Re: inet_ntop fix for mingw32

[Simon Josefsson]

This fixes the socklen M4 test.  It more or less duplicate the
sys_socket module but I don't see any other way around it.

Ok to install?

Index: socklen.m4
===================================================================
RCS file: /sources/gnulib/gnulib/m4/socklen.m4,v
retrieving revision 1.3
diff -u -p -u -w -r1.3 socklen.m4
--- socklen.m4  2 Dec 2005 18:23:00 -0000       1.3
+++ socklen.m4  18 Jan 2006 08:55:03 -0000
@@ -1,17 +1,18 @@
-# socklen.m4 serial 2
-dnl Copyright (C) 2005 Free Software Foundation, Inc.
+# socklen.m4 serial 3
+dnl Copyright (C) 2005, 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-dnl From Albert Chin.
+dnl From Albert Chin, Windows fixes from Simon Josefsson.
 
 dnl Check for socklen_t: historically on BSD it is an int, and in
 dnl POSIX 1g it is a type of its own, but some platforms use different
 dnl types for the argument to getsockopt, getpeername, etc.  So we
 dnl have to test to find something that will work.
 AC_DEFUN([gl_TYPE_SOCKLEN_T],
-  [AC_CHECK_TYPE([socklen_t], ,
+  [AC_CHECK_HEADERS_ONCE([sys/socket.h ws2tcpip.h])
+   AC_CHECK_TYPE([socklen_t], ,
      [AC_MSG_CHECKING([for socklen_t equivalent])
       AC_CACHE_VAL([gl_cv_gl_cv_socklen_t_equiv],
         [# Systems have either "struct sockaddr *" or
@@ -21,7 +22,12 @@ AC_DEFUN([gl_TYPE_SOCKLEN_T],
           for t in int size_t "unsigned int" "long int" "unsigned long int"; do
             AC_TRY_COMPILE(
               [#include <sys/types.h>
+               #if HAVE_SYS_SOCKET_H
                #include <sys/socket.h>
+                #endif
+               #if HAVE_WS2TCPIP_H
+                # include <ws2tcpip.h>
+                #endif
 
                int getpeername (int, $arg2 *, $t *);],
                [$t len;
@@ -39,4 +45,9 @@ AC_DEFUN([gl_TYPE_SOCKLEN_T],
       AC_DEFINE_UNQUOTED([socklen_t], [$gl_cv_socklen_t_equiv],
         [type to use in place of socklen_t if not defined])],
      [#include <sys/types.h>
-      #include <sys/socket.h>])])
+      #if HAVE_SYS_SOCKET_H
+      # include <sys/socket.h>
+      #endif
+      #if HAVE_WS2TCPIP_H
+      # include <ws2tcpip.h>
+      #endif])])