简单的linux下socket编程,分别基于TCP协议实现的简单程序
linux下socket编程可以概括为以下几个函数的运用:
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socket()
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bind()
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listen()
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connect()
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accept()
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read()
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write()
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close()函数
server端
/* * socket简单编程 服务端 */ #include <stdio.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <unistd.h> #define BUFFSIZE 1024 int main(int argc, char *argv[]) { int server_sockfd = 0; int client_sockfd = 0; int len = 0; int sin_size = 0; struct sockaddr_in server_addr; struct sockaddr_in client_addr; char buf[BUFFSIZE] = {0}; bzero(&server_addr, sizeof(server_addr)); server_addr.sin_family = AF_INET; server_addr.sin_addr.s_addr = INADDR_ANY; server_addr.sin_port = htons(8000); if((server_sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { perror("socket error!\n"); return -1; } if(bind(server_sockfd, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) < 0) { perror("bind error!\n"); return -1; } if(listen(server_sockfd, 5) < 0) { perror("listen error!\n"); return -1; } sin_size= sizeof(struct sockaddr_in); if((client_sockfd = accept(server_sockfd, (struct sockaddr *)&client_addr, &sin_size)) < 0) { perror("accept error!\n"); return -1; } printf("accept client %s\n",inet_ntoa(client_addr.sin_addr)); len = send(client_sockfd, "Hello word!\n",30,0); while((len = recv(client_sockfd, buf, BUFFSIZE, 0)) >0) { buf[len] = '\0'; printf("buf = %s\n",buf); if(send(client_sockfd, buf, len, 0) < 0) { perror("send error!\n"); return -1; } } close(client_sockfd); close(server_sockfd); return 0; }
client端
/* * socket简单编程 客户端 */ #include <stdio.h> #include <string.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <unistd.h> #define BUFFSIZE 1024 int main(int argc, char *argv[]) { int client_sockfd = 0; int len = 0; struct sockaddr_in server_addr; char buf[BUFFSIZE] = {0}; bzero(&server_addr, sizeof(struct sockaddr_in)); server_addr.sin_family = AF_INET; server_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); server_addr.sin_port = htons(8000); if((client_sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { perror("socket error!\n"); return -1; } if(connect(client_sockfd, (struct sockaddr*)&server_addr, sizeof(struct sockaddr)) < 0) { perror("client error!\n"); return -1; } printf("connect success!\n"); len = recv(client_sockfd, buf, BUFFSIZE, 0); buf[len] = '\0'; printf("client_buf = %s\n",buf); while(1) { printf("Enter string to send:"); scanf("%s",buf); if(!strcmp(buf,"quit")) { break; } len = send(client_sockfd, buf, strlen(buf), 0); len = recv(client_sockfd, buf, BUFFSIZE, 0); buf[len] = '\0'; printf("received: %s\n",buf); } close(client_sockfd); return 0; }