X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fsocklen.m4;h=b755757be43c91d0b48c6e0027c829466e6c6a34;hb=b52ae09f3a74d02e4f203c4b7703416d3b3b5461;hp=71ea952b6ba88b386c55bb5d5207f356c477b790;hpb=1f910260f8145ea0b067ca85be6f92bd43adc375;p=gnulib.git

diff --git a/m4/socklen.m4 b/m4/socklen.m4
index 71ea952b6..b755757be 100644
--- a/m4/socklen.m4
+++ b/m4/socklen.m4
@@ -1,20 +1,52 @@
-# socklen.m4 serial 1
-dnl Copyright (C) 2005 Free Software Foundation, Inc.
+# socklen.m4 serial 6
+dnl Copyright (C) 2005, 2006, 2007 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 Simon Josefsson.
+dnl From Albert Chin, Windows fixes from Simon Josefsson.
 
-AC_DEFUN([gl_SOCKLEN_T],
-[
-  AC_CHECK_HEADERS_ONCE(sys/types.h sys/socket.h)
-  AC_CHECK_TYPE([socklen_t],, [AC_DEFINE([socklen_t], [int],
-                [Map `socklen_t' to `int' if it is missing.])], [
-#ifdef HAVE_SYS_TYPES_H
-# include <sys/types.h>
-#endif
-#ifdef HAVE_SYS_SOCKET_H
-# include <sys/socket.h>
-#endif)
-])
+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.
+
+dnl On mingw32, socklen_t is in ws2tcpip.h ('int'), so we try to find
+dnl it there first.  That file is included by gnulib's sys_socket.in.h, which
+dnl all users of this module should include.  Cygwin must not include
+dnl ws2tcpip.h.
+AC_DEFUN([gl_TYPE_SOCKLEN_T],
+  [AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl
+   AC_CHECK_TYPE([socklen_t], ,
+     [AC_MSG_CHECKING([for socklen_t equivalent])
+      AC_CACHE_VAL([gl_cv_socklen_t_equiv],
+	[# Systems have either "struct sockaddr *" or
+	 # "void *" as the second argument to getpeername
+	 gl_cv_socklen_t_equiv=
+	 for arg2 in "struct sockaddr" void; do
+	   for t in int size_t "unsigned int" "long int" "unsigned long int"; do
+	     AC_TRY_COMPILE(
+	       [#include <sys/types.h>
+		#include <sys/socket.h>
+
+		int getpeername (int, $arg2 *, $t *);],
+	       [$t len;
+		getpeername (0, 0, &len);],
+	       [gl_cv_socklen_t_equiv="$t"])
+	     test "$gl_cv_socklen_t_equiv" != "" && break
+	   done
+	   test "$gl_cv_socklen_t_equiv" != "" && break
+	 done
+      ])
+      if test "$gl_cv_socklen_t_equiv" = ""; then
+	AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
+      fi
+      AC_MSG_RESULT([$gl_cv_socklen_t_equiv])
+      AC_DEFINE_UNQUOTED([socklen_t], [$gl_cv_socklen_t_equiv],
+	[type to use in place of socklen_t if not defined])],
+     [#include <sys/types.h>
+      #if HAVE_SYS_SOCKET_H
+      # include <sys/socket.h>
+      #elif HAVE_WS2TCPIP_H
+      # include <ws2tcpip.h>
+      #endif])])