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/*
* Copyright © 2013 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Thomas Voß <thomas.voss@canonical.com>
*/
#ifndef CROSS_PROCESS_SYNC_H_
#define CROSS_PROCESS_SYNC_H_
#include <cstring>
#include <stdexcept>
#include <unistd.h>
namespace test
{
struct CrossProcessSync
{
static const int read_fd = 0;
static const int write_fd = 1;
CrossProcessSync()
{
if (pipe(fds) < 0)
throw std::runtime_error(strerror(errno));
}
~CrossProcessSync() noexcept
{
::close(fds[0]);
::close(fds[1]);
}
void signal_ready()
{
int value = 42;
if (!write(fds[write_fd], std::addressof(value), sizeof(value)))
throw std::runtime_error(::strerror(errno));
}
void wait_for_signal_ready() const
{
int value;
if (!read(fds[read_fd], std::addressof(value), sizeof(value)))
throw std::runtime_error(::strerror(errno));
}
int fds[2];
};
}
#endif // CROSS_PROCESS_SYNC_H_
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