125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/****************************************************************************
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* sched/mqueue/msgctl.c
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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 "mqueue/msg.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: msgctl
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*
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* Description:
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* System V message control operations.
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* msgctl() performs the control operation specified by cmd on the
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* System V message queue with identifier msqid.
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*
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* Input Parameters:
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* msqid - System V message queue identifier
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* cmd - Command operations
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* msqid_ds - Defines a message queue
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*
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* Returned Value:
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* On success, IPC_STAT, IPC_SET, and IPC_RMID return 0. A
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* successful IPC_INFO or MSG_INFO operation returns the index of
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* the highest used entry in the kernel's internal array recording
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* information about all message queues. (This information can be
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* used with repeated MSG_STAT or MSG_STAT_ANY operations to obtain
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* information about all queues on the system.) A successful
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* MSG_STAT or MSG_STAT_ANY operation returns the identifier of the
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* queue whose index was given in msqid.
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*
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* On failure, -1 is returned and errno is set to indicate the error.
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*
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****************************************************************************/
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int msgctl(int msqid, int cmd, FAR struct msqid_ds *buf)
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{
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FAR struct msgq_s *msgq;
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irqstate_t flags;
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int ret = OK;
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flags = enter_critical_section();
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msgq = nxmsg_lookup(msqid);
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if (msgq == NULL)
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{
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ret = -EINVAL;
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goto errout_with_critical;
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}
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switch (cmd)
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{
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case IPC_RMID:
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{
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nxmsg_free(msgq);
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break;
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}
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case IPC_SET:
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{
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if (buf == NULL)
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{
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ret = -EFAULT;
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break;
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}
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msgq->maxmsgs = buf->msg_qbytes / CONFIG_MQ_MAXMSGSIZE;
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break;
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}
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case IPC_STAT:
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{
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if (buf == NULL)
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{
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ret = -EFAULT;
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break;
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}
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buf->msg_qnum = list_length(&msgq->msglist);
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buf->msg_cbytes = buf->msg_qnum * CONFIG_MQ_MAXMSGSIZE;
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buf->msg_qbytes = msgq->maxmsgs * CONFIG_MQ_MAXMSGSIZE;
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break;
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}
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default:
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{
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ret = -EINVAL;
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break;
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}
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}
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errout_with_critical:
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leave_critical_section(flags);
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if (ret < 0)
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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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return ret;
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}
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