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.\" Copyright (c) 2003 Joseph Koshy <jkoshy@FreeBSD.org>
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.\" $FreeBSD: release/10.0.0/share/man/man9/cr_seeothergids.9 208291 2010-05-19 08:57:53Z uqs $
.\"
.Dd November 11, 2003
.Dt CR_SEEOTHERGIDS 9
.Os
.Sh NAME
.Nm cr_seeothergids
.Nd determine visibility of objects given their group memberships
.Sh SYNOPSIS
.Ft int
.Fn cr_seeothergids "struct ucred *u1" "struct ucred *u2"
.Sh DESCRIPTION
This function determines the visibility of objects in the
kernel based on the group IDs in the credentials
.Fa u1
and
.Fa u2
associated with them.
.Pp
The visibility of objects is influenced by the
.Xr sysctl 8
variable
.Va security.bsd.see_other_gids .
If this variable is non-zero then all objects in the kernel
are visible to each other irrespective of their group membership.
If this variable is zero then the object with credentials
.Fa u2
is visible to the object with credentials
.Fa u1
if either
.Fa u1
is the super-user credential, or if at least one of
.Fa u1 Ns 's
group IDs is present in
.Fa u2 Ns 's
group set.
.Sh SYSCTL VARIABLES
.Bl -tag -width indent
.It Va security.bsd.see_other_gids
Must be non-zero if objects with unprivileged credentials are to be
able to see each other.
.El
.Sh RETURN VALUES
This function returns zero if the object with credential
.Fa u1
can
.Dq see
the object with credential
.Fa u2 ,
or
.Er ESRCH
otherwise.
.Sh SEE ALSO
.Xr cr_seeotheruids 9 ,
.Xr p_candebug 9
