hybris/common/hooks_shm.h

   1 /*
   2  * Copyright (c) 2012 Carsten Munk <carsten.munk@gmail.com>
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  */
  17
  18 #ifndef HOOKS_SHM_H_
  19 #define HOOKS_SHM_H_
  20
  21 #include <stddef.h>
  22
  23 typedef unsigned int hybris_shm_pointer_t;
  24
  25 /*
  26  * Allocate a space in the shared memory region of hybris
  27  */
  28 hybris_shm_pointer_t hybris_shm_alloc(size_t size);
  29 /*
  30  * Test if the pointers points to the shm region
  31  */
  32 int hybris_is_pointer_in_shm(void *ptr);
  33 /*
  34  * Convert an offset pointer to the shared memory to an absolute pointer that can be used in user space
  35  * This function will return a NULL pointer if the handle does not actually point to the shm region
  36  */
  37 void *hybris_get_shmpointer(hybris_shm_pointer_t handle);
  38
  39 #endif
  40
  41 // vim:ts=4:sw=4:noexpandtab