107 lines
3.6 KiB
C
107 lines
3.6 KiB
C
/****************************************************************************
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* include/sys/shm.h
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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#define SHM_R 0x03 /* or S_IRUGO */
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#define SHM_W 0x04 /* or S_IWUGO */
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#define SHM_HUGETLB 0x05 /* segment will use huge TLB pages */
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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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