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// Copyright 2017 Google Inc. 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 build
import (
"os"
"os/signal"
"runtime/debug"
"syscall"
"android/soong/ui/logger"
)
// SetupSignals sets up signal handling to kill our children and allow us to cleanly finish
// writing our log/trace files.
//
// Currently, on the first SIGINT|SIGALARM we call the cancel() function, which is usually
// the CancelFunc returned by context.WithCancel, which will kill all the commands running
// within that Context. Usually that's enough, and you'll run through your normal error paths.
//
// If another signal comes in after the first one, we'll trigger a panic with full stacktraces
// from every goroutine so that it's possible to debug what is stuck. Just before the process
// exits, we'll call the cleanup() function so that you can flush your log files.
func SetupSignals(log logger.Logger, cancel, cleanup func()) {
signals := make(chan os.Signal, 5)
// TODO: Handle other signals
signal.Notify(signals, os.Interrupt, syscall.SIGALRM)
go handleSignals(signals, log, cancel, cleanup)
}
func handleSignals(signals chan os.Signal, log logger.Logger, cancel, cleanup func()) {
defer cleanup()
var force bool
for {
s := <-signals
if force {
// So that we can better see what was stuck
debug.SetTraceback("all")
log.Panicln("Second signal received:", s)
} else {
log.Println("Got signal:", s)
cancel()
force = true
}
}
}
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