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Re: fstat, file_info and file_test [message #35073]

Thu, 15 May 2003 02:26

Nigel Wade
Messages: 286
Registered: March 1998

Senior Member

Ben Tupper wrote:

> Hello,
>
> This appears to be the week for file questions.
>
> I see that in the now distant past, my question has been asked here
> before, but the answers were pre-IDL 5.4 when FILE_xxxxx routines
> appeared.
>
> I would like to have a test that reports if the file is open - by simply
> providing the filename. FSTAT almost does it, but I have to associate
> the file with a LUN first. FILE_INFO and FILE_TEST each take the
> filename as an argument (instead of the lun that FSTAT requires), but
> neither test for 'openess'.
>
> What I would like to have is a function similar to:
>
> result = FILE_ISOPEN(filename)
>
> that returns a 1 (for open) or a 0 (for closed). Or, perhaps better in
> the long run, I'd like to see an /ISOPEN keyword added to FILE_TEST.
>
>
> Any suggestions?
>
> Thanks,
> Ben

How do you deal with the issue of the file being renamed or deleted after
you've opened it? What do you do if the file you opened is renamed and new
file created with the same name - should the test indicate it's open or
not?

In general, not even the OS can tell you reliably what you want for these
reasons.

--
Nigel Wade, System Administrator, Space Plasma Physics Group,
University of Leicester, Leicester, LE1 7RH, UK
E-mail : nmw@ion.le.ac.uk
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555

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[Message index]

		Re: fstat, file_info and file_test By: Nigel Wade on Thu, 15 May 2003 02:26
		Re: fstat, file_info and file_test By: Karsten Rodenacker on Thu, 15 May 2003 02:19
		Re: fstat, file_info and file_test By: btt on Wed, 14 May 2003 11:28
		Re: fstat, file_info and file_test By: btt on Wed, 14 May 2003 10:48
		Re: fstat, file_info and file_test By: Bruce Bowler on Wed, 14 May 2003 09:56
		Re: fstat, file_info and file_test By: Richard Younger on Wed, 14 May 2003 09:13
		Re: fstat, file_info and file_test By: Richard Younger on Fri, 16 May 2003 11:16
		Re: fstat, file_info and file_test By: btt on Thu, 15 May 2003 07:56

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