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+>eCos Reference Manual</TH
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+CLASS="CHAPTER"
+><H1
+><A
+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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+>
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