1 files changed, 65 insertions, 0 deletions
diff --git a/main/openvpn/m4/ax_socklen_t.m4 b/main/openvpn/m4/ax_socklen_t.m4
new file mode 100644
index 00000000..cd7cad8a
--- /dev/null
+++ b/main/openvpn/m4/ax_socklen_t.m4
@@ -0,0 +1,65 @@
+dnl -- The following is base of curl's acinclude.m4 --
+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([AX_TYPE_SOCKLEN_T], [
+	AC_CHECK_TYPE(
+		[socklen_t],
+		,
+		[
+			AS_VAR_PUSHDEF([VAR],[ax_cv_socklen_t_equiv])dnl
+			AC_CACHE_CHECK(
+				[for socklen_t equivalent],
+				[VAR],
+				[
+					#AS_CASE is not supported on <autoconf-2.60
+					case "${host}" in
+					*-mingw*) VAR=int ;;
+					*)
+						# Systems have either "struct sockaddr *" or
+						# "void *" as the second argument to getpeername
+						for arg2 in "struct sockaddr" void; do
+							for t in int size_t unsigned long "unsigned long"; 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);
+										]]
+									)],
+									[VAR="$t"; break]
+								)
+							done
+							test -n "$VAR" && break
+						done
+						;;
+					esac
+				]
+				AS_VAR_IF(
+					[VAR],
+					[],
+					[AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])],
+					[AC_DEFINE_UNQUOTED(
+						[socklen_t],
+						[$VAR],
+						[type to use in place of socklen_t if not defined]
+					)]
+				)
+			)
+		],
+		[[
+#include <sys/types.h>
+#ifdef WIN32
+#include <ws2tcpip.h>
+#else
+#include <sys/socket.h>
+#endif
+		]]
+	)
+])