gdb/testsuite/gdb.threads/foll-fork-other-thread.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2022-2024 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 <pthread.h>
  19 #include <unistd.h>
  20 #include <sys/types.h>
  21 #include <sys/wait.h>
  22 #include <errno.h>
  23 #include <assert.h>
  24 #include <limits.h>
  25
  26 /* Set by GDB.  */
  27 volatile int stop_looping = 0;
  28
  29 static void *
  30 gdb_forker_thread (void *arg)
  31 {
  32   int ret;
  33   int stat;
  34   pid_t pid = FORK_FUNC ();
  35
  36   if (pid == 0)
  37     _exit (0);
  38
  39   assert (pid > 0);
  40
  41   /* Wait for child to exit.  */
  42   do
  43     {
  44       ret = waitpid (pid, &stat, 0);
  45     }
  46   while (ret == -1 && errno == EINTR);
  47
  48   assert (ret == pid);
  49   assert (WIFEXITED (stat));
  50   assert (WEXITSTATUS (stat) == 0);
  51
  52   stop_looping = 1;
  53
  54   return NULL;
  55 }
  56
  57 static void
  58 sleep_a_bit (void)
  59 {
  60   usleep (1000 * 50);
  61 }
  62
  63 int
  64 main (void)
  65 {
  66   int i;
  67   int ret;
  68   pthread_t thread;
  69
  70   alarm (60);
  71
  72   ret = pthread_create (&thread, NULL, gdb_forker_thread, NULL);
  73   assert (ret == 0);
  74
  75   while (!stop_looping)  /* while loop */
  76     {
  77       sleep_a_bit ();    /* break here */
  78       sleep_a_bit ();    /* other line */
  79     }
  80
  81   pthread_join (thread, NULL);
  82
  83   return 0; /* exiting here */
  84 }