mirror of
https://git.busybox.net/busybox.git
synced 2024-12-15 16:33:22 +08:00
First pass at getting job control working. This gets the infrastructure
in place, but something is still missing/wrong in there. Testing with 'grep foo &' seems to put _hush_ into the background. Pondering... -Erik
This commit is contained in:
Eric Andersen
parent
1c8a59ab95
commit
bafd94f154
155
hush.c
155
hush.c
@ -213,7 +213,6 @@ struct pipe {
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int job_context; /* bitmask defining current context */
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pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
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reserved_style r_mode; /* supports if, for, while, until */
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struct jobset *job_list;
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};
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struct jobset {
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@ -244,7 +243,7 @@ static int fake_mode=0;
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static int interactive=0;
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static struct close_me *close_me_head = NULL;
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static char *cwd;
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/* static struct jobset job_list = { NULL, NULL }; */
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static struct jobset *job_list;
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static unsigned int last_bg_pid=0;
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static char *PS1;
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static char *PS2 = "> ";
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@ -377,6 +376,11 @@ static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *in
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static int parse_stream_outer(struct in_str *inp);
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static int parse_string_outer(const char *s);
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static int parse_file_outer(FILE *f);
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/* job management: */
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static void checkjobs();
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static void insert_bg_job(struct pipe *pi);
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static void remove_bg_job(struct pipe *pi);
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static void free_pipe(struct pipe *pi);
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/* Table of built-in functions. They can be forked or not, depending on
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* context: within pipes, they fork. As simple commands, they do not.
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@ -481,7 +485,7 @@ static int builtin_fg_bg(struct child_prog *child)
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return EXIT_FAILURE;
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}
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for (job = child->family->job_list->head; job; job = job->next) {
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for (job = job_list->head; job; job = job->next) {
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if (job->jobid == jobNum) {
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break;
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}
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@ -498,7 +502,7 @@ static int builtin_fg_bg(struct child_prog *child)
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/* suppress messages when run from /linuxrc mag@sysgo.de */
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if (tcsetpgrp(0, job->pgrp) && errno != ENOTTY)
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perror_msg("tcsetpgrp");
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child->family->job_list->fg = job;
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job_list->fg = job;
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}
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/* Restart the processes in the job */
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@ -533,7 +537,7 @@ static int builtin_jobs(struct child_prog *child)
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struct pipe *job;
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char *status_string;
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for (job = child->family->job_list->head; job; job = job->next) {
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for (job = job_list->head; job; job = job->next) {
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if (job->running_progs == job->stopped_progs)
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status_string = "Stopped";
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else
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@ -1031,6 +1035,121 @@ static void pseudo_exec(struct child_prog *child)
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}
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}
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static void insert_bg_job(struct pipe *pi)
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{
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struct pipe *thejob;
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/* Linear search for the ID of the job to use */
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pi->jobid = 1;
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for (thejob = job_list->head; thejob; thejob = thejob->next)
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if (thejob->jobid >= pi->jobid)
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pi->jobid = thejob->jobid + 1;
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/* add thejob to the list of running jobs */
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if (!job_list->head) {
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thejob = job_list->head = xmalloc(sizeof(*thejob));
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} else {
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for (thejob = job_list->head; thejob->next; thejob = thejob->next) /* nothing */;
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thejob->next = xmalloc(sizeof(*thejob));
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thejob = thejob->next;
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}
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/* physically copy the struct job */
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*thejob = *pi;
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thejob->next = NULL;
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thejob->running_progs = thejob->num_progs;
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thejob->stopped_progs = 0;
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/* we don't wait for background thejobs to return -- append it
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to the list of backgrounded thejobs and leave it alone */
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printf("[%d] %d\n", pi->jobid, pi->pgrp);
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last_bg_pid = pi->pgrp;
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}
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/* remove a backgrounded job from a jobset */
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static void remove_bg_job(struct pipe *pi)
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{
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struct pipe *prev_pipe;
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free_pipe(pi);
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if (pi == job_list->head) {
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job_list->head = pi->next;
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} else {
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prev_pipe = job_list->head;
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while (prev_pipe->next != pi)
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prev_pipe = prev_pipe->next;
