/* vi: set sw=4 ts=4: */
/*
- * BusyBox Shell
+ * lash -- the BusyBox Lame-Ass SHell
*
* Copyright (C) 2000 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <unistd.h>
+#ifdef BB_FEATURE_SH_COMMAND_EDITING
+#include "cmdedit.h"
+#endif
-
-#define MAX_COMMAND_LEN 250 /* max length of a single command
- string */
+#define MAX_READ 128 /* size of input buffer for `read' builtin */
#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
-enum redirectionType { REDIRECT_INPUT, REDIRECT_OVERWRITE, REDIRECT_APPEND };
+
+enum redirectionType { REDIRECT_INPUT, REDIRECT_OVERWRITE,
+ REDIRECT_APPEND
+};
struct jobSet {
- struct job * head; /* head of list of running jobs */
- struct job * fg; /* current foreground job */
+ struct job *head; /* head of list of running jobs */
+ struct job *fg; /* current foreground job */
};
struct redirectionSpecifier {
- enum redirectionType type; /* type of redirection */
- int fd; /* file descriptor being redirected */
- char * filename; /* file to redirect fd to */
+ enum redirectionType type; /* type of redirection */
+ int fd; /* file descriptor being redirected */
+ char *filename; /* file to redirect fd to */
};
struct childProgram {
- pid_t pid; /* 0 if exited */
- char ** argv; /* program name and arguments */
- int numRedirections; /* elements in redirection array */
- struct redirectionSpecifier * redirections; /* I/O redirections */
- glob_t globResult; /* result of parameter globbing */
- int freeGlob; /* should we globfree(&globResult)? */
- int isStopped; /* is the program currently running? */
+ pid_t pid; /* 0 if exited */
+ char **argv; /* program name and arguments */
+ int numRedirections; /* elements in redirection array */
+ struct redirectionSpecifier *redirections; /* I/O redirections */
+ glob_t globResult; /* result of parameter globbing */
+ int freeGlob; /* should we globfree(&globResult)? */
+ int isStopped; /* is the program currently running? */
};
struct job {
- int jobId; /* job number */
- int numProgs; /* total number of programs in job */
- int runningProgs; /* number of programs running */
- char * text; /* name of job */
- char * cmdBuf; /* buffer various argv's point into */
- pid_t pgrp; /* process group ID for the job */
- struct childProgram * progs; /* array of programs in job */
- struct job * next; /* to track background commands */
- int stoppedProgs; /* number of programs alive, but stopped */
+ int jobId; /* job number */
+ int numProgs; /* total number of programs in job */
+ int runningProgs; /* number of programs running */
+ char *text; /* name of job */
+ char *cmdBuf; /* buffer various argv's point into */
+ pid_t pgrp; /* process group ID for the job */
+ struct childProgram *progs; /* array of programs in job */
+ struct job *next; /* to track background commands */
+ int stoppedProgs; /* number of programs alive, but stopped */
};
struct builtInCommand {
- char *cmd; /* name */
- char *descr; /* description */
- char *usage; /* usage */
- int (*function) (struct job *, struct jobSet * jobList); /* function ptr */
+ char *cmd; /* name */
+ char *descr; /* description */
+ char *usage; /* usage */
+ int (*function) (struct job *, struct jobSet * jobList); /* function ptr */
};
-/* Some function prototypes */
-static int shell_cd(struct job* cmd, struct jobSet* junk);
-static int shell_env(struct job* dummy, struct jobSet* junk);
-static int shell_exit(struct job* cmd, struct jobSet* junk);
-static int shell_fg_bg(struct job* cmd, struct jobSet* jobList);
-static int shell_help(struct job* cmd, struct jobSet* junk);
-static int shell_jobs(struct job* dummy, struct jobSet* jobList);
-static int shell_pwd(struct job* dummy, struct jobSet* junk);
-static int shell_set(struct job* cmd, struct jobSet* junk);
-static int shell_source(struct job* cmd, struct jobSet* jobList);
-static int shell_unset(struct job* cmd, struct jobSet* junk);
-
-static void checkJobs(struct jobSet * jobList);
-static int getCommand(FILE * source, char * command);
-static int parseCommand(char ** commandPtr, struct job * job, int * isBg);
-static int setupRedirections(struct childProgram * prog);
-static int runCommand(struct job newJob, struct jobSet * jobList, int inBg);
+/* function prototypes for builtins */
+static int builtin_cd(struct job *cmd, struct jobSet *junk);
+static int builtin_env(struct job *dummy, struct jobSet *junk);
+static int builtin_exit(struct job *cmd, struct jobSet *junk);
+static int builtin_fg_bg(struct job *cmd, struct jobSet *jobList);
+static int builtin_help(struct job *cmd, struct jobSet *junk);
+static int builtin_jobs(struct job *dummy, struct jobSet *jobList);
+static int builtin_pwd(struct job *dummy, struct jobSet *junk);
+static int builtin_export(struct job *cmd, struct jobSet *junk);
+static int builtin_source(struct job *cmd, struct jobSet *jobList);
+static int builtin_unset(struct job *cmd, struct jobSet *junk);
+static int builtin_read(struct job *cmd, struct jobSet *junk);
+
+
+/* function prototypes for shell stuff */
+static void checkJobs(struct jobSet *jobList);
+static int getCommand(FILE * source, char *command);
+static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobList, int *isBg);
+static int setupRedirections(struct childProgram *prog);
+static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg);
static int busy_loop(FILE * input);
-
-/* Table of built-in functions */
+
+/* Table of built-in functions (these are non-forking builtins, meaning they
+ * can change global variables in the parent shell process but they will not
+ * work with pipes and redirects; 'unset foo | whatever' will not work) */
static struct builtInCommand bltins[] = {
- {"bg", "Resume a job in the background", "bg [%%job]", shell_fg_bg},
- {"cd", "Change working directory", "cd [dir]", shell_cd},
- {"env", "Print all environment variables", "env", shell_env},
- {"exit", "Exit from shell()", "exit", shell_exit},
- {"fg", "Bring job into the foreground", "fg [%%job]", shell_fg_bg},
- {"jobs", "Lists the active jobs", "jobs", shell_jobs},
- {"pwd", "Print current directory", "pwd", shell_pwd},
- {"set", "Set environment variable", "set [VAR=value]", shell_set},
- {"unset", "Unset environment variable", "unset VAR", shell_unset},
- //{"echo", "Echo arguments on stdout", "echo arg1 [...]", shell_echo},
- {".", "Source-in and run commands in a file", ". filename", shell_source},
- {"help", "List shell built-in commands", "help", shell_help},
+ {"bg", "Resume a job in the background", "bg [%%job]", builtin_fg_bg},
+ {"cd", "Change working directory", "cd [dir]", builtin_cd},
+ {"exit", "Exit from shell()", "exit", builtin_exit},
+ {"fg", "Bring job into the foreground", "fg [%%job]", builtin_fg_bg},
+ {"jobs", "Lists the active jobs", "jobs", builtin_jobs},
+ {"export", "Set environment variable", "export [VAR=value]", builtin_export},
+ {"unset", "Unset environment variable", "unset VAR", builtin_unset},
+ {"read", "Input environment variable", "read [VAR]", builtin_read},
{NULL, NULL, NULL, NULL}
};
