diff options
Diffstat (limited to 'sysdeps/posix/system.c')
| -rw-r--r-- | sysdeps/posix/system.c | 37 |
1 files changed, 11 insertions, 26 deletions
diff --git a/sysdeps/posix/system.c b/sysdeps/posix/system.c index d7e0bcf254..6df7984889 100644 --- a/sysdeps/posix/system.c +++ b/sysdeps/posix/system.c @@ -52,18 +52,9 @@ do_system (const char *line) if (__sigaction (SIGQUIT, &sa, &quit) < 0) { save = errno; - (void) __sigaction (SIGINT, &intr, (struct sigaction *) NULL); - __set_errno (save); - return -1; + goto out_restore_sigint; } -#ifndef WAITPID_CANNOT_BLOCK_SIGCHLD - -/* SCO 3.2v4 has a bug where `waitpid' will never return if SIGCHLD is - blocked. This makes it impossible for `system' to be implemented in - compliance with POSIX.2-1992. They have acknowledged that this is a bug - but I have not seen nor heard of any forthcoming fix. */ - __sigemptyset (&block); __sigaddset (&block, SIGCHLD); save = errno; @@ -74,16 +65,13 @@ do_system (const char *line) else { save = errno; - (void) __sigaction (SIGINT, &intr, (struct sigaction *) NULL); (void) __sigaction (SIGQUIT, &quit, (struct sigaction *) NULL); + out_restore_sigint: + (void) __sigaction (SIGINT, &intr, (struct sigaction *) NULL); __set_errno (save); return -1; } } -# define UNBLOCK __sigprocmask (SIG_SETMASK, &omask, (sigset_t *) NULL) -#else -# define UNBLOCK 0 -#endif pid = __fork (); if (pid == (pid_t) 0) @@ -98,7 +86,7 @@ do_system (const char *line) /* Restore the signals. */ (void) __sigaction (SIGINT, &intr, (struct sigaction *) NULL); (void) __sigaction (SIGQUIT, &quit, (struct sigaction *) NULL); - (void) UNBLOCK; + (void) __sigprocmask (SIG_SETMASK, &omask, (sigset_t *) NULL); /* Exec the shell. */ (void) __execve (SHELL_PATH, (char *const *) new_argv, __environ); @@ -125,25 +113,22 @@ do_system (const char *line) } while (child != pid); #else - int n; - - do - n = __waitpid (pid, &status, 0); - while (n == -1 && errno == EINTR); - - if (n != pid) + if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, 0)) != pid) status = -1; #endif } save = errno; - if ((__sigaction (SIGINT, &intr, (struct sigaction *) NULL) | - __sigaction (SIGQUIT, &quit, (struct sigaction *) NULL) | - UNBLOCK) != 0) + if ((__sigaction (SIGINT, &intr, (struct sigaction *) NULL) + | __sigaction (SIGQUIT, &quit, (struct sigaction *) NULL) + | __sigprocmask (SIG_SETMASK, &omask, (sigset_t *) NULL)) != 0) { +#ifndef _LIBC + /* glibc cannot be used on systems without waitpid. */ if (errno == ENOSYS) __set_errno (save); else +#endif return -1; } |