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QUOTACTL(2)		    BSD	System Calls Manual		   QUOTACTL(2)

NAME
     quotactl -- manipulate file system	quotas

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <sys/types.h>
     #include <ufs/ufs/quota.h>

     int
     quotactl(const char *path,	int cmd, int id, void *addr);

DESCRIPTION
     The quotactl() system call	enables, disables and manipulates file system
     quotas.  A	quota control command given by cmd operates on the given file-
     name path for the given user or group id.	(NOTE: One should use the QCMD
     macro defined in <ufs/ufs/quota.h>	to formulate the value for cmd.)  The
     address of	an optional command specific data structure, addr, may be
     given; its	interpretation is discussed below with each command.

     For commands that use the id identifier, it must be either	-1 or any pos-
     itive value.  The value of	-1 indicates that the current UID or GID
     should be used.  Any other	negative value will return an error.

     Currently quotas are supported only for the "ufs" file system.  For
     "ufs", a command is composed of a primary command (see below) and a com-
     mand type used to interpret the id.  Types	are supported for interpreta-
     tion of user identifiers (USRQUOTA) and group identifiers (GRPQUOTA).
     The "ufs" specific	commands are:

     Q_QUOTAON	   Enable disk quotas for the file system specified by path.
		   The command type specifies the type of the quotas being en-
		   abled.  The addr argument specifies a file from which to
		   take	the quotas.  The quota file must exist;	it is normally
		   created with	the quotacheck(8) program.  The	id argument is
		   unused.  Only the super-user	may turn quotas	on.

     Q_QUOTAOFF	   Disable disk	quotas for the file system specified by	path.
		   The command type specifies the type of the quotas being
		   disabled.  The addr and id arguments	are unused.  Only the
		   super-user may turn quotas off.

     Q_GETQUOTA	   Get disk quota limits and current usage for the user	or
		   group (as determined	by the command type) with identifier
		   id.	The addr argument is a pointer to a struct dqblk
		   structure (defined in <ufs/ufs/quota.h>).

     Q_SETQUOTA	   Set disk quota limits for the user or group (as determined
		   by the command type)	with identifier	id.  The addr argument
		   is a	pointer	to a struct dqblk structure (defined in
		   <ufs/ufs/quota.h>).	The usage fields of the	dqblk struc-
		   ture	are ignored.  This system call is restricted to	the
		   super-user.

     Q_SETUSE	   Set disk usage limits for the user or group (as determined
		   by the command type)	with identifier	id.  The addr argument
		   is a	pointer	to a struct dqblk structure (defined in
		   <ufs/ufs/quota.h>).	Only the usage fields are used.	 This
		   system call is restricted to	the super-user.

     Q_SYNC	   Update the on-disk copy of quota usages.  The command type
		   specifies which type	of quotas are to be updated.  The id
		   and addr arguments are ignored.

RETURN VALUES
     The quotactl() function returns the value 0 if successful;	otherwise the
     value -1 is returned and the global variable errno	is set to indicate the
     error.

ERRORS
     The quotactl() system call	will fail if:

     [EOPNOTSUPP]	The kernel has not been	compiled with the QUOTA	op-
			tion.

     [EUSERS]		The quota table	cannot be expanded.

     [EINVAL]		The cmd	argument or the	command	type is	invalid.  In
			Q_GETQUOTA and Q_SETQUOTA, quotas are not currently
			enabled	for this file system.

			The id argument	to Q_GETQUOTA, Q_SETQUOTA or Q_SETUSE
			is a negative value.

     [EACCES]		In Q_QUOTAON, the quota	file is	not a plain file.

     [EACCES]		Search permission is denied for	a component of a path
			prefix.

     [ENOTDIR]		A component of a path prefix was not a directory.

     [ENAMETOOLONG]	A component of either pathname exceeded	255 charac-
			ters, or the entire length of either path name ex-
			ceeded 1023 characters.

     [ENOENT]		A filename does	not exist.

     [ELOOP]		Too many symbolic links	were encountered in translat-
			ing a pathname.

     [EROFS]		In Q_QUOTAON, the quota	file resides on	a read-only
			file system.

     [EIO]		An I/O error occurred while reading from or writing to
			a file containing quotas.

     [EFAULT]		An invalid addr	was supplied; the associated structure
			could not be copied in or out of the kernel.

     [EFAULT]		The path argument points outside the process's allo-
			cated address space.

     [EPERM]		The call was privileged	and the	caller was not the su-
			per-user.

SEE ALSO
     quota(1), fstab(5), edquota(8), quotacheck(8), quotaon(8),	repquota(8)

HISTORY
     The quotactl() system call	appeared in 4.3BSD-Reno.

BUGS
     There should be some way to integrate this	call with the resource limit
     interface provided	by setrlimit(2)	and getrlimit(2).

BSD				 March 5, 1999				   BSD

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY | BUGS

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