Linux系统udp模式下服务器与客户端通信（可同时多个客户端一起通讯）

//ser.c
#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>

#include<sys/socket.h>
#include<netinet/in.h>

int main()
{
int sockSer = socket(AF_INET, SOCK_DGRAM, 0);
if(sockSer == -1)
{
perror("socket");
exit(1);
}

struct sockaddr_in addrSer;
addrSer.sin_family = AF_INET;
addrSer.sin_port = htons(8080);//端口号
addrSer.sin_addr.s_addr = inet_addr("192.168.1.xx");//服务器地址

socklen_t addrlen = sizeof(struct sockaddr);
int ret = bind(sockSer, (struct sockaddr*)&addrSer, addrlen);
if(ret == -1)
{
perror("bind.");
exit(1);
}

struct sockaddr_in addrCli;

char sendbuf[256];
char recvbuf[256];
while(1)
{
recvfrom(sockSer, recvbuf, 256, 0, (struct sockaddr*)&addrCli, &addrlen);
printf("Cli:>%s\n", recvbuf);
printf("Ser:>");
scanf("%s",sendbuf);
sendto(sockSer, sendbuf, strlen(sendbuf)+1, 0, (struct sockaddr*)&addrCli, addrlen);
}

close(sockSer);
return 0;
}

//cli.c
#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>

#include<sys/socket.h>
#include<netinet/in.h>

int main()
{
int sockCli = socket(AF_INET, SOCK_DGRAM, 0);
if(sockCli == -1)
{
perror("socket");
exit(1);
}

struct sockaddr_in addrSer;
addrSer.sin_family = AF_INET;
addrSer.sin_port = htons(8080);//端口号
addrSer.sin_addr.s_addr = inet_addr("192.168.1.xx");//服务器地址

socklen_t addrlen = sizeof(struct sockaddr);

char sendbuf[256];
char recvbuf[256];
while(1)
{
printf("Cli:>");
scanf("%s",sendbuf);
sendto(sockCli, sendbuf, strlen(sendbuf)+1, 0, (struct sockaddr*)&addrSer, addrlen);

recvfrom(sockCli, recvbuf, 256, 0, (struct sockaddr*)&addrSer, &addrlen);
printf("Cli:>%s\n", recvbuf);
}
close(sockCli);
return 0;
}