TCP通信端口复用demo
作者:互联网
server.c:
#include <stdio.h>
#include <ctype.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char *argv[]) {
// 创建socket
int lfd = socket(PF_INET, SOCK_STREAM, 0);
if(lfd == -1) {
perror("socket");
return -1;
}
struct sockaddr_in saddr;
saddr.sin_family = AF_INET;
saddr.sin_addr.s_addr = INADDR_ANY;
saddr.sin_port = htons(9999);
//int optval = 1;
//setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval));
int optval = 1;
setsockopt(lfd, SOL_SOCKET, SO_REUSEPORT, &optval, sizeof(optval));
// 绑定
int ret = bind(lfd, (struct sockaddr *)&saddr, sizeof(saddr));
if(ret == -1) {
perror("bind");
return -1;
}
// 监听
ret = listen(lfd, 8);
if(ret == -1) {
perror("listen");
return -1;
}
// 接收客户端连接
struct sockaddr_in cliaddr;
socklen_t len = sizeof(cliaddr);
int cfd = accept(lfd, (struct sockaddr *)&cliaddr, &len);
if(cfd == -1) {
perror("accpet");
return -1;
}
// 获取客户端信息
char cliIp[16];
inet_ntop(AF_INET, &cliaddr.sin_addr.s_addr, cliIp, sizeof(cliIp));
unsigned short cliPort = ntohs(cliaddr.sin_port);
// 输出客户端的信息
printf("client's ip is %s, and port is %d\n", cliIp, cliPort );
// 接收客户端发来的数据
char recvBuf[1024] = {0};
while(1) {
int len = recv(cfd, recvBuf, sizeof(recvBuf), 0);
if(len == -1) {
perror("recv");
return -1;
} else if(len == 0) {
printf("客户端已经断开连接...\n");
break;
} else if(len > 0) {
printf("read buf = %s\n", recvBuf);
}
// 小写转大写
for(int i = 0; i < len; ++i) {
recvBuf[i] = toupper(recvBuf[i]);
}
printf("after buf = %s\n", recvBuf);
// 大写字符串发给客户端
ret = send(cfd, recvBuf, strlen(recvBuf) + 1, 0);
if(ret == -1) {
perror("send");
return -1;
}
}
close(cfd);
close(lfd);
return 0;
}
client.c:
#include <stdio.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
int main() {
// 创建socket
int fd = socket(PF_INET, SOCK_STREAM, 0);
if(fd == -1) {
perror("socket");
return -1;
}
struct sockaddr_in seraddr;
inet_pton(AF_INET, "127.0.0.1", &seraddr.sin_addr.s_addr);
seraddr.sin_family = AF_INET;
seraddr.sin_port = htons(9999);
// 连接服务器
int ret = connect(fd, (struct sockaddr *)&seraddr, sizeof(seraddr));
if(ret == -1){
perror("connect");
return -1;
}
while(1) {
char sendBuf[1024] = {0};
fgets(sendBuf, sizeof(sendBuf), stdin);
write(fd, sendBuf, strlen(sendBuf) + 1);
// 接收
int len = read(fd, sendBuf, sizeof(sendBuf));
if(len == -1) {
perror("read");
return -1;
}else if(len > 0) {
printf("read buf = %s\n", sendBuf);
} else {
printf("服务器已经断开连接...\n");
break;
}
}
close(fd);
return 0;
}
PS:主要是调用setsockopt函数来对套接字进行设置。
标签:return,int,demo,复用,TCP,len,perror,sizeof,include 来源: https://blog.csdn.net/qq_35353824/article/details/117435620