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#include <sys/select.h>
#include <sys/time.h>
#include
<sys/types.h>
#include <unistd.h>
int select(int
nfds,fd_set *readfds,fd_set *writefds, fd_set *except fds,struct timeval
*timeout)
void FD_SET(int fd,fd_set *fdset)
void FD_CLR(int fd,fd_set
*fdset)
void FD_ZERO(fd_set *fdset)
int FD_ISSET(int fd,fd_set
*fdset)
¼ÌÐøÇ°ÃæµÄ
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£¬½Ó׎²¹ØÓÚ¿Í»§¶ËÓë·þÎñÆ÷¶ËµÄÒ첽ͨѶ
Ò»°ãµÄÀ´Ëµµ±ÎÒÃÇÔÚÏòÎļþ¶Áдʱ,½ø³ÌÓпÉÄÜÔÚ¶Áд³ö×èÈû,Ö±µ½Ò»¶¨µÄÌõ¼þÂú×ã.
±ÈÈçÎÒÃÇ´ÓÒ»¸öÌ×½Ó×Ö¶ÁÊý¾Ýʱ,
¿ÉÄÜ»º³åÇøÀïÃæÃ»ÓÐÊý¾Ý¿É¶Á (ͨÐŵĶԷ½»¹Ã»ÓÐ
·¢ËÍÊý¾Ý¹ýÀ´),Õâ¸öʱºòÎÒÃǵĶÁµ÷ÓþͻáµÈ´ý(×èÈû)Ö±µ½ÓÐÊý¾Ý¿É¶Á.
Èç¹ûÎÒÃDz» Ï£Íû×èÈû,ÎÒÃǵÄÒ»¸öÑ¡ÔñÊÇÓÃselectϵͳµ÷ÓÃ.
Ö»ÒªÎÒÃÇÉèÖúÃselectµÄ¸÷¸ö²ÎÊý,
ÄÇôµ±Îļþ¿ÉÒÔ¶ÁдµÄʱºòselect»Ø"֪ͨ"ÎÒÃÇ Ëµ¿ÉÒÔ¶ÁдÁË.
       
readfdsËùÓÐÒª¶ÁµÄÎļþÎļþÃèÊö·ûµÄ¼¯ºÏ
        writefdsËùÓÐÒªµÄдÎļþÎļþÃèÊö·ûµÄ¼¯ºÏ
       
exceptfdsÆäËûµÄ·þÒªÏòÎÒÃÇ֪ͨµÄÎļþÃèÊö·û
        timeout³¬Ê±ÉèÖÃ.
       
nfdsËùÓÐÎÒÃÇ¼à¿ØµÄÎļþÃèÊö·ûÖÐ×î´óµÄÄÇÒ»¸ö¼Ó1
ÔÚÎÒÃǵ÷ÓÃselectʱ½ø³Ì»áÒ»Ö±×èÈûÖ±µ½ÒÔϵÄÒ»ÖÖÇé¿ö·¢Éú.
       
1)ÓÐÎļþ¿ÉÒÔ¶Á.
        2)ÓÐÎļþ¿ÉÒÔд.
        3)³¬Ê±ËùÉèÖõÄʱ¼äµ½.
ΪÁËÉèÖÃÎļþÃèÊö·ûÎÒÃÇҪʹÓü¸¸öºê.
        FD_SET½«fd¼ÓÈëµ½fdset
       
FD_CLR½«fd´ÓfdsetÀïÃæÇå³ý
        FD_ZERO´ÓfdsetÖÐÇå³ýËùÓеÄÎļþÃèÊö·û
       
FD_ISSETÅжÏfdÊÇ·ñÔÚfdset¼¯ºÏÖÐ
ʹÓÃselectµÄÒ»¸öÀý×Ó
#
include
<
stdio.
h>
    #
include
<
sys/
time
.
h>
    #
include
<
sys/
types.
h>
    #
include
<
unistd.
h>
    int
main(
void
)
    {
     


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spawn ftp [lindex $argv 0]
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send "ftp\r"
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