1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #include ssize_t read(int fd, void *buf, size_t count); ssize_t write(int fd, const void *buf, size_t count); #include #include ssize_t send(int sockfd, const void *buf, size_t len, int flags); ssize_t recv(int sockfd, void *buf, size_t len, int flags); ssize_t sendto(int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen); ssize_t recvfrom(int sockfd, void *buf, size_t len, int flags, struct sockaddr *src_addr, socklen_t *addrlen); ssize_t sendmsg(int sockfd, const struct msghdr *msg, int flags); ssize_t recvmsg(int sockfd, struct msghdr *msg, int flags); |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | /* File Name: server.c */ #include #include #include #include #include #include #include #define DEFAULT_PORT 8000 #define MAXLINE 4096 int main(int argc, char** argv) { int socket_fd, connect_fd; struct sockaddr_in servaddr; char buff[4096]; int n; //初始化Socket if( (socket_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1 ){ printf("create socket error: %s(errno: %d)n",strerror(errno),errno); exit(0); } //初始化 memset(&servaddr, 0, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl(INADDR_ANY);//IP地址设置成INADDR_ANY,让系统自动获取本机的IP地址。 servaddr.sin_port = htons(DEFAULT_PORT);//设置的端口为DEFAULT_PORT //将本地地址绑定到所创建的套接字上 if( bind(socket_fd, (struct sockaddr*)&servaddr, sizeof(servaddr)) == -1){ printf("bind socket error: %s(errno: %d)n",strerror(errno),errno); exit(0); } //开始监听是否有客户端连接 if( listen(socket_fd, 10) == -1){ printf("listen socket error: %s(errno: %d)n",strerror(errno),errno); exit(0); } printf("======waiting for client's request======n"); while(1){ //阻塞直到有客户端连接,不然多浪费CPU资源。 if( (connect_fd = accept(socket_fd, (struct sockaddr*)NULL, NULL)) == -1){ printf("accept socket error: %s(errno: %d)",strerror(errno),errno); continue; } //接受客户端传过来的数据 n = recv(connect_fd, buff, MAXLINE, 0); //向客户端发送回应数据 if(!fork()){ /*紫禁城*/ if(send(connect_fd, "Hello,you are connected!n", 26,0) == -1) perror("send error"); close(connect_fd); exit(0); } buff[n] = '\0'; printf("recv msg from client: %sn", buff); close(connect_fd); } close(socket_fd); } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | /* File Name: client.c */ #include #include #include #include #include #include #include #define MAXLINE 4096 int main(int argc, char** argv) { int sockfd, n,rec_len; char recvline[4096], sendline[4096]; char buf[MAXLINE]; struct sockaddr_in servaddr; if( argc != 2){ printf("usage: ./client exit(0); } if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){ printf("create socket error: %s(errno: %d)n", strerror(errno),errno); exit(0); } memset(&servaddr, 0, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_port = htons(8000); if( inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0){ printf("inet_pton error for %sn",argv[1]); exit(0); } if( connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0){ printf("connect error: %s(errno: %d)n",strerror(errno),errno); exit(0); } printf("send msg to server: n"); fgets(sendline, 4096, stdin); if( send(sockfd, sendline, strlen(sendline), 0) < 0) { printf("send msg error: %s(errno: %d)n", strerror(errno), errno); exit(0); } if((rec_len = recv(sockfd, buf, MAXLINE,0)) == -1) { perror("recv error"); exit(1); } buf[rec_len] = '\0'; printf("Received : %s ",buf); close(sockfd); exit(0); } |
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