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1239a312 DG |
1 | /* |
2 | * Copyright (C) 2014 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
11 | * for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public License | |
14 | * along with this library; if not, write to the Free Software Foundation, | |
15 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | ||
18 | #ifndef LTTNG_SESSION_H | |
19 | #define LTTNG_SESSION_H | |
20 | ||
21 | #ifdef __cplusplus | |
22 | extern "C" { | |
23 | #endif | |
24 | ||
25 | /* | |
26 | * Basic session information. | |
27 | * | |
28 | * The "enabled" field is only used when listing the sessions which indicate if | |
29 | * it's started or not. | |
30 | * | |
31 | * The structures should be initialized to zero before use. | |
32 | */ | |
33 | #define LTTNG_SESSION_PADDING1 12 | |
34 | struct lttng_session { | |
36d2e35d | 35 | char name[LTTNG_NAME_MAX]; |
e435a724 JG |
36 | /* |
37 | * Human-readable representation of the trace's destination. | |
38 | * In the case of a local tracing session, a path is provided: | |
39 | * /path/to/the/output | |
40 | * | |
41 | * In the case of a remote (network) tracing session, the string has | |
42 | * the following format: | |
43 | * net://hostname/path:ctrl_port [data: data_port] | |
44 | */ | |
1239a312 DG |
45 | char path[PATH_MAX]; |
46 | uint32_t enabled; /* enabled/started: 1, disabled/stopped: 0 */ | |
47 | uint32_t snapshot_mode; | |
48 | unsigned int live_timer_interval; /* usec */ | |
49 | ||
50 | char padding[LTTNG_SESSION_PADDING1]; | |
51 | }; | |
52 | ||
53 | /* | |
54 | * Create a tracing session using a name and an optional URL. | |
55 | * | |
56 | * If _url_ is NULL, no consumer is created for the session. The name can't be | |
57 | * NULL here. | |
58 | * | |
59 | * Return 0 on success else a negative LTTng error code. | |
60 | */ | |
61 | extern int lttng_create_session(const char *name, const char *url); | |
62 | ||
63 | /* | |
64 | * Create a tracing session that will exclusively be used for snapshot meaning | |
65 | * the session will be in no output mode and every channel enabled for that | |
66 | * session will be set in overwrite mode and in mmap output since splice is not | |
67 | * supported. | |
68 | * | |
69 | * Name can't be NULL. If an url is given, it will be used to create a default | |
70 | * snapshot output using it as a destination. If NULL, no output will be | |
71 | * defined and an add-output call will be needed. | |
72 | * | |
73 | * Return 0 on success else a negative LTTng error code. | |
74 | */ | |
75 | extern int lttng_create_session_snapshot(const char *name, | |
76 | const char *snapshot_url); | |
77 | ||
78 | /* | |
79 | * Create a session exclusively used for live reading. | |
80 | * | |
81 | * In this mode, the switch-timer parameter is forced for each UST channel, a | |
82 | * live-switch-timer is enabled for kernel channels, manually setting | |
83 | * switch-timer is forbidden. Synchronization beacons are sent to the relayd, | |
84 | * indexes are sent and metadata is checked for each packet. | |
85 | * | |
86 | * Name can't be NULL. If no URL is given, the default is to send the data to | |
87 | * net://127.0.0.1. The timer_interval is in usec and by default set to 1000000 | |
88 | * (1 second). | |
89 | * | |
90 | * Return 0 on success else a negative LTTng error code. | |
91 | */ | |
92 | extern int lttng_create_session_live(const char *name, const char *url, | |
93 | unsigned int timer_interval); | |
94 | ||
95 | /* | |
96 | * Destroy a tracing session. | |
97 | * | |
98 | * The session will not be usable, tracing will be stopped thus buffers will be | |
99 | * flushed. | |
100 | * | |
e20ee7c2 JD |
101 | * This call will wait for data availability for each domain of the session, |
102 | * which can take an arbitrary amount of time. However, when returning the | |
103 | * tracing data is guaranteed to be ready to be read and analyzed. | |
104 | * | |
105 | * lttng_destroy_session_no_wait() may be used if such a guarantee is not | |
106 | * needed. | |
107 | * | |
1239a312 DG |
108 | * The name can't be NULL here. |
109 | * | |
110 | * Return 0 on success else a negative LTTng error code. | |
111 | */ | |
112 | extern int lttng_destroy_session(const char *name); | |
113 | ||
e20ee7c2 JD |
114 | /* |
115 | * Behaves exactly like lttng_destroy_session but does not wait for data | |
116 | * availability. | |
117 | */ | |
118 | extern int lttng_destroy_session_no_wait(const char *name); | |
119 | ||
1239a312 DG |
120 | /* |
121 | * List all the tracing sessions. | |
122 | * | |
123 | * Return the size (number of entries) of the "lttng_session" array. Caller | |
124 | * must free sessions. On error, a negative LTTng error code is returned. | |
125 | */ | |
126 | extern int lttng_list_sessions(struct lttng_session **sessions); | |
127 | ||
d7ba1388 MD |
128 | /* |
129 | * Set the shared memory path for a session. | |
130 | * | |
131 | * Sets the (optional) file system path where shared memory buffers will | |
132 | * be created for the session. This is useful for buffer extraction on | |
133 | * crash, when used with filesystems like pramfs. | |
134 | * | |
135 | * Return 0 on success else a negative LTTng error code. | |
136 | */ | |
137 | extern int lttng_set_session_shm_path(const char *session_name, | |
138 | const char *shm_path); | |
139 | ||
ccf10263 MD |
140 | /* |
141 | * Add PID to session tracker. | |
142 | * | |
143 | * A pid argument >= 0 adds the PID to the session tracker. | |
144 | * A pid argument of -1 means "track all PIDs". | |
145 | * | |
146 | * Return 0 on success else a negative LTTng error code. | |
147 | */ | |
148 | extern int lttng_track_pid(struct lttng_handle *handle, int pid); | |
149 | ||
150 | /* | |
151 | * Remove PID from session tracker. | |
152 | * | |
153 | * A pid argument >= 0 removes the PID from the session tracker. | |
154 | * A pid argument of -1 means "untrack all PIDs". | |
155 | * | |
156 | * Return 0 on success else a negative LTTng error code. | |
157 | */ | |
158 | extern int lttng_untrack_pid(struct lttng_handle *handle, int pid); | |
159 | ||
a5dfbb9d MD |
160 | /* |
161 | * List PIDs in the tracker. | |
162 | * | |
36dc4128 JG |
163 | * enabled is set to whether the PID tracker is enabled. |
164 | * pids is set to an allocated array of PIDs currently tracked. On | |
165 | * success, pids must be freed by the caller. | |
166 | * nr_pids is set to the number of entries contained by the pids array. | |
a5dfbb9d MD |
167 | * |
168 | * Returns 0 on success, else a negative LTTng error code. | |
169 | */ | |
170 | extern int lttng_list_tracker_pids(struct lttng_handle *handle, | |
171 | int *enabled, int32_t **pids, size_t *nr_pids); | |
172 | ||
1239a312 DG |
173 | #ifdef __cplusplus |
174 | } | |
175 | #endif | |
176 | ||
177 | #endif /* LTTNG_SESSION_H */ |