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Fix: report to client when snapshot will be empty
[lttng-tools.git]
/
src
/
bin
/
lttng-sessiond
/
ust-app.c
diff --git
a/src/bin/lttng-sessiond/ust-app.c
b/src/bin/lttng-sessiond/ust-app.c
index d1fa0d09cb2b04d75b3419cd6fa969a602253eb0..34d4c9b1558de816bd1935ba02eef50b1c90e511 100644
(file)
--- a/
src/bin/lttng-sessiond/ust-app.c
+++ b/
src/bin/lttng-sessiond/ust-app.c
@@
-4932,6
+4932,7
@@
int ust_app_snapshot_record(struct ltt_ust_session *usess,
struct snapshot_output *output, int wait, unsigned int nb_streams)
{
int ret = 0;
struct snapshot_output *output, int wait, unsigned int nb_streams)
{
int ret = 0;
+ unsigned int snapshot_done = 0;
struct lttng_ht_iter iter;
struct ust_app *app;
char pathname[PATH_MAX];
struct lttng_ht_iter iter;
struct ust_app *app;
char pathname[PATH_MAX];
@@
-5006,6
+5007,7
@@
int ust_app_snapshot_record(struct ltt_ust_session *usess,
if (ret < 0) {
goto error;
}
if (ret < 0) {
goto error;
}
+ snapshot_done = 1;
}
break;
}
}
break;
}
@@
-5073,6
+5075,7
@@
int ust_app_snapshot_record(struct ltt_ust_session *usess,
if (ret < 0) {
goto error;
}
if (ret < 0) {
goto error;
}
+ snapshot_done = 1;
}
break;
}
}
break;
}
@@
-5081,6
+5084,15
@@
int ust_app_snapshot_record(struct ltt_ust_session *usess,
break;
}
break;
}
+ if (!snapshot_done) {
+ /*
+ * If no snapshot was made and we are not in the error path, this means
+ * that there are no buffers thus no (prior) application to snapshot
+ * data from so we have simply NO data.
+ */
+ ret = -ENODATA;
+ }
+
error:
rcu_read_unlock();
return ret;
error:
rcu_read_unlock();
return ret;
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