struct termios/termios2 rationale and usage

[Tilman Schmidt <tilman@imap.cc>]

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I'm currently trying to conceive of a way to portably use the "new"
(relatively) way of setting serial line bit rates via BOTHER and
c_ispeed/c_ospeed from a userspace utility. (ldattach(1), to be
included in the next release of util_linux_ng, in case you're
interested.) I notice that most architectures have introduced
new ioctls (TCGETS2 etc.) and struct termios2 for that, while some
(eg. powerpc) have integrated the c_ispeed/c_ospeed fields in
struct termios and supposedly get/set them via the old "non-2"
ioctls.

What's the rationale behind this? What is the recommended usage
for a Linux userspace program wanting to use the BOTHER speed
setting mechanism on a variety of architectures?

Thanks,
Tilman

-- 
Tilman Schmidt                    E-Mail: tilman@imap.cc
Bonn, Germany
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