formats/bt-dummy/bt-dummy.c

   1 /*
   2  * BabelTrace - Dummy Output
   3  *
   4  * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
   5  *
   6  * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24  * SOFTWARE.
  25  */
  26
  27 #include <babeltrace/ctf-text/types.h>
  28 #include <babeltrace/format.h>
  29 #include <babeltrace/babeltrace-internal.h>
  30 #include <inttypes.h>
  31 #include <sys/mman.h>
  32 #include <errno.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <fcntl.h>
  36 #include <dirent.h>
  37 #include <glib.h>
  38 #include <unistd.h>
  39 #include <stdlib.h>
  40
  41 void bt_dummy_hook(void)
  42 {
  43         /*
  44          * Dummy function to prevent the linker from discarding this format as
  45          * "unused" in static builds.
  46          */
  47 }
  48
  49 static
  50 int bt_dummy_write_event(struct bt_stream_pos *ppos, struct ctf_stream_definition *stream)
  51 {
  52         return 0;
  53 }
  54
  55 static
  56 struct bt_trace_descriptor *bt_dummy_open_trace(const char *path, int flags,
  57                 void (*packet_seek)(struct bt_stream_pos *pos, size_t index,
  58                         int whence), FILE *metadata_fp)
  59 {
  60         struct ctf_text_stream_pos *pos;
  61
  62         pos = g_new0(struct ctf_text_stream_pos, 1);
  63         pos->parent.rw_table = NULL;
  64         pos->parent.event_cb = bt_dummy_write_event;
  65         pos->parent.trace = &pos->trace_descriptor;
  66         return &pos->trace_descriptor;
  67 }
  68
  69 static
  70 int bt_dummy_close_trace(struct bt_trace_descriptor *td)
  71 {
  72         struct ctf_text_stream_pos *pos =
  73                 container_of(td, struct ctf_text_stream_pos,
  74                         trace_descriptor);
  75         free(pos);
  76         return 0;
  77 }
  78
  79 static
  80 struct bt_format bt_dummy_format = {
  81         .open_trace = bt_dummy_open_trace,
  82         .close_trace = bt_dummy_close_trace,
  83 };
  84
  85 static
  86 void __attribute__((constructor)) bt_dummy_init(void)
  87 {
  88         int ret;
  89
  90         bt_dummy_format.name = g_quark_from_string("dummy");
  91         ret = bt_register_format(&bt_dummy_format);
  92         assert(!ret);
  93 }
  94
  95 static
  96 void __attribute__((destructor)) bt_dummy_exit(void)
  97 {
  98         bt_unregister_format(&bt_dummy_format);
  99 }