- sigprocmask(SIG_BLOCK, SIGALL_SET, &old);
-
- __acquire_ptc();
- pid = __vfork();
- __release_ptc();
-
- if (pid > 0) {
- sigset_t new = old;
- sigaddset(&new, SIGCHLD);
- sigprocmask(SIG_BLOCK, &new, 0);
- while (waitpid(pid, &status, 0) && errno == EINTR);
- }
-
- if (pid) {
- sigaction(SIGINT, &oldint, NULL);
- sigaction(SIGQUIT, &oldquit, NULL);
- sigprocmask(SIG_SETMASK, &old, NULL);
- return status;
- }
-
- /* Before we can unblock signals in the child, all signal
- * handlers must be eliminated -- even implementation-internal
- * ones. Otherwise, a signal handler could run in the child
- * and clobber the parent's memory (due to vfork). */
- for (i=1; i<=8*__SYSCALL_SSLEN; i++) {
- struct sigaction sa;
- __libc_sigaction(i, 0, &sa);
- if (sa.sa_handler!=SIG_IGN && sa.sa_handler!=SIG_DFL) {
- sa.sa_handler = SIG_DFL;
- __libc_sigaction(i, &sa, 0);
- }
- }
-
+ 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);