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1 | /* Change a port cell to a directory in an open file descriptor. | |
2 | Copyright (C) 1999-2015 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <errno.h> | |
20 | #include <unistd.h> | |
21 | #include <hurd.h> | |
22 | #include <hurd/port.h> | |
23 | #include <hurd/fd.h> | |
24 | #include <fcntl.h> | |
25 | ||
26 | int | |
27 | _hurd_change_directory_port_from_fd (struct hurd_port *portcell, int fd) | |
28 | { | |
29 | int ret; | |
30 | struct hurd_fd *d = _hurd_fd_get (fd); | |
31 | ||
32 | if (!d) | |
33 | return __hurd_fail (EBADF); | |
34 | ||
35 | HURD_CRITICAL_BEGIN; | |
36 | ||
37 | ret = HURD_PORT_USE (&d->port, | |
38 | ({ | |
39 | int ret; | |
40 | /* We look up "." to force ENOTDIR if it's not a | |
41 | directory and EACCES if we don't have search | |
42 | permission. */ | |
43 | file_t dir = __file_name_lookup_under (port, ".", | |
44 | O_NOTRANS, 0); | |
45 | if (dir == MACH_PORT_NULL) | |
46 | ret = -1; | |
47 | else | |
48 | { | |
49 | _hurd_port_set (portcell, dir); | |
50 | ret = 0; | |
51 | } | |
52 | ret; | |
53 | })); | |
54 | ||
55 | HURD_CRITICAL_END; | |
56 | ||
57 | return ret; | |
58 | } |