libgo/go/os/signal/signal_unix.go

   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 // In assembly.
  15 func signal_disable(uint32)
  16 func signal_enable(uint32)
  17 func signal_recv() uint32
  18
  19 func loop() {
  20         for {
  21                 process(syscall.Signal(signal_recv()))
  22         }
  23 }
  24
  25 func init() {
  26         signal_enable(0) // first call - initialize
  27         go loop()
  28 }
  29
  30 const (
  31         numSig = 65 // max across all systems
  32 )
  33
  34 func signum(sig os.Signal) int {
  35         switch sig := sig.(type) {
  36         case syscall.Signal:
  37                 i := int(sig)
  38                 if i < 0 || i >= numSig {
  39                         return -1
  40                 }
  41                 return i
  42         default:
  43                 return -1
  44         }
  45 }
  46
  47 func enableSignal(sig int) {
  48         signal_enable(uint32(sig))
  49 }
  50
  51 func disableSignal(sig int) {
  52         signal_disable(uint32(sig))
  53 }