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