quotactl man page on 4.4BSD

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

NAME
     quotactl — manipulate filesystem quotas

SYNOPSIS
     #include <ufs/quota.h>   /* for ufs quotas */

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

DESCRIPTION
     The quotactl() call enables, disables and manipulates filesystem quotas.
     A quota control command given by cmd operates on the given filename path
     for the given user id.  The address of an optional command specific data
     structure, addr, may be given; its interpretation is discussed below with
     each command.

     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 id.  Types are supported for interpre‐
     tation of user identifiers and group identifiers.	The ``ufs'' specific
     commands are:

     Q_QUOTAON	Enable disk quotas for the filesystem specified by path.  The
		command type specifies the type of the quotas being enabled.
		The addr argument specifies a file from which to take the quo‐
		tas.  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 filesystem 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.	 Addr
		is a pointer to a struct dqblk structure (defined in
		⟨ufs/quota.h⟩).

     Q_SETQUOTA
		Set disk quota limits for the user or group (as determined by
		the command type) with identifier id.  Addr is a pointer to a
		struct dqblk structure (defined in ⟨ufs/quota.h⟩).  The usage
		fields of the dqblk structure are ignored.  This 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.  Addr is a pointer to a
		struct dqblk structure (defined in ⟨ufs/quota.h⟩).  Only the
		usage fields are used.	This 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 parameters are ignored.

RETURN VALUES
     A successful call returns 0, otherwise the value -1 is returned and the
     global variable errno indicates the reason for the failure.

ERRORS
     A quotactl() call will fail if:

     [EOPNOTSUPP]    The kernel has not been compiled with the QUOTA option.

     [EUSERS]	     The quota table cannot be expanded.

     [EINVAL]	     Cmd or the command type is invalid.

     [EINVAL]	     A pathname contains a character with the high-order bit
		     set.

     [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 characters,
		     or the entire length of either path name exceeded 1023
		     characters.

     [ENOENT]	     A filename does not exist.

     [ELOOP]	     Too many symbolic links were encountered in translating a
		     pathname.

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

     [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]	     Path points outside the process's allocated address
		     space.

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

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

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

HISTORY
     The quotactl function call appeared in 4.3BSD-Reno.

BSD				March 10, 1995				   BSD
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