link: Update documentation.

[gnulib.git] / m4 / socklen.m4

diff --git a/m4/socklen.m4 b/m4/socklen.m4
index 7db6ba3..2933d4b 100644 (file)
--- a/m4/socklen.m4
+++ b/m4/socklen.m4
@@ -1,42 +1,52 @@
-# socklen.m4 serial 2
-dnl Copyright (C) 2005 Free Software Foundation, Inc.
+# socklen.m4 serial 7
+dnl Copyright (C) 2005, 2006, 2007, 2009, 2010 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.
+
+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_CHECK_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_gl_cv_socklen_t_equiv],
+      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>
+           for t in int size_t "unsigned int" "long int" "unsigned long int"; do
+             AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+                 [[#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"])
+                   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
+           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])
+        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>
-      #include <sys/socket.h>])])
+      #if HAVE_SYS_SOCKET_H
+      # include <sys/socket.h>
+      #elif HAVE_WS2TCPIP_H
+      # include <ws2tcpip.h>
+      #endif])])