f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
132 lines
4 KiB
Groff
132 lines
4 KiB
Groff
.\" $NetBSD: getdents.2,v 1.23 2011/07/20 17:51:25 njoly 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. 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 4, 2010
|
|
.Dt GETDENTS 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm getdents
|
|
.Nd "get directory entries in a filesystem independent format"
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In 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:
|
|
.Bd -literal -offset indent
|
|
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];
|
|
};
|
|
.Ed
|
|
.Pp
|
|
The structure is described in
|
|
.Xr dirent 3 .
|
|
.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 getdents
|
|
will fail if:
|
|
.Bl -tag -width "[EINVAL]"
|
|
.It Bq Er EBADF
|
|
.Fa fd
|
|
is not a valid file descriptor open for reading.
|
|
.It Bq Er EFAULT
|
|
.Fa buf
|
|
points outside the allocated address space.
|
|
.It Bq Er EINVAL
|
|
A directory was being read on NFS, but it was modified on the server while
|
|
it was being read.
|
|
.It Bq Er EIO
|
|
An
|
|
.Tn I/O
|
|
error occurred while reading from or writing to the file system.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr lseek 2 ,
|
|
.Xr open 2 ,
|
|
.Xr dirent 3
|
|
.Sh HISTORY
|
|
The
|
|
.Fn getdents
|
|
function first appeared in
|
|
.Nx 1.3 .
|