open("/dev/ttyS1", O_LARGEFILE) blocks

From: Bernd Petrovitsch (bernd@gams.at)
Date: Mon Oct 14 2002 - 06:39:07 EST

Hi all!

Is is normal/correct/intended that an open() of /dev/ttyS1 blocks?
---- snip ----
{81}strace ./test-open /dev/ttyS0
[...]
open("/dev/ttyS0", O_RDONLY|O_NONBLOCK) = 3
close(3) = 0
open("/dev/ttyS0", O_RDONLY|O_NONBLOCK|O_LARGEFILE) = 3
close(3) = 0
open("/dev/ttyS0", O_RDONLY|O_LARGEFILE) = 3
close(3) = 0
_exit(0) = ?
{82}strace ./test-open /dev/ttyS1
[...]
open("/dev/ttyS1", O_RDONLY|O_NONBLOCK) = 3
close(3) = 0
open("/dev/ttyS1", O_RDONLY|O_NONBLOCK|O_LARGEFILE) = 3
close(3) = 0
open("/dev/ttyS1", O_RDONLY|O_LARGEFILE <unfinished ...>
{83}lsof /dev/ttyS0
{84}lsof /dev/ttyS1
{85}uname -a
Linux xxx 2.4.20-pre10aa1 #6 Fri Oct 11 13:41:20 CEST 2002 i686 unknown
---- snip ----

The second one was terminated with a Ctrl-C.
Nothing was connected to none of the ports.
Is there a reason that an open() on /dev/ttyS0 works and blocks
on /dev/ttyS1?

        Bernd 

-- 
Bernd Petrovitsch                              Email : bernd@gams.at
g.a.m.s gmbh                                  Fax : +43 1 205255-900
Prinz-Eugen-Straße 8                    A-1040 Vienna/Austria/Europe
                     LUGA : http://www.luga.at

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