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mappedfile.h
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mappedfile.h
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/* mappedfile - interface to a mmaped, lockable, writable file
*
* Copyright (c) 1994-2011 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 _MAPPEDFILE_H
#define _MAPPEDFILE_H
// includes
#include <sys/types.h>
#include <sys/uio.h>
struct mappedfile;
extern int mappedfile_open(struct mappedfile **mfp,
const char *fname, int create);
extern int mappedfile_close(struct mappedfile **mfp);
extern int mappedfile_readlock(struct mappedfile *mf);
extern int mappedfile_writelock(struct mappedfile *mf);
extern int mappedfile_unlock(struct mappedfile *mf);
extern int mappedfile_commit(struct mappedfile *mf);
extern ssize_t mappedfile_pwrite(struct mappedfile *mf,
const char *base, size_t len,
off_t offset);
extern ssize_t mappedfile_pwritev(struct mappedfile *mf,
const struct iovec *iov, int nio,
off_t offset);
extern int mappedfile_truncate(struct mappedfile *mf, off_t offset);
extern int mappedfile_rename(struct mappedfile *mf, const char *newname);
extern int mappedfile_islocked(const struct mappedfile *mf);
extern int mappedfile_isreadlocked(const struct mappedfile *mf);
extern int mappedfile_iswritelocked(const struct mappedfile *mf);
extern const char *mappedfile_base(const struct mappedfile *mf);
extern size_t mappedfile_size(const struct mappedfile *mf);
extern const char *mappedfile_fname(const struct mappedfile *mf);
#endif /* _MAPPEDFILE_H */

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