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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1997, 1998
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)os_seek.c 10.11 (Sleepycat) 10/12/98";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#endif
#include "db_int.h"
#include "os_jump.h"
/*
* __os_seek --
* Seek to a page/byte offset in the file.
*
* PUBLIC: int __os_seek __P((int, size_t, db_pgno_t, u_int32_t, int, int));
*/
int
__os_seek(fd, pgsize, pageno, relative, isrewind, whence)
int fd;
size_t pgsize;
db_pgno_t pageno;
u_int32_t relative;
int isrewind, whence;
{
off_t offset;
int ret;
if (__db_jump.j_seek != NULL)
ret = __db_jump.j_seek(fd,
pgsize, pageno, relative, isrewind, whence);
else {
offset = (off_t)pgsize * pageno + relative;
if (isrewind)
offset = -offset;
ret = lseek(fd, offset, whence);
}
return (ret == -1 ? errno : 0);
}
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