github.com/whtcorpsinc/MilevaDB-Prod@v0.0.0-20211104133533-f57f4be3b597/soliton/signal/signal_posix.go (about)

     1  // Copyright 2020 WHTCORPS INC, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  // +build linux darwin freebsd unix
    14  
    15  package signal
    16  
    17  import (
    18  	"log"
    19  	"os"
    20  	"os/signal"
    21  	"runtime"
    22  	"syscall"
    23  
    24  	"github.com/whtcorpsinc/milevadb/soliton/logutil"
    25  	"go.uber.org/zap"
    26  )
    27  
    28  // SetupSignalHandler setup signal handler for MilevaDB Server
    29  func SetupSignalHandler(shutdownFunc func(bool)) {
    30  	usrDefSignalChan := make(chan os.Signal, 1)
    31  
    32  	signal.Notify(usrDefSignalChan, syscall.SIGUSR1)
    33  	go func() {
    34  		buf := make([]byte, 1<<16)
    35  		for {
    36  			sig := <-usrDefSignalChan
    37  			if sig == syscall.SIGUSR1 {
    38  				stackLen := runtime.Stack(buf, true)
    39  				log.Printf("\n=== Got signal [%s] to dump goroutine stack. ===\n%s\n=== Finished dumping goroutine stack. ===\n", sig, buf[:stackLen])
    40  			}
    41  		}
    42  	}()
    43  
    44  	closeSignalChan := make(chan os.Signal, 1)
    45  	signal.Notify(closeSignalChan,
    46  		syscall.SIGHUP,
    47  		syscall.SIGINT,
    48  		syscall.SIGTERM,
    49  		syscall.SIGQUIT)
    50  
    51  	go func() {
    52  		sig := <-closeSignalChan
    53  		logutil.BgLogger().Info("got signal to exit", zap.Stringer("signal", sig))
    54  		shutdownFunc(sig == syscall.SIGQUIT)
    55  	}()
    56  }