5880 Increase IOV_MAX to at least 1024
Portions contributed by: Jerry Jelinek <jerry.jelinek@joyent.com>

@@ -20,10 +20,11 @@
  */
 /*
  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
  *
  * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright 2015, Joyent, Inc. All rights reserved.
  */
 
 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
 /*        All Rights Reserved   */
 

@@ -427,10 +428,11 @@
 #define MSG_NOSIGNAL    0x200           /* Don't generate SIGPIPE */
 #define MSG_DUPCTRL     0x800           /* Save control message for use with */
                                         /* with left over data */
 #define MSG_XPG4_2      0x8000          /* Private: XPG4.2 flag */
 
+/* Obsolete but kept for compilation compatability. Use IOV_MAX. */
 #define MSG_MAXIOVLEN   16
 
 #ifdef _KERNEL
 
 /*