diff options
Diffstat (limited to 'nuttx/sched/sig_received.c')
| -rw-r--r-- | nuttx/sched/sig_received.c | 404 |
1 files changed, 0 insertions, 404 deletions
diff --git a/nuttx/sched/sig_received.c b/nuttx/sched/sig_received.c deleted file mode 100644 index cf4d00165..000000000 --- a/nuttx/sched/sig_received.c +++ /dev/null @@ -1,404 +0,0 @@ -/************************************************************************ - * sched/sig_received.c - * - * Copyright (C) 2007, 2009, 2011 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 <string.h> -#include <signal.h> -#include <unistd.h> -#include <sched.h> -#include <errno.h> -#include <debug.h> - -#include <nuttx/arch.h> - -#include "os_internal.h" -#include "sem_internal.h" -#include "sig_internal.h" -#include "mq_internal.h" - -/************************************************************************ - * Definitions - ************************************************************************/ - -/************************************************************************ - * Private Type Declarations - ************************************************************************/ - -/************************************************************************ - * Global Variables - ************************************************************************/ - -/************************************************************************ - * Private Variables - ************************************************************************/ - -/************************************************************************ - * Private Functions - ************************************************************************/ - -/************************************************************************ - * Name: sig_queueaction - * - * Description: - * Queue a signal action for delivery to a task. - * - ************************************************************************/ - -static int sig_queueaction(FAR _TCB *stcb, siginfo_t *info) -{ - FAR sigactq_t *sigact; - FAR sigq_t *sigq; - irqstate_t saved_state; - int ret = OK; - - sched_lock(); - - /* Find the sigaction associated with this signal */ - - sigact = sig_findaction(stcb, info->si_signo); - - /* Check if a valid signal handler is available and if the signal is - * unblocked. NOTE: There is no default action. - */ - - if ((sigact) && (sigact->act.sa_u._sa_sigaction)) - { - /* Allocate a new element for the signal queue. NOTE: sig_allocatependingsigaction - * will force a system crash if it is unable to allocate memory for the - * signal data */ - - sigq = sig_allocatependingsigaction(); - if (!sigq) ret = ERROR; - else - { - /* Populate the new signal queue element */ - - sigq->action.sighandler = sigact->act.sa_u._sa_sigaction; - sigq->mask = sigact->act.sa_mask; - memcpy(&sigq->info, info, sizeof(siginfo_t)); - - /* Put it at the end of the pending signals list */ - - saved_state = irqsave(); - sq_addlast((FAR sq_entry_t*)sigq, &(stcb->sigpendactionq)); - irqrestore(saved_state); - } - } - - sched_unlock(); - return ret; -} - -/************************************************************************ - * Name: sig_findpendingsignal - * - * Description: - * Find a specified element in the pending signal list - * - ************************************************************************/ - -static FAR sigpendq_t *sig_findpendingsignal(FAR _TCB *stcb, int signo) -{ - FAR sigpendq_t *sigpend = NULL; - irqstate_t saved_state; - - /* Verify the caller's sanity */ - - if (stcb) - { - /* Pending sigals can be added from interrupt level. */ - - saved_state = irqsave(); - - /* Seach the list for a sigpendion on this signal */ - - for(sigpend = (FAR sigpendq_t*)stcb->sigpendingq.head; - (sigpend && sigpend->info.si_signo != signo); - sigpend = sigpend->flink); - irqrestore(saved_state); - } - - return sigpend; -} - -/************************************************************************ - * Name: sig_allocatependingsignal - * - * Description: - * Allocate a pending signal list entry - * - ************************************************************************/ - -static FAR sigpendq_t *sig_allocatependingsignal(void) -{ - FAR sigpendq_t *sigpend; - irqstate_t saved_state; - - /* Check if we were called from an interrupt handler. */ - - if (up_interrupt_context()) - { - /* Try to get the pending signal structure from the free list */ - - sigpend = (FAR sigpendq_t*)sq_remfirst(&g_sigpendingsignal); - if (!sigpend) - { - /* If no pending signal structure is available in the free list, - * then try the special list of structures reserved for - * interrupt handlers - */ - - sigpend = (FAR sigpendq_t*)sq_remfirst(&g_sigpendingirqsignal); - } - } - - /* If we were not called from an interrupt handler, then we are - * free to allocate pending action structures if necessary. */ - - else - { - /* Try to get the pending signal structure from the free list */ - - saved_state = irqsave(); - sigpend = (FAR sigpendq_t*)sq_remfirst(&g_sigpendingsignal); - irqrestore(saved_state); - - /* Check