Blame nptl/tst-exec1.c

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/* Simple exec test, only a thread in the parent.
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   Copyright (C) 2002-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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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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   <http://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 void *
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tf (void *arg)
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{
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  pthread_t th = (pthread_t) arg;
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  if (pthread_join (th, NULL) == 0)
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    {
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      puts ("thread in parent joined!?");
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      exit (1);
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    }
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  puts ("join in thread in parent returned!?");
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  exit (1);
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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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  int fd[2];
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  if (pipe (fd) != 0)
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    {
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      puts ("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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  if (sigignore (SIGPIPE) != 0)
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    {
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      puts ("sigignore failed");
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      exit (1);
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    }
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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 ("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, fd[1], STDOUT_FILENO) != 0)
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    {
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      puts ("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, fd[0]) != 0)
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    {
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      puts ("spawn_file_actions_addclose");
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      exit (1);
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    }
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  pthread_t th;
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  if (pthread_create (&th, NULL, tf, (void *) pthread_self ()) != 0)
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    {
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      puts ("create failed");
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      exit (1);
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    }
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  pid_t pid;
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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 ("spawn failed");
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      exit (1);
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    }
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  close (fd[1]);
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  char buf[200];
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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 (fd[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 ("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 ("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 ("found \"%s\", expected PID %ld\n", buf, (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 ("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 (fd[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 ("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 ("didn't get PID");
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      exit (1);
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    }
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  puts ("read correct PID");
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  return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"