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Annotation of 43BSDReno/share/man/man4/fd.4, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1990 The Regents of the University of California.
                      2: .\" All rights reserved.
                      3: .\"
                      4: .\" Redistribution and use in source and binary forms are permitted
                      5: .\" provided that: (1) source distributions retain this entire copyright
                      6: .\" notice and comment, and (2) distributions including binaries display
                      7: .\" the following acknowledgement:  ``This product includes software
                      8: .\" developed by the University of California, Berkeley and its contributors''
                      9: .\" in the documentation or other materials provided with the distribution
                     10: .\" and in all advertising materials mentioning features or use of this
                     11: .\" software. Neither the name of the University nor the names of its
                     12: .\" contributors may be used to endorse or promote products derived
                     13: .\" from this software without specific prior written permission.
                     14: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     15: .\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     16: .\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     17: .\"
                     18: .\"    @(#)fd.4        5.1 (Berkeley) 5/10/90
                     19: .\"
                     20: .TH FD 4 "May 10, 1990"
                     21: .UC 7
                     22: .SH NAME
                     23: fd, stdin, stdout, stderr \- file descriptor files
                     24: .SH DESCRIPTION
                     25: The files
                     26: .I /dev/fd/0
                     27: through
                     28: .I /dev/fd/#
                     29: refer to file descriptors which can be accessed through the file
                     30: system.
                     31: If the file descriptor is open and the mode the file is being opened
                     32: with is a subset of the mode of the existing descriptor, the call:
                     33: .sp
                     34: .RS
                     35: fd = open("/dev/fd/0", mode);
                     36: .RE
                     37: .sp
                     38: and the call:
                     39: .sp
                     40: .RS
                     41: fd = fcntl(0, F_DUPFD, 0);
                     42: .RE
                     43: .sp
                     44: are equivalent.
                     45: .PP
                     46: Opening the files
                     47: .IR /dev/stdin ,
                     48: .I /dev/stdout
                     49: and
                     50: .I /dev/stderr
                     51: is equivalent to the following calls:
                     52: .sp
                     53: .RS
                     54: fd = fcntl(STDIN_FILENO,  F_DUPFD, 0);
                     55: .br
                     56: fd = fcntl(STDOUT_FILENO, F_DUPFD, 0);
                     57: .br
                     58: fd = fcntl(STDERR_FILENO, F_DUPFD, 0);
                     59: .RE
                     60: .PP
                     61: Flags to the
                     62: .IR open (2)
                     63: call other than O_RDONLY, O_WRONLY and O_RDWR are ignored.
                     64: .SH FILES
                     65: /dev/fd/#
                     66: .br
                     67: /dev/stdin
                     68: .br
                     69: /dev/stdout
                     70: .br
                     71: /dev/stderr
                     72: .SH SEE ALSO
                     73: tty(4)

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