1*1031c584SApple OSS Distributions.\" $NetBSD: fd.4,v 1.3 1994/11/30 16:22:13 jtc Exp $ 2*1031c584SApple OSS Distributions.\" 3*1031c584SApple OSS Distributions.\" Copyright (c) 1990, 1991, 1993 4*1031c584SApple OSS Distributions.\" The Regents of the University of California. All rights reserved. 5*1031c584SApple OSS Distributions.\" 6*1031c584SApple OSS Distributions.\" Redistribution and use in source and binary forms, with or without 7*1031c584SApple OSS Distributions.\" modification, are permitted provided that the following conditions 8*1031c584SApple OSS Distributions.\" are met: 9*1031c584SApple OSS Distributions.\" 1. Redistributions of source code must retain the above copyright 10*1031c584SApple OSS Distributions.\" notice, this list of conditions and the following disclaimer. 11*1031c584SApple OSS Distributions.\" 2. Redistributions in binary form must reproduce the above copyright 12*1031c584SApple OSS Distributions.\" notice, this list of conditions and the following disclaimer in the 13*1031c584SApple OSS Distributions.\" documentation and/or other materials provided with the distribution. 14*1031c584SApple OSS Distributions.\" 3. All advertising materials mentioning features or use of this software 15*1031c584SApple OSS Distributions.\" must display the following acknowledgement: 16*1031c584SApple OSS Distributions.\" This product includes software developed by the University of 17*1031c584SApple OSS Distributions.\" California, Berkeley and its contributors. 18*1031c584SApple OSS Distributions.\" 4. Neither the name of the University nor the names of its contributors 19*1031c584SApple OSS Distributions.\" may be used to endorse or promote products derived from this software 20*1031c584SApple OSS Distributions.\" without specific prior written permission. 21*1031c584SApple OSS Distributions.\" 22*1031c584SApple OSS Distributions.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23*1031c584SApple OSS Distributions.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24*1031c584SApple OSS Distributions.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25*1031c584SApple OSS Distributions.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26*1031c584SApple OSS Distributions.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27*1031c584SApple OSS Distributions.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28*1031c584SApple OSS Distributions.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29*1031c584SApple OSS Distributions.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30*1031c584SApple OSS Distributions.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31*1031c584SApple OSS Distributions.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32*1031c584SApple OSS Distributions.\" SUCH DAMAGE. 33*1031c584SApple OSS Distributions.\" 34*1031c584SApple OSS Distributions.\" @(#)fd.4 8.1 (Berkeley) 6/9/93 35*1031c584SApple OSS Distributions.\" 36*1031c584SApple OSS Distributions.Dd June 9, 1993 37*1031c584SApple OSS Distributions.Dt FD 4 38*1031c584SApple OSS Distributions.Os 39*1031c584SApple OSS Distributions.Sh NAME 40*1031c584SApple OSS Distributions.Nm fd , 41*1031c584SApple OSS Distributions.Nm stdin , 42*1031c584SApple OSS Distributions.Nm stdout , 43*1031c584SApple OSS Distributions.Nm stderr 44*1031c584SApple OSS Distributions.Nd file descriptor files 45*1031c584SApple OSS Distributions.Sh DESCRIPTION 46*1031c584SApple OSS DistributionsThe files 47*1031c584SApple OSS Distributions.Pa /dev/fd/0 48*1031c584SApple OSS Distributionsthrough 49*1031c584SApple OSS Distributions.Pa /dev/fd/# 50*1031c584SApple OSS Distributionsrefer to file descriptors which can be accessed through the file 51*1031c584SApple OSS Distributionssystem. 52*1031c584SApple OSS DistributionsIf the file descriptor is open and the mode the file is being opened 53*1031c584SApple OSS Distributionswith is a subset of the mode of the existing descriptor, the call: 54*1031c584SApple OSS Distributions.Bd -literal -offset indent 55*1031c584SApple OSS Distributionsfd = open("/dev/fd/0", mode); 56*1031c584SApple OSS Distributions.Ed 57*1031c584SApple OSS Distributions.Pp 58*1031c584SApple OSS Distributionsand the call: 59*1031c584SApple OSS Distributions.Bd -literal -offset indent 60*1031c584SApple OSS Distributionsfd = fcntl(0, F_DUPFD, 0); 61*1031c584SApple OSS Distributions.Ed 62*1031c584SApple OSS Distributions.Pp 63*1031c584SApple OSS Distributionsare equivalent. 64*1031c584SApple OSS Distributions.Pp 65*1031c584SApple OSS DistributionsOpening the files 66*1031c584SApple OSS Distributions.Pa /dev/stdin , 67*1031c584SApple OSS Distributions.Pa /dev/stdout 68*1031c584SApple OSS Distributionsand 69*1031c584SApple OSS Distributions.Pa /dev/stderr 70*1031c584SApple OSS Distributionsis equivalent to the following calls: 71*1031c584SApple OSS Distributions.Bd -literal -offset indent 72*1031c584SApple OSS Distributionsfd = fcntl(STDIN_FILENO, F_DUPFD, 0); 73*1031c584SApple OSS Distributionsfd = fcntl(STDOUT_FILENO, F_DUPFD, 0); 74*1031c584SApple OSS Distributionsfd = fcntl(STDERR_FILENO, F_DUPFD, 0); 75*1031c584SApple OSS Distributions.Ed 76*1031c584SApple OSS Distributions.Pp 77*1031c584SApple OSS DistributionsFlags to the 78*1031c584SApple OSS Distributions.Xr open 2 79*1031c584SApple OSS Distributionscall other than 80*1031c584SApple OSS Distributions.Dv O_RDONLY , 81*1031c584SApple OSS Distributions.Dv O_WRONLY 82*1031c584SApple OSS Distributionsand 83*1031c584SApple OSS Distributions.Dv O_RDWR 84*1031c584SApple OSS Distributionsare ignored. 85*1031c584SApple OSS Distributions.Sh FILES 86*1031c584SApple OSS Distributions.Bl -tag -width /dev/stderr -compact 87*1031c584SApple OSS Distributions.It Pa /dev/fd/# 88*1031c584SApple OSS Distributions.It Pa /dev/stdin 89*1031c584SApple OSS Distributions.It Pa /dev/stdout 90*1031c584SApple OSS Distributions.It Pa /dev/stderr 91*1031c584SApple OSS Distributions.El 92*1031c584SApple OSS Distributions.Sh SEE ALSO 93*1031c584SApple OSS Distributions.Xr tty 4 94