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[glibc.git] / dirent / dirent.h
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1 /* Copyright (C) 1991-2000, 2003, 2004, 2005 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
20 * POSIX Standard: 5.1.2 Directory Operations <dirent.h>
23 #ifndef _DIRENT_H
24 #define _DIRENT_H 1
26 #include <features.h>
28 __BEGIN_DECLS
30 #include <bits/types.h>
32 #ifdef __USE_XOPEN
33 # ifndef __ino_t_defined
34 # ifndef __USE_FILE_OFFSET64
35 typedef __ino_t ino_t;
36 # else
37 typedef __ino64_t ino_t;
38 # endif
39 # define __ino_t_defined
40 # endif
41 # if defined __USE_LARGEFILE64 && !defined __ino64_t_defined
42 typedef __ino64_t ino64_t;
43 # define __ino64_t_defined
44 # endif
45 #endif
47 /* This file defines `struct dirent'.
49 It defines the macro `_DIRENT_HAVE_D_NAMLEN' iff there is a `d_namlen'
50 member that gives the length of `d_name'.
52 It defines the macro `_DIRENT_HAVE_D_RECLEN' iff there is a `d_reclen'
53 member that gives the size of the entire directory entry.
55 It defines the macro `_DIRENT_HAVE_D_OFF' iff there is a `d_off'
56 member that gives the file offset of the next directory entry.
58 It defines the macro `_DIRENT_HAVE_D_TYPE' iff there is a `d_type'
59 member that gives the type of the file.
62 #include <bits/dirent.h>
64 #if (defined __USE_BSD || defined __USE_MISC) && !defined d_fileno
65 # define d_ino d_fileno /* Backward compatibility. */
66 #endif
68 /* These macros extract size information from a `struct dirent *'.
69 They may evaluate their argument multiple times, so it must not
70 have side effects. Each of these may involve a relatively costly
71 call to `strlen' on some systems, so these values should be cached.
73 _D_EXACT_NAMLEN (DP) returns the length of DP->d_name, not including
74 its terminating null character.
76 _D_ALLOC_NAMLEN (DP) returns a size at least (_D_EXACT_NAMLEN (DP) + 1);
77 that is, the allocation size needed to hold the DP->d_name string.
78 Use this macro when you don't need the exact length, just an upper bound.
79 This macro is less likely to require calling `strlen' than _D_EXACT_NAMLEN.
82 #ifdef _DIRENT_HAVE_D_NAMLEN
83 # define _D_EXACT_NAMLEN(d) ((d)->d_namlen)
84 # define _D_ALLOC_NAMLEN(d) (_D_EXACT_NAMLEN (d) + 1)
85 #else
86 # define _D_EXACT_NAMLEN(d) (strlen ((d)->d_name))
87 # ifdef _DIRENT_HAVE_D_RECLEN
88 # define _D_ALLOC_NAMLEN(d) (((char *) (d) + (d)->d_reclen) - &(d)->d_name[0])
89 # else
90 # define _D_ALLOC_NAMLEN(d) (sizeof (d)->d_name > 1 ? sizeof (d)->d_name : \
91 _D_EXACT_NAMLEN (d) + 1)
92 # endif
93 #endif
96 #ifdef __USE_BSD
97 /* File types for `d_type'. */
98 enum
100 DT_UNKNOWN = 0,
101 # define DT_UNKNOWN DT_UNKNOWN
102 DT_FIFO = 1,
103 # define DT_FIFO DT_FIFO
104 DT_CHR = 2,
105 # define DT_CHR DT_CHR
106 DT_DIR = 4,
107 # define DT_DIR DT_DIR
108 DT_BLK = 6,
109 # define DT_BLK DT_BLK
110 DT_REG = 8,
111 # define DT_REG DT_REG
112 DT_LNK = 10,
113 # define DT_LNK DT_LNK
114 DT_SOCK = 12,
115 # define DT_SOCK DT_SOCK
116 DT_WHT = 14
117 # define DT_WHT DT_WHT
120 /* Convert between stat structure types and directory types. */
121 # define IFTODT(mode) (((mode) & 0170000) >> 12)
122 # define DTTOIF(dirtype) ((dirtype) << 12)
123 #endif
126 /* This is the data type of directory stream objects.
127 The actual structure is opaque to users. */
128 typedef struct __dirstream DIR;
130 /* Open a directory stream on NAME.
