uv different behavior under windows/linux

try_uv1.cpp

#include <stdio.h>
#include <stdlib.h>
#include <uv.h>
#include <chrono>
#include <thread>

using std::chrono::seconds;
using std::this_thread::sleep_for;

uv_fs_t open_req;
uv_fs_t read_req;

uv_buf_t iov;
char buffer[1024];

uv_check_t check_handle;
uv_idle_t idle_handle;

void on_check(uv_check_t *h)
{
	puts("check");
}

void on_idle(uv_idle_t *h)
{
	puts("idle");
	uv_check_start(&check_handle, on_check);
}

void on_read(uv_fs_t *req)
{
	if (req->result < 0) {
		fprintf(stderr, "read file fail: %s\n", uv_strerror((int)req->result));
		return;
	}

	if (req->result == 0) {
		uv_fs_t close_req;
		uv_fs_close(uv_default_loop(), &close_req, open_req.result, NULL);
		return;
	}

	buffer[req->result] = '\0';
	printf("len=%d '%s'\n", req->result, buffer);

	uv_idle_stop(&idle_handle);
	uv_check_stop(&check_handle);
}

void on_open(uv_fs_t *req)
{
	if (req->result < 0) {
		fprintf(stderr, "open file fail: %s\n", uv_strerror((int)req->result));
		return;
	}

	uv_idle_start(&idle_handle, on_idle);
	iov = uv_buf_init(buffer, sizeof buffer);
	uv_fs_read(uv_default_loop(), &read_req, req->result, &iov, 1, -1, on_read);

	puts("read start");

	sleep_for(seconds(2));
}

int main()
{
	uv_idle_init(uv_default_loop(), &idle_handle);
	uv_check_init(uv_default_loop(), &check_handle);

	// you need to create 1.txt first:
	//
	// echo 123 >1.txt
	//
	uv_fs_open(uv_default_loop(), &open_req, "1.txt", O_RDONLY, 0, on_open);
	uv_run(uv_default_loop(), UV_RUN_DEFAULT);

	uv_fs_req_cleanup(&open_req);
	uv_fs_req_cleanup(&read_req);
	return 0;
}

You need to create 1.txt first.

On Windows, it prints:

read start
idle
check
len=3 'xxx'

On Linux, it prints:

read start
idle
len=3 'xxx'

(Lacking check is due to L47 canceling the handler.)

Why their behaviors differ?