How to determine what process(es) is(are) locking a file?

This is a discussion on How to determine what process(es) is(are) locking a file? within the C Programming forums, part of the General Programming Boards category; I have a Java application that uses java.nio.channels.FileLock to obtain a lock on a file. But unfortunately the API does ...

  1. #1
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    How to determine what process(es) is(are) locking a file?

    I have a Java application that uses java.nio.channels.FileLock to obtain a lock on a file. But unfortunately the API does not provide a method to determine when the lock is unsuccessful what process(es) is(are) locking the file. So I am trying to do this using JNI and C, but I have not had any luck finding source code to do this. Does anyone know how to do this? It's only necessary to work with a Windows(XP and up) environment.

  2. #2
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    Ok, so the first question would be what platform this is implemented on.

    Since the lock is a "OS" lock, the "other" locking process may not be a Java process at all, so any information (possibly) heald by the Java code itself is pretty much useless.

    In Windows, you can use Mark Russinovich's "Process Explorer" to find which process has a particular file open [it won't tell you if the file is locked or not, AFAIK]. www.sysinternals.com is Mark's website, but it appears that the site is now run by Microsoft.

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    Mats
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    As stated before, this is for a Windows Environment (XP/Server 2003 mostly). I can not use a third party application, because I need to be able to determine what process(es) is(are) locking the file to send a message to the user through logs. I need to know how, using C code, to determine what process(es) is(are) locking a file.

  4. #4
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    Well, there's no published API from Windows to "interrogate" the file-locking data, so that's not going to be easy to achieve.

    Of course, if you are in control of the file-locking [as in, it's YOUR java code], you could implement a "extension" method for the original FileLock in java, that stores [somehow, perhaps in a file?] which process/user is locking which file.

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    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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    I need to know how, using C code, to determine what process(es) is(are) locking a file.
    CreateToolHelp32Snapshot

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