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 * Copyright (c) 1999 The NetBSD Foundation, Inc.
5 * Copyright (c) 2015 The FreeBSD Foundation
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Bill Sommerfeld.
10 *
11 * Portions of this software were developed by Edward Tomasz Napierala
12 * under sponsorship from the FreeBSD Foundation.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 *    notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 *    notice, this list of conditions and the following disclaimer in the
21 *    documentation and/or other materials provided with the distribution.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD$");
38
39#include "opt_compat.h"
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/syscallsubr.h>
44#include <sys/proc.h>
45#include <sys/malloc.h>
46
47#ifdef COMPAT_LINUX32
48#include <machine/../linux32/linux.h>
49#include <machine/../linux32/linux32_proto.h>
50#else
51#include <machine/../linux/linux.h>
52#include <machine/../linux/linux_proto.h>
53#endif
54#include <compat/linux/linux_misc.h>
55#include <compat/linux/linux_util.h>
56
57/*
58 * Find pathname of process's current directory.
59 */
60int
61linux_getcwd(struct thread *td, struct linux_getcwd_args *args)
62{
63	char *path;
64	int error, lenused;
65
66#ifdef DEBUG
67	if (ldebug(getcwd))
68		printf(ARGS(getcwd, "%p, %ld"), args->buf, (long)args->bufsize);
69#endif
70
71	/*
72	 * Linux returns ERANGE instead of EINVAL.
73	 */
74	if (args->bufsize < 2)
75		return (ERANGE);
76
77	path = malloc(LINUX_PATH_MAX, M_LINUX, M_WAITOK);
78
79	error = kern___getcwd(td, path, UIO_SYSSPACE, args->bufsize,
80	    LINUX_PATH_MAX);
81	if (error == 0) {
82		lenused = strlen(path) + 1;
83		error = copyout(path, args->buf, lenused);
84		if (error == 0)
85			td->td_retval[0] = lenused;
86	}
87
88	free(path, M_LINUX);
89	return (error);
90}
91