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)