Messages in this thread | | | Date | Sat, 14 Dec 1996 22:15:24 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: Serial Patch |
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On Fri, 13 Dec 1996, Ion Badulescu wrote:
> > On Fri, 13 Dec 1996, Richard B. Johnson wrote: > > > /* > > > > I installed the latest tty patch. The call to open a non-existant > > terminal device no longer crashes. However, it now returns a valid > > handle even if the device does not exist. In this example, there > > are only TWO RS-232C ports on this machine! An attempt to open > > /dev/cua3 should return with -1 and the error set to something appropriate. > > Try 2.0.27 - it does exactly the same thing. > > > Ionut > Is it the correct behavior to return a valid handle on a non-existant device? I don't think so. Looking at the base address of the other possible UARTS show that a read returns 0xff. Looking at the ISR offset, a read also shows 0xff. The initialization code should, therefore, understand that there is no device at this address (I hope).
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