2916 DTrace in a zone should be able to access fds[]

@@ -21,11 +21,13 @@
 /*
  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma ident   "%Z%%M% %I%     %E% SMI"
+/*
+ * Copyright (c) 2012, Joyent, Inc. All rights reserved.
+ */
 
 #pragma D depends_on module unix
 #pragma D depends_on provider io
 
 inline int B_BUSY = @B_BUSY@;

@@ -195,13 +197,11 @@
             F->f_vnode->v_vfsp->vfs_vnodecovered->v_path == NULL ? "<unknown>" :
             cleanpath(F->f_vnode->v_vfsp->vfs_vnodecovered->v_path);
         fi_oflags = F == NULL ? 0 : F->f_flag + (int)@FOPEN@;
 };
 
-inline fileinfo_t fds[int fd] = xlate <fileinfo_t> (
-    fd >= 0 && fd < curthread->t_procp->p_user.u_finfo.fi_nfiles ?
-    curthread->t_procp->p_user.u_finfo.fi_list[fd].uf_file : NULL);
+inline fileinfo_t fds[int fd] = xlate <fileinfo_t> (getf(fd));
 
 #pragma D attributes Stable/Stable/Common fds
 #pragma D binding "1.1" fds
 
 #pragma D binding "1.2" translator