epoll 使用实例

原文：http://blog.csdn.net/force_eagle/article/details/4348017

epoll网上g一大把, 就不详细叙述了.

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#include
#include
#include
#include
#include
#include
#include
#include
#include

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

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;
}