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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997, 1998
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)os_fid.c 10.12 (Sleepycat) 7/21/98";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#endif
#include "db_int.h"
#include "common_ext.h"
/*
* __os_fileid --
* Return a unique identifier for a file.
*
* PUBLIC: int __os_fileid __P((DB_ENV *, const char *, int, u_int8_t *));
*/
int
__os_fileid(dbenv, fname, timestamp, fidp)
DB_ENV *dbenv;
const char *fname;
int timestamp;
u_int8_t *fidp;
{
struct stat sb;
size_t i;
time_t now;
u_int8_t *p;
/* Clear the buffer. */
memset(fidp, 0, DB_FILE_ID_LEN);
/* Check for the unthinkable. */
if (sizeof(sb.st_ino) +
sizeof(sb.st_dev) + sizeof(time_t) > DB_FILE_ID_LEN)
return (EINVAL);
/* On UNIX, use a dev/inode pair. */
if (stat(fname, &sb)) {
__db_err(dbenv, "%s: %s", fname, strerror(errno));
return (errno);
}
/*
* Use the inode first and in reverse order, hopefully putting the
* distinguishing information early in the string.
*/
for (p = (u_int8_t *)&sb.st_ino +
sizeof(sb.st_ino), i = 0; i < sizeof(sb.st_ino); ++i)
*fidp++ = *--p;
for (p = (u_int8_t *)&sb.st_dev +
sizeof(sb.st_dev), i = 0; i < sizeof(sb.st_dev); ++i)
*fidp++ = *--p;
if (timestamp) {
(void)time(&now);
for (p = (u_int8_t *)&now +
sizeof(now), i = 0; i < sizeof(now); ++i)
*fidp++ = *--p;
}
return (0);
}
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