CA Dynam for VSE User Guide

Controlling System Actions
Note that the SYSxxx:
• Physical assignment is not changed within the system; a replacement
DTFCN is generated to control the SYSLOG I/O.
• I/O intercepts remain in effect for the duration of the VSE job unless reset
by another ASSGN for SYSxxx to a device other than SYSLOG. For
example:
// ASSGN SYSIPT,SYSIPT or // ASSGN SYSIPT,x'00E'
If you want SYSLOG support in subsequent jobs, you must reissue the
following:
// ASSGN SYSxxx,SYSLOG
SYSLOG
Input Data
Indicates that all DTFs with the logical unit specified for SYSxxx will have their
I/O operations rerouted to or from SYSLOG. For this action to be effective, you
must formally OPEN the file and initiate all I/O with logical IOCS imperative
macros. You should also use a CLOSE macro.
All SYSIPT read requests are preceded by a prompting message with the
following format:
CADF099D dtfname SYSIPT:
SYSIPT input data is converted to uppercase before being passed to the
requesting program. You can signal end-of-data for SYSIPT files by either
entering the EOD characters /* or by entering null data (simply pressing the
ENTER key without typing any characters). By entering null data, the running
program will react as if /* had been entered.
Output Data
All SYSPCH and SYSLST writes to SYSLOG have the data line prefixed by:
D/FI-SYSLST: or,
D/FI-SYSPCH:
If the combined length of this prefix (13 characters) plus the length of the
data is greater than 256 characters, the data portion of the line will be
truncated to this maximum. If the combined length exceeds the length of one
console/screen line, wraparound will occur.
You can route the output of a DTFMT or DTFSD to the console (if the output is
in displayable characters). The following example shows how to do this.
// DLBL FILEOUT,,,,SYSPCH
ASSGN SYSPCH,SYSLOG
CA Dynam/FI first overrides the DTFSD logical unit with SYSPCH. The second
line reroutes SYSPCH output to SYSLOG.
Chapter 6: Controlling File Independence 6–29