1 /* Copyright (C) 2001-2021 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
__readdir64_r(DIR * dirp,struct dirent64 * entry,struct dirent64 ** result)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 {
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)
98 {
99 *entry = *dp;
100 memcpy (entry->d_name, dp->d_name, dp->d_namlen + 1);
101 *result = entry;
102 }
103 else
104 *result = NULL;
105
106 __libc_lock_unlock (dirp->__lock);
107
108 return dp ? 0 : err ? errno : 0;
109 }
110
111 weak_alias (__readdir64_r, readdir64_r)
112