epoll 使用实例

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

#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; }