libgo/go/os/signal/signal_plan9.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 package signal
   6
   7 import (
   8         "os"
   9         "syscall"
  10 )
  11
  12 var sigtab = make(map[os.Signal]int)
  13
  14 // In sig.s; jumps to runtime.
  15 func signal_disable(uint32)
  16 func signal_enable(uint32)
  17 func signal_ignore(uint32)
  18 func signal_ignored(uint32) bool
  19 func signal_recv() string
  20
  21 func init() {
  22         signal_enable(0) // first call - initialize
  23
  24         watchSignalLoop = loop
  25 }
  26
  27 func loop() {
  28         for {
  29                 process(syscall.Note(signal_recv()))
  30         }
  31 }
  32
  33 const numSig = 256
  34
  35 func signum(sig os.Signal) int {
  36         switch sig := sig.(type) {
  37         case syscall.Note:
  38                 n, ok := sigtab[sig]
  39                 if !ok {
  40                         n = len(sigtab) + 1
  41                         if n > numSig {
  42                                 return -1
  43                         }
  44                         sigtab[sig] = n
  45                 }
  46                 return n
  47         default:
  48                 return -1
  49         }
  50 }
  51
  52 func enableSignal(sig int) {
  53         signal_enable(uint32(sig))
  54 }
  55
  56 func disableSignal(sig int) {
  57         signal_disable(uint32(sig))
  58 }
  59
  60 func ignoreSignal(sig int) {
  61         signal_ignore(uint32(sig))
  62 }
  63
  64 func signalIgnored(sig int) bool {
  65         return signal_ignored(uint32(sig))
  66 }