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    SubjectRe: [PATCH 2/8] PM: suspend_block: Add driver to access suspend blockers from user-space
    From
    2010/5/26 Peter Zijlstra <peterz@infradead.org>:
    > On Fri, 2010-05-21 at 15:46 -0700, Arve Hjønnevåg wrote:
    >> +To create a suspend blocker from user space, open the suspend_blocker
    >> special
    >> +device file:
    >> +
    >> +    fd = open("/dev/suspend_blocker", O_RDWR | O_CLOEXEC);
    >> +
    >> +then optionally call:
    >> +
    >> +    ioctl(fd, SUSPEND_BLOCKER_IOCTL_SET_NAME(strlen(name)), name);
    >> +
    >> +To activate the suspend blocker call:
    >> +
    >> +    ioctl(fd, SUSPEND_BLOCKER_IOCTL_BLOCK);
    >> +
    >> +To deactivate it call:
    >> +
    >> +    ioctl(fd, SUSPEND_BLOCKER_IOCTL_UNBLOCK);
    >> +
    >> +To destroy the suspend blocker, close the device:
    >> +
    >> +    close(fd);
    >
    > Urgh, please let the open() be BLOCK, the close() be UNBLOCK, and keep
    > the SET_NAME thing if you really care.
    >

    That would be very inefficient.

    --
    Arve Hjønnevåg
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