gdb/testsuite/gdb.threads/vfork-follow-child-exec.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2019-2021 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 #include <stdio.h>
  19 #include <unistd.h>
  20 #include <pthread.h>
  21 #include <string.h>
  22 #include <stdlib.h>
  23
  24 static char *program_name;
  25
  26 static void *
  27 f (void *arg)
  28 {
  29   int res = vfork ();
  30
  31   if (res == -1)
  32     {
  33       perror ("vfork");
  34       return NULL;
  35     }
  36   else if (res == 0)
  37     {
  38       /* Child.  */
  39       execl (program_name, program_name, "1", NULL);
  40       perror ("exec");
  41       abort ();
  42     }
  43   else
  44     {
  45       /* Parent.  */
  46       return NULL;
  47     }
  48 }
  49
  50 int
  51 main (int argc, char **argv)
  52 {
  53   pthread_t tid;
  54
  55   if (argc > 1)
  56     {
  57       /* Getting here via execl.  */
  58       return 0;
  59     }
  60
  61   program_name = argv[0];
  62
  63   pthread_create (&tid, NULL, f, NULL);
  64   pthread_join (tid, NULL);
  65   return 0;
  66 }