gh-127385: Add F_DUPFD_QUERY to fcntl

[rruuaanng]

• Issue: Add F_DUPFD_QUERY to fcntl #127385

[ZeroIntensity]

This PR is trying to do too many things. I don't really see the need for the switch to a new macro, but if we do end up doing that, it should be in another PR. Please revert that and keep this focused on the one new macro.

[rruuaanng]

@ZeroIntensity
I think you are right. Can you help me convert it into a draft? I'm mobile now.

The requested changes were addressed

[erlend-aasland]

This PR is trying to do too many things. I don't really see the need for the switch to a new macro, but if we do end up doing that, it should be in another PR. Please revert that and keep this focused on the one new macro.

@rruuaanng, please take Peter's words into account for future contributions. That piece of advice is also spelled out in the devguide.

[erlend-aasland]

I'll land this in a day or two.

[rruuaanng]

This PR is trying to do too many things. I don't really see the need for the switch to a new macro, but if we do end up doing that, it should be in another PR. Please revert that and keep this focused on the one new macro.

@rruuaanng, please take Peter's words into account for future contributions. That piece of advice is also spelled out in the devguide.

Yes, So I've completed his suggestion. I almost forgot it in the process :)

[ZeroIntensity]

Thank you :)

[rruuaanng]

Hold on, I need to add a document for fcntl, and I found the addition log in the existing documentation. And I confirmed that there is no corresponding document for my other PR

[serhiy-storchaka]

LGTM.