多客户模式

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#include <sys/types.h> #include <sys/time.h> #include <stdio.h> #include <stdlib.h> #include <sys/ioctl.h> #include <fcntl.h> #include <unistd.h> #include <sys/socket.h> #include <netinet/in.h>   int main(int argc, char const *argv[]) {     int server_sockfd, client_sockfd;     int server_len, client_len;     struct sockaddr_in server_address;     struct sockaddr_in client_address;     int result;     fd_set readfds,testfds;       // create a socket for server and name it     server_sockfd=socket(AF_INET,SOCK_STREAM,0);       server_address.sin_family=AF_INET;     server_address.sin_addr.s_addr=htonl(INADDR_ANY);     server_address.sin_port=htons(9734);     server_len=sizeof(server_address);       //bind the socket and address     bind(server_sockfd,(struct sockaddr*)&server_address,server_len);       listen(server_sockfd,5);       FD_ZERO(&readfds);     FD_SET(server_sockfd,&readfds);       while(1){         char ch;         int fd;         int nread;           testfds=readfds;         printf("server waiting...\n");           result=select(FD_SETSIZE,&testfds,(fd_set*)NULL,(fd_set*)NULL,(struct timeval*)0);           if(result<1){             perror("server5...");             exit(1);         }           for(fd=0;fd<FD_SETSIZE;fd++){             if(FD_ISSET(fd,&testfds)){                 if(fd==server_sockfd){                     client_len=sizeof(client_address);                     client_sockfd=accept(server_sockfd,(struct sockaddr*)&client_address,&client_len);                     FD_SET(client_sockfd,&readfds);                     printf("adding client on fd %d\n", client_sockfd );                 }else{                     ioctl(fd,FIONREAD,&nread);                       if(nread==0){                         close(fd);                         FD_CLR(fd,&readfds);                         printf("removing client on fd %d\n",fd );                     }else{                         read(fd,&ch,1);                         sleep(3);                         printf("server client on fd %d\n",fd );                         ch++;                         write(fd,&ch,1);                     }                 }             }         }     }       return 0; }

　　

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本文转自被遗忘的博客园博客，原文链接：http://www.cnblogs.com/rollenholt/archive/2012/07/10/2584778.html，如需转载请自行联系原作者