The following paragraph in timerfd_create looks confusing to me:
The flags argument is either 0, to start a relative timer
(new_value.it_interval specifies a time relative to the current value
of the clock specified by clockid), or TFD_TIMER_ABSTIME, to start an
absolute timer (new_value.it_interval specifies an absolute time for
the clock specified by clockid; that is, the timer will expire when the
value of that clock reaches the value specified in new_value.it_inter-
val).
The way I parse this, it makes more sense if the flags argument actually
applies to the it_value field, the field that sets the initial timer
expiration, rather than it_interval, the periodic timer expiration duration.
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