Fix: add "flush empty" ioctl for stream intersection
authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Thu, 11 May 2017 20:50:50 +0000 (16:50 -0400)
committerMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Thu, 11 May 2017 21:49:04 +0000 (17:49 -0400)
commit67e891fbe09d8bf262c8aefe15467446a20721db
tree7c50af37ac60ebbe13f3f8b34fdd8511b11de0a4
parent618235ee8c9c72a7b0590d7fc58681760d569cec
Fix: add "flush empty" ioctl for stream intersection

Changing the behavior of the "snapshot" lttng command to implicitly do a
buffer "flush" (even when current packet is empty) had unwanted
side-effects: for instance, the snapshot ABI is used by the live timer
to grab the buffer positions, and we don't want to generate useless
empty packets in that scenario.

Therefore, add the "flush empty" behavior as a new ioctl to the ring
buffer. This allows lttng-tools to perform buffer flush (even for empty
packets) when it needs to. Given that this new ioctl is added within
stable branches as well, lttng-tools always need to handle "-ENOSYS"
gracefully.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
lib/ringbuffer/frontend_internal.h
lib/ringbuffer/ring_buffer_frontend.c
lib/ringbuffer/ring_buffer_vfs.c
lib/ringbuffer/vfs.h
lttng-abi.c
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