FreeBSD-5.3/share/man/man9/vfs_suser.9

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.\" Copyright (c) 2004 Alfred Perlstein
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.\" $FreeBSD: src/share/man/man9/vfs_suser.9,v 1.1 2004/07/09 22:33:43 alfred Exp $
.\"
.Dd April 2, 2004
.Dt VFS_SUSER 9
.Os
.Sh NAME
.Nm vfs_suser
.Nd check if credentials have superuser privileges for a mount point
.Sh SYNOPSIS
.In sys/param.h
.In sys/systm.h
.In sys/mount.h
.Ft int
.Fn vfs_suser "struct mount *" "struct thread *td"
.Sh DESCRIPTION
The
.Fn vfs_suser
functions check if the credentials given include superuser powers
for the given mountpoint.  It will check to see if the thread
passed in has the same credentials as the user that mounted the
filesystem, if so it returns 0, otherwise it returns what
.Xr suser 9
would have returned.
.Sh RETURN VALUES
The
.Fn vfs_suser
functions return 0 if the user has superuser powers and
.Er EPERM
otherwise.
This is the
.Em reverse logic
of some other implementations of
.Fn suser
in which a TRUE response indicates superuser powers.
.Sh SEE ALSO
.Xr chroot 2 ,
.Xr jail 2 ,
.Xr suser 9
.Sh HISTORY
The
.Fn vfs_suser
function was introduced in
.Fx 5.2 .
.Sh AUTHORS
This manual page was written by
.An Alfred Perlstein .