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Annotation of 43BSDReno/share/doc/ps1/06.sysman/2.0.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: .\"    @(#)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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