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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 CORE_POSIX_SIGNAL_H_
#define CORE_POSIX_SIGNAL_H_
#include <core/posix/visibility.h>
#include <core/signal.h>
#include <signal.h>
#include <initializer_list>
#include <memory>
namespace core
{
namespace posix
{
/**
* @brief The Signal enum collects the most common POSIX signals.
*/
enum class Signal
{
unknown = 0,
sig_hup = SIGHUP,
sig_int = SIGINT,
sig_quit = SIGQUIT,
sig_ill = SIGILL,
sig_abrt = SIGABRT,
sig_fpe = SIGFPE,
sig_kill = SIGKILL,
sig_segv = SIGSEGV,
sig_pipe = SIGPIPE,
sig_alrm = SIGALRM,
sig_term = SIGTERM,
sig_usr1 = SIGUSR1,
sig_usr2 = SIGUSR2,
sig_chld = SIGCHLD,
sig_cont = SIGCONT,
sig_stop = SIGSTOP,
sig_tstp = SIGTSTP,
sig_ttin = SIGTTIN,
sig_ttou = SIGTTOU
};
/**
* @brief The SignalTrap class encapsulates functionality to trap and handle signals.
*/
class CORE_POSIX_DLL_PUBLIC SignalTrap
{
public:
SignalTrap(const SignalTrap&) = delete;
virtual ~SignalTrap() = default;
SignalTrap& operator=(const SignalTrap&) = delete;
bool operator==(const SignalTrap&) const = delete;
/**
* @brief Returns true if the given signal is trapped by this instance.
*/
virtual bool has(Signal signal) = 0;
/**
* @brief Starts observation of incoming signals, relaying them via
* signal_raised(). The call blocks until stop is called.
*/
virtual void run() = 0;
/**
* @brief Stops execution of the signal trap.
*/
virtual void stop() = 0;
/**
* @brief Emitted whenever a trapped signal is raised by the operating system.
*/
virtual core::Signal<Signal>& signal_raised() = 0;
protected:
SignalTrap() = default;
};
/**
* @brief Traps the specified signals for the entire process.
*/
CORE_POSIX_DLL_PUBLIC
std::shared_ptr<SignalTrap> trap_signals_for_process(
std::initializer_list<core::posix::Signal> blocked_signals);
/**
* @brief Traps the specified signals for the current thread, and inherits
* the respective signal mask to all child-threads.
*/
CORE_POSIX_DLL_PUBLIC
std::shared_ptr<SignalTrap> trap_signals_for_all_subsequent_threads(
std::initializer_list<core::posix::Signal> blocked_signals);
}
}
#endif
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