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