www.pudn.com > 套接字socket编程文档.rar > aa.c, change:2001-08-20,size:2170b

/****************************************/ 
/*                                      */ 
/*      simple-client.c                 */ 
/*                                      */ 
/*      Alan Dix                        */ 
/*                                      */ 
/*      client for a simple 'talk'      */ 
/*      application with strict         */ 
/*      turn-taking                     */ 
/*                                      */ 
/*      15th January 1996               */ 
/*                                      */ 
/****************************************/ 
 
#include <stdio.h> 
#include <string.h> 
#include "sock.h" 
 
 
#define PORTNO  6789          /*  default port and host  */ 
#define HOST    "zeus" 
 
char *host = HOST; 
int   port = PORTNO; 
 
#define BUFF_LEN 200 
char buff[BUFF_LEN]; 
int buf_len = BUFF_LEN-1;     /*  allow room for terminating '\0'  */ 
 
char *progname; 
 
void failmess(char *mess) 
{ 
    fprintf( stderr, "%s: %s\n", progname, mess ); 
    exit(1); 
} 
 
main( int argc, char**argv ) 
{ 
    int  serv_sk, len; 
    char *errmess; 
 
    progname = argv[0]; 
 
    if ( parse_network_args( &argc, argv, &host, &port, &errmess ) != 0 ) 
        failmess(errmess); 
 
  /*  request connection to server  */ 
    serv_sk = tcp_active_open(host,port); 
        /*  waits for server to accept             */ 
        /*  returns negative result on failure     */ 
        /*  host is server誷 machine               */ 
    if ( serv_sk  0 ) { perror("socket"); exit(1); } 
    printf("You can send now\n"); 
  
/*  talk to server  */ 
    for(;;) { 
      /*  our turn first  */ 
        printf("speak: "); 
        if ( gets(buff) == NULL ) {    /* user typed end of file  */ 
            close(serv_sk); 
            printf("bye bye\n"); 
            break; 
            } 
        write(serv_sk,buff,strlen(buff)); 
 
      /*  wait for server誷 message  */ 
        len = read(serv_sk,buff,buf_len);  
        if (len == 0) { 
            printf("server finished the conversation\n"); 
            break; 
            } 
        buff[len] = '\0'; 
        printf("server says: %s\n",buff); 
    } 
    exit(0); 
}