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