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hush: implement "wait %jobspec"
function old new delta parse_jobspec - 83 +83 job_exited_or_stopped - 79 +79 builtin_wait 236 302 +66 wait_for_child_or_signal 199 228 +29 checkjobs 142 158 +16 builtin_jobs 59 68 +9 process_wait_result 453 408 -45 builtin_fg_bg 272 203 -69 ------------------------------------------------------------------------------ (add/remove: 2/0 grow/shrink: 4/2 up/down: 282/-114) Total: 168 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
4e1c8b4f6a
commit
62b717b75e
117
shell/hush.c
117
shell/hush.c
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@ -45,7 +45,6 @@
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* tilde expansion
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* aliases
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* kill %jobspec
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* wait %jobspec
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* follow IFS rules more precisely, including update semantics
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* builtins mandated by standards we don't support:
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* [un]alias, command, fc, getopts, newgrp, readonly, times
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@ -7065,6 +7064,27 @@ static void delete_finished_bg_job(struct pipe *pi)
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}
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#endif /* JOB */
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static int job_exited_or_stopped(struct pipe *pi)
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{
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int rcode, i;
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if (pi->alive_cmds != pi->stopped_cmds)
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return -1;
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/* All processes in fg pipe have exited or stopped */
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rcode = 0;
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i = pi->num_cmds;
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while (--i >= 0) {
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rcode = pi->cmds[i].cmd_exitcode;
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/* usually last process gives overall exitstatus,
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* but with "set -o pipefail", last *failed* process does */
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if (G.o_opt[OPT_O_PIPEFAIL] == 0 || rcode != 0)
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break;
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}
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IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
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return rcode;
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}
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static int process_wait_result(struct pipe *fg_pipe, pid_t childpid, int status)
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{
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#if ENABLE_HUSH_JOB
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@ -7088,7 +7108,10 @@ static int process_wait_result(struct pipe *fg_pipe, pid_t childpid, int status)
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/* Were we asked to wait for a fg pipe? */
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if (fg_pipe) {
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i = fg_pipe->num_cmds;
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while (--i >= 0) {
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int rcode;
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debug_printf_jobs("check pid %d\n", fg_pipe->cmds[i].pid);
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if (fg_pipe->cmds[i].pid != childpid)
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continue;
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@ -7117,18 +7140,8 @@ static int process_wait_result(struct pipe *fg_pipe, pid_t childpid, int status)
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}
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debug_printf_jobs("fg_pipe: alive_cmds %d stopped_cmds %d\n",
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fg_pipe->alive_cmds, fg_pipe->stopped_cmds);
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if (fg_pipe->alive_cmds == fg_pipe->stopped_cmds) {
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/* All processes in fg pipe have exited or stopped */
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int rcode = 0;
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i = fg_pipe->num_cmds;
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while (--i >= 0) {
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rcode = fg_pipe->cmds[i].cmd_exitcode;
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/* usually last process gives overall exitstatus,
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* but with "set -o pipefail", last *failed* process does */
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if (G.o_opt[OPT_O_PIPEFAIL] == 0 || rcode != 0)
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break;
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}
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IF_HAS_KEYWORDS(if (fg_pipe->pi_inverted) rcode = !rcode;)
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rcode = job_exited_or_stopped(fg_pipe);
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if (rcode >= 0) {
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/* Note: *non-interactive* bash does not continue if all processes in fg pipe
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* are stopped. Testcase: "cat | cat" in a script (not on command line!)
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* and "killall -STOP cat" */
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@ -7185,9 +7198,18 @@ static int process_wait_result(struct pipe *fg_pipe, pid_t childpid, int status)
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/* Check to see if any processes have exited -- if they have,
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* figure out why and see if a job has completed.
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* Alternatively (fg_pipe == NULL, waitfor_pid != 0),
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* wait for a specific pid to complete, return exitcode+1
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* (this allows to distinguish zero as "no children exited" result).
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*
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* If non-NULL fg_pipe: wait for its completion or stop.
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* Return its exitcode or zero if stopped.
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*
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* Alternatively (fg_pipe == NULL, waitfor_pid != 0):
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* waitpid(WNOHANG), if waitfor_pid exits or stops, return exitcode+1,
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* else return <0 if waitpid errors out (e.g. ECHILD: nothing to wait for)
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* or 0 if no children changed status.
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*
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* Alternatively (fg_pipe == NULL, waitfor_pid == 0),
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* return <0 if waitpid errors out (e.g. ECHILD: nothing to wait for)
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* or 0 if no children changed status.
