| 1 | /* |
| 2 | * writer.c |
| 3 | * |
| 4 | * Babeltrace CTF Writer |
| 5 | * |
| 6 | * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 7 | * |
| 8 | * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 9 | * |
| 10 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 11 | * of this software and associated documentation files (the "Software"), to deal |
| 12 | * in the Software without restriction, including without limitation the rights |
| 13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 14 | * copies of the Software, and to permit persons to whom the Software is |
| 15 | * furnished to do so, subject to the following conditions: |
| 16 | * |
| 17 | * The above copyright notice and this permission notice shall be included in |
| 18 | * all copies or substantial portions of the Software. |
| 19 | * |
| 20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 23 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 26 | * SOFTWARE. |
| 27 | */ |
| 28 | |
| 29 | #include <babeltrace/ctf-ir/clock-internal.h> |
| 30 | #include <babeltrace/ctf-writer/writer-internal.h> |
| 31 | #include <babeltrace/ctf-ir/event-types-internal.h> |
| 32 | #include <babeltrace/ctf-ir/event-fields-internal.h> |
| 33 | #include <babeltrace/ctf-writer/functor-internal.h> |
| 34 | #include <babeltrace/ctf-ir/stream-class-internal.h> |
| 35 | #include <babeltrace/ctf-ir/stream-internal.h> |
| 36 | #include <babeltrace/compiler.h> |
| 37 | #include <stdio.h> |
| 38 | #include <stdlib.h> |
| 39 | #include <sys/stat.h> |
| 40 | #include <errno.h> |
| 41 | #include <unistd.h> |
| 42 | #include <fcntl.h> |
| 43 | #include <inttypes.h> |
| 44 | |
| 45 | static |
| 46 | void bt_ctf_writer_destroy(struct bt_ctf_ref *ref); |
| 47 | static |
| 48 | int create_stream_file(struct bt_ctf_writer *writer, |
| 49 | struct bt_ctf_stream *stream); |
| 50 | |
| 51 | struct bt_ctf_writer *bt_ctf_writer_create(const char *path) |
| 52 | { |
| 53 | struct bt_ctf_writer *writer = NULL; |
| 54 | |
| 55 | if (!path) { |
| 56 | goto error; |
| 57 | } |
| 58 | |
| 59 | writer = g_new0(struct bt_ctf_writer, 1); |
| 60 | if (!writer) { |
| 61 | goto error; |
| 62 | } |
| 63 | |
| 64 | bt_ctf_ref_init(&writer->ref_count); |
| 65 | writer->path = g_string_new(path); |
| 66 | if (!writer->path) { |
| 67 | goto error_destroy; |
| 68 | } |
| 69 | |
| 70 | writer->trace = bt_ctf_trace_create(); |
| 71 | if (!writer->trace) { |
| 72 | goto error_destroy; |
| 73 | } |
| 74 | |
| 75 | /* Create trace directory if necessary and open a metadata file */ |
| 76 | if (g_mkdir_with_parents(path, S_IRWXU | S_IRWXG)) { |
| 77 | perror("g_mkdir_with_parents"); |
| 78 | goto error_destroy; |
| 79 | } |
| 80 | |
| 81 | writer->trace_dir_fd = open(path, O_RDONLY, S_IRWXU | S_IRWXG); |
| 82 | if (writer->trace_dir_fd < 0) { |
| 83 | perror("open"); |
| 84 | goto error_destroy; |
| 85 | } |
| 86 | |
| 87 | writer->metadata_fd = openat(writer->trace_dir_fd, "metadata", |
| 88 | O_WRONLY | O_CREAT | O_TRUNC, |
