1#include <unistd.h> 2#include <stdlib.h> 3#include <signal.h> 4#include <sys/wait.h> 5#include <spawn.h> 6#include <errno.h> 7#include "pthread_impl.h" 8#include "libc.h" 9 10extern char **__environ; 11 12int system(const char *cmd) 13{ 14 pid_t pid; 15 sigset_t old, reset; 16 struct sigaction sa = { .sa_handler = SIG_IGN }, oldint, oldquit; 17 int status = 0x7f00, ret; 18 posix_spawnattr_t attr; 19 20 pthread_testcancel(); 21 22 if (!cmd) return 1; 23 24 sigaction(SIGINT, &sa, &oldint); 25 sigaction(SIGQUIT, &sa, &oldquit); 26 sigaddset(&sa.sa_mask, SIGCHLD); 27 sigprocmask(SIG_BLOCK, &sa.sa_mask, &old); 28 29 sigemptyset(&reset); 30 if (oldint.sa_handler != SIG_IGN) sigaddset(&reset, SIGINT); 31 if (oldquit.sa_handler != SIG_IGN) sigaddset(&reset, SIGQUIT); 32 posix_spawnattr_init(&attr); 33 posix_spawnattr_setsigmask(&attr, &old); 34 posix_spawnattr_setsigdefault(&attr, &reset); 35 posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETSIGDEF|POSIX_SPAWN_SETSIGMASK); 36 ret = posix_spawn(&pid, "/bin/sh", 0, &attr, 37 (char *[]){"sh", "-c", (char *)cmd, 0}, __environ); 38 posix_spawnattr_destroy(&attr); 39 40 if (!ret) while (waitpid(pid, &status, 0)<0 && errno == EINTR); 41 sigaction(SIGINT, &oldint, NULL); 42 sigaction(SIGQUIT, &oldquit, NULL); 43 sigprocmask(SIG_SETMASK, &old, NULL); 44 45 if (ret) errno = ret; 46 return status; 47} 48