UNIX环境高级编程——TCP/IP网络编程

//select_server1.c

#include <stdio.h>  
#include <string.h>  
#include <stdlib.h>  
#include <sys/types.h>          /* See NOTES */  
#include <sys/time.h>  
#include <unistd.h>  
#include <sys/select.h>  
#include <sys/socket.h>  
#include <errno.h>  
#include <strings.h>  
#include <netinet/in.h>  
#include <arpa/inet.h>  
      
#define N 64   
typedef struct sockaddr SA;  
      
int main(int argc, char *argv[])  
{  
    int listenfd, connfd, maxfd, i;  
    struct sockaddr_in servaddr, peeraddr;  
    socklen_t len;  
    char buf[N] = {0};  
    fd_set rdfs, bakrdfs;  
    ssize_t n;  
      
    if (argc < 3)  
    {  
        fprintf(stdout, "usage:%s <ip> <port>n", argv[0]);  
        exit(0);  
    }  
      
    bzero(&servaddr, sizeof(servaddr));  
      
    if ((listenfd = socket(PF_INET, SOCK_STREAM, 0)) == -1)  
    {  
        perror("socket");  
        exit(-1);  
    }  
      
    servaddr.sin_family = PF_INET;  
    servaddr.sin_port = htons(atoi(argv[2]));  
    servaddr.sin_addr.s_addr = inet_addr(argv[1]);  
      
    if (bind(listenfd, (SA *)&servaddr, sizeof(servaddr)) == -1)    
    {         
        perror("bind");  
        exit(-1);  
    }  
      
    listen(listenfd, 5);  
    maxfd = listenfd;  
      
    FD_ZERO(&bakrdfs);  
    FD_SET(listenfd, &bakrdfs);  
      
    len = sizeof(peeraddr);  
    while (1)  
    {  
        rdfs = bakrdfs;  
      
        if (select(maxfd+1, &rdfs, NULL, NULL, NULL) == -1)  
        {  
            perror("select");  
            exit(-1);  
        }  
      
        for (i = 0; i <= maxfd; i++)  
        {  
            if (FD_ISSET(i, &rdfs))  
            {  
                if (i == listenfd)  
                {  
                    if ((connfd = accept(i, (SA *)&peeraddr, &len)) == -1)  
                    {  
                        perror("accept");  
                        exit(-1);  
                    }  
                    fprintf(stdout, "welcome %s %dn",   
                            inet_ntoa(peeraddr.sin_addr),   
                            ntohs(peeraddr.sin_port));  
      
                    FD_SET(connfd, &bakrdfs);  
                    maxfd = (maxfd > connfd) ? maxfd : connfd;  
                }  
                else
                {  
                    bzero(buf, sizeof(buf));  
                    if ((n = recv(i, buf, N, 0)) == 0)  
                    {  
                        close(i);  
                        FD_CLR(i, &bakrdfs);  
                    }  
                    else
                    {  
                        printf("n=%d %sn", n, buf);  
                        send(i, buf, N, 0);  
                    }  
                }  
            }  
        }  
    }  
      
    exit(0);  
}

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