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