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
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/param.h>
39 #include <sys/malloc.h>
40 #include <sys/proc.h>
41 #include <sys/vnode.h>
42
43 #ifdef COMPAT_LINUX32
44 #include <machine/../linux32/linux.h>
45 #include <machine/../linux32/linux32_proto.h>
46 #else
47 #include <machine/../linux/linux.h>
48 #include <machine/../linux/linux_proto.h>
49 #endif
50 #include <compat/linux/linux_misc.h>
51
52 /*
53 * Find pathname of process's current directory.
54 */
55 int
linux_getcwd(struct thread * td,struct linux_getcwd_args * uap)56 linux_getcwd(struct thread *td, struct linux_getcwd_args *uap)
57 {
58 char *buf, *retbuf;
59 size_t buflen;
60 int error;
61
62 buflen = uap->bufsize;
63 if (__predict_false(buflen < 2))
64 return (ERANGE);
65 if (buflen > LINUX_PATH_MAX)
66 buflen = LINUX_PATH_MAX;
67
68 buf = malloc(buflen, M_TEMP, M_WAITOK);
69 error = vn_getcwd(buf, &retbuf, &buflen);
70 if (error == ENOMEM)
71 error = ERANGE;
72 if (error == 0) {
73 error = copyout(retbuf, uap->buf, buflen);
74 if (error == 0)
75 td->td_retval[0] = buflen;
76 }
77 free(buf, M_TEMP);
78 return (error);
79 }
80