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      selectϵͳµ÷ÓÃÊÇÓÃÀ´ÈÃÎÒÃǵijÌÐò¼àÊÓ¶à¸öÎļþ¾ä±úµÄ״̬±ä»¯µÄ¡£³ÌÐò»áÍ£ÔÚselectÕâÀïµÈ´ý£¬Ö±µ½±»¼àÊÓµÄÎļþ¾ä±úÓÐÒ»¸ö»ò¶à¸ö·¢ÉúÁË״̬¸Ä±ä¡£¹ØÓÚÎļþ¾ä±ú£¬Æäʵ¾ÍÊÇÒ»¸öÕûÊý£¬ÎÒÃÇ×îÊìϤµÄ¾ä±úÊÇ0¡¢1¡¢2Èý¸ö£¬0ÊDZê×¼ÊäÈ룬1ÊDZê×¼Êä³ö£¬2ÊDZê×¼´íÎóÊä³ö¡£0¡¢1¡¢2ÊÇÕûÊý±íʾµÄ£¬¶ÔÓ¦µÄFILE *½á¹¹µÄ±íʾ¾ÍÊÇstdin¡¢stdout¡¢stderr¡£
      int select(int n,fd_set * readfds,fd_set * writefds,fd_set * exceptfds,struct timeval * timeout);²ÎÊýn´ú±íÎļþÃèÊö´Ê¼Ó1£»²ÎÊýreadfds¡¢writefds ºÍexceptfds ³ÆÎªÃèÊö´Ê×飬ÊÇÓÃÀ´»Ø´«¸ÃÃèÊö´ÊµÄ¶Á£¬Ð´»òÀýÍâµÄ×´¿ö¡£ÏÂÃæµÄºêÌṩÁË´¦ÀíÕâÈýÖÖÃèÊö´Ê×éµÄ·½Ê½:
FD_CLR(inr fd,fd_set* set)£»ÓÃÀ´Çå³ýÃèÊö´Ê×ésetÖÐÏà¹Øfd µÄλ
FD_ISSET(int fd,fd_set *set)£»ÓÃÀ´²âÊÔÃèÊö´Ê×ésetÖÐÏà¹Øfd µÄλÊÇ·ñÎªÕæ
FD_SET£¨int fd,fd_set*set£©£»ÓÃÀ´ÉèÖÃÃèÊö´Ê×ésetÖÐÏà¹ØfdµÄλ
FD_ZERO£¨fd_set *set£©£»ÓÃÀ´Çå³ýÃèÊö´Ê×ésetµÄÈ«²¿Î»
      ²ÎÊýtimeoutΪ½á¹¹timeval£¬ÓÃÀ´ÉèÖÃselect()µÄµÈ´ýʱ¼ä£¬Æä½á¹¹¶¨ÒåÈçÏ£º
struct timeval
{
       time_t tv_sec;
       time_t tv_usec;
};
Èç¹û²ÎÊýtimeoutÉèΪNULL£¬Ôò±íʾselect£¨£©Ã»ÓÐtimeout¡£
       selectº¯ÊýÖ´Ðнá¹û£ºÖ´Ðгɹ¦Ôò·µ»ØÎļþÃèÊö´Ê״̬ÒѸıäµÄ¸öÊý£¬Èç¹û·µ»Ø0´ú±íÔÚÃèÊö´Ê״̬¸Ä±äǰÒѳ¬¹ýtimeoutʱ¼ä£¬Ã»Óзµ»Ø£»µ±ÓдíÎó·¢ÉúʱÔò·µ»Ø-1£¬´íÎóÔ­Òò´æÓÚerrno£¬´Ëʱ²ÎÊýreadfds£¬writefds£¬exceptfdsºÍtimeoutµÄÖµ±ä³É²»¿ÉÔ¤²â¡£´íÎó
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fs_set readset£»
FD_ZERO(&readset);
FD_SET(fd,&readset);
select(fd+1,&readset,NULL,NULL,NULL);
if(FD_ISSET(fd,readset){……}
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#include<sys/time.h>
#include<sys/types.h>
#include<unistd.h>
#include<string.h>
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