MIOS [Revelation On-Line Wiki]

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====== MIOS ======

When inputting or outputting data in CTO, it is possible to “intercept” and modify the data before it is processed by the normal CTO routines.  This MIOS (Modified I/O System) is therefore comparable to OpenInsight’s MFS (Modified Filing System).  Possible uses of this feature might be to implement i/o redirection, support for alternative input sources, or additional logging of output.  To use this functionality, you must create a routine (or routines) that have the following parameters:

 

SUBROUTINE <routinename>(<code>,<mios chain>,<param1>,<param2>,<param3>,<param4>,<param5>,<param6>,<param7>,<param8>,<flag>)

 

Where the parameters are:

<code>:       
-1 = before input;
0 = input;
1 = before print;
2 = print

<mios chain>:
Subvalue mark delimited list of other mios routines.

<param1> …:
Parameters passed into DO_INPUT or DO_PRINT (depending on wheter this is –1/0 or 1/2 code)

<flag>:
Set by the invoked MIOS routine.  0 indicates failure, any other value indicates success

 

You must specify that you want this routine invoked by calling SET_MIOS.  SET_MIOS “attaches” your routine to the input/output chain of events.  SET_MIOS has the following syntax:

 

SET_MIOS <routinename>,<calltype>

 

Calltype must be one of the following values:

 

1 – Add this routine to the end of the input/output chain

2 – Add this routine to the beginning of the input/output chain

3 – Add this routine to the front of the input/output chain (same as 2)

4 – Set this routine as the only routine in the input/output chain

5 – Remove this routine from the input/output chain

6 – Remove all routines from the input/output chain

 

Note that you must invoke SET_MIOS each time you log in to your application; therefore, you may wish to add this call to your LOGON proc or paragraph.