NM and CM callable (differences noted below).
Enables or disables a user-written system trap handling
procedure.
Syntax |
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I*V I*
XSYSTRAP(plabel,oldplabel);
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 | NOTE:
Any user trap handler cannot perform a GOTO out of that
procedure. Performing an ESCAPE (Pascal) or completing the trap
handling procedure are the only valid ways to return. The state of
the process and the program results are not predictable after
a non-local GOTO statement. |
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Parameters |
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- plabel
(NM) 32-bit signed integer by value (required)
(CM) 16-bit signed integer by value (required)
Passes the external-type label of the trap handling procedure.
If the value is 0, the trap handler is disabled.
- oldplabel
(NM) 32-bit signed integer by reference (required)
(CM) 16-bit signed integer by reference (required)
Returns the plabel of the process's previous software library
trap handler. If no plabel was previously configured,
0 is returned.
Operation Notes |
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When a program begins execution, the user-written system trap
handler is disabled automatically.
When enabled by the XSYSTRAP intrinsic, and
subsequently activated by an error,
the user-written system trap handler assumes control.
The trap handler can be enabled or disabled by calling
the XSYSTRAP intrinsic.
Condition Codes |
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- CCE (2)
Request granted. Trap enabled.
- CCG (0)
Request granted. Trap disabled.
- CCL (1)
Request denied. An illegal plabel was specified.
Related Information |
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- Intrinsics
None
- Commands
None
- Manuals
Trap Handling Programmer's Guide (32650-90026)