-static const char shell_usage[] =
- "sh [FILE]...\n\n"
- "The BusyBox command interpreter (shell).\n\n";
-
+/* Table of forking built-in functions (things that fork cannot change global
+ * variables in the parent process, such as the current working directory) */
+static struct builtInCommand bltins_forking[] = {
+ {"env", "Print all environment variables", "env", builtin_env},
+ {"pwd", "Print current directory", "pwd", builtin_pwd},
+ {".", "Source-in and run commands in a file", ". filename", builtin_source},
+ {"help", "List shell built-in commands", "help", builtin_help},
+ {NULL, NULL, NULL, NULL}
+};
-static char cwd[1024];
static char *prompt = "# ";
+static char *cwd = NULL;
+static char *local_pending_command = NULL;
+
+#ifdef BB_FEATURE_SH_COMMAND_EDITING
+void win_changed(int junk)
+{
+ struct winsize win = { 0, 0, 0, 0 };
+ ioctl(0, TIOCGWINSZ, &win);
+ if (win.ws_col > 0) {
+ cmdedit_setwidth( win.ws_col - 1);
+ }
+}
+#endif
/* built-in 'cd <path>' handler */
-static int shell_cd(struct job* cmd, struct jobSet* junk)
+static int builtin_cd(struct job *cmd, struct jobSet *junk)
{
char *newdir;
- if (!cmd->progs[0].argv[1] == 1)
- newdir = getenv("HOME");
- else
- newdir = cmd->progs[0].argv[1];
- if (chdir(newdir)) {
- printf("cd: %s: %s\n", newdir, strerror(errno));
- return FALSE;
+
+ if (!cmd->progs[0].argv[1] == 1)
+ newdir = getenv("HOME");
+ else
+ newdir = cmd->progs[0].argv[1];
+ if (chdir(newdir)) {
+ printf("cd: %s: %s\n", newdir, strerror(errno));
+ return FALSE;
}
getcwd(cwd, sizeof(cwd));
- return TRUE;
+ return TRUE;
}
/* built-in 'env' handler */
-static int shell_env(struct job* dummy, struct jobSet* junk)
+static int builtin_env(struct job *dummy, struct jobSet *junk)
{
char **e;
- for (e = environ ; *e ; e++) {
+ for (e = environ; *e; e++) {
fprintf(stdout, "%s\n", *e);
}
return (0);
}
/* built-in 'exit' handler */
-static int shell_exit(struct job* cmd, struct jobSet* junk)
+static int builtin_exit(struct job *cmd, struct jobSet *junk)
{
- if (!cmd->progs[0].argv[1] == 1)
- exit TRUE;
- else
- exit(atoi(cmd->progs[0].argv[1]));
+ if (!cmd->progs[0].argv[1] == 1)
+ exit TRUE;
+
+ return(atoi(cmd->progs[0].argv[1]));
}
/* built-in 'fg' and 'bg' handler */
-static int shell_fg_bg(struct job* cmd, struct jobSet* jobList)
+static int builtin_fg_bg(struct job *cmd, struct jobSet *jobList)
{
int i, jobNum;
- struct job* job;
-
- if (!cmd->progs[0].argv[1] || cmd->progs[0].argv[2]) {
- fprintf(stderr, "%s: exactly one argument is expected\n",
- cmd->progs[0].argv[0]);
- return FALSE;
- }
-
- if (sscanf(cmd->progs[0].argv[1], "%%%d", &jobNum) != 1) {
- fprintf(stderr, "%s: bad argument '%s'\n",
- cmd->progs[0].argv[0], cmd->progs[0].argv[1]);
- return FALSE;
- }
-
- for (job = jobList->head; job; job = job->next)
- if (job->jobId == jobNum) break;
-
- if (!job) {
- fprintf(stderr, "%s: unknown job %d\n",
- cmd->progs[0].argv[0], jobNum);
- return FALSE;
- }
-
- if (*cmd->progs[0].argv[0] == 'f') {
- /* Make this job the foreground job */
-
- if (tcsetpgrp(0, job->pgrp))
- perror("tcsetpgrp");
- jobList->fg = job;
- }
-
- /* Restart the processes in the job */
- for (i = 0; i < job->numProgs; i++)
- job->progs[i].isStopped = 0;
-
- kill(-job->pgrp, SIGCONT);
-
- job->stoppedProgs = 0;
-
- return TRUE;
+ struct job *job=NULL;
+
+ if (!jobList->head) {
+ if (!cmd->progs[0].argv[1] || cmd->progs[0].argv[2]) {
+ errorMsg("%s: exactly one argument is expected\n",
+ cmd->progs[0].argv[0]);
+ return FALSE;
+ }
+ if (sscanf(cmd->progs[0].argv[1], "%%%d", &jobNum) != 1) {
+ errorMsg("%s: bad argument '%s'\n",
+ cmd->progs[0].argv[0], cmd->progs[0].argv[1]);
+ return FALSE;
+ for (job = jobList->head; job; job = job->next) {
+ if (job->jobId == jobNum) {
+ break;
+ }
+ }
+ }
+ } else {
+ job = jobList->head;
+ }
+
+ if (!job) {
+ errorMsg("%s: unknown job %d\n",
+ cmd->progs[0].argv[0], jobNum);
+ return FALSE;
+ }
+
+ if (*cmd->progs[0].argv[0] == 'f') {
+ /* Make this job the foreground job */
+ /* suppress messages when run from /linuxrc mag@sysgo.de */
+ if (tcsetpgrp(0, job->pgrp) && errno != ENOTTY)
+ perror("tcsetpgrp");
+ jobList->fg = job;
+ }
+
+ /* Restart the processes in the job */
+ for (i = 0; i < job->numProgs; i++)
+ job->progs[i].isStopped = 0;
+
+ kill(-job->pgrp, SIGCONT);
+
+ job->stoppedProgs = 0;
+
+ return TRUE;
}
/* built-in 'help' handler */
-static int shell_help(struct job* cmd, struct jobSet* junk)
+static int builtin_help(struct job *dummy, struct jobSet *junk)
{
struct builtInCommand *x;
fprintf(stdout, "\nBuilt-in commands:\n");
fprintf(stdout, "-------------------\n");
- for ( x=bltins; x->cmd; x++) {
+ for (x = bltins; x->cmd; x++) {
+ fprintf(stdout, "%s\t%s\n", x->cmd, x->descr);
+ }
+ for (x = bltins_forking; x->cmd; x++) {
fprintf(stdout, "%s\t%s\n", x->cmd, x->descr);
}
fprintf(stdout, "\n\n");
}
/* built-in 'jobs' handler */
-static int shell_jobs(struct job* dummy, struct jobSet* jobList)
+static int builtin_jobs(struct job *dummy, struct jobSet *jobList)
{
- struct job * job;
- char * statusString;
- for (job = jobList->head; job; job = job->next) {
- if (job->runningProgs == job->stoppedProgs)
- statusString = "Stopped";
- else
- statusString = "Running";
-
- printf(JOB_STATUS_FORMAT, job->jobId, statusString,
- job->text);
- }
+ struct job *job;
+ char *statusString;
+
+ for (job = jobList->head; job; job = job->next) {
+ if (job->runningProgs == job->stoppedProgs)
+ statusString = "Stopped";
+ else
+ statusString = "Running";
+
+ printf(JOB_STATUS_FORMAT, job->jobId, statusString, job->text);
+ }
return TRUE;
}
/* built-in 'pwd' handler */
-static int shell_pwd(struct job* dummy, struct jobSet* junk)
+static int builtin_pwd(struct job *dummy, struct jobSet *junk)
{
getcwd(cwd, sizeof(cwd));
fprintf(stdout, "%s\n", cwd);
return TRUE;
}
-/* built-in 'set VAR=value' handler */
-static int shell_set(struct job* cmd, struct jobSet* junk)
+/* built-in 'export VAR=value' handler */
+static int builtin_export(struct job *cmd, struct jobSet *junk)
{
int res;
- if (!cmd->progs[0].argv[1] == 1) {
- return (shell_env(cmd, junk));
+ if (!cmd->progs[0].argv[1] == 1) {
+ return (builtin_env(cmd, junk));
}
res = putenv(cmd->progs[0].argv[1]);
if (res)
- fprintf(stdout, "set: %s\n", strerror(errno));
+ fprintf(stdout, "export: %s\n", strerror(errno));
+ return (res);
+}
+
+/* built-in 'read VAR' handler */
+static int builtin_read(struct job *cmd, struct jobSet *junk)
+{
+ int res = 0, len, newlen;
+ char *s;
+ char string[MAX_READ];
+
+ if (cmd->progs[0].argv[1]) {
+ /* argument (VAR) given: put "VAR=" into buffer */
+ strcpy(string, cmd->progs[0].argv[1]);
+ len = strlen(string);
+ string[len++] = '=';
+ string[len] = '\0';
+ fgets(&string[len], sizeof(string) - len, stdin); /* read string */
+ newlen = strlen(string);
+ if(newlen > len)
+ string[--newlen] = '\0'; /* chomp trailing newline */
+ /*
+ ** string should now contain "VAR=<value>"
+ ** copy it (putenv() won't do that, so we must make sure
+ ** the string resides in a static buffer!)
