.\"	$NetBSD: quotactl.2,v 1.8 1995/02/27 12:35:43 cgd Exp $
.\"
.\" Copyright (c) 1983, 1990, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Robert Elz at The University of Melbourne.
.\"
.\" 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.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
.\"
.\"	@(#)quotactl.2	8.1 (Berkeley) 6/4/93
.\"
.Dd June 4, 1993
.Dt QUOTACTL 2
.Os
.Sh NAME
.Nm quotactl
.Nd manipulate filesystem quotas
.Sh SYNOPSIS
.Fd #include <sys/types.h>	/* types needed by quota.h */
.Fd #include <sys/quota.h>	/* for disk quotas */
.Ft int
.Fn quotactl "const char *path" "int cmd" "int id" "char *addr"
.Sh DESCRIPTION
The
.Fn quotactl
call enables, disables and
manipulates filesystem quotas.
A quota control command
given by
.Fa cmd
operates on the given filename
.Fa path
for the given user
.Fa id .
The address of an optional command specific data structure,
.Fa addr ,
may be given; its interpretation
is discussed below with each command.
.Pp
A command is composed of a primary command (see below)
and a command type used to interpret the
.Fa id .
Types are supported for interpretation of user identifiers
and group identifiers.
The specific commands are:
.Bl -tag -width Q_QUOTASTAT
.It Dv Q_QUOTAON
Enable disk quotas for the filesystem specified by
.Fa path .
The command type specifies the type of the quotas being enabled.
The
.Fa addr
argument specifies a file from which to take the quotas.
The quota file must exist;
it is normally created with the 
.Xr quotacheck 8
program.
The
.Fa id
argument is unused.
Only the super-user may turn quotas on.
.It Dv Q_QUOTAOFF
Disable disk quotas for the filesystem specified by
.Fa path .
The command type specifies the type of the quotas being disabled.
The
.Fa addr
and
.Fa id
arguments are unused.
Only the super-user may turn quotas off.
.It Dv Q_GETQUOTA
Get disk quota limits and current usage for the user or group
(as determined by the command type) with identifier
.Fa id .
.Fa Addr
is a pointer to a
.Fa struct dqblk
structure.
.It Dv Q_SETQUOTA
Set disk quota limits for the user or group
(as determined by the command type) with identifier
.Fa id .
.Fa Addr
is a pointer to a
.Fa struct dqblk
structure.
The usage fields of the
.Fa dqblk
structure are ignored.
This call is restricted to the super-user.
.It Dv Q_SETUSE
Set disk usage limits for the user or group
(as determined by the command type) with identifier
.Fa id .
.Fa Addr
is a pointer to a
.Fa struct dqblk
structure.
Only the usage fields are used.
This call is restricted to the super-user.
.It Dv Q_SYNC
Update the on-disk copy of quota usages.
The command type specifies which type of quotas are to be updated.
The
.Fa id
and
.Fa addr
parameters are ignored.
.It Dv Q_QUOTASTAT
Get the enable status for the filesystem specified by
.Fa path .
The command type specifies the type of the quotas whose
status is being queried.
.Fa Addr
is a pointer to an integer.  Upon return,
this integer will hold a zero value if quotas for the
given type are not enabled and a non-zero value if
quotas for the given type are enabled.
The
.Fa id
parameter is ignored.
.El
.Sh RETURN VALUES
A successful call returns 0,
otherwise the value -1 is returned and the global variable
.Va errno
indicates the reason for the failure.
.Sh ERRORS
A
.Fn quotactl
call will fail if:
.Bl -tag -width Er
.It Bq Er ENOTSUP
The kernel has not been compiled with the
.Dv QUOTA
option.
.It Bq Er EUSERS
The quota table cannot be expanded.
.It Bq Er EINVAL
.Fa Cmd
or the command type is invalid.
.It Bq Er EACCES
In
.Dv Q_QUOTAON ,
the quota file is not a plain file.
.It Bq Er EACCES
Search permission is denied for a component of a path prefix.
.It Bq Er ENOTDIR
A component of a path prefix was not a directory.
.It Bq Er ENAMETOOLONG
A component of a pathname exceeded 
.Dv {NAME_MAX}
characters, or an entire path name exceeded 
.Dv {PATH_MAX}
characters.
.It Bq Er ENOENT
A filename does not exist.
.It Bq Er ELOOP
Too many symbolic links were encountered in translating a pathname.
.It Bq Er EROFS
In
.Dv Q_QUOTAON ,
the quota file resides on a read-only filesystem.
.It Bq Er EIO
An
.Tn I/O
error occurred while reading from or writing
to a file containing quotas.
.It Bq Er EFAULT
An invalid
.Fa addr
was supplied; the associated structure could not be copied in or out
of the kernel.
.It Bq Er EFAULT
.Fa Path
points outside the process's allocated address space.
.It Bq Er EPERM
The call was privileged and the caller was not the super-user.
.El
.Sh SEE ALSO
.Xr quota 1 ,
.Xr fstab 5 ,
.Xr edquota 8 ,
.Xr quotacheck 8 ,
.Xr quotaon 8 ,
.Xr repquota 8
.Sh BUGS
There should be some way to integrate this call with the resource
limit interface provided by
.Xr setrlimit 2
and
.Xr getrlimit 2 .
.Sh HISTORY
The
.Fn quotactl
function call appeared in
.Bx 4.3 Reno .