dtrace discuss - Aug 2008 - pid provider gives wrong output

Hi,

Having such dtrace scipt:

#pragma D option flowindent

pid$target:::entry,
pid$target:::return
{
}

and such c program: 

void main()
{
  int data[100];
  memmove(&data[5],&data[6],50);
  printf("end\n");
}

Everytime I call memmove I get strange "return from function" record
from memcpy call -this record does not have its "entering function"
part so I get something like this (also note strange indentation):

  1      -> memmove
  1      <- memmove
  1    <- memcpy


Is this a bug or am I missing something ?

Thanks J.

Searching for ''memmove memcpy dtrace'' turned up
Chad''s excellent blog post
on the subject:

  http://cmynhier.blogspot.com/2007/04/memmove-memcpy-and-dtrace.html

That should answer your question.

Adam

On Wed, Aug 06, 2008 at 06:39:45PM +0200, broker5 at seznam.cz
wrote:
> Hi,
> 
> Having such dtrace scipt:
> 
> #pragma D option flowindent
> 
> pid$target:::entry,
> pid$target:::return
> {
> }
> 
> and such c program: 
> 
> void main()
> {
>   int data[100];
>   memmove(&data[5],&data[6],50);
>   printf("end\n");
> }
> 
> Everytime I call memmove I get strange "return from function"
record from memcpy call -this record does not have its "entering
function" part so I get something like this (also note strange
indentation):
> 
>   1      -> memmove
>   1      <- memmove
>   1    <- memcpy
> 
> 
> Is this a bug or am I missing something ?
> 
> Thanks J.
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss at opensolaris.org
-- 
Adam Leventhal, Fishworks                     http://blogs.sun.com/ahl

Yes, it does :-) Many thanks

> Searching for ''memmove memcpy dtrace'' turned up
Chad''s excellent blog post
> on the subject:
> 
>   http://cmynhier.blogspot.com/2007/04/memmove-memcpy-and-dtrace.html
> 
> That should answer your question.
> 
> Adam
> 
> On Wed, Aug 06, 2008 at 06:39:45PM +0200, broker5 at seznam.cz wrote:
> > Hi,
> > 
> > Having such dtrace scipt:
> > 
> > #pragma D option flowindent
> > 
> > pid$target:::entry,
> > pid$target:::return
> > {
> > }
> > 
> > and such c program: 
> > 
> > void main()
> > {
> >   int data[100];
> >   memmove(&data[5],&data[6],50);
> >   printf("end\n");
> > }
> > 
> > Everytime I call memmove I get strange "return from
function" record from
> memcpy call -this record does not have its "entering function"
part so I get
> something like this (also note strange indentation):
> > 
> >   1      -> memmove
> >   1      <- memmove
> >   1    <- memcpy
> > 
> > 
> > Is this a bug or am I missing something ?
> > 
> > Thanks J.
> > _______________________________________________
> > dtrace-discuss mailing list
> > dtrace-discuss at opensolaris.org
> 
> -- 
> Adam Leventhal, Fishworks                     http://blogs.sun.com/ahl
> 
> 
>

Hi Adam,

when talking about wrong pid provider output do you think you could take a look
at my old thread here:

http://mail.opensolaris.org/pipermail/dtrace-discuss/2008-April/006027.html

I know Bryan answered but I still think there is problem or bug. 

Note that if I remove flowindent option and use my own printing (like
printf("<- %s\n",probefunc))
everything is working fine, so I think there is some bug in flowindent. Also I
asked friend to verify it
on his box to see where the problem is local for my box and he is experiencing
same problems.

Thanks Jcob 

> ------------ P?vodn? zpr?va ------------
> Od: Adam Leventhal <ahl at eng.sun.com>
> P?edm?t: Re: [dtrace-discuss] pid provider gives wrong output
> Datum: 06.8.2008 19:26:22
> ----------------------------------------
> Searching for ''memmove memcpy dtrace'' turned up
Chad''s excellent blog post
> on the subject:
> 
>   http://cmynhier.blogspot.com/2007/04/memmove-memcpy-and-dtrace.html
> 
> That should answer your question.
> 
> Adam
> 
> On Wed, Aug 06, 2008 at 06:39:45PM +0200, broker5 at seznam.cz wrote:
> > Hi,
> > 
> > Having such dtrace scipt:
> > 
> > #pragma D option flowindent
> > 
> > pid$target:::entry,
> > pid$target:::return
> > {
> > }
> > 
> > and such c program: 
> > 
> > void main()
> > {
> >   int data[100];
> >   memmove(&data[5],&data[6],50);
> >   printf("end\n");
> > }
> > 
> > Everytime I call memmove I get strange "return from
function" record from
> memcpy call -this record does not have its "entering function"
part so I get
> something like this (also note strange indentation):
> > 
> >   1      -> memmove
> >   1      <- memmove
> >   1    <- memcpy
> > 
> > 
> > Is this a bug or am I missing something ?
> > 
> > Thanks J.
> > _______________________________________________
> > dtrace-discuss mailing list
> > dtrace-discuss at opensolaris.org
> 
> -- 
> Adam Leventhal, Fishworks                     http://blogs.sun.com/ahl
> 
> 
>