golang报socket:operation not permitted

hey，大家好，最近我在看golang基础部分，尝试了《Go语言编程》中关于socket编程，我试验了以下代码，却提示我说Fatal error: dial ip4:icmp 78.216.200.70: socket: operation not permitted,我已经确认ping存在，且已使用chmod将ping权限设置为u+s，我的系统是os x，代码如下: ``` package main import ( "os" "fmt" "net" "bytes" "io" ) func main() { if len(os.Args) != 2 { fmt.Println("Usage: ", os.Args[0], "host") os.Exit(1) } service := os.Args[1] conn, err := net.Dial("ip4:icmp", service) checkError(err) var msg [512]byte msg[0] = 8 // echo msg[1] = 0 // code 0 msg[2] = 0 // checksum msg[3] = 0 // checksum msg[4] = 0 // identifier[0] msg[5] = 13 //identifier[1] msg[6] = 0 // sequence[0] msg[7] = 37 // sequence[1] len := 8 check := checkSum(msg[0:len]) msg[2] = byte(check >> 8) msg[3] = byte(check & 255) _, err = conn.Write(msg[0:len]) checkError(err) _, err = conn.Read(msg[0:]) fmt.Println("Got response") if msg[5] == 13 { fmt.Println("Identifier matches") } if msg[7] == 37 { fmt.Println("Sequence matches") } os.Exit(0) } func checkSum(msg []byte) uint16 { sum := 0 for n := 1; n < len(msg)-1; n += 2 { sum += int(msg[n])*256 + int(msg[n+1]) } sum = (sum >> 16) + (sum & 0xffff) sum += (sum >> 16) var answer uint16 = uint16(^sum) return answer } func readFully(conn net.Conn) ([]byte, error) { defer conn.Close() result := bytes.NewBuffer(nil) var buf [512]byte for { n, err := conn.Read(buf[0:]) result.Write(buf[0:n]) if err != nil { if err == io.EOF { break } return nil, err } } return result.Bytes(), nil } func checkError(err error) { if err != nil { fmt.Fprintf(os.Stderr, "Fatal error: %s", err.Error()) } os.Exit(1) } ``` 请问我这个问题出在哪里呢