#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <fcntl.h>
#include <sys/epoll.h>
#include <sys/time.h>
#include <sys/resource.h>
#define MAXBUF 1024
#define MAXEPOLLSIZE 10000
int kdpfd ;
int send_string(int) ;
/*
setnonblocking
*/
int setnonblocking(int sockfd)
{
if (fcntl(sockfd, F_SETFL, fcntl(sockfd, F_GETFD, 0)|O_NONBLOCK) == -1) {
return -1;
}
return 0;
}
/*
handle_message - handle every socket recv
*/
int handle_message(int new_fd)
{
char buf[MAXBUF + 1];
int len;
bzero(buf, MAXBUF + 1);
int clientdone = 0 ;
struct epoll_event event ;
while(1)
{
len = recv(new_fd, buf, MAXBUF, 0);
if(len < 0)
{
if(errno!= EAGAIN)
{
printf("recv error...\n") ;
clientdone = 1 ;
}
break ;
}else if(len==0)
{
clientdone = 1 ; //remote close connection
printf("remote close connection...\n") ;
break ;
}else{
printf("%d receive '%s' len=%d\n", new_fd, buf, len);
if(strncmp(buf,"zzzzz",5) != 0)
{
event.data.fd = new_fd ;
event.events = EPOLLOUT | EPOLLET;
int s ;
s = epoll_ctl(kdpfd , EPOLL_CTL_MOD, new_fd, &event);
if (s == -1) {
perror("epoll_ctl");
abort();
}
// .. header
clientdone = send_string(new_fd);
printf("send hello world \n") ;
}
}
}//while
return clientdone ;
/*
len = recv(new_fd, buf, MAXBUF, 0);
if (len > 0)
printf
("%d receive '%s' len=%d\n",
new_fd, buf, len);
else {
if (len < 0)
{
printf ("receive error,error=%d,'%s'\n", errno, strerror(errno));
}
close(new_fd);
return -1;
}
return len;
*/
} //handle_message
int send_string(int new_fd)
{
char strx[16] ;
memset(strx,0x00,sizeof(strx)) ;
strcpy(strx,"hello world\n") ;
send(new_fd, strx, strlen(strx), 0) ;
/*
while(1)
{
if( send(new_fd, strx, strlen(strx), 0) < 0 )
{
if (errno != EAGAIN)
{
perror("send in send_string error");
return 1 ;
}else
return 0 ;
}
}//while
*/
return 0 ;
}
/*********** about this file *************
*filename: epoll-server.c
*wrote by: zhoulifa(zhoulifa@163.com)(http://zhoulifa.bokee.com)
*date time:2007-01-31 21:00
*Thanks to:Google
*********************************************************************/
int main(int argc, char **argv)
{
int listener, new_fd, nfds, n, ret, curfds;
socklen_t len;
struct sockaddr_in my_addr, their_addr;
unsigned int myport, lisnum;
struct epoll_event ev;
struct epoll_event events[MAXEPOLLSIZE];
struct rlimit rt;
if (argv[1])
myport = atoi(argv[1]);
else
myport = 7838;
if (argv[2])
lisnum = atoi(argv[2]);
else
lisnum = 2;
/* config max fd in process */
rt.rlim_max = rt.rlim_cur = MAXEPOLLSIZE;
if (setrlimit(RLIMIT_NOFILE, &rt) == -1) {
perror("setrlimit");
exit(1);
}
else printf("resource config successfully \n");
if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
} else
printf("socket create successfully \n");
setnonblocking(listener);
bzero(&my_addr, sizeof(my_addr));
my_addr.sin_family = PF_INET;
my_addr.sin_port = htons(myport);
if (argv[3])
my_addr.sin_addr.s_addr = inet_addr(argv[3]);
else
my_addr.sin_addr.s_addr = INADDR_ANY;
int opt = 1;
setsockopt(listener , SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
if (bind
(listener, (struct sockaddr *) &my_addr, sizeof(struct sockaddr))
== -1) {
perror("bind");
exit(1);
} else
printf("IP bind successfully \n") ;
kdpfd = epoll_create(MAXEPOLLSIZE);
len = sizeof(struct sockaddr_in);
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = listener;
if (epoll_ctl(kdpfd, EPOLL_CTL_ADD, listener, &ev) < 0) {
fprintf(stderr, "epoll set insertion error: fd=%d\n", listener);
return -1;
} else
printf("watch socket to epoll successfully \n");
curfds = 1;
while (1)
{
/* wait something happen */
nfds = epoll_wait(kdpfd, events, curfds, -1);
if (nfds == -1) {
perror("epoll_wait");
break;
}
/* handle all events */
for (n = 0; n < nfds; ++n) {
if (events[n].data.fd == listener) {
while(1)
{
new_fd = accept(listener, (struct sockaddr *) &their_addr,
&len);
if (new_fd < 0) {
if((errno== EAGAIN)|| (errno== EWOULDBLOCK))
{
/* We have processed all incoming
connections. */
break;
}
else
{
perror("accept");
break;
}
} else{
printf("connect from (%s):(%d),socket:%d\n",
inet_ntoa(their_addr.sin_addr),
ntohs(their_addr.sin_port), new_fd);
}
setnonblocking(new_fd);
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = new_fd;
if (epoll_ctl(kdpfd, EPOLL_CTL_ADD, new_fd, &ev) < 0) {
fprintf(stderr, "put socket '%d'join epoll fail%s\n",
new_fd, strerror(errno));
return -1;
}
curfds++;
}//while
continue ;
} else {
if(events[n].events & EPOLLIN)
{
ret = handle_message(events[n].data.fd);
if(ret==1)
{
close(events[n].data.fd) ;
epoll_ctl(kdpfd, EPOLL_CTL_DEL, events[n].data.fd,&ev);
curfds--;
}
}
if(events[n].events & EPOLLOUT)
{
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = events[n].data.fd ;
if (epoll_ctl(kdpfd, EPOLL_CTL_MOD, events[n].data.fd, &ev) < 0) {
fprintf(stderr, "'%d' mod to EPOLLIN error %s\n",
events[n].data.fd, strerror(errno));
return -1;
}
printf("EPOLLOUT changed to EPOLLIN \n") ;
}
}
}
}
close(listener);
return 0;
}
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