Linux socket通信(UDP)

udp服务端

#include<stdio.h>
#include <sys/socket.h>
#include<string.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netinet/in.h>
#define UDP_PORT 8888
int main()
{


     int socket_ser;
     char bufrec[1500];
     char ipbuf[16];
     socket_ser = socket(AF_INET,SOCK_DGRAM,0);
     struct sockaddr_in addr,addr_c;
     bzero(&addr,sizeof(addr));
     addr.sin_family = AF_INET;
     addr.sin_port = htons(UDP_PORT);
     addr.sin_addr.s_addr = htonl(INADDR_ANY);
     bind(socket_ser,(struct sockaddr *)&addr,sizeof(addr));

     while(1)
     {
         bzero(bufrec,sizeof(bufrec));
         bzero(&ipbuf,sizeof(ipbuf));
         socklen_t len = sizeof(addr_c);
         uint length = recvfrom(socket_ser,bufrec, sizeof(bufrec),0,(struct sockaddr*)&addr_c,&len);
         inet_ntop(AF_INET,&addr_c.sin_addr.s_addr,ipbuf,sizeof(ipbuf));

         printf("Ip is %s,port is %d\n",ipbuf,ntohs(addr_c.sin_port));
         printf("%s\n",bufrec);
         sendto(socket_ser,bufrec,strlen(bufrec),0,(struct sockaddr*)&addr_c,sizeof(addr_c));
     }
     close(socket_ser);
     return 0;
 }

UDP无需三次握手四次挥手，因此没必要使用list去维护队列，accept也不再需要。

客户端

#include<stdio.h>
#include <sys/socket.h>
#include<string.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netinet/in.h>
#define UDP_PORT 8888
int main()
{


     int socketcli;
     char bufsend[] ="hello world";
     char bufrec[1500];
     char ipbuf[16];
     socketcli = socket(AF_INET,SOCK_DGRAM,0);
     struct sockaddr_in addr;
     bzero(&addr,sizeof(addr));
     bzero(&bufrec,sizeof(bufrec));
     addr.sin_family = AF_INET;
     addr.sin_port = htons(UDP_PORT);
     addr.sin_addr.s_addr = htonl(INADDR_ANY);

     sendto(socketcli,bufsend,strlen(bufsend),0,(struct sockaddr*)&addr, sizeof(addr));

     recvfrom(socketcli,bufrec, sizeof(bufrec),0,NULL,NULL);
     printf("%s\n",bufrec);

     return 0;
 }

客户端的recvfrom最后两个参数是传回服务端的地址端口等信息和长度，由于客户端本就已经知道因此可以直接设置为NULL

Linux socket通信(UDP)

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