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px4-firmware/apps/nshlib/nsh_builtin.c

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/****************************************************************************
* apps/nshlib/nsh_builtin.c
*
* Originally by:
*
* Copyright (C) 2011 Uros Platise. All rights reserved.
* Author: Uros Platise <uros.platise@isotel.eu>
*
* With subsequent updates, modifications, and general maintenance by:
*
* Copyright (C) 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>
#ifdef CONFIG_SCHED_WAITPID
# include <sys/wait.h>
#endif
#include <stdbool.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include <nuttx/binfmt/builtin.h>
#include <apps/builtin.h>
#include "nsh.h"
#include "nsh_console.h"
#ifdef CONFIG_NSH_BUILTIN_APPS
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nsh_builtin
*
* Description:
* Attempt to execute the application task whose name is 'cmd'
*
* Returned Value:
* <0 If exec_builtin() fails, then the negated errno value
* is returned.
* -1 (ERROR) if the application task corresponding to 'cmd' could not
* be started (possibly because it doesn not exist).
* 0 (OK) if the application task corresponding to 'cmd' was
* and successfully started. If CONFIG_SCHED_WAITPID is
* defined, this return value also indicates that the
* application returned successful status (EXIT_SUCCESS)
* 1 If CONFIG_SCHED_WAITPID is defined, then this return value
* indicates that the application task was spawned successfully
* but returned failure exit status.
*
****************************************************************************/
int nsh_builtin(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd,
FAR char **argv, FAR const char *redirfile, int oflags)
{
int ret = OK;
/* Lock the scheduler to prevent the application from running until the
* waitpid() has been called.
*/
sched_lock();
/* Try to find and execute the command within the list of builtin
* applications.
*/
ret = exec_builtin(cmd, (FAR const char **)argv, redirfile, oflags);
if (ret >= 0)
{
/* The application was successfully started with pre-emption disabled.
* In the simplest cases, the application will not have run because the
* the scheduler is locked. but in the case were I/O redirected, a
* proxy task ran and, as result, so may have the application.
*
* If the application did not run and if the application was not
* backgrounded, then we need to wait here for the application to
* exit. This only works works with the following options:
*
* - CONFIG_NSH_DISABLEBG - Do not run commands in background
* - CONFIG_SCHED_WAITPID - Required to run external commands in
* foreground
*/
#ifdef CONFIG_SCHED_WAITPID
/* Check if the application is still running */
if (kill(ret, 0) < 0)
{
/* It is not running. In this case, we have no idea if the
* application ran successfully or not. Let's assume that is
* did.
*/
return 0;
}
/* CONFIG_SCHED_WAITPID is selected, so we may run the command in
* foreground unless we were specifically requested to run the command
* in background (and running commands in background is enabled).
*/
# ifndef CONFIG_NSH_DISABLEBG
if (vtbl->np.np_bg == false)
# endif /* CONFIG_NSH_DISABLEBG */
{
int rc = 0;
/* Wait for the application to exit. Since we have locked the
* scheduler above, we know that the application has not yet
* started and there is no possibility that it has already exited.
* The scheduler will be unlocked while waitpid is waiting and the
* application will be able to run.
*/
ret = waitpid(ret, &rc, 0);
if (ret >= 0)
{
/* We can't return the exact status (nsh has nowhere to put it)
* so just pass back zero/nonzero in a fashion that doesn't look
* like an error.
*/
ret = (rc == 0) ? OK : 1;
/* TODO: Set the environment variable '?' to a string corresponding
* to WEXITSTATUS(rc) so that $? will expand to the exit status of
* the most recently executed task.
*/
}
}
# ifndef CONFIG_NSH_DISABLEBG
else
# endif /* CONFIG_NSH_DISABLEBG */
#endif /* CONFIG_SCHED_WAITPID */
/* We get here if either:
*
* - CONFIG_SCHED_WAITPID is not selected meaning that all commands
* have to be run in background, or
* - CONFIG_SCHED_WAITPID and CONFIG_NSH_DISABLEBG are both selected, but the
* user requested to run the command in background.
*
* NOTE that the case of a) CONFIG_SCHED_WAITPID is not selected and
* b) CONFIG_NSH_DISABLEBG selected cannot be supported. In that event, all
* commands will have to run in background. The waitpid() API must be
* available to support running the command in foreground.
*/
#if !defined(CONFIG_SCHED_WAITPID) || !defined(CONFIG_NSH_DISABLEBG)
{
struct sched_param param;
sched_getparam(ret, &param);
nsh_output(vtbl, "%s [%d:%d]\n", cmd, ret, param.sched_priority);
/* Backgrounded commands always 'succeed' as long as we can start
* them.
*/
ret = OK;
}
#endif /* !CONFIG_SCHED_WAITPID || !CONFIG_NSH_DISABLEBG */
}
sched_unlock();
/* If exec_builtin() or waitpid() failed, then return -1 (ERROR) with the
* errno value set appropriately.
*/
if (ret < 0)
{
return ERROR;
}
return ret;
}
#endif /* CONFIG_NSH_BUILTIN_APPS */
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