gdb/testsuite/gdb.threads/clone-attach-detach.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2016-2020 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
  19 #define _GNU_SOURCE
  20 #include <sched.h>
  21 #include <assert.h>
  22 #include <stdlib.h>
  23 #include <sys/types.h>
  24 #include <sys/wait.h>
  25 #include <unistd.h>
  26
  27 #define STACK_SIZE 0x1000
  28
  29 int clone_pid;
  30
  31 static int
  32 clone_fn (void *unused)
  33 {
  34   /* Wait for alarm.  */
  35   while (1)
  36     sleep (1);
  37   return 0;
  38 }
  39
  40 int
  41 main (int argc, char **argv)
  42 {
  43   unsigned char *stack;
  44   int res;
  45
  46   alarm (300);
  47
  48   stack = malloc (STACK_SIZE);
  49   assert (stack != NULL);
  50
  51 #define CLONE_FLAGS (CLONE_THREAD | CLONE_SIGHAND | CLONE_VM)
  52
  53 #ifdef __ia64__
  54   clone_pid = __clone2 (clone_fn, stack, STACK_SIZE, CLONE_FLAGS, NULL);
  55 #else
  56   clone_pid = clone (clone_fn, stack + STACK_SIZE, CLONE_FLAGS, NULL);
  57 #endif
  58
  59   assert (clone_pid > 0);
  60
  61   /* Wait for alarm.  */
  62   while (1)
  63     sleep (1);
  64
  65   return 0;
  66 }