/* Thread calls exec.

   Copyright (C) 2002-2018 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

   <http://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"