Xref capsicum(4) and procdesc(4) from pdfork(2).

Suggested by:	sbruno
MFC after:	3 days

lib/libc/sys/pdfork.2

@@ -1,10 +1,14 @@
 .\"
-.\" Copyright (c) 2009-2010, 2012 Robert N. M. Watson
+.\" Copyright (c) 2009-2010, 2012-2013 Robert N. M. Watson
 .\" All rights reserved.
 .\"
 .\" This software was developed at the University of Cambridge Computer
 .\" Laboratory with support from a grant from Google, Inc.
 .\"
+.\" This software was developed by SRI International and the University of
+.\" Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
+.\" ("CTSRD"), as part of the DARPA CRASH research programme.
+.\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions
 .\" are met:
@@ -28,7 +32,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd February 25, 2012
+.Dd August 28, 2013
 .Dt PDFORK 2
 .Os
 .Sh NAME
@@ -71,7 +75,9 @@ Instead of the default terminate-on-close behaviour, allow the process to
 live until it is explicitly killed with
 .Xr kill 2 .
 .Pp
-This option is not permitted in Capsicum capability mode (see
+This option is not permitted in
+.Xr capsicum 4
+capability mode (see
 .Xr cap_enter 2 ) .
 .El
 .Pp
@@ -119,6 +125,12 @@ is set; if the process is still alive and this is
 the last reference to the process descriptor, the process will be terminated
 with the signal
 .Dv SIGKILL .
+.Pp
+.Nm
+and associated functions depend on
+.Cd "options PROCDESC"
+described in
+.Xr procdesc 4 .
 .Sh RETURN VALUES
 .Fn pdfork
 returns a PID, 0 or -1, as
@@ -156,7 +168,9 @@ for
 .Xr fstat 2 ,
 .Xr kill 2 ,
 .Xr poll 2 ,
-.Xr wait4 2
+.Xr wait4 2 ,
+.Xr capsicum 4 ,
+.Xr procdesc 4
 .Sh HISTORY
 The
 .Fn pdfork ,