136 lines
5.8 KiB
C
136 lines
5.8 KiB
C
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/****************************************************************************
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* mm/shm/shmctl.c
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/shm.h>
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#include <sys/ipc.h>
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#include <errno.h>
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#ifdef CONFIG_MM_SHM
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: shmctl
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*
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* Description:
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* The shmctl() function provides a variety of shared memory control
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* operations as specified by cmd. The following values for cmd are
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* available:
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*
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* - IPC_STAT
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* Place the current value of each member of the shmid_ds data
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* structure associated with shmid into the structure pointed to by buf.
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* - IPC_SET
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* Set the value of the following members of the shmid_ds data
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* structure associated with shmid to the corresponding value found
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* in the structure pointed to by buf:
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*
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* shm_perm.uid
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* shm_perm.gid
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* shm_perm.mode Low-order nine bits.
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*
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* IPC_SET can only be executed by a process that has an effective
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* user ID equal to either that of a process with appropriate
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* privileges or to the value of shm_perm.cuid or shm_perm.uid in the
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* shmid_ds data structure associated with shmid.
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* - IPC_RMID
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* Remove the shared memory identifier specified by shmid from the
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* system and destroy the shared memory segment and shmid_ds data
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* structure associated with it. IPC_RMID can only be executed by a
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* process that has an effective user ID equal to either that of a
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* process with appropriate privileges or to the value of
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* shm_perm.cuid or shm_perm.uid in the shmid_ds data structure
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* associated with shmid.
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*
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* Input Parameters:
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* shmid - Shared memory identifier
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* cmd - shmctl() command
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* buf - Data associated with the shmctl() command
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*
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* Returned Value:
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* Upon successful completion, shmctl() will return 0; otherwise, it will
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* return -1 and set errno to indicate the error.
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*
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* - EACCES
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* The argument cmd is equal to IPC_STAT and the calling process does
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* not have read permission.
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* - EINVAL
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* The value of shmid is not a valid shared memory identifier, or the
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* value of cmd is not a valid command.
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* - EPERM
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* The argument cmd is equal to IPC_RMID or IPC_SET and the effective
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* user ID of the calling process is not equal to that of a process
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* with appropriate privileges and it is not equal to the value of
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* shm_perm.cuid or shm_perm.uid in the data structure associated with
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* shmid.
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* - EOVERFLOW
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* The cmd argument is IPC_STAT and the gid or uid value is too large
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* to be stored in the structure pointed to by the buf argument.
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*
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****************************************************************************/
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int shmctl(int shmid, int cmd, struct shmid_ds *buf)
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{
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#warning Not implemented
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set_errno(ENOSYS);
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return ERROR;
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}
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#endif /* CONFIG_MM_SHM */
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