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1 | /* Copyright (C) 1991-2024 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 | /* Never had a descriptor table. */ | |
39 | return __hurd_fail (EBADF), MACH_PORT_NULL; | |
40 | ||
41 | if (fd < 0 || (unsigned int) fd > _hurd_init_dtablesize | |
42 | || _hurd_init_dtable[fd] == MACH_PORT_NULL) | |
43 | return __hurd_fail (EBADF), MACH_PORT_NULL; | |
44 | else | |
45 | { | |
46 | __mach_port_mod_refs (__mach_task_self (), _hurd_init_dtable[fd], | |
47 | MACH_PORT_RIGHT_SEND, 1); | |
48 | return _hurd_init_dtable[fd]; | |
49 | } | |
50 | } | |
51 | ||
52 | weak_alias (__getdport, getdport) |