github.com/comwrg/go/src@v0.0.0-20220319063731-c238d0440370/os/signal/signal_unix.go (about)

     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  //go:build aix || darwin || dragonfly || freebsd || (js && wasm) || linux || netbsd || openbsd || solaris || windows
     6  // +build aix darwin dragonfly freebsd js,wasm linux netbsd openbsd solaris windows
     7  
     8  package signal
     9  
    10  import (
    11  	"os"
    12  	"syscall"
    13  )
    14  
    15  // Defined by the runtime package.
    16  func signal_disable(uint32)
    17  func signal_enable(uint32)
    18  func signal_ignore(uint32)
    19  func signal_ignored(uint32) bool
    20  func signal_recv() uint32
    21  
    22  func loop() {
    23  	for {
    24  		process(syscall.Signal(signal_recv()))
    25  	}
    26  }
    27  
    28  func init() {
    29  	watchSignalLoop = loop
    30  }
    31  
    32  const (
    33  	numSig = 65 // max across all systems
    34  )
    35  
    36  func signum(sig os.Signal) int {
    37  	switch sig := sig.(type) {
    38  	case syscall.Signal:
    39  		i := int(sig)
    40  		if i < 0 || i >= numSig {
    41  			return -1
    42  		}
    43  		return i
    44  	default:
    45  		return -1
    46  	}
    47  }
    48  
    49  func enableSignal(sig int) {
    50  	signal_enable(uint32(sig))
    51  }
    52  
    53  func disableSignal(sig int) {
    54  	signal_disable(uint32(sig))
    55  }
    56  
    57  func ignoreSignal(sig int) {
    58  	signal_ignore(uint32(sig))
    59  }
    60  
    61  func signalIgnored(sig int) bool {
    62  	return signal_ignored(uint32(sig))
    63  }