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77 lines
1.5 KiB
C
77 lines
1.5 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1997-2005
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* Sleepycat Software. All rights reserved.
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*
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* $Id: os_seek.c,v 12.2 2005/08/10 15:47:27 bostic Exp $
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*/
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#include "db_config.h"
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <stdlib.h>
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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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* __os_seek --
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* Seek to a page/byte offset in the file.
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*
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* PUBLIC: int __os_seek __P((DB_ENV *,
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* PUBLIC: DB_FH *, u_int32_t, db_pgno_t, u_int32_t, int, DB_OS_SEEK));
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*/
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int
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__os_seek(dbenv, fhp, pgsize, pageno, relative, isrewind, db_whence)
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DB_ENV *dbenv;
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DB_FH *fhp;
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u_int32_t pgsize;
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db_pgno_t pageno;
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u_int32_t relative;
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int isrewind;
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DB_OS_SEEK db_whence;
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{
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off_t offset;
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int ret, whence;
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/* Check for illegal usage. */
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DB_ASSERT(F_ISSET(fhp, DB_FH_OPENED) && fhp->fd != -1);
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switch (db_whence) {
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case DB_OS_SEEK_CUR:
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whence = SEEK_CUR;
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break;
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case DB_OS_SEEK_END:
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whence = SEEK_END;
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break;
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case DB_OS_SEEK_SET:
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whence = SEEK_SET;
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break;
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default:
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return (EINVAL);
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}
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offset = (off_t)pgsize * pageno + relative;
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if (isrewind)
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offset = -offset;
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if (DB_GLOBAL(j_seek) != NULL)
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ret = DB_GLOBAL(j_seek)(fhp->fd, offset, whence);
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else
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RETRY_CHK((lseek(fhp->fd, offset, whence) == -1 ? 1 : 0), ret);
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if (ret == 0) {
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fhp->pgsize = pgsize;
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fhp->pgno = pageno;
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fhp->offset = relative;
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} else
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__db_err(dbenv, "seek: %lu %d %d: %s",
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(u_long)pgsize * pageno + relative,
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isrewind, db_whence, strerror(ret));
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return (ret);
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}
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