xref: /freebsd/sys/compat/linux/linux_getcwd.c (revision e4456411a8c2d4a9bfbccd60f2cf914fd402f817)
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  */
62 int
63 linux_getcwd(struct thread *td, struct linux_getcwd_args *args)
64 {
65 	char *path;
66 	int error, lenused;
67 
68 #ifdef DEBUG
69 	if (ldebug(getcwd))
70 		printf(ARGS(getcwd, "%p, %ld"), args->buf, (long)args->bufsize);
71 #endif
72 
73 	/*
74 	 * Linux returns ERANGE instead of EINVAL.
75 	 */
76 	if (args->bufsize < 2)
77 		return (ERANGE);
78 
79 	path = malloc(LINUX_PATH_MAX, M_LINUX, M_WAITOK);
80 
81 	error = kern___getcwd(td, path, UIO_SYSSPACE, args->bufsize,
82 	    LINUX_PATH_MAX);
83 	if (error == 0) {
84 		lenused = strlen(path) + 1;
85 		error = copyout(path, args->buf, lenused);
86 		if (error == 0)
87 			td->td_retval[0] = lenused;
88 	}
89 
90 	free(path, M_LINUX);
91 	return (error);
92 }
93