libringbuffer/shm_types.h

   1 #ifndef _LIBRINGBUFFER_SHM_TYPES_H
   2 #define _LIBRINGBUFFER_SHM_TYPES_H
   3
   4 /*
   5  * libringbuffer/shm_types.h
   6  *
   7  * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; only
  12  * version 2.1 of the License.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include <stdint.h>
  25 #include <stddef.h>
  26 #include <limits.h>
  27 #include "shm_internal.h"
  28
  29 struct channel;
  30
  31 enum shm_object_type {
  32         SHM_OBJECT_SHM,
  33         SHM_OBJECT_MEM,
  34 };
  35
  36 struct shm_object {
  37         enum shm_object_type type;
  38         size_t index;   /* within the object table */
  39         int shm_fd;     /* shm fd */
  40         int wait_fd[2]; /* fd for wait/wakeup */
  41         char *memory_map;
  42         size_t memory_map_size;
  43         uint64_t allocated_len;
  44         int shm_fd_ownership;
  45 };
  46
  47 struct shm_object_table {
  48         size_t size;
  49         size_t allocated_len;
  50         struct shm_object objects[];
  51 };
  52
  53 struct lttng_ust_shm_handle {
  54         struct shm_object_table *table;
  55         DECLARE_SHMP(struct channel, chan);
  56 };
  57
  58 #endif /* _LIBRINGBUFFER_SHM_TYPES_H */