| 89 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 90 | |
| 91 | return writer; |
| 92 | |
| 93 | error_destroy: |
| 94 | unlinkat(writer->trace_dir_fd, "metadata", 0); |
| 95 | bt_ctf_writer_destroy(&writer->ref_count); |
| 96 | writer = NULL; |
| 97 | error: |
| 98 | return writer; |
| 99 | } |
| 100 | |
| 101 | void bt_ctf_writer_destroy(struct bt_ctf_ref *ref) |
| 102 | { |
| 103 | struct bt_ctf_writer *writer; |
| 104 | |
| 105 | if (!ref) { |
| 106 | return; |
| 107 | } |
| 108 | |
| 109 | writer = container_of(ref, struct bt_ctf_writer, ref_count); |
| 110 | bt_ctf_writer_flush_metadata(writer); |
| 111 | if (writer->path) { |
| 112 | g_string_free(writer->path, TRUE); |
| 113 | } |
| 114 | |
| 115 | if (writer->trace_dir_fd > 0) { |
| 116 | if (close(writer->trace_dir_fd)) { |
| 117 | perror("close"); |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | if (writer->metadata_fd > 0) { |
| 122 | if (close(writer->metadata_fd)) { |
| 123 | perror("close"); |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | bt_ctf_trace_put(writer->trace); |
| 128 | g_free(writer); |
| 129 | } |
| 130 | |
| 131 | struct bt_ctf_trace *bt_ctf_writer_get_trace(struct bt_ctf_writer *writer) |
| 132 | { |
| 133 | struct bt_ctf_trace *trace = NULL; |
| 134 | |
| 135 | if (!writer) { |
| 136 | goto end; |
| 137 | } |
| 138 | |
| 139 | trace = writer->trace; |
| 140 | bt_ctf_trace_get(trace); |
| 141 | end: |
| 142 | return trace; |
| 143 | } |
| 144 | |
| 145 | struct bt_ctf_stream *bt_ctf_writer_create_stream(struct bt_ctf_writer *writer, |
| 146 | struct bt_ctf_stream_class *stream_class) |
| 147 | { |
| 148 | int stream_fd; |
| 149 | struct bt_ctf_stream *stream = NULL; |
| 150 | |
| 151 | if (!writer || !stream_class) { |
| 152 | goto error; |
| 153 | } |
| 154 | |
| 155 | stream = bt_ctf_trace_create_stream(writer->trace, stream_class); |
| 156 | if (!stream) { |
| 157 | goto error; |
| 158 | } |
| 159 | |
| 160 | stream_fd = create_stream_file(writer, stream); |
| 161 | if (stream_fd < 0 || bt_ctf_stream_set_fd(stream, stream_fd)) { |
| 162 | goto error; |
| 163 | } |
| 164 | |
| 165 | writer->frozen = 1; |
| 166 | return stream; |
| 167 | |
| 168 | error: |
| 169 | bt_ctf_stream_put(stream); |
| 170 | return NULL; |
| 171 | } |
| 172 | |
| 173 | int bt_ctf_writer_add_environment_field(struct bt_ctf_writer *writer, |
| 174 | const char *name, |
| 175 | const char *value) |
| 176 | { |
| 177 | int ret = -1; |
| 178 | |
| 179 | if (!writer || !name || !value) { |
| 180 | goto end; |
| 181 | } |
| 182 | |
| 183 | ret = bt_ctf_trace_add_environment_field(writer->trace, |
| 184 | name, value); |
| 185 | end: |
| 186 | return ret; |
| 187 | } |
| 188 | |
| 189 | int bt_ctf_writer_add_clock(struct bt_ctf_writer *writer, |
| 190 | struct bt_ctf_clock *clock) |
| 191 | { |
| 192 | int ret = -1; |
| 193 | |
| 194 | if (!writer || !clock) { |
| 195 | goto end; |
| 196 | } |
| 197 | |
| 198 | ret = bt_ctf_trace_add_clock(writer->trace, clock); |
| 199 | end: |
| 200 | return ret; |
