Filter_RegisterPreFilter
FilterManager
» SWI Calls
» Filter_RegisterPreFilter
Filter_RegisterPreFilter
(SWI &42640)
| Entry | |
|---|---|
| R0 | Pointer to zero terminated filter name |
| R1 | Address of Pre Filter Code |
| R2 | Value to be passed to R12 |
| R3 | Task handle of task to which filter is applied, or 0 for all tasks |
| Exit |
|---|
| All registers preserved |
Use
The purpose of this call is to add a new filter to the list of pre-filters.
Notes
The address pointed to by R1 will be called with R12 equal to the value of R2, whenever the task whose handle is passed in R3 calls Wimp_Poll.
See Pre Filter Code for details of how the filter routine must behave.
See also
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