minix/lib/libc/sys/quotactl.2
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

213 lines
5.9 KiB
Groff

.\" $NetBSD: quotactl.2,v 1.26 2010/05/31 12:16:20 njoly Exp $
.\"
.\" Copyright (c) 1983, 1990, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\" This code is derived from software contributed to Berkeley by
.\" Robert Elz at The University of Melbourne.
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.\" @(#)quotactl.2 8.2 (Berkeley) 3/10/95
.\"
.Dd October 9, 2008
.Dt QUOTACTL 2
.Os
.Sh NAME
.Nm quotactl
.Nd manipulate filesystem quotas
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In ufs/ufs/quota.h
.Ft int
.Fn quotactl "const char *path" "int cmd" "int id" "void *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 ``ffs''
and ``lfs'' filesystem.
For both of them,
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 ``ffs'' and ``lfs'' 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
.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 .
.Fa addr
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 call is restricted to the super-user.
.It Dv Q_SETUSE
Set disk 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
.In ufs/ufs/quota.h ) .
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 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
.Fa cmd
or the command type is invalid.
.It Bq Er EACCES
In
.Dv Q_QUOTAON ,
the quota file is not a plain file, or
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
.Brq Dv NAME_MAX
characters, or an entire path name exceeded
.Brq 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
.Fa path
points outside the process's allocated address space, or
an invalid
.Fa addr
was supplied; the associated structure could not be copied in or out
of the kernel.
.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
function 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 .