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Re: File Test

by AgentM (Curate)
on Apr 05, 2001 at 21:36 UTC ( #70177=note: print w/replies, xml ) Need Help??


in reply to File Test

Under UN*X? No. The big function would be making queries to either the FS or the kernel, depending on the OS.

Under MacOS? No problem. See Mac::MoreFiles. A function already exists to do that. (MacOS supports mandatoy file locking.)

Under AFS (AtheOS)? Node watching is supported and encouraged (cool stuff).

Under NFS? Too much chance for race conditions- no way.

Under VMS? I don't know.

Under Win32? I don't care.

If you come a across a situation where you need to know if a file is currently being used without some form of IPC, you're in bad shape- this is indicative of a poor design.

AgentM Systems nor Nasca Enterprises nor Bone::Easy nor Macperl is responsible for the comments made by AgentM. Remember, you can build any logical system with NOR.

Replies are listed 'Best First'.
Re: Re: File Test
by Anonymous Monk on Apr 05, 2001 at 22:58 UTC
    Under UNIX, you could parse the output of the lsof program (if available).
[reply]
      What happens when someone else starts reading the file while you are parsing lsof's output? Or stops reading it, for that matter.

      --
      $you = new YOU;
      honk() if $you->love(perl)

[reply]

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