PRIOCNTLSET(2) System Calls PRIOCNTLSET(2)

NAME

priocntlset - generalized process scheduler control

SYNOPSIS

#include <sys/types.h>
#include <sys/procset.h>
#include <sys/priocntl.h>
#include <sys/rtpriocntl.h>
#include <sys/tspriocntl.h>
#include <sys/iapriocntl.h>
#include <sys/fsspriocntl.h>
#include <sys/fxpriocntl.h>

long priocntlset(procset_t *psp, int cmd, /* arg */ ...);

DESCRIPTION

The priocntlset() function changes the scheduling properties of
running processes. priocntlset() has the same functions as the
priocntl() function, but a more general way of specifying the set of
processes whose scheduling properties are to be changed.


cmd specifies the function to be performed. arg is a pointer to a
structure whose type depends on cmd. See priocntl(2) for the valid
values of cmd and the corresponding arg structures.


psp is a pointer to a procset structure, which priocntlset() uses to
specify the set of processes whose scheduling properties are to be
changed. The procset structure contains the following members:

idop_t p_op; /* operator connecting left/right sets */
idtype_t p_lidtype; /* left set ID type */
id_t p_lid; /* left set ID */
idtype_t p_ridtype; /* right set ID type */
id_t p_rid; /* right set ID */


The p_lidtype and p_lid members specify the ID type and ID of one
("left") set of processes; the p_ridtype and p_rid members specify
the ID type and ID of a second ("right") set of processes. ID types
and IDs are specified just as for the priocntl() function. The p_op
member specifies the operation to be performed on the two sets of
processes to get the set of processes the function is to apply to.
The valid values for p_op and the processes they specify are:

POP_DIFF
Set difference: processes in left set and not in right
set.


POP_AND
Set intersection: processes in both left and right sets.


POP_OR
Set union: processes in either left or right sets or
both.


POP_XOR
Set exclusive-or: processes in left or right set but not
in both.


The following macro, which is defined in <procset.h>, offers a
convenient way to initialize a procset structure:

#define setprocset(psp, op, ltype, lid, rtype, rid) \
(psp)->p_op = (op), \
(psp)->p_lidtype = (ltype), \
(psp)->p_lid = (lid), \
(psp)->p_ridtype = (rtype), \
(psp)->p_rid = (rid),

RETURN VALUES

Unless otherwise noted above, priocntlset() returns 0 on success.
Otherwise, it returns -1 and sets errno to indicate the error.

ERRORS

The priocntlset() function will fail if:

EAGAIN
An attempt to change the class of a process failed because
of insufficient resources other than memory (for example,
class-specific kernel data structures).


EFAULT
One of the arguments points to an illegal address.


EINVAL
The argument cmd was invalid, an invalid or unconfigured
class was specified, or one of the parameters specified was
invalid.


ENOMEM
An attempt to change the class of a process failed because
of insufficient memory.


EPERM
The {PRIV_PROC_PRIOCNTL} privilege is not asserted in the
effective set of the calling LWP.

The calling LWP does not have sufficient privileges to
affect the target LWP.


ERANGE
The requested time quantum is out of range.


ESRCH
None of the specified processes exist.

SEE ALSO

priocntl(1), priocntl(2)

April 1, 2008 PRIOCNTLSET(2)