getdirentries man page on OpenDarwin

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GETDIRENTRIES(2)	    BSD System Calls Manual	      GETDIRENTRIES(2)

NAME
     getdirentries — get directory entries in a filesystem independent format

SYNOPSIS
     #include <sys/types.h>
     #include <sys/dirent.h>

     int
     getdirentries(int fd, char *buf, int nbytes, long *basep);

DESCRIPTION
     Getdirentries() reads directory entries from the directory referenced by
     the file descriptor fd into the buffer pointed to by buf, in a filesystem
     independent format.  Up to nbytes of data will be transferred.  Nbytes
     must be greater than or equal to the block size associated with the file,
     see stat(2).  Some filesystems may not support getdirentries() with buf‐
     fers smaller than this size.

     The data in the buffer is a series of dirent structures each containing
     the following entries:

	   u_int32_t	   d_fileno;		 /* file number of entry */
	   u_int16_t	   d_reclen;		 /* length of this record */
	   u_int8_t	   d_type;		 /* file type, see below */
	   u_int8_t	   d_namlen;		 /* length of string in d_name */
	   char		   d_name[MAXNAMELEN + 1]; /* see below */

     The d_fileno entry is a number which is unique for each distinct file in
     the filesystem.  Files that are linked by hard links (see link(2)) have
     the same d_fileno.	 Users of getdirentries() should skip entries with
     d_fileno = 0, as such entries represent files which have been deleted but
     not yet removed from the directory entry.	The d_reclen entry is the
     length, in bytes, of the directory record.	 The d_name entry contains a
     null terminated file name.	 The d_namlen entry specifies the length of
     the file name excluding the null byte.  Thus the actual size of d_name
     may vary from 1 to MAXNAMELEN + 1.	 d_type is a integer representing the
     type of the directory entry.  The following types are defined in
     ⟨sys/dirent.h⟩:

	   #define DT_UNKNOWN	    0
	   #define DT_FIFO	    1
	   #define DT_CHR	    2
	   #define DT_DIR	    4
	   #define DT_BLK	    6
	   #define DT_REG	    8
	   #define DT_LNK	   10
	   #define DT_SOCK	   12
	   #define DT_WHT	   14

     Entries may be separated by extra space.  The d_reclen entry may be used
     as an offset from the start of a dirent structure to the next structure,
     if any.

     The actual number of bytes transferred is returned.  The current position
     pointer associated with fd is set to point to the next block of entries.
     The pointer may not advance by the number of bytes returned by
     getdirentries().  A value of zero is returned when the end of the direc‐
     tory has been reached.

     Getdirentries() writes the position of the block read into the location
     pointed to by basep.  Alternatively, the current position pointer may be
     set and retrieved by lseek(2).  The current position pointer should only
     be set to a value returned by lseek(2), a value returned in the location
     pointed to by basep, or zero.

RETURN VALUES
     If successful, the number of bytes actually transferred is returned.
     Otherwise, -1 is returned and the global variable errno is set to indi‐
     cate the error.

ERRORS
     Getdirentries() will fail if:

     [EBADF]		fd is not a valid file descriptor open for reading.

     [EFAULT]		Either buf or basep point outside the allocated
			address space.

     [EIO]		An I/O error occurred while reading from or writing to
			the file system.

SEE ALSO
     open(2), lseek(2)

HISTORY
     The getdirentries() function first appeared in 4.4BSD.

BSD				 June 9, 1993				   BSD
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