sysdeps/pthread/tst-exec3.c

   1 /* Thread calls exec.
   2    Copyright (C) 2002-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <paths.h>
  21 #include <pthread.h>
  22 #include <signal.h>
  23 #include <spawn.h>
  24 #include <stdbool.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <sys/wait.h>
  29 #include <support/xsignal.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   xsignal (SIGPIPE, SIG_IGN);
  54
  55   pid_t pid = fork ();
  56   if (pid == -1)
  57     {
  58       puts ("fork failed");
  59       exit (1);
  60     }
  61
  62   if (pid == 0)
  63     {
  64       /* Use the fd for stdout.  This is kind of ugly because it
  65          substitutes the fd of stdout but we know what we are doing
  66          here...  */
  67       if (dup2 (fd[1], STDOUT_FILENO) != STDOUT_FILENO)
  68         {
  69           puts ("dup2 failed");
  70           exit (1);
  71         }
  72
  73       close (fd[0]);
  74
  75       pthread_t th;
  76       if (pthread_create (&th, NULL, tf, NULL) != 0)
  77         {
  78           puts ("create failed");
  79           exit (1);
  80         }
  81
  82       if (pthread_join (th, NULL) == 0)
  83         {
  84           puts ("join succeeded!?");
  85           exit (1);
  86         }
  87
  88       puts ("join returned!?");
  89       exit (1);
  90     }
  91
  92   close (fd[1]);
  93
  94   char buf[200];
  95   ssize_t n;
  96   bool seen_pid = false;
  97   while (TEMP_FAILURE_RETRY ((n = read (fd[0], buf, sizeof (buf)))) > 0)
  98     {
  99       /* We only expect to read the PID.  */
 100       char *endp;
 101       long int rpid = strtol (buf, &endp, 10);
 102
 103       if (*endp != '\n')
 104         {
 105           printf ("didn't parse whole line: \"%s\"\n", buf);
 106           exit (1);
 107         }
 108       if (endp == buf)
 109         {
 110           puts ("read empty line");
 111           exit (1);
 112         }
 113
 114       if (rpid != pid)
 115         {
 116           printf ("found \"%s\", expected PID %ld\n", buf, (long int) pid);
 117           exit (1);
 118         }
 119
 120       if (seen_pid)
 121         {
 122           puts ("found more than one PID line");
 123           exit (1);
 124         }
 125       seen_pid = true;
 126     }
 127
 128   close (fd[0]);
 129
 130   int status;
 131   int err = waitpid (pid, &status, 0);
 132   if (err != pid)
 133     {
 134       puts ("waitpid failed");
 135       exit (1);
 136     }
 137
 138   if (!seen_pid)
 139     {
 140       puts ("didn't get PID");
 141       exit (1);
 142     }
 143
 144   return 0;
 145 }
 146
 147 #define TEST_FUNCTION do_test ()
 148 #include "../test-skeleton.c"