forked from Archive/PX4-Autopilot
315 lines
11 KiB
C
315 lines
11 KiB
C
/****************************************************************************
|
|
* apps/nshlib/nsh_fileapps.c
|
|
*
|
|
* Copyright (C) 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 <spawn.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
|
|
#include "nsh.h"
|
|
#include "nsh_console.h"
|
|
|
|
#ifdef CONFIG_NSH_FILE_APPS
|
|
|
|
/****************************************************************************
|
|
* Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Types
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: nsh_fileapp
|
|
*
|
|
* 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_fileapp(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd,
|
|
FAR char **argv, FAR const char *redirfile, int oflags)
|
|
{
|
|
posix_spawn_file_actions_t file_actions;
|
|
posix_spawnattr_t attr;
|
|
pid_t pid;
|
|
int ret;
|
|
|
|
/* Initialize the attributes file actions structure */
|
|
|
|
ret = posix_spawn_file_actions_init(&file_actions);
|
|
if (ret != 0)
|
|
{
|
|
/* posix_spawn_file_actions_init returns a positive errno value on
|
|
* failure.
|
|
*/
|
|
|
|
nsh_output(vtbl, g_fmtcmdfailed, cmd, "posix_spawn_file_actions_init",
|
|
NSH_ERRNO_OF(ret));
|
|
goto errout;
|
|
}
|
|
|
|
ret = posix_spawnattr_init(&attr);
|
|
if (ret != 0)
|
|
{
|
|
/* posix_spawnattr_init returns a positive errno value on failure. */
|
|
|
|
nsh_output(vtbl, g_fmtcmdfailed, cmd, "posix_spawnattr_init",
|
|
NSH_ERRNO);
|
|
goto errout_with_actions;
|
|
}
|
|
|
|
/* Handle re-direction of output */
|
|
|
|
if (redirfile)
|
|
{
|
|
ret = posix_spawn_file_actions_addopen(&file_actions, 1, redirfile,
|
|
oflags, 0644);
|
|
if (ret != 0)
|
|
{
|
|
/* posix_spawn_file_actions_addopen returns a positive errno
|
|
* value on failure.
|
|
*/
|
|
|
|
nsh_output(vtbl, g_fmtcmdfailed, cmd,
|
|
"posix_spawn_file_actions_addopen",
|
|
NSH_ERRNO);
|
|
goto errout_with_attrs;
|
|
}
|
|
}
|
|
|
|
/* Lock the scheduler in an attempt to prevent the application from
|
|
* running until waitpid() has been called.
|
|
*/
|
|
|
|
sched_lock();
|
|
|
|
/* Execute the program. posix_spawnp returns a positive errno value on
|
|
* failure.
|
|
*/
|
|
|
|
ret = posix_spawnp(&pid, cmd, &file_actions, &attr, &argv[1], NULL);
|
|
if (ret == OK)
|
|
{
|
|
/* 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 where I/O was redirected, a
|
|
* proxy task ran and broke our lock. As result, the application may
|
|
* have aso ran if its priority was higher than than the priority of
|
|
* this thread.
|
|
*
|
|
* If the application did not run to completion 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
|
|
|
|
/* 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. We did lock the scheduler
|
|
* above, but that does not guarantee that the application did not
|
|
* already run to completion in the case where I/O was redirected.
|
|
* Here the scheduler will be unlocked while waitpid is waiting
|
|
* and if the application has not yet run, it will now be able to
|
|
* do so.
|
|
*/
|
|
|
|
ret = waitpid(pid, &rc, 0);
|
|
if (ret < 0)
|
|
{
|
|
/* If the child thread does not exist, waitpid() will return
|
|
* the error ECHLD. Since we know that the task was successfully
|
|
* started, this must be one of the cases described above; we
|
|
* have to assume that the task already exit'ed. In this case,
|
|
* we have no idea if the application ran successfully or not
|
|
* (because NuttX does not retain exit status of child tasks).
|
|
* Let's assume that is did run successfully.
|
|
*/
|
|
|
|
int errcode = errno;
|
|
if (errcode == ECHILD)
|
|
{
|
|
ret = OK;
|
|
}
|
|
else
|
|
{
|
|
nsh_output(vtbl, g_fmtcmdfailed, cmd, "waitpid",
|
|
NSH_ERRNO_OF(errcode));
|
|
}
|
|
}
|
|
|
|
/* Waitpid completed the wait successfully */
|
|
|
|
else
|
|
{
|
|
/* 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, ¶m);
|
|
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();
|
|
|
|
/* Free attibutes and file actions. Ignoring return values in the case
|
|
* of an error.
|
|
*/
|
|
|
|
errout_with_actions:
|
|
(void)posix_spawn_file_actions_destroy(&file_actions);
|
|
|
|
errout_with_attrs:
|
|
(void)posix_spawnattr_destroy(&attr);
|
|
|
|
errout:
|
|
/* Most posix_spawn interfaces return a positive errno value on failure
|
|
* and do not set the errno variable.
|
|
*/
|
|
|
|
if (ret > 0)
|
|
{
|
|
/* Set the errno value and return -1 */
|
|
|
|
set_errno(ret);
|
|
ret = ERROR;
|
|
}
|
|
else if (ret < 0)
|
|
{
|
|
/* Return -1 on failure. errno should have been set. */
|
|
|
|
ret = ERROR;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_NSH_FILE_APPS */
|