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prev_pipe->next = pi->next;
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}
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free(pi);
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}
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/* free up all memory from a pipe */
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static void free_pipe(struct pipe *pi)
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{
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int i;
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for (i = 0; i < pi->num_progs; i++) {
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free(pi->progs[i].argv);
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if (pi->progs[i].redirects)
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free(pi->progs[i].redirects);
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}
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if (pi->progs)
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free(pi->progs);
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if (pi->text)
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free(pi->text);
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if (pi->cmdbuf)
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free(pi->cmdbuf);
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memset(pi, 0, sizeof(struct pipe));
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}
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/* Checks to see if any background processes have exited -- if they
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have, figure out why and see if a job has completed */
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static void checkjobs()
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{
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int status;
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int prognum = 0;
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struct pipe *pi;
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pid_t childpid;
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while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) {
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for (pi = job_list->head; pi; pi = pi->next) {
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prognum = 0;
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while (prognum < pi->num_progs &&
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pi->progs[prognum].pid != childpid) prognum++;
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if (prognum < pi->num_progs)
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break;
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}
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if (WIFEXITED(status) || WIFSIGNALED(status)) {
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/* child exited */
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pi->running_progs--;
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pi->progs[prognum].pid = 0;
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if (!pi->running_progs) {
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printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
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remove_bg_job(pi);
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}
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} else {
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/* child stopped */
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pi->stopped_progs++;
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pi->progs[prognum].is_stopped = 1;
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if (pi->stopped_progs == pi->num_progs) {
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printf(JOB_STATUS_FORMAT, pi->jobid, "Stopped",
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pi->text);
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}
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}
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}
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/* move the shell to the foreground */
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if (tcsetpgrp(0, getpgrp()) && errno != ENOTTY)
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perror_msg("tcsetpgrp");
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if (childpid == -1 && errno != ECHILD)
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perror_msg("waitpid");
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}
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/* run_pipe_real() starts all the jobs, but doesn't wait for anything
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* to finish. See pipe_wait().
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*
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@ -1106,6 +1225,8 @@ static int run_pipe_real(struct pipe *pi)
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/* XXX test for failed fork()? */
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if (!(child->pid = fork())) {
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signal(SIGTTOU, SIG_DFL);
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close_all();
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if (nextin != 0) {
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@ -1174,22 +1295,25 @@ static int run_list_real(struct pipe *pi)
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/* XXX check bash's behavior with nontrivial pipes */
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/* XXX compute jobid */
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/* XXX what does bash do with attempts to background builtins? */
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#if 0
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printf("[%d] %d\n", pi->jobid, pi->pgrp);
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last_bg_pid = pi->pgrp;
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#endif
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insert_bg_job(pi);
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rcode = EXIT_SUCCESS;
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} else {
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if (interactive) {
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/* move the new process group into the foreground */
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/* suppress messages when run from /linuxrc mag@sysgo.de */
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signal(SIGTTIN, SIG_IGN);
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signal(SIGTTOU, SIG_IGN);
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//signal(SIGTTIN, SIG_IGN);
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//signal(SIGTTOU, SIG_IGN);
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if (tcsetpgrp(0, pi->pgrp) && errno != ENOTTY)
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perror_msg("tcsetpgrp");
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rcode = pipe_wait(pi);
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if (tcsetpgrp(0, getpgrp()) && errno != ENOTTY)
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perror_msg("tcsetpgrp");
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signal(SIGTTIN, SIG_DFL);
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signal(SIGTTOU, SIG_DFL);
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//signal(SIGTTIN, SIG_DFL);
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//signal(SIGTTOU, SIG_DFL);
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} else {
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rcode = pipe_wait(pi);
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}
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@ -1202,6 +1326,7 @@ static int run_list_real(struct pipe *pi)
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skip_more_in_this_rmode=rmode;
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/* return rcode; */ /* XXX broken if list is part of if/then/else */
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}
