epoll 使用实例

原文：/article/1667441.html

epoll网上g一大把, 就不详细叙述了.

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EPOLL为我们带来了什么

[cpp] view plaincopyprint?

#include <stdio.h>

#include <unistd.h>

#include <errno.h>

#include <time.h>

#include <sys/time.h>

#include <signal.h>

#include <poll.h>

#include <sys/types.h>

#include <error.h>

void call_poll(void)

{

struct pollfd fds;

int32_t timeout_msecs = 5000;

int err;

fds.fd = 1;

fds.events = POLLIN | POLLPRI ;

err = poll( &fds, 1, timeout_msecs );

if ( err > 0 ) {

printf("Data is available now./n");

}

else if ( err == 0 ) {

printf("No data within five seconds./n");

}

else {

perror( "poll()" );

}

}

#include <sys/epoll.h>

void call_epoll(void)

{

int epfd;

struct epoll_event ev_stdin;

int err;

epfd = epoll_create(1);

if ( epfd < 0 ) {

perror( "epoll_create()" );

return ;

}

bzero( &ev_stdin, sizeof( struct epoll_event) );

ev_stdin.events =

// available for read operations

EPOLLIN | EPOLLPRI

// available for write operations

// | EPOLLOUT

// Error condition && Hang up happened

| EPOLLERR | EPOLLHUP

// Sets the Edge Triggered behaviour

| EPOLLET

// Sets the one-shot behaviour.

// must call epoll_ctl with EPOLL_CTL_MOD to re-enable

| EPOLLONESHOT

;

err = epoll_ctl( epfd, EPOLL_CTL_ADD, 1, &ev_stdin );

if ( err < 0 ) {

perror( "epoll_ctl()" );

goto _out;

}

err = epoll_wait( epfd, &ev_stdin, 1, 5000 );

if ( err < 0 ) {

perror( "epoll_wait()" );

}

else if ( err == 0 ) {

printf("No data within five seconds./n");

}

else {

printf("Data is available now./n");

}

//err = epoll_ctl( epfd, EPOLL_CTL_DEL, 1, &ev_stdin );

//

err = epoll_ctl( epfd, EPOLL_CTL_DEL, 1, &ev_stdin );

if ( err < 0 ) {

perror( "epoll_ctl()" );

}

_out:

close( epfd );

}

int main ()

{

call_epoll();

return 0;

}



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