How to aviod a process from deleting an opened file

From: murthy (vanjina_murthy_at_rediffmail.com)
Date: 07/29/04

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    Date: 28 Jul 2004 21:32:02 -0700

    I am developing an application using C

    I am facing a problem , when a file is opened by one process either in
    read/write mode using open function , at the same time the other
    process can delete the same file using unlink function.

    What i want is that if a file is opened by one process either for
    reading/writing it should not be deleted or even can be opened by
    other process(i.e open should fail). Anyone knows, how it can
    achieved.

    The purpose is that i want to open a file in exclusive mode.

    Thanks in adavance

    Murthy

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