c0d234a474
drivers/serial/Kconfig: It is no longer necessary to restrict Ctrl-C handling to the FLAT build
sched/signal: Add a new configuration option to select signal default actions, separate handling of signal default actions from both task startup logic and from the serial TTY Ctrl-C logic. Add a signal set in the group structure to keep track of what signals have been set to the default action. In dispatching signals in PROTECTED or KERNEL mode, use this signal set to determine if the default signal handler is attached and dispatch the signal in kernel mode for the default actions.
152 lines
4.9 KiB
C
152 lines
4.9 KiB
C
/****************************************************************************
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* sched/task/task_start.c
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*
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* Copyright (C) 2007-2010, 2013, 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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#include <stdlib.h>
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#include <sched.h>
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#include <debug.h>
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#include <string.h>
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#include <nuttx/arch.h>
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#include <nuttx/sched.h>
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#include "group/group.h"
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#include "sched/sched.h"
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#include "signal/signal.h"
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#include "task/task.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* This is an artificial limit to detect error conditions where an argv[]
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* list is not properly terminated.
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*/
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#define MAX_START_ARGS 256
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: task_start
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*
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* Description:
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* This function is the low level entry point into the main thread of
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* execution of a task. It receives initial control when the task is
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* started and calls main entry point of the newly started task.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void task_start(void)
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{
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FAR struct task_tcb_s *tcb = (FAR struct task_tcb_s *)this_task();
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int exitcode;
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int argc;
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DEBUGASSERT((tcb->cmn.flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_PTHREAD);
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#ifdef CONFIG_SIG_DEFAULT
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/* Set up default signal actions */
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nxsig_default_initialize(&tcb->cmn);
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#endif
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/* Execute the start hook if one has been registered */
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#ifdef CONFIG_SCHED_STARTHOOK
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if (tcb->starthook != NULL)
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{
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tcb->starthook(tcb->starthookarg);
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}
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#endif
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/* Count how many non-null arguments we are passing. The first non-null
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* argument terminates the list .
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*/
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argc = 1;
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while (tcb->argv[argc])
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{
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/* Increment the number of args. Here is a sanity check to
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* prevent running away with an unterminated argv[] list.
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* MAX_START_ARGS should be sufficiently large that this never
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* happens in normal usage.
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*/
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if (++argc > MAX_START_ARGS)
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{
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exit(EXIT_FAILURE);
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}
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}
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/* Call the 'main' entry point passing argc and argv. In the kernel build
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* this has to be handled differently if we are starting a user-space task;
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* we have to switch to user-mode before calling the task.
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*/
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#if defined(CONFIG_BUILD_PROTECTED) || defined(CONFIG_BUILD_KERNEL)
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if ((tcb->cmn.flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_KERNEL)
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{
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up_task_start(tcb->cmn.entry.main, argc, tcb->argv);
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exitcode = EXIT_FAILURE; /* Should not get here */
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}
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else
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#endif
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{
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exitcode = tcb->cmn.entry.main(argc, tcb->argv);
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}
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/* Call exit() if/when the task returns */
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exit(exitcode);
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}
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