From: Roger Pack <rogerpack2005@...>
Date: 2009-06-10T07:07:48+09:00
Subject: Re: Errno::ENOMEM reading a device in Ruby, not in Java thou

> b = " "*65000
> a.read(b.size, b)
> 
> |>> a.read 65000
> |Errno::ENOMEM: Cannot allocate memory - /dev/nst2
> 
> Hmm, since read with number pre-allocate specified sized buffer, it
> should work.  Perhaps you have to use sysread instead of mere read,
> since read method retries until exact number of bytes specified read.
> 
>               matz.

Interesting.
with 1.9, it will read all 64K at once (not with 1.8 though--it reads 4K 
blocks until it reached 64K).

sysread did work with 1.8, though

for some reason I had to use exactly 64K block size.

 file.sysread(64*1024)

guess something to remember if you have to read from a tape drive.

I did notice a few of these when using 1.9

ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbfd172a8) = -1 ENOTTY 
(Inappropriate ioctl for device)

dunno if that's cause for concern or not.
Cheers!
-=r
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