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Diffstat (limited to 'share/man/man9/p_cansee.9')
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diff --git a/share/man/man9/p_cansee.9 b/share/man/man9/p_cansee.9 new file mode 100644 index 000000000000..92ffeeaaa786 --- /dev/null +++ b/share/man/man9/p_cansee.9 @@ -0,0 +1,93 @@ +.\" +.\" 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. +.\" +.\" $FreeBSD$ +.\" +.Dd November 19, 2006 +.Os +.Dt P_CANSEE 9 +.Sh NAME +.Nm p_cansee +.Nd determine visibility of a process +.Sh SYNOPSIS +.In sys/param.h +.In sys/proc.h +.Ft int +.Fn p_cansee "struct thread *td" "struct proc *p" +.Sh DESCRIPTION +This function can be used to determine 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 +The function is implemented using +.Xr cr_cansee 9 , +and the dependencies on +.Xr sysctl 8 +variables documented in the +.Xr cr_cansee 9 +manual page apply. +.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 a non-zero error return value otherwise. +.Sh ERRORS +.Bl -tag -width Er +.It Bq Er ESRCH +Process +.Fa p +is not visible to thread +.Fa td +as determined by +.Xr cr_cansee 9 . +.It Bq Er ESRCH +Thread +.Fa td +has been jailed and process +.Fa p +does not belong to the same jail as +.Fa td . +.It Bq Er ESRCH +The MAC subsystem denied visibility. +.El +.Sh SEE ALSO +.Xr jail 2 , +.Xr sysctl 8 , +.Xr cr_cansee 9 , +.Xr mac 9 , +.Xr p_candebug 9 , +.Xr prison_check 9 |