[issue10350] errno is read too late

[Hallvard B Furuseth]

New submission from Hallvard B Furuseth <h.b.furuseth at usit.uio.no>:

errno is sometimes read too late after the error:  After another call
may have modified it.  Here's a patch against py3k.  Most of it or a
variant applies to 2.7 too, but I haven't really looked at that.

I've not looked at math code, where I don't even know what sets errno.

There might also be a late errno read at Modules/_ctypes/callproc.c
line 794: "space[0] = errno;".  Does it want the errno from before
_ctypes_get_errobj()?  I'm unsure what's going on there.

Modules/_multiprocessing/semaphore.c doesn't need the patch's extra
variable, it can instead be rearranged with the commented-out patch.

----------
components: None
files: late-errno.diff
keywords: patch
messages: 120719
nosy: hfuru
priority: normal
severity: normal
status: open
title: errno is read too late
type: behavior
versions: Python 2.7, Python 3.1, Python 3.2
Added file: http://bugs.python.org/file19539/late-errno.diff

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