Between Unix and Windows socket are quite different:
- on Windows sockets have a different namespace from C file
descriptors so you can't use read/write/close or similar functions;
- errors are not stored in errno but you must be read/write the
errors with specific function;
- sometimes sockets are put in non-blocking mode automatically
calling some functions;
- SOCKET type is 64 bit on Windows 64 which does not fit technically
in an int. Is however safe to assume them to fit in an int.
So encapsulate the socket APIs in some definition to make easier
and more safe to deal with them.
Where the portability to Windows would make to code more offuscated a Unix
style was preferred. For instance if errors are detected errno is set from
Windows socket error instead of changing all code handling.
Fortunately on Windows Qemu core interface accepts socket (but not
other types like C file descriptors!).
Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
