quotactl man page on OpenDarwin

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

NAME
     quotactl — manipulate filesystem quotas

SYNOPSIS
     #include <sys/quota.h>   /* for disk 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 "ffs" and "hfs" filesystems.
     A command is composed of a primary command (see below) and a command type
     used to interpret the id.	Types are supported for interpretation of user
     identifiers and group identifiers.	 The 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 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 filesystem specified by path.
		  The command type specifies the type of the quotas being dis‐
		  abled.  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.

     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.	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.	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.

     Q_QUOTASTAT  Get the enable status for the filesystem specified by path.
		  The command type specifies the type of the quotas whose sta‐
		  tus is being queried.	 Addr is a pointer to an integer.
		  Upon return, this integer will hold a zero value if quotas
		  for the given type are not enabled and a non-zero value if
		  quotas for the given type are enabled.  The id parameter is
		  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.

     [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 a pathname exceeded {NAME_MAX} charac‐
			ters, or an entire path name exceeded {PATH_MAX} char‐
			acters.

     [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
			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				 June 4, 1993				   BSD
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