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std.Io: move getting of stdin/out/err to the vtable #35654

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opened 2026年06月07日 07:30:04 +02:00 by lukasl · 1 comment

lukasl commented

2026年06月07日 07:30:04 +02:00

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In an async runtime, there are some preparation steps that need to be done on the file descriptors, in order to use them.

They could be pipes, or could be backed by real files. These two cases require different strategies when using kqueue/epoll. Plus, if it's a pipe, it needs to be marked as non-blocking.

It would be ideal, if these were part of the vtable. It would also allow mock implementations of Io to provide their own.

In an async runtime, there are some preparation steps that need to be done on the file descriptors, in order to use them. They could be pipes, or could be backed by real files. These two cases require different strategies when using kqueue/epoll. Plus, if it's a pipe, it needs to be marked as non-blocking. It would be ideal, if these were part of the vtable. It would also allow mock implementations of `Io` to provide their own.

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2026年06月09日 11:43:21 +02:00

lukasl commented

2026年06月21日 07:28:30 +02:00

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This is even more important on Windows, as I can't use the TEB handles directly, they need to be checked, possible re-opened, in order to be able to do async I/O on them. It would be much nicer if it was in the interface, rather than having a side table for all handlers and doing it that way.

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