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Effect of TFRCTL on overrides-Scenario<br />
The TFRCTL command replaces one program with another program at the same<br />
call level. The program to which control is transferred runs at the same call level as<br />
the program that contained the TFRCTL command. An override command in a<br />
program that transfers control to another program is not deleted during the<br />
transfer of control. In the following example, program A transfers control to<br />
program B, and program B runs in the same call level as program A. The Override<br />
with Database <strong>File</strong> (OVRDBF) command causes the file to be positioned at the last<br />
record of the member when it is opened and is used for both programs A and B.<br />
CALL PGM(A)<br />
Program A<br />
OVRDBF FILE(INPUT) POSITION(*END)<br />
(INPUT is opened and positioned at the last<br />
record of the member and closed after<br />
processing.)<br />
TFRCTLPGM(B)<br />
Program B<br />
(INPUT is opened and positioned at the last<br />
record of the member.)<br />
Overrides to the same file at the same call level: scenario 1<br />
When you enter two overrides for the same file name at the same call level, the<br />
second override replaces the first override. This allows you to replace an override<br />
at a single call level, without having to delete the first override (see “Deleting<br />
overrides” on page 54). For example:<br />
Override 1 OVRDKTF FILE(QDKTSRC) LABEL(X)<br />
CALL PGM(REORDER)<br />
Override 2 OVRDKTF FILE(QDKTSRC) LABEL(Y)<br />
CALL PGM(REORDER)<br />
Assume that program REORDER uses the diskette file QDKTSRC. Override 1<br />
causes the first call to program REORDER to use the source file with a label of X<br />
for its processing. Override 2 causes the second call to program REORDER to use<br />
the source file with a label of Y for its processing.<br />
Overrides to the same file at the same call level: scenario 2<br />
When you enter two overrides for the same file name at the same call level, the<br />
second override replaces the first override.<br />
In the following example, when the program attempts to open FILE A, FILE B<br />
overrides FILE A because of override 2. Because only one override can be applied<br />
for each call level, the system ignores override 1, and the file opened by the<br />
program is FILE B.<br />
Chapter 3. Using overrides 49
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