+ */
+ res = -1;
+ if((s = strdup(string)))
+ res = putenv(s);
+ if (res)
+ fprintf(stdout, "read: %s\n", strerror(errno));
+ }
+ else
+ fgets(string, sizeof(string), stdin);
+
return (res);
}
/* Built-in '.' handler (read-in and execute commands from file) */
-static int shell_source(struct job* cmd, struct jobSet* junk)
+static int builtin_source(struct job *cmd, struct jobSet *junk)
{
FILE *input;
int status;
-
- if (!cmd->progs[0].argv[1] == 1)
+
+ if (!cmd->progs[0].argv[1] == 1)
return FALSE;
input = fopen(cmd->progs[0].argv[1], "r");
if (!input) {
- fprintf(stdout, "Couldn't open file '%s'\n", cmd->progs[0].argv[1]);
+ fprintf(stdout, "Couldn't open file '%s'\n",
+ cmd->progs[0].argv[1]);
return FALSE;
}
}
/* built-in 'unset VAR' handler */
-static int shell_unset(struct job* cmd, struct jobSet* junk)
+static int builtin_unset(struct job *cmd, struct jobSet *junk)
{
- if (!cmd->progs[0].argv[1] == 1) {
+ if (!cmd->progs[0].argv[1] == 1) {
fprintf(stdout, "unset: parameter required.\n");
return FALSE;
}
}
/* free up all memory from a job */
-static void freeJob(struct job * cmd)
+static void freeJob(struct job *cmd)
{
- int i;
-
- for (i = 0; i < cmd->numProgs; i++) {
- free(cmd->progs[i].argv);
- if (cmd->progs[i].redirections) free(cmd->progs[i].redirections);
- if (cmd->progs[i].freeGlob) globfree(&cmd->progs[i].globResult);
- }
- free(cmd->progs);
- if (cmd->text) free(cmd->text);
- free(cmd->cmdBuf);
+ int i;
+
+ for (i = 0; i < cmd->numProgs; i++) {
+ free(cmd->progs[i].argv);
+ if (cmd->progs[i].redirections)
+ free(cmd->progs[i].redirections);
+ if (cmd->progs[i].freeGlob)
+ globfree(&cmd->progs[i].globResult);
+ }
+ free(cmd->progs);
+ if (cmd->text)
+ free(cmd->text);
+ free(cmd->cmdBuf);
+ memset(cmd, 0, sizeof(struct job));
}
/* remove a job from the jobList */
-static void removeJob(struct jobSet * jobList, struct job * job)
+static void removeJob(struct jobSet *jobList, struct job *job)
{
- struct job * prevJob;
-
- freeJob(job);
- if (job == jobList->head) {
- jobList->head = job->next;
- } else {
- prevJob = jobList->head;
- while (prevJob->next != job) prevJob = prevJob->next;
- prevJob->next = job->next;
- }
-
- free(job);
+ struct job *prevJob;
+
+ freeJob(job);
+ if (job == jobList->head) {
+ jobList->head = job->next;
+ } else {
+ prevJob = jobList->head;
+ while (prevJob->next != job)
+ prevJob = prevJob->next;
+ prevJob->next = job->next;
+ }
+
+ free(job);
}
/* Checks to see if any background processes have exited -- if they
have, figure out why and see if a job has completed */
-static void checkJobs(struct jobSet * jobList)
+static void checkJobs(struct jobSet *jobList)
{
- struct job * job;
- pid_t childpid;
- int status;
- int progNum=0;
-
- while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) {
- for (job = jobList->head; job; job = job->next) {
- progNum = 0;
- while (progNum < job->numProgs &&
- job->progs[progNum].pid != childpid)
- progNum++;
- if (progNum < job->numProgs) break;
- }
-
- if (WIFEXITED(status) || WIFSIGNALED(status)) {
- /* child exited */
- job->runningProgs--;
- job->progs[progNum].pid = 0;
-
- if (!job->runningProgs) {
- printf(JOB_STATUS_FORMAT, job->jobId, "Done", job->text);
- removeJob(jobList, job);
- }
- } else {
- /* child stopped */
- job->stoppedProgs++;
- job->progs[progNum].isStopped = 1;
-
- if (job->stoppedProgs == job->numProgs) {
- printf(JOB_STATUS_FORMAT, job->jobId, "Stopped", job->text);
- }
- }
- }
-
- if (childpid == -1 && errno != ECHILD)
- perror("waitpid");
+ struct job *job;
+ pid_t childpid;
+ int status;
+ int progNum = 0;
+
+ while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) {
+ for (job = jobList->head; job; job = job->next) {
+ progNum = 0;
+ while (progNum < job->numProgs &&
+ job->progs[progNum].pid != childpid) progNum++;
+ if (progNum < job->numProgs)
+ break;
+ }
+
+ if (WIFEXITED(status) || WIFSIGNALED(status)) {
+ /* child exited */
+ job->runningProgs--;
+ job->progs[progNum].pid = 0;
+
+ if (!job->runningProgs) {
+ printf(JOB_STATUS_FORMAT, job->jobId, "Done", job->text);
+ removeJob(jobList, job);
+ }
+ } else {
+ /* child stopped */
+ job->stoppedProgs++;
+ job->progs[progNum].isStopped = 1;
+
+ if (job->stoppedProgs == job->numProgs) {
+ printf(JOB_STATUS_FORMAT, job->jobId, "Stopped",
+ job->text);
+ }
+ }
+ }
+
+ if (childpid == -1 && errno != ECHILD)
+ perror("waitpid");
}
-static int getCommand(FILE * source, char * command)
+static int getCommand(FILE * source, char *command)
{
- if (source == stdin) {
+ if (source == NULL) {
+ if (local_pending_command) {
+ /* a command specified (-c option): return it & mark it done */
+ strcpy(command, local_pending_command);
+ free(local_pending_command);
+ local_pending_command = NULL;
+ return 0;
+ }
+ return 1;
+ }
+
