.flag_SIGINT)
break;
IF_HAS_KEYWORDS(rword = pi->res_word;)
debug_printf_exec(": rword=%d cond_code=%d last_rword=%d\n",
rword, cond_code, last_rword);
+
+ sv_errexit_depth = G.errexit_depth;
+ if (IF_HAS_KEYWORDS(rword == RES_IF || rword == RES_ELIF ||)
+ pi->followup != PIPE_SEQ
+ ) {
+ G.errexit_depth++;
+ }
#if ENABLE_HUSH_LOOPS
if ((rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR)
&& loop_top == NULL /* avoid bumping G.depth_of_loop twice */
}
/* Insert next value from for_lcur */
/* note: *for_lcur already has quotes removed, $var expanded, etc */
- set_local_var(xasprintf("%s=%s", pi->cmds[0].argv[0], *for_lcur++), /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
+ set_local_var(xasprintf("%s=%s", pi->cmds[0].argv[0], *for_lcur++), /*flag:*/ 0);
continue;
}
if (rword == RES_IN) {
if (rword == RES_CASE) {
debug_printf_exec("CASE cond_code:%d\n", cond_code);
case_word = expand_strvec_to_string(pi->cmds->argv);
+ unbackslash(case_word);
continue;
}
if (rword == RES_MATCH) {
/* all prev words didn't match, does this one match? */
argv = pi->cmds->argv;
while (*argv) {
- char *pattern = expand_string_to_string(*argv, /*unbackslash:*/ 1);
+ char *pattern = expand_string_to_string(*argv, /*unbackslash:*/ 0);
/* TODO: which FNM_xxx flags to use? */
cond_code = (fnmatch(pattern, case_word, /*flags:*/ 0) != 0);
+ debug_printf_exec("fnmatch(pattern:'%s',str:'%s'):%d\n", pattern, case_word, cond_code);
free(pattern);
if (cond_code == 0) { /* match! we will execute this branch */
free(case_word);
* I'm NOT treating inner &'s as jobs */
#if ENABLE_HUSH_JOB
if (G.run_list_level == 1)
- insert_bg_job(pi);
+ insert_job_into_table(pi);
#endif
/* Last command's pid goes to $! */
G.last_bg_pid = pi->cmds[pi->num_cmds - 1].pid;
+ G.last_bg_pid_exitcode = 0;
debug_printf_exec(": cmd&: exitcode EXIT_SUCCESS\n");
/* Check pi->pi_inverted? "! sleep 1 & echo $?": bash says 1. dash and ash says 0 */
rcode = EXIT_SUCCESS;
check_and_run_traps();
}
+ /* Handle "set -e" */
+ if (rcode != 0 && G.o_opt[OPT_O_ERREXIT]) {
+ debug_printf_exec("ERREXIT:1 errexit_depth:%d\n", G.errexit_depth);
+ if (G.errexit_depth == 0)
+ hush_exit(rcode);
+ }
+ G.errexit_depth = sv_errexit_depth;
+
/* Analyze how result affects subsequent commands */
#if ENABLE_HUSH_IF
if (rword == RES_IF || rword == RES_ELIF)
G.o_opt[idx] = state;
break;
}
+ case 'e':
+ G.o_opt[OPT_O_ERREXIT] = state;
+ break;
default:
return EXIT_FAILURE;
}
putenv(shell_ver->varstr);
/* Export PWD */
- set_pwd_var(/*exp:*/ 1);
+ set_pwd_var(SETFLAG_EXPORT);
#if BASH_HOSTNAME_VAR
/* Set (but not export) HOSTNAME unless already set */
flags = (argv[0] && argv[0][0] == '-') ? OPT_login : 0;
builtin_argc = 0;
while (1) {
- opt = getopt(argc, argv, "+c:xinsl"
+ opt = getopt(argc, argv, "+c:exinsl"
#if !BB_MMU
"<:$:R:V:"
# if ENABLE_HUSH_FUNCTIONS
optarg++;
empty_trap_mask = bb_strtoull(optarg, &optarg, 16);
if (empty_trap_mask != 0) {
- int sig;
+ IF_HUSH_TRAP(int sig;)
install_special_sighandlers();
+# if ENABLE_HUSH_TRAP
G_traps = xzalloc(sizeof(G_traps[0]) * NSIG);
for (sig = 1; sig < NSIG; sig++) {
if (empty_trap_mask & (1LL << sig)) {
install_sighandler(sig, SIG_IGN);
}
}
+# endif
}
# if ENABLE_HUSH_LOOPS
optarg++;
}
case 'R':
case 'V':
- set_local_var(xstrdup(optarg), /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ opt == 'R');
+ set_local_var(xstrdup(optarg), opt == 'R' ? SETFLAG_MAKE_RO : 0);
break;
# if ENABLE_HUSH_FUNCTIONS
case 'F': {
#endif
case 'n':
case 'x':
+ case 'e':
if (set_mode(1, opt, NULL) == 0) /* no error */
break;
default:
G_saved_tty_pgrp = 0;
/* try to dup stdin to high fd#, >= 255 */
- G_interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
