Use common functions for module loading and unloading
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.h
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #ifndef _LTT_TRACE_KERNEL_H
19 #define _LTT_TRACE_KERNEL_H
20
21 #include <urcu/list.h>
22
23 #include <lttng/lttng.h>
24 #include <common/lttng-kernel.h>
25 #include <common/lttng-kernel-old.h>
26 #include <common/defaults.h>
27
28 #include "consumer.h"
29
30 /* Kernel event list */
31 struct ltt_kernel_event_list {
32 struct cds_list_head head;
33 };
34
35 /* Channel stream list */
36 struct ltt_kernel_stream_list {
37 struct cds_list_head head;
38 };
39
40 /* Channel list */
41 struct ltt_kernel_channel_list {
42 struct cds_list_head head;
43 };
44
45 /* Kernel event */
46 struct ltt_kernel_event {
47 int fd;
48 int enabled;
49 struct lttng_kernel_event *event;
50 struct cds_list_head list;
51 };
52
53 /* Kernel channel */
54 struct ltt_kernel_channel {
55 int fd;
56 int enabled;
57 unsigned int stream_count;
58 unsigned int event_count;
59 /*
60 * TODO: need internal representation to support more than a
61 * single context.
62 */
63 struct lttng_kernel_context *ctx;
64 struct lttng_channel *channel;
65 struct ltt_kernel_event_list events_list;
66 struct ltt_kernel_stream_list stream_list;
67 struct cds_list_head list;
68 /* Session pointer which has a reference to this object. */
69 struct ltt_kernel_session *session;
70 };
71
72 /* Metadata */
73 struct ltt_kernel_metadata {
74 int fd;
75 struct lttng_channel *conf;
76 };
77
78 /* Channel stream */
79 struct ltt_kernel_stream {
80 int fd;
81 int state;
82 int cpu;
83 /* Format is %s_%d respectively channel name and CPU number. */
84 char name[DEFAULT_STREAM_NAME_LEN];
85 uint64_t tracefile_size;
86 uint64_t tracefile_count;
87 struct cds_list_head list;
88 };
89
90 /* Kernel session */
91 struct ltt_kernel_session {
92 int fd;
93 int metadata_stream_fd;
94 int consumer_fds_sent;
95 unsigned int channel_count;
96 unsigned int stream_count_global;
97 struct ltt_kernel_metadata *metadata;
98 struct ltt_kernel_channel_list channel_list;
99 /* UID/GID of the user owning the session */
100 uid_t uid;
101 gid_t gid;
102 /*
103 * Two consumer_output object are needed where one is needed for the
104 * current output object and the second one is the temporary object used to
105 * store URI being set by the lttng_set_consumer_uri call. Once
106 * lttng_enable_consumer is called, the two pointers are swapped.
107 */
108 struct consumer_output *consumer;
109 struct consumer_output *tmp_consumer;
110 /* Tracing session id */
111 uint64_t id;
112 /* Session is active or not meaning it has been started or stopped. */
113 unsigned int active:1;
114 /* Tell or not if the session has to output the traces. */
115 unsigned int output_traces;
116 unsigned int snapshot_mode;
117 unsigned int has_non_default_channel;
118 };
119
120 /*
121 * Lookup functions. NULL is returned if not found.
122 */
123 struct ltt_kernel_event *trace_kernel_get_event_by_name(
124 char *name, struct ltt_kernel_channel *channel);
125 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
126 char *name, struct ltt_kernel_session *session);
127
128 /*
129 * Create functions malloc() the data structure.
130 */
131 struct ltt_kernel_session *trace_kernel_create_session(void);
132 struct ltt_kernel_channel *trace_kernel_create_channel(
133 struct lttng_channel *chan);
134 struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev);
135 struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
136 struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
137 unsigned int count);
138
139 /*
140 * Destroy functions free() the data structure and remove from linked list if
141 * it's applies.
142 */
143 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
144 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
145 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
146 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
147 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
148
149 #endif /* _LTT_TRACE_KERNEL_H */
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