86 lines
2.1 KiB
C++
86 lines
2.1 KiB
C++
/*
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* Copyright 2003-2021 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef EVENT_EPOLL_BACKEND_HXX
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#define EVENT_EPOLL_BACKEND_HXX
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#include "system/EpollFD.hxx"
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#include <array>
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#include <algorithm>
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class EpollBackendResult
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{
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friend class EpollBackend;
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std::array<epoll_event, 16> events;
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size_t n_events = 0;
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public:
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size_t GetSize() const noexcept {
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return n_events;
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}
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unsigned GetEvents(size_t i) const noexcept {
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return events[i].events;
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}
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void *GetObject(size_t i) const noexcept {
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return events[i].data.ptr;
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}
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};
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class EpollBackend
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{
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EpollFD epoll;
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EpollBackend(EpollBackend &) = delete;
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EpollBackend &operator=(EpollBackend &) = delete;
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public:
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EpollBackend() = default;
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auto ReadEvents(int timeout_ms) noexcept {
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EpollBackendResult result;
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int ret = epoll.Wait(result.events.data(), result.events.size(),
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timeout_ms);
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result.n_events = std::max(0, ret);
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return result;
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}
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bool Add(int fd, unsigned events, void *obj) noexcept {
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return epoll.Add(fd, events, obj);
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}
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bool Modify(int fd, unsigned events, void *obj) noexcept {
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return epoll.Modify(fd, events, obj);
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}
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bool Remove(int fd) noexcept {
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return epoll.Remove(fd);
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}
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bool Abandon([[maybe_unused]] int fd) noexcept {
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// Nothing to do in this implementation.
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// Closed descriptors are automatically unregistered.
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return true;
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}
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};
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#endif
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