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. */
27int
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
110weak_alias (__readdir64_r, readdir64_r)
111

source code of glibc/sysdeps/mach/hurd/readdir64_r.c