/* Check if posix_spawn does not act as a cancellation entrypoint. Copyright (C) 2016-2024 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ #include <errno.h> #include <paths.h> #include <pthread.h> #include <signal.h> #include <spawn.h> #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/wait.h> static int do_test (void); #define TEST_FUNCTION do_test () #include <test-skeleton.c> static pthread_barrier_t b; static pid_t pid; static int pipefd[2]; static void * tf (void *arg) { xpthread_barrier_wait (&b); posix_spawn_file_actions_t a; if (posix_spawn_file_actions_init (&a) != 0) { puts ("error: spawn_file_actions_init failed"); exit (1); } if (posix_spawn_file_actions_adddup2 (&a, pipefd[1], STDOUT_FILENO) != 0) { puts ("error: spawn_file_actions_adddup2 failed"); exit (1); } if (posix_spawn_file_actions_addclose (&a, pipefd[0]) != 0) { puts ("error: spawn_file_actions_addclose"); exit (1); } char *argv[] = { (char *) _PATH_BSHELL, (char *) "-c", (char *) "echo $$", NULL }; if (posix_spawn (&pid, _PATH_BSHELL, &a, NULL, argv, NULL) != 0) { puts ("error: spawn failed"); exit (1); } return NULL; } static int do_test (void) { /* The test basically pipe a 'echo $$' created by a thread with a cancellation pending. It then checks if the thread is not cancelled, the process is created and if the output is the expected one. */ if (pipe (pipefd) != 0) { puts ("error: pipe failed"); exit (1); } /* Not interested in knowing when the pipe is closed. */ xsignal (SIGPIPE, SIG_IGN); /* To synchronize with the thread. */ if (pthread_barrier_init (&b, NULL, 2) != 0) { puts ("error: pthread_barrier_init failed"); exit (1); } pthread_t th = xpthread_create (NULL, &tf, NULL); if (pthread_cancel (th) != 0) { puts ("error: pthread_cancel failed"); return 1; } xpthread_barrier_wait (&b); if (xpthread_join (th) == PTHREAD_CANCELED) { puts ("error: thread cancelled"); exit (1); } close (pipefd[1]); /* The global 'pid' should be set by thread posix_spawn calling. Check below if it was executed correctly and with expected output. */ char buf[64]; ssize_t n; bool seen_pid = false; while (TEMP_FAILURE_RETRY ((n = read (pipefd[0], buf, sizeof (buf)))) > 0) { /* We only expect to read the PID. */ char *endp; long int rpid = strtol (buf, &endp, 10); if (*endp != '\n') { printf ("error: didn't parse whole line: \"%s\"\n", buf); exit (1); } if (endp == buf) { puts ("error: read empty line"); exit (1); } if (rpid != pid) { printf ("error: found \"%s\", expected PID %ld\n", buf, (long int) pid); exit (1); } if (seen_pid) { puts ("error: found more than one PID line"); exit (1); } seen_pid = true; } close (pipefd[0]); int status; int err = waitpid (pid, &status, 0); if (err != pid) { puts ("errnor: waitpid failed"); exit (1); } if (!seen_pid) { puts ("error: didn't get PID"); exit (1); } return 0; }