if we got one. */ - - if (!sigpend) - { - /* No... Allocate the pending signal */ - - if (!sigpend) - { - sigpend = (FAR sigpendq_t *)kmalloc((sizeof (sigpendq_t))); - } - - /* Check if we got an allocated message */ - - if (sigpend) - { - sigpend->type = SIG_ALLOC_DYN; - } - } - } - - return sigpend; -} - -/************************************************************************ - * Name: sig_addpendingsignal - * - * Description: - * Add the specified signal to the signal pending list. NOTE: This - * function will queue only one entry for each pending signal. This - * was done intentionally so that a run-away sender cannot consume - * all of memory. - * - ************************************************************************/ - -static FAR sigpendq_t *sig_addpendingsignal(FAR _TCB *stcb, - siginfo_t *info) -{ - FAR sigpendq_t *sigpend; - irqstate_t saved_state; - - /* Check if the signal is already pending */ - - sigpend = sig_findpendingsignal(stcb, info->si_signo); - if (sigpend) - { - /* The signal is already pending... retain only one copy */ - - memcpy(&sigpend->info, info, sizeof(siginfo_t)); - } - - /* No... There is nothing pending for this signo */ - - else - { - /* Allocate a new pending signal entry */ - - sigpend = sig_allocatependingsignal(); - if (sigpend) - { - /* Put the signal information into the allocated structure */ - - memcpy(&sigpend->info, info, sizeof(siginfo_t)); - - /* Add the structure to the pending signal list */ - - saved_state = irqsave(); - sq_addlast((FAR sq_entry_t*)sigpend, &stcb->sigpendingq); - irqrestore(saved_state); - } - } - - return sigpend; -} - -/************************************************************************ - * Public Functions - ************************************************************************/ - -/************************************************************************ - * Name: sig_received - * - * Description: - * All signals received the task (whatever the source) go through this - * function to be processed. This function is responsible for: - * - * - Determining if the signal is blocked. - * - Queuing and dispatching signal actions - * - Unblocking tasks that are waiting for signals - * - Queuing pending signals. - * - ************************************************************************/ - -int sig_received(FAR _TCB *stcb, siginfo_t *info) -{ - irqstate_t saved_state; - int ret = ERROR; - - sdbg("TCB=0x%08x signo=%d code=%d value=%d mask=%08x\n", - stcb, info->si_signo, info->si_code, - info->si_value.sival_int, stcb->sigprocmask); - - if (stcb && info) - { - ret = OK; - - /****************** MASKED SIGNAL HANDLING ******************/ - - /* Check if the signal is masked -- if it is, it will be added to the - * list of pending signals. - */ - - if (sigismember(&stcb->sigprocmask, info->si_signo)) - { - /* Check if the task is waiting for this pending signal. If so, - * then unblock it. This must be performed in a critical section - * because signals can be queued from the interrupt level. - */ - - saved_state = irqsave(); - if (stcb->task_state == TSTATE_WAIT_SIG && - sigismember(&stcb->sigwaitmask, info->si_signo)) - { - memcpy(&stcb->sigunbinfo, info, sizeof(siginfo_t)); - stcb->sigwaitmask = NULL_SIGNAL_SET; - up_unblock_task(stcb); - irqrestore(saved_state); - } - - /* Its not one we are waiting for... Add it to the list of pending - * signals. - */ - - else - { - irqrestore(saved_state); - if (!sig_addpendingsignal(stcb, info)) - { - PANIC(OSERR_FAILEDTOADDSIGNAL); - } - } - } - - /****************** UNMASKED SIGNAL HANDLING ******************/ - - else - { - /* Queue any sigaction's requested by this task. */ - - ret = sig_queueaction(stcb, info); - - /* Then schedule execution of the signal handling action on - * the recipients thread. - */ - - up_schedule_sigaction(stcb, sig_deliver); - - /* Check if the task is waiting for an unmasked signal. If so, - * then unblock it. This must be performed in a critical section - * because signals can be queued from the interrupt level. - */ - - saved_state = irqsave(); - if (stcb->task_state == TSTATE_WAIT_SIG) - { - memcpy(&stcb->sigunbinfo, info, sizeof(siginfo_t)); - stcb->sigwaitmask = NULL_SIGNAL_SET; - up_unblock_task(stcb); - } - irqrestore(saved_state); - - /* If the task neither was waiting for the signal nor had a signal - * handler attached to the signal, then the default action is - * simply to ignore the signal - */ - - /****************** OTHER SIGNAL HANDLING ******************/ - - /* If the task is blocked waiting for a semaphore, then that - * task must be unblocked when a signal is received. - */ - - if (stcb->task_state == TSTATE_WAIT_SEM) - { - sem_waitirq(stcb, EINTR); - } - - /* If the task is blocked waiting on a message queue, then that - * task must be unblocked when a signal is received. - */ - -#ifndef CONFIG_DISABLE_MQUEUE - if (stcb->task_state == TSTATE_WAIT_MQNOTEMPTY || - stcb->task_state == TSTATE_WAIT_MQNOTFULL) - { - mq_waitirq(stcb, EINTR); - } -#endif - } - } - - return ret; -} |