include/lttng/load.h

   1 /*
   2  * Copyright (C) 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  * Copyright (C) 2014 David Goulet <dgoulet@efficios.com>
   4  *
   5  * SPDX-License-Identifier: LGPL-2.1-only
   6  *
   7  */
   8
   9 #ifndef LTTNG_LOAD_H
  10 #define LTTNG_LOAD_H
  11
  12 #ifdef __cplusplus
  13 extern "C" {
  14 #endif
  15
  16 /*
  17  * The lttng_load_session_attr object is opaque to the user. Use the helper
  18  * functions below to use it.
  19  */
  20 struct lttng_load_session_attr;
  21
  22 /*
  23  * Return a newly allocated load session attribute object or NULL on error.
  24  */
  25 extern struct lttng_load_session_attr *lttng_load_session_attr_create(void);
  26
  27 /*
  28  * Free a given load session attribute object.
  29  */
  30 extern void lttng_load_session_attr_destroy(struct lttng_load_session_attr *attr);
  31
  32
  33 /*
  34  * Load session attribute getter family of functions.
  35  */
  36
  37 /* Return session name. NULL indicates all sessions must be loaded. */
  38 extern const char *lttng_load_session_attr_get_session_name(
  39         struct lttng_load_session_attr *attr);
  40 /*
  41  * Return input URL. A NULL value indicates the default session
  42  * configuration location. The URL format used is documented in lttng-create(1).
  43  * NULL indicates that the default session configuration path is used.
  44  */
  45 extern const char *lttng_load_session_attr_get_input_url(
  46         struct lttng_load_session_attr *attr);
  47
  48 /*
  49  * Return the configuration overwrite attribute. This attribute indicates
  50  * whether or not the loaded session should be loaded even if a session with the
  51  * same name already exists. If such a session exists, it is destroyed before
  52  * the replacement is loaded.
  53  */
  54 extern int lttng_load_session_attr_get_overwrite(
  55         struct lttng_load_session_attr *attr);
  56
  57 /*
  58  * Return the destination URL configuration override attribute. This attribute
  59  * indicates a destination URL override to be applied during the loading of the
  60  * configuration.
  61  *
  62  * NULL indicates no override will be applied on configuration load.
  63  */
  64 extern const char *lttng_load_session_attr_get_override_url(
  65         struct lttng_load_session_attr *attr);
  66
  67 /*
  68  * Return the configuration override control URL attribute. This attribute
  69  * indicates a control URL override to be applied during the loading of the
  70  * configuration(s).
  71  *
  72  * NULL indicates no control URL override will be applied on configuration load.
  73  */
  74 extern const char *lttng_load_session_attr_get_override_ctrl_url(
  75         struct lttng_load_session_attr *attr);
  76
  77 /*
  78  * Return the configuration override data URL attribute. This attribute
  79  * indicates a data URL override to be applied during the loading of the
  80  * configuration(s).
  81  *
  82  * NULL indicates no data URL override will be applied on configuration load.
  83  */
  84 extern const char *lttng_load_session_attr_get_override_data_url(
  85         struct lttng_load_session_attr *attr);
  86
  87 /*
  88  * Return the configuration override session name attribute.
  89  * This attribute indicates a session name override to be applied during
  90  * the loading of the configuration(s).
  91  *
  92  * NULL indicates no session name override will be applied on configuration
  93  * load.
  94  */
  95 extern const char *lttng_load_session_attr_get_override_session_name(
  96         struct lttng_load_session_attr *attr);
  97
  98 /*
  99  * Load session attribute setter family of functions.
 100  *
 101  * For every set* call, 0 is returned on success or else -LTTNG_ERR_INVALID is
 102  * returned indicating that at least one given parameter is invalid.
 103  */
 104
 105 /*
 106  * Set the name of the session to load. A NULL name means all sessions
 107  * found at the input URL will be loaded.
 108  */
 109 extern int lttng_load_session_attr_set_session_name(
 110         struct lttng_load_session_attr *attr, const char *session_name);
 111
 112 /*
 113  * Set the URL of the session configuration to load. A NULL value indicates the
 114  * use of the default session configuration location.
 115  *
 116  * Note that file:// is the only supported URL format.
 117  */
 118 extern int lttng_load_session_attr_set_input_url(
 119         struct lttng_load_session_attr *attr, const char *url);
 120
 121 /*
 122  * Set the overwrite attribute. If set to true, current sessions matching the
 123  * loaded sessions will be destroyed and be replaced by the session(s) being
 124  * loaded.
 125  */
 126 extern int lttng_load_session_attr_set_overwrite(
 127         struct lttng_load_session_attr *attr, int overwrite);
 128
 129 /*
 130  * The following setter are for overriding sessions attributes during the
 131  * loading of a configuration files. Those attributes prevail upon those
 132  * specified in the loaded configuration file.
 133  * */
 134
 135 /*
 136  * Set the url override attribute.
 137  *
 138  * Supported format:
 139  *    file://TRACEPATH
 140  *    NETPROTO://(HOST | IPADDR)[:CTRLPORT[:DATAPORT]][/TRACEPATH]
 141  *
 142  *     Where NETPROTO is one of {tcp, tcp6}
 143  *
 144  * See lttng-create(1) for more detail.
 145  */
 146 extern int lttng_load_session_attr_set_override_url(
 147         struct lttng_load_session_attr *attr, const char *url);
 148
 149 /*
 150  * Set the control url override attribute.
 151  *
 152  * Supported format:
 153  *     NETPROTO://(HOST | IPADDR)[:PORT][/TRACEPATH]
 154  *
 155  *     Where NETPROTO is one of {tcp, tcp6}
 156  *
 157  * See lttng-create(1) for more detail.
 158  */
 159 extern int lttng_load_session_attr_set_override_ctrl_url(
 160         struct lttng_load_session_attr *attr, const char *url);
 161
 162 /*
 163  * Set the data url override attribute.
 164  *
 165  * Supported format:
 166  *     NETPROTO://(HOST | IPADDR)[:PORT][/TRACEPATH]
 167  *
 168  *     Where NETPROTO is one of {tcp, tcp6}
 169  *
 170  * See lttng-create(1) for more detail.
 171  */
 172 extern int lttng_load_session_attr_set_override_data_url(
 173         struct lttng_load_session_attr *attr, const char *url);
 174
 175 /*
 176  * Set the session name override attribute.
 177  *
 178  * Loading a configuration file defining multiple sessions will fail if a
 179  * session name is provided.
 180  */
 181 extern int lttng_load_session_attr_set_override_session_name(
 182         struct lttng_load_session_attr *attr, const char *session_name);
 183
 184 /*
 185  * Load session configuration(s).
 186  *
 187  * The lttng_load_session_attr object must not be NULL. No ownership of the
 188  * object is kept by the function; it must be released by the caller.
 189  *
 190  * Returns 0 on success or a negative LTTNG_ERR value on error.
 191  */
 192 extern int lttng_load_session(struct lttng_load_session_attr *attr);
 193
 194 #ifdef __cplusplus
 195 }
 196 #endif
 197
 198 #endif /* LTTNG_LOAD_H */