kernel2/ipc.c

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation, either version 3 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include <ipc.h>
  20 #include <llist.h>
  21 #include <ipc/msg.h>
  22 #include <ipc/sem.h>
  23 #include <ipc/shm.h>
  24
  25 /**
  26  * Initializes IPC
  27  *  @return Success?
  28  */
  29 int ipc_init() {
  30   ipc_objects = llist_create();
  31   ipc_lastid = 0;
  32   if (ipc_msg_init()==-1) return -1;
  33   if (ipc_sem_init()==-1) return -1;
  34   if (ipc_shm_init()==-1) return -1;
  35   return 0;
  36 }
  37
  38 /**
  39  * Finds an IPC object
  40  *  @param key IPC Key
  41  *  @param id IPC object's ID
  42  *  @return IPC object
  43  */
  44 void *ipc_find(key_t key,id_t id,int type) {
  45   size_t i;
  46   ipc_obj_t *ipc;
  47   for (i=0;(ipc = llist_get(ipc_objects,i));i++) {
  48     if (ipc->type==type) {
  49       if ((ipc->key==key || key==-1) && (ipc->id==id || id==-1)) return ipc;
  50     }
  51   }
  52   return NULL;
  53 }