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d614a753 | 1 | /* Copyright (C) 2001-2020 Free Software Foundation, Inc. |
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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 | |
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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. | |
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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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
4c587216 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
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17 | |
18 | #include <dirent.h> | |
4c587216 | 19 | #include <stddef.h> |
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20 | #include <hurd.h> |
21 | #include <hurd/fs.h> | |
22 | #include <hurd/fd.h> | |
23 | #include "dirstream.h" | |
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24 | |
25 | /* Read a directory entry from DIRP. */ | |
26 | struct dirent64 * | |
27 | __readdir64 (DIR *dirp) | |
28 | { | |
337738b7 | 29 | struct dirent64 *dp; |
4c587216 | 30 | |
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31 | if (dirp == NULL) |
32 | { | |
33 | errno = EINVAL; | |
34 | return NULL; | |
35 | } | |
4c587216 | 36 | |
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37 | __libc_lock_lock (dirp->__lock); |
38 | ||
39 | do | |
40 | { | |
41 | if (dirp->__ptr - dirp->__data >= dirp->__size) | |
42 | { | |
43 | /* We've emptied out our buffer. Refill it. */ | |
44 | ||
45 | char *data = dirp->__data; | |
46 | int nentries; | |
47 | error_t err; | |
48 | ||
49 | if (err = HURD_FD_PORT_USE (dirp->__fd, | |
50 | __dir_readdir (port, | |
51 | &data, &dirp->__size, | |
52 | dirp->__entry_ptr, | |
53 | -1, 0, &nentries))) | |
54 | { | |
55 | __hurd_fail (err); | |
56 | dp = NULL; | |
57 | break; | |
58 | } | |
59 | ||
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 | __libc_lock_unlock (dirp->__lock); | |
97 | ||
98 | return dp; | |
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99 | } |
100 | ||
4587a421 | 101 | libc_hidden_def (__readdir64) |
4c587216 | 102 | weak_alias (__readdir64, readdir64) |