nptl/tst-exec2.c

   1 /* Thread with running thread calls exec.
   2    Copyright (C) 2002-2017 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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <errno.h>
  21 #include <paths.h>
  22 #include <pthread.h>
  23 #include <signal.h>
  24 #include <spawn.h>
  25 #include <stdbool.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <unistd.h>
  29 #include <sys/wait.h>
  30
  31
  32 static void *
  33 tf (void *arg)
  34 {
  35   pthread_t th = (pthread_t) arg;
  36
  37   if (pthread_join (th, NULL) == 0)
  38     {
  39       puts ("thread in parent joined!?");
  40       exit (1);
  41     }
  42
  43   puts ("join in thread in parent returned!?");
  44   exit (1);
  45 }
  46
  47
  48 static int
  49 do_test (void)
  50 {
  51   int fd[2];
  52   if (pipe (fd) != 0)
  53     {
  54       puts ("pipe failed");
  55       exit (1);
  56     }
  57
  58   /* Not interested in knowing when the pipe is closed.  */
  59   if (sigignore (SIGPIPE) != 0)
  60     {
  61       puts ("sigignore failed");
  62       exit (1);
  63     }
  64
  65   pid_t pid = fork ();
  66   if (pid == -1)
  67     {
  68       puts ("fork failed");
  69       exit (1);
  70     }
  71
  72   if (pid == 0)
  73     {
  74       /* Use the fd for stdout.  This is kind of ugly because it
  75          substitutes the fd of stdout but we know what we are doing
  76          here...  */
  77       if (dup2 (fd[1], STDOUT_FILENO) != STDOUT_FILENO)
  78         {
  79           puts ("dup2 failed");
  80           exit (1);
  81         }
  82
  83       close (fd[0]);
  84
  85       pthread_t th;
  86       if (pthread_create (&th, NULL, tf, (void *) pthread_self ()) != 0)
  87         {
  88           puts ("create failed");
  89           exit (1);
  90         }
  91
  92       execl (_PATH_BSHELL, _PATH_BSHELL, "-c", "echo $$", NULL);
  93
  94       puts ("execl failed");
  95       exit (1);
  96     }
  97
  98   close (fd[1]);
  99
 100   char buf[200];
 101   ssize_t n;
 102   bool seen_pid = false;
 103   while (TEMP_FAILURE_RETRY ((n = read (fd[0], buf, sizeof (buf)))) > 0)
 104     {
 105       /* We only expect to read the PID.  */
 106       char *endp;
 107       long int rpid = strtol (buf, &endp, 10);
 108
 109       if (*endp != '\n')
 110         {
 111           printf ("didn't parse whole line: \"%s\"\n", buf);
 112           exit (1);
 113         }
 114       if (endp == buf)
 115         {
 116           puts ("read empty line");
 117           exit (1);
 118         }
 119
 120       if (rpid != pid)
 121         {
 122           printf ("found \"%s\", expected PID %ld\n", buf, (long int) pid);
 123           exit (1);
 124         }
 125
 126       if (seen_pid)
 127         {
 128           puts ("found more than one PID line");
 129           exit (1);
 130         }
 131       seen_pid = true;
 132     }
 133
 134   close (fd[0]);
 135
 136   int status;
 137   int err = waitpid (pid, &status, 0);
 138   if (err != pid)
 139     {
 140       puts ("waitpid failed");
 141       exit (1);
 142     }
 143
 144   if (!seen_pid)
 145     {
 146       puts ("didn't get PID");
 147       exit (1);
 148     }
 149
 150   return 0;
 151 }
 152
 153 #define TEST_FUNCTION do_test ()
 154 #include "../test-skeleton.c"