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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
<!-- This material may be distributed only subject to the terms      -->
<!-- and conditions set forth in the Open Publication License, v1.0  -->
<!-- or later (the latest version is presently available at          -->
<!-- http://www.opencontent.org/openpub/).                           -->
<!-- Distribution of the work or derivative of the work in any       -->
<!-- standard (paper) book form is prohibited unless prior           -->
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<HTML
><HEAD
><TITLE
>Devices</TITLE
><meta name="MSSmartTagsPreventParsing" content="TRUE">
<META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
REL="HOME"
TITLE="eCos Reference Manual"
HREF="ecos-ref.html"><LINK
REL="UP"
TITLE="File System Support Infrastructure"
HREF="fileio.html"><LINK
REL="PREVIOUS"
TITLE="Select"
HREF="fileio-select.html"><LINK
REL="NEXT"
TITLE="Writing a New Filesystem"
HREF="fileio-writing.html"></HEAD
><BODY
CLASS="CHAPTER"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>eCos Reference Manual</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="fileio-select.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="fileio-writing.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="CHAPTER"
><H1
><A
NAME="FILEIO-DEVICES">Chapter 28. Devices</H1
><P
>Devices are accessed by means of a pseudo-filesystem, &quot;devfs&quot;, that is
mounted on &quot;/dev&quot;. Open operations are translated into calls to
<TT
CLASS="FUNCTION"
>cyg_io_lookup()</TT
> and if successful result in a file object whose
<TT
CLASS="STRUCTFIELD"
><I
>f_ops</I
></TT
> functions translate filesystem API functions into calls into
the device API.</P
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="fileio-select.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="ecos-ref.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="fileio-writing.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Select</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="fileio.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Writing a New Filesystem</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>

Line No.	Rev	Author	Line
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			`>Devices</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="Select"`
26			`HREF="fileio-select.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="Writing a New Filesystem"`
29			`HREF="fileio-writing.html"></HEAD`
30			`><BODY`
31			`CLASS="CHAPTER"`
32			`BGCOLOR="#FFFFFF"`
33			`TEXT="#000000"`
34			`LINK="#0000FF"`
35			`VLINK="#840084"`
36			`ALINK="#0000FF"`
37			`><DIV`
38			`CLASS="NAVHEADER"`
39			`><TABLE`
40			`SUMMARY="Header navigation table"`
41			`WIDTH="100%"`
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-select.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`></TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
69			`VALIGN="bottom"`
70			`><A`
71			`HREF="fileio-writing.html"`
72			`ACCESSKEY="N"`
73			`>Next</A`
74			`></TD`
75			`></TR`
76			`></TABLE`
77			`><HR`
78			`ALIGN="LEFT"`
79			`WIDTH="100%"></DIV`
80			`><DIV`
81			`CLASS="CHAPTER"`
82			`><H1`
83			`><A`
84			`NAME="FILEIO-DEVICES">Chapter 28. Devices</H1`
85			`><P`
86			`>Devices are accessed by means of a pseudo-filesystem, "devfs", that is`
87			`mounted on "/dev". Open operations are translated into calls to`
88			`<TT`
89			`CLASS="FUNCTION"`
90			`>cyg_io_lookup()</TT`
91			`> and if successful result in a file object whose`
92			`<TT`
93			`CLASS="STRUCTFIELD"`
94			`><I`
95			`>f_ops</I`
96			`></TT`
97			`> functions translate filesystem API functions into calls into`
98			`the device API.</P`
99			`></DIV`
100			`><DIV`
101			`CLASS="NAVFOOTER"`
102			`><HR`
103			`ALIGN="LEFT"`
104			`WIDTH="100%"><TABLE`
105			`SUMMARY="Footer navigation table"`
106			`WIDTH="100%"`
107			`BORDER="0"`
108			`CELLPADDING="0"`
109			`CELLSPACING="0"`
110			`><TR`
111			`><TD`
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113			`ALIGN="left"`
114			`VALIGN="top"`
115			`><A`
116			`HREF="fileio-select.html"`
117			`ACCESSKEY="P"`
118			`>Prev</A`
119			`></TD`
120			`><TD`
121			`WIDTH="34%"`
122			`ALIGN="center"`
123			`VALIGN="top"`
124			`><A`
125			`HREF="ecos-ref.html"`
126			`ACCESSKEY="H"`
127			`>Home</A`
128			`></TD`
129			`><TD`
130			`WIDTH="33%"`
131			`ALIGN="right"`
132			`VALIGN="top"`
133			`><A`
134			`HREF="fileio-writing.html"`
135			`ACCESSKEY="N"`
136			`>Next</A`
137			`></TD`
138			`></TR`
139			`><TR`
140			`><TD`
141			`WIDTH="33%"`
142			`ALIGN="left"`
143			`VALIGN="top"`
144			`>Select</TD`
145			`><TD`
146			`WIDTH="34%"`
147			`ALIGN="center"`
148			`VALIGN="top"`
149			`><A`
150			`HREF="fileio.html"`
151			`ACCESSKEY="U"`
152			`>Up</A`
153			`></TD`
154			`><TD`
155			`WIDTH="33%"`
156			`ALIGN="right"`
157			`VALIGN="top"`
158			`>Writing a New Filesystem</TD`
159			`></TR`
160			`></TABLE`
161			`></DIV`
162			`></BODY`
163			`></HTML`
164			`>`

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