1/*	$NetBSD: linux_llseek.c,v 1.35 2021/09/23 06:56:27 ryo Exp $	*/
2
3/*-
4 * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Frank van der Linden and Eric Haszlakiewicz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: linux_llseek.c,v 1.35 2021/09/23 06:56:27 ryo Exp $");
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/kernel.h>
38#include <sys/mount.h>
39#include <sys/conf.h>
40
41#include <sys/sched.h>
42#include <sys/syscallargs.h>
43
44#include <compat/linux/common/linux_types.h>
45#include <compat/linux/common/linux_signal.h>
46#include <compat/linux/common/linux_fcntl.h>
47#include <compat/linux/common/linux_util.h>
48
49#include <compat/linux/linux_syscallargs.h>
50
51/* Used on: arm, i386, m68k, mips, ppc, sparc */
52/* Not used on: aarch64, alpha, sparc64 */
53
54/*
55 * This appears to be part of a Linux attempt to switch to 64 bits file sizes.
56 */
57int
58linux_sys_llseek(struct lwp *l, const struct linux_sys_llseek_args *uap, register_t *retval)
59{
60	/* {
61		syscallarg(int) fd;
62		syscallarg(uint32_t) ohigh;
63		syscallarg(uint32_t) olow;
64		syscallarg(void *) res;
65		syscallarg(int) whence;
66	} */
67	struct sys_lseek_args bla;
68	int error;
69	off_t off;
70
71	off = SCARG(uap, olow) | (((off_t) SCARG(uap, ohigh)) << 32);
72
73	SCARG(&bla, fd) = SCARG(uap, fd);
74	SCARG(&bla, offset) = off;
75	SCARG(&bla, whence) = SCARG(uap, whence);
76
77	if ((error = sys_lseek(l, &bla, retval)))
78		return error;
79
80	if ((error = copyout(retval, SCARG(uap, res), sizeof (off_t))))
81		return error;
82
83	retval[0] = 0;
84	return 0;
85}
86