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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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><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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1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
5			`<!-- http://www.opencontent.org/openpub/). -->`
6			`<!-- Distribution of the work or derivative of the work in any -->`
7			`<!-- standard (paper) book form is prohibited unless prior -->`
8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>Introduction</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
14			`<META`
15			`NAME="GENERATOR"`
16			`CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+`
17			`"><LINK`
18			`REL="HOME"`
19			`TITLE="eCos Reference Manual"`
20			`HREF="ecos-ref.html"><LINK`
21			`REL="UP"`
22			`TITLE="File System Support Infrastructure"`
23			`HREF="fileio.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="File System Support Infrastructure"`
26			`HREF="fileio.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="File System Table"`
29			`HREF="fileio-fstab.html"></HEAD`
30			`><BODY`
31			`CLASS="CHAPTER"`
32			`BGCOLOR="#FFFFFF"`
33			`TEXT="#000000"`
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35			`VLINK="#840084"`
36			`ALINK="#0000FF"`
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38			`CLASS="NAVHEADER"`
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42			`BORDER="0"`
43			`CELLPADDING="0"`
44			`CELLSPACING="0"`
45			`><TR`
46			`><TH`
47			`COLSPAN="3"`
48			`ALIGN="center"`
49			`>eCos Reference Manual</TH`
50			`></TR`
51			`><TR`
52			`><TD`
53			`WIDTH="10%"`
54			`ALIGN="left"`
55			`VALIGN="bottom"`
56			`><A`
57			`HREF="fileio.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`></TD`
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69			`VALIGN="bottom"`
70			`><A`
71			`HREF="fileio-fstab.html"`
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76			`></TABLE`
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78			`ALIGN="LEFT"`
79			`WIDTH="100%"></DIV`
80			`><DIV`
81			`CLASS="CHAPTER"`
82			`><H1`
83			`><A`
84			`NAME="FILEIO-INTRO">Chapter 19. Introduction</H1`
85			`><P`
86			`>This document describes the filesystem infrastructure provided in`
87			`eCos. This is implemented by the FILEIO package and provides POSIX`
88			`compliant file and IO operations together with the BSD socket`
89			`API. These APIs are described in the relevant standards and original`
90			`documentation and will not be described here. See <A`
91			`HREF="posix-standard-support.html"`
92			`>Chapter 31</A`
93			`> for details of which parts of the`
94			`POSIX standard are supported.</P`
95			`><P`
96			`>This document is concerned with the interfaces presented to client`
97			`filesystems and network protocol stacks.</P`
98			`><P`
99			`>The FILEIO infrastructure consist mainly of a set of tables containing`
100			`pointers to the primary interface functions of a file system. This`
101			`approach avoids problems of namespace pollution (for example several`
102			`filesystems can have a function called <TT`
103			`CLASS="FUNCTION"`
104			`>read()</TT`
105			`>, so long as they are`
106			`static). The system is also structured to eliminate the need for`
107			`dynamic memory allocation.</P`
108			`><P`
109			`>New filesystems can be written directly to the interfaces described`
110			`here. Existing filesystems can be ported very easily by the`
111			`introduction of a thin veneer porting layer that translates FILEIO`
112			`calls into native filesystem calls. </P`
113			`><P`
114			`>The term filesystem should be read fairly loosely in this`
115			`document. Object accessed through these interfaces could equally be`
116			`network protocol sockets, device drivers, fifos, message queues or any`
117			`other object that can present a file-like interface.</P`
118			`></DIV`
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120			`CLASS="NAVFOOTER"`
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139			`><TD`
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146			`>Home</A`
147			`></TD`
148			`><TD`
149			`WIDTH="33%"`
150			`ALIGN="right"`
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152			`><A`
153			`HREF="fileio-fstab.html"`
154			`ACCESSKEY="N"`
155			`>Next</A`
156			`></TD`
157			`></TR`
158			`><TR`
159			`><TD`
160			`WIDTH="33%"`
161			`ALIGN="left"`
162			`VALIGN="top"`
163			`>File System Support Infrastructure</TD`
164			`><TD`
165			`WIDTH="34%"`
166			`ALIGN="center"`
167			`VALIGN="top"`
168			`><A`
169			`HREF="fileio.html"`
170			`ACCESSKEY="U"`
171			`>Up</A`
172			`></TD`
173			`><TD`
174			`WIDTH="33%"`
175			`ALIGN="right"`
176			`VALIGN="top"`
177			`>File System Table</TD`
178			`></TR`
179			`></TABLE`
180			`></DIV`
181			`></BODY`
182			`></HTML`
183			`>`

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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [ref/] [fileio-intro.html] - Blame information for rev 174