Re: [Libguestfs] [nbdkit] Windows errno handling
On Mon, Aug 17, 2020 at 07:36:00PM +0100, Richard W.M. Jones wrote:
We'd have to then need to wrap all assignments to errno
in a macro like:
#ifndef WIN32
#define set_errno(v) (errno = (v))
#else
#define set_errno(v) (WSASetLastError (translate_from_errno (v)))
#endif
This is very invasive for existing code. There are ~60 places in the
existing code which seem to assign to errno, ...
I think we _don't_ need to do this. That's because we never actually
want to call WSASetLastError for a couple of reasons: (a) Just like
for Linux, no Windows API call would be affected by WSASetLastError.
(b) errno is a thread safe global variable on Windows which can also
be assigned
(https://stackoverflow.com/questions/6413052/msvc-errno-thread-safety).
Rich.
--
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