Commit | Line | Data |
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18848e28 GF |
1 | /* dirfd.c -- return the file descriptor associated with an open DIR* |
2 | ||
5df4cba6 | 3 | Copyright (C) 2001, 2006, 2008-2020 Free Software Foundation, Inc. |
18848e28 GF |
4 | |
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program 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 | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
c0c3707f | 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
18848e28 GF |
17 | |
18 | /* Written by Jim Meyering. */ | |
19 | ||
20 | #include <config.h> | |
21 | ||
22 | #include <dirent.h> | |
23 | #include <errno.h> | |
24 | ||
49e4877c PA |
25 | #ifdef __KLIBC__ |
26 | # include <stdlib.h> | |
27 | # include <io.h> | |
28 | ||
29 | static struct dirp_fd_list | |
30 | { | |
31 | DIR *dirp; | |
32 | int fd; | |
33 | struct dirp_fd_list *next; | |
34 | } *dirp_fd_start = NULL; | |
35 | ||
36 | /* Register fd associated with dirp to dirp_fd_list. */ | |
37 | int | |
38 | _gl_register_dirp_fd (int fd, DIR *dirp) | |
39 | { | |
40 | struct dirp_fd_list *new_dirp_fd = malloc (sizeof *new_dirp_fd); | |
41 | if (!new_dirp_fd) | |
42 | return -1; | |
43 | ||
44 | new_dirp_fd->dirp = dirp; | |
45 | new_dirp_fd->fd = fd; | |
46 | new_dirp_fd->next = dirp_fd_start; | |
47 | ||
48 | dirp_fd_start = new_dirp_fd; | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
53 | /* Unregister fd from dirp_fd_list with closing it */ | |
54 | void | |
55 | _gl_unregister_dirp_fd (int fd) | |
56 | { | |
57 | struct dirp_fd_list *dirp_fd; | |
58 | struct dirp_fd_list *dirp_fd_prev; | |
59 | ||
60 | for (dirp_fd_prev = NULL, dirp_fd = dirp_fd_start; dirp_fd; | |
61 | dirp_fd_prev = dirp_fd, dirp_fd = dirp_fd->next) | |
62 | { | |
63 | if (dirp_fd->fd == fd) | |
64 | { | |
65 | if (dirp_fd_prev) | |
66 | dirp_fd_prev->next = dirp_fd->next; | |
67 | else /* dirp_fd == dirp_fd_start */ | |
68 | dirp_fd_start = dirp_fd_start->next; | |
69 | ||
70 | close (fd); | |
71 | free (dirp_fd); | |
72 | break; | |
73 | } | |
74 | } | |
75 | } | |
76 | #endif | |
77 | ||
18848e28 GF |
78 | int |
79 | dirfd (DIR *dir_p) | |
80 | { | |
81 | int fd = DIR_TO_FD (dir_p); | |
82 | if (fd == -1) | |
49e4877c | 83 | #ifndef __KLIBC__ |
18848e28 | 84 | errno = ENOTSUP; |
49e4877c PA |
85 | #else |
86 | { | |
87 | struct dirp_fd_list *dirp_fd; | |
88 | ||
89 | for (dirp_fd = dirp_fd_start; dirp_fd; dirp_fd = dirp_fd->next) | |
90 | if (dirp_fd->dirp == dir_p) | |
91 | return dirp_fd->fd; | |
92 | ||
93 | errno = EINVAL; | |
94 | } | |
95 | #endif | |
96 | ||
18848e28 GF |
97 | return fd; |
98 | } |