1/* $OpenBSD: linux_getcwd.c,v 1.2 2001/05/16 12:50:21 ho Exp $ */
2/* $NetBSD: vfs_getcwd.c,v 1.3.2.3 1999/07/11 10:24:09 sommerfeld Exp $ */
3/*-
4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD
5 *
6 * Copyright (c) 1999 The NetBSD Foundation, Inc.
7 * Copyright (c) 2015 The FreeBSD Foundation
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to The NetBSD Foundation
11 * by Bill Sommerfeld.
12 *
13 * Portions of this software were developed by Edward Tomasz Napierala
14 * under sponsorship from the FreeBSD Foundation.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 *    notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 *    notice, this list of conditions and the following disclaimer in the
23 *    documentation and/or other materials provided with the distribution.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD$");
40
41#include "opt_compat.h"
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/syscallsubr.h>
46#include <sys/proc.h>
47#include <sys/malloc.h>
48
49#ifdef COMPAT_LINUX32
50#include <machine/../linux32/linux.h>
51#include <machine/../linux32/linux32_proto.h>
52#else
53#include <machine/../linux/linux.h>
54#include <machine/../linux/linux_proto.h>
55#endif
56#include <compat/linux/linux_misc.h>
57#include <compat/linux/linux_util.h>
58
59/*
60 * Find pathname of process's current directory.
61 */
62int
63linux_getcwd(struct thread *td, struct linux_getcwd_args *args)
64{
65	char *path;
66	int error, lenused;
67
68	/*
69	 * Linux returns ERANGE instead of EINVAL.
70	 */
71	if (args->bufsize < 2)
72		return (ERANGE);
73
74	path = malloc(LINUX_PATH_MAX, M_LINUX, M_WAITOK);
75
76	error = kern___getcwd(td, path, UIO_SYSSPACE, args->bufsize,
77	    LINUX_PATH_MAX);
78	if (error == 0) {
79		lenused = strlen(path) + 1;
80		error = copyout(path, args->buf, lenused);
81		if (error == 0)
82			td->td_retval[0] = lenused;
83	}
84
85	free(path, M_LINUX);
86	return (error);
87}
88