1 // Filesystem declarations -*- C++ -*-
2
3 // Copyright (C) 2014-2021 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24
25 /** @file include/bits/fs_fwd.h
26 * This is an internal header file, included by other library headers.
27 * Do not attempt to use it directly. @headername{filesystem}
28 */
29
30 #ifndef _GLIBCXX_FS_FWD_H
31 #define _GLIBCXX_FS_FWD_H 1
32
33 #if __cplusplus >= 201703L
34
35 #include <system_error>
36 #include <cstdint>
37 #include <bits/chrono.h>
38
_GLIBCXX_VISIBILITY(default)39 namespace std _GLIBCXX_VISIBILITY(default)
40 {
41 _GLIBCXX_BEGIN_NAMESPACE_VERSION
42
43 /// ISO C++ 2017 namespace for File System library
44 namespace filesystem
45 {
46 #if _GLIBCXX_USE_CXX11_ABI
47 /// @cond undocumented
48 inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
49 /// @endcond
50 #endif
51
52 /** @addtogroup filesystem
53 * @{
54 */
55
56 class file_status;
57 _GLIBCXX_BEGIN_NAMESPACE_CXX11
58 class path;
59 class filesystem_error;
60 class directory_entry;
61 class directory_iterator;
62 class recursive_directory_iterator;
63 _GLIBCXX_END_NAMESPACE_CXX11
64
65 /// Information about free space on a disk
66 struct space_info
67 {
68 uintmax_t capacity;
69 uintmax_t free;
70 uintmax_t available;
71
72 #if __cpp_impl_three_way_comparison >= 201907L
73 friend bool operator==(const space_info&, const space_info&) = default;
74 #endif
75 };
76
77 /// Enumerated type representing the type of a file
78 enum class file_type : signed char {
79 none = 0, not_found = -1, regular = 1, directory = 2, symlink = 3,
80 block = 4, character = 5, fifo = 6, socket = 7, unknown = 8
81 };
82
83 /// Bitmask type controlling effects of `filesystem::copy`
84 enum class copy_options : unsigned short {
85 none = 0,
86 skip_existing = 1, overwrite_existing = 2, update_existing = 4,
87 recursive = 8,
88 copy_symlinks = 16, skip_symlinks = 32,
89 directories_only = 64, create_symlinks = 128, create_hard_links = 256
90 };
91
92 /// @{
93 /// @relates copy_options
94 constexpr copy_options
95 operator&(copy_options __x, copy_options __y) noexcept
96 {
97 using __utype = typename std::underlying_type<copy_options>::type;
98 return static_cast<copy_options>(
99 static_cast<__utype>(__x) & static_cast<__utype>(__y));
100 }
101
102 constexpr copy_options
103 operator|(copy_options __x, copy_options __y) noexcept
104 {
105 using __utype = typename std::underlying_type<copy_options>::type;
106 return static_cast<copy_options>(
107 static_cast<__utype>(__x) | static_cast<__utype>(__y));
108 }
109
110 constexpr copy_options
111 operator^(copy_options __x, copy_options __y) noexcept
112 {
113 using __utype = typename std::underlying_type<copy_options>::type;
114 return static_cast<copy_options>(
115 static_cast<__utype>(__x) ^ static_cast<__utype>(__y));
116 }
117
118 constexpr copy_options
119 operator~(copy_options __x) noexcept
120 {
121 using __utype = typename std::underlying_type<copy_options>::type;
122 return static_cast<copy_options>(~static_cast<__utype>(__x));
123 }
124
125 inline copy_options&
126 operator&=(copy_options& __x, copy_options __y) noexcept
127 { return __x = __x & __y; }
128
129 inline copy_options&
130 operator|=(copy_options& __x, copy_options __y) noexcept
131 { return __x = __x | __y; }
132
133 inline copy_options&
134 operator^=(copy_options& __x, copy_options __y) noexcept
135 { return __x = __x ^ __y; }
136 /// @}
137
138
139 /// Bitmask type representing file access permissions
140 enum class perms : unsigned {
141 none = 0,
142 owner_read = 0400,
143 owner_write = 0200,
144 owner_exec = 0100,
145 owner_all = 0700,
146 group_read = 040,
147 group_write = 020,
148 group_exec = 010,
149 group_all = 070,
150 others_read = 04,
151 others_write = 02,
152 others_exec = 01,
153 others_all = 07,
154 all = 0777,
155 set_uid = 04000,
156 set_gid = 02000,
157 sticky_bit = 01000,
158 mask = 07777,
159 unknown = 0xFFFF,
160 };
161
162 /// @{
163 /// @relates perm_options
164 constexpr perms
165 operator&(perms __x, perms __y) noexcept
166 {
167 using __utype = typename std::underlying_type<perms>::type;
168 return static_cast<perms>(
169 static_cast<__utype>(__x) & static_cast<__utype>(__y));
170 }
171
172 constexpr perms
173 operator|(perms __x, perms __y) noexcept
174 {
175 using __utype = typename std::underlying_type<perms>::type;
176 return static_cast<perms>(
177 static_cast<__utype>(__x) | static_cast<__utype>(__y));
178 }
179
180 constexpr perms
181 operator^(perms __x, perms __y) noexcept
182 {
183 using __utype = typename std::underlying_type<perms>::type;
184 return static_cast<perms>(
185 static_cast<__utype>(__x) ^ static_cast<__utype>(__y));
186 }
187
188 constexpr perms
189 operator~(perms __x) noexcept
190 {
191 using __utype = typename std::underlying_type<perms>::type;
192 return static_cast<perms>(~static_cast<__utype>(__x));
193 }
194
195 inline perms&
196 operator&=(perms& __x, perms __y) noexcept
197 { return __x = __x & __y; }
198
199 inline perms&
200 operator|=(perms& __x, perms __y) noexcept
201 { return __x = __x | __y; }
202
203 inline perms&
204 operator^=(perms& __x, perms __y) noexcept
205 { return __x = __x ^ __y; }
206 /// @}
207
