by Apologies if this is a really stupid problem, but I'm no wizzard and its
got me stumped.
I have recently had to modify some code for reading two devices connected to
the serial ports on a PS/2 running AIX. The code uses the low level open,
and read commands to set up and read from the ports (well setup with IOCTL).
One device (a grain analyser) is connected at 1200 baud, the other (a weigh-
bridge) ate 4800 baud. The code is linked to a database which is running as
two processes, one reading each device. Data from the 1200 baud device is
being lost as it appears not to be buffered. I tried changing to use higher
level fget and fopen which I thought were buffered but still no luck. They
even fail when used in two small programs running in the background, do to
much and the 1200 device drops characters. Getty's are disabled in
/etc/inittab fro the two ports for what its worth.
Any ideas on where I'm going wrong? This is bugging the hell out of me, as
it's obviously a pretty simple stuff up on my part, oh yeah catting from the
devices never seems to drop characters no matter how much processing is
going on and how lower priority I run the cat at.
Many Thanks,
Rob.
--
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Robert Alley | See the stars come falling down from the sky
GIS Honours Student | Gently passing, they kiss your tears as you cry
Curtin Uni. Bentley WA | See the wind come softly blow your hair from
Australia | your face
| Still I'm sad, Still I'm sad
| (Samwell-Smith/McCarthy)
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