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SDFI, SDFO–System Data Format I/O Routines
21.3. Error Return
When SDFI or SDFO takes the error return, register A4 contains an error code. For
some error codes, register A5 contains additional information. The error codes are as
follows:
00
01
04
05
06
07
Unrecoverable I/O error; A5 contains the status code (see the Exec ER Programming
Reference Manual).
Error on ER TLBL$ tape label call; A5 contains the status code (see the Exec ER
Programming Reference Manual).
(SDFI entry point SDFINT$ only) The record that is read is larger than the image
buffer; the record has been truncated. The recommended image buffer word length
is returned in A5. Place the length and address of a larger image buffer in the packet
and call SDFI$ again to read the entire image.
(SDFI entry point SDFINT$ only) A continuation control record (051) made the total
record length exceed the image buffer length; the record has been truncated. The
recommended image buffer word length is returned in A5, and the word length of
the partial image transferred is in S2 of word 10 for control records, and T1 of word
10 for data records. Another call to SDFI$ will continue reading the image.
(SDFI entry points SDFI$ and SDFINT$) A continuation control record (051) made the
total record length exceed the maximum allowed word length (63 for control records,
2047 for data records).
(SDFO entry point SDFOC$ only) The code for the equipment type is zero. Either
SDFO has not been opened correctly or the SDFO packet has been corrupted.
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