Annotation of wikisrc/projects/project/binary_compat_puffs_backend.mdwn, revision 1.1

1.1     ! jmmv        1: [[!template id=project
        !             2: 
        !             3: title="Binary compatibility for puffs backend"
        !             4: 
        !             5: contact="""
        !             6: [tech-kern](mailto:tech-kern@NetBSD.org), [tech-userlevel](mailto:tech-userlevel@NetBSD.org)
        !             7: """
        !             8: 
        !             9: mentors="""
        !            10: [Antti Kantee](mailto:pooka@NetBSD.org)
        !            11: """
        !            12: 
        !            13: duration="3 months"
        !            14: 
        !            15: description="""
        !            16: Currently, the [puffs(3)](http://netbsd.gw.com/cgi-bin/man-cgi?puffs+3+NetBSD-5.1+i386) interface between the kernel and userspace uses various system structures for passing information. Examples are `struct stat` and `struct uucred`. If these change in layout (such as with the recent time_t size change), old puffs servers must be recompiled.
        !            17: 
        !            18: The purpose of the project is to:
        !            19: 
        !            20: * *define* a binary-independent protocol
        !            21: * *implement* support
        !            22: * *measure* the performance difference with direct kernel struct passing
        !            23: * if there is a huge difference, *investigate* the possibility for having both an internal and external protocol. The actual decision to include support will be made on the relative complexity of the code for dual support.
        !            24: 
        !            25: While this project will be partially implemented in the kernel, it is fairly well-contained and prior kernel experience is not necessary.
        !            26: 
        !            27: If there is time and interest, a suggested subproject is making sure that [p2k(3)](http://netbsd.gw.com/cgi-bin/man-cgi?p2k+3+NetBSD-5.1+i386) does not suffer from similar issues. This is a required subproject if dual support as mentioned above is not necessary.
        !            28: """
        !            29: ]]
        !            30: 
        !            31: [[!tag gsoc]]
        !            32: [[!tag medium]]
        !            33: [[!tag kernel]]

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