dtrace discuss - Apr 2008 - User Function Boundary Tracing - indentation messed up

Hi All,

I am just beginning with DTrace. Trying to get trace log of my testing program I
am getting wrong indentation in trace log when I use sleep() call in my program.
Dtrace script I have is as follow:

#!/usr/sbin/dtrace -qs
#pragma D option flowindent

pid$1::fce1:entry,
pid$1::fce1:return
{
printf("\n"); /* dont know why but without that I am getting all
output on single line. In official wiki example there is no printf */
}


And my test C program is: 

int fce1(int x) {

  //  sleep(1);  /* if I uncomment this line, trace log output is messed up - it
is flat. Otherwise trace output log is correct. */
  write(1,"a",1);
  if (x > 15)
    return 0;
  else {
    fce1(x+1);
  }
  return 0;
}

int main() {
  while(1) {
    fce1(1);
  }
}


Doesn''t anybody know what I am doing wrong ? 
thanks for answer

> I am just beginning with DTrace. Trying to get trace log of my testing
program I am getting wrong indentation in trace log when I use sleep() call in
my program. Dtrace script I have is as follow:
> 
> #!/usr/sbin/dtrace -qs
> #pragma D option flowindent
> 
> pid$1::fce1:entry,
> pid$1::fce1:return
> {
> printf("\n"); /* dont know why but without that I am getting all
output on single line. In official wiki example there is no printf */
> }
> 
> 
> And my test C program is: 
> 
> int fce1(int x) {
> 
>   //  sleep(1);  /* if I uncomment this line, trace log output is messed up
- it is flat. Otherwise trace output log is correct. */
>   write(1,"a",1);
>   if (x > 15)
>     return 0;
>   else {
>     fce1(x+1);
>   }
>   return 0;
> }
> 
> int main() {
>   while(1) {
>     fce1(1);
>   }
> }
> 
> 
> Doesn''t anybody know what I am doing wrong ? 
It''s the presence of "-q" on your
"#!/usr/sbin/dtrace" line that''s screwing
you up -- "flowindent" and "quiet" aren''t really
meant to go together.
(And yes, there should arguably be either an explicit failure here, or
better behavior...)

	- Bryan

--------------------------------------------------------------------------
Bryan Cantrill, Sun Microsystems Fishworks.       http://blogs.sun.com/bmc

> It''s the presence of "-q" on your
"#!/usr/sbin/dtrace" line that''s screwing
> you up -- "flowindent" and "quiet" aren''t
really meant to go together.
> (And yes, there should arguably be either an explicit failure here, or
> better behavior...)
> 
> 	- Bryan
Hi Bryan,

I removed -q from that but the output behavior is exactly the same - sleep()
causes trace log to be flat.

J.