11584 ::xcall would be useful
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>

@@ -22,11 +22,11 @@
  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 /*
  * Copyright (c) 2013, 2015 by Delphix. All rights reserved.
- * Copyright (c) 2015, Joyent, Inc.
+ * Copyright 2018 Joyent, Inc.
  */
 
 #ifndef _MDB_CTF_H
 #define _MDB_CTF_H
 

@@ -140,10 +140,11 @@
 
 extern ssize_t mdb_ctf_offset_to_name(mdb_ctf_id_t, ulong_t, char *, size_t,
     int, mdb_ctf_id_t *, ulong_t *);
 
 #define MDB_CTF_VREAD_QUIET             0x100
+#define MDB_CTF_VREAD_IGNORE_ABSENT     0x200
 
 extern int mdb_ctf_vread(void *, const char *, const char *,
     uintptr_t, uint_t);
 extern int mdb_ctf_readsym(void *, const char *, const char *, uint_t);