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-.\"	$NetBSD: getdents.2,v 1.4 1999/04/17 10:15:34 kleink Exp $
-.\"
-.\" Copyright (c) 1989, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"	@(#)getdirentries.2	8.1 (Berkeley) 6/9/93
-.\"
-.Dd June 9, 1993
-.Dt GETDENTS 2
-.Os
-.Sh NAME
-.Nm getdents
-.Nd "get directory entries in a filesystem independent format"
-.Sh SYNOPSIS
-.Fd #include <dirent.h>
-.Ft int
-.Fn getdents "int fd" "char *buf" "size_t nbytes"
-.Sh DESCRIPTION
-.Fn getdents
-reads directory entries from the directory
-referenced by the file descriptor
-.Fa fd
-into the buffer pointed to by
-.Fa buf ,
-in a filesystem independent format.
-Up to
-.Fa nbytes
-of data will be transferred.
-.Fa nbytes
-must be greater than or equal to the
-block size associated with the file,
-see
-.Xr stat 2 .
-Some filesystems may not support
-.Fn getdents
-with buffers smaller than this size.
-.Pp
-The data in the buffer is a series of
-.Em dirent
-structures each containing the following entries:
-.Bd -literal -offset indent
-unsigned long	d_fileno;
-unsigned short	d_reclen;
-unsigned short	d_namlen;
-char    	d_name[MAXNAMELEN + 1]; /* see below */
-.Ed
-.Pp
-The
-.Fa d_fileno
-entry is a number which is unique for each
-distinct file in the filesystem.
-Files that are linked by hard links (see
-.Xr link 2 )
-have the same
-.Fa d_fileno .
-The
-.Fa d_reclen
-entry is the length, in bytes, of the directory record.
-The
-.Fa d_name
-entry contains a null terminated file name.
-The
-.Fa d_namlen
-entry specifies the length of the file name excluding the null byte.
-Thus the actual size of
-.Fa d_name
-may vary from 1 to
-.Dv MAXNAMELEN
-\&+ 1.
-.Pp
-Entries may be separated by extra space.
-The
-.Fa d_reclen
-entry may be used as an offset from the start of a
-.Fa dirent
-structure to the next structure, if any.
-.Pp
-The actual number of bytes transferred is returned.
-The current position pointer associated with
-.Fa fd
-is set to point to the next block of entries.
-The pointer may not advance by the number of bytes returned by
-.Fn getdents .
-A value of zero is returned when
-the end of the directory has been reached.
-.Pp
-The current position pointer may be set and retrieved by
-.Xr lseek 2 .
-The current position pointer should only be set to a value returned by
-.Xr lseek 2 ,
-or zero.
-.Sh RETURN VALUES
-If successful, the number of bytes actually transferred is returned.
-Otherwise, -1 is returned and the global variable
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-.Fn gtdents
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EBADF
-.Fa fd
-is not a valid file descriptor open for reading.
-.It Bq Er EFAULT
-Either
-.Fa buf
-points outside the allocated address space.
-.It Bq Er EIO
-An
-.Tn I/O
-error occurred while reading from or writing to the file system.
-.It Bq Er EINVAL
-A directory was being read on NFS, but it was modified on the server while
-it was being read.
-.El
-.Sh SEE ALSO
-.Xr open 2 ,
-.Xr lseek 2
-.Sh HISTORY
-The
-.Fn getdents
-function first appeared in
-.Nx 1.3 .