Messages in this thread |  | | Date | Mon, 16 Jun 2008 11:13:29 +0100 | From | Alan Cox <> | Subject | Re: 2.6.25.3: serial problem (minicom) |
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> But, then, what is the relationship between CLOCAL and DTR/RTS supposed to > be? Presumably, it should prevent a SIGHUP from being raised when DSR > goes low, but beyond that, it all seems rather ill-defined. Throw in B0,
CLOCAL is defined to "ignore modem control lines"
> which the SUS strongly implies should unconditionally lower DTR and RTS, > and the CRTSCTS flag, and the waters really get murky. It looks to me > like the only thing you can say for certain is that CLOCAL will cause DSR > to be ignored...and for anything else you're on your own.
Whatever it implies the behaviour should not have changed between 2.6.24 and 2.6.25. Nobody AFAIK sat down and decided to change it.
> > Mind you, all this just suggests that POSIX kinda sucks, which is hardly > an earth-shattering revelation.
Standards are part written spec and a large part an existing tradition around that standard. The tradition is often the most important bit.
Alan
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