the buggy example of http://golang.org/pkg/rpc/ with two fixes

aclient.go

package main

import (
	"os"
	"rpc"
	"log"
	"strconv"
	"fmt"
	"./arith"
)


func main() {
	client, err := rpc.DialHTTP("tcp", os.Args[1])
	if err != nil {
		log.Exit("dialing:", err)
	}


	// Synchronous call
	n1,_ := strconv.Atoi(os.Args[3])
	n2,_ := strconv.Atoi(os.Args[4])
	args := &arith.Args{n1, n2}
	// XXX works only with Multiply
	var reply int
	err = client.Call("Arith." + os.Args[2], args, &reply)
	if err != nil {
		log.Exit("arith error:", err)
	}
	fmt.Printf("Arith: %d*%d=%d\n", args.A, args.B, *reply)
}

arith.go

package arith

import "os"

type Args struct {
	A, B int
}

type Quotient struct {
	Quo, Rem int
}

type Arith int

func (t *Arith) Multiply(args *Args, reply *int) os.Error {
	*reply = args.A * args.B
	return nil
}

func (t *Arith) Divide(args *Args, quo *Quotient) os.Error {
	if args.B == 0 {
		return os.ErrorString("divide by zero")
	}
	quo.Quo = args.A / args.B
	quo.Rem = args.A % args.B
	return nil
}

aserver.go

package main

import (
	"rpc"
	"net"
	"log"
	"http"
	"os"
	"./arith"
)

func main() {
	arith := new(arith.Arith)
	rpc.Register(arith)
	rpc.HandleHTTP()
	l, e := net.Listen("tcp", ":" + os.Args[1])
	if e != nil {
		log.Exit("listen error:", e)
	}
	http.Serve(l, nil)
}

fix1.diff

--- a/aclient.go
+++ b/aclient.go
@@ -27,5 +27,5 @@ func main() {
 	if err != nil {
 		log.Exit("arith error:", err)
 	}
-	fmt.Printf("Arith: %d*%d=%d\n", args.A, args.B, *reply)
+	fmt.Printf("Arith: %d*%d=%d\n", args.A, args.B, reply)
 }

fix2.diff

--- a/aclient.go
+++ b/aclient.go
@@ -22,7 +22,7 @@ func main() {
 	n2,_ := strconv.Atoi(os.Args[4])
 	args := &arith.Args{n1, n2}
 	// XXX works only with Multiply
-	var reply int
+	var reply *int
 	err = client.Call("Arith." + os.Args[2], args, &reply)
 	if err != nil {
 		log.Exit("arith error:", err)

Makefile

include $(GOROOT)/src/Make.inc

TARG=aserver\
	aclient

SHARED=arith

all: $(SHARED:%=%.$O) $(TARG)

$(TARG): %: %.$O
	$(LD) -o $@ $<

%.$O: %.go Makefile
	$(GC) -o $@ $<

clean:
	rm -f *.[$(OS)] $(TARG) $(CLEANFILES)