| 201 | } |
| 202 | |
| 203 | char *bt_ctf_writer_get_metadata_string(struct bt_ctf_writer *writer) |
| 204 | { |
| 205 | char *metadata_string = NULL; |
| 206 | |
| 207 | if (!writer) { |
| 208 | goto end; |
| 209 | } |
| 210 | |
| 211 | metadata_string = bt_ctf_trace_get_metadata_string( |
| 212 | writer->trace); |
| 213 | end: |
| 214 | return metadata_string; |
| 215 | } |
| 216 | |
| 217 | void bt_ctf_writer_flush_metadata(struct bt_ctf_writer *writer) |
| 218 | { |
| 219 | int ret; |
| 220 | char *metadata_string = NULL; |
| 221 | |
| 222 | if (!writer) { |
| 223 | goto end; |
| 224 | } |
| 225 | |
| 226 | metadata_string = bt_ctf_trace_get_metadata_string( |
| 227 | writer->trace); |
| 228 | if (!metadata_string) { |
| 229 | goto end; |
| 230 | } |
| 231 | |
| 232 | if (lseek(writer->metadata_fd, 0, SEEK_SET) == (off_t)-1) { |
| 233 | perror("lseek"); |
| 234 | goto end; |
| 235 | } |
| 236 | |
| 237 | if (ftruncate(writer->metadata_fd, 0)) { |
| 238 | perror("ftruncate"); |
| 239 | goto end; |
| 240 | } |
| 241 | |
| 242 | ret = write(writer->metadata_fd, metadata_string, |
| 243 | strlen(metadata_string)); |
| 244 | if (ret < 0) { |
| 245 | perror("write"); |
| 246 | goto end; |
| 247 | } |
| 248 | end: |
| 249 | g_free(metadata_string); |
| 250 | } |
| 251 | |
| 252 | int bt_ctf_writer_set_byte_order(struct bt_ctf_writer *writer, |
| 253 | enum bt_ctf_byte_order byte_order) |
| 254 | { |
| 255 | int ret = 0; |
| 256 | |
| 257 | if (!writer || writer->frozen) { |
| 258 | ret = -1; |
| 259 | goto end; |
| 260 | } |
| 261 | |
| 262 | ret = bt_ctf_trace_set_byte_order(writer->trace, |
| 263 | byte_order); |
| 264 | end: |
| 265 | return ret; |
| 266 | } |
| 267 | |
| 268 | void bt_ctf_writer_get(struct bt_ctf_writer *writer) |
| 269 | { |
| 270 | if (!writer) { |
| 271 | return; |
| 272 | } |
| 273 | |
| 274 | bt_ctf_ref_get(&writer->ref_count); |
| 275 | } |
| 276 | |
| 277 | void bt_ctf_writer_put(struct bt_ctf_writer *writer) |
| 278 | { |
| 279 | if (!writer) { |
| 280 | return; |
| 281 | } |
| 282 | |
| 283 | bt_ctf_ref_put(&writer->ref_count, bt_ctf_writer_destroy); |
| 284 | } |
| 285 | |
| 286 | static |
| 287 | int create_stream_file(struct bt_ctf_writer *writer, |
| 288 | struct bt_ctf_stream *stream) |
| 289 | { |
| 290 | int fd; |
| 291 | GString *filename = g_string_new(stream->stream_class->name->str); |
| 292 | |
| 293 | if (stream->stream_class->name->len == 0) { |
| 294 | int64_t ret; |
| 295 | |
| 296 | ret = bt_ctf_stream_class_get_id(stream->stream_class); |
| 297 | if (ret < 0) { |
| 298 | fd = -1; |
| 299 | goto error; |
| 300 | } |
| 301 | |
| 302 | g_string_printf(filename, "stream_%" PRId64, ret); |
| 303 | } |
| 304 | |
| 305 | g_string_append_printf(filename, "_%" PRIu32, stream->id); |
| 306 | fd = openat(writer->trace_dir_fd, filename->str, |
| 307 | O_RDWR | O_CREAT | O_TRUNC, |
| 308 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 309 | error: |
| 310 | g_string_free(filename, TRUE); |
| 311 | return fd; |
| 312 | } |