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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 .\" .Dd March 10, 1995 .Dt QUOTACTL 2 .Os .Sh NAME .Nm quotactl .Nd manipulate filesystem quotas .Sh SYNOPSIS .Fd #include .Fd #include .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 Currently quotas are supported only for the ``ufs'' filesystem. For ``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 and group identifiers. The ``ufs'' specific commands are: .Bl -tag -width Q_QUOTAON .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 (defined in .Ao Pa ufs/quota.h Ac ) . .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 (defined in .Ao Pa ufs/quota.h Ac ) . 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 (defined in .Ao Pa ufs/quota.h Ac ) . 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. .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 ENAMETOOLONGAA .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 .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 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 , 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 .