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#include "stdlib.h"
#include "stdio.h"
#include "errno.h"
#include "string.h"
#include "netdb.h"
#include "sys/types.h"
#include "sys/stat.h"
#include "fcntl.h"
#include "netinet/in.h"
#include "sys/socket.h"

void client(int ch)
{
        int i;
printf("%d",ch);
        switch(ch)
        {
        /********´«ÊäÎļþ******/
        case 1: _i = flushall();
                send();
                break;
        /********ÁÄÌì*********/
        case 2:
        /*********ȺÁÄ********/
        case 3: break;
        }
}
/********************************************************************************************
*ÎÒÔÚÁíÍâÒ»¸öº¯Êýµ÷ÓÃÁËclient º¯Êý£¬È»ºó´«¹ýÀ´Ò»¸öch£¬ÎÒÏëÔÚµ÷ÓÃ_send()º¯Êý֮ǰ,ÇåÀíÏ»º´æÇø£¬
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* 'flushall'µÄÍ·Îļþ²»ÊÇstdio.hÂð£¿ÎÒÒѾ­°üº¬ÁË¡£
*ΪʲôÌáʾÎÒÁ¬½Ó´íÎó°¢£¿
* undefined reference to `flushall'


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linux»·¾³ÏÂgethostbynameº¯ÊýÎÊÌâ - C/C++ / CÓïÑÔ

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  struct hostent *hp; 
char AlarmDevIP[20];  
  int x2;

hp = gethostbyname("www.google.com");
if (hp)
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