131 Return a DIR stream on the directory, or NULL if it could not be opened.
133 This function is a possible cancellation point and therefore not
134 marked with __THROW. */
135 extern DIR *opendir (__const char *__name) __nonnull ((1));
137 #ifdef __USE_GNU
138 /* Same as opendir, but open the stream on the file descriptor FD.
140 This function is a possible cancellation point and therefore not
141 marked with __THROW. */
142 extern DIR *fdopendir (int __fd);
143 #endif
145 /* Close the directory stream DIRP.
146 Return 0 if successful, -1 if not.
148 This function is a possible cancellation point and therefore not
149 marked with __THROW. */
150 extern int closedir (DIR *__dirp) __nonnull ((1));
152 /* Read a directory entry from DIRP. Return a pointer to a `struct
153 dirent' describing the entry, or NULL for EOF or error. The
154 storage returned may be overwritten by a later readdir call on the
155 same DIR stream.
157 If the Large File Support API is selected we have to use the
158 appropriate interface.
160 This function is a possible cancellation point and therefore not
161 marked with __THROW. */
162 #ifndef __USE_FILE_OFFSET64
163 extern struct dirent *readdir (DIR *__dirp) __nonnull ((1));
164 #else
165 # ifdef __REDIRECT
166 extern struct dirent *__REDIRECT (readdir, (DIR *__dirp), readdir64)
167 __nonnull ((1));
168 # else
169 # define readdir readdir64
170 # endif
171 #endif
173 #ifdef __USE_LARGEFILE64
174 extern struct dirent64 *readdir64 (DIR *__dirp) __nonnull ((1));
175 #endif
177 #if defined __USE_POSIX || defined __USE_MISC
178 /* Reentrant version of `readdir'. Return in RESULT a pointer to the
179 next entry.
181 This function is a possible cancellation point and therefore not
182 marked with __THROW. */
183 # ifndef __USE_FILE_OFFSET64
184 extern int readdir_r (DIR *__restrict __dirp,
185 struct dirent *__restrict __entry,
186 struct dirent **__restrict __result)
187 __nonnull ((1, 2, 3));
188 # else
189 # ifdef __REDIRECT
190 extern int __REDIRECT (readdir_r,
191 (DIR *__restrict __dirp,
192 struct dirent *__restrict __entry,
193 struct dirent **__restrict __result),
194 readdir64_r) __nonnull ((1, 2, 3));
195 # else
196 # define readdir_r readdir64_r
197 # endif
198 # endif
200 # ifdef __USE_LARGEFILE64
201 extern int readdir64_r (DIR *__restrict __dirp,
202 struct dirent64 *__restrict __entry,
203 struct dirent64 **__restrict __result)
204 __nonnull ((1, 2, 3));
205 # endif
206 #endif /* POSIX or misc */
208 /* Rewind DIRP to the beginning of the directory. */
209 extern void rewinddir (DIR *__dirp) __THROW __nonnull ((1));
211 #if defined __USE_BSD || defined __USE_MISC || defined __USE_XOPEN
212 # include <bits/types.h>
214 /* Seek to position POS on DIRP. */
215 extern void seekdir (DIR *__dirp, long int __pos) __THROW __nonnull ((1));
217 /* Return the current position of DIRP. */
218 extern long int telldir (DIR *__dirp) __THROW __nonnull ((1));
219 #endif
221 #if defined __USE_BSD || defined __USE_MISC
223 /* Return the file descriptor used by DIRP. */
224 extern int dirfd (DIR *__dirp) __THROW __nonnull ((1));
226 # if defined __OPTIMIZE__ && defined _DIR_dirfd
227 # define dirfd(dirp) _DIR_dirfd (dirp)
228 # endif
230 # ifndef MAXNAMLEN
231 /* Get the definitions of the POSIX.1 limits. */
232 # include <bits/posix1_lim.h>
234 /* `MAXNAMLEN' is the BSD name for what POSIX calls `NAME_MAX'. */
235 # ifdef NAME_MAX
236 # define MAXNAMLEN NAME_MAX
237 # else
238 # define MAXNAMLEN 255
239 # endif
240 # endif
242 # define __need_size_t
243 # include <stddef.h>
245 /* Scan the directory DIR, calling SELECTOR on each directory entry.
