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package signal
import (
"fmt"
"os"
"os/signal"
"strconv"
"strings"
"syscall"
)
// ParseSignal translates a string to a valid syscall signal.
// It returns an error if the signal map doesn't include the given signal.
func ParseSignal(rawSignal string) (syscall.Signal, error) {
s, err := strconv.Atoi(rawSignal)
if err == nil {
if s == 0 {
return -1, fmt.Errorf("invalid signal: %s", rawSignal)
}
return syscall.Signal(s), nil
}
sig, ok := SignalMap[strings.TrimPrefix(strings.ToUpper(rawSignal), "SIG")]
if !ok {
return -1, fmt.Errorf("invalid signal: %s", rawSignal)
}
return sig, nil
}
// ParseSignalNameOrNumber translates a string to a valid syscall signal. Input
// can be a name or number representation i.e. "KILL" "9".
func ParseSignalNameOrNumber(rawSignal string) (syscall.Signal, error) {
basename := strings.TrimPrefix(rawSignal, "-")
s, err := ParseSignal(basename)
if err == nil {
return s, nil
}
for k, v := range SignalMap {
if k == strings.ToUpper(basename) {
return v, nil
}
}
return -1, fmt.Errorf("invalid signal: %s", basename)
}
// CatchAll catches all signals and relays them to the specified channel.
func CatchAll(sigc chan os.Signal) {
handledSigs := make([]os.Signal, 0, len(SignalMap))
for _, s := range SignalMap {
handledSigs = append(handledSigs, s)
}
signal.Notify(sigc, handledSigs...)
}
// StopCatch stops catching the signals and closes the specified channel.
func StopCatch(sigc chan os.Signal) {
signal.Stop(sigc)
close(sigc)
}
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