Hey Vladimir,
You can't have multiple dtrace(1M) invocations that use the -p option
because each one will try to monitor and consume events about the
process's life-cycle such as loading modules and exiting. You can,
however, have multiple DTrace scripts that observe a process by using
the pid provider with that process's id or other providers with an
appropriate predicate.
Adam
On Dec 19, 2008, at 1:27 AM, Vladimir Kvashin wrote:
> Hi,
>
> Is it possible to attach dtrace to a single process twice or more
> times? (with different scripts)?
>
> Each time I tried, it fails with the message
> "failed to grab pid 13407: process is traced"
>
> I ended up with two simplest scripts
>
> dtrace -n 'END { printf("BYE"); }' -p 13407
> dtrace -n 'BEGIN { printf("Hi there"); }' -p 13407
>
> but they failed with the same message.
>
> Does this mean that it is impossible to attach several scripts to a
> single process?
> Or do I misunderstand something?
>
> Thank you,
> Vladimir
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--
Adam Leventhal, Fishworks http://blogs.sun.com/ahl
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