82855e9cf51c2276bda38af279c0f9a8bafce4cc
. don't loop doing a receive() after sendrec() - chance of recovering is not high, and can lead to receive()ing a notify() (which can't happen in sendrec()), which is terrible . return status from device when DEV_CANCEL is done on a signal; hardcode EAGAIN to become EINTR though
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