lttng-ctl: move lttng_event functions to a new file

[lttng-tools.git] / src / lib / lttng-ctl / event.c

diff --git a/src/lib/lttng-ctl/event.c b/src/lib/lttng-ctl/event.c
new file mode 100644 (file)
index 0000000..541e371
--- /dev/null
+++ b/src/lib/lttng-ctl/event.c
@@ -0,0 +1,120 @@
+/*
+ * event.c
+ *
+ * Linux Trace Toolkit Control Library
+ *
+ * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License, version 2.1 only,
+ * as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#define _LGPL_SOURCE
+#include <lttng/event.h>
+#include <lttng/lttng-error.h>
+#include <stddef.h>
+#include <common/sessiond-comm/sessiond-comm.h>
+
+int lttng_event_get_filter_expression(struct lttng_event *event,
+       const char **filter_expression)
+{
+       int ret = 0;
+       struct lttcomm_event_extended_header *ext_header;
+
+       if (!event || !filter_expression) {
+               ret = -LTTNG_ERR_INVALID;
+               goto end;
+       }
+
+       ext_header = event->extended.ptr;
+
+       if (!ext_header) {
+               /*
+                * This can happen since the lttng_event structure is
+                * used for other tasks where this pointer is never set.
+                */
+               *filter_expression = NULL;
+               goto end;
+       }
+
+       if (ext_header->filter_len) {
+               *filter_expression = ((const char *) (ext_header)) +
+                               sizeof(*ext_header);
+       } else {
+               *filter_expression = NULL;
+       }
+
+end:
+       return ret;
+}
+
+int lttng_event_get_exclusion_name_count(struct lttng_event *event)
+{
+       int ret;
+       struct lttcomm_event_extended_header *ext_header;
+
+       if (!event) {
+               ret = -LTTNG_ERR_INVALID;
+               goto end;
+       }
+
+       ext_header = event->extended.ptr;
+       if (!ext_header) {
+               /*
+                * This can happen since the lttng_event structure is
+                * used for other tasks where this pointer is never set.
+                */
+               ret = 0;
+               goto end;
+       }
+
+       if (ext_header->nb_exclusions > INT_MAX) {
+               ret = -LTTNG_ERR_OVERFLOW;
+               goto end;
+       }
+       ret = (int) ext_header->nb_exclusions;
+end:
+       return ret;
+}
+
+int lttng_event_get_exclusion_name(struct lttng_event *event,
+               size_t index, const char **exclusion_name)
+{
+       int ret = 0;
+       struct lttcomm_event_extended_header *ext_header;
+       void *at;
+
+       if (!event || !exclusion_name) {
+               ret = -LTTNG_ERR_INVALID;
+               goto end;
+       }
+
+       ext_header = event->extended.ptr;
+       if (!ext_header) {
+               ret = -LTTNG_ERR_INVALID;
+               goto end;
+       }
+
+       if (index >= ext_header->nb_exclusions) {
+               ret = -LTTNG_ERR_INVALID;
+               goto end;
+       }
+
+       at = (void *) ext_header + sizeof(*ext_header);
+       at += ext_header->filter_len;
+       at += index * LTTNG_SYMBOL_NAME_LEN;
+       *exclusion_name = at;
+
+end:
+       return ret;
+}