1 /* interactionSocket/client.c 2  *                 实现终端与服务器端的交互式输入输出 3  */ 4 #include <stdio.h> 5 #include <stdlib.h> 6 #include <string.h>  7 #include <unistd.h> 8 #include <sys/types.h>  9 #include <sys/socket.h>10 #include <netinet/in.h>11 #include <netdb.h>12 13 #define MAXLINE 8014 #define PORTNUM 1234515 16 int main(void) {17   int sock, len;18   struct sockaddr_in saddr;19   struct hostent *hp;20   char buf[MAXLINE];21   char request[MAXLINE];22   char hostname[BUFSIZ];23 24   sock=socket(AF_INET, SOCK_STREAM, 0);25   if(sock==-1) exit(-1);26   27   bzero((void*)&saddr, sizeof(saddr));28   //inet_pton(AF_INET, "127.0.0.1", (void*)&saddr.sin_addr);29   gethostname(hostname, BUFSIZ);30   hp=gethostbyname(hostname);31   bcopy(hp->h_addr, (void*)&saddr.sin_addr, hp->h_length);32   saddr.sin_port=htons(PORTNUM);33   saddr.sin_family=AF_INET;34   35   connect(sock, (struct sockaddr *)&saddr, sizeof(saddr));36   while( fgets(buf, MAXLINE, stdin)!=NULL) {37     write(sock, buf, strlen(buf));38     len=read(sock, buf, MAXLINE);39     if(len==0)40       printf("the other side has been closed");41     else 42       write(STDOUT_FILENO, buf, len);43   }44   close(sock);45   return 1;46 }

 1 /* interaction/server.c 2  */ 3 #include <stdio.h> 4 #include <stdlib.h> 5 #include <netinet/in.h> 6 #include <sys/types.h> 7 #include <sys/socket.h> 8 #include <string.h> 9 #include <netdb.h>10 11 #define MAXLINE 8012 #define SERV_PORT 1234513 #define BACKLOG 2014 int main(void ) {15   int sock, connfd;16   struct sockaddr_in saddr, cliaddr;17   struct hostent *hp;18   socklen_t cliaddr_len;19   char buf[MAXLINE];20   char str[MAXLINE];21   char hostname[BUFSIZ];22   int i, n;23   24   sock=socket(PF_INET, SOCK_STREAM, 0);25   if(sock==-1)26     exit(-1);27   bzero((void*)&saddr, sizeof(saddr));28   //saddr.sin_addr.s_addr=htonl(INADDR_ANY);29   gethostname(hostname, BUFSIZ);30   hp=gethostbyname(hostname);31   bcopy(hp->h_addr, (void*)&saddr.sin_addr, hp->h_length);32   saddr.sin_family=AF_INET;33   saddr.sin_port=htons(SERV_PORT);34   if(bind(sock, (struct sockaddr*)&saddr, sizeof(saddr))==-1)35     exit(-1);36   if(listen(sock, BACKLOG)==-1)37     exit(-1);38   printf("accepting connections...\n");39   while(1) {40     cliaddr_len=sizeof(cliaddr);41     connfd=accept(sock, (struct sockaddr*)&cliaddr, &cliaddr_len);42     while(1) {43       n=read(connfd, buf, MAXLINE);44       if(n==0){ 45     printf("the other side has been closed.\n");46     break;47       }48       //printf("received from %s at PORT %d\n", inet_ntop(AF_INET, &cliaddr.sin_addr, str, sizeof(str)), ntohs(cliaddr.sin_port));49       for(i=0; i<n; i++) 50     buf[i]=toupper(buf[i]);51       write(connfd, buf, n);52     }53     close(connfd);54   }55 }