lttng-ctl: move lttng_event functions to a new file
[lttng-tools.git] / src / lib / lttng-ctl / event.c
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1/*
2 * event.c
3 *
4 * Linux Trace Toolkit Control Library
5 *
6 * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
7 *
8 * This library is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License, version 2.1 only,
10 * as published by the Free Software Foundation.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#define _LGPL_SOURCE
23#include <lttng/event.h>
24#include <lttng/lttng-error.h>
25#include <stddef.h>
26#include <common/sessiond-comm/sessiond-comm.h>
27
28int lttng_event_get_filter_expression(struct lttng_event *event,
29 const char **filter_expression)
30{
31 int ret = 0;
32 struct lttcomm_event_extended_header *ext_header;
33
34 if (!event || !filter_expression) {
35 ret = -LTTNG_ERR_INVALID;
36 goto end;
37 }
38
39 ext_header = event->extended.ptr;
40
41 if (!ext_header) {
42 /*
43 * This can happen since the lttng_event structure is
44 * used for other tasks where this pointer is never set.
45 */
46 *filter_expression = NULL;
47 goto end;
48 }
49
50 if (ext_header->filter_len) {
51 *filter_expression = ((const char *) (ext_header)) +
52 sizeof(*ext_header);
53 } else {
54 *filter_expression = NULL;
55 }
56
57end:
58 return ret;
59}
60
61int lttng_event_get_exclusion_name_count(struct lttng_event *event)
62{
63 int ret;
64 struct lttcomm_event_extended_header *ext_header;
65
66 if (!event) {
67 ret = -LTTNG_ERR_INVALID;
68 goto end;
69 }
70
71 ext_header = event->extended.ptr;
72 if (!ext_header) {
73 /*
74 * This can happen since the lttng_event structure is
75 * used for other tasks where this pointer is never set.
76 */
77 ret = 0;
78 goto end;
79 }
80
81 if (ext_header->nb_exclusions > INT_MAX) {
82 ret = -LTTNG_ERR_OVERFLOW;
83 goto end;
84 }
85 ret = (int) ext_header->nb_exclusions;
86end:
87 return ret;
88}
89
90int lttng_event_get_exclusion_name(struct lttng_event *event,
91 size_t index, const char **exclusion_name)
92{
93 int ret = 0;
94 struct lttcomm_event_extended_header *ext_header;
95 void *at;
96
97 if (!event || !exclusion_name) {
98 ret = -LTTNG_ERR_INVALID;
99 goto end;
100 }
101
102 ext_header = event->extended.ptr;
103 if (!ext_header) {
104 ret = -LTTNG_ERR_INVALID;
105 goto end;
106 }
107
108 if (index >= ext_header->nb_exclusions) {
109 ret = -LTTNG_ERR_INVALID;
110 goto end;
111 }
112
113 at = (void *) ext_header + sizeof(*ext_header);
114 at += ext_header->filter_len;
115 at += index * LTTNG_SYMBOL_NAME_LEN;
116 *exclusion_name = at;
117
118end:
119 return ret;
120}
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