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><A
NAME="MAILSTREAM-LOW"
>non-buffered I/O</A
></H1
><PRE
CLASS="PROGRAMLISTING"
>
#include <libetpan/libetpan.h>
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
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