linux 多个异步通知

#include <sys/epoll.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>

#define MAX_EVENTS 10

int main() {
    int epoll_fd = epoll_create1(0);
    if (epoll_fd == -1) {
        perror("epoll_create1");
        exit(EXIT_FAILURE);
    }

    struct epoll_event event;
    event.events = EPOLLIN;
    event.data.fd = STDIN_FILENO;

    if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, STDIN_FILENO, &event) == -1) {
        perror("epoll_ctl: add");
        exit(EXIT_FAILURE);
    }

    struct epoll_event events[MAX_EVENTS];
    while (1) {
        int nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, -1);
        if (nfds == -1) {
            perror("epoll_wait");
            exit(EXIT_FAILURE);
        }

        for (int n = 0; n < nfds; ++n) {
            if (events[n].data.fd == STDIN_FILENO) {
                char buf[256];
                int len = read(STDIN_FILENO, buf, sizeof(buf));
                if (len == -1) {
                    perror("read");
                    exit(EXIT_FAILURE);
                }
                buf[len] = '\0';
                printf("Read: %s", buf);
            }
        }
    }

    close(epoll_fd);
    return 0;
}