Split notification iterator API into base and specialized functions
[babeltrace.git] / plugins / ctf / fs-src / data-stream-file.h
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1#ifndef CTF_FS_DS_FILE_H
2#define CTF_FS_DS_FILE_H
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3
4/*
5 * Copyright 2016 - Philippe Proulx <pproulx@efficios.com>
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 */
25
26#include <stdio.h>
94cf822e 27#include <stdbool.h>
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28#include <glib.h>
29#include <babeltrace/babeltrace-internal.h>
30#include <babeltrace/ctf-ir/trace.h>
31
413bc2c4 32#include "../common/notif-iter/notif-iter.h"
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33#include "lttng-index.h"
34
35struct ctf_fs_component;
36struct ctf_fs_file;
1a9f7075 37struct ctf_fs_trace;
94cf822e 38struct ctf_fs_ds_file;
b6c3dcb2 39
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40struct ctf_fs_ds_index_entry {
41 /* Position, in bytes, of the packet from the beginning of the file. */
42 uint64_t offset;
43
44 /* Size of the packet, in bytes. */
45 uint64_t packet_size;
46
47 /*
48 * Extracted from the packet context, relative to the respective fields'
49 * mapped clock classes (in cycles).
50 */
b6c3dcb2 51 uint64_t timestamp_begin, timestamp_end;
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52
53 /*
54 * Converted from the packet context, relative to the trace's EPOCH
55 * (in ns since EPOCH).
56 */
57 int64_t timestamp_begin_ns, timestamp_end_ns;
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58};
59
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60struct ctf_fs_ds_index {
61 /* Array of struct ctf_fs_fd_index_entry. */
62 GArray *entries;
63};
64
65struct ctf_fs_ds_file_info {
66 /*
67 * Owned by this. May be NULL.
68 *
69 * A stream cannot be assumed to be indexed as the indexing might have
70 * been skipped. Moreover, the index's fields may not all be available
71 * depending on the producer (e.g. timestamp_begin/end are not
72 * mandatory).
73 *
74 * FIXME In such cases (missing fields), the indexing is aborted as
75 * no the index entries don't have a concept of fields being present
76 * or not.
77 */
78 struct ctf_fs_ds_index *index;
79
80 /* Owned by this. */
81 GString *path;
82
83 /* Guaranteed to be set, as opposed to the index. */
84 uint64_t begin_ns;
85};
86
87struct ctf_fs_ds_file {
88 /* Owned by this */
89 struct ctf_fs_file *file;
90
91 /* Owned by this */
92 struct bt_ctf_stream *stream;
93
94 /* Owned by this */
95 struct bt_clock_class_priority_map *cc_prio_map;
96
6de92955 97 /* Weak */
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98 struct bt_ctf_notif_iter *notif_iter;
99
100 void *mmap_addr;
101
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102 /*
103 * Max length of chunk to mmap() when updating the current mapping.
104 * This value must be page-aligned.
105 */
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106 size_t mmap_max_len;
107
2c701ca6 108 /* Length of the current mapping. Never exceeds the file's length. */
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109 size_t mmap_len;
110
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111 /* Offset in the file where the current mapping starts. */
112 off_t mmap_offset;
113
114 /*
115 * Offset, in the current mapping, of the address to return on the next
116 * request.
117 */
118 off_t request_offset;
119
120 bool end_reached;
b6c3dcb2 121};
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122
123BT_HIDDEN
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124struct ctf_fs_ds_file *ctf_fs_ds_file_create(
125 struct ctf_fs_trace *ctf_fs_trace,
6de92955 126 struct bt_ctf_notif_iter *notif_iter,
97ade20b 127 struct bt_ctf_stream *stream, const char *path);
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128
129BT_HIDDEN
94cf822e 130int ctf_fs_ds_file_get_packet_header_context_fields(
97ade20b 131 struct ctf_fs_ds_file *ds_file,
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132 struct bt_ctf_field **packet_header_field,
133 struct bt_ctf_field **packet_context_field);
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134
135BT_HIDDEN
94cf822e 136void ctf_fs_ds_file_destroy(struct ctf_fs_ds_file *stream);
e98a2d6e 137
4f1f88a6 138BT_HIDDEN
90157d89 139struct bt_notification_iterator_next_method_return ctf_fs_ds_file_next(
94cf822e 140 struct ctf_fs_ds_file *stream);
4f1f88a6 141
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142BT_HIDDEN
143struct ctf_fs_ds_index *ctf_fs_ds_file_build_index(
144 struct ctf_fs_ds_file *ds_file);
145
146BT_HIDDEN
147void ctf_fs_ds_index_destroy(struct ctf_fs_ds_index *index);
148
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149extern struct bt_ctf_notif_iter_medium_ops ctf_fs_ds_file_medops;
150
94cf822e 151#endif /* CTF_FS_DS_FILE_H */
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