| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #pragma once |
| |
| #include <signal.h> |
| |
| #include "platform/bionic/macros.h" |
| |
| // This code needs to really block all the signals, not just the user-visible |
| // ones. We call __rt_sigprocmask(2) directly so we don't mask out our own |
| // signals (https://issuetracker.google.com/153624226 was a pthread_exit(3) |
| // crash because a request to dump the thread's stack came in as it was exiting). |
| extern "C" int __rt_sigprocmask(int, const sigset64_t*, sigset64_t*, size_t); |
| |
| class ScopedSignalBlocker { |
| public: |
| // Block all signals. |
| explicit ScopedSignalBlocker() { |
| sigset64_t set; |
| sigfillset64(&set); |
| __rt_sigprocmask(SIG_BLOCK, &set, &old_set_, sizeof(sigset64_t)); |
| } |
| |
| // Block just the specified signal. |
| explicit ScopedSignalBlocker(int signal) { |
| sigset64_t set = {}; |
| sigaddset64(&set, signal); |
| __rt_sigprocmask(SIG_BLOCK, &set, &old_set_, sizeof(sigset64_t)); |
| } |
| |
| ~ScopedSignalBlocker() { |
| reset(); |
| } |
| |
| void reset() { |
| __rt_sigprocmask(SIG_SETMASK, &old_set_, nullptr, sizeof(sigset64_t)); |
| } |
| |
| sigset64_t old_set_; |
| |
| BIONIC_DISALLOW_COPY_AND_ASSIGN(ScopedSignalBlocker); |
| }; |