2.3.11. - Cleanup Macros
On keyboard interrupts (and command and syntax errors),
if macros named
cleanup
or
cleanup1 have been defined,
their definitions are read as input.
Typical uses of the
cleanup macro are to return motors to starting positions
and/or to insert comments in data files
after aborted scans.
After running the
cleanup and/or
cleanup1 macros, spec gives the standard prompt and waits for the next
command from the keyboard.
If there is another
^C interrupt or
error while the commands contained in the
cleanup or
cleanup1 macros are being executed, the macro definitions are removed.
As of release 4.03.13, the additional
cleanup_once and
cleanup_always macro names are recognized.
Each, if defined, will be pushed on to the input stream on
^C interrupts and command and syntax errors, as above.
The
cleanup_once definition, though, is
always removed before the next main prompt is issued.
On the other hand, the
cleanup_always definition will never be automatically removed.
Definitions for these macros
should be constructed using the
cdef()
(chained macro) function (described
2.4.4.1
)
in order to allow various clean-up actions to
be added and removed during the flow of arbitrary statement blocks.
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