dtrace discuss - Jun 2009 - Modify the excname/fname of the Dtrace process?

I''d like to modify the executable name for the process that is running
Dtrace.  I have a Dtrace script running in the background all the time, and
would like to wipeout the ''dtrace -s ...'' and replace it with
a single string.

I''ve tried the following, which of course doesn''t work.  Can
this even be done?

#!/usr/sbin/dtrace -s

#pragma D option destructive
#pragma D option quiet

dtrace:::BEGIN
{
        self->parent = execname;
        self->mypid = curpsinfo->pr_pid;
        printf("Exec_name = %s   PID = %d\n", execname,
curpsinfo->pr_pid);

        copyoutstr("daemon", curpsinfo->pr_fname, 6);

        self->parent = execname;
        self->mypid = curpsinfo->pr_pid;
        printf("Exec_name = %s   PID = %d\n", execname,
curpsinfo->pr_pid);
}
-- 
This message posted from opensolaris.org

On Tue, Jun 16, 2009 at 12:23:46PM -0700, Shawn Clifford
wrote:
> I''d like to modify the executable name for the process that is
running
> Dtrace.  I have a Dtrace script running in the background all the
> time, and would like to wipeout the ''dtrace -s ...'' and
replace it
> with a single string.
>
> I''ve tried the following, which of course doesn''t work. 
Can this even
> be done?
> 
> #!/usr/sbin/dtrace -s
> 
> #pragma D option destructive
> #pragma D option quiet
> 
> dtrace:::BEGIN
> {
>         self->parent = execname;
>         self->mypid = curpsinfo->pr_pid;
>         printf("Exec_name = %s   PID = %d\n", execname,
curpsinfo->pr_pid);
> 
>         copyoutstr("daemon", curpsinfo->pr_fname, 6);
> 
>         self->parent = execname;
>         self->mypid = curpsinfo->pr_pid;
>         printf("Exec_name = %s   PID = %d\n", execname,
curpsinfo->pr_pid);
> }
Sorry, the execname is fixed in the kernel at exec(1M) time.  The best you
could do would be to make a hardlink or copy of /usr/sbin/dtrace, and change
your #! line to invoke that instead.

Cheers,
- jonathan