Back to index

glibc  2.9
fork.h
Go to the documentation of this file.
00001 /* Copyright (C) 2002, 2003, 2006, 2007 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <lowlevellock.h>
00021 
00022 /* The fork generation counter, defined in libpthread.  */
00023 extern unsigned long int __fork_generation attribute_hidden;
00024 
00025 /* Pointer to the fork generation counter in the thread library.  */
00026 extern unsigned long int *__fork_generation_pointer attribute_hidden;
00027 
00028 /* Lock to protect allocation and deallocation of fork handlers.  */
00029 extern int __fork_lock attribute_hidden;
00030 
00031 /* Elements of the fork handler lists.  */
00032 struct fork_handler
00033 {
00034   struct fork_handler *next;
00035   void (*prepare_handler) (void);
00036   void (*parent_handler) (void);
00037   void (*child_handler) (void);
00038   void *dso_handle;
00039   unsigned int refcntr;
00040   int need_signal;
00041 };
00042 
00043 /* The single linked list of all currently registered for handlers.  */
00044 extern struct fork_handler *__fork_handlers attribute_hidden;
00045 
00046 
00047 /* Function to call to unregister fork handlers.  */
00048 extern void __unregister_atfork (void *dso_handle) attribute_hidden;
00049 #define UNREGISTER_ATFORK(dso_handle) __unregister_atfork (dso_handle)
00050 
00051 
00052 /* C library side function to register new fork handlers.  */
00053 extern int __register_atfork (void (*__prepare) (void),
00054                            void (*__parent) (void),
00055                            void (*__child) (void),
00056                            void *dso_handle);
00057 libc_hidden_proto (__register_atfork)
00058 
00059 /* Add a new element to the fork list.  */
00060 extern void __linkin_atfork (struct fork_handler *newp) attribute_hidden;