GDSX Manual

Design and Development
Extended General Device Support (GDSX) Manual–134303
2-52
DEVICEINFO
to 0, and if TSCODE detects a fault or a file error specified in debug^error^trap (bits
0-7) or in the TRAPERROR configuration parameter, then TSCODE sends a message
with the fault number or file error number to the home terminal. USCODE is also free
to use this flag for application-specific purposes.
Backup^debug^flag
Backup^debug^flag is used to indicate that DEBUG is to be called in the backup
process. If this flag is set to 1, DEBUG is called in the backup process immediately
following process creation. You can then set breakpoints as desired. From then on, a
GDSX process enters DEBUG only if an I/O error occurs during a write to the backup
process. The process does not time out on I/O operations to the backup process.
Poolcheck^flag
Poolcheck^flag is used to indicate whether memory pools should be checked when tasks
are dispatched. If poolcheck^flag is set, each time a task is dispatched TSCODE checks
the buffer pool, message pool, extended buffer pool, and extended message pool for
corruption. This pool checking is in addition to that always done when the
GETLOCALPOOL and GETEXTPOOL procedures are called. If corruption is
detected, GDSX stops with abend error 230 or 231. The poolcheck^flag can be set
when debugging a program and turned off during production to allow GDSX to run
more efficiently.
Debug^fatal^flag
Debug^fatal^flag is used to indicate that TSCODE is to invoke DEBUG if any fatal error
is detected.
DEVICEINFO
Because GDSX runs as a subtype 30 process, it receives DEVICEINFO (-40) system
messages when external applications call the file-system DEVICEINFO and
DEVICEINFO2 procedures. This dynamic parameter determines how TSCODE
responds to external processes issuing a DEVICEINFO or DEVICEINFO2 on the SUs
under the GDSX process. Also, when this parameter is set, SCF accepts
DEVICETYPE, DEVICESUBTYPE, and PHYSRECLEN attributes defined for SUs or
LINEs.
Regardless of the setting of DEVICEINFO, if GDSX receives a DEVICEINFO message
requesting information about the GDSX process itself, TSCODE replies with device
type 57 (for the GDSX process), subtype 0, and physical record length 132. See the
logic box diagram below.
Internal DEFINE Name CONFIG^PARAMS Name Default Value Range
support^devinfo device^info 0 (OFF) 0–1