[issue10350] errno is read too late

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

This stuff is hard to write automated tests for, hence there are none.

The patch is mostly straightforward: capture errno with new variable err at point of possible error when intervening calculation is needed before testing the value of errno. This seems like a good idea.

There is one relocation of memory freeing and the additions of
+        if (res >= 0)
+            break;
which I cannot evaluate.

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nosy: +terry.reedy
stage:  -> patch review

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