最近做的东西与socket十分紧密，所以很好奇它具体是如何实现的，以前也有了解过，但是又忘记了，于是把它记录下来，以便日后查看。
服务器端：server.c
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/shm.h> #define MYPORT 8887
#define QUEUE 20
#define BUFFER_SIZE 1024 int main()
{
///定义sockfd
int server_sockfd = socket(AF_INET,SOCK_STREAM, ); ///定义sockaddr_in
struct sockaddr_in server_sockaddr;
server_sockaddr.sin_family = AF_INET;
server_sockaddr.sin_port = htons(MYPORT);
server_sockaddr.sin_addr.s_addr = htonl(INADDR_ANY); ///bind，成功返回0，出错返回-1
if(bind(server_sockfd,(struct sockaddr *)&server_sockaddr,sizeof(server_sockaddr))==-)
{
perror("bind");
exit();
} ///listen，成功返回0，出错返回-1
if(listen(server_sockfd,QUEUE) == -)
{
perror("listen");
exit();
} ///客户端套接字
char buffer[BUFFER_SIZE];
struct sockaddr_in client_addr;
socklen_t length = sizeof(client_addr); ///成功返回非负描述字，出错返回-1
int conn = accept(server_sockfd, (struct sockaddr*)&client_addr, &length);
if(conn<)
{
perror("connect");
exit();
} while()
{
memset(buffer,,sizeof(buffer));
int len = recv(conn, buffer, sizeof(buffer),);
if(strcmp(buffer,"exit\n")==)
break;
fputs(buffer, stdout);
send(conn, buffer, len, );
}
close(conn);
close(server_sockfd);
return ;
}
客户端：client.c
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/shm.h> #define MYPORT 8887
#define BUFFER_SIZE 1024 int main()
{
///定义sockfd
int sock_cli = socket(AF_INET,SOCK_STREAM, ); ///定义sockaddr_in
struct sockaddr_in servaddr;
memset(&servaddr, , sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(MYPORT); ///服务器端口
servaddr.sin_addr.s_addr = inet_addr("127.0.0.1"); ///服务器ip ///连接服务器，成功返回0，错误返回-1
if (connect(sock_cli, (struct sockaddr *)&servaddr, sizeof(servaddr)) < )
{
perror("connect");
exit();
} char sendbuf[BUFFER_SIZE];
char recvbuf[BUFFER_SIZE];
while (fgets(sendbuf, sizeof(sendbuf), stdin) != NULL)
{
send(sock_cli, sendbuf, strlen(sendbuf),); ///发送
if(strcmp(sendbuf,"exit\n")==)
break;
recv(sock_cli, recvbuf, sizeof(recvbuf),); ///接收
fputs(recvbuf, stdout); memset(sendbuf, , sizeof(sendbuf));
memset(recvbuf, , sizeof(recvbuf));
} close(sock_cli);
return ;
}