94 lines
2.5 KiB
Groff
94 lines
2.5 KiB
Groff
.\"
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.\" Copyright (c) 2003 Joseph Koshy <jkoshy@freebsd.org>
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.\" Copyright (c) 2006 Ceri Davies <ceri@FreeBSD.org>
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.\"
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 19, 2006
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.Os
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.Dt P_CANSEE 9
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.Sh NAME
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.Nm p_cansee
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.Nd determine visibility of a process
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/proc.h
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.Ft int
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.Fn p_cansee "struct thread *td" "struct proc *p"
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.Sh DESCRIPTION
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This function can be used to determine if a given process
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.Fa p
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is visible to the thread
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.Fa td ,
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where the notion of
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.Dq visibility
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may be read as
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.Dq "awareness of existence" .
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.Pp
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The function is implemented using
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.Xr cr_cansee 9 ,
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and the dependencies on
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.Xr sysctl 8
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variables documented in the
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.Xr cr_cansee 9
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manual page apply.
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.Sh RETURN VALUES
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The
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.Fn p_cansee
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function
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returns
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.Li 0
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if the process denoted by
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.Fa p
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is visible by thread
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.Fa td ,
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or a non-zero error return value otherwise.
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er ESRCH
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Process
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.Fa p
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is not visible to thread
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.Fa td
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as determined by
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.Xr cr_cansee 9 .
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.It Bq Er ESRCH
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Thread
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.Fa td
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has been jailed and process
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.Fa p
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does not belong to the same jail as
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.Fa td .
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.It Bq Er ESRCH
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The MAC subsystem denied visibility.
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.El
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.Sh SEE ALSO
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.Xr jail 2 ,
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.Xr sysctl 8 ,
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.Xr cr_cansee 9 ,
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.Xr mac 9 ,
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.Xr p_candebug 9 ,
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.Xr prison_check 9
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