mirror of
https://git.busybox.net/busybox.git
synced 2024-12-15 08:23:25 +08:00
Some more job control updates. It will now sucessfully background
stuff. Good luck getting things back into the foreground though... -Erik
This commit is contained in:
Eric Andersen
parent
20a3069ec0
commit
0fcd447d59
104
hush.c
104
hush.c
@ -470,48 +470,53 @@ static int builtin_export(struct child_prog *child)
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/* built-in 'fg' and 'bg' handler */
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static int builtin_fg_bg(struct child_prog *child)
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{
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int i, jobNum;
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struct pipe *job=NULL;
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int i, jobnum;
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struct pipe *pi=NULL;
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if (!child->argv[1] || child->argv[2]) {
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error_msg("%s: exactly one argument is expected\n",
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child->argv[0]);
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return EXIT_FAILURE;
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}
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if (sscanf(child->argv[1], "%%%d", &jobNum) != 1) {
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error_msg("%s: bad argument '%s'\n",
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child->argv[0], child->argv[1]);
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return EXIT_FAILURE;
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}
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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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/* If they gave us no args, assume they want the last backgrounded task */
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if (!child->argv[1]) {
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for (pi = job_list->head; pi; pi = pi->next) {
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if (pi->progs && pi->progs->pid == last_bg_pid) {
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break;
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}
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}
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if (!job) {
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error_msg("%s: unknown job %d\n",
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child->argv[0], jobNum);
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if (!pi) {
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error_msg("%s: no current job", child->argv[0]);
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return EXIT_FAILURE;
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}
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} else {
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if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
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error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
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return EXIT_FAILURE;
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}
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for (pi = job_list->head; pi; pi = pi->next) {
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if (pi->jobid == jobnum) {
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break;
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}
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}
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if (!pi) {
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error_msg("%s: %d: no such job", child->argv[0], jobnum);
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return EXIT_FAILURE;
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}
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}
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if (*child->argv[0] == 'f') {
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/* Make this job the foreground job */
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signal(SIGTTOU, SIG_IGN);
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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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if (tcsetpgrp(0, pi->pgrp) && errno != ENOTTY)
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perror_msg("tcsetpgrp");
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job_list->fg = job;
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signal(SIGTTOU, SIG_DFL);
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job_list->fg = pi;
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}
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/* Restart the processes in the job */
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for (i = 0; i < job->num_progs; i++)
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job->progs[i].is_stopped = 0;
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for (i = 0; i < pi->num_progs; i++)
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pi->progs[i].is_stopped = 0;
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kill(-job->pgrp, SIGCONT);
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kill(-pi->pgrp, SIGCONT);
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job->stopped_progs = 0;
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pi->stopped_progs = 0;
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return EXIT_SUCCESS;
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}
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@ -1055,7 +1060,7 @@ static void insert_bg_job(struct pipe *pi)
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}
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/* physically copy the struct job */
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*thejob = *pi;
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memcpy(thejob, pi, sizeof(struct pipe));
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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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@ -1103,6 +1108,7 @@ static void free_pipe(struct pipe *pi)
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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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@ -1169,14 +1175,27 @@ static void checkjobs()
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static int run_pipe_real(struct pipe *pi)
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{
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int i;
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int ctty;
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int nextin, nextout;
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int pipefds[2]; /* pipefds[0] is for reading */
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struct child_prog *child;
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struct built_in_command *x;
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ctty = -1;
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nextin = 0;
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pi->pgrp = 0;
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/* Check if we are supposed to run in the foreground */
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if (pi->followup!=PIPE_BG) {
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if ((pi->pgrp = tcgetpgrp(ctty = 2)) < 0
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&& (pi->pgrp = tcgetpgrp(ctty = 0)) < 0
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&& (pi->pgrp = tcgetpgrp(ctty = 1)) < 0)
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return errno = ENOTTY, -1;
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if (pi->pgrp < 0 && pi->pgrp != getpgrp())
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return errno = EPERM, -1;
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}
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/* Check if this is a simple builtin (not part of a pipe).
