1 /* 2 * Copyright (c) 2023 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef _SIGCHAIN_H 17 #define _SIGCHAIN_H 18 19 #ifndef _GNU_SOURCE 20 #define _GNU_SOURCE 21 #endif 22 #include <signal.h> 23 #include <stdint.h> 24 #include <stdbool.h> 25 26 #ifdef __cplusplus 27 extern "C" { 28 #endif 29 30 static const int SIGCHAIN_ALLOW_NORETURN = 0x1UL; 31 32 /* The action of the sigchain. */ 33 struct signal_chain_action { 34 bool (*sca_sigaction)(int, siginfo_t*, void*); 35 sigset_t sca_mask; 36 int sca_flags; 37 }; 38 39 /* Mark the signal to the sigchain, add the special handler to the sigchain. */ 40 void add_special_signal_handler(int signo, struct signal_chain_action* sa); 41 /* Add the special handler at the last of sigchain chains */ 42 void add_special_handler_at_last(int signo, struct signal_chain_action* sa); 43 /* Remove the special the handler from the sigchain. */ 44 void remove_special_signal_handler(int signo, bool (*fn)(int, siginfo_t*, void*)); 45 /* Remove all special the handler from the sigchain */ 46 void remove_all_special_handler(int signo); 47 48 #ifdef __cplusplus 49 } 50 #endif 51 52 #endif