mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-29 10:08:53 +00:00
68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
/*
|
|
* \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 Affero General Public License version 3.
|
|
*/
|
|
|
|
#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_ */
|