114 lines
4.1 KiB
C
114 lines
4.1 KiB
C
/****************************************************************************
|
|
* include/sys/shm.h
|
|
*
|
|
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __INCLUDE_SYS_SHM_H
|
|
#define __INCLUDE_SYS_SHM_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/ipc.h>
|
|
#include <time.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-Processor Definitions
|
|
****************************************************************************/
|
|
|
|
#define SHM_RDONLY 0x01 /* Attach read-only (else read-write) */
|
|
#define SHM_RND 0x02 /* Round attach address to SHMLBA */
|
|
|
|
/* Segment low boundary address multiple */
|
|
|
|
#ifdef CONFIG_SHM_SHMLBA
|
|
# define SHMLBA CONFIG_SHM_SHMLBA
|
|
#else
|
|
# define SHMLBA 0x0
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Type Definitions
|
|
****************************************************************************/
|
|
|
|
/* Unsigned integer used for the number of current attaches that must be
|
|
* able to store values at least as large as a type unsigned short.
|
|
*/
|
|
|
|
typedef unsigned short shmatt_t;
|
|
|
|
struct shmid_ds
|
|
{
|
|
struct ipc_perm shm_perm; /* Operation permission structure */
|
|
size_t shm_segsz; /* Size of segment in bytes */
|
|
pid_t shm_lpid; /* Process ID of last shared memory operation */
|
|
pid_t shm_cpid; /* Process ID of creator */
|
|
shmatt_t shm_nattch; /* Number of current attaches */
|
|
time_t shm_atime; /* Time of last shmat() */
|
|
time_t shm_dtime; /* Time of last shmdt() */
|
|
time_t shm_ctime; /* Time of last change by shmctl() */
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
#define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
FAR void *shmat(int shmid, FAR const void *shmaddr, int shmflg);
|
|
int shmctl(int shmid, int cmd, FAR struct shmid_ds *buf);
|
|
int shmdt(FAR const void *shmaddr);
|
|
int shmget(key_t key, size_t size, int shmflg);
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* __INCLUDE_SYS_SHM_H */
|