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*/
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static int checkjobs(struct pipe *fg_pipe, pid_t waitfor_pid)
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{
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@ -7256,9 +7278,13 @@ static int checkjobs(struct pipe *fg_pipe, pid_t waitfor_pid)
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break;
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}
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if (childpid == waitfor_pid) {
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debug_printf_exec("childpid==waitfor_pid:%d status:0x%08x\n", childpid, status);
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rcode = WEXITSTATUS(status);
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if (WIFSIGNALED(status))
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rcode = 128 + WTERMSIG(status);
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if (WIFSTOPPED(status))
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/* bash: "cmd & wait $!" and cmd stops: $? = 128 + stopsig */
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rcode = 128 + WSTOPSIG(status);
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rcode++;
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break; /* "wait PID" called us, give it exitcode+1 */
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}
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@ -9329,6 +9355,7 @@ static int FAST_FUNC builtin_jobs(char **argv UNUSED_PARAM)
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struct pipe *job;
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const char *status_string;
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checkjobs(NULL, 0 /*(no pid to wait for)*/);
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for (job = G.job_list; job; job = job->next) {
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if (job->alive_cmds == job->stopped_cmds)
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status_string = "Stopped";
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@ -9481,12 +9508,15 @@ static int FAST_FUNC builtin_umask(char **argv)
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}
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/* http://www.opengroup.org/onlinepubs/9699919799/utilities/wait.html */
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static int wait_for_child_or_signal(pid_t waitfor_pid)
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#if !ENABLE_HUSH_JOB
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# define wait_for_child_or_signal(pipe,pid) wait_for_child_or_signal(pid)
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#endif
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static int wait_for_child_or_signal(struct pipe *waitfor_pipe, pid_t waitfor_pid)
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{
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int ret = 0;
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for (;;) {
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int sig;
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sigset_t oldset, allsigs;
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sigset_t oldset;
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/* waitpid is not interruptible by SA_RESTARTed
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* signals which we use. Thus, this ugly dance:
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@ -9495,10 +9525,10 @@ static int wait_for_child_or_signal(pid_t waitfor_pid)
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/* Make sure possible SIGCHLD is stored in kernel's
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* pending signal mask before we call waitpid.
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* Or else we may race with SIGCHLD, lose it,
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* and get stuck in sigwaitinfo...
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* and get stuck in sigsuspend...
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*/
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sigfillset(&allsigs);
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sigprocmask(SIG_SETMASK, &allsigs, &oldset);
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sigfillset(&oldset); /* block all signals, remember old set */
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sigprocmask(SIG_SETMASK, &oldset, &oldset);
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if (!sigisemptyset(&G.pending_set)) {
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/* Crap! we raced with some signal! */
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@ -9507,19 +9537,31 @@ static int wait_for_child_or_signal(pid_t waitfor_pid)
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}
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/*errno = 0; - checkjobs does this */
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/* Can't pass waitfor_pipe into checkjobs(): it won't be interruptible */
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ret = checkjobs(NULL, waitfor_pid); /* waitpid(WNOHANG) inside */
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debug_printf_exec("checkjobs:%d\n", ret);
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#if ENABLE_HUSH_JOB
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if (waitfor_pipe) {
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int rcode = job_exited_or_stopped(waitfor_pipe);
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debug_printf_exec("job_exited_or_stopped:%d\n", rcode);
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if (rcode >= 0) {
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ret = rcode;
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sigprocmask(SIG_SETMASK, &oldset, NULL);
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break;
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}
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}
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#endif
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/* if ECHILD, there are no children (ret is -1 or 0) */
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/* if ret == 0, no children changed state */
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/* if ret != 0, it's exitcode+1 of exited waitfor_pid child */
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if (errno == ECHILD || ret--) {
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if (ret < 0) /* if ECHILD, may need to fix */
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if (errno == ECHILD || ret) {
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ret--;
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if (ret < 0) /* if ECHILD, may need to fix "ret" */
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ret = 0;
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sigprocmask(SIG_SETMASK, &oldset, NULL);
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break;
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}
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/* Wait for SIGCHLD or any other signal */
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//sig = sigwaitinfo(&allsigs, NULL);
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/* It is vitally important for sigsuspend that SIGCHLD has non-DFL handler! */
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/* Note: sigsuspend invokes signal handler */
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sigsuspend(&oldset);
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@ -9544,6 +9586,7 @@ static int FAST_FUNC builtin_wait(char **argv)
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{
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int ret;
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int status;
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struct pipe *wait_pipe = NULL;
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argv = skip_dash_dash(argv);
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if (argv[0] == NULL) {
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@ -9563,18 +9606,27 @@ static int FAST_FUNC builtin_wait(char **argv)
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* ^C <-- after ~4 sec from keyboard
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* $
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*/
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return wait_for_child_or_signal(0 /*(no pid to wait for)*/);
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return wait_for_child_or_signal(NULL, 0 /*(no job and no pid to wait for)*/);
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}
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/* TODO: support "wait %jobspec" */
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do {
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pid_t pid = bb_strtou(*argv, NULL, 10);
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if (errno || pid <= 0) {
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#if ENABLE_HUSH_JOB
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if (argv[0][0] == '%') {
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wait_pipe = parse_jobspec(*argv);
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if (wait_pipe) {
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pid = - wait_pipe->pgrp;
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goto do_wait;
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}
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}
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#endif
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/* mimic bash message */
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bb_error_msg("wait: '%s': not a pid or valid job spec", *argv);
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ret = EXIT_FAILURE;
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continue; /* bash checks all argv[] */
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}
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IF_HUSH_JOB(do_wait:)
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/* Do we have such child? */
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ret = waitpid(pid, &status, WNOHANG);
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if (ret < 0) {
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@ -9599,13 +9651,20 @@ static int FAST_FUNC builtin_wait(char **argv)
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}
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if (ret == 0) {
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/* Yes, and it still runs */
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ret = wait_for_child_or_signal(pid);
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ret = wait_for_child_or_signal(wait_pipe, wait_pipe ? 0 : pid);
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} else {
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/* Yes, and it just exited */
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process_wait_result(NULL, pid, status);
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process_wait_result(NULL, ret, status);
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ret = WEXITSTATUS(status);
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if (WIFSIGNALED(status))
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ret = 128 + WTERMSIG(status);
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#if ENABLE_HUSH_JOB
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if (wait_pipe) {
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ret = job_exited_or_stopped(wait_pipe);
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if (ret < 0)
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goto do_wait;
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}
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#endif
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}
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} while (*++argv);
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