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6.1 SCM Status Codes

Function: err? x ¶

Return x if a valid error code (-1 … MAXERR); else #f.

Function: success? x ¶

Not err?.

constant: success ¶

Successful execution (0).

Negative integers are used for errors according to increasingly severity, as follows:

constant: notpres ¶

Successful execution, no data present or no change made

constant: terminated ¶

Failure, no damage, caller can retry operation

constant: retryerr ¶

Failure, no damage, caller can retry operation

constant: keyerr ¶

Failure, no damage, call was in error

constant: argerr ¶

Failure, no damage, call was in error

constant: noroom ¶

Failure, no damage, out of room in file.

constant: typerr ¶

Failure, file or object was not of correct type.

constant: ioerr ¶

I/O error, DB may be damaged.

constant: strangerr ¶

Internal error, DB may be damaged.

constant: unkerr ¶

Placeholder code.

constant: maxerr ¶

All error codes are between 0 and maxerr.