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