1 #ifndef BABELTRACE_CTF_WRITER_WRITER_H
2 #define BABELTRACE_CTF_WRITER_WRITER_H
5 * BabelTrace - CTF Writer: Writer
7 * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
9 * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
11 * Permission is hereby granted, free of charge, to any person obtaining a copy
12 * of this software and associated documentation files (the "Software"), to deal
13 * in the Software without restriction, including without limitation the rights
14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 * copies of the Software, and to permit persons to whom the Software is
16 * furnished to do so, subject to the following conditions:
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
29 * The Common Trace Format (CTF) Specification is available at
30 * http://www.efficios.com/ctf
33 #include <babeltrace/ctf-ir/event-types.h>
41 struct bt_ctf_stream_class
;
45 * bt_ctf_writer_create: create a writer instance.
47 * Allocate a new writer that will produce a trace in the given path.
48 * The creation of a writer sets its reference count to 1.
50 * @param path Path to the trace's containing folder (string is copied).
52 * Returns an allocated writer on success, NULL on error.
54 extern struct bt_ctf_writer
*bt_ctf_writer_create(const char *path
);
57 * bt_ctf_writer_create_stream: create a stream instance.
59 * Allocate a new stream instance and register it to the writer. The creation of
60 * a stream sets its reference count to 1.
62 * @param writer Writer instance.
63 * @param stream_class Stream class to instantiate.
65 * Returns an allocated writer on success, NULL on error.
67 extern struct bt_ctf_stream
*bt_ctf_writer_create_stream(
68 struct bt_ctf_writer
*writer
,
69 struct bt_ctf_stream_class
*stream_class
);
72 * bt_ctf_writer_add_environment_field: add an environment field to the trace.
74 * Add an environment field to the trace. The name and value parameters are
77 * @param writer Writer instance.
78 * @param name Name of the environment field (will be copied).
79 * @param value Value of the environment field (will be copied).
81 * Returns 0 on success, a negative value on error.
83 extern int bt_ctf_writer_add_environment_field(struct bt_ctf_writer
*writer
,
88 * bt_ctf_writer_add_clock: add a clock to the trace.
90 * Add a clock to the trace. Clocks assigned to stream classes must be
91 * registered to the writer.
93 * @param writer Writer instance.
94 * @param clock Clock to add to the trace.
96 * Returns 0 on success, a negative value on error.
98 extern int bt_ctf_writer_add_clock(struct bt_ctf_writer
*writer
,
99 struct bt_ctf_clock
*clock
);
102 * bt_ctf_writer_get_metadata_string: get meta-data string.
104 * Get the trace's TSDL meta-data. The caller assumes the ownership of the
107 * @param writer Writer instance.
109 * Returns the metadata string on success, NULL on error.
111 extern char *bt_ctf_writer_get_metadata_string(struct bt_ctf_writer
*writer
);
114 * bt_ctf_writer_flush_metadata: flush the trace's metadata to disk.
116 * Flush the trace's metadata to the metadata file. Note that the metadata will
117 * be flushed automatically when the Writer instance is released (last call to
118 * bt_ctf_writer_put).
120 * @param writer Writer instance.
122 extern void bt_ctf_writer_flush_metadata(struct bt_ctf_writer
*writer
);
125 * bt_ctf_writer_set_byte_order: set a field type's byte order.
127 * Set the trace's byte order. Defaults to BT_CTF_BYTE_ORDER_NATIVE,
128 * the host machine's endianness.
130 * @param writer Writer instance.
131 * @param byte_order Trace's byte order.
133 * Returns 0 on success, a negative value on error.
135 extern int bt_ctf_writer_set_byte_order(struct bt_ctf_writer
*writer
,
136 enum bt_ctf_byte_order byte_order
);
139 * bt_ctf_writer_get and bt_ctf_writer_put: increment and decrement the
140 * writer's reference count.
142 * These functions ensure that the writer won't be destroyed while it
143 * is in use. The same number of get and put (plus one extra put to
144 * release the initial reference done at creation) have to be done to
147 * When the writer's reference count is decremented to 0 by a
148 * bt_ctf_writer_put, the writer is freed.
150 * @param writer Writer instance.
152 extern void bt_ctf_writer_get(struct bt_ctf_writer
*writer
);
153 extern void bt_ctf_writer_put(struct bt_ctf_writer
*writer
);
159 #endif /* BABELTRACE_CTF_WRITER_WRITER_H */