How do you find the current team ID?

Development
1

According to the Be Book you can find out if areas are shared by testing if the area’s team is equal to the current team. The area_info header contains the team of the area but how do I find out the current team ID? So far I’ve found an iterator for all areas, and another for all teams, but when I try to find a simple getter for the current team there doesn’t seem to be one there. Passing a 0 to most team functions is a shorthand for the current team but that doesn’t seem to work for the comparison.

2

Call be_app->Team();

See BApplication::GetAppInfo() method here for more info:
https://www.haiku-os.org/legacy-docs/bebook/BApplication.html

1 Like
3

Here is a more low level version:

2 Likes
4

Thanks! One of those should work under Rust’s FFI.

Edit

AppMisc.h appears to be private so i guess CurrentTeam() shouldn’t be added to the FFI.

I guess I’d better see about making a Rust header for ApplicationKit.

5

BApplications are only used in GUI applications, generally. Instead, you should call get_thread_info the same way current_team does in the above code.

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6

Thanks! I won’t be writing graphical utilities in Wasmer for a while. Now I see what you mean.

7

The most portable way is to use the get_thread_info(), which is part of libroot and OS.h. See this code snippet for how I did it previously. Both functions called in this code snippet are now part of the libc crate.

Note that you might have to use MaybeUnit<T> on recent rustc builds, because thread_info contains function pointers.

EDIT: just saw that @waddlesplash gave the same answer. I hope the additional notes help.

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8

Yeah my intention sharing that snippet was to show how to do it, since it is only a few lines of code. I should have added more context.

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9

Maybe use getpid()

10

Placeholder code banished and real code written.

@korli
It’s already written in Rust now.

@nielx
You were right. It needed the MaybeUninit::<thread_info>::uninit() and an .as_mut_ptr() on the pass into the function. Once the B_OK code was confirmed I assigned it to the .assume_init() quantity.