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checkjobs();
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return rcode;
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}
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@ -1298,7 +1423,7 @@ static int globhack(const char *src, int flags, glob_t *pglob)
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int cnt, pathc;
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const char *s;
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char *dest;
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for (cnt=1, s=src; s && *s; s++) {
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for (cnt=1, s=src; *s; s++) {
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if (*s == '\\') s++;
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cnt++;
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}
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@ -1315,7 +1440,7 @@ static int globhack(const char *src, int flags, glob_t *pglob)
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if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
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pglob->gl_pathv[pathc-1]=dest;
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pglob->gl_pathv[pathc]=NULL;
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for (s=src; s && *s; s++, dest++) {
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for (s=src; *s; s++, dest++) {
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if (*s == '\\') s++;
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*dest = *s;
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}
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@ -1482,8 +1607,6 @@ int reserved_word(o_string *dest, struct p_context *ctx)
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{ "done", RES_DONE, FLAG_END }
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};
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struct reserved_combo *r;
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if (dest->data == NULL)
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return 0;
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for (r=reserved_list;
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#define NRES sizeof(reserved_list)/sizeof(struct reserved_combo)
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r<reserved_list+NRES; r++) {
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@ -2080,6 +2203,8 @@ int shell_main(int argc, char **argv)
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{
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int opt;
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FILE *input;
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struct jobset joblist_end = { NULL, NULL };
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job_list = &joblist_end;
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last_return_code=EXIT_SUCCESS;
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@ -2087,6 +2212,10 @@ int shell_main(int argc, char **argv)
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global_argc = argc;
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global_argv = argv;
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/* don't pay any attention to this signal; it just confuses
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things and isn't really meant for shells anyway */
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signal(SIGTTOU, SIG_IGN);
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if (argv[0] && argv[0][0] == '-') {
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debug_printf("\nsourcing /etc/profile\n");
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input = xfopen("/etc/profile", "r");
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155
shell/hush.c
155
shell/hush.c
@ -213,7 +213,6 @@ struct pipe {
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int job_context; /* bitmask defining current context */
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pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
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reserved_style r_mode; /* supports if, for, while, until */
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struct jobset *job_list;
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};
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struct jobset {
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@ -244,7 +243,7 @@ static int fake_mode=0;
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static int interactive=0;
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static struct close_me *close_me_head = NULL;
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static char *cwd;
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/* static struct jobset job_list = { NULL, NULL }; */
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static struct jobset *job_list;
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static unsigned int last_bg_pid=0;
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static char *PS1;
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static char *PS2 = "> ";
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@ -377,6 +376,11 @@ static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *in
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static int parse_stream_outer(struct in_str *inp);
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static int parse_string_outer(const char *s);
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static int parse_file_outer(FILE *f);
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/* job management: */
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static void checkjobs();
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static void insert_bg_job(struct pipe *pi);
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static void remove_bg_job(struct pipe *pi);
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static void free_pipe(struct pipe *pi);
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/* Table of built-in functions. They can be forked or not, depending on
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* context: within pipes, they fork. As simple commands, they do not.
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@ -481,7 +485,7 @@ static int builtin_fg_bg(struct child_prog *child)
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return EXIT_FAILURE;
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}
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for (job = child->family->job_list->head; job; job = job->next) {
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for (job = job_list->head; job; job = job->next) {
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if (job->jobid == jobNum) {
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break;
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}
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@ -498,7 +502,7 @@ static int builtin_fg_bg(struct child_prog *child)
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/* suppress messages when run from /linuxrc mag@sysgo.de */
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if (tcsetpgrp(0, job->pgrp) && errno != ENOTTY)
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perror_msg("tcsetpgrp");
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child->family->job_list->fg = job;
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job_list->fg = job;
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}
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/* Restart the processes in the job */
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@ -533,7 +537,7 @@ static int builtin_jobs(struct child_prog *child)
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struct pipe *job;
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char *status_string;
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for (job = child->family->job_list->head; job; job = job->next) {
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for (job = job_list->head; job; job = job->next) {
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if (job->running_progs == job->stopped_progs)
