epoll 使用实例
epoll网上g一大把, 就不详细叙述了.推荐几篇好文章:
epoll精髓
epoll相关资料整理
epoll LT VS ET
epoll(7) - Linux man page
EPOLL为我们带来了什么
#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 operationsEPOLLIN | 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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