208 /// Bitmask type controlling changes to permissions
209 enum class perm_options : unsigned {
210 replace = 0x1,
211 add = 0x2,
212 remove = 0x4,
213 nofollow = 0x8
214 };
215
216 /// @{
217 /// @relates perm_options
218 constexpr perm_options
219 operator&(perm_options __x, perm_options __y) noexcept
220 {
221 using __utype = typename std::underlying_type<perm_options>::type;
222 return static_cast<perm_options>(
223 static_cast<__utype>(__x) & static_cast<__utype>(__y));
224 }
225
226 constexpr perm_options
227 operator|(perm_options __x, perm_options __y) noexcept
228 {
229 using __utype = typename std::underlying_type<perm_options>::type;
230 return static_cast<perm_options>(
231 static_cast<__utype>(__x) | static_cast<__utype>(__y));
232 }
233
234 constexpr perm_options
235 operator^(perm_options __x, perm_options __y) noexcept
236 {
237 using __utype = typename std::underlying_type<perm_options>::type;
238 return static_cast<perm_options>(
239 static_cast<__utype>(__x) ^ static_cast<__utype>(__y));
240 }
241
242 constexpr perm_options
243 operator~(perm_options __x) noexcept
244 {
245 using __utype = typename std::underlying_type<perm_options>::type;
246 return static_cast<perm_options>(~static_cast<__utype>(__x));
247 }
248
249 inline perm_options&
250 operator&=(perm_options& __x, perm_options __y) noexcept
251 { return __x = __x & __y; }
252
253 inline perm_options&
254 operator|=(perm_options& __x, perm_options __y) noexcept
255 { return __x = __x | __y; }
256
257 inline perm_options&
258 operator^=(perm_options& __x, perm_options __y) noexcept
259 { return __x = __x ^ __y; }
260 /// @}
261
262 /// Bitmask type controlling directory iteration
263 enum class directory_options : unsigned char {
264 none = 0, follow_directory_symlink = 1, skip_permission_denied = 2
265 };
266
267 /// @{
268 /// @relates directory_options
269 constexpr directory_options
270 operator&(directory_options __x, directory_options __y) noexcept
271 {
272 using __utype = typename std::underlying_type<directory_options>::type;
273 return static_cast<directory_options>(
274 static_cast<__utype>(__x) & static_cast<__utype>(__y));
275 }
276
277 constexpr directory_options
278 operator|(directory_options __x, directory_options __y) noexcept
279 {
280 using __utype = typename std::underlying_type<directory_options>::type;
281 return static_cast<directory_options>(
282 static_cast<__utype>(__x) | static_cast<__utype>(__y));
283 }
284
285 constexpr directory_options
286 operator^(directory_options __x, directory_options __y) noexcept
287 {
288 using __utype = typename std::underlying_type<directory_options>::type;
289 return static_cast<directory_options>(
290 static_cast<__utype>(__x) ^ static_cast<__utype>(__y));
291 }
292
293 constexpr directory_options
294 operator~(directory_options __x) noexcept
295 {
296 using __utype = typename std::underlying_type<directory_options>::type;
297 return static_cast<directory_options>(~static_cast<__utype>(__x));
298 }
299
300 inline directory_options&
301 operator&=(directory_options& __x, directory_options __y) noexcept
302 { return __x = __x & __y; }
303
304 inline directory_options&
305 operator|=(directory_options& __x, directory_options __y) noexcept
306 { return __x = __x | __y; }
307
308 inline directory_options&
309 operator^=(directory_options& __x, directory_options __y) noexcept
310 { return __x = __x ^ __y; }
311 /// @}
312
313 /// The type used for file timestamps
314 using file_time_type = __file_clock::time_point;
315
316 // operational functions
317
318 void copy(const path& __from, const path& __to, copy_options __options);
319 void copy(const path& __from, const path& __to, copy_options __options,
320 error_code&);
321
322 bool copy_file(const path& __from, const path& __to, copy_options __option);
323 bool copy_file(const path& __from, const path& __to, copy_options __option,
324 error_code&);
325
326 path current_path();
327
328 bool exists(file_status) noexcept;
329
330 bool is_other(file_status) noexcept;
331
332 uintmax_t file_size(const path&);
333 uintmax_t file_size(const path&, error_code&) noexcept;
334 uintmax_t hard_link_count(const path&);
335 uintmax_t hard_link_count(const path&, error_code&) noexcept;
336 file_time_type last_write_time(const path&);
337 file_time_type last_write_time(const path&, error_code&) noexcept;
338
339 void permissions(const path&, perms, perm_options, error_code&) noexcept;
340
341 path proximate(const path& __p, const path& __base, error_code& __ec);
342 path proximate(const path& __p, const path& __base, error_code& __ec);
343
344 path relative(const path& __p, const path& __base, error_code& __ec);
345
346 file_status status(const path&);
347 file_status status(const path&, error_code&) noexcept;
348
349 bool status_known(file_status) noexcept;
350
351 file_status symlink_status(const path&);
352 file_status symlink_status(const path&, error_code&) noexcept;
353
354 bool is_regular_file(file_status) noexcept;
355 bool is_symlink(file_status) noexcept;
356
357 /// @}
358 } // namespace filesystem
359 _GLIBCXX_END_NAMESPACE_VERSION
360 } // namespace std
361 #endif // C++17
362 #endif // _GLIBCXX_FS_FWD_H
363