nptl/tst-exec3.c

   1 /* Thread calls exec.
   2    Copyright (C) 2002 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <errno.h>
  22 #include <paths.h>
  23 #include <pthread.h>
  24 #include <signal.h>
  25 #include <spawn.h>
  26 #include <stdbool.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <sys/wait.h>
  31
  32
  33 static void *
  34 tf (void *arg)
  35 {
  36   execl (_PATH_BSHELL, _PATH_BSHELL, "-c", "echo $$", NULL);
  37
  38   puts ("execl failed");
  39   exit (1);
  40 }
  41
  42
  43 static int
  44 do_test (void)
  45 {
  46   int fd[2];
  47   if (pipe (fd) != 0)
  48     {
  49       puts ("pipe failed");
  50       exit (1);
  51     }
  52
  53   /* Not interested in knowing when the pipe is closed.  */
  54   if (sigignore (SIGPIPE) != 0)
  55     {
  56       puts ("sigignore failed");
  57       exit (1);
  58     }
  59
  60   pid_t pid = fork ();
  61   if (pid == -1)
  62     {
  63       puts ("fork failed");
  64       exit (1);
  65     }
  66
  67   if (pid == 0)
  68     {
  69       /* Use the fd for stdout.  This is kind of ugly because it
  70          substitutes the fd of stdout but we know what we are doing
  71          here...  */
  72       if (dup2 (fd[1], STDOUT_FILENO) != STDOUT_FILENO)
  73         {
  74           puts ("dup2 failed");
  75           exit (1);
  76         }
  77
  78       close (fd[0]);
  79
  80       pthread_t th;
  81       if (pthread_create (&th, NULL, tf, NULL) != 0)
  82         {
  83           puts ("create failed");
  84           exit (1);
  85         }
  86
  87       if (pthread_join (th, NULL) == 0)
  88         {
  89           puts ("join succeeded!?");
  90           exit (1);
  91         }
  92
  93       puts ("join returned!?");
  94       exit (1);
  95     }
  96
  97   close (fd[1]);
  98
  99   char buf[200];
 100   ssize_t n;
 101   bool seen_pid = false;
 102   while (TEMP_FAILURE_RETRY ((n = read (fd[0], buf, sizeof (buf)))) > 0)
 103     {
 104       /* We only expect to read the PID.  */
 105       char *endp;
 106       long int rpid = strtol (buf, &endp, 10);
 107
 108       if (*endp != '\n')
 109         {
 110           printf ("didn't parse whole line: \"%s\"\n", buf);
 111           exit (1);
 112         }
 113       if (endp == buf)
 114         {
 115           puts ("read empty line");
 116           exit (1);
 117         }
 118
 119       if (rpid != pid)
 120         {
 121           printf ("found \"%s\", expected PID %ld\n", buf, (long int) pid);
 122           exit (1);
 123         }
 124
 125       if (seen_pid)
 126         {
 127           puts ("found more than one PID line");
 128           exit (1);
 129         }
 130       seen_pid = true;
 131     }
 132
 133   close (fd[0]);
 134
 135   int status;
 136   int err = waitpid (pid, &status, 0);
 137   if (err != pid)
 138     {
 139       puts ("waitpid failed");
 140       exit (1);
 141     }
 142
 143   if (!seen_pid)
 144     {
 145       puts ("didn't get PID");
 146       exit (1);
 147     }
 148
 149   return 0;
 150 }
 151
 152 #define TEST_FUNCTION do_test ()
 153 #include "../test-skeleton.c"