+ if (source == stdin) {
+#ifdef BB_FEATURE_SH_COMMAND_EDITING
+ int len;
+ char *promptStr;
+ len=fprintf(stdout, "%s %s", cwd, prompt);
+ fflush(stdout);
+ promptStr=(char*)xmalloc(sizeof(char)*(len+1));
+ sprintf(promptStr, "%s %s", cwd, prompt);
+ cmdedit_read_input(promptStr, command);
+ free( promptStr);
+ return 0;
+#else
fprintf(stdout, "%s %s", cwd, prompt);
- fflush(stdout);
- }
+ fflush(stdout);
+#endif
+ }
- if (!fgets(command, MAX_COMMAND_LEN, source)) {
- if (source == stdin) printf("\n");
- return 1;
- }
+ if (!fgets(command, BUFSIZ - 2, source)) {
+ if (source == stdin)
+ printf("\n");
+ return 1;
+ }
- /* remove trailing newline */
- command[strlen(command) - 1] = '\0';
+ /* remove trailing newline */
+ command[strlen(command) - 1] = '\0';
- return 0;
+ return 0;
}
-static void globLastArgument(struct childProgram * prog, int * argcPtr,
- int * argcAllocedPtr)
+static void globLastArgument(struct childProgram *prog, int *argcPtr,
+ int *argcAllocedPtr)
{
- int argc = *argcPtr;
- int argcAlloced = *argcAllocedPtr;
- int rc;
- int flags;
- int i;
- char * src, * dst;
-
- if (argc > 1) { /* cmd->globResult is already initialized */
- flags = GLOB_APPEND;
- i = prog->globResult.gl_pathc;
- } else {
- prog->freeGlob = 1;
- flags = 0;
- i = 0;
- }
-
- rc = glob(prog->argv[argc - 1], flags, NULL, &prog->globResult);
- if (rc == GLOB_NOSPACE) {
- fprintf(stderr, "out of space during glob operation\n");
- return;
- } else if (rc == GLOB_NOMATCH ||
- (!rc && (prog->globResult.gl_pathc - i) == 1 &&
- !strcmp(prog->argv[argc - 1],
- prog->globResult.gl_pathv[i]))) {
- /* we need to remove whatever \ quoting is still present */
- src = dst = prog->argv[argc - 1];
- while (*src) {
- if (*src != '\\') *dst++ = *src;
- src++;
- }
- *dst = '\0';
- } else if (!rc) {
- argcAlloced += (prog->globResult.gl_pathc - i);
- prog->argv = realloc(prog->argv, argcAlloced * sizeof(*prog->argv));
- memcpy(prog->argv + (argc - 1), prog->globResult.gl_pathv + i,
- sizeof(*(prog->argv)) * (prog->globResult.gl_pathc - i));
- argc += (prog->globResult.gl_pathc - i - 1);
- }
-
- *argcAllocedPtr = argcAlloced;
- *argcPtr = argc;
+ int argc = *argcPtr;
+ int argcAlloced = *argcAllocedPtr;
+ int rc;
+ int flags;
+ int i;
+ char *src, *dst, *var;
+
+ if (argc > 1) { /* cmd->globResult is already initialized */
+ flags = GLOB_APPEND;
+ i = prog->globResult.gl_pathc;
+ } else {
+ prog->freeGlob = 1;
+ flags = 0;
+ i = 0;
+ }
+ /* do shell variable substitution */
+ if(*prog->argv[argc - 1] == '$' && (var = getenv(prog->argv[argc - 1] + 1)))
+ prog->argv[argc - 1] = var;
+
+ rc = glob(prog->argv[argc - 1], flags, NULL, &prog->globResult);
+ if (rc == GLOB_NOSPACE) {
+ errorMsg("out of space during glob operation\n");
+ return;
+ } else if (rc == GLOB_NOMATCH ||
+ (!rc && (prog->globResult.gl_pathc - i) == 1 &&
+ !strcmp(prog->argv[argc - 1],
+ prog->globResult.gl_pathv[i]))) {
+ /* we need to remove whatever \ quoting is still present */
+ src = dst = prog->argv[argc - 1];
+ while (*src) {
+ if (*src != '\\')
+ *dst++ = *src;
+ src++;
+ }
+ *dst = '\0';
+ } else if (!rc) {
+ argcAlloced += (prog->globResult.gl_pathc - i);
+ prog->argv =
+ realloc(prog->argv, argcAlloced * sizeof(*prog->argv));
+ memcpy(prog->argv + (argc - 1), prog->globResult.gl_pathv + i,
+ sizeof(*(prog->argv)) * (prog->globResult.gl_pathc - i));
+ argc += (prog->globResult.gl_pathc - i - 1);
+ }
+
+ *argcAllocedPtr = argcAlloced;
+ *argcPtr = argc;
}
/* Return cmd->numProgs as 0 if no command is present (e.g. an empty
the beginning of the next command (if the original command had more
then one job associated with it) or NULL if no more commands are
present. */
-static int parseCommand(char ** commandPtr, struct job * job, int * isBg)
+static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobList, int *isBg)
{
- char * command;
- char * returnCommand = NULL;
- char * src, * buf, * chptr;
- int argc = 0;
- int done = 0;
- int argvAlloced;
- int i;
- char quote = '\0';
- int count;
- struct childProgram * prog;
-
- /* skip leading white space */
- while (**commandPtr && isspace(**commandPtr)) (*commandPtr)++;
+ char *command;
+ char *returnCommand = NULL;
+ char *src, *buf, *chptr;
+ int argc = 0;
+ int done = 0;
+ int argvAlloced;
+ int i;
+ char quote = '\0';
+ int count;
+ struct childProgram *prog;
+
+ /* skip leading white space */
+ while (**commandPtr && isspace(**commandPtr))
+ (*commandPtr)++;
/* this handles empty lines or leading '#' characters */
- if (!**commandPtr || (**commandPtr=='#')) {
- job->numProgs = 0;
- *commandPtr = NULL;
- return 0;
- }
-
- *isBg = 0;
- job->numProgs = 1;
- job->progs = malloc(sizeof(*job->progs));
-
- /* We set the argv elements to point inside of this string. The
- memory is freed by freeJob().
