Andreas Kling a7b5a58509 Kernel: Fix sys$select() not marking fd's after blocking was avoided ...

In case multiple file descriptors in the `fd_set` were already readable
and/or writable when calling Thread::block<SelectBlocker>(), we would
only mark the first fd in the output sets instead of all relevant fd's.

The short-circuit code path when blocking isn't necessary must ensure
that unblock flags are collected for all file descriptors, not just the
first one encountered.

Fixes #5795.

2021-03-15 21:21:52 +01:00

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