9af5fb9ac8
Bug: 35214134
Test: ctrl-C during build
Test: add for{} to hang soong_ui in multiple places, ensure it exits
Change-Id: Ic71eedd4b1814ab2f3c441ae61a97570eda4fe16
94 lines
3 KiB
Go
94 lines
3 KiB
Go
// 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"
|
|
"time"
|
|
)
|
|
|
|
// SetupSignals sets up signal handling to ensure all of our subprocesses are killed and that
|
|
// our log/trace buffers are flushed to disk.
|
|
//
|
|
// All of our subprocesses are in the same process group, so they'll receive a SIGINT at the
|
|
// same time we do. Most of the time this means we just need to ignore the signal and we'll
|
|
// just see errors from all of our subprocesses. But in case that fails, when we get a signal:
|
|
//
|
|
// 1. Wait two seconds to exit normally.
|
|
// 2. Call cancel() which is normally the cancellation of a Context. This will send a SIGKILL
|
|
// to any subprocesses attached to that context.
|
|
// 3. Wait two seconds to exit normally.
|
|
// 4. Call cleanup() to close the log/trace buffers, then panic.
|
|
// 5. If another two seconds passes (if cleanup got stuck, etc), then panic.
|
|
//
|
|
func SetupSignals(log logger.Logger, cancel, cleanup func()) {
|
|
signals := make(chan os.Signal, 5)
|
|
signal.Notify(signals, os.Interrupt, syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGTERM)
|
|
go handleSignals(signals, log, cancel, cleanup)
|
|
}
|
|
|
|
func handleSignals(signals chan os.Signal, log logger.Logger, cancel, cleanup func()) {
|
|
var timeouts int
|
|
var timeout <-chan time.Time
|
|
|
|
handleTimeout := func() {
|
|
timeouts += 1
|
|
switch timeouts {
|
|
case 1:
|
|
// Things didn't exit cleanly, cancel our ctx (SIGKILL to subprocesses)
|
|
// Do this asynchronously to ensure it won't block and prevent us from
|
|
// taking more drastic measures.
|
|
log.Println("Still alive, killing subprocesses...")
|
|
go cancel()
|
|
case 2:
|
|
// Cancel didn't work. Try to run cleanup manually, then we'll panic
|
|
// at the next timer whether it finished or not.
|
|
log.Println("Still alive, cleaning up...")
|
|
|
|
// Get all stacktraces to see what was stuck
|
|
debug.SetTraceback("all")
|
|
|
|
go func() {
|
|
defer log.Panicln("Timed out exiting...")
|
|
cleanup()
|
|
}()
|
|
default:
|
|
// In case cleanup() deadlocks, the next tick will panic.
|
|
log.Panicln("Got signal, but timed out exiting...")
|
|
}
|
|
}
|
|
|
|
for {
|
|
select {
|
|
case s := <-signals:
|
|
log.Println("Got signal:", s)
|
|
|
|
// Another signal triggers our next timeout handler early
|
|
if timeout != nil {
|
|
handleTimeout()
|
|
}
|
|
|
|
// Wait 2 seconds for everything to exit cleanly.
|
|
timeout = time.Tick(time.Second * 2)
|
|
case <-timeout:
|
|
handleTimeout()
|
|
}
|
|
}
|
|
}
|