1/* Copyright (C) 1993-2022 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 <errno.h>
19#include <limits.h>
20#include <stddef.h>
21#include <stdlib.h>
22#include <string.h>
23#include <dirent.h>
24#include <fcntl.h>
25#include <sys/types.h>
26#include <sys/stat.h>
27#include <unistd.h>
28#include <stdio.h>
29#include <hurd.h>
30#include <hurd/fd.h>
31#include <not-cancel.h>
32#include "dirstream.h"
33
34
35/* Open a directory stream on a file descriptor in Hurd internal form.
36 We do no checking here on the descriptor. */
37DIR *
38_hurd_fd_opendir (struct hurd_fd *d)
39{
40 DIR *dirp;
41
42 if (d == NULL)
43 {
44 errno = EBADF;
45 return NULL;
46 }
47
48 dirp = (DIR *) malloc (size: sizeof (DIR));
49 if (dirp == NULL)
50 return NULL;
51
52 /* Set the descriptor to close on exec. */
53 HURD_CRITICAL_BEGIN;
54 __spin_lock (&d->port.lock);
55 d->flags |= FD_CLOEXEC;
56 __spin_unlock (&d->port.lock);
57 HURD_CRITICAL_END;
58
59 dirp->__fd = d;
60 dirp->__data = dirp->__ptr = NULL;
61 dirp->__entry_data = dirp->__entry_ptr = 0;
62 dirp->__allocation = 0;
63 dirp->__size = 0;
64
65 __libc_lock_init (dirp->__lock);
66
67 return dirp;
68}
69
70
71DIR *
72__opendirat (int dfd, const char *name)
73{
74 if (name[0] == '\0')
75 {
76 /* POSIX.1-1990 says an empty name gets ENOENT;
77 but `open' might like it fine. */
78 __set_errno (ENOENT);
79 return NULL;
80 }
81
82 int flags = O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC;
83 int fd;
84#if IS_IN (rtld)
85 assert (dfd == AT_FDCWD);
86 fd = __open_nocancel (name, flags);
87#else
88 fd = __openat_nocancel (dfd, name, flags);
89#endif
90 if (fd < 0)
91 return NULL;
92
93 /* Extract the pointer to the descriptor structure. */
94 DIR *dirp = _hurd_fd_opendir (d: _hurd_fd_get (fd));
95 if (dirp == NULL)
96 __close (fd);
97
98 return dirp;
99}
100
101
102/* Open a directory stream on NAME. */
103DIR *
104__opendir (const char *name)
105{
106#if 0 /* TODO. */
107 return __opendirat (AT_FDCWD, name);
108#else
109 if (name[0] == '\0')
110 {
111 /* POSIX.1-1990 says an empty name gets ENOENT;
112 but `open' might like it fine. */
113 __set_errno (ENOENT);
114 return NULL;
115 }
116
117 int fd = __open (name, O_RDONLY | O_NONBLOCK | O_DIRECTORY);
118 if (fd < 0)
119 return NULL;
120
121 /* Extract the pointer to the descriptor structure. */
122 DIR *dirp = _hurd_fd_opendir (d: _hurd_fd_get (fd));
123 if (dirp == NULL)
124 __close (fd);
125
126 return dirp;
127#endif
128}
129weak_alias (__opendir, opendir)
130

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