1 /* Copyright (C) 2003-2022 Free Software Foundation, Inc.
2    This file is part of the GNU C Library.
3 
4    The GNU C Library is free software; you can redistribute it and/or
5    modify it under the terms of the GNU Lesser General Public
6    License as published by the Free Software Foundation; either
7    version 2.1 of the License, or (at your option) any later version.
8 
9    The GNU C Library is distributed in the hope that it will be useful,
10    but WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12    Lesser General Public License for more details.
13 
14    You should have received a copy of the GNU Lesser General Public
15    License along with the GNU C Library; if not, see
16    <https://www.gnu.org/licenses/>.  */
17 
18 #include <pthread.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <dso_handle.h>
22 
23 
24 extern int val;
25 
26 
27 static void
prepare(void)28 prepare (void)
29 {
30   ++val;
31 }
32 
33 static void
parent(void)34 parent (void)
35 {
36   val *= 4;
37 }
38 
39 static void
child(void)40 child (void)
41 {
42   val *= 8;
43 }
44 
45 static void
46 __attribute__ ((constructor))
init(void)47 init (void)
48 {
49   printf ("dsohandle = %p\n", __dso_handle);
50 
51   if (pthread_atfork (prepare, parent, child) != 0)
52     {
53       puts ("init: atfork failed");
54       exit (1);
55     }
56 }
57