formats/ctf/writer/writer.c

   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 static
  51 void stream_flush_cb(struct bt_ctf_stream *stream,
  52                 struct bt_ctf_writer *writer);
  53
  54 struct bt_ctf_writer *bt_ctf_writer_create(const char *path)
  55 {
  56         struct bt_ctf_writer *writer = NULL;
  57
  58         if (!path) {
  59                 goto error;
  60         }
  61
  62         writer = g_new0(struct bt_ctf_writer, 1);
  63         if (!writer) {
  64                 goto error;
  65         }
  66
  67         bt_ctf_ref_init(&writer->ref_count);
  68         writer->path = g_string_new(path);
  69         if (!writer->path) {
  70                 goto error_destroy;
  71         }
  72
  73         writer->trace = bt_ctf_trace_create();
  74         if (!writer->trace) {
  75                 goto error_destroy;
  76         }
  77
  78         /* Create trace directory if necessary and open a metadata file */
  79         if (g_mkdir_with_parents(path, S_IRWXU | S_IRWXG)) {
  80                 perror("g_mkdir_with_parents");
  81                 goto error_destroy;
  82         }
  83
  84         writer->trace_dir_fd = open(path, O_RDONLY, S_IRWXU | S_IRWXG);
  85         if (writer->trace_dir_fd < 0) {
  86                 perror("open");
  87                 goto error_destroy;
  88         }
  89
  90         writer->metadata_fd = openat(writer->trace_dir_fd, "metadata",
  91                 O_WRONLY | O_CREAT | O_TRUNC,
  92                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
  93
  94         return writer;
  95
  96 error_destroy:
  97         unlinkat(writer->trace_dir_fd, "metadata", 0);
  98         bt_ctf_writer_destroy(&writer->ref_count);
  99         writer = NULL;
 100 error:
 101         return writer;
 102 }
 103
 104 void bt_ctf_writer_destroy(struct bt_ctf_ref *ref)
 105 {
 106         struct bt_ctf_writer *writer;
 107
 108         if (!ref) {
 109                 return;
 110         }
 111
 112         writer = container_of(ref, struct bt_ctf_writer, ref_count);
 113         bt_ctf_writer_flush_metadata(writer);
 114         if (writer->path) {
 115                 g_string_free(writer->path, TRUE);
 116         }
 117
 118         if (writer->trace_dir_fd > 0) {
 119                 if (close(writer->trace_dir_fd)) {
 120                         perror("close");
 121                 }
 122         }
 123
 124         if (writer->metadata_fd > 0) {
 125                 if (close(writer->metadata_fd)) {
 126                         perror("close");
 127                 }
 128         }
 129
 130         bt_ctf_trace_put(writer->trace);
 131         g_free(writer);
 132 }
 133
 134 struct bt_ctf_stream *bt_ctf_writer_create_stream(struct bt_ctf_writer *writer,
 135                 struct bt_ctf_stream_class *stream_class)
 136 {
 137         int stream_fd;
 138         struct bt_ctf_stream *stream = NULL;
 139
 140         if (!writer || !stream_class) {
 141                 goto error;
 142         }
 143
 144         stream = bt_ctf_trace_create_stream(writer->trace, stream_class);
 145         if (!stream) {
 146                 goto error;
 147         }
 148
 149         stream_fd = create_stream_file(writer, stream);
 150         if (stream_fd < 0 || bt_ctf_stream_set_fd(stream, stream_fd)) {
 151                 goto error;
 152         }
 153
 154         bt_ctf_stream_set_flush_callback(stream, (flush_func)stream_flush_cb,
 155                 writer);
 156         writer->frozen = 1;
 157         return stream;
 158
 159 error:
 160         bt_ctf_stream_put(stream);
 161         return NULL;
 162 }
 163
 164 int bt_ctf_writer_add_environment_field(struct bt_ctf_writer *writer,
 165                 const char *name,
 166                 const char *value)
 167 {
 168         int ret = -1;
 169
 170         if (!writer || !name || !value) {
 171                 goto end;
 172         }
 173
 174         ret = bt_ctf_trace_add_environment_field(writer->trace,
 175                 name, value);
