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由 Denis Joseph Barrow 提交于
Makes TIOCM ioctls for Data Carrier Detect & related functions work like /drivers/serial/serial-core.c potentially needed for pppd & similar user programs. Signed-off-by: NDenis Joseph Barrow <D.Barow@option.com> Signed-off-by: NAlan Cox <alan@redhat.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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