gdb/testsuite/gdb.threads/clone-thread_db.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2015-2021 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    Test that GDB doesn't lose an event for a thread it didn't know
  19    about, until an event is reported for it.  */
  20
  21 #define _GNU_SOURCE
  22 #include <sched.h>
  23 #include <assert.h>
  24 #include <stdlib.h>
  25 #include <sys/types.h>
  26 #include <sys/wait.h>
  27 #include <unistd.h>
  28 #include <pthread.h>
  29
  30 #define STACK_SIZE 0x1000
  31
  32 int clone_pid;
  33
  34 static int
  35 clone_fn (void *unused)
  36 {
  37   return 0;
  38 }
  39
  40 void *
  41 thread_fn (void *arg)
  42 {
  43   unsigned char *stack;
  44   int res;
  45
  46   stack = malloc (STACK_SIZE);
  47   assert (stack != NULL);
  48
  49 #ifdef __ia64__
  50   clone_pid = __clone2 (clone_fn, stack, STACK_SIZE, CLONE_VM, NULL);
  51 #else
  52   clone_pid = clone (clone_fn, stack + STACK_SIZE, CLONE_VM, NULL);
  53 #endif
  54
  55   assert (clone_pid > 0);
  56
  57   /* Wait for child.  */
  58   res = waitpid (clone_pid, NULL, __WCLONE);
  59   assert (res != -1);
  60
  61   return NULL;
  62 }
  63
  64 int
  65 main (int argc, char **argv)
  66 {
  67   pthread_t child;
  68
  69   alarm (300);
  70
  71   pthread_create (&child, NULL, thread_fn, NULL);
  72   pthread_join (child, NULL);
  73
  74   return 0;
  75 }