configure check for cast to please lint.

git-svn-id: file:///svn/unbound/trunk@213 be551aaa-1e26-0410-a405-d3ace91eadb9

configure.ac

@@ -313,6 +313,29 @@ AC_INCLUDES_DEFAULT
 #endif
 ])
 
+# Check the type of struct msghdr msg_iovlen.
+AC_MSG_CHECKING([sign of struct msghdr.msg_iovlen])
+AC_RUN_IFELSE([
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/socket.h>
+int main()
+{
+	struct msghdr h;
+	h.msg_iovlen = -1;
+	if(10/h.msg_iovlen == 0) return 0; /* unsigned */
+	return 1; /* signed */
+}
+], [ 
+# if compiled and exit status 0
+cv_msgiovlen_type="unsigned" ], [ 
+# not compiled or bad exit status
+cv_msgiovlen_type="int" ], 
+# when cross compiling
+[ cv_msgiovlen_type="int" ])
+AC_MSG_RESULT($cv_msgiovlen_type)
+AC_DEFINE_UNQUOTED([TYPE_MSGIOVLEN], $cv_msgiovlen_type, [Define to 'int' or type of struct msghdr.msg_iovlen.])
+
 # Checks for libraries.
 AC_ARG_WITH(ssl, AC_HELP_STRING([--with-ssl=pathname],
                                     [enable SSL (will check /usr/local/ssl

doc/Changelog

@@ -1,3 +1,9 @@
+3 April 2007: Wouter
+	- detect sign of msghdr.msg_iovlen so that the cast to that type
+	  in netevent (which is there to please lint) can be correct.
+	  The type on several OSes ranges from int, int32, uint32, size_t.
+	  Detects unsigned or signed using math trick.
+
 2 April 2007: Wouter
 	- check sizes of udp received messages, not too short.
 	- review changes. Some memmoves can be memcpys: 4byte aligned.

testcode/testbed.sh

@@ -123,7 +123,7 @@ for((i=0; i<${#hostname[*]}; i=$i+1)); do
 	SVN=yes
 	IP6=yes
 	FIXCONFIGURE=no
-	RUN_TEST=yes
+	RUN_TEST=no
 	LDNS=
 	LIBEVENT=
 	eval ${vars[$i]}

util/netevent.c

@@ -790,7 +790,7 @@ comm_point_send_reply_iov(struct comm_reply* repinfo, struct iovec* iov,
 		hdr.msg_name = &repinfo->addr;
 		hdr.msg_namelen = repinfo->addrlen;
 		hdr.msg_iov = iov + 1;
-		hdr.msg_iovlen = (typeof(hdr.msg_iovlen))(iovlen - 1);
+		hdr.msg_iovlen = (TYPE_MSGIOVLEN)(iovlen - 1);
 		hdr.msg_control = NULL;
 		hdr.msg_controllen = 0;
 		hdr.msg_flags = 0;