quotactl(7I) Ioctl Requests quotactl(7I)NAMEquotactl - 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
structure 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/func‐
tion definitions and defines
SEE ALSOquota(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 5.10 14 June 2004 quotactl(7I)
