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Annotation of 43BSDReno/share/man/man3f/fork.3, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1983 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)fork.3f     6.2 (Berkeley) 5/27/86
        !             6: .\"
        !             7: .TH FORK 3F "May 27, 1986"
        !             8: .UC 5
        !             9: .SH NAME
        !            10: fork \- create a copy of this process
        !            11: .SH SYNOPSIS
        !            12: .B integer function fork()
        !            13: .SH DESCRIPTION
        !            14: .I Fork
        !            15: creates a copy of the calling process.
        !            16: The only distinction between the 2 processes is that the value
        !            17: returned to one of them (referred to as the `parent' process)
        !            18: will be the process id of the copy.
        !            19: The copy is usually referred to as the `child' process.
        !            20: The value returned to the `child' process will be zero.
        !            21: .PP
        !            22: All logical units open for writing are flushed before the fork to avoid
        !            23: duplication of the contents of I/O buffers in the external file(s).
        !            24: .PP
        !            25: If the returned value is negative, it indicates an error and will be
        !            26: the negation of the system error code.
        !            27: See perror(3F).
        !            28: .PP
        !            29: A corresponding
        !            30: .I exec
        !            31: routine has not been provided because there is no satisfactory way to
        !            32: retain open logical units across the exec.
        !            33: However, the usual function of
        !            34: .I fork/exec
        !            35: can be performed using
        !            36: .IR system (3F).
        !            37: .if 0 \{
        !            38: A pipe can be opened to another process using the f77
        !            39: .B open
        !            40: statement with
        !            41: .sp 1
        !            42: .ti +5
        !            43: .B "file=\(fm\fIprocess\fB\(fm, status=\(fmpipe\(fm, access=\(fmread\(fm"
        !            44: .br
        !            45: or
        !            46: .br
        !            47: .ti +5
        !            48: .B "file=\(fm\fIprocess\fB\(fm, status=\(fmpipe\(fm, access=\(fmwrite\(fm"
        !            49: \}
        !            50: .SH FILES
        !            51: .ie \nM /usr/ucb/lib/libU77.a
        !            52: .el /usr/lib/libU77.a
        !            53: .SH "SEE ALSO"
        !            54: fork(2), wait(3F), kill(3F), system(3F), perror(3F)

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