plugins/ctf/fs/fs.c

   1 /*
   2  * fs.c
   3  *
   4  * Babeltrace CTF file system Reader Component
   5  *
   6  * Copyright 2016 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/plugin/plugin-system.h>
  30 #include <babeltrace/plugin/notification/iterator.h>
  31 #include <glib.h>
  32 #include <assert.h>
  33 #include "fs-internal.h"
  34
  35 static bool ctf_fs_debug;
  36
  37 static
  38 struct bt_notification *ctf_fs_iterator_get(
  39                 struct bt_notification_iterator *iterator)
  40 {
  41         return NULL;
  42 }
  43
  44 static
  45 enum bt_notification_iterator_status ctf_fs_iterator_next(
  46                 struct bt_notification_iterator *iterator)
  47 {
  48         return BT_NOTIFICATION_ITERATOR_STATUS_UNSUPPORTED;
  49 }
  50
  51 static
  52 void ctf_fs_iterator_destroy_data(struct ctf_fs_iterator *ctf_it)
  53 {
  54         g_free(ctf_it);
  55 }
  56
  57 static
  58 void ctf_fs_iterator_destroy(struct bt_notification_iterator *it)
  59 {
  60         void *data = bt_notification_iterator_get_private_data(it);
  61
  62         ctf_fs_iterator_destroy_data(data);
  63 }
  64
  65 static
  66 enum bt_component_status ctf_fs_iterator_init(struct bt_component *source,
  67                 struct bt_notification_iterator *it)
  68 {
  69         enum bt_component_status ret = BT_COMPONENT_STATUS_OK;
  70         struct ctf_fs_iterator *ctf_it;
  71
  72         assert(source && it);
  73         ctf_it = g_new0(struct ctf_fs_iterator, 1);
  74         if (!ctf_it) {
  75                 ret = BT_COMPONENT_STATUS_NOMEM;
  76                 goto end;
  77         }
  78
  79         ret = bt_notification_iterator_set_get_cb(it, ctf_fs_iterator_get);
  80         if (ret) {
  81                 goto error;
  82         }
  83
  84         ret = bt_notification_iterator_set_next_cb(it, ctf_fs_iterator_next);
  85         if (ret) {
  86                 goto error;
  87         }
  88
  89         ret = bt_notification_iterator_set_destroy_cb(it,
  90                         ctf_fs_iterator_destroy);
  91         if (ret) {
  92                 goto error;
  93         }
  94
  95         ret = bt_notification_iterator_set_private_data(it, ctf_it);
  96         if (ret) {
  97                 goto error;
  98         }
  99 end:
 100         return ret;
 101 error:
 102         (void) bt_notification_iterator_set_private_data(it, NULL);
 103         ctf_fs_iterator_destroy_data(ctf_it);
 104         return ret;
 105 }
 106
 107 static
 108 struct ctf_fs_component *ctf_fs_create(struct bt_value *params)
 109 {
 110         return g_new0(struct ctf_fs_component, 1);
 111 }
 112
 113 static
 114 void ctf_fs_destroy_data(struct ctf_fs_component *component)
 115 {
 116         g_free(component);
 117 }
 118
 119 static
 120 void ctf_fs_destroy(struct bt_component *component)
 121 {
 122         void *data = bt_component_get_private_data(component);
 123
 124         ctf_fs_destroy_data(data);
 125 }
 126
 127 BT_HIDDEN
 128 enum bt_component_status ctf_fs_init(struct bt_component *source,
 129                 struct bt_value *params)
 130 {
 131         struct ctf_fs_component *ctf_fs;
 132         enum bt_component_status ret = BT_COMPONENT_STATUS_OK;
 133
 134         assert(source);
 135         ctf_fs_debug = g_strcmp0(getenv("CTF_FS_DEBUG"), "1") == 0;
 136         ctf_fs = ctf_fs_create(params);
 137         if (!ctf_fs) {
 138                 ret = BT_COMPONENT_STATUS_NOMEM;
 139                 goto end;
 140         }
 141
 142         ret = bt_component_set_destroy_cb(source, ctf_fs_destroy);
 143         if (ret != BT_COMPONENT_STATUS_OK) {
 144                 goto error;
 145         }
 146
 147         ret = bt_component_set_private_data(source, ctf_fs);
 148         if (ret != BT_COMPONENT_STATUS_OK) {
 149                 goto error;
 150         }
 151
 152         ret = bt_component_source_set_iterator_init_cb(source,
 153                         ctf_fs_iterator_init);
 154         if (ret != BT_COMPONENT_STATUS_OK) {
 155                 goto error;
 156         }
 157 end:
 158         return ret;
 159 error:
 160         (void) bt_component_set_private_data(source, NULL);
 161         ctf_fs_destroy_data(ctf_fs);
 162         return ret;
 163 }