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#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; } |