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_export(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 int shell_read(struct job *cmd, struct jobSet *junk);
-
+/* 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, int *isBg);
+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 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},
- {"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},
- {"export", "Set environment variable", "export [VAR=value]", shell_export},
- {"unset", "Unset environment variable", "unset VAR", shell_unset},
- {"read", "Input environment variable", "read [VAR]", shell_read},
+ {"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}
};
-/* Table of built-in functions */
+/* 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", shell_env},
- {"pwd", "Print current directory", "pwd", shell_pwd},
- {".", "Source-in and run commands in a file", ". filename", shell_source},
- {"help", "List shell built-in commands", "help", shell_help},
+ {"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 const char shell_usage[] =
- "sh [FILE]...\n"
- " or: sh -c command [args]...\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nlash: The BusyBox command interpreter (shell).\n\n"
-#endif
- ;
-
static char *prompt = "# ";
static char *cwd = NULL;
static char *local_pending_command = NULL;
#ifdef BB_FEATURE_SH_COMMAND_EDITING
-void win_changed(int sig)
+void win_changed(int junk)
{
- struct winsize win = { 0, 0 };
+ struct winsize win = { 0, 0, 0, 0 };
ioctl(0, TIOCGWINSZ, &win);
if (win.ws_col > 0) {
cmdedit_setwidth( win.ws_col - 1);
/* 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;
}
/* 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;
}
/* 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;
}
/* 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=NULL;
if (!jobList->head) {
if (!cmd->progs[0].argv[1] || cmd->progs[0].argv[2]) {
- fprintf(stderr, "%s: exactly one argument is expected\n",
+ 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) {
- fprintf(stderr, "%s: bad argument '%s'\n",
+ 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) {
- fprintf(stderr, "%s: unknown job %d\n",
+ errorMsg("%s: unknown job %d\n",
cmd->progs[0].argv[0], jobNum);
return FALSE;
}
}
/* 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;
}
/* 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;
/* 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);
}
/* built-in 'export VAR=value' handler */
-static int shell_export(struct job *cmd, struct jobSet *junk)
+static int builtin_export(struct job *cmd, struct jobSet *junk)
{
int res;
if (!cmd->progs[0].argv[1] == 1) {
- return (shell_env(cmd, junk));
+ return (builtin_env(cmd, junk));
}
res = putenv(cmd->progs[0].argv[1]);
if (res)
}
/* built-in 'read VAR' handler */
-static int shell_read(struct job *cmd, struct jobSet *junk)
+static int builtin_read(struct job *cmd, struct jobSet *junk)
{
int res = 0, len, newlen;
char *s;
}
/* 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;
}
/* 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) {
fprintf(stdout, "unset: parameter required.\n");
if (cmd->text)
free(cmd->text);
free(cmd->cmdBuf);
+ memset(cmd, 0, sizeof(struct job));
}
/* remove a job from the jobList */
char *promptStr;
len=fprintf(stdout, "%s %s", cwd, prompt);
fflush(stdout);
- promptStr=(char*)malloc(sizeof(char)*(len+1));
+ promptStr=(char*)xmalloc(sizeof(char)*(len+1));
sprintf(promptStr, "%s %s", cwd, prompt);
cmdedit_read_input(promptStr, command);
free( promptStr);
rc = glob(prog->argv[argc - 1], flags, NULL, &prog->globResult);
if (rc == GLOB_NOSPACE) {
- fprintf(stderr, "out of space during glob operation\n");
+ errorMsg("out of space during glob operation\n");
return;
} else if (rc == GLOB_NOMATCH ||
(!rc && (prog->globResult.gl_pathc - i) == 1 &&
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;
/* this handles empty lines or leading '#' characters */
if (!**commandPtr || (**commandPtr == '#')) {
- job->numProgs = 0;
- *commandPtr = NULL;
+ job->numProgs=0;
return 0;
}
*isBg = 0;
job->numProgs = 1;
- job->progs = malloc(sizeof(*job->progs));
+ 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
prog->isStopped = 0;
argvAlloced = 5;
- prog->argv = malloc(sizeof(*prog->argv) * argvAlloced);
+ prog->argv = xmalloc(sizeof(*prog->argv) * argvAlloced);
prog->argv[0] = job->cmdBuf;
buf = command;
if (*src == '\\') {
src++;
if (!*src) {
- fprintf(stderr, "character expected after \\\n");
+ errorMsg("character expected after \\\n");
freeJob(job);
return 1;
}
chptr++;
if (!*chptr) {
- fprintf(stderr, "file name expected after %c\n", *src);
+ errorMsg("file name expected after %c\n", *src);
freeJob(job);
+ job->numProgs=0;
return 1;
}
if (*prog->argv[argc])
argc++;
if (!argc) {
- fprintf(stderr, "empty command in pipe\n");
+ errorMsg("empty command in pipe1\n");
freeJob(job);
+ job->numProgs=0;
return 1;
}
prog->argv[argc] = NULL;
argc = 0;
argvAlloced = 5;
- prog->argv = malloc(sizeof(*prog->argv) * argvAlloced);
