| // 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. |
| |
| #ifndef __POSIX_SIGNALHANDLER_HPP__ |
| #define __POSIX_SIGNALHANDLER_HPP__ |
| |
| #include <signal.h> |
| |
| #include <functional> |
| #include <mutex> |
| |
| #include <stout/synchronized.hpp> |
| |
| namespace os { |
| namespace internal { |
| |
| // Not using extern as this is used only by the executable. The signal |
| // handler should be configured once. Configuring it multiple times will |
| // overwrite any previous handlers. |
| std::function<void(int, int)>* signaledWrapper = nullptr; |
| |
| void signalHandler(int sig, siginfo_t* siginfo, void* context) |
| { |
| if (signaledWrapper != nullptr) { |
| (*signaledWrapper)(sig, siginfo->si_uid); |
| } |
| } |
| |
| |
| int configureSignal(const std::function<void(int, int)>* signal) |
| { |
| // NOTE: We only expect this function to be called multiple |
| // times inside tests and `mesos-local`. |
| |
| static std::mutex mutex; |
| |
| synchronized (mutex) { |
| if (signaledWrapper != nullptr) { |
| delete signaledWrapper; |
| } |
| |
| struct sigaction action; |
| memset(&action, 0, sizeof(struct sigaction)); |
| |
| signaledWrapper = new std::function<void(int, int)>(*signal); |
| |
| // Do not block additional signals while in the handler. |
| sigemptyset(&action.sa_mask); |
| |
| // The SA_SIGINFO flag tells `sigaction()` to use |
| // the sa_sigaction field, not sa_handler. |
| action.sa_flags = SA_SIGINFO; |
| |
| action.sa_sigaction = signalHandler; |
| |
| return sigaction(SIGUSR1, &action, nullptr); |
| } |
| } |
| |
| } // namespace internal { |
| |
| } // namespace os { |
| |
| #endif // __POSIX_SIGNALHANDLER_HPP__ |