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