On Sun, 31 Dec 2006 06:28:46 -0800, Paul Pluzhnikov wrote:
> Mike - EMAIL IGNORED <[EMAIL PROTECTED]> writes:
>
>> In the code fragment below, I would have expected a
>> failure on the second open,
>
> Why would you expect that?
>
>> I would like to generate a failure. How can I do this?
>
> Use O_EXCL (which exists *just* for that purpose).
>
>> The file is usually, but not always
>> present before the program is run.
>
I think not. From man 2 open:
O_EXCL When used with O_CREAT, if the file already exists it is an
error and the open will fail. In this context, a symbolic
link exists, regardless of where its points to.
Since in my case, a preexisting file does not mean a failure, this
will not serve unless I use a second "locking file". I quick test
has verified this. If, in the above, the word "exists" were changed
to "opened", my purpose would be served.
[...]
Mike.
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