gdb/testsuite/gdb.base/vfork-follow-parent.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2021-2023 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 <unistd.h>
  19
  20 static volatile int unblock_parent = 0;
  21
  22 static void
  23 break_parent (void)
  24 {
  25 }
  26
  27 int
  28 main (void)
  29 {
  30   alarm (30);
  31
  32   if (vfork () != 0)
  33     {
  34       /* We want to guarantee that GDB processes the child exit event before
  35          the parent's breakpoint hit event.  Make the parent wait on this
  36          variable that is eventually set by the test.  */
  37       while (!unblock_parent)
  38         usleep (1000);
  39
  40       break_parent ();
  41     }
  42   else
  43     _exit (0);
  44
  45   return 0;
  46 }