linux+非阻塞键盘输入

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

int main() {
    int flags;

    // 打开标准输入
    int fd = STDIN_FILENO;

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

    // 设置O_NONBLOCK标志
    flags |= O_NONBLOCK;
    if (fcntl(fd, F_SETFL, flags) == -1) {
        perror("fcntl F_SETFL");
        exit(EXIT_FAILURE);
    }

    char buffer[100];
    while (1) {
        ssize_t bytesRead = read(fd, buffer, sizeof(buffer) - 1);

        if (bytesRead == -1) {
            if (errno == EAGAIN || errno == EWOULDBLOCK) {
                // 没有数据可读，继续执行其他任务
                printf("No input available, doing other tasks...\n");
                sleep(1); // 模拟执行其他任务
            } else {
                perror("read");
                break;
            }
        } else if (bytesRead > 0) {
            buffer[bytesRead] = '\0';
            printf("Input received: %s\n", buffer);
        }
    }

    return 0;
}