sysdeps/pthread/tst-exec2.c

   1 /* Thread with running thread calls exec.
   2    Copyright (C) 2002-2024 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   pthread_t th = (pthread_t) arg;
  36
  37   if (pthread_join (th, NULL) == 0)
  38     {
  39       puts ("thread in parent joined!?");
  40       exit (1);
  41     }
  42
  43   puts ("join in thread in parent returned!?");
  44   exit (1);
  45 }
  46
  47
  48 static int
  49 do_test (void)
  50 {
  51   int fd[2];
  52   if (pipe (fd) != 0)
  53     {
  54       puts ("pipe failed");
  55       exit (1);
  56     }
  57
  58   /* Not interested in knowing when the pipe is closed.  */
  59   xsignal (SIGPIPE, SIG_IGN);
  60
  61   pid_t pid = fork ();
  62   if (pid == -1)
  63     {
  64       puts ("fork failed");
  65       exit (1);
  66     }
  67
  68   if (pid == 0)
  69     {
  70       /* Use the fd for stdout.  This is kind of ugly because it
  71          substitutes the fd of stdout but we know what we are doing
  72          here...  */
  73       if (dup2 (fd[1], STDOUT_FILENO) != STDOUT_FILENO)
  74         {
  75           puts ("dup2 failed");
  76           exit (1);
  77         }
  78
  79       close (fd[0]);
  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       execl (_PATH_BSHELL, _PATH_BSHELL, "-c", "echo $$", NULL);
  89
  90       puts ("execl failed");
  91       exit (1);
  92     }
  93
  94   close (fd[1]);
  95
  96   char buf[200];
  97   ssize_t n;
  98   bool seen_pid = false;
  99   while (TEMP_FAILURE_RETRY ((n = read (fd[0], buf, sizeof (buf)))) > 0)
 100     {
 101       /* We only expect to read the PID.  */
 102       char *endp;
 103       long int rpid = strtol (buf, &endp, 10);
 104
 105       if (*endp != '\n')
 106         {
 107           printf ("didn't parse whole line: \"%s\"\n", buf);
 108           exit (1);
 109         }
 110       if (endp == buf)
 111         {
 112           puts ("read empty line");
 113           exit (1);
 114         }
 115
 116       if (rpid != pid)
 117         {
 118           printf ("found \"%s\", expected PID %ld\n", buf, (long int) pid);
 119           exit (1);
 120         }
 121
 122       if (seen_pid)
 123         {
 124           puts ("found more than one PID line");
 125           exit (1);
 126         }
 127       seen_pid = true;
 128     }
 129
 130   close (fd[0]);
 131
 132   int status;
 133   int err = waitpid (pid, &status, 0);
 134   if (err != pid)
 135     {
 136       puts ("waitpid failed");
 137       exit (1);
 138     }
 139
 140   if (!seen_pid)
 141     {
 142       puts ("didn't get PID");
 143       exit (1);
 144     }
 145
 146   return 0;
 147 }
 148
 149 #define TEST_FUNCTION do_test ()
 150 #include "../test-skeleton.c"