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-.\"
-.\" Copyright (c) 1993, Sun Microsystems, Inc. All Rights Reserved.
-.\" Copyright 1989 AT&T
-.\" Copyright 2021 Oxide Computer Company
-.\"
-.\" The contents of this file are subject to the terms of the
-.\" Common Development and Distribution License (the "License").
-.\" You may not use this file except in compliance with the License.
-.\"
-.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
-.\" or http://www.opensolaris.org/os/licensing.
-.\" See the License for the specific language governing permissions
-.\" and limitations under the License.
-.\"
-.\" When distributing Covered Code, include this CDDL HEADER in each
-.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
-.\" If applicable, add the following below this CDDL HEADER, with the
-.\" fields enclosed by brackets "[]" replaced with your own identifying
-.\" information: Portions Copyright [yyyy] [name of copyright owner]
-.\"
-.Dd July 3, 1990
-.Dt FD 7FS
-.Os
-.Sh NAME
-.Nm fd ,
-.Nm stdin ,
-.Nm stdout ,
-.Nm stderr
-.Nd file descriptor files
-.Sh DESCRIPTION
-These files, conventionally called
-.Pa /dev/fd/0 ,
-.Pa /dev/fd/1 ,
-.Pa /dev/fd/2 ,
-and so on, refer to files accessible through file descriptors.
-If file descriptor
-.Em n
-is open, these two system calls have the same
-effect:
-.Bd -literal -offset indent
-fd = open("/dev/fd/<n>", mode);
-fd = dup(n);
-.Ed
-.Pp
-On these files
-.Xr creat 2
-is equivalent to
-.Xr open 2 ,
-and
-.Fa mode
-is
-ignored.
-As with
-.Xr dup 2 ,
-subsequent reads or writes on
-.Em fd
-fail unless the original file descriptor allows the operations.
-.Pp
-For convenience in referring to standard input, standard output, and standard
-error, an additional set of names is provided:
-.Pa /dev/stdin
-is a synonym
-for
-.Pa /dev/fd/0 ,
-.Pa /dev/stdout
-for
-.Pa /dev/fd/1 ,
-and
-.Pa /dev/stderr
-for
-.Pa /dev/fd/2 .
-.Sh DIAGNOSTICS
-.Xr open 2
-returns
-.Sy -1
-and
-.Va errno
-is set to
-.Er EBADF
-if the associated file descriptor is not open.
-.Sh SEE ALSO
-.Xr creat 2 ,
-.Xr dup 2 ,
-.Xr open 2