Source file src/pkg/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		go loop()
    24	}
    25	
    26	func loop() {
    27		for {
    28			process(syscall.Note(signal_recv()))
    29		}
    30	}
    31	
    32	const numSig = 256
    33	
    34	func signum(sig os.Signal) int {
    35		switch sig := sig.(type) {
    36		case syscall.Note:
    37			n, ok := sigtab[sig]
    38			if !ok {
    39				n = len(sigtab) + 1
    40				if n > numSig {
    41					return -1
    42				}
    43				sigtab[sig] = n
    44			}
    45			return n
    46		default:
    47			return -1
    48		}
    49	}
    50	
    51	func enableSignal(sig int) {
    52		signal_enable(uint32(sig))
    53	}
    54	
    55	func disableSignal(sig int) {
    56		signal_disable(uint32(sig))
    57	}
    58	
    59	func ignoreSignal(sig int) {
    60		signal_ignore(uint32(sig))
    61	}
    62	
    63	func signalIgnored(sig int) bool {
    64		return signal_ignored(uint32(sig))
    65	}
    66	

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