added dependency github.com/sevlyar/go-daemon

vendor/github.com/sevlyar/go-daemon/command.go

@@ -0,0 +1,99 @@
+package daemon
+
+import (
+	"os"
+)
+
+// AddCommand is wrapper on AddFlag and SetSigHandler functions.
+func AddCommand(f Flag, sig os.Signal, handler SignalHandlerFunc) {
+	if f != nil {
+		AddFlag(f, sig)
+	}
+	if handler != nil {
+		SetSigHandler(handler, sig)
+	}
+}
+
+// Flag is the interface implemented by an object that has two state:
+// 'set' and 'unset'.
+type Flag interface {
+	IsSet() bool
+}
+
+// BoolFlag returns new object that implements interface Flag and
+// has state 'set' when var with the given address is true.
+func BoolFlag(f *bool) Flag {
+	return &boolFlag{f}
+}
+
+// StringFlag returns new object that implements interface Flag and
+// has state 'set' when var with the given address equals given value of v.
+func StringFlag(f *string, v string) Flag {
+	return &stringFlag{f, v}
+}
+
+type boolFlag struct {
+	b *bool
+}
+
+func (f *boolFlag) IsSet() bool {
+	if f == nil {
+		return false
+	}
+	return *f.b
+}
+
+type stringFlag struct {
+	s *string
+	v string
+}
+
+func (f *stringFlag) IsSet() bool {
+	if f == nil {
+		return false
+	}
+	return *f.s == f.v
+}
+
+var flags = make(map[Flag]os.Signal)
+
+// Flags returns flags that was added by the function AddFlag.
+func Flags() map[Flag]os.Signal {
+	return flags
+}
+
+// AddFlag adds the flag and signal to the internal map.
+func AddFlag(f Flag, sig os.Signal) {
+	flags[f] = sig
+}
+
+// SendCommands sends active signals to the given process.
+func SendCommands(p *os.Process) (err error) {
+	for _, sig := range signals() {
+		if err = p.Signal(sig); err != nil {
+			return
+		}
+	}
+	return
+}
+
+// ActiveFlags returns flags that has the state 'set'.
+func ActiveFlags() (ret []Flag) {
+	ret = make([]Flag, 0, 1)
+	for f := range flags {
+		if f.IsSet() {
+			ret = append(ret, f)
+		}
+	}
+	return
+}
+
+func signals() (ret []os.Signal) {
+	ret = make([]os.Signal, 0, 1)
+	for f, sig := range flags {
+		if f.IsSet() {
+			ret = append(ret, sig)
+		}
+	}
+	return
+}