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Bug 10260 - fconfigure -mode doesn't work on serial port
fconfigure -mode doesn't work on serial port
Product: Red Hat Linux
Classification: Retired
Component: tcltk (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Jens Petersen
Depends On:
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Reported: 2000-03-20 06:28 EST by mbertani
Modified: 2008-05-01 11:37 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2000-03-20 08:41:23 EST
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Description mbertani 2000-03-20 06:28:28 EST
I run this script from tclsh:

set comPort "/dev/ttyS0"
set comId [open $comPort r+]
if {$comId == ""} {
	bgerror "Can't open $comPort"
	return -1

fconfigure $comId \
	-translation binary \
	-blocking 0 \
	-buffering none \
	-mode 115200,n,8,1

after 10000
close $comId

while the program is waiting in "after 10000" , through another shell I call

 stty -a -F /dev/ttyS0

and I see a completely different setting (the _real_ one!).

To solve the problem it was necessary to rebuild Tcl/Tk from Scriptics sources tar.gz
(8.3b2, the newest at this time).
In order to understand if the problem was a Tcl bug, I rebuilt also 8.0.5 sources, but
the behaviour is equal - it works.

Please note that I had the same problem also with previous versions (5.0) of RH linux.

Best Regards
Massimo Bertani
Comment 1 Jeff Johnson 2000-03-20 08:41:59 EST
The problem appears to be with the build of tcltk-8.0.5, which probably
was built against a glibc version that incorrectly defined higher baud
rates (I assume from reading your reported behavior).

Try tcltk-8.2.3-36 packages from Raw Hide, they have been built against
more recent glibc headers. (Note: tcltk cannot be upgraded to 8.3 until
all the components (e.g. tclx, itcl, expect, and tix have been ported to 8.3).

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