117 lines
2.9 KiB
C++
117 lines
2.9 KiB
C++
/*
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* Copyright © 2013 Canonical Ltd.
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authored by: Thomas Voß <thomas.voss@canonical.com>
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*/
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#ifndef CORE_POSIX_SIGNAL_H_
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#define CORE_POSIX_SIGNAL_H_
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#include <core/posix/visibility.h>
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#include <core/signal.h>
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#include <signal.h>
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#include <initializer_list>
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#include <memory>
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namespace core
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{
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namespace posix
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{
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/**
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* @brief The Signal enum collects the most common POSIX signals.
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*/
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enum class Signal
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{
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unknown = 0,
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sig_hup = SIGHUP,
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sig_int = SIGINT,
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sig_quit = SIGQUIT,
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sig_ill = SIGILL,
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sig_abrt = SIGABRT,
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sig_fpe = SIGFPE,
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sig_kill = SIGKILL,
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sig_segv = SIGSEGV,
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sig_pipe = SIGPIPE,
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sig_alrm = SIGALRM,
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sig_term = SIGTERM,
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sig_usr1 = SIGUSR1,
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sig_usr2 = SIGUSR2,
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sig_chld = SIGCHLD,
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sig_cont = SIGCONT,
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sig_stop = SIGSTOP,
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sig_tstp = SIGTSTP,
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sig_ttin = SIGTTIN,
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sig_ttou = SIGTTOU
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};
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/**
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* @brief The SignalTrap class encapsulates functionality to trap and handle signals.
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*/
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class CORE_POSIX_DLL_PUBLIC SignalTrap
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{
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public:
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SignalTrap(const SignalTrap&) = delete;
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virtual ~SignalTrap() = default;
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SignalTrap& operator=(const SignalTrap&) = delete;
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bool operator==(const SignalTrap&) const = delete;
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/**
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* @brief Returns true if the given signal is trapped by this instance.
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*/
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virtual bool has(Signal signal) = 0;
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/**
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* @brief Starts observation of incoming signals, relaying them via
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* signal_raised(). The call blocks until stop is called.
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*/
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virtual void run() = 0;
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/**
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* @brief Stops execution of the signal trap.
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*/
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virtual void stop() = 0;
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/**
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* @brief Emitted whenever a trapped signal is raised by the operating system.
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*/
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virtual core::Signal<Signal>& signal_raised() = 0;
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protected:
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SignalTrap() = default;
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};
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/**
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* @brief Traps the specified signals for the entire process.
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*/
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CORE_POSIX_DLL_PUBLIC
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std::shared_ptr<SignalTrap> trap_signals_for_process(
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std::initializer_list<core::posix::Signal> blocked_signals);
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/**
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* @brief Traps the specified signals for the current thread, and inherits
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* the respective signal mask to all child-threads.
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*/
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CORE_POSIX_DLL_PUBLIC
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std::shared_ptr<SignalTrap> trap_signals_for_all_subsequent_threads(
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std::initializer_list<core::posix::Signal> blocked_signals);
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}
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}
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#endif
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