1 | /* Copyright (C) 2001-2024 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <dirent.h> |
19 | #include <stddef.h> |
20 | #include <hurd.h> |
21 | #include <hurd/fs.h> |
22 | #include <hurd/fd.h> |
23 | #include "dirstream.h" |
24 | |
25 | /* Read a directory entry from DIRP. */ |
26 | struct dirent64 * |
27 | __readdir64 (DIR *dirp) |
28 | { |
29 | struct dirent64 *dp; |
30 | |
31 | if (dirp == NULL) |
32 | return __hurd_fail (EINVAL), NULL; |
33 | |
34 | __libc_lock_lock (dirp->__lock); |
35 | |
36 | do |
37 | { |
38 | if (dirp->__ptr - dirp->__data >= dirp->__size) |
39 | { |
40 | /* We've emptied out our buffer. Refill it. */ |
41 | |
42 | char *data = dirp->__data; |
43 | mach_msg_type_number_t data_size = dirp->__size; |
44 | int nentries; |
45 | error_t err; |
46 | |
47 | if (err = HURD_FD_PORT_USE (dirp->__fd, |
48 | __dir_readdir (port, |
49 | &data, &data_size, |
50 | dirp->__entry_ptr, |
51 | -1, 0, &nentries))) |
52 | { |
53 | __hurd_fail (err); |
54 | dp = NULL; |
55 | break; |
56 | } |
57 | |
58 | dirp->__size = data_size; |
59 | /* DATA now corresponds to entry index DIRP->__entry_ptr. */ |
60 | dirp->__entry_data = dirp->__entry_ptr; |
61 | |
62 | if (data != dirp->__data) |
63 | { |
64 | /* The data was passed out of line, so our old buffer is no |
65 | longer useful. Deallocate the old buffer and reset our |
66 | information for the new buffer. */ |
67 | if (dirp->__data != NULL) |
68 | { |
69 | err = __vm_deallocate (__mach_task_self (), |
70 | (vm_address_t) dirp->__data, |
71 | dirp->__allocation); |
72 | assert_perror (err); |
73 | } |
74 | dirp->__data = data; |
75 | dirp->__allocation = round_page (dirp->__size); |
76 | } |
77 | |
78 | /* Reset the pointer into the buffer. */ |
79 | dirp->__ptr = dirp->__data; |
80 | |
81 | if (nentries == 0) |
82 | { |
83 | /* End of file. */ |
84 | dp = NULL; |
85 | break; |
86 | } |
87 | |
88 | /* We trust the filesystem to return correct data and so we |
89 | ignore NENTRIES. */ |
90 | } |
91 | |
92 | dp = (struct dirent64 *) dirp->__ptr; |
93 | dirp->__ptr += dp->d_reclen; |
94 | ++dirp->__entry_ptr; |
95 | |
96 | /* Loop to ignore deleted files. */ |
97 | } while (dp->d_fileno == 0); |
98 | |
99 | __libc_lock_unlock (dirp->__lock); |
100 | |
101 | return dp; |
102 | } |
103 | |
104 | libc_hidden_def (__readdir64) |
105 | weak_alias (__readdir64, readdir64) |
106 | |