1*699cd480SApple OSS Distributions.\" $NetBSD: fd.4,v 1.3 1994/11/30 16:22:13 jtc Exp $ 2*699cd480SApple OSS Distributions.\" 3*699cd480SApple OSS Distributions.\" Copyright (c) 1990, 1991, 1993 4*699cd480SApple OSS Distributions.\" The Regents of the University of California. All rights reserved. 5*699cd480SApple OSS Distributions.\" 6*699cd480SApple OSS Distributions.\" Redistribution and use in source and binary forms, with or without 7*699cd480SApple OSS Distributions.\" modification, are permitted provided that the following conditions 8*699cd480SApple OSS Distributions.\" are met: 9*699cd480SApple OSS Distributions.\" 1. Redistributions of source code must retain the above copyright 10*699cd480SApple OSS Distributions.\" notice, this list of conditions and the following disclaimer. 11*699cd480SApple OSS Distributions.\" 2. Redistributions in binary form must reproduce the above copyright 12*699cd480SApple OSS Distributions.\" notice, this list of conditions and the following disclaimer in the 13*699cd480SApple OSS Distributions.\" documentation and/or other materials provided with the distribution. 14*699cd480SApple OSS Distributions.\" 3. All advertising materials mentioning features or use of this software 15*699cd480SApple OSS Distributions.\" must display the following acknowledgement: 16*699cd480SApple OSS Distributions.\" This product includes software developed by the University of 17*699cd480SApple OSS Distributions.\" California, Berkeley and its contributors. 18*699cd480SApple OSS Distributions.\" 4. Neither the name of the University nor the names of its contributors 19*699cd480SApple OSS Distributions.\" may be used to endorse or promote products derived from this software 20*699cd480SApple OSS Distributions.\" without specific prior written permission. 21*699cd480SApple OSS Distributions.\" 22*699cd480SApple OSS Distributions.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23*699cd480SApple OSS Distributions.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24*699cd480SApple OSS Distributions.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25*699cd480SApple OSS Distributions.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26*699cd480SApple OSS Distributions.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27*699cd480SApple OSS Distributions.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28*699cd480SApple OSS Distributions.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29*699cd480SApple OSS Distributions.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30*699cd480SApple OSS Distributions.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31*699cd480SApple OSS Distributions.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32*699cd480SApple OSS Distributions.\" SUCH DAMAGE. 33*699cd480SApple OSS Distributions.\" 34*699cd480SApple OSS Distributions.\" @(#)fd.4 8.1 (Berkeley) 6/9/93 35*699cd480SApple OSS Distributions.\" 36*699cd480SApple OSS Distributions.Dd June 9, 1993 37*699cd480SApple OSS Distributions.Dt FD 4 38*699cd480SApple OSS Distributions.Os 39*699cd480SApple OSS Distributions.Sh NAME 40*699cd480SApple OSS Distributions.Nm fd , 41*699cd480SApple OSS Distributions.Nm stdin , 42*699cd480SApple OSS Distributions.Nm stdout , 43*699cd480SApple OSS Distributions.Nm stderr 44*699cd480SApple OSS Distributions.Nd file descriptor files 45*699cd480SApple OSS Distributions.Sh DESCRIPTION 46*699cd480SApple OSS DistributionsThe files 47*699cd480SApple OSS Distributions.Pa /dev/fd/0 48*699cd480SApple OSS Distributionsthrough 49*699cd480SApple OSS Distributions.Pa /dev/fd/# 50*699cd480SApple OSS Distributionsrefer to file descriptors which can be accessed through the file 51*699cd480SApple OSS Distributionssystem. 52*699cd480SApple OSS DistributionsIf the file descriptor is open and the mode the file is being opened 53*699cd480SApple OSS Distributionswith is a subset of the mode of the existing descriptor, the call: 54*699cd480SApple OSS Distributions.Bd -literal -offset indent 55*699cd480SApple OSS Distributionsfd = open("/dev/fd/0", mode); 56*699cd480SApple OSS Distributions.Ed 57*699cd480SApple OSS Distributions.Pp 58*699cd480SApple OSS Distributionsand the call: 59*699cd480SApple OSS Distributions.Bd -literal -offset indent 60*699cd480SApple OSS Distributionsfd = fcntl(0, F_DUPFD, 0); 61*699cd480SApple OSS Distributions.Ed 62*699cd480SApple OSS Distributions.Pp 63*699cd480SApple OSS Distributionsare equivalent. 64*699cd480SApple OSS Distributions.Pp 65*699cd480SApple OSS DistributionsOpening the files 66*699cd480SApple OSS Distributions.Pa /dev/stdin , 67*699cd480SApple OSS Distributions.Pa /dev/stdout 68*699cd480SApple OSS Distributionsand 69*699cd480SApple OSS Distributions.Pa /dev/stderr 70*699cd480SApple OSS Distributionsis equivalent to the following calls: 71*699cd480SApple OSS Distributions.Bd -literal -offset indent 72*699cd480SApple OSS Distributionsfd = fcntl(STDIN_FILENO, F_DUPFD, 0); 73*699cd480SApple OSS Distributionsfd = fcntl(STDOUT_FILENO, F_DUPFD, 0); 74*699cd480SApple OSS Distributionsfd = fcntl(STDERR_FILENO, F_DUPFD, 0); 75*699cd480SApple OSS Distributions.Ed 76*699cd480SApple OSS Distributions.Pp 77*699cd480SApple OSS DistributionsFlags to the 78*699cd480SApple OSS Distributions.Xr open 2 79*699cd480SApple OSS Distributionscall other than 80*699cd480SApple OSS Distributions.Dv O_RDONLY , 81*699cd480SApple OSS Distributions.Dv O_WRONLY 82*699cd480SApple OSS Distributionsand 83*699cd480SApple OSS Distributions.Dv O_RDWR 84*699cd480SApple OSS Distributionsare ignored. 85*699cd480SApple OSS Distributions.Sh FILES 86*699cd480SApple OSS Distributions.Bl -tag -width /dev/stderr -compact 87*699cd480SApple OSS Distributions.It Pa /dev/fd/# 88*699cd480SApple OSS Distributions.It Pa /dev/stdin 89*699cd480SApple OSS Distributions.It Pa /dev/stdout 90*699cd480SApple OSS Distributions.It Pa /dev/stderr 91*699cd480SApple OSS Distributions.El 92*699cd480SApple OSS Distributions.Sh SEE ALSO 93*699cd480SApple OSS Distributions.Xr tty 4 94