1 /* Internal pthread_atfork definitions. 2 Copyright (C) 2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 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, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _REGISTER_ATFORK_H 20 #define _REGISTER_ATFORK_H 21 22 /* Elements of the fork handler lists. */ 23 struct fork_handler 24 { 25 void (*prepare_handler) (void); 26 void (*parent_handler) (void); 27 void (*child_handler) (void); 28 void *dso_handle; 29 }; 30 31 /* Function to call to unregister fork handlers. */ 32 extern void __unregister_atfork (void *dso_handle) attribute_hidden; 33 #define UNREGISTER_ATFORK(dso_handle) __unregister_atfork (dso_handle) 34 35 enum __run_fork_handler_type 36 { 37 atfork_run_prepare, 38 atfork_run_child, 39 atfork_run_parent 40 }; 41 42 /* Run the atfork handlers and lock/unlock the internal lock depending 43 of the WHO argument: 44 45 - atfork_run_prepare: run all the PREPARE_HANDLER in reverse order of 46 insertion and locks the internal lock. 47 - atfork_run_child: run all the CHILD_HANDLER and unlocks the internal 48 lock. 49 - atfork_run_parent: run all the PARENT_HANDLER and unlocks the internal 50 lock. 51 52 Perform locking only if DO_LOCKING. */ 53 extern void __run_fork_handlers (enum __run_fork_handler_type who, 54 _Bool do_locking) attribute_hidden; 55 56 /* C library side function to register new fork handlers. */ 57 extern int __register_atfork (void (*__prepare) (void), 58 void (*__parent) (void), 59 void (*__child) (void), 60 void *dso_handle); 61 libc_hidden_proto (__register_atfork) 62 63 #endif 64