FileCache.h
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- /* $Id: FileCache.h,v 1.1.1.1 2005/11/11 21:32:03 faxguy Exp $ */
- /*
- * Copyright (c) 1995-1996 Sam Leffler
- * Copyright (c) 1995-1996 Silicon Graphics, Inc.
- * HylaFAX is a trademark of Silicon Graphics
- *
- * Permission to use, copy, modify, distribute, and sell this software and
- * its documentation for any purpose is hereby granted without fee, provided
- * that (i) the above copyright notices and this permission notice appear in
- * all copies of the software and related documentation, and (ii) the names of
- * Sam Leffler and Silicon Graphics may not be used in any advertising or
- * publicity relating to the software without the specific, prior written
- * permission of Sam Leffler and Silicon Graphics.
- *
- * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
- * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
- *
- * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
- * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
- * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
- * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
- * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
- * OF THIS SOFTWARE.
- */
- #ifndef _FileCache_
- #define _FileCache_
- #include "Str.h"
- #include <sys/stat.h>
- /*
- * Cache to reduce the number of stat system calls.
- */
- struct FileCache {
- fxStr name;
- struct stat sb;
- u_int serial;
- static u_int master; // master serial # generator
- static FileCache* cache[4096];
- // statistics
- static u_int lookups; // total # lookups
- static u_int hits; // # lookups that hit in the cache
- static u_int probes; // total # probes during lookups
- static u_int displaced; // # entries reused
- static u_int flushed; // # entries flushed
- static void printStats(FILE*);
- FileCache();
- ~FileCache();
- static u_int hash(const char* pathname);
- static bool lookup(const char* pathname, struct stat& sb,
- bool addToCache = true);
- static bool update(const char* pathname, struct stat& sb,
- bool addToCache = true);
- static void flush(const char* pathname);
- static bool chmod(const char* pathname, mode_t mode);
- static bool chown(const char* pathname, uid_t uid, gid_t gid);
- static void reset(void);
- };
- #endif /* _FileCache_ */