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Annotation of 43BSDReno/share/doc/ps1/06.sysman/1.0.t, revision 1.1.1.1

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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