add ntp

src/rpc/client/client.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"errors"
+	"net/rpc"
+	"log"
+	"fmt"
+)
+
+type Args struct {
+	A, B int
+}
+
+type Quotient struct {
+	Quo, Rem int
+}
+
+type Arith int
+
+func (t *Arith) Multiply(args *Args, reply *int) error {
+	*reply = args.A * args.B
+	return nil
+}
+
+func (t *Arith) Divide(args *Args, quo *Quotient) error {
+	if args.B == 0 {
+		return errors.New("divide by zero")
+	}
+	quo.Quo = args.A / args.B
+	quo.Rem = args.A % args.B
+	return nil
+}
+
+func main() {
+	serverAddress := "127.0.0.1"
+	client, err := rpc.DialHTTP("udp", serverAddress + ":1234")
+	if err != nil {
+		log.Fatal("Fatal error:", err)
+	}
+	//args := &server.Args{7, 8}
+	var args Args = Args{7, 8}
+	var reply int
+	err = client.Call("Arith.Multiply", args, &reply)
+	if err != nil {
+		log.Fatal("arith error:", err)
+	}
+	fmt.Printf("Arith: %d * %d = %d", args.A, args.B, reply)
+}

src/rpc/server/server.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"errors"
+	"net/rpc"
+	"net"
+	"log"
+	"net/http"
+)
+
+type Args struct {
+	A, B int
+}
+
+type Quotient struct {
+	Quo, Rem int
+}
+
+type Arith int
+
+func (t *Arith) Multiply(args *Args, reply *int) error {
+	*reply = args.A * args.B
+	return nil
+}
+
+func (t *Arith) Divide(args *Args, quo *Quotient) error {
+	if args.B == 0 {
+		return errors.New("divide by zero")
+	}
+	quo.Quo = args.A / args.B
+	quo.Rem = args.A % args.B
+	return nil
+}
+
+func main() {
+	arith := new(Arith)
+	rpc.Register(arith)
+	rpc.HandleHTTP()
+	l, e := net.Listen("udp", ":1234")
+	if e != nil {
+		log.Fatal("Fatal error:", e)
+	}
+	http.Serve(l, nil)
+}