projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 9bccf70c A |
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 |