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><A
NAME="NET-COMMON-SUPPORT">Chapter 37. Support Features</H1
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><DT
><A
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>TFTP</A
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><DIV
CLASS="SECT1"
><H1
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><A
NAME="NET-COMMON-TFTP">TFTP</H1
><P
>The TFTP client and server are described in
<TT
CLASS="FILENAME"
>tftp_support.h</TT
>;
the client API is simple and can be easily understood by reading
<TT
CLASS="FILENAME"
>tftp_client_test.c</TT
>.</P
><P
>The server is more complex. It requires a filesystem implementation
to be supplied by the user, and attached to the tftp server by means
of a vector of function pointers:</P
><TABLE
BORDER="5"
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WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>struct tftpd_fileops {
int (*open)(const char *, int);
int (*close)(int);
int (*write)(int, const void *, int);
int (*read)(int, void *, int);
};</PRE
></TD
></TR
></TABLE
><P
>These functions have the obvious semantics. The structure
describing the filesystem is an argument to the <TT
CLASS="FUNCTION"
>tftpd_start(int,
struct tftpd_fileops *);</TT
> call.
The first argument is the port to use for the server.</P
><P
>As discussed in the description of the tftp_server_test
above, an example filesystem is provided in
<TT
CLASS="FILENAME"
>net/common/<TT
CLASS="REPLACEABLE"
><I
>VERSION</I
></TT
>/src/tftp_dummy_file.c</TT
>
for
use by the tftp server test. The dummy filesystem is not a supported
part of the network stack, it exists purely for demonstration purposes.</P
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