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TEXT_-15976_Trap Help.txt
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Trap Definitions
Note: Traps are the mechanism for programmers to access system functions.
The three different formats for listing traps are all derived from the Traps
file which is part of MPW. This file lists the “official” Mac traps along
with the names which they have been assigned. This list is incomplete for
two main reasons: some traps were left out by mistake and some were left
out on purpose because they are subject to change in the future. Generally,
this information is only of significant interest to programmers.
Unavailable Traps : This lists those “official” traps that for various reasons
are not available on your combination of hardware and software. They are
listed in the following format:
$Trap Number in Hex = _TrapName
Note: The [address] listed in the following two formats may either be the
the original address as shipped by Apple or may represent changes that
were made by various INITs, control panels, etc.
Available Traps (Named): This lists “official” traps available to your
machine in the following format:
$Trap Number in Hex = _TrapName [$Address of trap in hex]
Available Traps (UnNamed): This lists unofficial but active traps on your
machine in the format following. Since some traps point to the same
code, one can compare the addresses to determine which are duplicates.
Duplicate is really not the correct term as Traps which point to the
same code are generally variations of the original trap. For example,
_SetFilType shows the same address at $A043, $A243, and $A443.
This occurs because, in the case of this type of trap, the $A243
version means to execute the $A043 command immediately, and the
$A443 version means to execute the command asynchronously.
Different kinds of traps (e.g. Memory, File, Device, etc.) have similar
variations with different meanings.
$Trap Number in Hex [$Address of trap in hex]