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map.h
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map.h
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/* map.h -- memory mapping functions
*
* Copyright (c) 1994-2008 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
* the documentation and/or other materials provided with the
* 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 legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 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
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#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,
size_t *len, size_t 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, size_t *len);
#endif /* INCLUDED_MAP_H */

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