linux poll机制使用

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/poll.h>

int main() {
    struct pollfd fds[2];
    int timeout = 5000; // 5 seconds

    fds[0].fd = STDIN_FILENO;
    fds[0].events = POLLIN;

    fds[1].fd = open("/tmp/myfifo", O_RDONLY);
    if (fds[1].fd == -1) {
        perror("open");
        exit(EXIT_FAILURE);
    }
    fds[1].events = POLLIN;

    int ret = poll(fds, 2, timeout);
    if (ret == -1) {
        perror("poll");
        exit(EXIT_FAILURE);
    }

    if (ret > 0) {
        if (fds[0].revents & POLLIN) {
            printf("Data is available on stdin\n");
        }
        if (fds[1].revents & POLLIN) {
            printf("Data is available on FIFO\n");
        }
    } else {
        printf("Timeout occurred\n");
    }

    close(fds[1].fd);
    return 0;
}