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hush: add "wait -n" bashism

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2019-03-26 18:34:06 +01:00
parent 3c6f3336e1
commit 4d1c5149a0
1 changed files with 17 additions and 1 deletions
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18
shell/hush.c
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@ -8763,7 +8763,11 @@ static int checkjobs(struct pipe *fg_pipe, pid_t waitfor_pid)
/* fg_pipe exited or stopped */
break;
}
if (childpid == waitfor_pid) {
if (childpid == waitfor_pid /* "wait PID" */
#if ENABLE_HUSH_BASH_COMPAT
|| -1 == waitfor_pid /* "wait -n" (wait for any one child) */
#endif
) {
debug_printf_exec("childpid==waitfor_pid:%d status:0x%08x\n", childpid, status);
rcode = WEXITSTATUS(status);
if (WIFSIGNALED(status))
@ -11471,6 +11475,12 @@ static int wait_for_child_or_signal(struct pipe *waitfor_pipe, pid_t waitfor_pid
ret--;
if (ret < 0) /* if ECHILD, may need to fix "ret" */
ret = 0;
#if ENABLE_HUSH_BASH_COMPAT
if (waitfor_pid == -1 && errno == ECHILD) {
/* exitcode of "wait -n" with no children is 127, not 0 */
ret = 127;
}
#endif
sigprocmask(SIG_SETMASK, &oldset, NULL);
break;
}
@ -11499,6 +11509,12 @@ static int FAST_FUNC builtin_wait(char **argv)
int status;
argv = skip_dash_dash(argv);
#if ENABLE_HUSH_BASH_COMPAT
if (argv[0] && !argv[1] && strcmp(argv[0], "-n") == 0) {
/* wait -n */
return wait_for_child_or_signal(NULL, -1 /*(no job, wait for one child)*/);
}
#endif
if (argv[0] == NULL) {
/* Don't care about wait results */
/* Note 1: must wait until there are no more children */