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