Cygwin: Introduce new LTTNG_UST_STREAM_PIPE command to open wakeup pipe

[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 5380450f643a31cce3fa3e2eb1bb8ca994fb20ff..5c66776d4901c42ed44b19a591f56c32f188147e 100644 (file)
--- a/src/bin/lttng-sessiond/ust-app.c
+++ b/src/bin/lttng-sessiond/ust-app.c
@@ -2055,6 +2055,31 @@ int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
                goto error_rcu_unlock;
        }
 
+       /* Ask UST to open the write side of the wait pipe */
+       DBG("Asking UST to open metadata stream wait pipe path: %s\n",
+           ua_sess->metadata->stream_obj->wait_pipe_path);
+
+       ret = ustctl_open_wait_pipe(app->sock, ua_sess->metadata->obj);
+
+       if (ret < 0) {
+               ERR("Asking UST to open wait_pipe failed");
+       }
+
+       /* each channel */
+       cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
+                               node.node) {
+
+               DBG("Asking UST to open channel wait pipe path: %s\n",
+                   ua_chan->obj->wait_pipe_path);
+
+               ret = ustctl_open_wait_pipe(app->sock, ua_chan->obj);
+
+               if (ret < 0) {
+                       ERR("Asking UST to open wait_pipe failed for wait pipe: %s",
+                           ua_chan->obj->wait_pipe_path);
+               }
+       }
+
 skip_setup:
        /* This start the UST tracing */
        ret = ustctl_start_session(app->sock, ua_sess->handle);