quotactl(7I)							  Ioctl Requests						      quotactl(7I)

NAME

       quotactl - manipulate disk quotas

SYNOPSIS

       #include <sys/fs/ufs_quota.h>
       int ioctl(int fd, Q_QUOTACTL, struct quotcl *qp)

DESCRIPTION

       This  ioctl()  call  manipulates  disk  quotas.	fd is the file descriptor returned by the open() system call after opening the quotas file
       (located in the root directory of the filesystem running quotas.) Q_QUOTACTL is	defined  in  /usr/include/sys/fs/ufs_quota.h.  qp  is  the
       address of the quotctl structure which is defined as

	 struct quotctl {
	   int op;
	   uid_t uid;
	   caddr_t addr;
	 };

       op  indicates an operation to be applied to the user ID uid. (See below.) addr is the address of an optional, command specific, data struc-
       ture which is copied in or out of the system. The interpretation of addr is given with each value of op below.

       Q_QUOTAON     Turn on quotas for a file system. addr points to the full pathname of the quotas file. uid is ignored. It is recommended that
		     uid have the value of 0. This call is restricted to the super-user.

       Q_QUOTAOFF    Turn  off quotas for a file system. addr and uid are ignored. It is recommended that addr have the value of NULL and uid have
		     the value of 0. This call is restricted to the super-user.

       Q_GETQUOTA    Get  disk	quota  limits  and  current  usage  for  user  uid.  addr  is  a  pointer  to  a  dqblk  structure   (defined	in
		     <sys/fs/ufs_quota.h>). Only the super-user may get the quotas of a user other than himself.

       Q_SETQUOTA    Set disk quota limits and current usage for user uid. addr is a pointer to a dqblk structure (defined in sys/fs/ufs_quota.h).
		     This call is restricted to the super-user.

       Q_SETQLIM     Set disk quota limits for user uid. addr is a pointer to a dqblk structure (defined  in  sys/fs/ufs_quota.h).  This  call	is
		     restricted to the super-user.

       Q_SYNC	     Update the on-disk copy of quota usages for this file system. addr and uid are ignored.

       Q_ALLSYNC     Update the on-disk copy of quota usages for all file systems with active quotas. addr and uid are ignored.

RETURN VALUES

       This ioctl() returns:

       0	on success.

       -1	on failure and sets errno to indicate the error.

ERRORS

       EFAULT	 addr is invalid.

       EINVAL	 The kernel has not been compiled with the QUOTA option. op is invalid.

       ENOENT	 The quotas file specified by addr does not exist.

       EPERM	 The call is privileged and the calling process did not assert	       {PRIV_SYS_MOUNT} in the effective set.

       ESRCH	 No disk quota is found for the indicated user. Quotas have not been turned on for this file system.

       EUSERS	 The quota table is full.

       If op is Q_QUOTAON, ioctl() may set errno to:

       EACCES	 The  quota  file  pointed to by addr exists but is not a regular file. The quota file pointed to by addr exists but is not on the
		 file system pointed to by special.

       EIO	 Internal I/O error while attempting to read the quotas file pointed to by addr.

FILES

       /usr/include/sys/fs/ufs_quota.h

	   quota-related structure/function definitions and defines

SEE ALSO

       quota(1M), quotacheck(1M), quotaon(1M), getrlimit(2), mount(2)

BUGS

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

       This call is incompatible with Melbourne quotas.

SunOS 5.11							   14 June 2004 						      quotactl(7I)