dtrace discuss - Jun 2008 - include files and common initialisations

Hi,
In MySQL Cluster we have a DTrace probe for signals and signals have  
numbers which
is the parameter to the DTrace scripts.

However for the use of the scripts it would be very nice to have the  
name of the signal instead.
So to do this I can obviously initialise an array at BEGIN.

However if I want to share this very long initialisation statement in  
many scripts is there a simple
way of doing that. Also can one have several probes on the same entry?

Rgrds Mikael

Hi,

[...]
> So to do this I can obviously initialise an array at BEGIN. However if
> I want to share this very long initialisation statement in  many
> scripts is there a simple way of doing that.
Yes, dtrace can use C preprocessor.

============================== dtrace(1M) =============================     -C

         Run the C preprocessor cpp(1)  over  D  programs  before
         compiling them. You can pass options to the C preproces-
         sor using the -D, -U, -I, and -H options. You can select
         the  degree  of C standard conformance if you use the -X
         option. For a description of the set of  tokens  defined
         by  the D compiler when invoking the C preprocessor, see
         -X.
=======================================================================
==================================== test.d
===================================#include "init.d"
===============================================================================
==================================== init.d
===================================BEGIN {
        printf ("Doing init\n");
}
===============================================================================

$ dtrace -C -I. -s test.d
dtrace: script ''test.d'' matched 1 probe
CPU     ID                    FUNCTION:NAME
  0      1                           :BEGIN Doing init


I also thought that you could have the parameters in the first line of the
script, such as

#!/usr/sbin/dtrace -C -I. -s
...

But it does not work for me. And there is also no pragma for that. So
the only choice would be to wrap the D script into shell script, I''m
afraid.

> Also can one have several probes on the same entry?
Yes

HTH
-- 
	Vlad
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On Fri, Jun 06, 2008 at 12:43:56PM +0200, Mikael Ronstr?m
wrote:
> Hi,
> In MySQL Cluster we have a DTrace probe for signals and signals have  
> numbers which
> is the parameter to the DTrace scripts.
> 
> However for the use of the scripts it would be very nice to have the  
> name of the signal instead.
> So to do this I can obviously initialise an array at BEGIN.
> 
> However if I want to share this very long initialisation statement in  
> many scripts is there a simple
> way of doing that. Also can one have several probes on the same entry?
> 
> Rgrds Mikael
FYI, we already provide all Solaris signal names in /usr/lib/dtrace/signal.d
which is included by default.  So you can use signal names as identifiers.

Example:

# dtrace -qn ''BEGIN{printf("%d", SIGKILL);exit(0);}''
9

-Mike

-- 
Mike Shapiro, Sun Microsystems Fishworks. blogs.sun.com/mws/