/* map.h -- memory mapping functions
 * $Id: map.h,v 1.5 2005/03/05 00:37:17 dasenbro Exp $
 *
 * Copyright (c) 1998-2003 Carnegie Mellon University.  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
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 *    distribution.
 *
 * 3. The name "Carnegie Mellon University" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For permission or any other legal
 *    details, please contact  
 *      Office of Technology Transfer
 *      Carnegie Mellon University
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 * 4. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Computing Services
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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#ifndef INCLUDED_MAP_H
#define INCLUDED_MAP_H

#define MAP_UNKNOWN_LEN ((unsigned long)-1)

extern const char *map_method_desc;

/* Create a memory map
 *
 * fd is the file descriptor which is to be mapped
 * onceonly is set to be nonzero if you do not intend to ever refresh the map
 * base and len are output parameters that receive the address and length
 * 	of the map once it is created.  NOTE: *len should be zero the first
 * 	time map_refresh() is called to force the initial mapping
 * newlen is set to the size of the file, or MAP_UNKNOWN_LEN to have the
 * 	mapping facility compute it for you.
 * name and mboxname are used for logging purposes, name is the name
 * 	of the file, and shouldn't be NULL, while mboxname is the name
 * 	of the applicable mailbox (if any), and may be NULL
 */
extern void map_refresh(int fd, int onceonly, const char **base,
			unsigned long *len, unsigned long newlen,
			const char *name, const char *mboxname);

/* map_free will free a memory map allocated by map_refresh
 *
 * base and len are the same values that were passed to map_refresh */
extern void map_free(const char **base, unsigned long *len);

#endif /* INCLUDED_MAP_H */
