Fix: Propagate filter status of kernel events to client

[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c

diff --git a/src/bin/lttng-sessiond/cmd.c b/src/bin/lttng-sessiond/cmd.c
index ffff05809d2f072cd6c40ea00f83dec07fad5f56..e1fbf769cbfb2833ecd98dc6b2f168e98f71dd4b 100644 (file)
--- a/src/bin/lttng-sessiond/cmd.c
+++ b/src/bin/lttng-sessiond/cmd.c
@@ -380,6 +380,8 @@ static int list_lttng_kernel_events(char *channel_name,
                strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
                (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
                (*events)[i].enabled = event->enabled;
+               (*events)[i].filter =
+                               (unsigned char) !!event->filter_expression;
 
                switch (event->event->instrumentation) {
                case LTTNG_KERNEL_TRACEPOINT:
@@ -1497,6 +1499,9 @@ static int _cmd_enable_event(struct ltt_session *session,
        assert(event);
        assert(channel_name);
 
+       /* If we have a filter, we must have its filter expression */
+       assert(!(!!filter_expression ^ !!filter));
+
        DBG("Enable event command for event \'%s\'", event->name);
 
        ret = validate_event_name(event->name);
@@ -1726,7 +1731,7 @@ static int _cmd_enable_event(struct ltt_session *session,
                if (!agt) {
                        agt = agent_create(domain->type);
                        if (!agt) {
-                               ret = -LTTNG_ERR_NOMEM;
+                               ret = LTTNG_ERR_NOMEM;
                                goto error;
                        }
                        agent_add(agt, usess->agents);
@@ -1738,7 +1743,7 @@ static int _cmd_enable_event(struct ltt_session *session,
                uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
                default_event_name = event_get_default_agent_ust_name(domain->type);
                if (!default_event_name) {
-                       ret = -LTTNG_ERR_FATAL;
+                       ret = LTTNG_ERR_FATAL;
                        goto error;
                }
                strncpy(uevent.name, default_event_name, sizeof(uevent.name));
@@ -1769,26 +1774,40 @@ static int _cmd_enable_event(struct ltt_session *session,
 
                {
                        struct lttng_filter_bytecode *filter_copy = NULL;
+                       char *filter_expression_copy = NULL;
 
                        if (filter) {
                                filter_copy = zmalloc(
                                        sizeof(struct lttng_filter_bytecode)
                                        + filter->len);
                                if (!filter_copy) {
+                                       ret = LTTNG_ERR_NOMEM;
                                        goto error;
                                }
 
                                memcpy(filter_copy, filter,
-                                       sizeof(struct lttng_filter_bytecode)
-                                       + filter->len);
+                                      sizeof(struct lttng_filter_bytecode)
+                                      + filter->len);
+                       }
+
+                       if (filter_expression) {
+                               filter_expression_copy =
+                                               strdup(filter_expression);
+                               if (!filter_expression) {
+                                       ret = LTTNG_ERR_NOMEM;
+                                       goto error_free_copy;
+                               }
                        }
 
                        ret = cmd_enable_event_internal(session, &tmp_dom,
                                        (char *) default_chan_name,
-                                       &uevent, filter_expression, filter_copy,
-                                       NULL, wpipe);
-                       /* We have passed ownership */
-                       filter_expression = NULL;
+                                       &uevent, filter_expression_copy,
+                                       filter_copy, NULL, wpipe);
+                       filter_copy = NULL;
+                       filter_expression_copy = NULL;
+error_free_copy:
+                       free(filter_copy);
+                       free(filter_expression_copy);
                }
 
                if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
@@ -1797,10 +1816,12 @@ static int _cmd_enable_event(struct ltt_session *session,
 
                /* The wild card * means that everything should be enabled. */
                if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
-                       ret = event_agent_enable_all(usess, agt, event, filter);
+                       ret = event_agent_enable_all(usess, agt, event, filter,
+                                       filter_expression);
                        filter = NULL;
                } else {
-                       ret = event_agent_enable(usess, agt, event, filter);
+                       ret = event_agent_enable(usess, agt, event, filter,
+                                       filter_expression);
                        filter = NULL;
                }
                if (ret != LTTNG_OK) {