linux poll 实例

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

int main() {
    struct pollfd fds[2];
    int ret;

    // 监视标准输入
    fds[0].fd = STDIN_FILENO;
    fds[0].events = POLLIN;

    // 假设我们还有一个文件描述符 fd1 需要监视
    int fd1 = open("example.txt", O_RDONLY);
    if (fd1 == -1) {
        perror("open");
        return 1;
    }
    fds[1].fd = fd1;
    fds[1].events = POLLIN;

    while (1) {
        ret = poll(fds, 2, -1); // 阻塞等待事件
        if (ret == -1) {
            perror("poll");
            break;
        }

        if (fds[0].revents & POLLIN) {
            printf("Data is available on stdin\n");
            char buf[1024];
            read(STDIN_FILENO, buf, sizeof(buf));
            printf("Read from stdin: %s\n", buf);
        }

        if (fds[1].revents & POLLIN) {
            printf("Data is available on file descriptor %d\n", fd1);
            char buf[1024];
            read(fd1, buf, sizeof(buf));
            printf("Read from file: %s\n", buf);
        }
    }

    close(fd1);
    return 0;
}