gdb/testsuite/gdb.threads/check-libthread-db.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2017-2020 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <sys/types.h>
  22 #include <unistd.h>
  23 #include <pthread.h>
  24 #include <errno.h>
  25
  26 /* This barrier ensures we only reach the initial breakpoint after both threads
  27    have set errno.  */
  28 pthread_barrier_t start_threads_barrier;
  29
  30 static void
  31 break_here (void)
  32 {
  33 }
  34
  35 static void *
  36 thread_routine (void *arg)
  37 {
  38   errno = 42;
  39   pthread_barrier_wait (&start_threads_barrier);
  40
  41   break_here ();
  42
  43   while (1)
  44     sleep (1);
  45
  46   return NULL;
  47 }
  48
  49 int
  50 main (int argc, char *argv)
  51 {
  52   pthread_t the_thread;
  53   int err;
  54
  55   pthread_barrier_init (&start_threads_barrier, NULL, 2);
  56
  57   err = pthread_create (&the_thread, NULL, thread_routine, NULL);
  58   if (err != 0)
  59     {
  60       fprintf (stderr, "pthread_create: %s (%d)\n", strerror (err), err);
  61       exit (EXIT_FAILURE);
  62     }
  63
  64   errno = 23;
  65   pthread_barrier_wait (&start_threads_barrier);
  66
  67   err = pthread_join (the_thread, NULL);
  68   if (err != 0)
  69     {
  70       fprintf (stderr, "pthread_join: %s (%d)\n", strerror (err), err);
  71       exit (EXIT_FAILURE);
  72     }
  73
  74   exit (EXIT_SUCCESS);
  75 }