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Annotation of 43BSDReno/share/doc/ps1/06.sysman/1.0.t, 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: .\"    @(#)1.0.t       6.2 (Berkeley) 5/12/86
        !             6: .\"
        !             7: .ds ss 1
        !             8: .sh "Kernel primitives
        !             9: .PP
        !            10: The facilities available to a UNIX user process are logically
        !            11: divided into two parts: kernel facilities directly implemented by
        !            12: UNIX code running in the operating system, and system facilities
        !            13: implemented either by the system, or in cooperation with a
        !            14: \fIserver process\fP.  These kernel facilities are described in
        !            15: this section 1.
        !            16: .PP
        !            17: The facilities implemented in the kernel are those which define the
        !            18: \fIUNIX virtual machine\fP in which each process runs.
        !            19: Like many real machines, this virtual machine has memory management hardware,
        !            20: an interrupt facility, timers and counters.  The UNIX
        !            21: virtual machine also allows access to files and other objects through a set of
        !            22: \fIdescriptors\fP.  Each descriptor resembles a device controller,
        !            23: and supports a set of operations.  Like devices on real machines, some
        !            24: of which are internal to the machine and some of which are external,
        !            25: parts of the descriptor machinery are built-in to the operating system, while
        !            26: other parts are often implemented in server processes on other machines.
        !            27: The facilities provided through the descriptor machinery are described in
        !            28: section 2.
        !            29: .ds ss 2

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