Fix: Initialize ret to zero
[lttng-tools.git] / include / lttng / load.h
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1/*
2 * Copyright (C) 2014 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 *
5 * This library is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU Lesser General Public License, version 2.1 only,
7 * as published by the Free Software Foundation.
8 *
9 * This library is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public License
15 * along with this library; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#ifndef LTTNG_LOAD_H
20#define LTTNG_LOAD_H
21
22#ifdef __cplusplus
23extern "C" {
24#endif
25
26/*
27 * The lttng_load_session_attr object is opaque to the user. Use the helper
d13d3ec7 28 * functions below to use it.
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29 */
30struct lttng_load_session_attr;
31
32/*
33 * Return a newly allocated load session attribute object or NULL on error.
34 */
35struct lttng_load_session_attr *lttng_load_session_attr_create(void);
36
37/*
38 * Free a given load session attribute object.
39 */
40void lttng_load_session_attr_destroy(struct lttng_load_session_attr *attr);
41
42
43/*
d13d3ec7 44 * Load session attribute getter family of functions.
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45 */
46
d13d3ec7 47/* Return session name. NULL indicates all sessions must be loaded. */
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48const char *lttng_load_session_attr_get_session_name(
49 struct lttng_load_session_attr *attr);
50/*
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51 * Return input URL. A NULL value indicates the default session
52 * configuration location. The URL format used is documented in lttng-create(1).
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53 * NULL indicates that the default session configuration path is used.
54 */
55const char *lttng_load_session_attr_get_input_url(
56 struct lttng_load_session_attr *attr);
57
58/*
59 * Return the configuration overwrite attribute. This attribute indicates
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60 * whether or not the loaded session should be loaded even if a session with the
61 * same name already exists. If such a session exists, it is destroyed before
62 * the replacement is loaded.
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63 */
64int lttng_load_session_attr_get_overwrite(
65 struct lttng_load_session_attr *attr);
66
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67/*
68 * Return the destination URL configuration override attribute. This attribute
69 * indicates a destination URL override to be applied during the loading of the
70 * configuration.
71 *
72 * NULL indicates no override will be applied on configuration load.
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73 */
74const char *lttng_load_session_attr_get_override_url(
75 struct lttng_load_session_attr *attr);
76
77/*
78 * Return the configuration override control URL attribute. This attribute
79 * indicates a control URL override to be applied during the loading of the
80 * configuration(s).
81 *
82 * NULL indicates no control URL override will be applied on configuration load.
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83 */
84const char *lttng_load_session_attr_get_override_ctrl_url(
85 struct lttng_load_session_attr *attr);
86
87/*
88 * Return the configuration override data URL attribute. This attribute
6c103048 89 * indicates a data URL override to be applied during the loading of the
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90 * configuration(s).
91 *
92 * NULL indicates no data URL override will be applied on configuration load.
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93 */
94const char *lttng_load_session_attr_get_override_data_url(
95 struct lttng_load_session_attr *attr);
96
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97/*
98 * Return the configuration override session name attribute.
99 * This attribute indicates a session name override to be applied during
100 * the loading of the configuration(s).
101 *
102 * NULL indicates no session name override will be applied on configuration
103 * load.
104 */
105const char *lttng_load_session_attr_get_override_session_name(
106 struct lttng_load_session_attr *attr);
107
9245bd0e 108/*
d13d3ec7 109 * Load session attribute setter family of functions.
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110 *
111 * For every set* call, 0 is returned on success or else -LTTNG_ERR_INVALID is
112 * returned indicating that at least one given parameter is invalid.
113 */
114
115/*
116 * Set the name of the session to load. A NULL name means all sessions
d13d3ec7 117 * found at the input URL will be loaded.
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118 */
119int lttng_load_session_attr_set_session_name(
120 struct lttng_load_session_attr *attr, const char *session_name);
121
122/*
123 * Set the URL of the session configuration to load. A NULL value indicates the
d13d3ec7 124 * use of the default session configuration location.
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125 *
126 * Note that file:// is the only supported URL format.
127 */
128int lttng_load_session_attr_set_input_url(
129 struct lttng_load_session_attr *attr, const char *url);
130
131/*
d13d3ec7 132 * Set the overwrite attribute. If set to true, current sessions matching the
a2a75fa4 133 * loaded sessions will be destroyed and be replaced by the session(s) being
d13d3ec7 134 * loaded.
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135 */
136int lttng_load_session_attr_set_overwrite(
137 struct lttng_load_session_attr *attr, int overwrite);
138
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139/*
140 * The following setter are for overriding sessions attributes during the
141 * loading of a configuration files. Those attributes prevail upon those
142 * specified in the loaded configuration file.
143 * */
144
145/*
d5d2ef2b 146 * Set the url override attribute.
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147 *
148 * Supported format:
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149 * file://TRACEPATH
150 * NETPROTO://(HOST | IPADDR)[:CTRLPORT[:DATAPORT]][/TRACEPATH]
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151 *
152 * Where NETPROTO is one of {tcp, tcp6}
153 *
154 * See lttng-create(1) for more detail.
155 */
d5d2ef2b 156int lttng_load_session_attr_set_override_url(
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157 struct lttng_load_session_attr *attr, const char *url);
158
159/*
d5d2ef2b 160 * Set the control url override attribute.
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161 *
162 * Supported format:
163 * NETPROTO://(HOST | IPADDR)[:PORT][/TRACEPATH]
164 *
165 * Where NETPROTO is one of {tcp, tcp6}
166 *
167 * See lttng-create(1) for more detail.
168 */
d5d2ef2b 169int lttng_load_session_attr_set_override_ctrl_url(
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170 struct lttng_load_session_attr *attr, const char *url);
171
172/*
d5d2ef2b 173 * Set the data url override attribute.
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174 *
175 * Supported format:
d5d2ef2b 176 * NETPROTO://(HOST | IPADDR)[:PORT][/TRACEPATH]
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177 *
178 * Where NETPROTO is one of {tcp, tcp6}
179 *
180 * See lttng-create(1) for more detail.
181 */
d5d2ef2b 182int lttng_load_session_attr_set_override_data_url(
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183 struct lttng_load_session_attr *attr, const char *url);
184
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185/*
186 * Set the session name override attribute.
187 *
188 * Loading a configuration file defining multiple sessions will fail if a
189 * session name is provided.
190 */
191int lttng_load_session_attr_set_override_session_name(
192 struct lttng_load_session_attr *attr, const char *session_name);
193
9245bd0e 194/*
c4fc6c6c 195 * Load session configuration(s).
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196 *
197 * The lttng_load_session_attr object must not be NULL. No ownership of the
198 * object is kept by the function; it must be released by the caller.
199 *
200 * Returns 0 on success or a negative LTTNG_ERR value on error.
201 */
202int lttng_load_session(struct lttng_load_session_attr *attr);
203
204#ifdef __cplusplus
205}
206#endif
207
208#endif /* LTTNG_LOAD_H */
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