psdanger Subroutine
Purpose
Defines the amount of free paging space available.
Syntax
#include <signal.h>
#include <sys/vminfo.h>int Signal;
Description
The psdanger subroutine returns the difference between the current number of free paging-space blocks and the paging-space thresholds of the system.
Parameters
| Item | Description |
|---|---|
| Signal | Defines the signal. |
Return Values
If the value of the Signal parameter is 0, the return value is the total number of paging-space blocks defined in the system.
If the value of the Signal parameter is -1, the return value is the number of free paging-space blocks available in the system.
If the value of the Signal parameter is SIGDANGER, the return value is the difference between the current number of free paging-space blocks and the paging-space warning threshold. If the number of free paging-space blocks is less than the paging-space warning threshold, the return value is negative.
If the value of the Signal parameter is SIGKILL, the return value is the difference between the current number of free paging-space blocks and the paging-space kill threshold. If the number of free paging-space blocks is less than the paging-space kill threshold, the return value is negative.