Resource Control Flags and Properties

Each resource control available on the system has a certain set of properties that are associated with it. This set of properties is defined as a set of global flags, which are associated with all controlled instances of that resource. Global flags cannot be modified, but they can be retrieved by using either rctladm or the getrctl system call.

Local flags define the default behavior and configuration for a specific threshold value of that resource control on a specific process or process collective. The local flags for one threshold value do not affect the behavior of other defined threshold values for that same resource control. However, the global flags affect the behavior for every value that is associated with a particular control. Local flags can be modified, within the constraints that are supplied by their corresponding global flags, by the prctl command or the setrctl system call (see setrctl(2)).

For the complete list of local flags, global flags, and their definitions, see rctlblk_set_value(3C).

To determine system behavior when a threshold value for a particular resource control is reached, use rctladm to display the global flags for the resource control . For example, to display the values for process.max-cpu-time, type the following:

$ rctladm process.max-cpu-time
	process.max-cpu-time   syslog=off   [ lowerable no-deny cpu-time inf ]

The global flags indicate the following.

lowerable

Superuser privileges are not required to lower the privileged values for this control.

no-deny

Even when threshold values are exceeded, access to the resource is never denied.

cpu-time

SIGXCPU is available to be sent when threshold values of this resource are reached.

inf

Any value with RCTL_LOCAL_MAXIMAL defined actually represents an infinite quantity, and the value is never enforced.

Use prctl to display local values and actions for the resource control.

$ prctl -n process.max-cpu-time $$
	353939: -ksh
	process.max-cpu-time   [ lowerable no-deny cpu-time inf ]
		18446744073709551615 privileged signal=XCPU   [ max ]
		18446744073709551615 system     deny          [ max ]

The max (RCTL_LOCAL_MAXIMAL) flag is set for both threshold values, and the inf (RCTL_GLOBAL_INFINITE) flag is defined for this resource control. Hence, as configured, both threshold quantities represent infinite values and they are never exceeded.