8198ba6a6d
This is analogous to similar renaming that was done previously for semaphores.
Squashed commit of the following:
sched/signal: Fix a few compile warnings introduced by naming changes.
sched/signal: Rename all private, internal signl functions to use the nxsig_ prefix.
sched/signal: Rename sig_removependingsignal, sig_unmaskpendingsignal, and sig_mqnotempty to nxsig_remove_pendingsignal, nxsig_unmask_pendingsignal, and nxsig_mqnotempty to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_findaction and sig_lowest to nxsig_find_action and nxsig_lowest to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_allocatepingsigaction and sig_deliver to nxsig_alloc_pendingsigaction and nxsig_deliver to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_cleanup, sig_release, sig_releasependingaction, and sig_releasependingsignal to nxsig_cleanup, nxsig_release, nxsig_release_pendingaction, and nxsig_release_pendingsignal to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_tcbdispatch and sig_dispatch to nxsig_tcbdispatch and nxsig_dispatch to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_releaseaction and sig_pendingset to nxsig_release_action and nxsig_pendingset to make it clear that these are OS internal interfaces.
sched/signal: Rename sig_initialize and sig_allocateactionblock to nxsig_initialize and nxsig_alloc_actionblock to make it clear that these are OS internal interfaces.
170 lines
6.2 KiB
C
170 lines
6.2 KiB
C
/****************************************************************************
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* sched/signal/sig_deliver.c
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*
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* Copyright (C) 2007, 2008, 2012-2013, 2016 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 <sys/types.h>
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#include <signal.h>
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#include <unistd.h>
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#include <sched.h>
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#include <string.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include "semaphore/semaphore.h"
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#include "signal/signal.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxsig_deliver
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*
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* Description:
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* This function is called on the thread of execution of the signal
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* receiving task. It processes all queued signals then returns.
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*
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****************************************************************************/
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void nxsig_deliver(FAR struct tcb_s *stcb)
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{
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FAR sigq_t *sigq;
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FAR sigq_t *next;
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sigset_t savesigprocmask;
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irqstate_t flags;
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int saved_errno;
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sched_lock();
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/* Save the thread errno. When we finished dispatching the
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* signal actions and resume the task, the errno value must
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* be unchanged by the operation of the signal handling. In
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* particular, the EINTR indication that says that the task
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* was reawakened by a signal must be retained.
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*/
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saved_errno = stcb->pterrno;
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for (sigq = (FAR sigq_t *)stcb->sigpendactionq.head; (sigq); sigq = next)
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{
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next = sigq->flink;
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sinfo("Sending signal sigq=0x%x\n", sigq);
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/* Remove the signal structure from the sigpendactionq and place it
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* in the sigpostedq. NOTE: Since signals are processed one at a
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* time, there should never be more than one signal in the sigpostedq
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*/
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flags = enter_critical_section();
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sq_rem((FAR sq_entry_t *)sigq, &(stcb->sigpendactionq));
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sq_addlast((FAR sq_entry_t *)sigq, &(stcb->sigpostedq));
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leave_critical_section(flags);
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/* Call the signal handler (unless the signal was cancelled)
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*
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* Save a copy of the old sigprocmask and install the new
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* (temporary) sigprocmask. The new sigprocmask is the union
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* of the current sigprocmask and the sa_mask for the signal being
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* delivered plus the signal being delivered.
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*/
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savesigprocmask = stcb->sigprocmask;
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stcb->sigprocmask = savesigprocmask | sigq->mask |
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SIGNO2SET(sigq->info.si_signo);
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/* Deliver the signal. In the kernel build this has to be handled
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* differently if we are dispatching to a signal handler in a user-
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* space task or thread; we have to switch to user-mode before
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* 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 ((stcb->flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_KERNEL)
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{
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/* The sigq_t pointed to by sigq resides in kernel space. So we
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* cannot pass a reference to sigq->info to the user application.
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* Instead, we will copy the siginfo_t structure onto the stack.
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* We are currently executing on the stack of the user thread
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* (albeit temporarily in kernel mode), so the copy of the
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* siginfo_t structure will be accessible by the user thread.
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*/
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siginfo_t info;
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memcpy(&info, &sigq->info, sizeof(siginfo_t));
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up_signal_dispatch(sigq->action.sighandler, sigq->info.si_signo,
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&info, NULL);
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}
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else
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#endif
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{
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/* The kernel thread signal handler is much simpler. */
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(*sigq->action.sighandler)(sigq->info.si_signo, &sigq->info,
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NULL);
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}
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/* Restore the original sigprocmask */
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stcb->sigprocmask = savesigprocmask;
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/* Now, handle the (rare?) case where (a) a blocked signal was
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* received while the signal handling executed but (b) restoring the
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* original sigprocmask will unblock the signal.
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*/
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nxsig_unmask_pendingsignal();
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/* Remove the signal from the sigpostedq */
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flags = enter_critical_section();
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sq_rem((FAR sq_entry_t *)sigq, &(stcb->sigpostedq));
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leave_critical_section(flags);
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/* Then deallocate it */
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nxsig_release_pendingsigaction(sigq);
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}
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stcb->pterrno = saved_errno;
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sched_unlock();
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}
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