nptl/tst-exec2.c

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