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.
301 lines
9.0 KiB
C
301 lines
9.0 KiB
C
/****************************************************************************
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* sched/signal/sig_default.c
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*
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* Copyright (C) 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 <string.h>
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#include <signal.h>
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#include <assert.h>
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#include <nuttx/sched.h>
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#include "signal/signal.h"
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* This table is used to make the default action for a signal to the correct
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* signal handler.
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*/
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#if 0 /* Not used */
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static const struct _sa_sigaction_t g_defactions[MAX_SIGNO + 1] =
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{
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/* To be provided */
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}
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/* TODO: Take into account pthread-specific signal behaviors */
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/* Default Actions:
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*
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* - Abnormal termination of the process. The process is terminated with
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* all the consequences of _exit() except that the status made available
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* to wait() and waitpid() indicates abnormal termination by the
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* specified signal.
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* - Abnormal termination of the process. Additionally with the XSI
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* extension, implementation-defined abnormal termination actions, such
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* as creation of a core file, may occur.
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* - Ignore the signal.
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* - Stop the process.
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* - Continue the process, if it is stopped; otherwise, ignore the signal.
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*/
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/****************************************************************************
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* Name: nxsig_abnormal_termination
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*
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* Description:
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* This is the abnormal termination default action for the SIGKILL signal.
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*
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* Input Parameters:
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* Standard signal handler parameters
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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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static void nxsig_abnormal_termination(int signo, FAR siginfo_t *siginfo,
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FAR void *arg)
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{
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#ifdef HAVE_GROUP_MEMBERS
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FAR struct tcb_s *tcb = (FAR struct tcb_s *)this_task();
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/* Kill of of the children of the task */
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group_killchildren(tcb);
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#endif
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/* And exit to terminate the task */
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exit(EXIT_FAILURE);
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}
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/****************************************************************************
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* Name: nxsig_setup_default_action
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*
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* Description:
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* Setup the default action for the SIGKILL signal
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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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static void nxsig_setup_default_action(FAR struct tcb_s *tcb,
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_sa_sigaction_t action, int signo)
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{
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FAR struct task_group_s *group;
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struct sigaction sa;
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DEBUGASSERT(tcb != NULL && tcb->group != NULL && GOOD_SIGNO(signo));
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group = tcb->group;
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/* Attach the signal handler */
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memset(&sa, 0, sizeof(sa));
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sa.sa_sigaction = action;
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sa.sa_flags = SA_SIGINFO;
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(void)sigaction(SIGKILL, &sa, NULL);
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/* Indicate that the default signal handler has been attached */
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(void)sigaddset(&group->tg_sigdefault, signo);
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}
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/****************************************************************************
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* Name: nxsig_setup_default_action
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*
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* Description:
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* Setup the default action for the SIGKILL signal
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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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static void nxsig_unsetup_default_action(FAR struct tcb_s *tcb, int signo)
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{
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FAR struct task_group_s *group;
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DEBUGASSERT(tcb != NULL && tcb->group != NULL && GOOD_SIGNO(signo));
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group = tcb->group;
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/* Indicate that the default signal handler has been replaced */
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(void)sigdelset(&group->tg_sigdefault, signo);
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}
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/****************************************************************************
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* Name: nxsig_default_action
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*
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* Description:
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* Look up the default action associated with this signal
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*
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* Input Parameters:
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* signo - The signal number to use in the query
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*
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* Returned Value:
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* The default handler associated with this signal
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*
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****************************************************************************/
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static _sa_sigaction_t nxsig_default_action(int signo)
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{
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#if 0 /* Not implemented */
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return g_defactions[signo];
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#else
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/* Currently only SIGKILL and the abnormal exit signal action are supported */
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return signo == SIGKILL ? nxsig_abnormal_termination : NULL;
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#endif
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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: nxsig_isdefault
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*
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* Description:
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* Return true if the specified signal is set to the default action.
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*
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* Input Parameters:
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* tcb - Identifies the thread associated with the default handler
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* signo - The signal number to be queried
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*
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* Returned Value:
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* Zero (OK) is returned on success; A negated errno value is returned
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* on failure.
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*
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****************************************************************************/
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bool nxsig_isdefault(FAR struct tcb_s *tcb, int signo)
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{
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FAR struct task_group_s *group;
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int ret;
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DEBUGASSERT(tcb != NULL && tcb->group != NULL && GOOD_SIGNO(signo));
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group = tcb->group;
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/* Return true if the signo is marked as using the default action. Return
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* false in all other cases.
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*/
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ret = sigismember(&group->tg_sigdefault, signo);
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return ret < 0 ? false : (bool)ret;
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}
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/****************************************************************************
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* Name: nxsig_setdefault
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*
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* Description:
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* Set the default action for the specified signal
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*
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* Input Parameters:
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* tcb - Identifies the thread associated with the default handler
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* signo - The signal number whose behavior will be modified.
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* defaction - True: the default action is in place
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*
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* Returned Value:
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* Zero (OK) is returned on success; A negated errno value is returned
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* on failure.
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*
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****************************************************************************/
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int nxsig_default(FAR struct tcb_s *tcb, int signo, bool defaction)
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{
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/* Are we setting or unsetting the default action? */
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if (defaction)
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{
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/* We are setting the default action. Look up the default action
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* associated with signo.
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*/
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_sa_sigaction_t handler = nxsig_default_action(signo);
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if (handler != NULL)
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{
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nxsig_setup_default_action(tcb, handler, signo);
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}
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}
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else
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{
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/* We are unsetting the default action */
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nxsig_unsetup_default_action(tcb, SIGKILL);
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}
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return OK;
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}
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/****************************************************************************
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* Name: nxsig_default_initialize
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*
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* Description:
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* Set all signals to their default action.
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*
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* Input Parameters:
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* tcb - Identifies the thread associated with the default handlers
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*
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* Returned Value:
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* Zero (OK) is returned on success; A negated errno value is returned
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* on failure.
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*
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****************************************************************************/
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int nxsig_default_initialize(FAR struct tcb_s *tcb)
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{
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/* Currently only SIGKILL is supported */
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return nxsig_default(tcb, SIGKILL, true);
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}
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