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Kind of - from the documentation, this about the return value (the file
descriptor)
"/-1/ *open()* was not successful. The /errno/ global variable is set to
indicate the error."
Now the first open file IS always zero - but the first one YOU will see
is either 0 or 3 - the former if you are in a batch environment, the
latter if you are interactive.
This is because, in an interactive environment, the system reserves file
descriptors 0, 1, & 2 for stdin (keyboard), stdout (display), and stderr
(diagnostic/error messages, also to display but separable), respectively.
HTH
Vern
On 3/12/2014 4:40 PM, Gqcy wrote:
will a valid file handle will be ZERO or greater?
(i.e. the FIRST open file will be ZERO)
a error condition is LESS THAN ZERO, correct?
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