{"id":146,"date":"2009-11-15T21:36:24","date_gmt":"2009-11-15T21:36:24","guid":{"rendered":"http:\/\/kumouse.aafox.com\/?p=146"},"modified":"2009-11-15T21:36:24","modified_gmt":"2009-11-15T21:36:24","slug":"io-%e5%a4%9a%e8%b7%af%e9%80%89%e6%8b%a9%e7%a4%ba%e4%be%8b-select","status":"publish","type":"post","link":"https:\/\/www.kumouse.com\/?p=146","title":{"rendered":"I\/O \u591a\u8def\u9009\u62e9\u793a\u4f8b (select)"},"content":{"rendered":"

\u4e66\u4e2d\u81ea\u6709\u8a00\u5982\u7389\u5440\uff0cselect\u51fd\u6570\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u6211\u5728\u4e2d\u95f4\u52a0\u5165\u4e86\u4e00\u4e9bprintf\u8bed\u8a00\uff0c\u66f4\u65b9\u4fbf\u7406\u89e3\u7a0b\u5e8f\u7684\u6d41\u7a0b
\u5ba2\u6237\u7aef\u7528\u4e4b\u524d\u7684TCP\u4f8b\u5b50\u5c31\u884c\u4e86,\u89c1http:\/\/www.kumouse.com\/article.asp?id=141<\/a><\/p>\n

[ssj@main test]$ cat selectserver.c
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <sys\/socket.h>
#include <netinet\/in.h>
#include <arpa\/inet.h>
#include <stdlib.h>
#include <errno.h><\/p>\n

#define MAX 80<\/p>\n

int port=65533;<\/p>\n

void my_turn(char *p)
{sleep(5);
if (p == NULL)return;
while( *p != '\u0000')
{
if( *p >= (char)0x61 && *p <= (char)0x7a)
*p=(char)((int)*p-(int)0x20);
p++;
}
}<\/p>\n

int main(void)
{
struct sockaddr_in sin,cin;
int lfd,cfd,sfd,rdy,client[FD_SETSIZE],maxi,maxfd;
fd_set rset,allset;
socklen_t addr_len;
char buf[MAX],str[INET_ADDRSTRLEN];
int i,n,len,opt=1;<\/p>\n

bzero(&sin,sizeof(sin));
sin.sin_family=AF_INET;
sin.sin_addr.s_addr=INADDR_ANY;
sin.sin_port=htons(port);<\/p>\n

lfd=socket(AF_INET,SOCK_STREAM,0);
if(lfd==-1)
{perror("Fail to socket");exit(1); }<\/p>\n

setsockopt(lfd,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));<\/p>\n

if((n=bind(lfd,(struct sockaddr *)&sin,sizeof(sin)))==-1)
{perror("Fail to bind");exit(1);}<\/p>\n

if((n=listen(lfd,20))==-1)
{perror("Fail to listen");exit(1);}<\/p>\n

printf("running….n");<\/p>\n

maxfd=lfd;
maxi=-1;<\/p>\n

for(i=0;i<FD_SETSIZE;i++)
{client[i]=-1;}<\/p>\n

FD_ZERO(&allset);
FD_SET(lfd,&allset);<\/p>\n

while(1){
rset=allset;
rdy=select(maxfd+1,&rset,NULL,NULL,NULL);
printf("%dn",rdy);
if(FD_ISSET(lfd,&rset)){
printf("p1n");
addr_len=sizeof(sin);
if((cfd=accept(lfd,(struct sockaddr *)&cin,&addr_len))==-1)
{perror("Fail to accept");exit(1);}<\/p>\n

for(i=0;i<FD_SETSIZE;i++)
if(client[i]<0){client[i]=cfd;break;}<\/p>\n

if(i==FD_SETSIZE){printf("too many clientsn");exit(1);}<\/p>\n

FD_SET(cfd,&allset);<\/p>\n

if(cfd>maxfd)
maxfd=cfd;
if(i>maxi)
maxi=i;
if(–rdy<=0)
continue;
}<\/p>\n

for(i=0;i<=maxi;i++){
if((sfd=client[i])<0)continue;<\/p>\n

if(FD_ISSET(sfd,&rset)){
if((n=read(sfd,buf,MAX))==0){
printf("the other side has been close.n");
fflush(stdout);
close(sfd);
FD_CLR(sfd,&allset);
client[i]=-1;
}
else{
inet_ntop(AF_INET,&cin.sin_addr,str,sizeof(str));
printf("client IP:%s:%dn",str,ntohs(cin.sin_port));
my_turn(buf);
if((n=write(sfd,buf,n))==-1)exit(1);
}
if(–rdy<=0)break;
}
}
}
close(lfd);
return 0;
}<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"

\u4e66\u4e2d\u81ea\u6709\u8a00\u5982\u7389\u5440\uff0cselect\u51fd\u6570\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u6211\u5728\u4e2d\u95f4\u52a0\u5165\u4e86\u4e00\u4e9bprintf\u8bed\u8a00\uff0c\u66f4\u65b9\u4fbf\u7406\u89e3\u7a0b\u5e8f\u7684\u6d41\u7a0b\u5ba2\u6237\u7aef\u7528 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-146","post","type-post","status-publish","format-standard","hentry","category-linux-c"],"_links":{"self":[{"href":"https:\/\/www.kumouse.com\/index.php?rest_route=\/wp\/v2\/posts\/146","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kumouse.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kumouse.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kumouse.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kumouse.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=146"}],"version-history":[{"count":0,"href":"https:\/\/www.kumouse.com\/index.php?rest_route=\/wp\/v2\/posts\/146\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.kumouse.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=146"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kumouse.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=146"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kumouse.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}