linux c 非阻塞输入

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

int main() {
    int flags;

    // 获取当前文件描述符的状态标志
    if ((flags = fcntl(STDIN_FILENO, F_GETFL, 0)) == -1) {
        perror("fcntl F_GETFL");
        exit(EXIT_FAILURE);
    }

    // 设置文件描述符为非阻塞模式
    if (fcntl(STDIN_FILENO, F_SETFL, flags | O_NONBLOCK) == -1) {
        perror("fcntl F_SETFL");
        exit(EXIT_FAILURE);
    }

    char buffer[100];
    while (1) {
        ssize_t bytesRead = read(STDIN_FILENO, buffer, sizeof(buffer));
        if (bytesRead == -1) {
            if (errno == EAGAIN || errno == EWOULDBLOCK) {
                // 没有数据可读，继续执行其他任务
                printf("No data available, doing other tasks...\n");
                sleep(1);
                continue;
            } else {
                perror("read");
                exit(EXIT_FAILURE);
            }
        } else if (bytesRead > 0) {
            buffer[bytesRead] = '\0';
            printf("Read: %s", buffer);
        }
    }

    return 0;
}