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/* Thread calls exec.
Copyright (C) 2002-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 void *
tf (void *arg)
{
execl (_PATH_BSHELL, _PATH_BSHELL, "-c", "echo $$", NULL);
puts ("execl failed");
exit (1);
}
static int
do_test (void)
{
int fd[2];
if (pipe (fd) != 0)
{
puts ("pipe failed");
exit (1);
}
/* Not interested in knowing when the pipe is closed. */
if (sigignore (SIGPIPE) != 0)
{
puts ("sigignore failed");
exit (1);
}
pid_t pid = fork ();
if (pid == -1)
{
puts ("fork failed");
exit (1);
}
if (pid == 0)
{
/* Use the fd for stdout. This is kind of ugly because it
substitutes the fd of stdout but we know what we are doing
here... */
if (dup2 (fd[1], STDOUT_FILENO) != STDOUT_FILENO)
{
puts ("dup2 failed");
exit (1);
}
close (fd[0]);
pthread_t th;
if (pthread_create (&th, NULL, tf, NULL) != 0)
{
puts ("create failed");
exit (1);
}
if (pthread_join (th, NULL) == 0)
{
puts ("join succeeded!?");
exit (1);
}
puts ("join returned!?");
exit (1);
}
close (fd[1]);
char buf[200];
ssize_t n;
bool seen_pid = false;
while (TEMP_FAILURE_RETRY ((n = read (fd[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 ("didn't parse whole line: \"%s\"\n", buf);
exit (1);
}
if (endp == buf)
{
puts ("read empty line");
exit (1);
}
if (rpid != pid)
{
printf ("found \"%s\", expected PID %ld\n", buf, (long int) pid);
exit (1);
}
if (seen_pid)
{
puts ("found more than one PID line");
exit (1);
}
seen_pid = true;
}
close (fd[0]);
int status;
int err = waitpid (pid, &status, 0);
if (err != pid)
{
puts ("waitpid failed");
exit (1);
}
if (!seen_pid)
{
puts ("didn't get PID");
exit (1);
}
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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