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signal.go
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signal.go
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package main
import (
"fmt"
"sort"
"strconv"
"strings"
"syscall"
"github.com/pkg/errors"
"golang.org/x/sys/unix"
)
// ParseSignal parses a signal by name or number.
func ParseSignal(s string) (syscall.Signal, bool) {
// Look up signal by name, e.g. SIGINT
if signal := unix.SignalNum(s); signal != 0 {
return signal, true
}
// Lookup by signal number
if sigNum, err := strconv.Atoi(s); err == nil {
signal := syscall.Signal(sigNum)
if unix.SignalName(signal) != "" {
return signal, true
}
}
return 0, false
}
// ParseSignals parses a string of signal numbers or names, joined with comma.
func ParseSignals(s string) ([]syscall.Signal, error) {
split := strings.Split(s, ",")
signals := make([]syscall.Signal, 0, len(split))
for _, s := range split {
signal, ok := ParseSignal(s)
if !ok {
return nil, fmt.Errorf("cannot parse signal: %v", s)
}
signals = append(signals, signal)
}
return signals, nil
}
// ParseSignalsFromArgs parses a list of arguments into a list of signals.
func ParseSignalsFromArgs(args []string) ([]syscall.Signal, error) {
sigMap := make(map[int]syscall.Signal)
for _, arg := range args {
parsed, err := ParseSignals(arg)
if err != nil {
return nil, errors.Wrapf(err, "cannot parse arg: %v", arg)
}
for _, sig := range parsed {
sigMap[int(sig)] = sig
}
}
signals := make([]syscall.Signal, 0, len(sigMap))
for _, sig := range sigMap {
signals = append(signals, sig)
}
sort.Slice(signals, func(i, j int) bool {
return signals[i] < signals[j]
})
return signals, nil
}