module: read from stdin when input is a pipe

[mostafaroshdy1]

Update the CommonJS module loader to detect when the input filename is /dev/stdin and stdin is a pipe. In such cases, read directly from file descriptor 0 instead of attempting to open the /proc//fd/pipe:[...] path, which can result in ENOENT errors.

This change ensures that running Node with piped input like:
printf 'console.log(1)' | node /dev/stdin
works reliably on Linux systems.

Fixes: #54200

[nodejs-github-bot]

Review requested:

• @nodejs/loaders

[aduh95]

Why not use - – or simply nothing

$ printf 'console.log(1)' | node -
1
$ printf 'console.log(1)' | node
1

[mostafaroshdy1]

Why not use - – or simply nothing

$ printf 'console.log(1)' | node -
1
$ printf 'console.log(1)' | node
1

Your snippet works correctly on Linux, but the issue specifically affects the case where node /dev/stdin is used.

On macOS, printf 'console.log(1)' | node /dev/stdin works as expected, but on Linux it fails because /dev/stdin resolves to a /proc/<pid>/fd/pipe:[xxxx] path that cannot be opened directly.

The fix ensures consistent behavior across platforms for this pattern.

[Renegade334]

This sort of thing has been reported before (#60342) but I wouldn't say that a hardcoded check for one specific path lends "consistency", and it's probably the one with the least motivation to address, given that – as mentioned – there's no need to provide a path to stdin to the CLI at all.

As far as the loader handling quirky symlinks to anonymous pipes goes, you can pass --preserve-symlinks if you really need to use these. The error message is a little confusing in these cases, and maybe there's a case for reporting a specific error, or adding to the existing error, in cases where a symlink has been followed but the resulting target fails to open.

[mostafaroshdy1]

@Renegade334 Thanks for providing more context.
What I meant by “consistency” was referring to the behavior itself, not necessarily the specific solution.
I’m completely open to discussing alternative approaches if needed , otherwise, this PR and the related issue can be closed.