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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1997,2007 Oracle. All rights reserved.
*
* $Id: os_seek.c,v 12.13 2007/05/17 15:15:46 bostic Exp $
*/
#include "db_config.h"
#include "db_int.h"
/*
* __os_seek --
* Seek to a page/byte offset in the file.
*
* PUBLIC: int __os_seek __P((DB_ENV *,
* PUBLIC: DB_FH *, db_pgno_t, u_int32_t, u_int32_t));
*/
int
__os_seek(dbenv, fhp, pgno, pgsize, relative)
DB_ENV *dbenv;
DB_FH *fhp;
db_pgno_t pgno;
u_int32_t pgsize;
u_int32_t relative;
{
off_t offset;
int ret;
DB_ASSERT(dbenv, F_ISSET(fhp, DB_FH_OPENED) && fhp->fd != -1);
offset = (off_t)pgsize * pgno + relative;
if (dbenv != NULL && FLD_ISSET(dbenv->verbose, DB_VERB_FILEOPS_ALL))
__db_msg(dbenv,
"fileops: seek %s to %lu", fhp->name, (u_long)offset);
if (DB_GLOBAL(j_seek) != NULL)
ret = DB_GLOBAL(j_seek)(fhp->fd, offset, SEEK_SET);
else
RETRY_CHK((lseek(
fhp->fd, offset, SEEK_SET) == -1 ? 1 : 0), ret);
if (ret == 0) {
fhp->pgsize = pgsize;
fhp->pgno = pgno;
fhp->offset = relative;
} else {
__db_syserr(dbenv, ret,
"seek: %lu: (%lu * %lu) + %lu", (u_long)offset,
(u_long)pgno, (u_long)pgsize, (u_long)relative);
ret = __os_posix_err(ret);
}
return (ret);
}
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