[dtrace-discuss] dtrace syscall:::return arg0 weidness on b56 ( x86)

[Paul van der Zwan]

On 31-jan-2007, at 11:41, Casper.Dik at Sun.COM wrote:

>
>>
>> At the moment I am attending course SA327 ( dtrace)
>> and I am doing the excercises on my macbook running  b56 on  
>> parallels.
>>
>> In one excercise we have to list failing system calls using
>> a predicate: /arg0 == -1/ and this never matches on my system.
>> When I change the test into / arg0 == 429496729 / it matches.
>> On a Acer Ferrari running S10u3 the test for -1 works.
>>
>> Any idea if this is a bug in b56 or what it might be otherwise ??
>
> Are both running 64 bit kernels or is this 32 vs 64 bit?
>

32 bit, and I think I found the problem and answer in the mail  
archives..
You have to cat the arg0 on syscall:::return to int. On 64 bit it  
does not
matter on 32 bit it definitely does...
I'll have to file a bug on the training material as all their samples  
and
answers are missing the cast.

	Paul