src/libsystemd/sd-bus/bus-slot.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2013 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include "sd-bus.h"
  21
  22 #include "alloc-util.h"
  23 #include "bus-control.h"
  24 #include "bus-objects.h"
  25 #include "bus-slot.h"
  26 #include "string-util.h"
  27
  28 sd_bus_slot *bus_slot_allocate(
  29                 sd_bus *bus,
  30                 bool floating,
  31                 BusSlotType type,
  32                 size_t extra,
  33                 void *userdata) {
  34
  35         sd_bus_slot *slot;
  36
  37         assert(bus);
  38
  39         slot = malloc0(offsetof(sd_bus_slot, reply_callback) + extra);
  40         if (!slot)
  41                 return NULL;
  42
  43         slot->n_ref = 1;
  44         slot->type = type;
  45         slot->bus = bus;
  46         slot->floating = floating;
  47         slot->userdata = userdata;
  48
  49         if (!floating)
  50                 sd_bus_ref(bus);
  51
  52         LIST_PREPEND(slots, bus->slots, slot);
  53
  54         return slot;
  55 }
  56
  57 _public_ sd_bus_slot* sd_bus_slot_ref(sd_bus_slot *slot) {
  58
  59         if (!slot)
  60                 return NULL;
  61
  62         assert(slot->n_ref > 0);
  63
  64         slot->n_ref++;
  65         return slot;
  66 }
  67
  68 void bus_slot_disconnect(sd_bus_slot *slot) {
  69         sd_bus *bus;
  70
  71         assert(slot);
  72
  73         if (!slot->bus)
  74                 return;
  75
  76         switch (slot->type) {
  77
  78         case BUS_REPLY_CALLBACK:
  79
  80                 if (slot->reply_callback.cookie != 0)
  81                         ordered_hashmap_remove(slot->bus->reply_callbacks, &slot->reply_callback.cookie);
  82
  83                 if (slot->reply_callback.timeout != 0)
  84                         prioq_remove(slot->bus->reply_callbacks_prioq, &slot->reply_callback, &slot->reply_callback.prioq_idx);
  85
  86                 break;
  87
  88         case BUS_FILTER_CALLBACK:
  89                 slot->bus->filter_callbacks_modified = true;
  90                 LIST_REMOVE(callbacks, slot->bus->filter_callbacks, &slot->filter_callback);
  91                 break;
  92
  93         case BUS_MATCH_CALLBACK:
  94
  95                 if (slot->match_added)
  96                         bus_remove_match_internal(slot->bus, slot->match_callback.match_string, slot->match_callback.cookie);
  97
  98                 slot->bus->match_callbacks_modified = true;
  99                 bus_match_remove(&slot->bus->match_callbacks, &slot->match_callback);
 100
 101                 free(slot->match_callback.match_string);
 102
 103                 break;
 104
 105         case BUS_NODE_CALLBACK:
 106
 107                 if (slot->node_callback.node) {
 108                         LIST_REMOVE(callbacks, slot->node_callback.node->callbacks, &slot->node_callback);
 109                         slot->bus->nodes_modified = true;
 110
 111                         bus_node_gc(slot->bus, slot->node_callback.node);
 112                 }
 113
 114                 break;
 115
 116         case BUS_NODE_ENUMERATOR:
 117
 118                 if (slot->node_enumerator.node) {
 119                         LIST_REMOVE(enumerators, slot->node_enumerator.node->enumerators, &slot->node_enumerator);
 120                         slot->bus->nodes_modified = true;
 121
 122                         bus_node_gc(slot->bus, slot->node_enumerator.node);
 123                 }
 124
 125                 break;
 126
 127         case BUS_NODE_OBJECT_MANAGER:
 128
 129                 if (slot->node_object_manager.node) {
 130                         LIST_REMOVE(object_managers, slot->node_object_manager.node->object_managers, &slot->node_object_manager);
 131                         slot->bus->nodes_modified = true;
 132
 133                         bus_node_gc(slot->bus, slot->node_object_manager.node);
 134                 }
 135
 136                 break;
 137
 138         case BUS_NODE_VTABLE:
 139
 140                 if (slot->node_vtable.node && slot->node_vtable.interface && slot->node_vtable.vtable) {
 141                         const sd_bus_vtable *v;
 142
 143                         for (v = slot->node_vtable.vtable; v->type != _SD_BUS_VTABLE_END; v++) {
 144                                 struct vtable_member *x = NULL;
 145
 146                                 switch (v->type) {
 147
 148                                 case _SD_BUS_VTABLE_METHOD: {
 149                                         struct vtable_member key;
