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UUCP Internals Frequently Asked Questions
Section - UUCP `t' Protocol

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UUCP `t' Protocol
=================

The `t' protocol is intended for use on links which provide reliable
end-to-end connections, such as TCP.  It does no error checking or flow
control, and requires an eight bit clear channel.

I believe the `t' protocol originated in BSD versions of UUCP.

When a UUCP package transmits a command, it first gets the length of the
command string, C.  It then sends `((C / 512) + 1) * 512' bytes (the
smallest multiple of 512 which can hold C bytes plus a null byte)
consisting of the command string itself followed by trailing null bytes.

When a UUCP package sends a file, it sends it in blocks.  Each block
contains at most 1024 bytes of data.  Each block consists of four bytes
containing the amount of data in binary (most significant byte first,
the same format as used by the Unix function `htonl') followed by that
amount of data.  The end of the file is signalled by a block containing
zero bytes of data.

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Last Update March 27 2014 @ 02:12 PM