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85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
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/*-
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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 10.13 (Sleepycat) 4/17/98";
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#endif /* not lint */
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#include "db_int.h"
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/*
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* __db_fileid --
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* Return a unique identifier for a file.
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*/
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int
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__db_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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size_t i;
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time_t now;
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u_int8_t *p;
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/*
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* The documentation for GetFileInformationByHandle() states that the
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* inode-type numbers are not constant between processes. Actually,
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* they are, they're the NTFS MFT indexes. So, this works on NTFS,
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* but perhaps not on other platforms, and perhaps not over a network.
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* Can't think of a better solution right now.
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*/
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int fd = 0;
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HANDLE fh = 0;
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BY_HANDLE_FILE_INFORMATION fi;
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BOOL retval = FALSE;
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/* Clear the buffer. */
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memset(fidp, 0, DB_FILE_ID_LEN);
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/* first we open the file, because we're not given a handle to it */
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fd = __os_open(fname,_O_RDONLY,_S_IREAD);
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if (-1 == fd) {
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/* If we can't open it, we're in trouble */
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return (errno);
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}
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/* File open, get its info */
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fh = (HANDLE)_get_osfhandle(fd);
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if ((HANDLE)(-1) != fh) {
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retval = GetFileInformationByHandle(fh,&fi);
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}
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__os_close(fd);
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/*
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* We want the three 32-bit words which tell us the volume ID and
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* the file ID. We make a crude attempt to copy the bytes over to
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* the callers buffer.
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*
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* DBDB: really we should ensure that the bytes get packed the same
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* way on all compilers, platforms etc.
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*/
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if ( ((HANDLE)(-1) != fh) && (TRUE == retval) ) {
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memcpy(fidp, &fi.nFileIndexLow, sizeof(u_int32_t));
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fidp += sizeof(u_int32_t);
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memcpy(fidp, &fi.nFileIndexHigh, sizeof(u_int32_t));
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fidp += sizeof(u_int32_t);
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memcpy(fidp, &fi.dwVolumeSerialNumber, sizeof(u_int32_t));
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fidp += sizeof(u_int32_t);
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}
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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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