select 学习笔记

淩亂°似流年 2022-09-18 09:59 81阅读 0赞

写了一个 select 的server + client 在linux 上跑ok

\#include<sys/types.h>

\#include<sys/socket.h>

\#include<stdio.h>

\#include<netinet/in.h>

\#include<sys/time.h>

\#include<sys/ioctl.h>

\#include<unistd.h>

\#include<stdlib.h>

int main()

int server\_sockfd,client\_sockfd;

int server\_len,client\_len;

struct sockaddr\_in server\_address;

struct sockaddr\_in client\_address;

int result;

fd\_set readfds, testfds;

//  client\_len=sizeof(client\_address);

server\_sockfd=socket(AF\_INET,SOCK\_STREAM,0);

server\_address.sin\_family=AF\_INET;

server\_address.sin\_addr.s\_addr=htonl(INADDR\_ANY);

server\_address.sin\_port=htons(9734);

server\_len=sizeof(server\_address);

bind(server\_sockfd,(struct sockaddr \*)&server\_address,server\_len);

listen(server\_sockfd,5);

FD\_ZERO(&readfds);

FD\_SET(server\_sockfd,&readfds);

while(1)

char ch;

int fd;

int nread;

testfds=readfds;

printf("serverwaiting\\n");

result=select(FD\_SETSIZE,&testfds,(fd\_set \*)0,(fd\_set \*)0,(struct timeval \*)0);

if(result<1)\{

perror("server5");

exit(1);

for(fd=0;fd<FD\_SETSIZE;fd++)\{

if(FD\_ISSET(fd,&testfds))

if(fd==server\_sockfd)

client\_len=sizeof(client\_address);

client\_sockfd=accept(server\_sockfd,(struct sockaddr\*)&client\_address,&client\_len);

FD\_SET(client\_sockfd,&readfds);

printf("addingclient on fd %d\\n",client\_sockfd);

\}//end of if

else

ioctl(fd,FIONREAD,&nread);

if(nread==0)

close(fd);

FD\_CLR(fd,&readfds);

printf("removing client on fd %d\\n",fd);

else

read(fd,&ch,1);

sleep(5);

printf("serving client on fd %d\\n",fd);

ch++;

write(fd,&ch,1);

\}//end of else

\}//if fd is active deal with it

\}//looping all the possible value to check

\}//while loop of server

\}//end

\#include<sys/types.h>

\#include<sys/socket.h>

\#include<stdio.h>

\#include<netinet/in.h>

\#include<arpa/inet.h>

\#include<unistd.h>

\#include<stdlib.h>

int main()

int sockfd;

int len;

struct sockaddr\_in address;

int result;

char ch='A';

sockfd=socket(AF\_INET,SOCK\_STREAM,0);

address.sin\_family=AF\_INET;

address.sin\_addr.s\_addr=inet\_addr("127.0.0.1");

address.sin\_port=htons(9734);

len=sizeof(address);

result=connect(sockfd,(struct sockaddr \*)&address,len);

if(result==-1)

perror("oops:client2");

exit(1);

write(sockfd,&ch,1);

read(sockfd,&ch,1);

printf("char from server=%c\\n",ch);

close(sockfd);

exit(0);

//end

select 学习笔记

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