1 /* Copyright (C) 1991-2000, 2003, 2004 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
20 * POSIX Standard: 5.1.2 Directory Operations <dirent.h>
30 #include <bits/types.h>
33 # ifndef __ino_t_defined
34 # ifndef __USE_FILE_OFFSET64
35 typedef __ino_t ino_t;
37 typedef __ino64_t ino_t;
39 # define __ino_t_defined
41 # if defined __USE_LARGEFILE64 && !defined __ino64_t_defined
42 typedef __ino64_t ino64_t;
43 # define __ino64_t_defined
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. */
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)
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])
90 # define _D_ALLOC_NAMLEN(d) (sizeof (d)->d_name > 1 ? sizeof (d)->d_name : \
91 _D_EXACT_NAMLEN (d) + 1)
97 /* File types for `d_type'. */
101 # define DT_UNKNOWN DT_UNKNOWN
103 # define DT_FIFO DT_FIFO
105 # define DT_CHR DT_CHR
107 # define DT_DIR DT_DIR
109 # define DT_BLK DT_BLK
111 # define DT_REG DT_REG
113 # define DT_LNK DT_LNK
115 # define DT_SOCK DT_SOCK
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)
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));
136 libc_hidden_proto(opendir)
138 /* Close the directory stream DIRP.
139 Return 0 if successful, -1 if not.
141 This function is a possible cancellation point and therefore not
142 marked with __THROW. */
143 extern int closedir (DIR *__dirp) __nonnull ((1));
144 libc_hidden_proto(closedir)
146 /* Read a directory entry from DIRP. Return a pointer to a `struct
147 dirent' describing the entry, or NULL for EOF or error. The
148 storage returned may be overwritten by a later readdir call on the
151 If the Large File Support API is selected we have to use the
152 appropriate interface.
154 This function is a possible cancellation point and therefore not
155 marked with __THROW. */
156 #ifndef __USE_FILE_OFFSET64
157 extern struct dirent *readdir (DIR *__dirp) __nonnull ((1));
158 libc_hidden_proto(readdir)
161 extern struct dirent *__REDIRECT (readdir, (DIR *__dirp), readdir64)
164 # define readdir readdir64
168 #ifdef __USE_LARGEFILE64
169 extern struct dirent64 *readdir64 (DIR *__dirp) __nonnull ((1));
170 libc_hidden_proto(readdir64)
173 #if defined __USE_POSIX || defined __USE_MISC
174 /* Reentrant version of `readdir'. Return in RESULT a pointer to the
177 This function is a possible cancellation point and therefore not
178 marked with __THROW. */
179 # ifndef __USE_FILE_OFFSET64
180 extern int readdir_r (DIR *__restrict __dirp,
181 struct dirent *__restrict __entry,
182 struct dirent **__restrict __result)
183 __nonnull ((1, 2, 3));
184 libc_hidden_proto(readdir_r)
187 extern int __REDIRECT (readdir_r,
188 (DIR *__restrict __dirp,
189 struct dirent *__restrict __entry,
190 struct dirent **__restrict __result),
191 readdir64_r) __nonnull ((1, 2, 3));
193 # define readdir_r readdir64_r
197 # ifdef __USE_LARGEFILE64
198 extern int readdir64_r (DIR *__restrict __dirp,
199 struct dirent64 *__restrict __entry,
200 struct dirent64 **__restrict __result)
201 __nonnull ((1, 2, 3));
202 libc_hidden_proto(readdir64_r)
204 #endif /* POSIX or misc */
206 /* Rewind DIRP to the beginning of the directory. */
207 extern void rewinddir (DIR *__dirp) __THROW __nonnull ((1));
209 #if defined __USE_BSD || defined __USE_MISC || defined __USE_XOPEN
210 # include <bits/types.h>
212 /* Seek to position POS on DIRP. */
213 extern void seekdir (DIR *__dirp, long int __pos) __THROW __nonnull ((1));
215 /* Return the current position of DIRP. */
216 extern long int telldir (DIR *__dirp) __THROW __nonnull ((1));
219 #if defined __USE_BSD || defined __USE_MISC
221 /* Return the file descriptor used by DIRP. */
222 extern int dirfd (DIR *__dirp) __THROW __nonnull ((1));
223 libc_hidden_proto(dirfd)
225 # if 0 /* defined __OPTIMIZE__ && defined _DIR_dirfd */
226 # define dirfd(dirp) _DIR_dirfd (dirp)
230 /* Get the definitions of the POSIX.1 limits. */
231 # include <bits/posix1_lim.h>
233 /* `MAXNAMLEN' is the BSD name for what POSIX calls `NAME_MAX'. */
235 # define MAXNAMLEN NAME_MAX
237 # define MAXNAMLEN 255
241 # define __need_size_t
244 /* Scan the directory DIR, calling SELECTOR on each directory entry.
245 Entries for which SELECT returns nonzero are individually malloc'd,
246 sorted using qsort with CMP, and collected in a malloc'd array in
247 *NAMELIST. Returns the number of entries selected, or -1 on error. */
248 # ifndef __USE_FILE_OFFSET64
249 extern int scandir (__const char *__restrict __dir,
250 struct dirent ***__restrict __namelist,
251 int (*__selector) (__const struct dirent *),
252 int (*__cmp) (__const void *, __const void *))
256 extern int __REDIRECT (scandir,
257 (__const char *__restrict __dir,
258 struct dirent ***__restrict __namelist,
259 int (*__selector) (__const struct dirent *),
260 int (*__cmp) (__const void *, __const void *)),
261 scandir64) __nonnull ((1, 2));
263 # define scandir scandir64
267 # if defined __USE_GNU && defined __USE_LARGEFILE64
268 /* This function is like `scandir' but it uses the 64bit dirent structure.
269 Please note that the CMP function must now work with struct dirent64 **. */
270 extern int scandir64 (__const char *__restrict __dir,
271 struct dirent64 ***__restrict __namelist,
272 int (*__selector) (__const struct dirent64 *),
273 int (*__cmp) (__const void *, __const void *))
277 /* Function to compare two `struct dirent's alphabetically. */
278 # ifndef __USE_FILE_OFFSET64
279 extern int alphasort (__const void *__e1, __const void *__e2)
280 __THROW __attribute_pure__ __nonnull ((1, 2));
283 extern int __REDIRECT (alphasort,
284 (__const void *__e1, __const void *__e2),
285 alphasort64) __attribute_pure__ __nonnull ((1, 2));
287 # define alphasort alphasort64
291 # if defined __USE_GNU && defined __USE_LARGEFILE64
292 extern int alphasort64 (__const void *__e1, __const void *__e2)
293 __THROW __attribute_pure__ __nonnull ((1, 2));
296 /* Function to compare two `struct dirent's alphabetically. */
297 # ifndef __USE_FILE_OFFSET64
298 extern int versionsort (__const void *__e1, __const void *__e2)
299 __THROW __attribute_pure__ __nonnull ((1, 2));
302 extern int __REDIRECT (versionsort,
303 (__const void *__e1, __const void *__e2),
304 versionsort64) __attribute_pure__ __nonnull ((1, 2));
306 # define versionsort versionsort64
310 # if defined __USE_GNU && defined __USE_LARGEFILE64
311 extern int versionsort64 (__const void *__e1, __const void *__e2)
312 __THROW __attribute_pure__ __nonnull ((1, 2));
315 #endif /* Use BSD or misc. */
319 #endif /* dirent.h */