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105 lines
2.7 KiB
105 lines
2.7 KiB
3 years ago
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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, 1999
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* Sleepycat Software. All rights reserved.
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*/
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#include "db_config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)os_fid.c 11.1 (Sleepycat) 7/25/99";
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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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#if TIME_WITH_SYS_TIME
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#include <sys/time.h>
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#include <time.h>
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#else
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#if HAVE_SYS_TIME_H
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#include <sys/time.h>
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#else
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#include <time.h>
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#endif
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#endif
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#include <string.h>
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#endif
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#include "db_int.h"
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/*
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* CDB___os_fileid --
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* Return a unique identifier for a file.
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*
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* PUBLIC: int CDB___os_fileid __P((DB_ENV *, const char *, int, u_int8_t *));
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*/
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int
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CDB___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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u_int32_t tmp;
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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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/* On POSIX/UNIX, use a dev/inode pair. */
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if (stat(fname, &sb)) {
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CDB___db_err(dbenv, "%s: %s", fname, strerror(CDB___os_get_errno()));
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return (CDB___os_get_errno());
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}
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/*
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* !!!
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* Nothing is ever big enough -- on Sparc V9, st_ino, st_dev and the
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* time_t types are all 8 bytes. As DB_FILE_ID_LEN is only 20 bytes,
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* we convert to a (potentially) smaller fixed-size type and use it.
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*
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* We don't worry about byte sexing or the actual variable sizes.
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*
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* When this routine is called from the DB access methods, it's only
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* called once -- whatever ID is generated when a database is created
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* is stored in the database file's metadata, and that is what is
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* saved in the mpool region's information to uniquely identify the
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* file.
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*
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* When called from the mpool layer this routine will be called each
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* time a new thread of control wants to share the file, which makes
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* things tougher. As far as byte sexing goes, since the mpool region
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* lives on a single host, there's no issue of that -- the entire
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* region is byte sex dependent. As far as variable sizes go, we make
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* the simplifying assumption that 32-bit and 64-bit processes will
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* get the same 32-bit values if we truncate any returned 64-bit value
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* to a 32-bit value.
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*/
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tmp = (u_int32_t)sb.st_ino;
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for (p = (u_int8_t *)&tmp, i = sizeof(u_int32_t); i > 0; --i)
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*fidp++ = *p++;
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tmp = (u_int32_t)sb.st_dev;
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for (p = (u_int8_t *)&tmp, i = sizeof(u_int32_t); i > 0; --i)
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*fidp++ = *p++;
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if (timestamp) {
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/*
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* We want the number of seconds, not the high-order 0 bits,
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* so convert the returned time_t to a (potentially) smaller
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* fixed-size type.
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*/
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tmp = (u_int32_t)time(NULL);
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for (p = (u_int8_t *)&tmp, i = sizeof(u_int32_t); i > 0; --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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