Source file src/pkg/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 freebsd linux netbsd openbsd windows
     6	
     7	package signal
     8	
     9	import (
    10		"os"
    11		"syscall"
    12	)
    13	
    14	// In assembly.
    15	func signal_enable(uint32)
    16	func signal_recv() uint32
    17	
    18	func loop() {
    19		for {
    20			process(syscall.Signal(signal_recv()))
    21		}
    22	}
    23	
    24	func init() {
    25		signal_enable(0) // first call - initialize
    26		go loop()
    27	}
    28	
    29	func enableSignal(sig os.Signal) {
    30		switch sig := sig.(type) {
    31		case nil:
    32			signal_enable(^uint32(0))
    33		case syscall.Signal:
    34			signal_enable(uint32(sig))
    35		default:
    36			// Can ignore: this signal (whatever it is) will never come in.
    37		}
    38	}