dtrace discuss - May 2007 - printf( " %d " , *(uint32_t *) copyin ( arg0, n)) ??

Hello,
I don''t find a solution to my problem since we can''t use loops
with Dtrace: I want to print n values (given size) from a specific address.
If I ask printf( " %d " , *(uint32_t *) copyin ( addr, n )), it gives
me only 4 bytes,
if I ask printf( " %d " , *(unsigned char *) copyin ( addr, n )), it
gives me only 1 byte..
How could I obtain the n bytes?

Thank you for your answers it''s very important.
Fabien.
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This message posted from opensolaris.org

I am not sure what you are asking here. In the two printf statements, 
you are only asking for the number of bytes that it is printing.
In the first place, you told printf that you were printing an
unsigned 32 bit int, so it only printed 4 bytes. In the second
case you told printf that you wanted to print a char, so it printed
only one byte. I don''t see what the issue is. Are you saying that
you want to print a series of values?

Lafontaine wrote:
> Hello,
> I don''t find a solution to my problem since we can''t use
loops with Dtrace: I want to print n values (given size) from a specific
address.
> If I ask printf( " %d " , *(uint32_t *) copyin ( addr, n )), it
gives me only 4 bytes,
> if I ask printf( " %d " , *(unsigned char *) copyin ( addr, n )),
it gives me only 1 byte..
> How could I obtain the n bytes?
> 
> Thank you for your answers it''s very important.
> Fabien.
> --
> This message posted from opensolaris.org
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss at opensolaris.org
-- 
blu

"When Congress started Daylight Savings Time earlier, did
they even consider what affect an extra hour of daylight
would have on global warming? Well, did they?"
----------------------------------------------------------------------
Brian Utterback - Solaris RPE, Sun Microsystems, Inc.
Ph:877-259-7345, Em:brian.utterback-at-ess-you-enn-dot-kom

Hi Fabien,

If you want to trace a block of memory, you can do so with the tracemem()
action. If you have some array of variable length, you''ll have to do
something a bit more clever to print it such as unrolling what would
ideally be a loop or using a tick probe to print out entries periodically.

Adam

On Wed, May 09, 2007 at 05:56:49AM -0700, Lafontaine
wrote:
> Hello,
> I don''t find a solution to my problem since we can''t use
loops with Dtrace: I want to print n values (given size) from a specific
address.
> If I ask printf( " %d " , *(uint32_t *) copyin ( addr, n )), it
gives me only 4 bytes,
> if I ask printf( " %d " , *(unsigned char *) copyin ( addr, n )),
it gives me only 1 byte..
> How could I obtain the n bytes?
> 
> Thank you for your answers it''s very important.
> Fabien.
> --
> This message posted from opensolaris.org
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss at opensolaris.org
-- 
Adam Leventhal, Solaris Kernel Development       http://blogs.sun.com/ahl

Hello Adam,
ok it works with tracemem:
tracemem( copyin ( addr , n) , n );
does it look good?
another question: the result of tracemem give me (for n=10):

             0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f  0123456789abcdef
         0: b7 60 00 00 00 07 00 00 00 15                    .`........

Can I do something to just keep the values (b7 60 00 00 00 07 00 00 00 15) ?
Thank you very much.
Fabien.
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This message posted from opensolaris.org