| // Copyright 2016 The Bazel Authors. All rights reserved. |
| // |
| // 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. |
| package com.google.devtools.build.lib.runtime; |
| |
| import com.google.devtools.build.lib.server.signal.AbstractSignalHandler; |
| import com.google.devtools.build.lib.util.ExitCode; |
| import com.google.devtools.build.lib.util.OS; |
| import com.google.devtools.build.lib.util.io.OutErr; |
| |
| import sun.misc.Signal; |
| |
| import java.util.logging.Logger; |
| |
| /** |
| * Class that causes Blaze to exit with {@link ExitCode#OOM_ERROR} when the JVM receives a |
| * {@code SIGUSR2} signal. |
| * |
| * <p>The Blaze client can be configured to send {@code SIGUSR2} on an OOM. |
| */ |
| class OomSignalHandler extends AbstractSignalHandler { |
| private static final Logger LOG = Logger.getLogger(OomSignalHandler.class.getName()); |
| private static final Signal SIGUSR2 = (OS.getCurrent() != OS.WINDOWS) ? new Signal("USR2") : null; |
| private static final String MESSAGE = "SIGUSR2 received, presumably from JVM due to OOM"; |
| // Pre-allocate memory for object that will be used during an OOM, because there may not be spare |
| // memory when we're OOMing. That's kind of the point of an OOM. |
| private static final OutOfMemoryError OUT_OF_MEMORY_ERROR = |
| withNoStack(new OutOfMemoryError(MESSAGE)); |
| |
| private static <T extends Throwable> T withNoStack(T throwable) { |
| throwable.setStackTrace(new StackTraceElement[0]); |
| return throwable; |
| } |
| |
| OomSignalHandler() { |
| super(SIGUSR2); |
| } |
| |
| @Override |
| protected void onSignal() { |
| LOG.info(MESSAGE); |
| OutErr.SYSTEM_OUT_ERR.printErrLn( |
| "Exiting as if we OOM'd because SIGUSR2 received, presumably from JVM"); |
| BugReport.handleCrash(OUT_OF_MEMORY_ERROR); |
| } |
| } |