| #include <unistd.h> |
| #include <stdlib.h> |
| #include <signal.h> |
| #include <sys/wait.h> |
| #include <spawn.h> |
| #include <errno.h> |
| #include "pthread_impl.h" |
| |
| extern char **__environ; |
| |
| int system(const char *cmd) |
| { |
| pid_t pid; |
| sigset_t old, reset; |
| struct sigaction sa = { .sa_handler = SIG_IGN }, oldint, oldquit; |
| int status = -1, ret; |
| posix_spawnattr_t attr; |
| |
| pthread_testcancel(); |
| |
| if (!cmd) return 1; |
| |
| sigaction(SIGINT, &sa, &oldint); |
| sigaction(SIGQUIT, &sa, &oldquit); |
| sigaddset(&sa.sa_mask, SIGCHLD); |
| sigprocmask(SIG_BLOCK, &sa.sa_mask, &old); |
| |
| sigemptyset(&reset); |
| if (oldint.sa_handler != SIG_IGN) sigaddset(&reset, SIGINT); |
| if (oldquit.sa_handler != SIG_IGN) sigaddset(&reset, SIGQUIT); |
| posix_spawnattr_init(&attr); |
| posix_spawnattr_setsigmask(&attr, &old); |
| posix_spawnattr_setsigdefault(&attr, &reset); |
| posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETSIGDEF|POSIX_SPAWN_SETSIGMASK); |
| ret = posix_spawn(&pid, "/bin/sh", 0, &attr, |
| (char *[]){"sh", "-c", (char *)cmd, 0}, __environ); |
| posix_spawnattr_destroy(&attr); |
| |
| if (!ret) while (waitpid(pid, &status, 0)<0 && errno == EINTR); |
| sigaction(SIGINT, &oldint, NULL); |
| sigaction(SIGQUIT, &oldquit, NULL); |
| sigprocmask(SIG_SETMASK, &old, NULL); |
| |
| if (ret) errno = ret; |
| return status; |
| } |