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NetBSD 6.1.5 - man page for getdents (netbsd section 2)

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GETDENTS(2)			     BSD System Calls Manual			      GETDENTS(2)

NAME
     getdents -- get directory entries in a filesystem independent format

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <dirent.h>

     int
     getdents(int fd, char *buf, size_t nbytes);

DESCRIPTION
     getdents() 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 getdents() with buffers smaller
     than this size.

     The data in the buffer is a series of dirent structures:

	   struct dirent {
		   ino_t    d_fileno;		   /* file number of entry */
		   uint16_t d_reclen;		   /* length of this record */
		   uint16_t d_namlen;		   /* length of d_name */
		   uint8_t  d_type;		   /* file type, see below */
		   char     d_name[MAXNAMELEN + 1];
	   };

     The structure is described in dirent(3).

     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 getdents().  A value of zero is returned when the end of the
     directory has been reached.

     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), 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 indicate the error.

ERRORS
     getdents() will fail if:

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

     [EFAULT]  buf points outside the allocated address space.

     [EINVAL]  A directory was being read on NFS, but it was modified on the server while it was
	       being read.

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

SEE ALSO
     lseek(2), open(2), dirent(3)

HISTORY
     The getdents() function first appeared in NetBSD 1.3.

BSD					   June 4, 2010 				      BSD
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