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// Copyright 2015 Matthew Holt and The Caddy Authors
//
// 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.
//go:build !windows && !plan9 && !nacl && !js
package caddy
import (
"context"
"os"
"os/signal"
"syscall"
"github.com/caddyserver/certmagic"
"go.uber.org/zap"
)
// trapSignalsPosix captures POSIX-only signals.
func trapSignalsPosix() {
// Ignore all SIGPIPE signals to prevent weird issues with systemd: https://github.com/dunglas/frankenphp/issues/1020
// Docker/Moby has a similar hack: https://github.com/moby/moby/blob/d828b032a87606ae34267e349bf7f7ccb1f6495a/cmd/dockerd/docker.go#L87-L90
signal.Ignore(syscall.SIGPIPE)
go func() {
sigchan := make(chan os.Signal, 1)
signal.Notify(sigchan, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGUSR1, syscall.SIGUSR2)
for sig := range sigchan {
switch sig {
case syscall.SIGQUIT:
Log().Info("quitting process immediately", zap.String("signal", "SIGQUIT"))
certmagic.CleanUpOwnLocks(context.TODO(), Log()) // try to clean up locks anyway, it's important
os.Exit(ExitCodeForceQuit)
case syscall.SIGTERM:
Log().Info("shutting down apps, then terminating", zap.String("signal", "SIGTERM"))
exitProcessFromSignal("SIGTERM")
case syscall.SIGUSR1:
Log().Info("not implemented", zap.String("signal", "SIGUSR1"))
case syscall.SIGUSR2:
Log().Info("not implemented", zap.String("signal", "SIGUSR2"))
case syscall.SIGHUP:
// ignore; this signal is sometimes sent outside of the user's control
Log().Info("not implemented", zap.String("signal", "SIGHUP"))
}
}
}()
}
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