Linux下的Socket基礎編程(2)

#include <netinet/in.h>#include <string.h>#include <arpa/inet.h># include <sys/types.h>#include <sys/types.h>#include <sys/socket.h>#include <unistd.h>#include <stdio.h>#include <stdlib.h>#define BIND_PORT 9999#define BUFFSZ 4096int main(int argc, char * argv[]){//extern int socket (int __domain, int __type, int __protocol)//sockaddr_in 代表一個網路地址。這裡定義一個socaddr_in的伺服器端地址struct sockaddr_in server_addr;//清零bzero(&server_addr, sizeof(server_addr));//伺服器端使用的連接埠server_addr.sin_port = htons(BIND_PORT);//伺服器端使用的協議家族server_addr.sin_family = AF_INET;//伺服器端使用的地址，INADDR_ANY表示由系統自己分配原生IP地址server_addr.sin_addr.s_addr = htons(INADDR_ANY);//建立一個伺服器的socketint server_socket = socket(PF_INET, SOCK_STREAM, 0);if ( server_socket < 0){perror("Create server socket error!");exit(1);}//建立成功後綁定if ( bind(server_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1 ){perror("bind socket error!");exit(1);}//綁定成功後開始監聽if ( listen(server_socket, 10) == -1){perror("listen socket error!");exit(1);}while(1){//extern int accept (int __fd, __SOCKADDR_ARG __addr, socklen_t *__restrict __addr_len);//定義一個用戶端的地址資訊結構體struct sockaddr_in client_addr;//清零bzero(&client_addr, sizeof(client_addr));//擷取結構體的大小socklen_t length = sizeof(client_addr);//accept 接受一個請求，成功後返回該socket的fd,並儲存用戶端的地址資訊int communicate_socket;if ( (communicate_socket = accept(server_socket, (struct sockaddr *)(&client_addr), &length)) < 0 ){perror("accept error!");exit(1);}char msg[BUFFSZ];bzero(msg, BUFFSZ);sprintf(msg, "Hello, I'm Server on Yangzhiyong-Linux\n");//發送資訊到用戶端write(communicate_socket, msg, sizeof(msg));//幹完事就關閉該次的串連close(communicate_socket);}return EXIT_SUCCESS;}

Client:

#include <netinet/in.h>#include <string.h>#include <arpa/inet.h># include <sys/types.h>#include <sys/types.h>#include <sys/socket.h>#include <unistd.h>#include <stdio.h>#include <stdlib.h>#define BIND_PORT 9999#define BUFFSZ 4096#define SERVER_IP "127.0.0.1"int main(int argc, char * argv[]) {//extern int socket (int __domain, int __type, int __protocol)struct sockaddr_in server_addr;struct sockaddr_in communite_addr;bzero(&server_addr, sizeof(server_addr));bzero(&communite_addr, sizeof(communite_addr));server_addr.sin_port = htons(BIND_PORT);server_addr.sin_family = AF_INET;server_addr.sin_addr.s_addr = inet_addr(SERVER_IP);//建立一個用於通訊的socketint communicate_socket = socket(PF_INET, SOCK_STREAM, 0);if (communicate_socket < 0) {perror("Create communicate_socket error!");exit(1);}//extern int connect (int __fd, __CONST_SOCKADDR_ARG __addr, socklen_t __len)//串連到伺服器，第一個參數是一個socket對象，用於該次的通訊通道，第二個參數是伺服器的地址資訊，第三個參數是該地址資訊的大小if (connect(communicate_socket, (struct sockaddr *)(&server_addr), sizeof(server_addr)) == -1) {perror("connect to server error!");exit(1);}int readLen = 0;char revMsg[BUFFSZ];bzero(revMsg, BUFFSZ);//讀取伺服器發過來的資訊if ((readLen = read(communicate_socket, revMsg, BUFFSZ)) == -1) {perror("read msg error!");exit(1);}revMsg[readLen] = '\0';printf("%s\n", revMsg);close(communicate_socket);return EXIT_SUCCESS;}