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1 recvfromÔÚ½ÓÊÕʱ£¬Ìṩ¸øϵͳµ÷ÓõÄ×îºóÒ»¸ö²ÎÊý£¬¿Í»§¶ËµÄµØÖ·½á¹¹£¬Æ䳤¶È±ØÐë½øÐгõʼ»¯£¬Èç¹ûΪ0£¬Ôò²»ÄܽÓÊÕÊý¾Ý¡£
2 selectµÄµÚÒ»¸ö²ÎÊýΪËùÓмàÊÓµÄÎļþÃèÊö·ûµÄ×î´óÖµ+1£¬¶ø²»ÊǼàÊÓµÄÎļþÃèÊö·û¸öÊý+1¡£
3 ²»Òª¼àÊÓÄÇЩ¾­³£¿ÉÓõÄÎļþÃèÊö·û£¬Èç¹ûÕâÑù×ö£¬select»áÒ»Ö±·µ»Ø¡£
4 ÔÚselect·µ»Øºó£¬Èç¹û¼àÊÓµÄÎļþÃèÊö·ûûÓÐ״̬¸Ä±ä£¬ÔòÔÚfd_setÖдËÎļþÃèÊö·û»á±»Çå0£¬Òò´ËÔÚselectµÄÑ­»·ÖУ¬Ã¿´Î½øÈ붼ҪÖØÐÂÉèÖÃÎÒÃÇËù¹Ø×¢µÄÎļþÃèÊö·û¡£
5 Èç¹ûselectʹÓÃÁ˳¬Ê±²Ù×÷£¬Ã¿´Î·µ»Øselect¶¼»áÐ޸ļÆʱÆ÷£¬½«¼ÆʱÆ÷ÉèΪÓàϵÄʱ¼ä£¬Òò´ËÈç¹ûʹÓÃÁ˼ÆʱÆ÷£¬Ã¿´Î½øÈëÑ­»·¶¼ÒªÖØÖüÆʱÆ÷¡£pselectûÓÐÕâ¸ö벡¡£
ÏÂÃæÊÇlinuxϵĻùÓÚselectµÄÒ»¸öUDP·´Éä·þÎñÆ÷µÄʾÀý´úÂ룺
 #include <sys/select.h>
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdio.h>
#include <error.h>
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <assert.h>
int
main()
{
int sockfd = socket(AF_INET,SOCK_DGRAM,0);
assert(sockfd>0);

struct sockaddr_in local;
local.sin_family = AF_INET;
local.sin_port = htons(8000);
local.sin_addr.s_addr = INADDR_ANY;
int err = bind(sockfd,(struct sockaddr*)&local,sizeof(local));
assert(err==0);
fd_set sets[3];
for(int i=0;i<3;i++)
{
FD_ZERO(&sets[i]);
}

timeval tv;
char buf[1024];
while(1)
{

FD_SET(sockfd,&sets[0]);

//register
tv.tv_sec = 1;
//monitor and handle
int nfds = select(sockfd+1,&sets[0],&sets[1],&sets[2],&tv);
if(nfds<0)
{
perror("select");
exit(-1);
}
printf("evnet num = %d\n",nfds);
//handle
for(int i=0;i<nfds;i++)
{
struct sockaddr_in remo


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