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glibc  2.9
tst-atfork2mod.c
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00001 /* Copyright (C) 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <pthread.h>
00021 #include <stdio.h>
00022 #include <stdlib.h>
00023 
00024 
00025 extern int val;
00026 
00027 
00028 static void
00029 prepare (void)
00030 {
00031   ++val;
00032 }
00033 
00034 static void
00035 parent (void)
00036 {
00037   val *= 4;
00038 }
00039 
00040 static void
00041 child (void)
00042 {
00043   val *= 8;
00044 }
00045 
00046 static void
00047 __attribute__ ((constructor))
00048 init (void)
00049 {
00050   extern void *__dso_handle;
00051   printf ("dsohandle = %p\n", __dso_handle);
00052 
00053   if (pthread_atfork (prepare, parent, child) != 0)
00054     {
00055       puts ("init: atfork failed");
00056       exit (1);
00057     }
00058 }