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quota(2) [bsd man page]

QUOTA(2)							System Calls Manual							  QUOTA(2)

NAME
quota - manipulate disk quotas SYNOPSIS
#include <sys/quota.h> quota(cmd, uid, arg, addr) int cmd, uid, arg; char *addr; DESCRIPTION
The quota call manipulates disk quotas for file systems that have had quotas enabled with setquota(2). The cmd parameter indicates a com- mand to be applied to the user ID uid. Arg is a command specific argument and addr is the address of an optional, command specific, data structure that is copied in or out of the system. The interpretation of arg and addr is given with each command below. Q_SETDLIM Set disc quota limits and current usage for the user with ID uid. Arg is a major-minor device indicating a particular file system. Addr is a pointer to a struct dqblk structure (defined in <sys/quota.h>). This call is restricted to the super-user. Q_GETDLIM Get disc quota limits and current usage for the user with ID uid. The remaining parameters are as for Q_SETDLIM. Q_SETDUSE Set disc usage limits for the user with ID uid. Arg is a major-minor device indicating a particular file system. Addr is a pointer to a struct dqusage structure (defined in <sys/quota.h>). This call is restricted to the super-user. Q_SYNC Update the on-disc copy of quota usages. Arg is a major-minor device indicating the file system to be sync'ed. If the arg parame- ter is specified as NODEV, all file systems that have disc quotas will be sync'ed. The uid and addr parameters are ignored. Q_SETUID Change the calling process's quota limits to those of the user with ID uid. The arg and addr parameters are ignored. This call is restricted to the super-user. Q_SETWARN Alter the disc usage warning limits for the user with ID uid. Arg is a major-minor device indicating a particular file system. Addr is a pointer to a struct dqwarn structure (defined in <sys/quota.h>). This call is restricted to the super-user. Q_DOWARN Warn the user with user ID uid about excessive disc usage. This call causes the system to check its current disc usage information and print a message on the terminal of the caller for each file system on which the user is over quota. If the user is under quota, his warning count is reset to MAX_*_WARN (defined in <sys/quota.h>). If the arg parameter is specified as NODEV, all file systems that have disc quotas will be checked. Otherwise, arg indicates a specific major-minor device to be checked. This call is restricted to the super-user. RETURN VALUE
A successful call returns 0, otherwise the value -1 is returned and the global variable errno indicates the reason for the failure. ERRORS
A quota call will fail when one of the following occurs: [EINVAL] The kernel has not been compiled with the QUOTA option. [EINVAL] Cmd is invalid. [ESRCH] No disc quota is found for the indicated user. [EPERM] The call is priviledged and the caller was not the super-user. [ENODEV] The arg parameter is being interpreted as a major-minor device and it indicates an unmounted file system. [EFAULT] An invalid addr is supplied; the associated structure could not be copied in or out of the kernel. [EUSERS] The quota table is full. SEE ALSO
setquota(2), quotaon(8), quotacheck(8) BUGS
There should be some way to integrate this call with the resource limit interface provided by setrlimit(2) and getrlimit(2). The Australian spelling of disk is used throughout the quota facilities in honor of the implementors. 4.2 Berkeley Distribution May 15, 1986 QUOTA(2)

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

NAME
quotactl -- manipulate filesystem quotas SYNOPSIS
#include <sys/types.h> /* types needed by quota.h */ #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. 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 disabled. 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 status 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: [ENOTSUP] 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} characters, or an entire path name exceeded {PATH_MAX} characters. [ENOENT] A filename does not exist. [ELOOP] Too many symbolic links were encountered in translating 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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