genode/repos/libports/include/libc/select.h

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/*
* \brief Support for handling select() in LibC components
* \author Christian Helmuth
* \date 2017-02-13
*/
/*
* Copyright (C) 2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__LIBC__SELECT_H_
#define _INCLUDE__LIBC__SELECT_H_
/* Libc includes */
#include <sys/select.h> /* for fd_set */
namespace Libc {
struct Select_cb;
typedef Genode::Constructible<Libc::Select_cb> Select_handler_cb;
struct Select_handler_base
{
Select_handler_cb *_select_cb;
Select_handler_base();
~Select_handler_base();
/**
* Traditional select()
*
* \returns 0 if no descriptor was ready and schedules for later call
* of select_ready(), or number of currently ready file
* descriptors. The latter case does not schedule
* select_ready().
*/
int select(int nfds, fd_set &readfds, fd_set &writefds, fd_set &exceptfds);
virtual void select_ready(int nready, fd_set const &, fd_set const &, fd_set const &) = 0;
/* \noapi */
void dispatch_select();
};
template <typename T>
struct Select_handler : Select_handler_base
{
T &obj;
void (T::*member) (int, fd_set const &, fd_set const &, fd_set const &);
Select_handler(T &obj,
void (T::*member)(int, fd_set const &, fd_set const &, fd_set const &))
: obj(obj), member(member) { }
void select_ready(int nready, fd_set const &readfds,
fd_set const &writefds, fd_set const &exceptfds) override
{
(obj.*member)(nready, readfds, writefds, exceptfds);
}
};
}
#endif /* _INCLUDE__LIBC__SELECT_H_ */