 150
 151                                         key.path = slot->node_vtable.node->path;
 152                                         key.interface = slot->node_vtable.interface;
 153                                         key.member = v->x.method.member;
 154
 155                                         x = hashmap_remove(slot->bus->vtable_methods, &key);
 156                                         break;
 157                                 }
 158
 159                                 case _SD_BUS_VTABLE_PROPERTY:
 160                                 case _SD_BUS_VTABLE_WRITABLE_PROPERTY: {
 161                                         struct vtable_member key;
 162
 163                                         key.path = slot->node_vtable.node->path;
 164                                         key.interface = slot->node_vtable.interface;
 165                                         key.member = v->x.method.member;
 166
 167
 168                                         x = hashmap_remove(slot->bus->vtable_properties, &key);
 169                                         break;
 170                                 }}
 171
 172                                 free(x);
 173                         }
 174                 }
 175
 176                 free(slot->node_vtable.interface);
 177
 178                 if (slot->node_vtable.node) {
 179                         LIST_REMOVE(vtables, slot->node_vtable.node->vtables, &slot->node_vtable);
 180                         slot->bus->nodes_modified = true;
 181
 182                         bus_node_gc(slot->bus, slot->node_vtable.node);
 183                 }
 184
 185                 break;
 186
 187         default:
 188                 assert_not_reached("Wut? Unknown slot type?");
 189         }
 190
 191         bus = slot->bus;
 192
 193         slot->type = _BUS_SLOT_INVALID;
 194         slot->bus = NULL;
 195         LIST_REMOVE(slots, bus->slots, slot);
 196
 197         if (!slot->floating)
 198                 sd_bus_unref(bus);
 199 }
 200
 201 _public_ sd_bus_slot* sd_bus_slot_unref(sd_bus_slot *slot) {
 202
 203         if (!slot)
 204                 return NULL;
 205
 206         assert(slot->n_ref > 0);
 207
 208         if (slot->n_ref > 1) {
 209                 slot->n_ref--;
 210                 return NULL;
 211         }
 212
 213         bus_slot_disconnect(slot);
 214         free(slot->description);
 215         return mfree(slot);
 216 }
 217
 218 _public_ sd_bus* sd_bus_slot_get_bus(sd_bus_slot *slot) {
 219         assert_return(slot, NULL);
 220
 221         return slot->bus;
 222 }
 223
 224 _public_ void *sd_bus_slot_get_userdata(sd_bus_slot *slot) {
 225         assert_return(slot, NULL);
 226
 227         return slot->userdata;
 228 }
 229
 230 _public_ void *sd_bus_slot_set_userdata(sd_bus_slot *slot, void *userdata) {
 231         void *ret;
 232
 233         assert_return(slot, NULL);
 234
 235         ret = slot->userdata;
 236         slot->userdata = userdata;
 237
 238         return ret;
 239 }
 240
 241 _public_ sd_bus_message *sd_bus_slot_get_current_message(sd_bus_slot *slot) {
 242         assert_return(slot, NULL);
 243         assert_return(slot->type >= 0, NULL);
 244
 245         if (slot->bus->current_slot != slot)
 246                 return NULL;
 247
 248         return slot->bus->current_message;
 249 }
 250
 251 _public_ sd_bus_message_handler_t sd_bus_slot_get_current_handler(sd_bus_slot *slot) {
 252         assert_return(slot, NULL);
 253         assert_return(slot->type >= 0, NULL);
 254
 255         if (slot->bus->current_slot != slot)
 256                 return NULL;
 257
 258         return slot->bus->current_handler;
 259 }
 260
 261 _public_ void* sd_bus_slot_get_current_userdata(sd_bus_slot *slot) {
 262         assert_return(slot, NULL);
 263         assert_return(slot->type >= 0, NULL);
 264
 265         if (slot->bus->current_slot != slot)
 266                 return NULL;
 267
 268         return slot->bus->current_userdata;
 269 }
 270
 271 _public_ int sd_bus_slot_set_description(sd_bus_slot *slot, const char *description) {
 272         assert_return(slot, -EINVAL);
 273
 274         return free_and_strdup(&slot->description, description);
 275 }
 276
 277 _public_ int sd_bus_slot_get_description(sd_bus_slot *slot, const char **description) {
 278         assert_return(slot, -EINVAL);
 279         assert_return(description, -EINVAL);
 280         assert_return(slot->description, -ENXIO);
 281
 282         *description = slot->description;
 283         return 0;
 284 }