Hi ,
I am a beginner to epoll usage . The following is a sample code
I have .
#include <sys/epoll.h>
#include "inet.h"
#include <errno.h>
extern int errno ;
main(argc, argv)
int argc;
char *argv[];
{
int sockfd, newsockfd, clilen, childpid;
struct sockaddr_in cli_addr, serv_addr;
pname = argv[0];
int pollfd = epoll_create(10);
/*
* Open a TCP socket (an Internet stream socket).
*/
if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
perror("socket failed");
struct epoll_event ev;
ev.events = EPOLLIN | EPOLLET ;
ev.data.fd = sockfd;
int ret = epoll_ctl(pollfd, EPOLL_CTL_ADD, sockfd , &ev);
/*
* Bind our local address so that the client can send to us.
*/
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(SERV_TCP_PORT);
if (bind(sockfd, (struct sockaddr *) &serv_addr,
sizeof(serv_addr)) < 0)
perror("bind:");
listen(sockfd, 5);
for ( ; ; ) {
/* Wait for a connection from a client process.
* This is an example of a concurrent server.
*/
struct epoll_event *events ;
errno = 0 ;
int ret = epoll_wait(pollfd , events , 10 , -1 ) ;
if(ret > 0 ) {
printf("yeah...epoll_wait worked \n");
} else if ( ret <0 ) {
printf("errno is %d\n" , errno ) ;
perror("epoll_wait:");
}
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd, (struct sockaddr *)
&cli_addr,
&clilen);
if (newsockfd < 0)
perror("accept:");
The epoll_wait consistently returns a EFAULT error . I am using a RedHat
Linux kernel version 2.6.5-1.358 .
The same epoll_wait works fine for a keyboard fd .
Is there a configuration issue or am I missing something .
TIA ,
Simha.
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