53 lines
1011 B
C
53 lines
1011 B
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 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_seek.c 10.11 (Sleepycat) 10/12/98";
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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 <errno.h>
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#include <unistd.h>
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#endif
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#include "db_int.h"
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#include "os_jump.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((int, size_t, db_pgno_t, u_int32_t, int, int));
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*/
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int
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__os_seek(fd, pgsize, pageno, relative, isrewind, whence)
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int fd;
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size_t pgsize;
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db_pgno_t pageno;
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u_int32_t relative;
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int isrewind, whence;
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{
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off_t offset;
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int ret;
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if (__db_jump.j_seek != NULL)
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ret = __db_jump.j_seek(fd,
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pgsize, pageno, relative, isrewind, whence);
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else {
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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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ret = lseek(fd, offset, whence);
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}
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return (ret == -1 ? errno : 0);
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}
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