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 <hurd.h>
21#include <hurd/fs.h>
22#include <hurd/fd.h>
23#include "dirstream.h"
24
25/* Read a directory entry from DIRP. */
26struct dirent64 *
27__readdir64 (DIR *dirp)
28{
29 struct dirent64 *dp;
30
31 if (dirp == NULL)
32 return __hurd_fail (EINVAL), NULL;
33
34 __libc_lock_lock (dirp->__lock);
35
36 do
37 {
38 if (dirp->__ptr - dirp->__data >= dirp->__size)
39 {
40 /* We've emptied out our buffer. Refill it. */
41
42 char *data = dirp->__data;
43 mach_msg_type_number_t data_size = dirp->__size;
44 int nentries;
45 error_t err;
46
47 if (err = HURD_FD_PORT_USE (dirp->__fd,
48 __dir_readdir (port,
49 &data, &data_size,
50 dirp->__entry_ptr,
51 -1, 0, &nentries)))
52 {
53 __hurd_fail (err);
54 dp = NULL;
55 break;
56 }
57
58 dirp->__size = data_size;
59 /* DATA now corresponds to entry index DIRP->__entry_ptr. */
60 dirp->__entry_data = dirp->__entry_ptr;
61
62 if (data != dirp->__data)
63 {
64 /* The data was passed out of line, so our old buffer is no
65 longer useful. Deallocate the old buffer and reset our
66 information for the new buffer. */
67 if (dirp->__data != NULL)
68 {
69 err = __vm_deallocate (__mach_task_self (),
70 (vm_address_t) dirp->__data,
71 dirp->__allocation);
72 assert_perror (err);
73 }
74 dirp->__data = data;
75 dirp->__allocation = round_page (dirp->__size);
76 }
77
78 /* Reset the pointer into the buffer. */
79 dirp->__ptr = dirp->__data;
80
81 if (nentries == 0)
82 {
83 /* End of file. */
84 dp = NULL;
85 break;
86 }
87
88 /* We trust the filesystem to return correct data and so we
89 ignore NENTRIES. */
90 }
91
92 dp = (struct dirent64 *) dirp->__ptr;
93 dirp->__ptr += dp->d_reclen;
94 ++dirp->__entry_ptr;
95
96 /* Loop to ignore deleted files. */
97 } while (dp->d_fileno == 0);
98
99 __libc_lock_unlock (dirp->__lock);
100
101 return dp;
102}
103
104libc_hidden_def (__readdir64)
105weak_alias (__readdir64, readdir64)
106

source code of glibc/sysdeps/mach/hurd/readdir64.c