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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>non-buffered I/O</TITLE
><META
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><DIV
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><TR
><TH
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>libEtPan! API</TH
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><A
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>Prev</A
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>Chapter 2. Tools and datatypes</TD
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><HR
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><DIV
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><H1
CLASS="SECT1"
><A
NAME="MAILSTREAM-LOW"
>non-buffered I/O</A
></H1
><PRE
CLASS="PROGRAMLISTING"
>      
#include &lt;libetpan/libetpan.h&gt;

struct mailstream_low_driver {
  ssize_t (* mailstream_read)(mailstream_low *, void *, size_t);
  ssize_t (* mailstream_write)(mailstream_low *, void *, size_t);
  int (* mailstream_close)(mailstream_low *);
  int (* mailstream_get_fd)(mailstream_low *);
  void (* mailstream_free)(mailstream_low *);
};

typedef struct mailstream_low_driver mailstream_low_driver;

struct _mailstream_low {
  void * data;
  mailstream_low_driver * driver;
};
        </PRE
><P
>        <B
CLASS="COMMAND"
>mailstream_low</B
> is a non-buffered stream.
      </P
><P
>        The <B
CLASS="COMMAND"
>mailstream_low_driver</B
> is a set of
        functions used to access the stream.
      </P
><P
></P
><UL
><LI
><P
>            <B
CLASS="COMMAND"
>mailstream_read/write/close()</B
> is the same
            interface as <B
CLASS="COMMAND"
>read/write/close()</B
>
            system calls, except that the file descriptor is replaced with the
            <B
CLASS="COMMAND"
>mailstream_low</B
> structure.
          </P
></LI
><LI
><P
>            <B
CLASS="COMMAND"
>mailstream_get_fd()</B
> returns the file
            descriptor used for this non-buffered stream.
          </P
></LI
><LI
><P
>            <B
CLASS="COMMAND"
>mailstream_free()</B
> is in charge to free
            the internal structure of the mailstream_low and the
            mailstream_low itself.
          </P
></LI
></UL
><PRE
CLASS="PROGRAMLISTING"
>      
mailstream_low * mailstream_low_new(void * data,
    mailstream_low_driver * driver);
      </PRE
><P
>        mailstream_low_new() creates a low-level mailstream with the
        given internal structure (data) and using the given set of
        functions (driver).
      </P
><PRE
CLASS="PROGRAMLISTING"
>      
ssize_t mailstream_low_write(mailstream_low * s, void * buf, size_t count);

ssize_t mailstream_low_read(mailstream_low * s, void * buf, size_t count);

int mailstream_low_close(mailstream_low * s);

int mailstream_low_get_fd(mailstream_low * s);

void mailstream_low_free(mailstream_low * s);
      </PRE
><P
>        Each of these calls will call the corresponding function defined
        in the driver.
      </P
></DIV
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>