245 lines
4.0 KiB
HTML
245 lines
4.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
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<HTML
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><HEAD
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><TITLE
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>non-buffered I/O</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
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REL="HOME"
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TITLE="libEtPan! API"
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HREF="book1.htm"><LINK
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REL="UP"
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TITLE="Tools and datatypes"
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HREF="c16.htm"><LINK
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REL="PREVIOUS"
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TITLE="Buffered I/O"
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HREF="x229.htm"><LINK
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REL="NEXT"
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TITLE="strings"
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HREF="x312.htm"></HEAD
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><BODY
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CLASS="SECT1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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SUMMARY="Header navigation table"
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BORDER="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>libEtPan! API</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="x229.htm"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 2. Tools and datatypes</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="x312.htm"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="MAILSTREAM-LOW"
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>non-buffered I/O</A
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></H1
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><PRE
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CLASS="PROGRAMLISTING"
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>
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#include <libetpan/libetpan.h>
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struct mailstream_low_driver {
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ssize_t (* mailstream_read)(mailstream_low *, void *, size_t);
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ssize_t (* mailstream_write)(mailstream_low *, void *, size_t);
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int (* mailstream_close)(mailstream_low *);
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int (* mailstream_get_fd)(mailstream_low *);
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void (* mailstream_free)(mailstream_low *);
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};
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typedef struct mailstream_low_driver mailstream_low_driver;
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struct _mailstream_low {
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void * data;
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mailstream_low_driver * driver;
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};
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</PRE
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><P
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> <B
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CLASS="COMMAND"
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>mailstream_low</B
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> is a non-buffered stream.
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</P
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><P
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> The <B
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CLASS="COMMAND"
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>mailstream_low_driver</B
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> is a set of
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functions used to access the stream.
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</P
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><P
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></P
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><UL
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><LI
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><P
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> <B
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CLASS="COMMAND"
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>mailstream_read/write/close()</B
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> is the same
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interface as <B
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CLASS="COMMAND"
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>read/write/close()</B
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>
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system calls, except that the file descriptor is replaced with the
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<B
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CLASS="COMMAND"
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>mailstream_low</B
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> structure.
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</P
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></LI
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><LI
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><P
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> <B
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CLASS="COMMAND"
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>mailstream_get_fd()</B
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> returns the file
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descriptor used for this non-buffered stream.
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</P
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></LI
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><LI
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><P
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> <B
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CLASS="COMMAND"
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>mailstream_free()</B
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> is in charge to free
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the internal structure of the mailstream_low and the
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mailstream_low itself.
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</P
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></LI
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></UL
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><PRE
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CLASS="PROGRAMLISTING"
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>
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mailstream_low * mailstream_low_new(void * data,
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mailstream_low_driver * driver);
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</PRE
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><P
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> mailstream_low_new() creates a low-level mailstream with the
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given internal structure (data) and using the given set of
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functions (driver).
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</P
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><PRE
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CLASS="PROGRAMLISTING"
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>
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ssize_t mailstream_low_write(mailstream_low * s, void * buf, size_t count);
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ssize_t mailstream_low_read(mailstream_low * s, void * buf, size_t count);
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int mailstream_low_close(mailstream_low * s);
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int mailstream_low_get_fd(mailstream_low * s);
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void mailstream_low_free(mailstream_low * s);
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</PRE
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><P
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> Each of these calls will call the corresponding function defined
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in the driver.
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</P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="x229.htm"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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HREF="book1.htm"
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ACCESSKEY="H"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="x312.htm"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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><TR
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><TD
|
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WIDTH="33%"
|
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ALIGN="left"
|
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VALIGN="top"
|
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>Buffered I/O</TD
|
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><TD
|
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="c16.htm"
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ACCESSKEY="U"
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>Up</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
|
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>strings</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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> |