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/*
* Copyright (c) 2016, Ford Motor Company
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of the Ford Motor Company 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 HOLDER 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.
*/
#include <sys/wait.h>
#include <csignal>
#include <cstdlib>
#include <stdint.h>
#include <iostream>
#include "utils/signals.h"
namespace utils {
bool Signals::UnsubscribeFromTermination() {
// Disable some system signals receiving in thread
// by blocking those signals
// (system signals processes only in the main thread)
// Mustn't block all signals!
// See "Advanced Programming in the UNIX Environment, 3rd Edition"
// (http://poincare.matf.bg.ac.rs/~ivana//courses/ps/sistemi_knjige/pomocno/apue.pdf,
// "12.8. Threads and Signals".
sigset_t signal_set;
sigemptyset(&signal_set);
sigaddset(&signal_set, SIGINT);
sigaddset(&signal_set, SIGTERM);
return !pthread_sigmask(SIG_BLOCK, &signal_set, NULL);
}
bool Signals::UnsubscribeFromLowVoltageSignals(
const main_namespace::LowVoltageSignalsOffset& offset_data) {
// Disable Low Voltage signals in main thread
// due to all further threads will inherit signals mask
sigset_t signal_set;
sigemptyset(&signal_set);
const int SIGLOWVOLTAGE = SIGRTMIN + offset_data.low_voltage_signal_offset;
const int SIGWAKEUP = SIGRTMIN + offset_data.wake_up_signal_offset;
const int SIGIGNOFF = SIGRTMIN + offset_data.ignition_off_signal_offset;
sigaddset(&signal_set, SIGLOWVOLTAGE);
sigaddset(&signal_set, SIGWAKEUP);
sigaddset(&signal_set, SIGIGNOFF);
// Set signals mask to be blocked by thread
return !pthread_sigmask(SIG_BLOCK, &signal_set, nullptr);
}
void Signals::SendSignal(const int signo, const pid_t pid) {
if (kill(pid, signo) == -1) {
std::cerr << "Error sending signal: " << strsignal(signo) << " to " << pid
<< " .Error: " << strerror(errno) << std::endl;
}
}
pid_t Signals::Fork() {
return fork();
}
void Signals::ExitProcess(const int status) {
exit(status);
}
void Signals::WaitPid(pid_t cpid, int* status, int options) {
waitpid(cpid, status, options);
}
namespace {
bool CatchSIGSEGV(sighandler_t handler) {
struct sigaction act;
act.sa_handler = handler;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
return !sigaction(SIGSEGV, &act, NULL);
}
} // namespace
bool Signals::WaitTerminationSignals(sighandler_t sig_handler) {
sigset_t signal_set;
int sig = -1;
sigemptyset(&signal_set);
sigaddset(&signal_set, SIGINT);
sigaddset(&signal_set, SIGTERM);
if (!CatchSIGSEGV(sig_handler)) {
return false;
}
if (!sigwait(&signal_set, &sig)) {
sig_handler(sig);
return true;
}
return false;
}
} // namespace utils
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