Fix wrong returned valu on UST start trace
[lttng-tools.git] / include / lttng / lttng-ustconsumer.h
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1/*
2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; only version 2
8 * of the License.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#ifndef _LTTNG_USTCONSUMER_H
21#define _LTTNG_USTCONSUMER_H
22
23#include <config.h>
24#include <lttng/lttng-consumer.h>
25#include <errno.h>
26
74d0b642 27#ifdef HAVE_LIBLTTNG_UST_CTL
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28
29/*
30 * Mmap the ring buffer, read it and write the data to the tracefile.
31 *
32 * Returns the number of bytes written.
33 */
34extern int lttng_ustconsumer_on_read_subbuffer_mmap(
35 struct lttng_consumer_local_data *ctx,
36 struct lttng_consumer_stream *stream, unsigned long len);
37
38/* Not implemented */
39extern int lttng_ustconsumer_on_read_subbuffer_splice(
40 struct lttng_consumer_local_data *ctx,
41 struct lttng_consumer_stream *stream, unsigned long len);
42
43/*
44 * Take a snapshot for a specific fd
45 *
46 * Returns 0 on success, < 0 on error
47 */
48int lttng_ustconsumer_take_snapshot(struct lttng_consumer_local_data *ctx,
49 struct lttng_consumer_stream *stream);
50
51/*
52 * Get the produced position
53 *
54 * Returns 0 on success, < 0 on error
55 */
56int lttng_ustconsumer_get_produced_snapshot(
57 struct lttng_consumer_local_data *ctx,
58 struct lttng_consumer_stream *stream,
59 unsigned long *pos);
60
61int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
62 int sock, struct pollfd *consumer_sockpoll);
63
64extern int lttng_ustconsumer_allocate_channel(struct lttng_consumer_channel *chan);
65extern void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan);
66extern int lttng_ustconsumer_allocate_stream(struct lttng_consumer_stream *stream);
67extern void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream);
68
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69int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
70 struct lttng_consumer_local_data *ctx);
71int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream);
72
74d0b642 73#else /* HAVE_LIBLTTNG_UST_CTL */
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74
75static inline
76int lttng_ustconsumer_on_read_subbuffer_mmap(
77 struct lttng_consumer_local_data *ctx,
78 struct lttng_consumer_stream *stream, unsigned long len)
79{
80 return -ENOSYS;
81}
82
83static inline
84int lttng_ustconsumer_on_read_subbuffer_splice(
85 struct lttng_consumer_local_data *ctx,
86 struct lttng_consumer_stream *uststream, unsigned long len)
87{
88 return -ENOSYS;
89}
90
91static inline
92int lttng_ustconsumer_take_snapshot(struct lttng_consumer_local_data *ctx,
93 struct lttng_consumer_stream *stream)
94{
95 return -ENOSYS;
96}
97
98static inline
99int lttng_ustconsumer_get_produced_snapshot(
100 struct lttng_consumer_local_data *ctx,
101 struct lttng_consumer_stream *stream,
102 unsigned long *pos)
103{
104 return -ENOSYS;
105}
106
107static inline
108int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
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109 int sock, struct pollfd *consumer_sockpoll)
110{
111 return -ENOSYS;
112}
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113
114static inline
115int lttng_ustconsumer_allocate_channel(struct lttng_consumer_channel *chan)
116{
117 return -ENOSYS;
118}
119
120static inline
121void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan)
122{
123}
124
125static inline
126int lttng_ustconsumer_allocate_stream(struct lttng_consumer_stream *stream)
127{
128 return -ENOSYS;
129}
130
131static inline
132void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream)
133{
134}
135
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136static inline
137int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
138 struct lttng_consumer_local_data *ctx)
139{
140 return -ENOSYS;
141}
142
143static inline
144int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream)
145{
146 return -ENOSYS;
147}
148
74d0b642 149#endif /* HAVE_LIBLTTNG_UST_CTL */
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150
151#endif /* _LTTNG_USTCONSUMER_H */
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