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32 #ifndef _SYS_DIRENT_H_
33 #define _SYS_DIRENT_H_
35 #include <sys/cdefs.h>
36 #include <sys/_types.h>
38 #ifndef _INO_T_DECLARED
39 typedef __ino_t ino_t;
40 #define _INO_T_DECLARED
43 #ifndef _OFF_T_DECLARED
44 typedef __off_t off_t;
45 #define _OFF_T_DECLARED
49 * The dirent structure defines the format of directory entries returned by
50 * the getdirentries(2) system call.
52 * A directory entry has a struct dirent at the front of it, containing its
53 * inode number, the length of the entry, and the length of the name
54 * contained in the entry. These are followed by the name padded to an 8
55 * byte boundary with null bytes. All names are guaranteed null terminated.
56 * The maximum length of a name in a directory is MAXNAMLEN.
58 * Explicit padding between the last member of the header (d_namlen) and
59 * d_name avoids ABI padding at the end of dirent on LP64 architectures.
60 * There is code depending on d_name being last.
64 ino_t d_fileno; /* file number of entry */
65 off_t d_off; /* directory offset of next entry */
66 __uint16_t d_reclen; /* length of this record */
67 __uint8_t d_type; /* file type, see below */
69 __uint16_t d_namlen; /* length of string in d_name */
73 char d_name[MAXNAMLEN + 1]; /* name must be no longer than this */
75 char d_name[255 + 1]; /* name must be no longer than this */
79 #if defined(_WANT_FREEBSD11_DIRENT) || defined(_KERNEL)
80 struct freebsd11_dirent {
81 __uint32_t d_fileno; /* file number of entry */
82 __uint16_t d_reclen; /* length of this record */
83 __uint8_t d_type; /* file type, see below */
84 __uint8_t d_namlen; /* length of string in d_name */
85 char d_name[255 + 1]; /* name must be no longer than this */
87 #endif /* _WANT_FREEBSD11_DIRENT || _KERNEL */
105 * Convert between stat structure types and directory types.
107 #define IFTODT(mode) (((mode) & 0170000) >> 12)
108 #define DTTOIF(dirtype) ((dirtype) << 12)
111 * The _GENERIC_DIRSIZ macro gives the minimum record length which will hold
112 * the directory entry. This returns the amount of space in struct dirent
113 * without the d_name field, plus enough space for the name with a terminating
114 * null byte (dp->d_namlen+1), rounded up to a 8 byte boundary.
116 * XXX although this macro is in the implementation namespace, it requires
117 * a manifest constant that is not.
119 #define _GENERIC_DIRLEN(namlen) \
120 ((__offsetof(struct dirent, d_name) + (namlen) + 1 + 7) & ~7)
121 #define _GENERIC_DIRSIZ(dp) _GENERIC_DIRLEN((dp)->d_namlen)
122 #define _GENERIC_MINDIRSIZ _GENERIC_DIRLEN(1) /* Name must not be empty */
123 #define _GENERIC_MAXDIRSIZ _GENERIC_DIRLEN(MAXNAMLEN)
124 #endif /* __BSD_VISIBLE */
127 #define GENERIC_DIRSIZ(dp) _GENERIC_DIRSIZ(dp)
128 #define GENERIC_MINDIRSIZ _GENERIC_MINDIRSIZ
129 #define GENERIC_MAXDIRSIZ _GENERIC_MAXDIRSIZ
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_ */