From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon, 8 Feb 2016 21:38:46 +0000 (-0500)
Subject: Fix: handle negative clock offset
X-Git-Tag: v2.8.0-rc1~35
X-Git-Url: http://git.lttng.org/?a=commitdiff_plain;h=dcb93448766003b5d8d19a57e2dd44efa8ea0035;hp=dcb93448766003b5d8d19a57e2dd44efa8ea0035;p=lttng-modules.git

Fix: handle negative clock offset

In the unlikely situation where a system sets its hardware clock
(CLOCK_REALTIME) to 0 (Epoch) after boot, the difference

  monotonic - realtime

becomes negative.

Fixup this situation by returning a 0 offset in this case.

This ensures that trace viewer implementations (e.g. babeltrace) which
currently cannot handle the negative offset (known bug) still work with
the generated traces.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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