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- /****************************************************************************
- * sched/task/task_start.c
- *
- * Copyright (C) 2007-2010, 2013, 2018 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>
- #include <stdlib.h>
- #include <sched.h>
- #include <debug.h>
- #include <string.h>
- #include <nuttx/arch.h>
- #include <nuttx/sched.h>
- #include "group/group.h"
- #include "sched/sched.h"
- #include "signal/signal.h"
- #include "task/task.h"
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- /* This is an artificial limit to detect error conditions where an argv[]
- * list is not properly terminated.
- */
- #define MAX_START_ARGS 256
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nxtask_start
- *
- * Description:
- * This function is the low level entry point into the main thread of
- * execution of a task. It receives initial control when the task is
- * started and calls main entry point of the newly started task.
- *
- * Input Parameters:
- * None
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- void nxtask_start(void)
- {
- FAR struct task_tcb_s *tcb = (FAR struct task_tcb_s *)this_task();
- int exitcode;
- int argc;
- DEBUGASSERT((tcb->cmn.flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_PTHREAD);
- #ifdef CONFIG_SIG_DEFAULT
- /* Set up default signal actions */
- nxsig_default_initialize(&tcb->cmn);
- #endif
- /* Execute the start hook if one has been registered */
- #ifdef CONFIG_SCHED_STARTHOOK
- if (tcb->starthook != NULL)
- {
- tcb->starthook(tcb->starthookarg);
- }
- #endif
- /* Count how many non-null arguments we are passing. The first non-null
- * argument terminates the list .
- */
- argc = 1;
- while (tcb->argv[argc])
- {
- /* Increment the number of args. Here is a sanity check to
- * prevent running away with an unterminated argv[] list.
- * MAX_START_ARGS should be sufficiently large that this never
- * happens in normal usage.
- */
- if (++argc > MAX_START_ARGS)
- {
- exit(EXIT_FAILURE);
- }
- }
- /* Call the 'main' entry point passing argc and argv. In the kernel build
- * this has to be handled differently if we are starting a user-space task;
- * we have to switch to user-mode before calling the task.
- */
- #if defined(CONFIG_BUILD_PROTECTED) || defined(CONFIG_BUILD_KERNEL)
- if ((tcb->cmn.flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_KERNEL)
- {
- up_task_start(tcb->cmn.entry.main, argc, tcb->argv);
- exitcode = EXIT_FAILURE; /* Should not get here */
- }
- else
- #endif
- {
- exitcode = tcb->cmn.entry.main(argc, tcb->argv);
- }
- /* Call exit() if/when the task returns */
- exit(exitcode);
- }
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