Windows has supported socket (AF_UNIX, SOCK_STREAM, ...) since 2017 [1].
The checks in m4/sockpfaf.m4 where written before then. I've committed
this patch to support Windows.
On Windows version that support it, afunix.h is a small file with the
following type:
typedef struct sockaddr_un {
ADDRESS_FAMILY sun_family;
char sun_path[UNIX_PATH_MAX];
} SOCKADDR_UN, *PSOCKADDR_UN;
And AF_UNIX is defined in winsock2.h. Since Gnulib's sys/socket.h
includes this winsock2.h on Windows it will be defined in the proper
place if supported.
I'll write a sys_un module to deal with including afunix.h tomorrow.
Collin
[1] https://devblogs.microsoft.com/commandline/af_unix-comes-to-windows/
>From d3efdd55f36a01118ed936da25633858a5757897 Mon Sep 17 00:00:00 2001
From: Collin Funk <collin.fu...@gmail.com>
Date: Tue, 23 Jul 2024 21:31:06 -0700
Subject: [PATCH] Detect UNIX domain sockets supported by recent Windows
versions.
* m4/sockpfaf.m4 (gl_SOCKET_FAMILY_UNIX): Check for afunix.h if
winsock2.h is found. Include it in the compile check.
---
ChangeLog | 4 ++++
m4/sockpfaf.m4 | 12 +++++++++++-
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/ChangeLog b/ChangeLog
index 5910b4699c..3e9d691efa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
2024-07-23 Collin Funk <collin.fu...@gmail.com>
+ Detect UNIX domain sockets supported by recent Windows versions.
+ * m4/sockpfaf.m4 (gl_SOCKET_FAMILY_UNIX): Check for afunix.h if
+ winsock2.h is found. Include it in the compile check.
+
sys_socket tests: Fix mistake in previous commit.
* modules/sys_socket-tests (configure.ac): Invoke gl_SOCKET_FAMILY_UNIX.
diff --git a/m4/sockpfaf.m4 b/m4/sockpfaf.m4
index c68b3abbce..44ac7fd947 100644
--- a/m4/sockpfaf.m4
+++ b/m4/sockpfaf.m4
@@ -1,5 +1,5 @@
# sockpfaf.m4
-# serial 10
+# serial 11
dnl Copyright (C) 2004, 2006, 2009-2024 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -64,6 +64,13 @@ AC_DEFUN([gl_SOCKET_FAMILY_UNIX]
AC_REQUIRE([gl_SYS_SOCKET_H])
AC_CHECK_HEADERS_ONCE([sys/un.h])
+ dnl Windows versions released after 2017 may have support for AF_UNIX.
+ dnl Including it requires types from <winsock2.h> to be defined.
+ dnl <https://devblogs.microsoft.com/commandline/af_unix-comes-to-windows/>.
+ if test "$ac_cv_header_winsock2_h" = yes; then
+ AC_CHECK_HEADERS([afunix.h], [], [], [#include <winsock2.h>])
+ fi
+
AC_CACHE_CHECK([for UNIX domain sockets],
[gl_cv_socket_unix],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
@@ -75,6 +82,9 @@ AC_DEFUN([gl_SOCKET_FAMILY_UNIX]
#endif
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
+#endif
+#ifdef HAVE_AFUNIX_H
+#include <afunix.h>
#endif]],
[[int x = AF_UNIX; struct sockaddr_un y;
if (&x && &y) return 0;]])],
--
2.45.2
