F.ERR - test for an error condition.

Usage:

B:
   status = f.err(unit [, clear]);

/* C users use "clearerr" and "ferror" */

Where:

unit

is the I/O unit to be tested.

clear

specifies if the error flag is to be cleared.

0

just query the state. This is the default.

1

clear the error indicator.

status

is the error number (errno) for the file. A non-zero value indicates an error.

Description:

F.ERR tests to see if an I/O unit is in an error state. It can also be used to clear the error indicator for the unit.

Notes:

Although F.ERR lets you clear the error flag, in many situations this will not be enough to allow continued processing of the file.

See Also:

expl b lib io.err

how to print out an error message for the unit.

Copyright © 1996, Thinkage Ltd.