SignalEvent.cc

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
#include "pedigree/kernel/process/Event.h"
#include "pedigree/kernel/process/SignalEvent.h"
#include "pedigree/kernel/process/Thread.h"
#include "pedigree/kernel/processor/Processor.h"
#include "pedigree/kernel/processor/ProcessorInformation.h"
#include "pedigree/kernel/processor/types.h"
 
SignalEvent::SignalEvent(uintptr_t handlerAddress, size_t signalNum, size_t specificNestingLevel,
                         uint64_t signalMask, bool deferSignal, bool isDeletable,
                         HandlerPrivilege handlerPrivilege, DeliveryDisposition disposition,
                         bool useAlternateUserStack, size_t continuationEpoch)
    : Event(handlerAddress, isDeletable, specificNestingLevel, handlerPrivilege),
      m_SignalNumber(signalNum),
      m_SignalMask(signalMask),
      m_DeferSignal(deferSignal),
      m_ProcessDirected(false),
      m_Disposition(disposition),
      m_UseAlternateUserStack(useAlternateUserStack),
      m_ContinuationEpoch(continuationEpoch),
      m_SignalCode(0),
      m_SenderProcess(0),
      m_SenderUser(0),
      m_SignalValue(0) {}
 
SignalEvent::SignalEvent(const SignalEvent& other) : SignalEvent(other, other.m_bIsDeletable) {}
 
SignalEvent::SignalEvent(const SignalEvent& other, bool isDeletable)
    : Event(other.m_HandlerAddress, isDeletable, other.m_NestingLevel, other.m_HandlerPrivilege),
      m_SignalNumber(other.m_SignalNumber),
      m_SignalMask(other.m_SignalMask),
      m_DeferSignal(other.m_DeferSignal),
      m_ProcessDirected(other.m_ProcessDirected),
      m_Disposition(other.m_Disposition),
      m_UseAlternateUserStack(other.m_UseAlternateUserStack),
      m_ContinuationEpoch(other.m_ContinuationEpoch),
      m_SignalCode(other.m_SignalCode),
      m_SenderProcess(other.m_SenderProcess),
      m_SenderUser(other.m_SenderUser),
      m_SignalValue(other.m_SignalValue),
      m_TraceBypass(other.m_TraceBypass),
      m_ChildStatus(other.m_ChildStatus),
      m_ChildUserTime(other.m_ChildUserTime),
      m_ChildSystemTime(other.m_ChildSystemTime) {}
 
SignalEvent::~SignalEvent() {
  if (m_DeliveryState) {
    m_DeliveryState->complete(false, 0);
  }
}
 
Event* SignalEvent::cloneForDelivery() {
  if (isDeletable()) {
    return this;
  }
 
  return new SignalEvent(*this, true);
}
 
SignalEvent* SignalEvent::cloneForDisposition() {
  return new SignalEvent(*this, false);
}
 
size_t SignalEvent::serialize(uint8_t* pBuffer) {
  int32_t timerId = 0, overrun = 0;
  timerInfo(timerId, overrun);
  completeSignalDelivery(overrun);
  Thread* pThread = Processor::information().getCurrentThread();
  if (pThread) {
    pThread->setCurrentSignalDelivery(m_SignalNumber, m_ContinuationEpoch);
    if (m_Disposition == DeliveryDisposition::CaughtHandler) {
      pThread->markSignalInterruptedWait();
    }
 
    constexpr uint64_t UnblockableSignals =
        (static_cast<uint64_t>(1) << (9 - 1)) | (static_cast<uint64_t>(1) << (19 - 1));
    uint64_t mask = pThread->getSignalMask() | m_SignalMask;
    if (m_DeferSignal && m_SignalNumber > 0 && m_SignalNumber <= 64) {
      mask |= static_cast<uint64_t>(1) << (m_SignalNumber - 1);
    }
    mask &= ~UnblockableSignals;
    pThread->setSignalMask(mask);
  }
 
  pBuffer[0] = static_cast<uint8_t>(m_SignalNumber & 0xFF);
  return 1;
}
 
bool SignalEvent::unserialize(uint8_t* pBuffer, Event& event) {
  pBuffer[0] = static_cast<uint8_t>(event.getNumber() & 0xFF);
  return true;
}