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¸½£ºUDP·þÎñ¶Ë³ÌÐò

#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<unistd.h>
#include<errno.h>
#include<string.h>
#include<stdlib.h>
#define SERV_PORT 3001

int main()
{
int sock_fd;
int recv_num;
int send_num;
int client_len;
char recv_buf[20];
struct sockaddr_in addr_serv;
struct sockaddr_in addr_client;
sock_fd = socket(AF_INET,SOCK_DGRAM,0);
if(sock_fd < 0){
perror("socket");
exit(1);
} else{
printf("sock sucessful\n");
}
memset(&addr_serv,0,sizeof(struct sockaddr_in));
addr_serv.sin_family = AF_INET;
addr_serv.sin_port = htons(SERV_PORT);
addr_serv.sin_addr.s_addr = htonl(INADDR_ANY);
client_len = sizeof(struct sockaddr_in);

if(bind(sock_fd,(struct sockaddr *)&addr_serv,sizeof(struct sockaddr_in))<0 ){
perror("bind");
exit(1);
} else{

printf("bind sucess\n");
}
while(1){
printf("begin recv:\n");
recv_num = recvfrom(sock_fd,recv_buf,sizeof(recv_buf),0,(struct sockaddr *)&addr_client,&client_len);
if(recv_num < 0){
printf("bad\n");
perror("again recvfrom");
exit(1);
} else{
recv_buf[recv_num]='\0';
printf("recv sucess:%s\n",recv_buf);
}
printf("begin send:\n");
send_num = sendto(sock_fd,recv_buf,recv_num,0,(struct sockaddr *)&addr_client,client_len);
if(send_num < 0){
perror("sendto");
exit(1);
} else{
printf("send sucessful\n");
}
}
close(sock_fd);
return 0;
}

 

   
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