Prolly a stupid basic UNIX programming question, but how do I tell
how many programs have a file open?
Basically, I need to know if a file is in use or not before I destructively
modify it.
Cheers,
-RK
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Robert Krten, PDP minicomputer collector http://www.parse.com/~pdp8/
Not POSIX, but QNX have a iofdinfo().
-xtang
Robert Krten <rk@parse.com> wrote in message
news:bv4flv$ffr$1@inn.qnx.com…
Prolly a stupid basic UNIX programming question, but how do I tell
how many programs have a file open?Basically, I need to know if a file is in use or not before I
destructively
modify it.Cheers,
-RK–
[If replying via email, you’ll need to click on the URL that’s emailed to
you
afterwards to forward the email to me – spam filters and all that]
Robert Krten, PDP minicomputer collector > http://www.parse.com/~pdp8/
Robert Krten <rk@parse.com> wrote:
Prolly a stupid basic UNIX programming question, but how do I tell
how many programs have a file open?
No POSIX way.
Basically, I need to know if a file is in use or not before I destructively
modify it.
unlink() the file.
open( O_CREAT) the same file.
Existing opens will keep a copy of the old file – you’ll get a new one.
-David
Cheers,
-RK–
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Robert Krten, PDP minicomputer collector > http://www.parse.com/~pdp8/
–
David Gibbs
dagibbs@qnx.com
David Gibbs <dagibbs@qnx.com> wrote:
Robert Krten <> rk@parse.com> > wrote:
Prolly a stupid basic UNIX programming question, but how do I tell
how many programs have a file open?No POSIX way.
Basically, I need to know if a file is in use or not before I destructively
modify it.unlink() the file.
open( O_CREAT) the same file.Existing opens will keep a copy of the old file – you’ll get a new one.
Thanks, Dave, but xtang’s suggestion is what I’m using now, because I
need to not unlink the file if it’s in use 
Cheers,
-RK
-David
David Gibbs
dagibbs@qnx.com
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