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#include <iostream>
#include <time.h>
#ifdef WIN32
#include <winsock2.h>
#pragma comment(lib,"ws2_32.lib")
#else
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif
using namespace std;
int  main()
{
        struct timeval timeWait;
        timeWait.tv_sec = 0;
        timeWait.tv_usec = 10000;
        int liRecvCnt = 0;
        time_t t1, t2;
        time(&t1);
         while(liRecvCnt < 10)
         {
                timeWait.tv_sec = 0;
                timeWait.tv_usec = 500000;
                liRecvCnt++;
                select(0, NULL, NULL, NULL, &timeWait);
        }
         time(&t2);
         cout<<t2-t1<<endl;
         return 0;
}
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sudo emacs  /etc/hosts
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64.147.188.86 www.xmark.com
64.147.188.92 api.xmarks.com
64.147.188.89 login.xmarks.com
64.147.188.87 sync.xmarks.com
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LinuxÆô¶¯¹ý³Ì£¨´ÓÖ´ÐÐinitµ½Óû§µÇ¼²¿·Ö£©

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1.¼ì²élinuxÊÇ·ñ´æÔÚsquidÀϰ汾... 3
2.Squid »ñÈ¡Óë°²×°... 3
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/*
×¢ÒâÒªºÍÄãµÄϵͳһÖÂredhatÊÇÕâÑù/etc/pam.d/check_user
auth required /lib/security/pam_unix_auth.so
account required /lib/security/pam_unix_acct.so
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/etc/security/console.apps/check_user
USER=root
PROGRAM=~/check_use ......
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