任务1：编写基于socket的udp发送接收程序（45min）
任务要求
- 编写C源码，基于socket的udp发送接收程序，实现客户端与服务端的简单通信。
- 客户端从命令行输入中读取要发送的内容，服务端接收后实时显示。
任务代码
1、客户端 client.c
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#define PORT 40000
#define BUF_SIZE 1024
int main(void)
{
int sock_fd;
char buffer[BUF_SIZE];
int size;
int len;
int ret;
struct sockaddr_in server_addr;
if(-1 == (sock_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP)) ){
printf("Failed to create a socket!\n");
return 0;
}
//server infomation
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(PORT);
server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
bzero(buffer, BUF_SIZE);
len = sizeof(server_addr);
//read from stdin and send to server
while(1){
printf("Please enter the content to be sent:\n");
size = read(0, buffer, BUF_SIZE);
if(size){
sendto(sock_fd, buffer, size, 0, (struct sockaddr*)&server_addr, len);
bzero(buffer