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status_string = "Stopped";
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else
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@ -1031,6 +1035,121 @@ static void pseudo_exec(struct child_prog *child)
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}
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}
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static void insert_bg_job(struct pipe *pi)
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{
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struct pipe *thejob;
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/* Linear search for the ID of the job to use */
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pi->jobid = 1;
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for (thejob = job_list->head; thejob; thejob = thejob->next)
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if (thejob->jobid >= pi->jobid)
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pi->jobid = thejob->jobid + 1;
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/* add thejob to the list of running jobs */
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if (!job_list->head) {
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thejob = job_list->head = xmalloc(sizeof(*thejob));
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} else {
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for (thejob = job_list->head; thejob->next; thejob = thejob->next) /* nothing */;
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thejob->next = xmalloc(sizeof(*thejob));
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thejob = thejob->next;
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}
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/* physically copy the struct job */
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*thejob = *pi;
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thejob->next = NULL;
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thejob->running_progs = thejob->num_progs;
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thejob->stopped_progs = 0;
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/* we don't wait for background thejobs to return -- append it
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to the list of backgrounded thejobs and leave it alone */
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printf("[%d] %d\n", pi->jobid, pi->pgrp);
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last_bg_pid = pi->pgrp;
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}
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/* remove a backgrounded job from a jobset */
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static void remove_bg_job(struct pipe *pi)
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{
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struct pipe *prev_pipe;
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free_pipe(pi);
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if (pi == job_list->head) {
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job_list->head = pi->next;
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} else {
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prev_pipe = job_list->head;
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while (prev_pipe->next != pi)
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prev_pipe = prev_pipe->next;
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prev_pipe->next = pi->next;
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}
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free(pi);
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}
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/* free up all memory from a pipe */
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static void free_pipe(struct pipe *pi)
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{
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int i;
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for (i = 0; i < pi->num_progs; i++) {
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free(pi->progs[i].argv);
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if (pi->progs[i].redirects)
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free(pi->progs[i].redirects);
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}
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if (pi->progs)
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free(pi->progs);
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if (pi->text)
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free(pi->text);
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if (pi->cmdbuf)
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free(pi->cmdbuf);
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memset(pi, 0, sizeof(struct pipe));
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}
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/* Checks to see if any background processes have exited -- if they
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have, figure out why and see if a job has completed */
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static void checkjobs()
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{
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int status;
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int prognum = 0;
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struct pipe *pi;
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pid_t childpid;
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while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) {
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for (pi = job_list->head; pi; pi = pi->next) {
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prognum = 0;
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while (prognum < pi->num_progs &&
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pi->progs[prognum].pid != childpid) prognum++;
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if (prognum < pi->num_progs)
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break;
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}
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if (WIFEXITED(status) || WIFSIGNALED(status)) {
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/* child exited */
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pi->running_progs--;
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pi->progs[prognum].pid = 0;
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if (!pi->running_progs) {
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printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
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remove_bg_job(pi);
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}
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} else {
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/* child stopped */
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pi->stopped_progs++;
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pi->progs[prognum].is_stopped = 1;
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if (pi->stopped_progs == pi->num_progs) {
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printf(JOB_STATUS_FORMAT, pi->jobid, "Stopped",
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pi->text);
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}
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}
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}
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/* move the shell to the foreground */
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if (tcsetpgrp(0, getpgrp()) && errno != ENOTTY)
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perror_msg("tcsetpgrp");
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if (childpid == -1 && errno != ECHILD)
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perror_msg("waitpid");
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||||
}
|
||||
|
||||
/* run_pipe_real() starts all the jobs, but doesn't wait for anything
|
||||
* to finish. See pipe_wait().
