freebsd-skq/share/man/man9/vfs_suser.9

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.\"
.\" Copyright (c) 2004 Alfred Perlstein
.\" All rights reserved.
.\"
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.\" $FreeBSD$
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.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
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.Fn vfs_suser "struct mount *mp" "struct thread *td"
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.Sh DESCRIPTION
The
.Fn vfs_suser
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function checks if the credentials given include superuser powers
for the given mount point.
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It will check to see if the thread
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passed in has the same credentials as the user that mounted the
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file system.
If so, it returns 0, otherwise it returns what
.Xr priv_check 9
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would have returned.
.Sh RETURN VALUES
The
.Fn vfs_suser
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function returns 0 if the user has superuser powers and
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.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
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.Sh HISTORY
The
.Fn vfs_suser
function was introduced in
.Fx 5.2 .
.Sh AUTHORS
This manual page was written by
.An Alfred Perlstein .