From: mathieu.desnoyers@efficios.com (Mathieu Desnoyers)
Subject: [lttng-dev] [PATCH babeltrace-1.5 6/6] Fix: lttng-live format: do not error out on empty streams hang up
Date: Thu, 5 Dec 2019 01:58:09 -0500 [thread overview]
Message-ID: <20191205065809.16728-7-mathieu.desnoyers@efficios.com> (raw)
In-Reply-To: <20191205065809.16728-1-mathieu.desnoyers@efficios.com>
Attaching to a stream hung up before providing any trace packet
causes ctf_open_mmap_stream_read() to return an error.
This kind of scenario can happen with the upcoming "lttng clear"
feature.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
---
formats/ctf/ctf.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/formats/ctf/ctf.c b/formats/ctf/ctf.c
index 980ebc9a..1ba9017f 100644
--- a/formats/ctf/ctf.c
+++ b/formats/ctf/ctf.c
@@ -2571,8 +2571,13 @@ int ctf_open_mmap_stream_read(struct ctf_trace *td,
}
ret = prepare_mmap_stream_definition(td, file_stream, packet_seek);
- if (ret)
+ if (ret) {
+ /* We need to check for EOF here for empty files. */
+ if (unlikely(file_stream->pos.offset == EOF)) {
+ ret = 0;
+ }
goto error_index;
+ }
/*
* For now, only a single clock per trace is supported.
--
2.17.1
next prev parent reply other threads:[~2019-12-05 6:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-05 6:58 [lttng-dev] [PATCH babeltrace-1.5 0/6] Babeltrace 1.5 lttng-live with per-pid ust buffers Mathieu Desnoyers
2019-12-05 6:58 ` [lttng-dev] [PATCH babeltrace-1.5 1/6] Fix: lttng-live: use-after-free in get_next_index() Mathieu Desnoyers
2019-12-05 6:58 ` [lttng-dev] [PATCH babeltrace-1.5 2/6] Fix: trace-collection: trace clock use after free Mathieu Desnoyers
2019-12-05 6:58 ` [lttng-dev] [PATCH babeltrace-1.5 3/6] Fix: lttng-live: lttng_live_open_trace_read memory leak Mathieu Desnoyers
2019-12-05 6:58 ` [lttng-dev] [PATCH babeltrace-1.5 4/6] Fix: lib/iterator.c: unbalanced ctx put (leak) Mathieu Desnoyers
2019-12-05 6:58 ` [lttng-dev] [PATCH babeltrace-1.5 5/6] Fix: lttng-live: ctf_live_packet_seek stream hang up handling Mathieu Desnoyers
2019-12-05 6:58 ` Mathieu Desnoyers [this message]
2019-12-13 1:03 ` [lttng-dev] [PATCH babeltrace-1.5 6/6] Fix: lttng-live format: do not error out on empty streams hang up Jérémie Galarneau
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