nptl/tst-exec3.c

   1 /* Thread calls exec.
   2    Copyright (C) 2002-2020 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    <https://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   execl (_PATH_BSHELL, _PATH_BSHELL, "-c", "echo $$", NULL);
  36
  37   puts ("execl failed");
  38   exit (1);
  39 }
  40
  41
  42 static int
  43 do_test (void)
  44 {
  45   int fd[2];
  46   if (pipe (fd) != 0)
  47     {
  48       puts ("pipe failed");
  49       exit (1);
  50     }
  51
  52   /* Not interested in knowing when the pipe is closed.  */
  53   if (sigignore (SIGPIPE) != 0)
  54     {
  55       puts ("sigignore failed");
  56       exit (1);
  57     }
  58
  59   pid_t pid = fork ();
  60   if (pid == -1)
  61     {
  62       puts ("fork failed");
  63       exit (1);
  64     }
  65
  66   if (pid == 0)
  67     {
  68       /* Use the fd for stdout.  This is kind of ugly because it
  69          substitutes the fd of stdout but we know what we are doing
  70          here...  */
  71       if (dup2 (fd[1], STDOUT_FILENO) != STDOUT_FILENO)
  72         {
  73           puts ("dup2 failed");
  74           exit (1);
  75         }
  76
  77       close (fd[0]);
  78
  79       pthread_t th;
  80       if (pthread_create (&th, NULL, tf, NULL) != 0)
  81         {
  82           puts ("create failed");
  83           exit (1);
  84         }
  85
  86       if (pthread_join (th, NULL) == 0)
  87         {
  88           puts ("join succeeded!?");
  89           exit (1);
  90         }
  91
  92       puts ("join returned!?");
  93       exit (1);
  94     }
  95
  96   close (fd[1]);
  97
  98   char buf[200];
  99   ssize_t n;
 100   bool seen_pid = false;
 101   while (TEMP_FAILURE_RETRY ((n = read (fd[0], buf, sizeof (buf)))) > 0)
 102     {
 103       /* We only expect to read the PID.  */
 104       char *endp;
 105       long int rpid = strtol (buf, &endp, 10);
 106
 107       if (*endp != '\n')
 108         {
 109           printf ("didn't parse whole line: \"%s\"\n", buf);
 110           exit (1);
 111         }
 112       if (endp == buf)
 113         {
 114           puts ("read empty line");
 115           exit (1);
 116         }
 117
 118       if (rpid != pid)
 119         {
 120           printf ("found \"%s\", expected PID %ld\n", buf, (long int) pid);
 121           exit (1);
 122         }
 123
 124       if (seen_pid)
 125         {
 126           puts ("found more than one PID line");
 127           exit (1);
 128         }
 129       seen_pid = true;
 130     }
 131
 132   close (fd[0]);
 133
 134   int status;
 135   int err = waitpid (pid, &status, 0);
 136   if (err != pid)
 137     {
 138       puts ("waitpid failed");
 139       exit (1);
 140     }
 141
 142   if (!seen_pid)
 143     {
 144       puts ("didn't get PID");
 145       exit (1);
 146     }
 147
 148   return 0;
 149 }
 150
 151 #define TEST_FUNCTION do_test ()
 152 #include "../test-skeleton.c"