|
||||
*
|
||||
@ -1106,6 +1225,8 @@ static int run_pipe_real(struct pipe *pi)
|
||||
|
||||
/* XXX test for failed fork()? */
|
||||
if (!(child->pid = fork())) {
|
||||
signal(SIGTTOU, SIG_DFL);
|
||||
|
||||
close_all();
|
||||
|
||||
if (nextin != 0) {
|
||||
@ -1174,22 +1295,25 @@ static int run_list_real(struct pipe *pi)
|
||||
/* XXX check bash's behavior with nontrivial pipes */
|
||||
/* XXX compute jobid */
|
||||
/* XXX what does bash do with attempts to background builtins? */
|
||||
#if 0
|
||||
printf("[%d] %d\n", pi->jobid, pi->pgrp);
|
||||
last_bg_pid = pi->pgrp;
|
||||
#endif
|
||||
insert_bg_job(pi);
|
||||
rcode = EXIT_SUCCESS;
|
||||
} else {
|
||||
if (interactive) {
|
||||
/* move the new process group into the foreground */
|
||||
/* suppress messages when run from /linuxrc mag@sysgo.de */
|
||||
signal(SIGTTIN, SIG_IGN);
|
||||
signal(SIGTTOU, SIG_IGN);
|
||||
//signal(SIGTTIN, SIG_IGN);
|
||||
//signal(SIGTTOU, SIG_IGN);
|
||||
if (tcsetpgrp(0, pi->pgrp) && errno != ENOTTY)
|
||||
perror_msg("tcsetpgrp");
|
||||
rcode = pipe_wait(pi);
|
||||
if (tcsetpgrp(0, getpgrp()) && errno != ENOTTY)
|
||||
perror_msg("tcsetpgrp");
|
||||
signal(SIGTTIN, SIG_DFL);
|
||||
signal(SIGTTOU, SIG_DFL);
|
||||
//signal(SIGTTIN, SIG_DFL);
|
||||
//signal(SIGTTOU, SIG_DFL);
|
||||
} else {
|
||||
rcode = pipe_wait(pi);
|
||||
}
|
||||
@ -1202,6 +1326,7 @@ static int run_list_real(struct pipe *pi)
|
||||
skip_more_in_this_rmode=rmode;
|
||||
/* return rcode; */ /* XXX broken if list is part of if/then/else */
|
||||
}
|
||||
checkjobs();
|
||||
return rcode;
|
||||
}
|
||||
|
||||
@ -1298,7 +1423,7 @@ static int globhack(const char *src, int flags, glob_t *pglob)
|
||||
int cnt, pathc;
|
||||
const char *s;
|
||||
char *dest;
|
||||
for (cnt=1, s=src; s && *s; s++) {
|
||||
for (cnt=1, s=src; *s; s++) {
|
||||
if (*s == '\\') s++;
|
||||
cnt++;
|
||||
}
|
||||
@ -1315,7 +1440,7 @@ static int globhack(const char *src, int flags, glob_t *pglob)
|
||||
if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
|
||||
pglob->gl_pathv[pathc-1]=dest;
|
||||
pglob->gl_pathv[pathc]=NULL;
|
||||
for (s=src; s && *s; s++, dest++) {
|
||||
for (s=src; *s; s++, dest++) {
|
||||
if (*s == '\\') s++;
|
||||
*dest = *s;
|
||||
}
|
||||
@ -1482,8 +1607,6 @@ int reserved_word(o_string *dest, struct p_context *ctx)
|
||||
{ "done", RES_DONE, FLAG_END }
|
||||
};
|
||||
struct reserved_combo *r;
|
||||
if (dest->data == NULL)
|
||||
return 0;
|
||||
for (r=reserved_list;
|
||||
#define NRES sizeof(reserved_list)/sizeof(struct reserved_combo)
|
||||
r<reserved_list+NRES; r++) {
|
||||
@ -2080,6 +2203,8 @@ int shell_main(int argc, char **argv)
|
||||
{
|
||||
int opt;
|
||||
FILE *input;
|
||||
struct jobset joblist_end = { NULL, NULL };
|
||||
job_list = &joblist_end;
|
||||
|
||||
last_return_code=EXIT_SUCCESS;
|
||||
|
||||
@ -2087,6 +2212,10 @@ int shell_main(int argc, char **argv)
|
||||
global_argc = argc;
|
||||
global_argv = argv;
|
||||
|
||||
/* don't pay any attention to this signal; it just confuses
|
||||
things and isn't really meant for shells anyway */
|
||||
signal(SIGTTOU, SIG_IGN);
|
||||
|
||||
if (argv[0] && argv[0][0] == '-') {
|
||||
debug_printf("\nsourcing /etc/profile\n");
|
||||
input = xfopen("/etc/profile", "r");
|
||||
|
||||
Loading…
Reference in New Issue
Block a user