Unbuffered IO

Ruby
1

Hi,

this used to work in an older version/environment:

I read from a usb joystick:

irb(main):001:0> f = File.new “/dev/input/event0”
=> #<File:/dev/input/event0>
irb(main):002:0> i=0
=> 0
irb(main):003:0> loop { a = f.read 8 ; puts [i,a.inspect].join( “–”)
; i += 1 }
0–"\342\252\213E\315\363\000\000"
…
7–"\000\000\000\000\000\000\000\000"
[wait]

When I press the buttons on the device I get the output
8-line-wise, that is 64 bytes at a time. So I try:

irb(main):001:0> f = File.new “/dev/input/event0”
=> #<File:/dev/input/event0>
irb(main):002:0> f.sysread 8
Errno::EINVAL: Invalid argument - /dev/input/event0
from (irb):2:in `sysread’
from (irb):2
from :0

What does this mean and how could I get around it?

Thanks in advance.

Bertram

2

Hi,

Am Freitag, 22. Dez 2006, 19:41:00 +0900 schrieb Bertram S.:

I read from a usb joystick:

irb(main):001:0> f = File.new “/dev/input/event0”
=> #<File:/dev/input/event0>

I confused event interface and joystick interface.

Please don’t answer on this stupid question.

Bertram