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Annotation of 43BSDReno/share/doc/ps1/06.sysman/2.0.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: .\"    @(#)2.0.t       6.2 (Berkeley) 5/12/86
        !             6: .\"
        !             7: .ds ss 1
        !             8: .sh "System facilities
        !             9: This section discusses the system facilities that
        !            10: are not considered part of the kernel.
        !            11: .PP
        !            12: The system abstractions described are:
        !            13: .IP "Directory contexts
        !            14: .br
        !            15: A directory context is a position in the UNIX file system name
        !            16: space.  Operations on files and other named objects in a file system are
        !            17: always specified relative to such a context.
        !            18: .IP "Files
        !            19: .br
        !            20: Files are used to store uninterpreted sequence of bytes on which
        !            21: random access \fIreads\fP and \fIwrites\fP may occur.
        !            22: Pages from files may also be mapped into process address space.\(dg
        !            23: A directory may be read as a file.
        !            24: .FS
        !            25: \(dg Support for mapping files is not included in the 4.3 release.
        !            26: .FE
        !            27: .IP "Communications domains
        !            28: .br
        !            29: A communications domain represents
        !            30: an interprocess communications environment, such as the communications
        !            31: facilities of the UNIX system,
        !            32: communications in the INTERNET, or the resource sharing protocols
        !            33: and access rights of a resource sharing system on a local network.
        !            34: .IP "Sockets
        !            35: .br
        !            36: A socket is an endpoint of communication and the focal
        !            37: point for IPC in a communications domain.  Sockets may be created in pairs,
        !            38: or given names and used to rendezvous with other sockets
        !            39: in a communications domain, accepting connections from these
        !            40: sockets or exchanging messages with them.  These operations model
        !            41: a labeled or unlabeled communications graph, and can be used in a
        !            42: wide variety of communications domains.  Sockets can have different
        !            43: \fItypes\fP\| to provide different semantics of communication,
        !            44: increasing the flexibility of the model.
        !            45: .IP "Terminals and other devices
        !            46: .br
        !            47: Devices include
        !            48: terminals, providing input editing and interrupt generation
        !            49: and output flow control and editing, magnetic tapes,
        !            50: disks and other peripherals.  They often support the generic
        !            51: \fIread\fP and \fIwrite\fP operations as well as a number of \fIioctl\fP\|s.
        !            52: .IP "Processes
        !            53: .br
        !            54: Process descriptors provide facilities for control and debugging of
        !            55: other processes.
        !            56: .ds ss 2

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