mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-27 05:21:08 +01:00
92 lines
2.9 KiB
Groff
92 lines
2.9 KiB
Groff
|
.\" Copyright (c) 1990, 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.
|
||
|
|
.\"
|
||
|
|
.\" @(#)fd.4 8.1 (Berkeley) 6/9/93
|
||
|
|
.\"
|
||
|
|
.Dd June 9, 1993
|
||
|
|
.Dt FD 4
|
||
|
|
.Os
|
||
|
|
.Sh NAME
|
||
|
|
.Nm fd ,
|
||
|
|
.Nm stdin ,
|
||
|
|
.Nm stdout ,
|
||
|
|
.Nm stderr
|
||
|
|
.Nd file descriptor files
|
||
|
|
.Sh DESCRIPTION
|
||
|
|
The files
|
||
|
|
.Pa /dev/fd/0
|
||
|
|
through
|
||
|
|
.Pa /dev/fd/#
|
||
|
|
refer to file descriptors which can be accessed through the file
|
||
|
|
system.
|
||
|
|
If the file descriptor is open and the mode the file is being opened
|
||
|
|
with is a subset of the mode of the existing descriptor, the call:
|
||
|
|
.Bd -literal -offset indent
|
||
|
|
fd = open("/dev/fd/0", mode);
|
||
|
|
.Ed
|
||
|
|
.Pp
|
||
|
|
and the call:
|
||
|
|
.Bd -literal -offset indent
|
||
|
|
fd = fcntl(0, F_DUPFD, 0);
|
||
|
|
.Ed
|
||
|
|
.Pp
|
||
|
|
are equivalent.
|
||
|
|
.Pp
|
||
|
|
Opening the files
|
||
|
|
.Pa /dev/stdin ,
|
||
|
|
.Pa /dev/stdout
|
||
|
|
and
|
||
|
|
.Pa /dev/stderr
|
||
|
|
is equivalent to the following calls:
|
||
|
|
.Bd -literal -offset indent
|
||
|
|
fd = fcntl(STDIN_FILENO, F_DUPFD, 0);
|
||
|
|
fd = fcntl(STDOUT_FILENO, F_DUPFD, 0);
|
||
|
|
fd = fcntl(STDERR_FILENO, F_DUPFD, 0);
|
||
|
|
.Ed
|
||
|
|
.Pp
|
||
|
|
Flags to the
|
||
|
|
.Xr open 2
|
||
|
|
call other than
|
||
|
|
.Dv O_RDONLY ,
|
||
|
|
.Dv O_WRONLY
|
||
|
|
and
|
||
|
|
.Dv O_RDWR
|
||
|
|
are ignored.
|
||
|
|
.Sh FILES
|
||
|
|
.Bl -tag -width /dev/stderr -compact
|
||
|
|
.It Pa /dev/fd/#
|
||
|
|
.It Pa /dev/stdin
|
||
|
|
.It Pa /dev/stdout
|
||
|
|
.It Pa /dev/stderr
|
||
|
|
.El
|
||
|
|
.Sh SEE ALSO
|
||
|
|
.Xr tty 4
|