Golang信号处理及如何实现进程的优雅退出详解

 Signal Value Action Comment
 ----------------------------------------------------------------------
 SIGHUP 1 Term Hangup detected on controlling terminal
     or death of controlling process
 SIGINT 2 Term Interrupt from keyboard
 SIGQUIT 3 Core Quit from keyboard
 SIGILL 4 Core Illegal Instruction
 SIGABRT 6 Core Abort signal from abort(3)
 SIGFPE 8 Core Floating point exception
 SIGKILL 9 Term Kill signal
 SIGSEGV 11 Core Invalid memory reference
 SIGPIPE 13 Term Broken pipe: write to pipe with no
     readers
 SIGALRM 14 Term Timer signal from alarm(2)
 SIGTERM 15 Term Termination signal
 SIGUSR1 30,10,16 Term User-defined signal 1
 SIGUSR2 31,12,17 Term User-defined signal 2
 SIGCHLD 20,17,18 Ign Child stopped or terminated
 SIGCONT 19,18,25 Cont Continue if stopped
 SIGSTOP 17,19,23 Stop Stop process
 SIGTSTP 18,20,24 Stop Stop typed at tty
 SIGTTIN 21,21,26 Stop tty input for background process
 SIGTTOU 22,22,27 Stop tty output for background process

 Signal Value Action Comment
 --------------------------------------------------------------------
 SIGBUS 10,7,10 Core Bus error (bad memory access)
 SIGPOLL   Term Pollable event (Sys V).
     Synonym for SIGIO
 SIGPROF 27,27,29 Term Profiling timer expired
 SIGSYS 12,-,12 Core Bad argument to routine (SVr4)
 SIGTRAP 5 Core Trace/breakpoint trap
 SIGURG 16,23,21 Ign Urgent condition on socket (4.2BSD)
 SIGVTALRM 26,26,28 Term Virtual alarm clock (4.2BSD)
 SIGXCPU 24,24,30 Core CPU time limit exceeded (4.2BSD)
 SIGXFSZ 25,25,31 Core File size limit exceeded (4.2BSD)

  Signal  Value  Action Comment
  --------------------------------------------------------------------
  SIGIOT   6  Core IOT trap. A synonym for SIGABRT
  SIGEMT  7,-,7  Term
  SIGSTKFLT -,16,-  Term Stack fault on coprocessor (unused)
  SIGIO  23,29,22 Term I/O now possible (4.2BSD)
  SIGCLD  -,-,18  Ign  A synonym for SIGCHLD
  SIGPWR  29,30,19 Term Power failure (System V)
  SIGINFO  29,-,-    A synonym for SIGPWR
  SIGLOST  -,-,-  Term File lock lost
  SIGWINCH 28,28,20 Ign  Window resize signal (4.3BSD, Sun)
  SIGUNUSED -,31,-  Term Unused signal (will be SIGSYS)

package main
import (
 "fmt"
 "os"
 "os/signal"
 "syscall"
)
func main() {
 sigs := make(chan os.Signal, 1)
 done := make(chan bool, 1)
 // signal.Notify(c)
 signal.Notify(sigs, os.Interrupt, os.Kill, syscall.SIGUSR1, syscall.SIGUSR2, syscall.SIGINT, syscall.SIGTERM)
 go func() {
 sig := <-sigs
 fmt.Println(sig)
 done <- true
 }()

 fmt.Println("wait for signal")
 <- done
 fmt.Println("got signal and exit")
 fmt.Println("run done")
}

package main
import (
 "fmt"
 "os"
 "os/signal"
 "syscall"
 "time"
)
 
func main() {
 sigs := make(chan os.Signal, 1)
 // done := make(chan bool, 1) 
 // signal.Notify(sigs)
 // signal.Notify(sigs, os.Interrupt, os.Kill, syscall.SIGUSR1, syscall.SIGUSR2, syscall.SIGINT, syscall.SIGTERM)
 signal.Notify(sigs, syscall.SIGUSR1, syscall.SIGUSR2, syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGQUIT) 
 // go func() {
 // sig := <-sigs
 // fmt.Println(sig)
 // done <- true
 // }()
 go func() {
 for s := range sigs {
 switch s {
 case syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGQUIT:
 fmt.Println("got signal and try to exit: ", s)
 do_exit()
 case syscall.SIGUSR1:
 fmt.Println("usr1: ", s)
 case syscall.SIGUSR2:
 fmt.Println("usr2: ", s)
 default:
 fmt.Println("other: ", s)
 }
 }
 }()
 
 
 fmt.Println("wait for signal")
 i := 0
 for {
 i++
 fmt.Println("times: ", i)
 time.Sleep(1 * time.Second)
 }
 // <- done
 fmt.Println("got signal and exit")
 fmt.Println("run done")
}
 
func do_exit() {
 fmt.Println("try do some clear jobs")
 fmt.Println("run done")
 os.Exit(0)
}

kill -USR1 pid 
usr1 user defined signal 1
 
kill -USR2 pid 
usr2 user defined signal 2
 
kill -QUIT pid 
got signal and try to exit: quit
try do some clear jobs
run done