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- /****************************************************************************
- * libs/libnx/nxmu/nx_connect.c
- *
- * Copyright (C) 2008-2009, 2011-2013 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 <semaphore.h>
- #include <mqueue.h>
- #include <errno.h>
- #include <debug.h>
- #include <nuttx/signal.h>
- #include <nuttx/semaphore.h>
- #include <nuttx/nx/nx.h>
- #include <nuttx/nx/nxmu.h>
- #include "nxcontext.h"
- /****************************************************************************
- * 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 safety 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 = SEM_INITIALIZER(1);
- static uint32_t g_nxcid = 1;
- /****************************************************************************
- * 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
- *
- * Returned Value:
- * 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_FEATURES
- if (!svrmqname)
- {
- set_errno(EINVAL);
- return NULL;
- }
- #endif
- /* Allocate the NX client structure */
- conn = (FAR struct nxfe_conn_s *)lib_uzalloc(sizeof(struct nxfe_conn_s));
- if (!conn)
- {
- set_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)
- {
- gerr("ERROR: 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)
- {
- gerr("ERROR: 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)
- {
- gerr("ERROR: 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)
- {
- gerr("ERROR: nx_message failed: %d\n", errno);
- goto errout_with_wmq;
- }
- _SIG_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:
- lib_ufree(conn);
- errout:
- return NULL;
- }
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