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 <string.h> |
21 | #include <hurd.h> |
22 | #include <hurd/fs.h> |
23 | #include <hurd/fd.h> |
24 | #include "dirstream.h" |
25 | |
26 | /* Read a directory entry from DIRP. */ |
27 | int |
28 | __readdir64_r (DIR *dirp, struct dirent64 *entry, struct dirent64 **result) |
29 | { |
30 | struct dirent64 *dp; |
31 | error_t err = 0; |
32 | |
33 | if (dirp == NULL) |
34 | return __hurd_fail (EINVAL), EINVAL; |
35 | |
36 | __libc_lock_lock (dirp->__lock); |
37 | |
38 | do |
39 | { |
40 | if (dirp->__ptr - dirp->__data >= dirp->__size) |
41 | { |
42 | /* We've emptied out our buffer. Refill it. */ |
43 | |
44 | char *data = dirp->__data; |
45 | mach_msg_type_number_t data_size = dirp->__size; |
46 | int nentries; |
47 | |
48 | if (err = HURD_FD_PORT_USE (dirp->__fd, |
49 | __dir_readdir (port, |
50 | &data, &data_size, |
51 | dirp->__entry_ptr, |
52 | -1, 0, &nentries))) |
53 | { |
54 | __hurd_fail (err); |
55 | dp = NULL; |
56 | break; |
57 | } |
58 | |
59 | dirp->__size = data_size; |
60 | /* DATA now corresponds to entry index DIRP->__entry_ptr. */ |
61 | dirp->__entry_data = dirp->__entry_ptr; |
62 | |
63 | if (data != dirp->__data) |
64 | { |
65 | /* The data was passed out of line, so our old buffer is no |
66 | longer useful. Deallocate the old buffer and reset our |
67 | information for the new buffer. */ |
68 | __vm_deallocate (__mach_task_self (), |
69 | (vm_address_t) dirp->__data, |
70 | dirp->__allocation); |
71 | dirp->__data = data; |
72 | dirp->__allocation = round_page (dirp->__size); |
73 | } |
74 | |
75 | /* Reset the pointer into the buffer. */ |
76 | dirp->__ptr = dirp->__data; |
77 | |
78 | if (nentries == 0) |
79 | { |
80 | /* End of file. */ |
81 | dp = NULL; |
82 | break; |
83 | } |
84 | |
85 | /* We trust the filesystem to return correct data and so we |
86 | ignore NENTRIES. */ |
87 | } |
88 | |
89 | dp = (struct dirent64 *) dirp->__ptr; |
90 | dirp->__ptr += dp->d_reclen; |
91 | ++dirp->__entry_ptr; |
92 | |
93 | /* Loop to ignore deleted files. */ |
94 | } while (dp->d_fileno == 0); |
95 | |
96 | if (dp) |
97 | { |
98 | *entry = *dp; |
99 | memcpy (entry->d_name, dp->d_name, dp->d_namlen + 1); |
100 | *result = entry; |
101 | } |
102 | else |
103 | *result = NULL; |
104 | |
105 | __libc_lock_unlock (dirp->__lock); |
106 | |
107 | return dp ? 0 : err ? errno : 0; |
108 | } |
109 | |
110 | weak_alias (__readdir64_r, readdir64_r) |
111 | |