这是在接触一段时间的Linux网络通信后,重新回过来熟悉一些基本函数功能,所以,这里不做任何代码注释。以后再看时,再慢慢去查看每一个函数的原型、参数含义、返回值以及调用方式,这样才能真正学到东西。
(4)关闭套接字
下面的代码都是经过我自己测试过的代码,没有使用select函数,只是一个一对一的简单TCP例程。
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define SERVER_PORT 2828
#define LISENT_NUM 10
int main(int argc, char * argv[])
{
int sfd, cfd;
struct sockaddr_in clientaddr;
struct sockaddr_in serverAddr;
char buff[1024];
int size = sizeof(struct sockaddr);
pthread_t client_thread[LISENT_NUM];
if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("socket");
exit(-1);
}
memset(&serverAddr, 0, sizeof(struct sockaddr));
serverAddr.sin_family = AF_INET;
serverAddr.sin_addr.s_addr = INADDR_ANY;
serverAddr.sin_port = htons(SERVER_PORT);
if (bind(sfd, (struct sockaddr*)&serverAddr, sizeof(struct sockaddr)) == -1)
{
perror("bind");
close(sfd);
exit(-1);
}
if (listen(sfd, LISENT_NUM) == -1)
{
perror("listen");
close(sfd);
exit(-1);
}
printf("#@ listen SERVER_PORT %d\n", SERVER_PORT);
printf("main:server waiting connect...\n");
if ((cfd = accept(sfd, (struct sockaddr *)&clientaddr, (socklen_t*)&size)) == -1)
{
perror("accept");
close(sfd);
return 0;
}
printf("client (ip = %s : SERVER_PORT = %d) connect success\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));
while (1)
{
usleep(1000*100);
if (send(cfd, "hello", 6, MSG_NOSIGNAL) == -1)
{
perror("send");
exit(-1);
}
printf("send: hello\n");
usleep(1000*100);
if (recv(cfd, buff, sizeof(buff), 0) == -1)
{
perror("recv");
exit(-1);
}
printf("receive: %s\n", buff);
}
return 0;
}
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define SERVER_PORT 2828
int main(int argc, char * argv[])
{
int sockfd, len;
char buf[1024];
struct sockaddr_in clientAddr;
struct sockaddr_in serverAddr;
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("socket");
exit(-1);
}
memset(&serverAddr, 0, sizeof(serverAddr));
serverAddr.sin_family = AF_INET;
serverAddr.sin_addr.s_addr = inet_addr("30.252.22.10");
serverAddr.sin_port = htons(SERVER_PORT);
printf("connect server %s: %d\n", inet_ntoa(serverAddr.sin_addr), SERVER_PORT);
if (connect(sockfd, (struct sockaddr *)&serverAddr, sizeof(struct sockaddr)) == -1)
{
perror("connect");
exit(-1);
}
printf("connect success!\n");
while (1)
{
send(sockfd, "hello", 6, 0);
len = recv(sockfd, buf, sizeof(buf), 0);
if (len == -1)
break;
printf("receive: %s\n", buf);
}
printf("client exit!\n");
close(sockfd);
}