71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
/*
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* \brief Support for handling select() in LibC components
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* \author Christian Helmuth
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* \date 2017-02-13
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*/
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/*
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* Copyright (C) 2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__LIBC__SELECT_H_
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#define _INCLUDE__LIBC__SELECT_H_
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/* Genode includes */
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#include <util/reconstructible.h>
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/* libc includes */
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#include <sys/select.h> /* for fd_set */
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namespace Libc {
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struct Select_cb;
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typedef Genode::Constructible<Libc::Select_cb> Select_handler_cb;
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struct Select_handler_base
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{
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Select_handler_cb *_select_cb;
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Select_handler_base();
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~Select_handler_base();
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/**
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* Traditional select()
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*
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* \returns 0 if no descriptor was ready and schedules for later call
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* of select_ready(), or number of currently ready file
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* descriptors. The latter case does not schedule
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* select_ready().
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*/
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int select(int nfds, fd_set &readfds, fd_set &writefds, fd_set &exceptfds);
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virtual void select_ready(int nready, fd_set const &, fd_set const &, fd_set const &) = 0;
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/* \noapi */
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void dispatch_select();
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};
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template <typename T>
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struct Select_handler : Select_handler_base
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{
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T &obj;
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void (T::*member) (int, fd_set const &, fd_set const &, fd_set const &);
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Select_handler(T &obj,
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void (T::*member)(int, fd_set const &, fd_set const &, fd_set const &))
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: obj(obj), member(member) { }
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void select_ready(int nready, fd_set const &readfds,
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fd_set const &writefds, fd_set const &exceptfds) override
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{
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(obj.*member)(nready, readfds, writefds, exceptfds);
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}
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};
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}
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#endif /* _INCLUDE__LIBC__SELECT_H_ */
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