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 */
60 int
61 linux_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_TEMP, 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_TEMP);
89 return (error);
90 }
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