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-.\" 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.
-.\"
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-.\" 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. 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	8.2 (Berkeley) 3/10/95
-.\" $FreeBSD$
-.\"
-.Dd March 30, 2020
-.Dt QUOTACTL 2
-.Os
-.Sh NAME
-.Nm quotactl
-.Nd manipulate file system quotas
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/types.h
-.In ufs/ufs/quota.h
-.Ft int
-.Fn quotactl "const char *path" "int cmd" "int id" "void *addr"
-.Sh DESCRIPTION
-The
-.Fn quotactl
-system call enables, disables and
-manipulates file system quotas.
-A quota control command
-given by
-.Fa cmd
-operates on the given filename
-.Fa path
-for the given user or group
-.Fa id .
-(NOTE: One should use the QCMD macro defined in
-.In ufs/ufs/quota.h
-to formulate the value for
-.Fa cmd . )
-The address of an optional command specific data structure,
-.Fa addr ,
-may be given; its interpretation
-is discussed below with each command.
-.Pp
-For commands that use the
-.Fa id
-identifier, it must be either -1 or any positive value.
-The value of -1 indicates that the current UID or GID should be used.
-Any other negative value will return an error.
-.Pp
-Currently quotas are supported only for the
-.Dq ufs
-file system.
-For
-.Dq ufs ,
-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 (USRQUOTA)
-and group identifiers (GRPQUOTA).
-The
-.Dq ufs
-specific commands are:
-.Bl -tag -width Q_GETQUOTASIZEx
-.It Dv Q_QUOTAON
-Enable disk quotas for the file system 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 file system 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_GETQUOTASIZE
-Get the wordsize used to represent the quotas for the user or group
-(as determined by the command type).
-Possible values are 32 for the old-style quota file
-and 64 for the new-style quota file.
-The
-.Fa addr
-argument is a pointer to an integer into which the size is stored.
-The identifier
-.Fa id
-is not used.
-.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 .
-The
-.Fa addr
-argument
-is a pointer to a
-.Fa struct dqblk
-structure (defined in
-.In ufs/ufs/quota.h ) .
-.It Dv Q_SETQUOTA
-Set disk quota limits for the user or group
-(as determined by the command type) with identifier
-.Fa id .
-The
-.Fa addr
-argument
-is a pointer to a
-.Fa struct dqblk
-structure (defined in
-.In ufs/ufs/quota.h ) .
-The usage fields of the
-.Fa dqblk
-structure are ignored.
-This system 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 .
-The
-.Fa addr
-argument
-is a pointer to a
-.Fa struct dqblk
-structure (defined in
-.In ufs/ufs/quota.h ) .
-Only the usage fields are used.
-This system 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
-arguments are ignored.
-.El
-.Sh RETURN VALUES
-.Rv -std quotactl
-.Sh ERRORS
-The
-.Fn quotactl
-system call will fail if:
-.Bl -tag -width Er
-.It Bq Er EOPNOTSUPP
-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
-The
-.Fa cmd
-argument
-or the command type is invalid.
-In
-.Dv Q_GETQUOTASIZE ,
-.Dv Q_GETQUOTA ,
-.Dv Q_SETQUOTA ,
-and
-.Dv Q_SETUSE ,
-quotas are not currently enabled for this file system.
-.Pp
-The
-.Fa id
-argument to
-.Dv Q_GETQUOTA ,
-.Dv Q_SETQUOTA
-or
-.Dv Q_SETUSE
-is a negative value.
-.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 either pathname exceeded 255 characters,
-or the entire length of either path name exceeded 1023 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 ,
-either the file system on which quotas are to be enabled is mounted read-only
-or the quota file resides on a read-only file system.
-.It Bq Er EIO
-An
-.Tn I/O
-error occurred while reading from or writing
-to a file containing quotas.
-.It Bq Er EINTEGRITY
-Corrupted data was detected while reading from the file system.
-.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
-The
-.Fa path
-argument
-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 HISTORY
-The
-.Fn quotactl
-system call appeared in
-.Bx 4.3 Reno .
-.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 .