+ G_interactive_fd = fcntl_F_DUPFD(STDIN_FILENO, 254);
if (G_interactive_fd < 0) {
/* try to dup to any fd */
G_interactive_fd = dup(STDIN_FILENO);
#elif ENABLE_HUSH_INTERACTIVE
/* No job control compiled in, only prompt/line editing */
if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
- G_interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
+ G_interactive_fd = fcntl_F_DUPFD(STDIN_FILENO, 254);
if (G_interactive_fd < 0) {
/* try to dup to any fd */
G_interactive_fd = dup(STDIN_FILENO);
}
-#if ENABLE_MSH
-int msh_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int msh_main(int argc, char **argv)
-{
- bb_error_msg("msh is deprecated, please use hush instead");
- return hush_main(argc, argv);
-}
-#endif
-
-
/*
* Built-ins
*/
#if ENABLE_HUSH_TEST || ENABLE_HUSH_ECHO || ENABLE_HUSH_PRINTF || ENABLE_HUSH_KILL
static int run_applet_main(char **argv, int (*applet_main_func)(int argc, char **argv))
{
- int argc = 0;
- while (*argv) {
- argc++;
- argv++;
- }
- return applet_main_func(argc, argv - argc);
+ int argc = string_array_len(argv);
+ return applet_main_func(argc, argv);
}
#endif
#if ENABLE_HUSH_TEST || BASH_TEST2
* Note: do not enforce exporting. If PWD was unset or unexported,
* set it again, but do not export. bash does the same.
*/
- set_pwd_var(/*exp:*/ 0);
+ set_pwd_var(/*flag:*/ 0);
return EXIT_SUCCESS;
}
* - terminates shell (regardless of interactivity);
* if it has non-empty trap:
* - executes trap and returns to read;
+ * SIGCHLD from children:
+ * - does not interrupt read regardless of interactivity:
+ * try: sleep 1 & read x; echo $x
*/
static int FAST_FUNC builtin_read(char **argv)
{
if ((uintptr_t)r == 1 && errno == EINTR) {
unsigned sig = check_and_run_traps();
- if (sig && sig != SIGINT)
+ if (sig != SIGINT)
goto again;
}
}
#endif
-#if ENABLE_HUSH_EXPORT || ENABLE_HUSH_LOCAL
-# if !ENABLE_HUSH_LOCAL
-#define helper_export_local(argv, exp, lvl) \
- helper_export_local(argv, exp)
-# endif
-static void helper_export_local(char **argv, int exp, int lvl)
+#if ENABLE_HUSH_EXPORT || ENABLE_HUSH_LOCAL || ENABLE_HUSH_READONLY
+static int helper_export_local(char **argv, unsigned flags)
{
do {
char *name = *argv;
vpp = get_ptr_to_local_var(name, name_end - name);
var = vpp ? *vpp : NULL;
- if (exp == -1) { /* unexporting? */
+ if (flags & SETFLAG_UNEXPORT) {
/* export -n NAME (without =VALUE) */
if (var) {
var->flg_export = 0;
} /* else: export -n NOT_EXISTING_VAR: no-op */
continue;
}
- if (exp == 1) { /* exporting? */
+ if (flags & SETFLAG_EXPORT) {
/* export NAME (without =VALUE) */
if (var) {
var->flg_export = 1;
continue;
}
}
+ if (flags & SETFLAG_MAKE_RO) {
+ /* readonly NAME (without =VALUE) */
+ if (var) {
+ var->flg_read_only = 1;
+ continue;
+ }
+ }
# if ENABLE_HUSH_LOCAL
- if (exp == 0 /* local? */
- && var && var->func_nest_level == lvl
- ) {
- /* "local x=abc; ...; local x" - ignore second local decl */
- continue;
+ /* Is this "local" bltin? */
+ if (!(flags & (SETFLAG_EXPORT|SETFLAG_UNEXPORT|SETFLAG_MAKE_RO))) {
+ unsigned lvl = flags >> SETFLAG_LOCAL_SHIFT;
+ if (var && var->func_nest_level == lvl) {
+ /* "local x=abc; ...; local x" - ignore second local decl */
+ continue;
+ }
}
# endif
/* Exporting non-existing variable.
* bash does not put it in environment,
* but remembers that it is exported,
* and does put it in env when it is set later.
- * We just set it to "" and export. */
+ * We just set it to "" and export.
+ */
/* Or, it's "local NAME" (without =VALUE).
- * bash sets the value to "". */
+ * bash sets the value to "".
+ */
+ /* Or, it's "readonly NAME" (without =VALUE).
+ * bash remembers NAME and disallows its creation
+ * in the future.
