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31 * @(#)dirent.h 8.3 (Berkeley) 8/10/94
35 #ifndef _SYS_DIRENT_H_
36 #define _SYS_DIRENT_H_
38 #include <sys/cdefs.h>
39 #include <sys/_types.h>
41 #ifndef _INO_T_DECLARED
42 typedef __ino_t ino_t;
43 #define _INO_T_DECLARED
46 #ifndef _OFF_T_DECLARED
47 typedef __off_t off_t;
48 #define _OFF_T_DECLARED
52 * The dirent structure defines the format of directory entries returned by
53 * the getdirentries(2) system call.
55 * A directory entry has a struct dirent at the front of it, containing its
56 * inode number, the length of the entry, and the length of the name
57 * contained in the entry. These are followed by the name padded to an 8
58 * byte boundary with null bytes. All names are guaranteed null terminated.
59 * The maximum length of a name in a directory is MAXNAMLEN.
61 * Explicit padding between the last member of the header (d_namlen) and
62 * d_name avoids ABI padding at the end of dirent on LP64 architectures.
63 * There is code depending on d_name being last.
67 ino_t d_fileno; /* file number of entry */
68 off_t d_off; /* directory offset of entry */
69 __uint16_t d_reclen; /* length of this record */
70 __uint8_t d_type; /* file type, see below */
72 __uint16_t d_namlen; /* length of string in d_name */
76 char d_name[MAXNAMLEN + 1]; /* name must be no longer than this */
78 char d_name[255 + 1]; /* name must be no longer than this */
82 #if defined(_WANT_FREEBSD11_DIRENT) || defined(_KERNEL)
83 struct freebsd11_dirent {
84 __uint32_t d_fileno; /* file number of entry */
85 __uint16_t d_reclen; /* length of this record */
86 __uint8_t d_type; /* file type, see below */
87 __uint8_t d_namlen; /* length of string in d_name */
88 char d_name[255 + 1]; /* name must be no longer than this */
90 #endif /* _WANT_FREEBSD11_DIRENT || _KERNEL */
108 * Convert between stat structure types and directory types.
110 #define IFTODT(mode) (((mode) & 0170000) >> 12)
111 #define DTTOIF(dirtype) ((dirtype) << 12)
114 * The _GENERIC_DIRSIZ macro gives the minimum record length which will hold
115 * the directory entry. This returns the amount of space in struct dirent
116 * without the d_name field, plus enough space for the name with a terminating
117 * null byte (dp->d_namlen+1), rounded up to a 8 byte boundary.
119 * XXX although this macro is in the implementation namespace, it requires
120 * a manifest constant that is not.
122 #define _GENERIC_DIRLEN(namlen) \
123 ((__offsetof(struct dirent, d_name) + (namlen) + 1 + 7) & ~7)
124 #define _GENERIC_DIRSIZ(dp) _GENERIC_DIRLEN((dp)->d_namlen)
125 #endif /* __BSD_VISIBLE */
128 #define GENERIC_DIRSIZ(dp) _GENERIC_DIRSIZ(dp)
131 * Ensure that padding bytes are zeroed and that the name is NUL-terminated.
134 dirent_terminate(struct dirent *dp)
139 memset(dp->d_name + dp->d_namlen, 0,
140 dp->d_reclen - (__offsetof(struct dirent, d_name) + dp->d_namlen));
144 #endif /* !_SYS_DIRENT_H_ */