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
5package signal
6
7import (
8	"os"
9	"syscall"
10)
11
12var sigtab = make(map[os.Signal]int)
13
14// Defined by the runtime package.
15func signal_disable(uint32)
16func signal_enable(uint32)
17func signal_ignore(uint32)
18func signal_ignored(uint32) bool
19func signal_recv() string
20
21func init() {
22	watchSignalLoop = loop
23}
24
25func loop() {
26	for {
27		process(syscall.Note(signal_recv()))
28	}
29}
30
31const numSig = 256
32
33func signum(sig os.Signal) int {
34	switch sig := sig.(type) {
35	case syscall.Note:
36		n, ok := sigtab[sig]
37		if !ok {
38			n = len(sigtab) + 1
39			if n > numSig {
40				return -1
41			}
42			sigtab[sig] = n
43		}
44		return n
45	default:
46		return -1
47	}
48}
49
50func enableSignal(sig int) {
51	signal_enable(uint32(sig))
52}
53
54func disableSignal(sig int) {
55	signal_disable(uint32(sig))
56}
57
58func ignoreSignal(sig int) {
59	signal_ignore(uint32(sig))
60}
61
62func signalIgnored(sig int) bool {
63	return signal_ignored(uint32(sig))
64}
65