[PATCH v4 0/4] Enable unix socket support on Windows

[Bin Meng]

Support for the unix socket has existed both in BSD and Linux for the
longest time, but not on Windows. Since Windows 10 build 17063 [1],
the native support for the unix socket has come to Windows. Starting
this build, two Win32 processes can use the AF_UNIX address family
over Winsock API to communicate with each other.

[1] https://devblogs.microsoft.com/commandline/af_unix-comes-to-windows/

Changes in v4:
- instead of introducing CONFIG_AF_UNIX, add fallback afunix.h header
  in os-win32.h, and compile the AF_UNIX stuff for all Windows hosts
- drop CONFIG_AF_UNIX
- introduce a new helper socket_check_afunix_support() to runtime-check
  the availability of AF_UNIX socket, and skip those appropriately

Changes in v3:
- drop the run-time check afunix_available()

Changes in v2:
- move #include <afunix.h> to os-win32.h
- define WIN_BUILD_AF_UNIX only when CONFIG_WIN32
- drop #include <afunix.h> as it is now already included in osdep.h
- new patch: tests/unit: Update test-io-channel-socket.c for Windows

Bin Meng (4):
  util/qemu-sockets: Replace the call to close a socket with
    closesocket()
  util/qemu-sockets: Enable unix socket support on Windows
  chardev/char-socket: Update AF_UNIX for Windows
  tests/unit: Update test-io-channel-socket.c for Windows

 meson.build                         |  3 +++
 include/sysemu/os-win32.h           | 17 +++++++++++++
 tests/unit/socket-helpers.h         |  9 +++++++
 chardev/char-socket.c               |  4 ++--
 tests/unit/socket-helpers.c         | 16 +++++++++++++
 tests/unit/test-io-channel-socket.c | 37 ++++++++++++++++++-----------
 util/qemu-sockets.c                 | 29 ++--------------------
 7 files changed, 72 insertions(+), 43 deletions(-)

-- 
2.34.1