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signal_linux.go
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signal_linux.go
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// Copyright (c) 2018-2019, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package signal
/*
#include <signal.h>
void raiseSignal(int sig) {
signal(sig, SIG_DFL);
raise(sig);
}
*/
import "C"
import (
"fmt"
"strconv"
"strings"
"golang.org/x/sys/unix"
)
// similarSignals maps similar signals not handled
// by unix package.
var similarSignals = map[string]string{
"SIGIOT": "SIGABRT",
"SIGCLD": "SIGCHLD",
"SIGPOLL": "SIGIO",
}
// Convert converts a signal string to corresponding signal number
func Convert(sig string) (unix.Signal, error) {
sigStr := strings.ToUpper(sig)
if !strings.HasPrefix(sigStr, "SIG") {
sigStr = "SIG" + sigStr
}
if s, ok := similarSignals[sigStr]; ok {
sigStr = s
}
sigNum := unix.SignalNum(sigStr)
if sigNum != 0 {
return sigNum, nil
}
sigConv, err := strconv.ParseInt(sig, 10, 32)
if err != nil {
return sigNum, fmt.Errorf("%s is not a number", sig)
}
sigName := unix.SignalName(unix.Signal(sigConv))
sigNum = unix.SignalNum(sigName)
if sigNum == 0 {
return sigNum, fmt.Errorf("can't convert %s to signal number", sig)
}
return sigNum, nil
}
// Raise sends a signal to the current process and ensure the
// current signal handler is set to its default handler for the
// corresponding signal. It allows to send signals like SIGABRT
// without triggering Go core dump handler.
func Raise(sig unix.Signal) {
// signal handlers like the one for SIGABRT can't be reset
// easily from Go without using rt_sigaction syscall implying
// to defines sigaction structure for various architecture so
// let's proceed with C
C.raiseSignal(C.int(int(sig)))
}