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* Builtins within pipes have to fork anyway, and are handled in
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* pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
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@ -1225,6 +1244,7 @@ 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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@ -1245,20 +1265,31 @@ static int run_pipe_real(struct pipe *pi)
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* and the pipe fd is available for dup'ing. */
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setup_redirects(child,NULL);
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pseudo_exec(child);
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}
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if (interactive) {
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if (pi->followup!=PIPE_BG) {
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/* Put our child in the process group whose leader is the
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* first process in this pipe. */
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if (pi->pgrp==0) {
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if (pi->pgrp < 0) {
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pi->pgrp = child->pid;
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}
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/* Don't check for errors. The child may be dead already,
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* in which case setpgid returns error code EACCES. */
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if (setpgid(0, pi->pgrp) == 0) {
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signal(SIGTTOU, SIG_IGN);
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tcsetpgrp(ctty, pi->pgrp);
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signal(SIGTTOU, SIG_DFL);
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}
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}
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pseudo_exec(child);
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}
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/* Put our child in the process group whose leader is the
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* first process in this pipe. */
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if (pi->pgrp < 0) {
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pi->pgrp = child->pid;
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}
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/* Don't check for errors. The child may be dead already,
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* in which case setpgid returns error code EACCES. */
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setpgid(child->pid, pi->pgrp);
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}
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/* In the non-interactive case, do nothing. Leave the children
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* with the process group that they inherited from us. */
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if (nextin != 0)
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close(nextin);
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@ -1295,13 +1326,10 @@ 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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104
shell/hush.c
104
shell/hush.c
@ -470,48 +470,53 @@ static int builtin_export(struct child_prog *child)
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/* built-in 'fg' and 'bg' handler */
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static int builtin_fg_bg(struct child_prog *child)
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{
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int i, jobNum;
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struct pipe *job=NULL;
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int i, jobnum;
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struct pipe *pi=NULL;
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if (!child->argv[1] || child->argv[2]) {
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error_msg("%s: exactly one argument is expected\n",
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child->argv[0]);
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return EXIT_FAILURE;
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}
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if (sscanf(child->argv[1], "%%%d", &jobNum) != 1) {
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error_msg("%s: bad argument '%s'\n",
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child->argv[0], child->argv[1]);
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return EXIT_FAILURE;
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}
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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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/* If they gave us no args, assume they want the last backgrounded task */
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if (!child->argv[1]) {
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for (pi = job_list->head; pi; pi = pi->next) {
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if (pi->progs && pi->progs->pid == last_bg_pid) {
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break;
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}
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}
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if (!job) {
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error_msg("%s: unknown job %d\n",
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child->argv[0], jobNum);
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if (!pi) {
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error_msg("%s: no current job", child->argv[0]);
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return EXIT_FAILURE;
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}
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} else {
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if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
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error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
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return EXIT_FAILURE;
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}
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for (pi = job_list->head; pi; pi = pi->next) {
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if (pi->jobid == jobnum) {
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break;
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}
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}
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if (!pi) {
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error_msg("%s: %d: no such job", child->argv[0], jobnum);
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return EXIT_FAILURE;
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}
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}
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if (*child->argv[0] == 'f') {
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/* Make this job the foreground job */
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signal(SIGTTOU, SIG_IGN);
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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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if (tcsetpgrp(0, pi->pgrp) && errno != ENOTTY)
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perror_msg("tcsetpgrp");
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job_list->fg = job;
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signal(SIGTTOU, SIG_DFL);
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job_list->fg = pi;
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}
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/* Restart the processes in the job */
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for (i = 0; i < job->num_progs; i++)
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job->progs[i].is_stopped = 0;
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for (i = 0; i < pi->num_progs; i++)
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pi->progs[i].is_stopped = 0;
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kill(-job->pgrp, SIGCONT);
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kill(-pi->pgrp, SIGCONT);
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job->stopped_progs = 0;
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pi->stopped_progs = 0;
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return EXIT_SUCCESS;
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}
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@ -1055,7 +1060,7 @@ static void insert_bg_job(struct pipe *pi)
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}
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/* physically copy the struct job */
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*thejob = *pi;
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memcpy(thejob, pi, sizeof(struct pipe));
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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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@ -1103,6 +1108,7 @@ static void free_pipe(struct pipe *pi)
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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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@ -1169,14 +1175,27 @@ static void checkjobs()
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static int run_pipe_real(struct pipe *pi)
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{
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int i;
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int ctty;
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int nextin, nextout;
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int pipefds[2]; /* pipefds[0] is for reading */
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struct child_prog *child;
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struct built_in_command *x;
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ctty = -1;
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nextin = 0;
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pi->pgrp = 0;
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/* Check if we are supposed to run in the foreground */
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if (pi->followup!=PIPE_BG) {
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if ((pi->pgrp = tcgetpgrp(ctty = 2)) < 0
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&& (pi->pgrp = tcgetpgrp(ctty = 0)) < 0
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&& (pi->pgrp = tcgetpgrp(ctty = 1)) < 0)
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return errno = ENOTTY, -1;
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if (pi->pgrp < 0 && pi->pgrp != getpgrp())
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return errno = EPERM, -1;
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}
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/* Check if this is a simple builtin (not part of a pipe).
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* Builtins within pipes have to fork anyway, and are handled in
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* pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
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@ -1225,6 +1244,7 @@ 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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@ -1245,20 +1265,31 @@ static int run_pipe_real(struct pipe *pi)
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* and the pipe fd is available for dup'ing. */
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setup_redirects(child,NULL);
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pseudo_exec(child);
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}
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if (interactive) {
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if (pi->followup!=PIPE_BG) {
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/* Put our child in the process group whose leader is the
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* first process in this pipe. */
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if (pi->pgrp==0) {
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if (pi->pgrp < 0) {
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pi->pgrp = child->pid;
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}
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/* Don't check for errors. The child may be dead already,
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* in which case setpgid returns error code EACCES. */
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if (setpgid(0, pi->pgrp) == 0) {
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signal(SIGTTOU, SIG_IGN);
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tcsetpgrp(ctty, pi->pgrp);
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signal(SIGTTOU, SIG_DFL);
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}
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}
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pseudo_exec(child);
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}
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/* Put our child in the process group whose leader is the
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* first process in this pipe. */
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if (pi->pgrp < 0) {
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pi->pgrp = child->pid;
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}
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/* Don't check for errors. The child may be dead already,
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* in which case setpgid returns error code EACCES. */
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setpgid(child->pid, pi->pgrp);
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}
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/* In the non-interactive case, do nothing. Leave the children
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* with the process group that they inherited from us. */
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if (nextin != 0)
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close(nextin);
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@ -1295,13 +1326,10 @@ 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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