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      1 // Copyright 2012 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 // +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris windows
      6 
      7 package signal
      8 
      9 import (
     10 	"os"
     11 	"syscall"
     12 )
     13 
     14 // Defined by the runtime package.
     15 func signal_disable(uint32)
     16 func signal_enable(uint32)
     17 func signal_ignore(uint32)
     18 func signal_recv() uint32
     19 
     20 func loop() {
     21 	for {
     22 		process(syscall.Signal(signal_recv()))
     23 	}
     24 }
     25 
     26 func init() {
     27 	signal_enable(0) // first call - initialize
     28 	go loop()
     29 }
     30 
     31 const (
     32 	numSig = 65 // max across all systems
     33 )
     34 
     35 func signum(sig os.Signal) int {
     36 	switch sig := sig.(type) {
     37 	case syscall.Signal:
     38 		i := int(sig)
     39 		if i < 0 || i >= numSig {
     40 			return -1
     41 		}
     42 		return i
     43 	default:
     44 		return -1
     45 	}
     46 }
     47 
     48 func enableSignal(sig int) {
     49 	signal_enable(uint32(sig))
     50 }
     51 
     52 func disableSignal(sig int) {
     53 	signal_disable(uint32(sig))
     54 }
     55 
     56 func ignoreSignal(sig int) {
     57 	signal_ignore(uint32(sig))
     58 }
     59