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// 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.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 = new Signal("USR2");
OomSignalHandler() {
super(SIGUSR2);
}
@Override
protected void onSignal() {
String message = "SIGUSR2 received, presumably from JVM due to OOM";
LOG.info(message);
OutErr.SYSTEM_OUT_ERR.printErrLn(
"Exiting as if we OOM'd because SIGUSR2 received, presumably from JVM");
BugReport.handleCrash(new OutOfMemoryError(message));
}
}
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