122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
/****************************************************************************
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* sched/mqueue/mq_getattr.c
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <errno.h>
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#include <mqueue.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/mqueue.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: file_mq_getattr
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*
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* Description:
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* This functions gets status information and attributes
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* associated with the specified message queue.
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*
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* Input Parameters:
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* mq - Message queue descriptor
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* mq_stat - Buffer in which to return attributes
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*
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* Returned Value:
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* This is an internal OS interface and should not be used by applications.
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* It follows the NuttX internal error return policy: Zero (OK) is
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* returned on success. A negated errno value is returned on failure.
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*
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* Assumptions:
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*
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****************************************************************************/
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int file_mq_getattr(FAR struct file *mq, FAR struct mq_attr *mq_stat)
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{
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FAR struct mqueue_inode_s *msgq;
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FAR struct inode *inode;
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if (!mq || !mq_stat)
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{
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return -EINVAL;
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}
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inode = mq->f_inode;
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if (!inode)
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{
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return -EBADF;
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}
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msgq = inode->i_private;
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mq_stat->mq_maxmsg = msgq->maxmsgs;
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mq_stat->mq_msgsize = msgq->maxmsgsize;
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mq_stat->mq_flags = mq->f_oflags;
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mq_stat->mq_curmsgs = msgq->nmsgs;
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return 0;
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}
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/****************************************************************************
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* Name: mq_getattr
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*
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* Description:
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* This functions gets status information and attributes
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* associated with the specified message queue.
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*
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* Input Parameters:
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* mqdes - Message queue descriptor
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* mq_stat - Buffer in which to return attributes
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*
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* Returned Value:
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* 0 (OK) if attributes provided, -1 (ERROR) otherwise.
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*
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* Assumptions:
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*
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****************************************************************************/
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int mq_getattr(mqd_t mqdes, struct mq_attr *mq_stat)
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{
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FAR struct file *filep;
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int ret;
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ret = fs_getfilep(mqdes, &filep);
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if (ret >= 0)
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{
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ret = file_mq_getattr(filep, mq_stat);
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fs_putfilep(filep);
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if (ret >= 0)
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{
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return OK;
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}
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}
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set_errno(-ret);
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return ERROR;
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}
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