188 lines
6.2 KiB
C
188 lines
6.2 KiB
C
/****************************************************************************
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* apps/namedaps/exec_namedapp.c
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*
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* Copyright (C) 2011 Uros Platise. All rights reserved.
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* Author: Uros Platise <uros.platise@isotel.eu>
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*
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* With updates, modifications, and general maintenance by:
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Auther: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <apps/apps.h>
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#include <sched.h>
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#include <string.h>
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#include <errno.h>
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#include "namedapp.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: namedapp_getname
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*
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* Description:
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* Return the name of the application at index in the table of named
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* applications.
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*
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****************************************************************************/
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const char *namedapp_getname(int index)
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{
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if (index < 0 || index >= number_namedapps())
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{
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return NULL;
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}
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return namedapps[index].name;
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}
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/****************************************************************************
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* Name: namedapp_isavail
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*
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* Description:
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* Return the index into the table of applications for the applicaiton with
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* the name 'appname'.
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*
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****************************************************************************/
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int namedapp_isavail(FAR const char *appname)
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{
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int i;
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for (i = 0; namedapps[i].name; i++)
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{
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if (!strcmp(namedapps[i].name, appname))
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{
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return i;
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}
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}
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set_errno(ENOENT);
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return ERROR;
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}
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/****************************************************************************
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* Name: namedapp_isavail
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*
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* Description:
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* Execute the application with name 'appname', providing the arguments
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* in the argv[] array.
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*
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* Returned Value:
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* On success, the task ID of the named application is returned. On
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* failure, -1 (ERROR) is returned an the errno value is set appropriately.
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*
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****************************************************************************/
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int exec_namedapp(FAR const char *appname, FAR const char **argv)
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{
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pid_t pid;
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int index;
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/* Verify that an application with this name exists */
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index = namedapp_isavail(appname);
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if (index >= 0)
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{
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/* Disable pre-emption. This means that although we start the named
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* application here, it will not actually run until pre-emption is
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* re-enabled below.
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*/
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sched_lock();
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/* Start the named application task */
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pid = TASK_CREATE(namedapps[index].name, namedapps[index].priority,
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namedapps[index].stacksize, namedapps[index].main,
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(argv) ? &argv[1] : (const char **)NULL);
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/* If robin robin scheduling is enabled, then set the scheduling policy
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* of the new task to SCHED_RR before it has a chance to run.
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*/
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#if CONFIG_RR_INTERVAL > 0
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if (pid > 0)
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{
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struct sched_param param;
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/* Pre-emption is disabled so the task creation and the
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* following operation will be atomic. The priority of the
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* new task cannot yet have changed from its initial value.
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*/
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param.sched_priority = namedapps[index].priority;
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sched_setscheduler(pid, SCHED_RR, ¶m);
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}
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#endif
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/* Now let the named application run */
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sched_unlock();
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/* Return the task ID of the new task if the task was sucessfully
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* started. Otherwise, pid will be ERROR (and the errno value will
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* be set appropriately).
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*/
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return pid;
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}
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/* Return ERROR with errno set appropriately */
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return ERROR;
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}
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