kqueue example

最新推荐文章于 2023-04-29 19:36:37 发布

最新推荐文章于 2023-04-29 19:36:37 发布 · 90 阅读

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#Socket

本文展示了一个使用KQueue实现的简单TCP服务器示例。该服务器监听8888端口，通过KQueue机制来处理客户端连接请求。当有新的客户端连接到达时，服务器将打印连接文件描述符。

#include<sys/types.h>
#include<netinet/in.h>
#include<sys/event.h>
#include<sys/time.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>
#include<stdio.h>

#defineerr(msg)perror(msg)
#defineSAstructsockaddr

structevent
{
intfd;
void(*handle)(structevent*);
};

staticinttcp_listen(void)
{
structsockaddr_inaddr;
intfd;

if((fd=socket(PF_INET,SOCK_STREAM,0))==-1)
{
err("socket");
return-1;
}

memset(&addr,'\0',sizeof(structsockaddr_in));
addr.sin_family=AF_INET;
addr.sin_port=htons(8888);
if(inet_pton(AF_INET,"0.0.0.0",&addr.sin_addr)<=0)
{
err("inet_pton");
gotoerr;
}

if(bind(fd,(SA*)&addr,sizeof(structsockaddr_in))==-1)
{
err("bind");
gotoerr;
}

if(listen(fd,10)==-1)
{
err("listen");
gotoerr;
}

returnfd;
err:
close(fd);
return-1;
}

staticvoidlisten_readable(structevent*e)
{
intconnfd;

connfd=accept(e->fd,NULL,NULL);
printf("connfd = %d\n",connfd);
close(connfd);
}

intmain(void)
{
intfd;
intkq;
intnfds;
structkevent ev,rev[2];

if((fd=tcp_listen())==-1)
{
err("tcp_listen");
return-1;
}

if((kq=kqueue())==-1)
{
err("kqueue");
gotoerr;
}

structevent e;

e.fd=fd;
e.handle=listen_readable;

EV_SET(&ev,fd,EVFILT_READ,EV_ADD,0,0,&e);

while(1)
{
nfds=kevent(kq,&ev,1,rev,2,NULL);
if(nfds<=0)
{
err("kevent");
gotokevent_err;
}

for(inti=0;i<nfds;i++)
{
structevent*re=rev[i].udata;
if(re)
re->handle(re);
}
}

return0;
kevent_err:
close(kq);
err:
close(fd);
return-1;
}