-
- Getting clean memory relieves us of the task of NULL
- terminating things and makes the rest of this look a bit
- cleaner (though it is, admittedly, a tad less efficient) */
- job->cmdBuf = command = calloc(1, strlen(*commandPtr) + 1);
- job->text = NULL;
-
- prog = job->progs;
- prog->numRedirections = 0;
- prog->redirections = NULL;
- prog->freeGlob = 0;
- prog->isStopped = 0;
-
- argvAlloced = 5;
- prog->argv = malloc(sizeof(*prog->argv) * argvAlloced);
- prog->argv[0] = job->cmdBuf;
-
- buf = command;
- src = *commandPtr;
- while (*src && !done) {
- if (quote == *src) {
- quote = '\0';
- } else if (quote) {
- if (*src == '\\') {
- src++;
- if (!*src) {
- fprintf(stderr, "character expected after \\\n");
- freeJob(job);
- return 1;
- }
-
- /* in shell, "\'" should yield \' */
- if (*src != quote) *buf++ = '\\';
- } else if (*src == '*' || *src == '?' || *src == '[' ||
- *src == ']')
- *buf++ = '\\';
- *buf++ = *src;
- } else if (isspace(*src)) {
- if (*prog->argv[argc]) {
- buf++, argc++;
- /* +1 here leaves room for the NULL which ends argv */
- if ((argc + 1) == argvAlloced) {
- argvAlloced += 5;
- prog->argv = realloc(prog->argv,
- sizeof(*prog->argv) * argvAlloced);
- }
- prog->argv[argc] = buf;
-
- globLastArgument(prog, &argc, &argvAlloced);
- }
- } else switch (*src) {
- case '"':
- case '\'':
- quote = *src;
- break;
-
- case '#': /* comment */
- done = 1;
- break;
-
- case '>': /* redirections */
- case '<':
- i = prog->numRedirections++;
- prog->redirections = realloc(prog->redirections,
- sizeof(*prog->redirections) * (i + 1));
-
- prog->redirections[i].fd = -1;
- if (buf != prog->argv[argc]) {
- /* the stuff before this character may be the file number
- being redirected */
- prog->redirections[i].fd = strtol(prog->argv[argc], &chptr, 10);
-
- if (*chptr && *prog->argv[argc]) {
- buf++, argc++;
- globLastArgument(prog, &argc, &argvAlloced);
- }
- }
-
- if (prog->redirections[i].fd == -1) {
- if (*src == '>')
- prog->redirections[i].fd = 1;
- else
- prog->redirections[i].fd = 0;
- }
-
- if (*src++ == '>') {
- if (*src == '>')
- prog->redirections[i].type = REDIRECT_APPEND, src++;
- else
- prog->redirections[i].type = REDIRECT_OVERWRITE;
- } else {
- prog->redirections[i].type = REDIRECT_INPUT;
- }
-
- /* This isn't POSIX sh compliant. Oh well. */
- chptr = src;
- while (isspace(*chptr)) chptr++;
-
- if (!*chptr) {
- fprintf(stderr, "file name expected after %c\n", *src);
- freeJob(job);
- return 1;
- }
-
- prog->redirections[i].filename = buf;
- while (*chptr && !isspace(*chptr))
- *buf++ = *chptr++;
-
- src = chptr - 1; /* we src++ later */
- prog->argv[argc] = ++buf;
- break;
-
- case '|': /* pipe */
- /* finish this command */
- if (*prog->argv[argc]) argc++;
- if (!argc) {
- fprintf(stderr, "empty command in pipe\n");
- freeJob(job);
- return 1;
- }
- prog->argv[argc] = NULL;
-
- /* and start the next */
- job->numProgs++;
- job->progs = realloc(job->progs,
- sizeof(*job->progs) * job->numProgs);
- prog = job->progs + (job->numProgs - 1);
- prog->numRedirections = 0;
- prog->redirections = NULL;
- prog->freeGlob = 0;
- argc = 0;
-
- argvAlloced = 5;
- prog->argv = malloc(sizeof(*prog->argv) * argvAlloced);
- prog->argv[0] = ++buf;
-
- src++;
- while (*src && isspace(*src)) src++;
-
- if (!*src) {
- fprintf(stderr, "empty command in pipe\n");
- return 1;
- }
- src--; /* we'll ++ it at the end of the loop */
-
- break;
-
- case '&': /* background */
- *isBg = 1;
- case ';': /* multiple commands */
- done = 1;
- returnCommand = *commandPtr + (src - *commandPtr) + 1;
- break;
-
- case '\\':
- src++;
- if (!*src) {
- freeJob(job);
- fprintf(stderr, "character expected after \\\n");
- return 1;
- }
- if (*src == '*' || *src == '[' || *src == ']' || *src == '?')
- *buf++ = '\\';
- /* fallthrough */
- default:
- *buf++ = *src;
- }
-
- src++;
- }
-
- if (*prog->argv[argc]) {
- argc++;
- globLastArgument(prog, &argc, &argvAlloced);
- }
- if (!argc) {
- freeJob(job);
- return 0;
- }
- prog->argv[argc] = NULL;
-
- if (!returnCommand) {
- job->text = malloc(strlen(*commandPtr) + 1);
- strcpy(job->text, *commandPtr);
- } else {
- /* This leaves any trailing spaces, which is a bit sloppy */
-
- count = returnCommand - *commandPtr;
- job->text = malloc(count + 1);
- strncpy(job->text, *commandPtr, count);
- job->text[count] = '\0';
- }
-
- *commandPtr = returnCommand;
-
- return 0;
+ if (!**commandPtr || (**commandPtr == '#')) {
+ job->numProgs=0;
+ return 0;
+ }
+
+ *isBg = 0;
+ job->numProgs = 1;
+ job->progs = xmalloc(sizeof(*job->progs));
+
+ /* We set the argv elements to point inside of this string. The
+ memory is freed by freeJob(). Allocate twice the original
+ length in case we need to quote every single character.
