epoll api

epoll_test.c

#include <stdio.h>
#include <unistd.h>
#include <sys/epoll.h>
#include <string.h>

int main() {
    int epoll_fd = epoll_create1(0);
    struct epoll_event event, events[5];
    char read_buffer[11];
    int running = 1, event_count, i;
    ssize_t bytes_read;

    if (epoll_fd == -1) {
        fprintf(stderr, "Failed to create epoll fd!");
        return 1;
    }
    event.events = EPOLLIN;
    event.data.fd = 0;

    if(epoll_ctl(epoll_fd, EPOLL_CTL_ADD, 0, &event)) {
        fprintf(stderr, "Failed to add fd to epoll!");
        close(epoll_fd);
        return 1;
    }
    while(running) {
        printf("Polling for input...\n");
        event_count = epoll_wait(epoll_fd, events, 5, 30000);
        printf("ready events count :%d\n",event_count);
        for(i=0; i<event_count; i++) {
            printf("reading fd %d, ", events[i].data.fd);
            bytes_read = read(events[i].data.fd, read_buffer, 10);
            printf("read bytes %d\n", bytes_read);
            read_buffer[bytes_read]= '\0';
            printf("read '%s' \n", read_buffer);
            if (!strncmp(read_buffer, "quit\n", 5)) {
                running = 0;
            }
        }
    }

    if (close(epoll_fd)) {
        fprintf(stderr, "Failed to close epoll fd!");
        return 1;
    }
    return 0;
}