+ */
name = xasprintf("%s=", name);
} else {
/* (Un)exporting/making local NAME=VALUE */
name = xstrdup(name);
}
- set_local_var(name, /*exp:*/ exp, /*lvl:*/ lvl, /*ro:*/ 0);
+ if (set_local_var(name, flags))
+ return EXIT_FAILURE;
} while (*++argv);
+ return EXIT_SUCCESS;
}
#endif
return EXIT_SUCCESS;
}
- helper_export_local(argv, (opt_unexport ? -1 : 1), 0);
-
- return EXIT_SUCCESS;
+ return helper_export_local(argv, opt_unexport ? SETFLAG_UNEXPORT : SETFLAG_EXPORT);
}
#endif
bb_error_msg("%s: not in a function", argv[0]);
return EXIT_FAILURE; /* bash compat */
}
- helper_export_local(argv, 0, G.func_nest_level);
- return EXIT_SUCCESS;
+ argv++;
+ return helper_export_local(argv, G.func_nest_level << SETFLAG_LOCAL_SHIFT);
+}
+#endif
+
+#if ENABLE_HUSH_READONLY
+static int FAST_FUNC builtin_readonly(char **argv)
+{
+ argv++;
+ if (*argv == NULL) {
+ /* bash: readonly [-p]: list all readonly VARs
+ * (-p has no effect in bash)
+ */
+ struct variable *e;
+ for (e = G.top_var; e; e = e->next) {
+ if (e->flg_read_only) {
+//TODO: quote value: readonly VAR='VAL'
+ printf("readonly %s\n", e->varstr);
+ }
+ }
+ return EXIT_SUCCESS;
+ }
+ return helper_export_local(argv, SETFLAG_MAKE_RO);
}
#endif
/* 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;
+ G.global_argc = 1 + string_array_len(pp + 1);
return EXIT_SUCCESS;
int n = 1;
argv = skip_dash_dash(argv);
if (argv[0]) {
- n = atoi(argv[0]);
+ n = bb_strtou(argv[0], NULL, 10);
+ if (errno || n < 0) {
+ /* shared string with ash.c */
+ bb_error_msg("Illegal number: %s", argv[0]);
+ /*
+ * ash aborts in this case.
+ * bash prints error message and set $? to 1.
+ * Interestingly, for "shift 99999" bash does not
+ * print error message, but does set $? to 1
+ * (and does no shifting at all).
+ */
+ }
}
if (n >= 0 && n < G.global_argc) {
if (G_global_args_malloced) {
sighandler_t handler;
sig = get_signum(*argv++);
- if (sig < 0 || sig >= NSIG) {
+ if (sig < 0) {
ret = EXIT_FAILURE;
/* Mimic bash message exactly */
- bb_perror_msg("trap: %s: invalid signal specification", argv[-1]);
+ bb_error_msg("trap: %s: invalid signal specification", argv[-1]);
continue;
}
printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext);
}
+
+ clean_up_last_dead_job();
+
return EXIT_SUCCESS;
}
i = kill(- pi->pgrp, SIGCONT);
if (i < 0) {
if (errno == ESRCH) {
- delete_finished_bg_job(pi);
+ delete_finished_job(pi);
return EXIT_SUCCESS;
}
bb_perror_msg("kill (SIGCONT)");
}
if (argv[0][0] == 'f') {
- remove_bg_job(pi);
+ remove_job_from_table(pi); /* FG job shouldn't be in job table */
return checkjobs_and_fg_shell(pi);
}
return EXIT_SUCCESS;
wait_pipe = parse_jobspec(*argv);
if (wait_pipe) {
ret = job_exited_or_stopped(wait_pipe);
- if (ret < 0)
+ if (ret < 0) {
ret = wait_for_child_or_signal(wait_pipe, 0);
+ } else {
+ /* waiting on "last dead job" removes it */
+ clean_up_last_dead_job();
+ }
}
/* else: parse_jobspec() already emitted error msg */
continue;
ret = waitpid(pid, &status, WNOHANG);
if (ret < 0) {
/* No */
+ ret = 127;
if (errno == ECHILD) {
- if (G.last_bg_pid > 0 && pid == G.last_bg_pid) {
+ if (pid == G.last_bg_pid) {
/* "wait $!" but last bg task has already exited. Try:
* (sleep 1; exit 3) & sleep 2; echo $?; wait $!; echo $?
* In bash it prints exitcode 0, then 3.
* In dash, it is 127.
*/
- /* ret = G.last_bg_pid_exitstatus - FIXME */
+ ret = G.last_bg_pid_exitcode;
} else {
/* Example: "wait 1". mimic bash message */
bb_error_msg("wait: pid %d is not a child of this shell", (int)pid);
/* ??? */
bb_perror_msg("wait %s", *argv);
}
- ret = 127;
continue; /* bash checks all argv[] */
}
if (ret == 0) {
projects / oweals / busybox.git / blobdiff