libringbuffer/shm_types.h

   1 /*
   2  * SPDX-License-Identifier: LGPL-2.1-only
   3  *
   4  * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #ifndef _LIBRINGBUFFER_SHM_TYPES_H
   8 #define _LIBRINGBUFFER_SHM_TYPES_H
   9
  10 #include <stdint.h>
  11 #include <stddef.h>
  12 #include <limits.h>
  13 #include "shm_internal.h"
  14
  15 struct channel;
  16
  17 enum shm_object_type {
  18         SHM_OBJECT_SHM,
  19         SHM_OBJECT_MEM,
  20 };
  21
  22 struct shm_object {
  23         enum shm_object_type type;
  24         size_t index;   /* within the object table */
  25         int shm_fd;     /* shm fd */
  26         int wait_fd[2]; /* fd for wait/wakeup */
  27         char *memory_map;
  28         size_t memory_map_size;
  29         uint64_t allocated_len;
  30         int shm_fd_ownership;
  31 };
  32
  33 struct shm_object_table {
  34         size_t size;
  35         size_t allocated_len;
  36         struct shm_object objects[];
  37 };
  38
  39 struct lttng_ust_shm_handle {
  40         struct shm_object_table *table;
  41         DECLARE_SHMP(struct channel, chan);
  42 };
  43
  44 #endif /* _LIBRINGBUFFER_SHM_TYPES_H */