linuxthreads/sysdeps/unix/sysv/linux/fork.h

   1 /* Copyright (C) 2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <list.h>
  21 #include <bits/libc-lock.h>
  22 #include <sysdep.h>
  23
  24 struct fork_block
  25 {
  26   /* Lock to protect handling of fork handlers.  */
  27   __libc_lock_define (, lock);
  28
  29   /* Lists of registered fork handlers.  */
  30   list_t prepare_list;
  31   list_t parent_list;
  32   list_t child_list;
  33 };
  34
  35 extern struct fork_block __fork_block attribute_hidden;
  36
  37 /* Elements of the fork handler lists.  */
  38 struct fork_handler
  39 {
  40   list_t list;
  41   void (*handler) (void);
  42   void *dso_handle;
  43 };
  44
  45
  46 /* Function to call to unregister fork handlers.  */
  47 extern void __unregister_atfork (void *dso_handle) attribute_hidden;
  48 #define UNREGISTER_ATFORK(dso_handle) __unregister_atfork (dso_handle)
  49
  50
  51 /* C library side function to register new fork handlers.  */
  52 extern int __register_atfork (void (*__prepare) (void),
  53                               void (*__parent) (void),
  54                               void (*__child) (void),
  55                               void *dso_handle);
  56 libc_hidden_proto (__register_atfork)
  57
  58 #ifndef ARCH_FORK
  59 # define ARCH_FORK() INLINE_SYSCALL (fork, 0)
  60 #endif