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    SubjectRe: [linux-pm] [PATCH 2/9] PM: suspend_block: Add driver to access suspend blockers from user-space
    On Mon, 26 Apr 2010, Arve Hjønnevåg wrote:

    > > If you insist on using ioctl for init, you should use the standard
    > > convention for passing variable-length data.  The userspace program
    > > sets up a fixed-size buffer containing a pointer to the name and the
    > > name's length, and it passes the buffer's address as the ioctl
    > > argument.
    > Are you sure that is the standard? I searched for ioctls with NAME in
    > their name and only found one that passed the name that way. The rest
    > used fixed length string buffers, or passed the buffersize to _IOC
    > like I do. For instance, input.h has ioctls to read string and
    > bitmasks where user space specify the buffer size as an argument to
    > the ioctl macro. These pass data from the kernel to user space, but I
    > don't passing a string length is any worse than passing a buffer size.

    You're right. Okay, I withdraw my objection.

    Alan Stern

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