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 5.10 14 June 2004 quotactl(7I)
Check Out this Related Man Page
QUOTACTL(2) BSD System Calls Manual QUOTACTL(2)NAME
quotactl -- manipulate file system quotas
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h>
#include <ufs/ufs/quota.h>
int
quotactl(const char *path, int cmd, int id, void *addr);
DESCRIPTION
The quotactl() system call enables, disables and manipulates file system quotas. A quota control command given by cmd operates on the given
filename path for the given user or group id. (NOTE: One should use the QCMD macro defined in <ufs/ufs/quota.h> to formulate the value for
cmd.) The address of an optional command specific data structure, addr, may be given; its interpretation is discussed below with each com-
mand.
For commands that use the id identifier, it must be either -1 or any positive value. The value of -1 indicates that the current UID or GID
should be used. Any other negative value will return an error.
Currently quotas are supported only for the ``ufs'' file system. 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 interpretation of user identifiers (USRQUOTA) and group identifiers
(GRPQUOTA). The ``ufs'' specific commands are:
Q_QUOTAON Enable disk quotas for the file system 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 file system 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_GETQUOTASIZE Get the wordsize used to represent the quotas for the user or group (as determined by the command type). Possible values
are 32 for the old-style quota file and 64 for the new-style quota file. The addr argument is a pointer to an integer into
which the size is stored. The identifier id is not used.
Q_GETQUOTA Get disk quota limits and current usage for the user or group (as determined by the command type) with identifier id. The
addr argument is a pointer to a struct dqblk structure (defined in <ufs/ufs/quota.h>).
Q_SETQUOTA Set disk quota limits for the user or group (as determined by the command type) with identifier id. The addr argument is a
pointer to a struct dqblk structure (defined in <ufs/ufs/quota.h>). The usage fields of the dqblk structure are ignored.
This system 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. The addr argument is a
pointer to a struct dqblk structure (defined in <ufs/ufs/quota.h>). Only the usage fields are used. This system 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 arguments are ignored.
RETURN VALUES
The quotactl() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi-
cate the error.
ERRORS
The quotactl() system call will fail if:
[EOPNOTSUPP] The kernel has not been compiled with the QUOTA option.
[EUSERS] The quota table cannot be expanded.
[EINVAL] The cmd argument or the command type is invalid. In Q_GETQUOTASIZE, Q_GETQUOTA, Q_SETQUOTA, and Q_SETUSE, quotas are not
currently enabled for this file system.
The id argument to Q_GETQUOTA, Q_SETQUOTA or Q_SETUSE is a negative value.
[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, either the file system on which quotas are to be enabled is mounted read-only or the quota file resides on a
read-only file system.
[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] The path argument 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)HISTORY
The quotactl() system call appeared in 4.3BSD-Reno.
BUGS
There should be some way to integrate this call with the resource limit interface provided by setrlimit(2) and getrlimit(2).
BSD March 5, 1999 BSD