+
+ Getting clean memory relieves us of the task of NULL
+ terminating things and makes the rest of this look a bit
+ cleaner (though it is, admittedly, a tad less efficient) */
+ job->cmdBuf = command = calloc(1, 2*strlen(*commandPtr) + 1);
+ job->text = NULL;
+
+ prog = job->progs;
+ prog->numRedirections = 0;
+ prog->redirections = NULL;
+ prog->freeGlob = 0;
+ prog->isStopped = 0;
+
+ argvAlloced = 5;
+ prog->argv = xmalloc(sizeof(*prog->argv) * argvAlloced);
+ prog->argv[0] = job->cmdBuf;
+
+ buf = command;
+ src = *commandPtr;
+ while (*src && !done) {
+ if (quote == *src) {
+ quote = '\0';
+ } else if (quote) {
+ if (*src == '\\') {
+ src++;
+ if (!*src) {
+ errorMsg("character expected after \\\n");
+ freeJob(job);
+ return 1;
+ }
+
+ /* in shell, "\'" should yield \' */
+ if (*src != quote)
+ *buf++ = '\\';
+ } else if (*src == '*' || *src == '?' || *src == '[' ||
+ *src == ']') *buf++ = '\\';
+ *buf++ = *src;
+ } else if (isspace(*src)) {
+ if (*prog->argv[argc]) {
+ buf++, argc++;
+ /* +1 here leaves room for the NULL which ends argv */
+ if ((argc + 1) == argvAlloced) {
+ argvAlloced += 5;
+ prog->argv = realloc(prog->argv,
+ sizeof(*prog->argv) *
+ argvAlloced);
+ }
+ globLastArgument(prog, &argc, &argvAlloced);
+ prog->argv[argc] = buf;
+ }
+ } else
+ switch (*src) {
+ case '"':
+ case '\'':
+ quote = *src;
+ break;
+
+ case '#': /* comment */
+ done = 1;
+ break;
+
+ case '>': /* redirections */
+ case '<':
+ i = prog->numRedirections++;
+ prog->redirections = realloc(prog->redirections,
+ sizeof(*prog->redirections) *
+ (i + 1));
+
+ prog->redirections[i].fd = -1;
+ if (buf != prog->argv[argc]) {
+ /* the stuff before this character may be the file number
+ being redirected */
+ prog->redirections[i].fd =
+ strtol(prog->argv[argc], &chptr, 10);
+
+ if (*chptr && *prog->argv[argc]) {
+ buf++, argc++;
+ globLastArgument(prog, &argc, &argvAlloced);
+ prog->argv[argc] = buf;
+ }
+ }
+
+ if (prog->redirections[i].fd == -1) {
+ if (*src == '>')
+ prog->redirections[i].fd = 1;
+ else
+ prog->redirections[i].fd = 0;
+ }
+
+ if (*src++ == '>') {
+ if (*src == '>')
+ prog->redirections[i].type =
+ REDIRECT_APPEND, src++;
+ else
+ prog->redirections[i].type = REDIRECT_OVERWRITE;
+ } else {
+ prog->redirections[i].type = REDIRECT_INPUT;
+ }
+
+ /* This isn't POSIX sh compliant. Oh well. */
+ chptr = src;
+ while (isspace(*chptr))
+ chptr++;
+
+ if (!*chptr) {
+ errorMsg("file name expected after %c\n", *src);
+ freeJob(job);
+ job->numProgs=0;
+ return 1;
+ }
+
+ prog->redirections[i].filename = buf;
+ while (*chptr && !isspace(*chptr))
+ *buf++ = *chptr++;
+
+ src = chptr - 1; /* we src++ later */
+ prog->argv[argc] = ++buf;
+ break;
+
+ case '|': /* pipe */
+ /* finish this command */
+ if (*prog->argv[argc])
+ argc++;
+ if (!argc) {
+ errorMsg("empty command in pipe1\n");
+ freeJob(job);
+ job->numProgs=0;
+ return 1;
+ }
+ prog->argv[argc] = NULL;
+
+ /* and start the next */
+ job->numProgs++;
+ job->progs = realloc(job->progs,
+ sizeof(*job->progs) * job->numProgs);
+ prog = job->progs + (job->numProgs - 1);
+ prog->numRedirections = 0;
+ prog->redirections = NULL;
+ prog->freeGlob = 0;
+ argc = 0;
+
+ argvAlloced = 5;
+ prog->argv = xmalloc(sizeof(*prog->argv) * argvAlloced);
+ prog->argv[0] = ++buf;
+
+ src++;
+ while (*src && isspace(*src))
+ src++;
+
+ if (!*src) {
+ errorMsg("empty command in pipe2\n");
+ freeJob(job);
+ job->numProgs=0;
+ return 1;
+ }
+ src--; /* we'll ++ it at the end of the loop */
+
+ break;
+
+ case '&': /* background */
+ *isBg = 1;
+ case ';': /* multiple commands */
+ done = 1;
+ returnCommand = *commandPtr + (src - *commandPtr) + 1;
+ break;
+
+ case '\\':
+ src++;
+ if (!*src) {
+ errorMsg("character expected after \\\n");
+ freeJob(job);
+ return 1;
+ }
+ if (*src == '*' || *src == '[' || *src == ']'
+ || *src == '?') *buf++ = '\\';
+ /* fallthrough */
+ case '`':
+ /* Exec a backtick-ed command */
+ {
+ char* newcmd=NULL;
+ char* ptr=NULL;
+ struct job newJob;
+
+ ptr=strchr(++src, '`');
+ if (ptr==NULL) {
+ fprintf(stderr, "Unmatched '`' in command\n");
+ freeJob(job);
+ return 1;
+ }
+
+ newcmd = xmalloc(1+ptr-src);
+ snprintf(newcmd, 1+ptr-src, src);
+
+ if (!parseCommand(&newcmd, &newJob, jobList, isBg) &&
+ newJob.numProgs) {
+ runCommand(&newJob, jobList, *isBg);
+ }
+
+ /* Clip out the the backticked command from the string */
+ memmove(--src, ptr, strlen(ptr)+1);
+ free(newcmd);
+ }
+ break;
+ default:
+ *buf++ = *src;
+ }
+
+ src++;
+ }
+
+ if (*prog->argv[argc]) {
+ argc++;
+ globLastArgument(prog, &argc, &argvAlloced);
+ }
+ if (!argc) {
+ freeJob(job);
+ return 0;
+ }
+ prog->argv[argc] = NULL;
+
+ if (!returnCommand) {
+ job->text = xmalloc(strlen(*commandPtr) + 1);
+ strcpy(job->text, *commandPtr);
+ } else {
+ /* This leaves any trailing spaces, which is a bit sloppy */
+ count = returnCommand - *commandPtr;
+ job->text = xmalloc(count + 1);
+ strncpy(job->text, *commandPtr, count);
+ job->text[count] = '\0';
+ }
+
+ *commandPtr = returnCommand;
+
+ return 0;
}
-static int runCommand(struct job newJob, struct jobSet * jobList,
- int inBg)
+
+static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
{
- struct job * job;
- int i;
- int nextin, nextout;
- int pipefds[2]; /* pipefd[0] is for reading */
- struct builtInCommand *x;
-
- /* handle built-ins here -- we don't fork() so we can't background
- these very easily */
- for( x=bltins ; x->cmd ; x++) {
- if (!strcmp(newJob.progs[0].argv[0], x->cmd)) {
- return(x->function(&newJob, jobList));
+ struct job *job;
+ int i;
+ int nextin, nextout;
+ int pipefds[2]; /* pipefd[0] is for reading */
+ struct builtInCommand *x;
+#ifdef BB_FEATURE_SH_STANDALONE_SHELL
+ const struct BB_applet *a = applets;
+#endif
+
+
+ nextin = 0, nextout = 1;
+ for (i = 0; i < newJob->numProgs; i++) {
+ if ((i + 1) < newJob->numProgs) {
+ pipe(pipefds);
+ nextout = pipefds[1];
+ } else {
+ nextout = 1;
