从`stdin`读取时如何添加超时 [英] How to add a timeout when reading from `stdin`

问题描述

我需要检查用户是否花费了超过3000ms的时间在 stdin 上进行输入.

I need to check if the user took more than 3000ms to give input on stdin.

有没有办法在等待用户输入时添加超时?像

Is there a way to add a timeout when waiting for user input? Something like

if (timeout) {
  // do something
} else {
  // do something else
}

推荐答案

下面的程序将从超时的 stdin 中读取，这是您想要的.

The following program will read from stdin with a timeout, which is what you want.

#include <stdio.h>
#include <unistd.h>
#include <sys/select.h>

#define LEN 100

int main() {
    struct timeval timeout = {3, 0};
    fd_set fds;
    FD_ZERO(&fds);
    FD_SET(STDIN_FILENO, &fds);
    printf("Hi. What is your name?\n");
    int ret = select(1, &fds, NULL, NULL, &timeout);
    if (ret == -1) {
        printf("Oops! Something wrong happened...\n");
    } else if (ret == 0) {
        printf("Doesn't matter. You're too slow!\n");
    } else {
        char name[LEN];
        fgets(name, LEN, stdin);
        printf("Nice to meet you, %s\n", name);
    }
    return 0;
}

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