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-NAME="FILEIO-INTRO">Chapter 19. Introduction</H1
-><P
->This document describes the filesystem infrastructure provided in
-eCos. This is implemented by the FILEIO package and provides POSIX
-compliant file and IO operations together with the BSD socket
-API. These APIs are described in the relevant standards and original
-documentation and will not be described here. See <A
-HREF="posix-standard-support.html"
->Chapter 31</A
-> for details of which parts of the
-POSIX standard are supported.</P
-><P
->This document is concerned with the interfaces presented to client
-filesystems and network protocol stacks.</P
-><P
->The FILEIO infrastructure consist mainly of a set of tables containing
-pointers to the primary interface functions of a file system. This
-approach avoids problems of namespace pollution (for example several
-filesystems can have a function called <TT
-CLASS="FUNCTION"
->read()</TT
->, so long as they are
-static). The system is also structured to eliminate the need for
-dynamic memory allocation.</P
-><P
->New filesystems can be written directly to the interfaces described
-here. Existing filesystems can be ported very easily by the
-introduction of a thin veneer porting layer that translates FILEIO
-calls into native filesystem calls. </P
-><P
->The term filesystem should be read fairly loosely in this
-document. Object accessed through these interfaces could equally be
-network protocol sockets, device drivers, fifos, message queues or any
-other object that can present a file-like interface.</P
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