1 | /* Change a port cell to a directory in an open file descriptor. |
2 | Copyright (C) 1999-2022 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 | <https://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 | retry: |
36 | HURD_CRITICAL_BEGIN; |
37 | |
38 | ret = HURD_PORT_USE (&d->port, |
39 | ({ |
40 | int ret; |
41 | /* We look up "." to force ENOTDIR if it's not a |
42 | directory and EACCES if we don't have search |
43 | permission. */ |
44 | file_t dir = __file_name_lookup_under (port, "." , |
45 | O_NOTRANS, 0); |
46 | if (dir == MACH_PORT_NULL) |
47 | ret = -1; |
48 | else |
49 | { |
50 | _hurd_port_set (portcell, dir); |
51 | ret = 0; |
52 | } |
53 | ret; |
54 | })); |
55 | |
56 | HURD_CRITICAL_END; |
57 | if (ret == -1 && errno == EINTR) |
58 | /* Got a signal while inside an RPC of the critical section, retry again */ |
59 | goto retry; |
60 | |
61 | return ret; |
62 | } |
63 | |