- /******* 服务器程序 (server.c) ************/
- #include <stdlib.h>
- #include <stdio.h>
- #include <errno.h>
- #include <string.h>
- #include <unistd.h>
- #include <netdb.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <sys/types.h>
- #include <arpa/inet.h>
- int main(int argc, char *argv[]) {
- int sockfd,new_fd;
- struct sockaddr_in server_addr;
- struct sockaddr_in client_addr;
- int sin_size,portnumber;
- char hello[]="Hello! Are You Fine?\\n";
- if(argc!=2)
- {
- fprintf(stderr,"Usage:%s portnumber\\a\\n",argv[0]);
- exit(1);
- }
- if((portnumber=atoi(argv[1]))<0)
- {
- fprintf(stderr,"Usage:%s portnumber\\a\\n",argv[0]);
- exit(1);
- }
- /* 服务器端开始建立socket描述符 */
- if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
- {
- fprintf(stderr,"Socket error:%s\\n\\a",strerror(errno));
- exit(1);
- }
- /* 服务器端填充 sockaddr结构 */
- zero(&server_addr,sizeof(struct sockaddr_in));
- server_addr.sin_family=AF_INET;
- server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
- server_addr.sin_port=htons(portnumber);
- /* 捆绑sockfd描述符 */
- if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
- {
- fprintf(stderr,"Bind error:%s\\n\\a",strerror(errno));
- exit(1);
- }
- /* 监听sockfd描述符 */
- if(listen(sockfd,5)==-1)
- {
- fprintf(stderr,"Listen error:%s\\n\\a",strerror(errno));
- exit(1);
- }
- while(1)
- {
- /* 服务器阻塞,直到客户程序建立连接 */
- sin_size=sizeof(struct sockaddr_in);
- if((new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size))==-1)
- {
- fprintf(stderr,"Accept error:%s\\n\\a",strerror(errno));
- exit(1);
- }
- fprintf(stderr,"Server get connection from %s\\n", inet_ntoa(client_addr.sin_addr));
- if(write(new_fd,hello,strlen(hello))==-1)//if(send(new_fd,hello,strlen(hello),0)==-1)
- {
- fprintf(stderr,"Write Error:%s\\n",strerror(errno));
- exit(1);
- }
- /* 这个通讯已经结束 */
- close(new_fd);
- /* 循环下一个 */
- }
- close(sockfd);
- exit(0);
- }
- /******* 客户端程序 client.c ************/
- #include <stdlib.h>
- #include <stdio.h>
- #include <errno.h>
- #include <string.h>
- #include <unistd.h>
- #include <netdb.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <sys/types.h>
- #include <arpa/inet.h>
- int main(int argc, char *argv[])
- {
- int sockfd;
- char buffer[1024];
- struct sockaddr_in server_addr;
- struct hostent *host;
- int portnumber,nbytes;
- if(argc!=3)
- {
- fprintf(stderr,"Usage:%s hostname portnumber\\a\\n",argv[0]);
- exit(1);
- }
- if((host=gethostbyname(argv[1]))==NULL)
- {
- fprintf(stderr,"Gethostname error\\n");
- exit(1);
- }
- if((portnumber=atoi(argv[2]))<0)
- {
- fprintf(stderr,"Usage:%s hostname portnumber\\a\\n",argv[0]);
- exit(1);
- }
- /* 客户程序开始建立 sockfd描述符 */
- if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
- {
- fprintf(stderr,"Socket Error:%s\\a\\n",strerror(errno));
- exit(1);
- }
- /* 客户程序填充服务端的资料*/
- bzero(&server_addr,sizeof(server_addr));
- server_addr.sin_family=AF_INET;
- server_addr.sin_port=htons(portnumber);
- server_addr.sin_addr=*((struct in_addr *)host->h_addr);
- /* 客户程序发起连接请求*/
- if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
- {
- fprintf(stderr,"Connect Error:%s\\a\\n",strerror(errno));
- exit(1);
- }
- /* 连接成功了*/
- if((nbytes=read(sockfd,buffer,1024))==-1) //if((nbytes=recv(sockfd,buffer,1024))==-1)
- {
- fprintf(stderr,"Read Error:%s\\n",strerror(errno));
- exit(1);
- }
- buffer[nbytes]='\\0';
- printf("I have received:%s\\n",buffer);
- /* 结束通讯 */
- close(sockfd);
- exit(0);
- }
- //该片段来自于http://www.codesnippet.cn/detail/2308201614960.html
来源: http://www.codesnippet.cn/detail/2308201614960.html