genode/libports/include/libc-plugin/fd_alloc.h
2012-01-03 15:35:05 +01:00

70 lines
1.2 KiB
C++

/*
* \brief file descriptor allocator interface
* \author Christian Prochaska
* \date 2010-01-21
*
*/
/*
* Copyright (C) 2010-2012 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 _LIBC_PLUGIN__FD_ALLOC_H_
#define _LIBC_PLUGIN__FD_ALLOC_H_
#include <base/allocator_avl.h>
#include <libc-plugin/plugin.h>
enum { MAX_NUM_FDS = 1024 };
namespace Libc {
/**
* Plugin-specific file-descriptor context
*/
class Plugin_context { };
struct File_descriptor
{
int libc_fd;
Plugin *plugin;
Plugin_context *context;
};
class File_descriptor_allocator : Allocator_avl_tpl<File_descriptor>
{
public:
/**
* Constructor
*/
File_descriptor_allocator();
/**
* Allocate file descriptor
*/
File_descriptor *alloc(Plugin *plugin, Plugin_context *context, int libc_fd = -1);
/**
* Release file descriptor
*/
void free(File_descriptor *fdo);
File_descriptor *find_by_libc_fd(int libc_fd);
};
/**
* Return singleton instance of file-descriptor allocator
*/
extern File_descriptor_allocator *file_descriptor_allocator();
}
#endif /* _LIBC_PLUGIN__FD_ALLOC_H_ */