#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int main(int argc, char *argv[])
{
char server_ip[30] = "10.221.20.12";
int sockfd;
sockfd = socket(AF_INET, SOCK_DGRAM, 0); //创建UDP套接字
if(sockfd < 0)
{
perror("socket");
exit(-1);
}
struct sockaddr_in dest_addr;
bzero(&dest_addr, sizeof(dest_addr));
dest_addr.sin_family = AF_INET;
dest_addr.sin_port = htons(8080); // 服务器的端口
inet_pton(AF_INET, server_ip, &dest_addr.sin_addr);
char send_buf[512] = "this is for test";
// 如果前面没有绑定端口，sendto()系统会随机分配一个端口
sendto(sockfd, send_buf, strlen(send_buf), 0, (struct sockaddr*)&dest_addr, sizeof(dest_addr));//发送数据
// 初始化本地网络信息
struct sockaddr_in my_addr;
bzero(&my_addr, sizeof(my_addr));
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(8000);
my_addr.sin_addr.s_addr = htonl(INADDR_ANY);
// sendto()后面绑定端口，绑定失败
int err_log;
err_log = bind(sockfd, (struct sockaddr*)&my_addr, sizeof(my_addr));
if(err_log != 0)
{
perror("bind 8000");
close(sockfd);
exit(-1);
}
close(sockfd);
return 0;
}
