| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| |
| #include "kudu/util/signal.h" |
| |
| #include <cerrno> |
| |
| #include <glog/logging.h> // IWYU pragma: keep |
| #include <glog/raw_logging.h> |
| |
| namespace kudu { |
| |
| // Using RAW_LOG() and logging directly into stderr instead of using more |
| // advanced LOG() to keep all these function as async-signal-safe as possible. |
| // |
| // NOTE: RAW_LOG() uses vsnprintf(), and it's not async-signal-safe |
| // strictly speaking (in some cases may call malloc(), etc.) |
| |
| void SetSignalHandler(int signal, SignalHandlerCallback handler) { |
| struct sigaction act; |
| act.sa_handler = handler; |
| sigemptyset(&act.sa_mask); |
| act.sa_flags = 0; |
| if (sigaction(signal, &act, nullptr) != 0) { |
| int err = errno; |
| RAW_LOG(FATAL, "sigaction() failed: [%d]", err); |
| } |
| } |
| |
| void IgnoreSigPipe() { |
| SetSignalHandler(SIGPIPE, SIG_IGN); |
| } |
| |
| void ResetSigPipeHandlerToDefault() { |
| SetSignalHandler(SIGPIPE, SIG_DFL); |
| } |
| |
| // We unblock all signal masks since they are inherited. |
| void ResetAllSignalMasksToUnblocked() { |
| sigset_t sigset; |
| if (sigfillset(&sigset) != 0) { |
| int err = errno; |
| RAW_LOG(FATAL, "sigfillset() failed: [%d]", err); |
| } |
| if (sigprocmask(SIG_UNBLOCK, &sigset, nullptr) != 0) { |
| int err = errno; |
| RAW_LOG(FATAL, "sigprocmask() failed: [%d]", err); |
| } |
| } |
| |
| } // namespace kudu |