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The Question is:
I so far, have been unsuccessful in finding a way to pass error information
between OpenVMS & OpenM. i.e. A VMS command procedure calls a MUMPS routine
which errors (for whatever reason <UNDEFINED> or any other) when control is
returned to the command pr
ocedure, we would like to know whether or not the M routine completed or
errored. Could you shed some light on this matter as to the feasibility?
Thanks for your help.
The Answer is :
Please first check the MUMPS product documentation -- the OpenVMS Wizard
is not familiar with the "OpenM" product.
Per the OpenVMS Calling Standard, the error status (condition value)
is returned from calls via register R0, and may also be (or alternately)
returned via an OpenVMS Signal. On OpenVMS, a successful condition value
has the low bit set.
In the case of DSM, if DSM detects an error status (the low bit is clear)
returning from a call, then a MUMPS error is then "signalled", and an
error is returned to the user program in the $ZE special variable. Also
please see the $ZTRAP support for declaring an error handler in DSM.
Depending on the particular environment, it may be easier to create
jacket routines -- either to establish a handler and then capture the
signal arising from within the called routine, or to reorganize the
arguments and returns. From DSM, this jacket routine would be the
target of a ZCALL.
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