1 | /* Copyright (C) 1991-2022 Free Software Foundation, Inc. |
2 | |
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 <hurd.h> |
20 | |
21 | /* This is initialized in dtable.c when that gets linked in. |
22 | If dtable.c is not linked in, it will be zero. */ |
23 | static file_t (*_default_hurd_getdport_fn) (int fd) = 0; |
24 | weak_alias (_default_hurd_getdport_fn, _hurd_getdport_fn) |
25 | |
26 | file_t |
27 | __getdport (int fd) |
28 | { |
29 | if (_hurd_getdport_fn) |
30 | /* dtable.c has defined the function to fetch a port from the real file |
31 | descriptor table. */ |
32 | return (*_hurd_getdport_fn) (fd); |
33 | |
34 | /* getdport is the only use of file descriptors, |
35 | so we don't bother allocating a real table. */ |
36 | |
37 | if (_hurd_init_dtable == NULL) |
38 | { |
39 | /* Never had a descriptor table. */ |
40 | errno = EBADF; |
41 | return MACH_PORT_NULL; |
42 | } |
43 | |
44 | if (fd < 0 || (unsigned int) fd > _hurd_init_dtablesize |
45 | || _hurd_init_dtable[fd] == MACH_PORT_NULL) |
46 | { |
47 | errno = EBADF; |
48 | return MACH_PORT_NULL; |
49 | } |
50 | else |
51 | { |
52 | __mach_port_mod_refs (__mach_task_self (), _hurd_init_dtable[fd], |
53 | MACH_PORT_RIGHT_SEND, 1); |
54 | return _hurd_init_dtable[fd]; |
55 | } |
56 | } |
57 | |
58 | weak_alias (__getdport, getdport) |
59 | |