怎么使用linux socket實(shí)現(xiàn)服務(wù)器和客戶端對(duì)話

1.服務(wù)器端 #include <sys/types.h> #include <sys/socket.h> #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <string.h> #include <unistd.h> #include <netinet/in.h> #define SERVPORT 3333 #define BACKLOG 10 #define MAX_CONNECTED_NO 10 #define MAXDATASIZE 5  int main() {   struct sockaddr_in server_sockaddr,client_sockaddr;   int sin_size,recvbytes;   int sockfd,client_fd;   char buf[MAXDATASIZE]; /*創(chuàng)建socket*/   if((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1){     perror("socket");     exit(1);   }   printf("socket success!,sockfd=%dn",sockfd); /*設(shè)置服務(wù)器sockaddr_in結(jié)構(gòu)*/   server_sockaddr.sin_family=AF_INET;   server_sockaddr.sin_port=htons(SERVPORT);   server_sockaddr.sin_addr.s_addr=INADDR_ANY;   bzero(&(server_sockaddr.sin_zero),8); /*綁定socket和端口*/   if(bind(sockfd,(struct sockaddr *)&server_sockaddr,sizeof(struct sockaddr))==-1){     perror("bind");     exit(1);   }   printf("bind success!n"); /*監(jiān)聽客戶端請(qǐng)求*/   if(listen(sockfd,BACKLOG)==-1){     perror("listen");     exit(1);   }   printf("listening....n"); /*接受客戶端請(qǐng)求*/   if((client_fd=accept(sockfd,(struct sockaddr *)&client_sockaddr,&sin_size))==-1){     perror("accept");     exit(1);   } /*接收客戶端信息*/   if((recvbytes=recv(client_fd,buf,MAXDATASIZE,0))==-1){     perror("recv");     exit(1);   }   printf("received a connection :%sn",buf); /*關(guān)閉socket*/   close(sockfd); } 2.客戶端 #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <string.h> #include <netdb.h> #include <sys/types.h> #include <netinet/in.h> #include <sys/socket.h> #define SERVPORT 3333 #define MAXDATASIZE 100 main(int argc,char *argv[]){   int sockfd,sendbytes;   char buf[MAXDATASIZE];   struct hostent *host;   struct sockaddr_in serv_addr; /*argc<2,表示沒有輸入主機(jī)名，主機(jī)句是IP地址形式，如“192.168.1.1”*/   if(argc < 2){     fprintf(stderr,"Please enter the server's hostname!n");     exit(1);   } /*獲取主機(jī)名，地址解析函數(shù)*/   if((host=gethostbyname(argv[1]))==NULL){     perror("gethostbyname");     exit(1);   } /*創(chuàng)建socket*/   if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1){     perror("socket");     exit(1);   } /*設(shè)置serv_addr結(jié)構(gòu)參數(shù)*/   serv_addr.sin_family=AF_INET;   serv_addr.sin_port=htons(SERVPORT);   serv_addr.sin_addr=*((struct in_addr *)host->h_addr);   bzero(&(serv_addr.sin_zero),8); /*向服務(wù)器請(qǐng)求連接，serv_addr是服務(wù)器端地址*/   if(connect(sockfd,(struct sockaddr *)&serv_addr,     sizeof(struct sockaddr))==-1){     perror("connect");     exit(1);   } /*發(fā)送消息給服務(wù)器，此時(shí)可以在服務(wù)器端看到"hello"字樣*/   if((sendbytes=send(sockfd,"hello",5,0))==-1){     perror("send");     exit(1);   } /*關(guān)閉連接*/   close(sockfd); }

#gcc server.c -o server #./server                       //此時(shí)服務(wù)器端在監(jiān)聽 #gcc client.c -o client #./client 172.31.100.236        //客戶端向服務(wù)器端發(fā)送“hello"，服務(wù)器端監(jiān)聽終止