IBM 5100 - Page 170

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RETURN CODES
Return codes assigned to the shared variable when doing input/output operations
indicate whether
or not the operation was successful. If the return code is non-
zero
and MSG=OFF was not specified, an error message is also displayed.
Operation
of the system does not stop when a nonzero return code is assigned.
Therefore, if you have a user-defined function that is doing input/output opera-
tions, the user-defined function should check the return code
that was assigned
to the shared variable to make sure each operation is successful. When you are check-
ing the return code, the shared variable cannot
be referred to more than once.
Following
is a description and/or user's response for each return code and error
message:
Code Error Message
00
1 eee
20 INVALID FILE
30
INVALID DEVICE
or
INVALID DEVICE NUMBER
40 INVALID FILE NUMBER
50
NOT WITH OPEN DEVICE
60 INVALID PARAMETER
70 WS FULL
80 DEVICE NOT OPEN
Description and/or User's Response
Operation successful.
Device error; the second element
(eee) is the error code (see
ERROR eee ddd in Chapter 11).
The specified file cannot
be used
for input/output operations.
Enter the information required
to
open the file again, using device
number 1 or 2.
Enter the information required
to
open the file again, using a valid
file number.
The specified device
is already being
used for input/output operations;
the existing open file must
be closed
before another file
can be opened.
The information required
to open
the file
was entered incorrectly;
enter
it again, correcting any key-
ing errors.
Use the )ERASE command to erase
any unwanted objects; then enter
the information required
to open
the file again.
Open the file.