// Automated Testing Framework (atf)

//
// Automated Testing Framework (atf)
//
// Copyright (c) 2010 The NetBSD Foundation, Inc.
// All rights reserved.
//
// 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.
//
// THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
//

extern "C" {
#include <sys/time.h>
}

#include <cassert>
#include <cerrno>
#include <csignal>
#include <ctime>

#include "exceptions.hpp"
#include "signals.hpp"
#include "timers.hpp"

namespace impl = tools::timers;
#define IMPL_NAME "tools::timers"

// ------------------------------------------------------------------------
// Auxiliary functions.
// ------------------------------------------------------------------------

static
void
handler(const int signo __attribute__((__unused__)), siginfo_t* si,
void* uc __attribute__((__unused__)))
{
impl::timer* timer = static_cast< impl::timer* >(si->si_value.sival_ptr);
timer->set_fired();
timer->timeout_callback();
}

// ------------------------------------------------------------------------
// The "timer" class.
// ------------------------------------------------------------------------

struct impl::timer::impl {
::timer_t m_timer;
::itimerspec m_old_it;

struct ::sigaction m_old_sa;
volatile bool m_fired;

impl(void) : m_fired(false)
{
}
};

impl::timer::timer(const unsigned int seconds) :
m_pimpl(new impl())
{
struct ::sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_SIGINFO;
sa.sa_sigaction = ::handler;
if (::sigaction(SIGALRM, &sa, &m_pimpl->m_old_sa) == -1)
throw tools::system_error(IMPL_NAME "::timer::timer",
"Failed to set signal handler", errno);

struct ::sigevent se;
se.sigev_notify = SIGEV_SIGNAL;
se.sigev_signo = SIGALRM;
se.sigev_value.sival_ptr = static_cast< void* >(this);
se.sigev_notify_function = NULL;
se.sigev_notify_attributes = NULL;
if (::timer_create(CLOCK_MONOTONIC, &se, &m_pimpl->m_timer) == -1) {
::sigaction(SIGALRM, &m_pimpl->m_old_sa, NULL);
throw tools::system_error(IMPL_NAME "::timer::timer",
"Failed to create timer", errno);
}

struct ::itimerspec it;
it.it_interval.tv_sec = 0;
it.it_interval.tv_nsec = 0;
it.it_value.tv_sec = seconds;
it.it_value.tv_nsec = 0;
if (::timer_settime(m_pimpl->m_timer, 0, &it, &m_pimpl->m_old_it) == -1) {
::sigaction(SIGALRM, &m_pimpl->m_old_sa, NULL);
::timer_delete(m_pimpl->m_timer);
throw tools::system_error(IMPL_NAME "::timer::timer",
"Failed to program timer", errno);
}
}

impl::timer::~timer(void)
{
int ret;

ret = ::timer_delete(m_pimpl->m_timer);
assert(ret != -1);

ret = ::sigaction(SIGALRM, &m_pimpl->m_old_sa, NULL);
assert(ret != -1);
}

bool
impl::timer::fired(void)
const
{
return m_pimpl->m_fired;
}

void
impl::timer::set_fired(void)
{
m_pimpl->m_fired = true;
}

// ------------------------------------------------------------------------
// The "child_timer" class.
// ------------------------------------------------------------------------

impl::child_timer::child_timer(const unsigned int seconds, const pid_t pid,
volatile bool& terminate) :
timer(seconds),
m_pid(pid),
m_terminate(terminate)
{
}

impl::child_timer::~child_timer(void)
{
}

void
impl::child_timer::timeout_callback(void)
{
static const timespec ts = { 1, 0 };
m_terminate = true;
::kill(-m_pid, SIGTERM);
::nanosleep(&ts, NULL);
if (::kill(-m_pid, 0) != -1)
::kill(-m_pid, SIGKILL);
}