1 /* Copyright (C) 1991,92,93,94,95,96,97,98,2000 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 Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
20 * POSIX Standard: 5.1.2 Directory Operations <dirent.h>
30 #include <bits/types.h>
34 # ifndef __USE_FILE_OFFSET64
35 typedef __ino_t ino_t;
37 typedef __ino64_t ino_t;
41 # if defined __USE_LARGEFILE64 && !defined ino64_t
42 typedef __ino64_t ino64_t;
43 # define ino64_t ino64_t
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
118 /* Convert between stat structure types and directory types. */
119 # define IFTODT(mode) (((mode) & 0170000) >> 12)
120 # define DTTOIF(dirtype) ((dirtype) << 12)
124 /* This is the data type of directory stream objects.
125 The actual structure is opaque to users. */
126 typedef struct __dirstream DIR;
128 /* Open a directory stream on NAME.
129 Return a DIR stream on the directory, or NULL if it could not be opened. */
130 extern DIR *opendir __P ((__const char *__name));
132 /* Close the directory stream DIRP.
133 Return 0 if successful, -1 if not. */
134 extern int closedir __P ((DIR *__dirp));
136 /* Read a directory entry from DIRP. Return a pointer to a `struct
137 dirent' describing the entry, or NULL for EOF or error. The
138 storage returned may be overwritten by a later readdir call on the
141 If the Large File Support API is selected we have to use the
142 appropriate interface. */
143 #ifndef __USE_FILE_OFFSET64
144 extern struct dirent *readdir __P ((DIR *__dirp));
147 extern struct dirent *__REDIRECT (readdir, __P ((DIR *__dirp)), readdir64);
149 # define readdir readdir64
153 #ifdef __USE_LARGEFILE64
154 extern struct dirent64 *readdir64 __P ((DIR *__dirp));
157 #if defined __USE_POSIX || defined __USE_MISC
158 /* Reentrant version of `readdir'. Return in RESULT a pointer to the
160 # ifndef __USE_FILE_OFFSET64
161 extern int readdir_r __P ((DIR *__restrict __dirp,
162 struct dirent *__restrict __entry,
163 struct dirent **__restrict __result));
166 extern int __REDIRECT (readdir_r, __P ((DIR *__restrict __dirp,
167 struct dirent *__restrict __entry,
168 struct dirent **__restrict __result)),
171 # define readdir_r readdir64_r
175 # ifdef __USE_LARGEFILE64
176 extern int readdir64_r __P ((DIR *__restrict __dirp,
177 struct dirent64 *__restrict __entry,
178 struct dirent64 **__restrict __result));
180 #endif /* POSIX or misc */
182 /* Rewind DIRP to the beginning of the directory. */
183 extern void rewinddir __P ((DIR *__dirp));
185 #if defined __USE_BSD || defined __USE_MISC || defined __USE_XOPEN
186 # include <bits/types.h>
188 /* Seek to position POS on DIRP. */
189 extern void seekdir __P ((DIR *__dirp, long int __pos));
191 /* Return the current position of DIRP. */
192 extern long int telldir __P ((DIR *__dirp));
195 #if defined __USE_BSD || defined __USE_MISC
197 /* Return the file descriptor used by DIRP. */
198 extern int dirfd __P ((DIR *__dirp));
200 # if defined __OPTIMIZE__ && defined _DIR_dirfd
201 # define dirfd(dirp) _DIR_dirfd (dirp)
205 /* Get the definitions of the POSIX.1 limits. */
206 # include <bits/posix1_lim.h>
208 /* `MAXNAMLEN' is the BSD name for what POSIX calls `NAME_MAX'. */
210 # define MAXNAMLEN NAME_MAX
212 # define MAXNAMLEN 255
216 # define __need_size_t
219 /* Scan the directory DIR, calling SELECTOR on each directory entry.
220 Entries for which SELECT returns nonzero are individually malloc'd,
221 sorted using qsort with CMP, and collected in a malloc'd array in
222 *NAMELIST. Returns the number of entries selected, or -1 on error. */
223 # ifndef __USE_FILE_OFFSET64
224 extern int scandir __P ((__const char *__restrict __dir,
225 struct dirent ***__restrict __namelist,
226 int (*__selector) (__const struct dirent *),
227 int (*__cmp) (__const __ptr_t, __const __ptr_t)));
230 extern int __REDIRECT (scandir,
231 __P ((__const char *__restrict __dir,
232 struct dirent ***__restrict __namelist,
233 int (*__selector) (__const struct dirent *),
234 int (*__cmp) (__const __ptr_t, __const __ptr_t))),
237 # define scandir scandir64
241 # if defined __USE_GNU && defined __USE_LARGEFILE64
242 /* This function is like `scandir' but it uses the 64bit dirent structure.
243 Please note that the CMP function must now work with struct dirent64 **. */
244 extern int scandir64 __P ((__const char *__restrict __dir,
245 struct dirent64 ***__restrict __namelist,
246 int (*__selector) (__const struct dirent64 *),
247 int (*__cmp) (__const __ptr_t, __const __ptr_t)));
250 /* Function to compare two `struct dirent's alphabetically. */
251 # ifndef __USE_FILE_OFFSET64
252 extern int alphasort __P ((__const __ptr_t __e1, __const __ptr_t __e2));
255 extern int __REDIRECT (alphasort,
256 __P ((__const __ptr_t __e1, __const __ptr_t __e2)),
259 # define alphasort alphasort64
263 # if defined __USE_GNU && defined __USE_LARGEFILE64
264 extern int alphasort64 __P ((__const __ptr_t __e1, __const __ptr_t __e2));
268 /* Function to compare two `struct dirent's by name & version. */
269 # ifndef __USE_FILE_OFFSET64
270 extern int versionsort __P ((__const __ptr_t __e1, __const __ptr_t __e2));
273 extern int __REDIRECT (versionsort,
274 __P ((__const __ptr_t __e1, __const __ptr_t __e2)),
277 # define versionsort versionsort64
281 # ifdef __USE_LARGEFILE64
282 extern int versionsort64 __P ((__const __ptr_t __e1, __const __ptr_t __e2));
286 /* Read directory entries from FD into BUF, reading at most NBYTES.
287 Reading starts at offset *BASEP, and *BASEP is updated with the new
288 position after reading. Returns the number of bytes read; zero when at
289 end of directory; or -1 for errors. */
291 # ifndef __USE_FILE_OFFSET64
292 extern __ssize_t getdirentries __P ((int __fd, char *__restrict __buf,
294 __off_t *__restrict __basep));
297 extern __ssize_t __REDIRECT (getdirentries,
298 __P ((int __fd, char *__restrict __buf,
300 __off64_t *__restrict __basep)),
303 # define getdirentries getdirentries64
307 # ifdef __USE_LARGEFILE64
308 extern __ssize_t getdirentries64 __P ((int __fd, char *__restrict __buf,
310 __off64_t *__restrict __basep));
313 #endif /* Use BSD or misc. */
317 #endif /* dirent.h */