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Source file src/os/signal/signal_plan9.go

Documentation: os/signal

  // Copyright 2012 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package signal
  
  import (
  	"os"
  	"syscall"
  )
  
  var sigtab = make(map[os.Signal]int)
  
  // In sig.s; jumps to runtime.
  func signal_disable(uint32)
  func signal_enable(uint32)
  func signal_ignore(uint32)
  func signal_recv() string
  
  func init() {
  	signal_enable(0) // first call - initialize
  	go loop()
  }
  
  func loop() {
  	for {
  		process(syscall.Note(signal_recv()))
  	}
  }
  
  const numSig = 256
  
  func signum(sig os.Signal) int {
  	switch sig := sig.(type) {
  	case syscall.Note:
  		n, ok := sigtab[sig]
  		if !ok {
  			n = len(sigtab) + 1
  			if n > numSig {
  				return -1
  			}
  			sigtab[sig] = n
  		}
  		return n
  	default:
  		return -1
  	}
  }
  
  func enableSignal(sig int) {
  	signal_enable(uint32(sig))
  }
  
  func disableSignal(sig int) {
  	signal_disable(uint32(sig))
  }
  
  func ignoreSignal(sig int) {
  	signal_ignore(uint32(sig))
  }
  

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