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d4697bc9 | 1 | /* Copyright (C) 2001-2014 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 |
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15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
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17 | |
18 | #include <dirent.h> | |
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19 | #include <stddef.h> |
20 | #include <string.h> | |
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21 | #include <hurd.h> |
22 | #include <hurd/fs.h> | |
23 | #include <hurd/fd.h> | |
24 | #include "dirstream.h" | |
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25 | |
26 | /* Read a directory entry from DIRP. */ | |
27 | int | |
28 | __readdir64_r (DIR *dirp, struct dirent64 *entry, struct dirent64 **result) | |
29 | { | |
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30 | struct dirent64 *dp; |
31 | error_t err = 0; | |
32 | ||
33 | if (dirp == NULL) | |
34 | { | |
35 | errno = EINVAL; | |
36 | return errno; | |
37 | } | |
38 | ||
39 | __libc_lock_lock (dirp->__lock); | |
40 | ||
41 | do | |
42 | { | |
43 | if (dirp->__ptr - dirp->__data >= dirp->__size) | |
44 | { | |
45 | /* We've emptied out our buffer. Refill it. */ | |
46 | ||
47 | char *data = dirp->__data; | |
48 | int nentries; | |
49 | ||
50 | if (err = HURD_FD_PORT_USE (dirp->__fd, | |
51 | __dir_readdir (port, | |
52 | &data, &dirp->__size, | |
53 | dirp->__entry_ptr, | |
54 | -1, 0, &nentries))) | |
55 | { | |
56 | __hurd_fail (err); | |
57 | dp = NULL; | |
58 | break; | |
59 | } | |
60 | ||
61 | /* DATA now corresponds to entry index DIRP->__entry_ptr. */ | |
62 | dirp->__entry_data = dirp->__entry_ptr; | |
63 | ||
64 | if (data != dirp->__data) | |
65 | { | |
66 | /* The data was passed out of line, so our old buffer is no | |
67 | longer useful. Deallocate the old buffer and reset our | |
68 | information for the new buffer. */ | |
69 | __vm_deallocate (__mach_task_self (), | |
70 | (vm_address_t) dirp->__data, | |
71 | dirp->__allocation); | |
72 | dirp->__data = data; | |
73 | dirp->__allocation = round_page (dirp->__size); | |
74 | } | |
75 | ||
76 | /* Reset the pointer into the buffer. */ | |
77 | dirp->__ptr = dirp->__data; | |
78 | ||
79 | if (nentries == 0) | |
80 | { | |
81 | /* End of file. */ | |
82 | dp = NULL; | |
83 | break; | |
84 | } | |
85 | ||
86 | /* We trust the filesystem to return correct data and so we | |
87 | ignore NENTRIES. */ | |
88 | } | |
89 | ||
90 | dp = (struct dirent64 *) dirp->__ptr; | |
91 | dirp->__ptr += dp->d_reclen; | |
92 | ++dirp->__entry_ptr; | |
93 | ||
94 | /* Loop to ignore deleted files. */ | |
95 | } while (dp->d_fileno == 0); | |
96 | ||
97 | if (dp) | |
4c587216 | 98 | { |
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99 | *entry = *dp; |
100 | memcpy (entry->d_name, dp->d_name, dp->d_namlen + 1); | |
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101 | *result = entry; |
102 | } | |
103 | else | |
104 | *result = NULL; | |
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105 | |
106 | __libc_lock_unlock (dirp->__lock); | |
107 | ||
108 | return dp ? 0 : err ? errno : 0; | |
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109 | } |
110 | ||
1ab18a5b | 111 | weak_alias (__readdir64_r, readdir64_r) |