nptl/tst-exec2.c

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