Fix: return value signedness
[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
26 /* Kernel event list */
27 struct ltt_kernel_event_list {
28 struct cds_list_head head;
29 };
30
31 /* Channel stream list */
32 struct ltt_kernel_stream_list {
33 struct cds_list_head head;
34 };
35
36 /* Channel list */
37 struct ltt_kernel_channel_list {
38 struct cds_list_head head;
39 };
40
41 /* Kernel event */
42 struct ltt_kernel_event {
43 int fd;
44 int enabled;
45 /*
46 * TODO: need internal representation to support more than a
47 * single context.
48 */
49 struct lttng_kernel_context *ctx;
50 struct lttng_kernel_event *event;
51 struct cds_list_head list;
52 };
53
54 /* Kernel channel */
55 struct ltt_kernel_channel {
56 int fd;
57 int enabled;
58 char *pathname;
59 unsigned int stream_count;
60 unsigned int event_count;
61 /*
62 * TODO: need internal representation to support more than a
63 * single context.
64 */
65 struct lttng_kernel_context *ctx;
66 struct lttng_channel *channel;
67 struct ltt_kernel_event_list events_list;
68 struct ltt_kernel_stream_list stream_list;
69 struct cds_list_head list;
70 };
71
72 /* Metadata */
73 struct ltt_kernel_metadata {
74 int fd;
75 char *pathname;
76 struct lttng_channel *conf;
77 };
78
79 /* Channel stream */
80 struct ltt_kernel_stream {
81 int fd;
82 char *pathname;
83 int state;
84 struct cds_list_head list;
85 };
86
87 /* Kernel session */
88 struct ltt_kernel_session {
89 int fd;
90 int metadata_stream_fd;
91 int consumer_fds_sent;
92 int consumer_fd;
93 unsigned int channel_count;
94 unsigned int stream_count_global;
95 char *trace_path;
96 struct ltt_kernel_metadata *metadata;
97 struct ltt_kernel_channel_list channel_list;
98 /* UID/GID of the user owning the session */
99 uid_t uid;
100 gid_t gid;
101 };
102
103 /*
104 * Lookup functions. NULL is returned if not found.
105 */
106 struct ltt_kernel_event *trace_kernel_get_event_by_name(
107 char *name, struct ltt_kernel_channel *channel);
108 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
109 char *name, struct ltt_kernel_session *session);
110
111 /*
112 * Create functions malloc() the data structure.
113 */
114 struct ltt_kernel_session *trace_kernel_create_session(char *path);
115 struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path);
116 struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev);
117 struct ltt_kernel_metadata *trace_kernel_create_metadata(char *path);
118 struct ltt_kernel_stream *trace_kernel_create_stream(void);
119
120 /*
121 * Destroy functions free() the data structure and remove from linked list if
122 * it's applies.
123 */
124 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
125 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
126 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
127 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
128 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
129
130 #endif /* _LTT_TRACE_KERNEL_H */
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