forked from Archive/PX4-Autopilot
188 lines
6.6 KiB
C
188 lines
6.6 KiB
C
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/****************************************************************************
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* apps/nshlib/nsh_apps.c
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*
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* Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
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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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* 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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#ifdef CONFIG_SCHED_WAITPID
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# include <sys/wait.h>
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#endif
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#include <stdbool.h>
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#include <errno.h>
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#include <string.h>
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#include <apps/apps.h>
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#include "nsh.h"
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#include "nsh_console.h"
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#ifdef CONFIG_NSH_BUILTIN_APPS
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/****************************************************************************
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* Definitions
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****************************************************************************/
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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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* Public 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: nsh_execapp
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*
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* Description:
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* Attempt to execute the application task whose name is 'cmd'
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*
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* Returned Value:
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* <0 If exec_namedapp() fails, then the negated errno value
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* is returned.
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* -1 (ERROR) if the application task corresponding to 'cmd' could not
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* be started (possibly because it doesn not exist).
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* 0 (OK) if the application task corresponding to 'cmd' was
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* and successfully started. If CONFIG_SCHED_WAITPID is
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* defined, this return value also indicates that the
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* application returned successful status (EXIT_SUCCESS)
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* 1 If CONFIG_SCHED_WAITPID is defined, then this return value
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* indicates that the application task was spawned successfully
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* but returned failure exit status.
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*
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****************************************************************************/
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int nsh_execapp(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd,
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FAR char **argv)
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{
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int ret = OK;
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/* Lock the scheduler to prevent the application from running until the
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* waitpid() has been called.
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*/
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sched_lock();
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/* Try to find and execute the command within the list of builtin
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* applications.
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*/
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ret = exec_namedapp(cmd, (FAR const char **)argv);
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if (ret >= 0)
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{
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/* The application was successfully started (but still blocked because the
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* scheduler is locked). If the application was not backgrounded, then we
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* need to wait here for the application to exit.
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*/
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#ifdef CONFIG_SCHED_WAITPID
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if (vtbl->np.np_bg == false)
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{
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int rc = 0;
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/* Wait for the application to exit. Since we have locked the
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* scheduler above, we know that the application has not yet
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* started and there is no possibility that it has already exited.
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* The scheduler will be unlocked while waitpid is waiting and the
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* application will be able to run.
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*/
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ret = waitpid(ret, &rc, 0);
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if (ret >= 0)
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{
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/* We can't return the exact status (nsh has nowhere to put it)
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* so just pass back zero/nonzero in a fashion that doesn't look
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* like an error.
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*/
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ret = (rc == 0) ? OK : 1;
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/* TODO: Set the environment variable '?' to a string corresponding
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* to WEXITSTATUS(rc) so that $? will expand to the exit status of
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* the most recently executed task.
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*/
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}
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}
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else
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#endif
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{
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struct sched_param param;
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sched_getparam(0, ¶m);
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nsh_output(vtbl, "%s [%d:%d]\n", cmd, ret, param.sched_priority);
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/* Backgrounded commands always 'succeed' as long as we can start
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* them.
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*/
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ret = OK;
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}
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}
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sched_unlock();
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/* If exec_namedapp() or waitpid() failed, then return the negated errno
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* value.
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*/
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if (ret < 0)
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{
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return -errno;
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}
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return ret;
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}
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#endif /* CONFIG_NSH_BUILTIN_APPS */
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