1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ART_SIGCHAINLIB_SIGCHAIN_H_
18 #define ART_SIGCHAINLIB_SIGCHAIN_H_
19 
20 #include <signal.h>
21 #include <stdint.h>
22 
23 namespace art {
24 
25 // Handlers that exit without returning to their caller (e.g. via siglongjmp) must pass this flag.
26 static constexpr uint64_t SIGCHAIN_ALLOW_NORETURN = 0x1UL;
27 
28 struct SigchainAction {
29   bool (*sc_sigaction)(int, siginfo_t*, void*);
30   sigset_t sc_mask;
31   uint64_t sc_flags;
32 };
33 
34 extern "C" void AddSpecialSignalHandlerFn(int signal, SigchainAction* sa);
35 extern "C" void RemoveSpecialSignalHandlerFn(int signal, bool (*fn)(int, siginfo_t*, void*));
36 
37 extern "C" void EnsureFrontOfChain(int signal);
38 extern "C" void SkipAddSignalHandler(bool value);
39 
40 }  // namespace art
41 
42 #endif  // ART_SIGCHAINLIB_SIGCHAIN_H_
43