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NetBSD 6.1.5 - man page for __quotactl (netbsd section 2)

__QUOTACTL(2)			     BSD System Calls Manual			    __QUOTACTL(2)

     __quotactl -- manipulate file system quotas

     Standard C Library (libc, -lc)

     #include <sys/quota.h>
     #include <sys/quotactl.h>

     __quotactl(const char *path, struct quotactl_args *args);

     The __quotactl() call manipulates file system quotas.  This is an internal interface and is
     documented for reference purposes only.  All application and utility code should use the
     libquota(3) interface.

     The __quotactl() function performs one of several quota-related operations on the file sys-
     tem named by path.  The operation and arguments to that operation are passed in the args
     argument.	The operation is stored in the qc_op member of args.  The arguments are placed in
     a union such that the first and second arguments of the operation QUOTACTL_EXAMPLE are found
     as the members u.example.qc_arg1 and u.example.qc_arg2.  The descriptions below will refer
     to the operations as functions of the form QUOTACTL_EXAMPLE(int arg1, int arg2) and elide
     the encoding of these arguments into the args structure.  Explicit mention of the path argu-
     ment is also omitted.

     There are fourteen quota control operations.  These are:

     QUOTACTL_STAT(struct quotastat *info)
	     Information about the quota implementation on the selected volume is returned in
	     info.  The quotastat structure contains the following members:

	     qs_implname      A human-readable string describing the underlying implementation of
			      quotas.  This is suitable for display to users (and system
			      administrators) but should not be interpreted by software.  See

	     qs_numidtypes    The number of ID types supported by this implementation.	See

	     qs_numobjtypes   The number of object types supported by this implementation.  See

	     qs_restrictions  Flags identifying specific semantic limitations of the implementa-
			      tion.  See quota_getrestrictions(3).

     QUOTACTL_IDTYPESTAT(int idtype, struct quotaidtypestat *info)
	     Information about a particular ID type on the selected volume is returned in info.
	     The quotaidtypestat structure contains the following members:

	     qis_name	      The name of the ID type.	See quota_idtype_getname(3).

     QUOTACTL_OBJYPESTAT(int objtype, struct quotaobjtypestat *info)
	     Information about a particular object type on the selected volume is returned in
	     info.  The quotaobjtypestat structure contains the following members:

	     qos_name	      The name of the object type.  See quota_objtype_getname(3).

	     qos_isbytes      A flag that is nonzero if the object type is something measured in
			      bytes.  See quota_objtype_isbytes(3).

     QUOTACTL_GET(const struct quotakey *key, struct quotaval *val)
	     Return in val the quota information selected by key.  See quota_get(3).

     QUOTACTL_PUT(const struct quotakey *key, const struct quotaval *val)
	     The quota information selected by key is updated to the values provided in val.
	     Note that the current usage information, which is file system meta-data, cannot be
	     updated via this interface.  If the usage information is incorrect a tool such as
	     fsck(8) or quotacheck(8) with file-system-specific knowledge must be used to repair
	     the on-disk information.  See quota_put(3).

     QUOTACTL_DELETE(const struct quotakey *key)
	     The quota information selected by key is removed.	See quota_delete(3).

     QUOTACTL_CURSOROPEN(struct quotakcursor *cursor)
	     A cursor for iterating the quota information is created.  The quotakcursor structure
	     is a semi-opaque type holding the iteration state used by the quota implementation.
	     The caller is responsible for allocating and maintaining storage for the cursor.
	     Every cursor that is opened should be closed.  It is not specified whether a cursor
	     remains valid if memcpy(3) is used to move it to a different location in user mem-
	     ory.  It is not specified whether or how a cursor may be duplicated.  Passing an
	     uninitialized, corrupted, or closed cursor to operations other than
	     QUOTACTL_CURSOROPEN() will produce unspecified behavior.  As per general standards
	     for system calls such actions must not produce undefined or materially adverse
	     behavior in the kernel; however, the effect on a user process may be arbitrary.  The
	     libquota(3) interface wraps the system call level quota cursors in a friendlier
	     interface.  See quota_opencursor(3).

     QUOTACTL_CURSORCLOSE(struct quotakcursor *cursor)
	     The cursor passed in is closed.  See quotacursor_close(3).

     QUOTACTL_CURSORSKIPIDTYPE(struct quotakcursor *cursor, int idtype)
	     This operation provides a hint that iteration can skip over a particular ID type.
	     The implementation is not obliged to honor the hint.  See quotacursor_skipidtype(3).

     QUOTACTL_CURSORGET(struct quotakcursor *cursor, struct quotakey *keys, struct quotaval
	     *vals, unsigned maxnum, unsigned *ret)
	     This operation retrieves data at the current cursor position and advances it.  Up to
	     maxnum quota records are retrieved and stored into the arrays named by keys and
	     vals.  The number of records retrieved is stored into the variable pointed to by
	     ret.  See quotacursor_get(3) and quotacursor_getn(3).

     QUOTACTL_CURSORATEND(struct quotakcursor *cursor, int *ret)
	     This operation generates a nonzero value if the cursor has reached the end of the
	     available quota information and zero otherwise.  The generated value is stored into
	     the variable pointed to by ret.  See quotacursor_atend(3).

     QUOTACTL_CURSORREWIND(struct quotakcursor *cursor)
	     This operation updates the cursor state so that further calls to
	     QUOTACTL_CURSORGET() will begin again at the start of the iteration.  See

     QUOTACTL_QUOTAON(int idtype, const char *quotafile)
	     This operation is accepted only by old-style (``quota1'') quota implementations.
	     Quotas for the ID type named by idtype are switched on, and the file quotafile is
	     used to hold the quota information.  This operation can also be used when quotas are
	     already switched on to change the file used to hold the quota information.  Note
	     however that as the current usage information in the file must be consistent with
	     the current state of the file system, in general it is not safe to call
	     QUOTACTL_QUOTAON() except in single-user mode.  See quotaon(8) for more information.
	     Normally quotaon 8 is run during the boot sequence after quotacheck 8 .  Also see

     QUOTACTL_QUOTAOFF(int idtype)
	     This operation is accepted only by old-style (``quota1'') quota implementations.
	     Quotas for the ID type named by idtype are switched off.  Once quotas are switched
	     off the file system behaves as if no quotas are present.  Normally quotaoff 8 is run
	     during the shutdown sequence.  Also see quota_quotaoff(3).

     On success, __quotactl() returns 0.  Otherwise the value -1 is returned and an error code
     reflecting the reason for the failure is placed in errno.

     __quotactl() failures include:

     [EFAULT]		A pointer points outside the process's allocated address space.

     [EINVAL]		The operation code was out of range; or a requested ID or object type was
			out of range; or a corrupted or invalid cursor was passed in.

     [ENODEV]		The requested action was inappropriate for (or not supported by) the
			selected volume.

     [ENOENT]		No quota information exists for the requested key.

     [ENOMEM]		Memory could not be allocated within the kernel.

     [ENXIO]		The target file system type is capable of supporting quotas, but quotas
			are not enabled on the selected volume.

     [EOPNOTSUPP]	The target file system does not support quotas.

     quota(1), libquota(3), fstab(5), edquota(8), quotacheck(8), quotaon(8), quotarestore(8),

     The original quotactl() function call appeared in 4.3BSD-Reno.  The current __quotactl()
     interface appeared in NetBSD 6.0.

     As of this writing the error returns that occur in practice are not always completely con-
     sistent with the intent documented above.

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

BSD					February 11, 2012				      BSD

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