264 lines
9.2 KiB
C
264 lines
9.2 KiB
C
/****************************************************************************
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* apps/nshlib/nsh_builtin.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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/ioctl.h>
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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 <sched.h>
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#include <signal.h>
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#include <string.h>
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#include <nuttx/lib/builtin.h>
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#include "builtin/builtin.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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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nsh_builtin
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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_builtin() 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_builtin(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd,
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FAR char **argv, FAR const char *redirfile_in,
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FAR const char *redirfile_out, int oflags)
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{
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#if !defined(CONFIG_NSH_DISABLEBG) && defined(CONFIG_SCHED_CHILD_STATUS)
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struct sigaction act;
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struct sigaction old;
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#endif
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int ret = OK;
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/* Lock the scheduler in an attempt to prevent the application from
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* running until waitpid() has been called.
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*/
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sched_lock();
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#if !defined(CONFIG_NSH_DISABLEBG) && defined(CONFIG_SCHED_CHILD_STATUS)
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/* Ignore the child status if run the application on background. */
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if (vtbl->np.np_bg == true)
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{
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act.sa_handler = SIG_DFL;
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act.sa_flags = SA_NOCLDWAIT;
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sigemptyset(&act.sa_mask);
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sigaction(SIGCHLD, &act, &old);
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}
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#endif /* CONFIG_NSH_DISABLEBG */
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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_builtin(cmd, argv, redirfile_in, redirfile_out, oflags);
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if (ret >= 0)
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{
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/* The application was successfully started with pre-emption disabled.
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* In the simplest cases, the application will not have run because the
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* the scheduler is locked. But in the case where I/O was redirected,
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* a proxy task ran and broke our lock. As result, the application may
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* have aso ran if its priority was higher than than the priority of
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* this thread.
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*
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* If the application did not run to completion and if the application
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* was not backgrounded, then we need to wait here for the application
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* to exit. This only works works with the following options:
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*
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* - CONFIG_NSH_DISABLEBG - Do not run commands in background
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* - CONFIG_SCHED_WAITPID - Required to run external commands in
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* foreground
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*/
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#ifdef CONFIG_SCHED_WAITPID
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/* CONFIG_SCHED_WAITPID is selected, so we may run the command in
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* foreground unless we were specifically requested to run the command
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* in background (and running commands in background is enabled).
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*/
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# ifndef CONFIG_NSH_DISABLEBG
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if (vtbl->np.np_bg == false)
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# endif /* CONFIG_NSH_DISABLEBG */
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{
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int rc = 0;
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int tc = 0;
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if (vtbl->isctty)
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{
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/* Setup up to receive SIGINT if control-C entered. */
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tc = nsh_ioctl(vtbl, TIOCSCTTY, ret);
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}
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/* Wait for the application to exit. We did lock the scheduler
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* above, but that does not guarantee that the application did not
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* already run to completion in the case where I/O was redirected.
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* Here the scheduler will be unlocked while waitpid is waiting
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* and if the application has not yet run, it will now be able to
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* do so.
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*
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* Also, if CONFIG_SCHED_HAVE_PARENT is defined waitpid() might
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* fail even if task is still active: If the I/O was re-directed
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* by a proxy task, then the ask is a child of the proxy, and not
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* this task. waitpid() fails with ECHILD in either case.
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*
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* NOTE: WUNTRACED does nothing in the default case, but in the
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* case the where CONFIG_SIG_SIGSTOP_ACTION=y, the built-in app
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* may also be stopped. In that case WUNTRACED will force
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* waitpid() to return with ECHILD.
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*/
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ret = waitpid(ret, &rc, WUNTRACED);
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if (ret < 0)
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{
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/* If the child thread does not exist, waitpid() will return
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* the error ECHLD. Since we know that the task was
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* successfully started, this must be one of the cases
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* described above; we have to assume that the task already
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* exit'ed. In this case, we have no idea if the application
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* ran successfully or not (because NuttX does not retain exit
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* status of child tasks). Let's assume that is did run
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* successfully.
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*/
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int errcode = errno;
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if (errcode == ECHILD)
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{
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ret = OK;
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}
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else
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{
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nsh_error(vtbl, g_fmtcmdfailed, cmd, "waitpid",
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NSH_ERRNO_OF(errcode));
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}
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}
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/* Waitpid completed the wait successfully */
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else
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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
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* look 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
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* corresponding to WEXITSTATUS(rc) so that $? will expand to
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* the exit status of the most recently executed task.
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*/
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}
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if (vtbl->isctty && tc == 0)
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{
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nsh_ioctl(vtbl, TIOCNOTTY, 0);
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}
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}
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# ifndef CONFIG_NSH_DISABLEBG
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else
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# endif /* CONFIG_NSH_DISABLEBG */
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#endif /* CONFIG_SCHED_WAITPID */
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/* We get here if either:
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*
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* - CONFIG_SCHED_WAITPID is not selected meaning that all commands
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* have to be run in background, or
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* - CONFIG_SCHED_WAITPID and CONFIG_NSH_DISABLEBG are both selected,
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* but the user requested to run the command in background.
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*
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* NOTE that the case of a) CONFIG_SCHED_WAITPID is not selected and
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* b) CONFIG_NSH_DISABLEBG selected cannot be supported. In that
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* event, all commands will have to run in background. The waitpid()
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* API must be available to support running the command in foreground.
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*/
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#if !defined(CONFIG_SCHED_WAITPID) || !defined(CONFIG_NSH_DISABLEBG)
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{
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#if !defined(CONFIG_NSH_DISABLEBG) && defined(CONFIG_SCHED_CHILD_STATUS)
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/* Restore the old actions */
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sigaction(SIGCHLD, &old, NULL);
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# endif
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struct sched_param param;
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sched_getparam(ret, ¶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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#endif /* !CONFIG_SCHED_WAITPID || !CONFIG_NSH_DISABLEBG */
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}
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sched_unlock();
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/* If exec_builtin() or waitpid() failed, then return -1 (ERROR) with the
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* errno value set appropriately.
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*/
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if (ret < 0)
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{
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return ERROR;
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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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