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/****************************************************************************
* graphics/nxmu/nx_connect.c
*
* Copyright (C) 2008-2009, 2011-2012 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 <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <mqueue.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/nx/nx.h>
#include "nxfe.h"
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/* Each client is assigned a unique ID using the g_nxcid counter. That
* counter increments as each new counter is created and is* protected for
* thread safefy with g_nxlibsem. Note that these are the only global values
* in the NX implementation. This is because the client ID must be unique
* even across all server instances.
*
* NOTE: that client ID 0 is reserved for the server(s) themselves
*/
static sem_t g_nxlibsem = { 1 };
static uint32_t g_nxcid = 1;
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nx_connectinstance
*
* Description:
* Open a connection from a client to the NX server. One one client
* connection is normally needed per thread as each connection can host
* multiple windows.
*
* NOTES:
* - This function returns before the connection is fully instantiated.
* it is necessary to wait for the connection event before using the
* returned handle.
* - Multiple instances of the NX server may run at the same time,
* each with different message queue names.
*
* Input Parameters:
* svrmqname - The name for the server incoming message queue
*
* Return:
* Success: A non-NULL handle used with subsequent NX accesses
* Failure: NULL is returned and errno is set appropriately
*
****************************************************************************/
NXHANDLE nx_connectinstance(FAR const char *svrmqname)
{
FAR struct nxfe_conn_s *conn;
struct nxsvrmsg_s outmsg;
char climqname[NX_CLIENT_MXNAMELEN];
struct mq_attr attr;
int ret;
/* Sanity checking */
#ifdef CONFIG_DEBUG
if (!svrmqname)
{
errno = EINVAL;
return NULL;
}
#endif
/* Allocate the NX client structure */
conn = (FAR struct nxfe_conn_s *)zalloc(sizeof(struct nxfe_conn_s));
if (!conn)
{
errno = ENOMEM;
goto errout;
}
/* Create the client MQ name */
nxmu_semtake(&g_nxlibsem);
conn->cid = g_nxcid++;
nxmu_semgive(&g_nxlibsem);
sprintf(climqname, NX_CLIENT_MQNAMEFMT, conn->cid);
/* Open the client MQ for reading */
attr.mq_maxmsg = CONFIG_NX_MXCLIENTMSGS;
attr.mq_msgsize = NX_MXCLIMSGLEN;
attr.mq_flags = 0;
#ifdef CONFIG_NX_BLOCKING
conn->crdmq = mq_open(climqname, O_RDONLY|O_CREAT, 0666, &attr);
#else
conn->crdmq = mq_open(climqname, O_RDONLY|O_CREAT|O_NONBLOCK, 0666, &attr);
#endif
if (conn->crdmq == (mqd_t)-1)
{
gdbg("mq_open(%s) failed: %d\n", climqname, errno);
goto errout_with_conn;
}
/* Open the server MQ for writing */
attr.mq_maxmsg = CONFIG_NX_MXSERVERMSGS;
attr.mq_msgsize = NX_MXSVRMSGLEN;
attr.mq_flags = 0;
conn->cwrmq = mq_open(svrmqname, O_WRONLY|O_CREAT, 0666, &attr);
if (conn->cwrmq == (mqd_t)-1)
{
gdbg("mq_open(%s) failed: %d\n", svrmqname, errno);
goto errout_with_rmq;
}
/* Inform the server that this client exists */
outmsg.msgid = NX_SVRMSG_CONNECT;
outmsg.conn = conn;
ret = nxmu_sendserver(conn, &outmsg, sizeof(struct nxsvrmsg_s));
if (ret < 0)
{
gdbg("nxmu_sendserver failed: %d\n", errno);
goto errout_with_wmq;
}
#if 0
/* Now read until we get a response to this message. The server will
* respond with either (1) NX_CLIMSG_CONNECTED, in which case the state
* will change to NX_CLISTATE_CONNECTED, or (2) NX_CLIMSG_DISCONNECTED
* in which case, nx_message will fail with errno = EHOSTDOWN.
*/
do
{
ret = nx_eventhandler((NXHANDLE)conn);
if (ret < 0)
{
gdbg("nx_message failed: %d\n", errno);
goto errout_with_wmq;
}
usleep(300000);
}
while (conn->state != NX_CLISTATE_CONNECTED);
#endif
return (NXHANDLE)conn;
errout_with_wmq:
mq_close(conn->cwrmq);
errout_with_rmq:
mq_close(conn->crdmq);
errout_with_conn:
free(conn);
errout:
return NULL;
}
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