captureCallState versus critical

[David Lloyd]

One of the very first things I tried to do with the FFM API was to call
(unistd.h) `read` on a non-blocking file with a small heap buffer. Of
course, I was immediately rebuffed: it is not allowed to capture `errno`
from critical methods (including those which access the heap).

What is the reason for this restriction, and is there a possibility that it
could be relaxed in the future? Having to allocate (possibly tiny) off-heap
memory for any operation that may set `errno` is a difficult restriction in
terms of usability.

Thanks!
-- 
- DML • he/him
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