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30 .\" @(#)getdirentries.2 8.1 (Berkeley) 6/9/93
37 .Nd "get directory entries in a filesystem independent format"
41 .Fn getdirentries "int fd" "char *buf" "int nbytes" "long *basep"
44 .\" This interface is available from the compatibility library, libcompat and
45 This interface is provided for compatibility only and
51 reads directory entries from the directory
52 referenced by the file descriptor
54 into the buffer pointed to by
56 in a filesystem independent format.
59 of data will be transferred.
61 must be greater than or equal to the
62 block size associated with the file,
65 Some filesystems may not support
67 with buffers smaller than this size.
69 The data in the buffer is a series of
71 structures each containing the following entries:
72 .Bd -literal -offset indent
73 unsigned long d_fileno;
74 unsigned short d_reclen;
75 unsigned short d_namlen;
76 char d_name[MAXNAMELEN + 1]; /* see below */
81 entry is a number which is unique for each
82 distinct file in the filesystem.
83 Files that are linked by hard links (see
89 is zero, the entry refers to a deleted file.
93 entry is the length, in bytes, of the directory record.
97 entry specifies the length of the file name excluding the null byte.
98 Thus the actual size of
106 entry contains a null terminated file name.
108 Entries may be separated by extra space.
111 entry may be used as an offset from the start of a
113 structure to the next structure, if any.
115 The actual number of bytes transferred is returned.
116 The current position pointer associated with
118 is set to point to the next block of entries.
119 The pointer may not advance by the number of bytes returned by
121 A value of zero is returned when
122 the end of the directory has been reached.
125 writes the position of the block read into the location pointed to by
127 Alternatively, the current position pointer may be set and retrieved by
129 The current position pointer should only be set to a value returned by
131 a value returned in the location pointed to by
135 If successful, the number of bytes actually transferred is returned.
136 Otherwise, \-1 is returned and the global variable
138 is set to indicate the error.
145 is not a valid file descriptor open for reading.
151 point outside the allocated address space.
155 error occurred while reading from or writing to the file system.
163 function first appeared in