nptl/tst-exec1.c

   1 /* Simple exec test, only a thread in the parent.
   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   posix_spawn_file_actions_t a;
  63   if (posix_spawn_file_actions_init (&a) != 0)
  64     {
  65       puts ("spawn_file_actions_init failed");
  66       exit (1);
  67     }
  68
  69   if (posix_spawn_file_actions_adddup2 (&a, fd[1], STDOUT_FILENO) != 0)
  70     {
  71       puts ("spawn_file_actions_adddup2 failed");
  72       exit (1);
  73     }
  74
  75   if (posix_spawn_file_actions_addclose (&a, fd[0]) != 0)
  76     {
  77       puts ("spawn_file_actions_addclose");
  78       exit (1);
  79     }
  80
  81   pthread_t th;
  82   if (pthread_create (&th, NULL, tf, (void *) pthread_self ()) != 0)
  83     {
  84       puts ("create failed");
  85       exit (1);
  86     }
  87
  88   pid_t pid;
  89   char *argv[] = { (char *) _PATH_BSHELL, (char *) "-c", (char *) "echo $$",
  90                    NULL };
  91   if (posix_spawn (&pid, _PATH_BSHELL, &a, NULL, argv, NULL) != 0)
  92     {
  93       puts ("spawn failed");
  94       exit (1);
  95     }
  96
  97   close (fd[1]);
  98
  99   char buf[200];
 100   ssize_t n;
 101   bool seen_pid = false;
 102   while (TEMP_FAILURE_RETRY ((n = read (fd[0], buf, sizeof (buf)))) > 0)
 103     {
 104       /* We only expect to read the PID.  */
 105       char *endp;
 106       long int rpid = strtol (buf, &endp, 10);
 107
 108       if (*endp != '\n')
 109         {
 110           printf ("didn't parse whole line: \"%s\"\n", buf);
 111           exit (1);
 112         }
 113       if (endp == buf)
 114         {
 115           puts ("read empty line");
 116           exit (1);
 117         }
 118
 119       if (rpid != pid)
 120         {
 121           printf ("found \"%s\", expected PID %ld\n", buf, (long int) pid);
 122           exit (1);
 123         }
 124
 125       if (seen_pid)
 126         {
 127           puts ("found more than one PID line");
 128           exit (1);
 129         }
 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   puts ("read correct PID");
 151
 152   return 0;
 153 }
 154
 155 #define TEST_FUNCTION do_test ()
 156 #include "../test-skeleton.c"