Two types of filehandle.read return different values

[nujarum]

Version

v14.18.3 / v16.13.2

Platform

Microsoft Windows NT 10.0.19044.0 x64

Subsystem

fs/promises

What steps will reproduce the bug?

import { open } from 'fs/promises';

const path = '/path/to/file';
const fh = await open(path, 'w+'); // reading & writing

const input = new Uint8Array([0, 1, 2, 3]);
await fh.writeFile(input);

const length = input.byteLength;
const buffer = new Uint8Array(length);
const offset = 0;
const position = 0;

const result1 = await fh.read(buffer, offset, length, position);     // 4 parameters
const result2 = await fh.read({ buffer, offset, length, position }); // 1 object parameter

console.log('result1:', result1);
console.log('result2:', result2);

How often does it reproduce? Is there a required condition?

No response

What is the expected behavior?

I think the expected behavior is that these two return values are the same.

What do you see instead?

result1: { bytesRead: 4, buffer: Uint8Array(4) [ 0, 1, 2, 3 ] }
result2: { bytesRead: 0, buffer: Uint8Array(4) [ 0, 1, 2, 3 ] }

Additional information

No response

[nujarum]

I get the same result even if I reverse the order of execution, but is it expected behavior?

const result2 = await fh.read({ buffer, offset, length, position }); // => { bytesRead: 0, buffer: Uint8Array(4) [ 0, 1, 2, 3 ] }
const result1 = await fh.read(buffer, offset, length, position);     // => { bytesRead: 4, buffer: Uint8Array(4) [ 0, 1, 2, 3 ] }

[Trott]

@nodejs/fs

[christian102094]

I think this was a bug (see #40715 and #40699). Already fixed in #40716. I guess it was released in Node version 17.2.x (#40983).

[nujarum]

@christian102094 Thanks for the information.

Sorry, I was not aware of those closed issues.

Should I close this issue?

[benjamingr]

@nujarum if you can verify this works for you in latest node that'd be helpful - after that sure!

Thanks for the report btw.

[nujarum]

Sorry for late reply.

I have confirmed that this has been fixed in the latest version v17.4.0.

$ node -v
v17.4.0

const result2 = await fh.read({ buffer, offset, length, position });
// => result2: { bytesRead: 4, buffer: Uint8Array(4) [ 0, 1, 2, 3 ] }

Now that I understand the cause of this problem, I am going to close this issue.

(I hope this will be fixed in the LTS versions, v14 and v16. 😉)