+ prog->argv = xmalloc(sizeof(*prog->argv) * argvAlloced);
prog->argv[0] = ++buf;
src++;
src++;
if (!*src) {
- fprintf(stderr, "empty command in pipe\n");
+ errorMsg("empty command in pipe2\n");
+ freeJob(job);
+ job->numProgs=0;
return 1;
}
src--; /* we'll ++ it at the end of the loop */
case '\\':
src++;
if (!*src) {
+ errorMsg("character expected after \\\n");
freeJob(job);
- fprintf(stderr, "character expected after \\\n");
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;
}
prog->argv[argc] = NULL;
if (!returnCommand) {
- job->text = malloc(strlen(*commandPtr) + 1);
+ 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 = malloc(count + 1);
+ job->text = xmalloc(count + 1);
strncpy(job->text, *commandPtr, count);
job->text[count] = '\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;
nextin = 0, nextout = 1;
- for (i = 0; i < newJob.numProgs; i++) {
- if ((i + 1) < newJob.numProgs) {
+ for (i = 0; i < newJob->numProgs; i++) {
+ if ((i + 1) < newJob->numProgs) {
pipe(pipefds);
nextout = pipefds[1];
} else {
nextout = 1;
}
- /* Match any built-ins here */
+ /* 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));
+ if (!strcmp(newJob->progs[i].argv[0], x->cmd)) {
+ return (x->function(newJob, jobList));
}
}
- if (!(newJob.progs[i].pid = fork())) {
+ if (!(newJob->progs[i].pid = fork())) {
signal(SIGTTOU, SIG_DFL);
if (nextin != 0) {
}
/* explicit redirections override pipes */
- setupRedirections(newJob.progs + i);
+ setupRedirections(newJob->progs + i);
- /* Match any built-ins here */
+ /* 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));
+ if (!strcmp(newJob->progs[i].argv[0], x->cmd)) {
+ exit (x->function(newJob, jobList));
}
}
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
- /* Handle busybox internals here */
+ /* 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) {
+ if (strcmp(newJob->progs[i].argv[0], a->name) == 0) {
int argc;
- char** argv=newJob.progs[i].argv;
+ char** argv=newJob->progs[i].argv;
for(argc=0;*argv!=NULL; argv++, argc++);
- exit((*(a->main)) (argc, newJob.progs[i].argv));
+ exit((*(a->main)) (argc, newJob->progs[i].argv));
}
a++;
}
#endif
- execvp(newJob.progs[i].argv[0], newJob.progs[i].argv);
- fatalError("sh: %s: %s\n", newJob.progs[i].argv[0],
+ 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);
+ setpgid(newJob->progs[i].pid, newJob->progs[0].pid);
if (nextin != 0)
close(nextin);
nextin = pipefds[0];
}
- newJob.pgrp = newJob.progs[0].pid;
+ newJob->pgrp = newJob->progs[0].pid;
/* find the ID for the job to use */
- newJob.jobId = 1;
+ newJob->jobId = 1;
for (job = jobList->head; job; job = job->next)
- if (job->jobId >= newJob.jobId)
- newJob.jobId = job->jobId + 1;
+ 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));
+ job = jobList->head = xmalloc(sizeof(*job));
} else {
for (job = jobList->head; job->next; job = job->next);
- job->next = malloc(sizeof(*job));
+ job->next = xmalloc(sizeof(*job));
job = job->next;
}
- *job = newJob;
+ *job = *newJob;
job->next = NULL;
job->runningProgs = job->numProgs;
job->stoppedProgs = 0;
/* 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);
+ 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)
+ if (tcsetpgrp(0, newJob->pgrp) && errno != ENOTTY)
perror("tcsetpgrp");
}
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,
+ errorMsg("error opening %s: %s\n", redir->filename,
strerror(errno));
return 1;
}
nextCommand = command;
}
- if (!parseCommand(&nextCommand, &newJob, &inBg) &&
+ if (!parseCommand(&nextCommand, &newJob, &jobList, &inBg) &&
newJob.numProgs) {
- runCommand(newJob, &jobList, inBg);
+ runCommand(&newJob, &jobList, inBg);
+ } else {
+ nextCommand=NULL;
}
} else {
/* a job is running in the foreground; wait for it */
}
free(command);
- /* return controlling TTY back to parent process group before exiting */
- if (tcsetpgrp(0, parent_pgrp))
- perror("tcsetpgrp");
-
/* return controlling TTY back to parent process group before exiting */
if (tcsetpgrp(0, parent_pgrp))
perror("tcsetpgrp");
/* initialize the cwd */
cwd = (char *) calloc(BUFSIZ, sizeof(char));
if (cwd == 0) {
- fatalError("sh: out of memory\n");
+ fatalError("out of memory\n");
}
getcwd(cwd, sizeof(char)*BUFSIZ);
#endif
//if (argv[0] && argv[0][0] == '-') {
- // shell_source("/etc/profile");
+ // builtin_source("/etc/profile");
//}
if (argc < 2) {
int i;
local_pending_command = (char *) calloc(BUFSIZ, sizeof(char));
if (local_pending_command == 0) {
- fatalError("sh: out of memory\n");
+ fatalError("out of memory\n");
}
for(i=2; i<argc; i++)
{
local_pending_command = realloc(local_pending_command,
strlen(local_pending_command) + strlen(argv[i]));
if (local_pending_command==NULL)
- fatalError("sh: commands for -c option too long\n");
+ fatalError("commands for -c option too long\n");
}
strcat(local_pending_command, argv[i]);
if ( (i + 1) < argc)
else {
input = fopen(argv[1], "r");
if (!input) {
- fatalError("sh: Couldn't open file '%s': %s\n", argv[1],
+ fatalError("Couldn't open file '%s': %s\n", argv[1],
strerror(errno));
}
}
projects / oweals / busybox.git / blobdiff