SetToolTrapAddress

SetToolTrapAddress Install custom code to replace an operating system routine

#include <OSUtils.h> Operating System Utilities

void SetToolTrapAddress (trapAddr, trapNum,);

long trapAddr ; address of custom code

short trapNum ; the trap to intercept. See TrapWords.

SetToolTrapAddress changes an element of the toolbox trap dispatch table

so that subsequent invocations of that trap will cause execution to go to a

specified address. Use this function (and not SetTrapAddress) if your

application will run in a Mac equipped with a ROM version later than the 64K

trapAddr is the address of some code to handle execution of a Toolbox function.

trapNum identifies the ROM routine you wish to replace. See TrapWords for a

list.

Notes: SetToolTrapAddress is part of a new interface to the routine

specification of the trap type as a parameter as NSetTrapAddress does.

called, depending on which trap dispatch table you wish to modify. It is

recommended that you use one of these routines in place of

tool traps and OS traps.

SetToolTrapAddress is used mostly by assembly-language programers .

It is most often used in device drivers of INIT code, rather an by an

application.

Note: Be sure to change all traps back to their original addresses before

your application exits!

The trap dispatcher changed between the 64K and 128K ROMs. For more

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