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+.\"
+.\" Copyright (c) 2003 Joseph Koshy <jkoshy@FreeBSD.org>
+.\" Copyright (c) 2006 Ceri Davies <ceri@FreeBSD.org>
+.\"
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd August 18, 2023
+.Dt P_CANSEE 9
+.Os
+.Sh NAME
+.Nm p_cansee
+.Nd determine visibility of a process
+.Sh SYNOPSIS
+.In sys/proc.h
+.Ft int
+.Fn p_cansee "struct thread *td" "struct proc *p"
+.Sh DESCRIPTION
+This function determines if a given process
+.Fa p
+is visible to the thread
+.Fa td ,
+where the notion of
+.Dq visibility
+may be read as
+.Dq "awareness of existence" .
+.Pp
+This function explicitly allows a thread to always see its own process,
+even with pending credentials changes
+.Po
+see
+.Xr ucred 9
+.Pc .
+Otherwise, it simply defers to
+.Xr cr_cansee 9 .
+.Sh RETURN VALUES
+The
+.Fn p_cansee
+function
+returns
+.Li 0
+if the process denoted by
+.Fa p
+is visible by thread
+.Fa td ,
+or ESRCH otherwise.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er ESRCH
+Thread
+.Fa td
+is not part of process
+.Fa p
+and cannot see it as determined by
+.Xr cr_cansee 9 .
+.El
+.Sh SEE ALSO
+.Xr cr_cansee 9 ,
+.Xr p_candebug 9 ,
+.Xr ucred 9