 176 end:
 177         return ret;
 178 }
 179
 180 int bt_ctf_writer_add_clock(struct bt_ctf_writer *writer,
 181                 struct bt_ctf_clock *clock)
 182 {
 183         int ret = -1;
 184
 185         if (!writer || !clock) {
 186                 goto end;
 187         }
 188
 189         ret = bt_ctf_trace_add_clock(writer->trace, clock);
 190 end:
 191         return ret;
 192 }
 193
 194 char *bt_ctf_writer_get_metadata_string(struct bt_ctf_writer *writer)
 195 {
 196         char *metadata_string = NULL;
 197
 198         if (!writer) {
 199                 goto end;
 200         }
 201
 202         metadata_string = bt_ctf_trace_get_metadata_string(
 203                 writer->trace);
 204 end:
 205         return metadata_string;
 206 }
 207
 208 void bt_ctf_writer_flush_metadata(struct bt_ctf_writer *writer)
 209 {
 210         int ret;
 211         char *metadata_string = NULL;
 212
 213         if (!writer) {
 214                 goto end;
 215         }
 216
 217         metadata_string = bt_ctf_trace_get_metadata_string(
 218                 writer->trace);
 219         if (!metadata_string) {
 220                 goto end;
 221         }
 222
 223         if (lseek(writer->metadata_fd, 0, SEEK_SET) == (off_t)-1) {
 224                 perror("lseek");
 225                 goto end;
 226         }
 227
 228         if (ftruncate(writer->metadata_fd, 0)) {
 229                 perror("ftruncate");
 230                 goto end;
 231         }
 232
 233         ret = write(writer->metadata_fd, metadata_string,
 234                 strlen(metadata_string));
 235         if (ret < 0) {
 236                 perror("write");
 237                 goto end;
 238         }
 239 end:
 240         g_free(metadata_string);
 241 }
 242
 243 int bt_ctf_writer_set_byte_order(struct bt_ctf_writer *writer,
 244                 enum bt_ctf_byte_order byte_order)
 245 {
 246         int ret = 0;
 247
 248         if (!writer || writer->frozen) {
 249                 ret = -1;
 250                 goto end;
 251         }
 252
 253         ret = bt_ctf_trace_set_byte_order(writer->trace,
 254                 byte_order);
 255 end:
 256         return ret;
 257 }
 258
 259 void bt_ctf_writer_get(struct bt_ctf_writer *writer)
 260 {
 261         if (!writer) {
 262                 return;
 263         }
 264
 265         bt_ctf_ref_get(&writer->ref_count);
 266 }
 267
 268 void bt_ctf_writer_put(struct bt_ctf_writer *writer)
 269 {
 270         if (!writer) {
 271                 return;
 272         }
 273
 274         bt_ctf_ref_put(&writer->ref_count, bt_ctf_writer_destroy);
 275 }
 276
 277 static
 278 int create_stream_file(struct bt_ctf_writer *writer,
 279                 struct bt_ctf_stream *stream)
 280 {
 281         int fd;
 282         GString *filename = g_string_new(stream->stream_class->name->str);
 283
 284         g_string_append_printf(filename, "_%" PRIu32, stream->id);
 285         fd = openat(writer->trace_dir_fd, filename->str,
 286                 O_RDWR | O_CREAT | O_TRUNC,
 287                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
 288         g_string_free(filename, TRUE);
 289         return fd;
 290 }
 291
 292 static
 293 void stream_flush_cb(struct bt_ctf_stream *stream, struct bt_ctf_writer *writer)
 294 {
 295         struct bt_ctf_field *stream_id;
 296
 297         /* Start a new packet in the stream */
 298         if (stream->flushed_packet_count) {
 299                 /* ctf_init_pos has already initialized the first packet */
 300                 ctf_packet_seek(&stream->pos.parent, 0, SEEK_CUR);
 301         }
 302
 303         stream_id = bt_ctf_field_structure_get_field(
 304                 writer->trace->trace_packet_header, "stream_id");
 305         bt_ctf_field_unsigned_integer_set_value(stream_id, stream->stream_class->id);
 306         bt_ctf_field_put(stream_id);
 307
 308         /* Write the trace_packet_header */
 309         bt_ctf_field_serialize(writer->trace->trace_packet_header, &stream->pos);
 310 }