263 lines
9.1 KiB
C
263 lines
9.1 KiB
C
/****************************************************************************
|
|
* apps/nshlib/nsh_builtin.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#ifdef CONFIG_SCHED_WAITPID
|
|
# include <sys/ioctl.h>
|
|
# include <sys/wait.h>
|
|
#endif
|
|
|
|
#include <stdbool.h>
|
|
#include <errno.h>
|
|
#include <sched.h>
|
|
#include <signal.h>
|
|
#include <string.h>
|
|
|
|
#include <nuttx/lib/builtin.h>
|
|
#include "builtin/builtin.h"
|
|
|
|
#include "nsh.h"
|
|
#include "nsh_console.h"
|
|
|
|
#ifdef CONFIG_NSH_BUILTIN_APPS
|
|
|
|
/****************************************************************************
|
|
* 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)
|
|
{
|
|
#if !defined(CONFIG_NSH_DISABLEBG) && defined(CONFIG_SCHED_CHILD_STATUS)
|
|
struct sigaction act;
|
|
struct sigaction old;
|
|
#endif
|
|
int ret = OK;
|
|
|
|
/* Lock the scheduler in an attempt to prevent the application from
|
|
* running until waitpid() has been called.
|
|
*/
|
|
|
|
sched_lock();
|
|
|
|
#if !defined(CONFIG_NSH_DISABLEBG) && defined(CONFIG_SCHED_CHILD_STATUS)
|
|
/* Ignore the child status if run the application on background. */
|
|
|
|
if (vtbl->np.np_bg == true)
|
|
{
|
|
act.sa_handler = SIG_DFL;
|
|
act.sa_flags = SA_NOCLDWAIT;
|
|
sigemptyset(&act.sa_mask);
|
|
|
|
sigaction(SIGCHLD, &act, &old);
|
|
}
|
|
|
|
#endif /* CONFIG_NSH_DISABLEBG */
|
|
|
|
/* Try to find and execute the command within the list of builtin
|
|
* applications.
|
|
*/
|
|
|
|
ret = exec_builtin(cmd, 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 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;
|
|
int tc = 0;
|
|
|
|
if (vtbl->isctty)
|
|
{
|
|
/* Setup up to receive SIGINT if control-C entered. */
|
|
|
|
tc = nsh_ioctl(vtbl, TIOCSCTTY, ret);
|
|
}
|
|
|
|
/* 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.
|
|
*
|
|
* Also, if CONFIG_SCHED_HAVE_PARENT is defined waitpid() might
|
|
* fail even if task is still active: If the I/O was re-directed
|
|
* by a proxy task, then the ask is a child of the proxy, and not
|
|
* this task. waitpid() fails with ECHILD in either case.
|
|
*
|
|
* NOTE: WUNTRACED does nothing in the default case, but in the
|
|
* case the where CONFIG_SIG_SIGSTOP_ACTION=y, the built-in app
|
|
* may also be stopped. In that case WUNTRACED will force
|
|
* waitpid() to return with ECHILD.
|
|
*/
|
|
|
|
ret = waitpid(ret, &rc, WUNTRACED);
|
|
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_error(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.
|
|
*/
|
|
}
|
|
|
|
if (vtbl->isctty && tc == 0)
|
|
{
|
|
nsh_ioctl(vtbl, TIOCNOTTY, 0);
|
|
}
|
|
}
|
|
# 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)
|
|
{
|
|
#if !defined(CONFIG_NSH_DISABLEBG) && defined(CONFIG_SCHED_CHILD_STATUS)
|
|
|
|
/* Restore the old actions */
|
|
|
|
sigaction(SIGCHLD, &old, NULL);
|
|
# endif
|
|
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();
|
|
|
|
/* 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 */
|