[glib] Always include G_SOCKET_FAMILY_UNIX value in GSocketFamily

[Rodrigo Moya <rodrigo src gnome org>]

commit 118c42e7471155d444b9df38d9538f344cb7f89c
Author: Rodrigo Moya <rodrigo gnome-db org>
Date:   Wed Apr 4 11:39:03 2012 +0200

    Always include G_SOCKET_FAMILY_UNIX value in GSocketFamily
    
    This is needed because glib-mkenums doesn't handle #ifdef values in
    enums, and so it needs to have all values always defined in the enum.
    When not available, define the missing values to a negative value.

 configure.ac   |   12 +++++++++++-
 gio/gioenums.h |    2 --
 gio/gsocket.c  |    7 +++++++
 3 files changed, 18 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9a40961..cbd868d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3344,7 +3344,17 @@ g_pollhup=$glib_cv_value_POLLHUP
 g_pollerr=$glib_cv_value_POLLERR
 g_pollnval=$glib_cv_value_POLLNVAL
 
-g_af_unix=$glib_cv_value_AF_UNIX
+# If a family is not found on the system, define that family to
+# a negative value, picking a different one for each undefined
+# family (-1 for AF_UNIX, -2 for the next one, -3 ...)
+# This is needed because glib-mkenums doesn't handle optional
+# values in enums, and thus we have to have all existing values
+# defined in the enum.
+if "x$glib_cv_value_AF_UNIX" != "x"; then
+  g_af_unix=$glib_cv_value_AF_UNIX
+else
+  g_af_unix=-1
+fi
 g_af_inet=$glib_cv_value_AF_INET
 g_af_inet6=$glib_cv_value_AF_INET6
 
diff --git a/gio/gioenums.h b/gio/gioenums.h
index 61f8aa3..dd97230 100644
--- a/gio/gioenums.h
+++ b/gio/gioenums.h
@@ -687,9 +687,7 @@ typedef enum /*< flags >*/ {
  */
 typedef enum {
   G_SOCKET_FAMILY_INVALID,
-#ifdef GLIB_SYSDEF_AF_UNIX
   G_SOCKET_FAMILY_UNIX = GLIB_SYSDEF_AF_UNIX,
-#endif
   G_SOCKET_FAMILY_IPV4 = GLIB_SYSDEF_AF_INET,
   G_SOCKET_FAMILY_IPV6 = GLIB_SYSDEF_AF_INET6
 } GSocketFamily;
diff --git a/gio/gsocket.c b/gio/gsocket.c
index 0fa133f..b24000f 100644
--- a/gio/gsocket.c
+++ b/gio/gsocket.c
@@ -500,6 +500,13 @@ g_socket_create_socket (GSocketFamily   family,
       g_assert_not_reached ();
     }
 
+  if (family < 0)
+    {
+      g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
+                   _("Unable to create socket: %s"), _("Unknown family was specified"));
+      return -1;
+    }
+
   if (protocol == -1)
     {
       g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,