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    SubjectRe: [linux-pm] [PATCH 0/8] Suspend block api (version 8)
    > Could we have write(powerstate_fd, "qos",3) block until all
    > QOS_EVENTUALLY constraints are lifted or the system successfully
    > suspends and resumes or a signal arrives?

    Yes - and you can then use alarm() or similar to do timeouts (or write
    the timeout to the fd ?)

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