246 Entries for which SELECT returns nonzero are individually malloc'd,
247 sorted using qsort with CMP, and collected in a malloc'd array in
248 *NAMELIST. Returns the number of entries selected, or -1 on error. */
249 # ifndef __USE_FILE_OFFSET64
250 extern int scandir (__const char *__restrict __dir,
251 struct dirent ***__restrict __namelist,
252 int (*__selector) (__const struct dirent *),
253 int (*__cmp) (__const void *, __const void *))
254 __nonnull ((1, 2));
255 # else
256 # ifdef __REDIRECT
257 extern int __REDIRECT (scandir,
258 (__const char *__restrict __dir,
259 struct dirent ***__restrict __namelist,
260 int (*__selector) (__const struct dirent *),
261 int (*__cmp) (__const void *, __const void *)),
262 scandir64) __nonnull ((1, 2));
263 # else
264 # define scandir scandir64
265 # endif
266 # endif
268 # if defined __USE_GNU && defined __USE_LARGEFILE64
269 /* This function is like `scandir' but it uses the 64bit dirent structure.
270 Please note that the CMP function must now work with struct dirent64 **. */
271 extern int scandir64 (__const char *__restrict __dir,
272 struct dirent64 ***__restrict __namelist,
273 int (*__selector) (__const struct dirent64 *),
274 int (*__cmp) (__const void *, __const void *))
275 __nonnull ((1, 2));
276 # endif
278 /* Function to compare two `struct dirent's alphabetically. */
279 # ifndef __USE_FILE_OFFSET64
280 extern int alphasort (__const void *__e1, __const void *__e2)
281 __THROW __attribute_pure__ __nonnull ((1, 2));
282 # else
283 # ifdef __REDIRECT
284 extern int __REDIRECT_NTH (alphasort,
285 (__const void *__e1, __const void *__e2),
286 alphasort64) __attribute_pure__ __nonnull ((1, 2));
287 # else
288 # define alphasort alphasort64
289 # endif
290 # endif
292 # if defined __USE_GNU && defined __USE_LARGEFILE64
293 extern int alphasort64 (__const void *__e1, __const void *__e2)
294 __THROW __attribute_pure__ __nonnull ((1, 2));
295 # endif
297 # ifdef __USE_GNU
298 /* Function to compare two `struct dirent's by name & version. */
299 # ifndef __USE_FILE_OFFSET64
300 extern int versionsort (__const void *__e1, __const void *__e2)
301 __THROW __attribute_pure__ __nonnull ((1, 2));
302 # else
303 # ifdef __REDIRECT
304 extern int __REDIRECT_NTH (versionsort,
305 (__const void *__e1, __const void *__e2),
306 versionsort64)
307 __attribute_pure__ __nonnull ((1, 2));
308 # else
309 # define versionsort versionsort64
310 # endif
311 # endif
313 # ifdef __USE_LARGEFILE64
314 extern int versionsort64 (__const void *__e1, __const void *__e2)
315 __THROW __attribute_pure__ __nonnull ((1, 2));
316 # endif
317 # endif
319 /* Read directory entries from FD into BUF, reading at most NBYTES.
320 Reading starts at offset *BASEP, and *BASEP is updated with the new
321 position after reading. Returns the number of bytes read; zero when at
322 end of directory; or -1 for errors. */
323 # ifndef __USE_FILE_OFFSET64
324 extern __ssize_t getdirentries (int __fd, char *__restrict __buf,
325 size_t __nbytes,
326 __off_t *__restrict __basep)
327 __THROW __nonnull ((2, 4));
328 # else
329 # ifdef __REDIRECT
330 extern __ssize_t __REDIRECT_NTH (getdirentries,
331 (int __fd, char *__restrict __buf,
332 size_t __nbytes,
333 __off64_t *__restrict __basep),
334 getdirentries64) __nonnull ((2, 4));
335 # else
336 # define getdirentries getdirentries64
337 # endif
338 # endif
340 # ifdef __USE_LARGEFILE64
341 extern __ssize_t getdirentries64 (int __fd, char *__restrict __buf,
342 size_t __nbytes,
343 __off64_t *__restrict __basep)
344 __THROW __nonnull ((2, 4));
345 # endif
347 #endif /* Use BSD or misc. */
349 __END_DECLS
351 #endif /* dirent.h */