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comp.lang.ruby

Unbuffered IO

Bertram Scharpf

12/22/2006 10:41:00 AM

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


--
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-...
1 Answer

Bertram Scharpf

12/22/2006 11:47:00 AM

0

Hi,

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


--
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-...