At 3/1/2012 06:46 PM, Skip Robinson wrote:
For years we ran a 'channel extender' product call RDS. It worked by
front-endng FLIH for I/O interrupts to determine whether the I/O was
to or from a supported device as defined to RDS. If not, the I/O was
passed along for normal processing. If so, RDS redirected the I/O to
its own network device for transmission (out); or written to the
intended device (in). It sounds kludgy, but it worked amazingly
well. The vendor was very forthright about the internals. We had
occasional hardware problems with RDS, but I never once saw an OS
failure caused by this technique.
This sort of thing is best not done at home.
This also is a example of a "legitimate" use of an intercept. It does
not confer authority upon its caller. All it does is perform a
service on behalf of a caller and which the caller itself does not
have the authority to perform on its own. In this sense it is no
different from any other system service (OPEN, WTO, GETMAIN, etc.)
performed by the OS.
JO.Skip Robinson
SCE Infrastructure Technology Services
Electric Dragon Team Paddler
SHARE MVS Program Co-Manager
626-302-7535 Office
323-715-0595 Mobile
[email protected]
Dave Cole REPLY TO: [email protected]
ColeSoft Marketing WEB PAGE: http://www.colesoft.com
736 Fox Hollow Road VOICE: 540-456-8536
Afton, VA 22920 FAX: 540-456-6658
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