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/*
* Copyright (c) 2014, Linaro Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef KERNEL_HANDLE_H
#define KERNEL_HANDLE_H
#include <stdint.h>
struct handle_db {
void **ptrs;
size_t max_ptrs;
};
#define HANDLE_DB_INITIALIZER { NULL, 0 }
/*
* Frees all internal data structures of the database, but does not free
* the db pointer. The database is safe to reuse after it's destroyed, it
* just be empty again.
*/
void handle_db_destroy(struct handle_db *db);
/*
* Allocates a new handle and assigns the supplied pointer to it,
* ptr must not be NULL.
* The function returns
* >= 0 on success and
* -1 on failure
*/
int handle_get(struct handle_db *db, void *ptr);
/*
* Deallocates a handle. Returns the assiciated pointer of the handle
* the the handle was valid or NULL if it's invalid.
*/
void *handle_put(struct handle_db *db, int handle);
/*
* Returns the assiciated pointer of the handle if the handle is a valid
* handle.
* Returns NULL on failure.
*/
void *handle_lookup(struct handle_db *db, int handle);
#endif /*KERNEL_HANDLE_H*/
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