Terminal Session 33
Recovering from an error
these errors while the user is running it. In response to errors of this kind,
Model 204 does the following:
1. Immediately stops the current request
2. Logs the user out
3. Closes all open files
4. Displays the message:
*** M204.1024: USER RESTARTED
The Model 204 connection is maintained and the user can log in again.
Sometimes the user can resume the same operation that was being performed
when the error occurred. However, if a file was being updated at that time, the
physically inconsistent indicator is set (file status parameter FISTAT = X’02’)
and Model 204 displays the message:
*** M204.1221: FILE IS PHYSICALLY INCONSISTENT
The file structure might be damaged and the file manager must correct the
damage before the user can proceed.
Unless a file is marked physically inconsistent as the result of an error
condition, a user restart affects only the user who encountered the error.
Soft restart
Certain errors result in a user restart condition but do not physically damage the
file. Errors in this category usually occur when the terminal line is dropped or
when another terminal I/O problem occurs. Model 204 stops the request, logs
the user out, and displays the message:
*** M204.1024: USER RESTARTED SOFTLY
The physically inconsistent indicator is not set in this case. However, if the user
was executing an updating request, the logically inconsistent indicator (FISTAT
= X’40’) can be set. If this happens, the following message is displayed when
the file is opened again:
*** M204.0623: filename MAY BE LOGICALLY INCONSISTENT
The user can proceed to use the file, but the file manager should be notified so
that the consistency of the data can be verified and the FISTAT parameter can
be reset.
Displaying messages
When a prompting, informational, or error message is displayed by Model 204,
a prefix associated with the message specifies the type of message (that is,
Model 204 or user) and the number of the message. The system manager can
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