+ }
+
+ /* Check if the command matches any non-forking builtins */
+ for (x = bltins; x->cmd; x++) {
+ if (!strcmp(newJob->progs[i].argv[0], x->cmd)) {
+ return (x->function(newJob, jobList));
+ }
}
- }
-
- nextin = 0, nextout = 1;
- for (i = 0; i < newJob.numProgs; i++) {
- if ((i + 1) < newJob.numProgs) {
- pipe(pipefds);
- nextout = pipefds[1];
- } else {
- nextout = 1;
- }
-
- if (!(newJob.progs[i].pid = fork())) {
- signal(SIGTTOU, SIG_DFL);
-
- if (nextin != 0) {
- dup2(nextin, 0);
- close(nextin);
- }
-
- if (nextout != 1) {
- dup2(nextout, 1);
- close(nextout);
- }
-
- /* explicit redirections override pipes */
- setupRedirections(newJob.progs + i);
-
- execvp(newJob.progs[i].argv[0], newJob.progs[i].argv);
- fatalError( "sh: %s: %s\n", newJob.progs[i].argv[0],
- strerror(errno));
- }
-
- /* put our child in the process group whose leader is the
- first process in this pipe */
- setpgid(newJob.progs[i].pid, newJob.progs[0].pid);
-
- if (nextin != 0) close(nextin);
- if (nextout != 1) close(nextout);
-
- /* If there isn't another process, nextin is garbage
- but it doesn't matter */
- nextin = pipefds[0];
- }
-
- newJob.pgrp = newJob.progs[0].pid;
-
- /* find the ID for the job to use */
- newJob.jobId = 1;
- for (job = jobList->head; job; job = job->next)
- if (job->jobId >= newJob.jobId)
- newJob.jobId = job->jobId + 1;
-
- /* add the job to the list of running jobs */
- if (!jobList->head) {
- job = jobList->head = malloc(sizeof(*job));
- } else {
- for (job = jobList->head; job->next; job = job->next);
- job->next = malloc(sizeof(*job));
- job = job->next;
- }
-
- *job = newJob;
- job->next = NULL;
- job->runningProgs = job->numProgs;
- job->stoppedProgs = 0;
-
- if (inBg) {
- /* we don't wait for background jobs to return -- append it
- to the list of backgrounded jobs and leave it alone */
-
- printf("[%d] %d\n", job->jobId,
- newJob.progs[newJob.numProgs - 1].pid);
- } else {
- jobList->fg = job;
-
- /* move the new process group into the foreground */
-
- if (tcsetpgrp(0, newJob.pgrp))
- perror("tcsetpgrp");
- }
-
- return 0;
+
+ if (!(newJob->progs[i].pid = fork())) {
+ signal(SIGTTOU, SIG_DFL);
+
+ if (nextin != 0) {
+ dup2(nextin, 0);
+ close(nextin);
+ }
+
+ if (nextout != 1) {
+ dup2(nextout, 1);
+ close(nextout);
+ }
+
+ /* explicit redirections override pipes */
+ setupRedirections(newJob->progs + i);
+
+ /* Check if the command matches any of the other builtins */
+ for (x = bltins_forking; x->cmd; x++) {
+ if (!strcmp(newJob->progs[i].argv[0], x->cmd)) {
+ exit (x->function(newJob, jobList));
+ }
+ }
+#ifdef BB_FEATURE_SH_STANDALONE_SHELL
+ /* Check if the command matches any busybox internal commands here */
+ /* TODO: Add matching when paths are appended (i.e. 'cat' currently
+ * works, but '/bin/cat' doesn't ) */
+ while (a->name != 0) {
+ if (strcmp(newJob->progs[i].argv[0], a->name) == 0) {
+ int argc;
+ char** argv=newJob->progs[i].argv;
+ for(argc=0;*argv!=NULL; argv++, argc++);
+ exit((*(a->main)) (argc, newJob->progs[i].argv));
+ }
+ a++;
+ }
+#endif
+
+ execvp(newJob->progs[i].argv[0], newJob->progs[i].argv);
+ fatalError("%s: %s\n", newJob->progs[i].argv[0],
+ strerror(errno));
+ }
+
+ /* put our child in the process group whose leader is the
+ first process in this pipe */
+ setpgid(newJob->progs[i].pid, newJob->progs[0].pid);
+
+ if (nextin != 0)
+ close(nextin);
+ if (nextout != 1)
+ close(nextout);
+
+ /* If there isn't another process, nextin is garbage
+ but it doesn't matter */
+ nextin = pipefds[0];
+ }
+
+ newJob->pgrp = newJob->progs[0].pid;
+
+ /* find the ID for the job to use */
+ newJob->jobId = 1;
+ for (job = jobList->head; job; job = job->next)
+ if (job->jobId >= newJob->jobId)
+ newJob->jobId = job->jobId + 1;
+
+ /* add the job to the list of running jobs */
+ if (!jobList->head) {
+ job = jobList->head = xmalloc(sizeof(*job));
+ } else {
+ for (job = jobList->head; job->next; job = job->next);
+ job->next = xmalloc(sizeof(*job));
+ job = job->next;
+ }
+
+ *job = *newJob;
+ job->next = NULL;
+ job->runningProgs = job->numProgs;
+ job->stoppedProgs = 0;
+
+ if (inBg) {
+ /* we don't wait for background jobs to return -- append it
+ to the list of backgrounded jobs and leave it alone */
+ printf("[%d] %d\n", job->jobId,
+ newJob->progs[newJob->numProgs - 1].pid);
+ } else {
+ jobList->fg = job;
+
+ /* move the new process group into the foreground */
+ /* suppress messages when run from /linuxrc mag@sysgo.de */
+ if (tcsetpgrp(0, newJob->pgrp) && errno != ENOTTY)
+ perror("tcsetpgrp");
+ }
+
+ return 0;
}
-static int setupRedirections(struct childProgram * prog)
+static int setupRedirections(struct childProgram *prog)
{
- int i;
- int openfd;
- int mode=O_RDONLY;
- struct redirectionSpecifier * redir = prog->redirections;
-
- for (i = 0; i < prog->numRedirections; i++, redir++) {
- switch (redir->type) {
- case REDIRECT_INPUT:
- mode = O_RDONLY;
- break;
- case REDIRECT_OVERWRITE:
- mode = O_RDWR | O_CREAT | O_TRUNC;
- break;
- case REDIRECT_APPEND:
- mode = O_RDWR | O_CREAT | O_APPEND;
- break;
- }
-
- openfd = open(redir->filename, mode, 0666);
- 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!) */
- fprintf(stderr, "error opening %s: %s\n", redir->filename,
- strerror(errno));
- return 1;
- }
-
- if (openfd != redir->fd) {
- dup2(openfd, redir->fd);
- close(openfd);
- }
- }
-
- return 0;
+ int i;
+ int openfd;
+ int mode = O_RDONLY;
+ struct redirectionSpecifier *redir = prog->redirections;
+
+ for (i = 0; i < prog->numRedirections; i++, redir++) {
+ switch (redir->type) {
+ case REDIRECT_INPUT:
+ mode = O_RDONLY;
+ break;
+ case REDIRECT_OVERWRITE:
+ mode = O_RDWR | O_CREAT | O_TRUNC;
+ break;
+ case REDIRECT_APPEND:
+ mode = O_RDWR | O_CREAT | O_APPEND;
+ break;
+ }
+
+ openfd = open(redir->filename, mode, 0666);
+ 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!) */
+ errorMsg("error opening %s: %s\n", redir->filename,
