[ruby-core:120792] [Ruby master Bug#21038] Preserve `errno` in `rb_fiber_scheduler_unblock`

Issue #21038 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 3.1: REQUIRED, 3.2: REQUIRED, 3.3: DONE, 3.4: REQUIRED to 3.1: REQUIRED, 3.2: DONE, 3.3: DONE, 3.4: REQUIRED

ruby_3_2 commit:97243cc9c76b9cc2803cfd1c01165ab5bd432450 merged revision(s) commit:04ec07794657cd2444ecb001a522b9df2db1b90a.

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Bug #21038: Preserve `errno` in `rb_fiber_scheduler_unblock`
https://bugs.ruby-lang.org/issues/21038#change-111660

* Author: ioquatix (Samuel Williams)
* Status: Closed
* Backport: 3.1: REQUIRED, 3.2: DONE, 3.3: DONE, 3.4: REQUIRED
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`rb_fiber_scheduler_unblock` can invoke user code that can affect `errno`, and at least in `io_binwrite`, this is unexpected. Whether `io_binwrite` should be fixed is a separate issue (it probably should be, as `errno` is not explicitly preserved or documented how it is preserved).

See <https://github.com/socketry/io-event/issues/127> for more discussion.



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