+ strerror(errno));
+ return 1;
+ }
+
+ if (openfd != redir->fd) {
+ dup2(openfd, redir->fd);
+ close(openfd);
+ }
+ }
+
+ return 0;
}
-static int busy_loop(FILE * input)
+static int busy_loop(FILE * input)
{
- char command[MAX_COMMAND_LEN + 1];
- char * nextCommand = NULL;
- struct jobSet jobList = { NULL, NULL };
- struct job newJob;
- int i;
- int status;
- int inBg;
-
- /* don't pay any attention to this signal; it just confuses
- things and isn't really meant for shells anyway */
- signal(SIGTTOU, SIG_IGN);
-
- while (1) {
- if (!jobList.fg) {
- /* no job is in the foreground */
-
- /* see if any background processes have exited */
- checkJobs(&jobList);
-
- if (!nextCommand) {
- if (getCommand(input, command)) break;
- nextCommand = command;
- }
-
- if (!parseCommand(&nextCommand, &newJob, &inBg) &&
- newJob.numProgs) {
- runCommand(newJob, &jobList, inBg);
- }
- } else {
- /* a job is running in the foreground; wait for it */
- i = 0;
- while (!jobList.fg->progs[i].pid ||
- jobList.fg->progs[i].isStopped) i++;
-
- waitpid(jobList.fg->progs[i].pid, &status, WUNTRACED);
-
- if (WIFEXITED(status) || WIFSIGNALED(status)) {
- /* the child exited */
- jobList.fg->runningProgs--;
- jobList.fg->progs[i].pid = 0;
-
- if (!jobList.fg->runningProgs) {
- /* child exited */
-
- removeJob(&jobList, jobList.fg);
- jobList.fg = NULL;
-
- /* move the shell to the foreground */
- if (tcsetpgrp(0, getpid()))
- perror("tcsetpgrp");
- }
- } else {
- /* the child was stopped */
- jobList.fg->stoppedProgs++;
- jobList.fg->progs[i].isStopped = 1;
-
- if (jobList.fg->stoppedProgs == jobList.fg->runningProgs) {
- printf("\n" JOB_STATUS_FORMAT, jobList.fg->jobId,
- "Stopped", jobList.fg->text);
- jobList.fg = NULL;
- }
- }
-
- if (!jobList.fg) {
- /* move the shell to the foreground */
- if (tcsetpgrp(0, getpid()))
- perror("tcsetpgrp");
- }
- }
- }
-
- return 0;
+ char *command;
+ char *nextCommand = NULL;
+ struct jobSet jobList = { NULL, NULL };
+ struct job newJob;
+ pid_t parent_pgrp;
+ int i;
+ int status;
+ int inBg;
+
+ /* save current owner of TTY so we can restore it on exit */
+ parent_pgrp = tcgetpgrp(0);
+
+ command = (char *) calloc(BUFSIZ, sizeof(char));
+
+ /* don't pay any attention to this signal; it just confuses
+ things and isn't really meant for shells anyway */
+ signal(SIGTTOU, SIG_IGN);
+
+ while (1) {
+ if (!jobList.fg) {
+ /* no job is in the foreground */
+
+ /* see if any background processes have exited */
+ checkJobs(&jobList);
+
+ if (!nextCommand) {
+ if (getCommand(input, command))
+ break;
+ nextCommand = command;
+ }
+
+ if (!parseCommand(&nextCommand, &newJob, &jobList, &inBg) &&
+ newJob.numProgs) {
+ runCommand(&newJob, &jobList, inBg);
+ } else {
+ nextCommand=NULL;
+ }
+ } else {
+ /* a job is running in the foreground; wait for it */
+ i = 0;
+ while (!jobList.fg->progs[i].pid ||
+ jobList.fg->progs[i].isStopped) i++;
+
+ waitpid(jobList.fg->progs[i].pid, &status, WUNTRACED);
+
+ if (WIFEXITED(status) || WIFSIGNALED(status)) {
+ /* the child exited */
+ jobList.fg->runningProgs--;
+ jobList.fg->progs[i].pid = 0;
+
+ if (!jobList.fg->runningProgs) {
+ /* child exited */
+
+ removeJob(&jobList, jobList.fg);
+ jobList.fg = NULL;
+ }
+ } else {
+ /* the child was stopped */
+ jobList.fg->stoppedProgs++;
+ jobList.fg->progs[i].isStopped = 1;
+
+ if (jobList.fg->stoppedProgs == jobList.fg->runningProgs) {
+ printf("\n" JOB_STATUS_FORMAT, jobList.fg->jobId,
+ "Stopped", jobList.fg->text);
+ jobList.fg = NULL;
+ }
+ }
+
+ if (!jobList.fg) {
+ /* move the shell to the foreground */
+ /* suppress messages when run from /linuxrc mag@sysgo.de */
+ if (tcsetpgrp(0, getpid()) && errno != ENOTTY)
+ perror("tcsetpgrp");
+ }
+ }
+ }
+ free(command);
+
+ /* return controlling TTY back to parent process group before exiting */
+ if (tcsetpgrp(0, parent_pgrp))
+ perror("tcsetpgrp");
+
+ /* return exit status if called with "-c" */
+ if (input == NULL && WIFEXITED(status))
+ return WEXITSTATUS(status);
+
+ return 0;
}
-int shell_main(int argc, char ** argv)
+int shell_main(int argc, char **argv)
{
- FILE * input = stdin;
+ FILE *input = stdin;
- if (argc > 2) {
- usage( shell_usage);
- }
/* initialize the cwd */
- getcwd(cwd, sizeof(cwd));
+ cwd = (char *) calloc(BUFSIZ, sizeof(char));
+ if (cwd == 0) {
+ fatalError("out of memory\n");
+ }
+ getcwd(cwd, sizeof(char)*BUFSIZ);
+#ifdef BB_FEATURE_SH_COMMAND_EDITING
+ cmdedit_init();
+ signal(SIGWINCH, win_changed);
+ win_changed(0);
+#endif
//if (argv[0] && argv[0][0] == '-') {
- // shell_source("/etc/profile");
+ // builtin_source("/etc/profile");
//}
-
+
if (argc < 2) {
fprintf(stdout, "\n\nBusyBox v%s (%s) Built-in shell\n", BB_VER, BB_BT);
fprintf(stdout, "Enter 'help' for a list of built-in commands.\n\n");
} else {
- input = fopen(argv[1], "r");
- if (!input)
- fatalError("A: Couldn't open file '%s': %s\n", argv[1], strerror(errno));
-// else
-// fatalError("Got it.\n");
- //exit(shell_source(argv[1]));
- }
-
- return (busy_loop( input));
+ if (argv[1][0]=='-' && argv[1][1]=='c') {
+ int i;
+ local_pending_command = (char *) calloc(BUFSIZ, sizeof(char));
+ if (local_pending_command == 0) {
+ fatalError("out of memory\n");
+ }
+ for(i=2; i<argc; i++)
+ {
+ if (strlen(local_pending_command) + strlen(argv[i]) >= BUFSIZ) {
+ local_pending_command = realloc(local_pending_command,
+ strlen(local_pending_command) + strlen(argv[i]));
+ if (local_pending_command==NULL)
+ fatalError("commands for -c option too long\n");
+ }
+ strcat(local_pending_command, argv[i]);
+ if ( (i + 1) < argc)
+ strcat(local_pending_command, " ");
+ }
+ input = NULL;
+
+ }
+ else if (argv[1][0]=='-') {
+ usage(shell_usage);
+ }
+ else {
+ input = fopen(argv[1], "r");
+ if (!input) {
+ fatalError("Couldn't open file '%s': %s\n", argv[1],
+ strerror(errno));
+ }
+ }
+ }
+
+ return (busy_loop(input));
}
projects / oweals / busybox.git / blobdiff