On Thu, Sep 17, 2009 at 9:17 AM, Eugenias <redtigra...@gmail.com> wrote:
> Hi,
>
> I'm a nub in dtrace, could you please help me to find the mistake?
>
> I need to implement the logic:
>
> - if PID and TID are defined, fire the probe for the particular thread of
> particular process;
> - if only PID is defined, fire the probe for the process including all
> threads.
>
> The predicat [i]syscall:::entry / (pid == PID && tid == TID )[/i] / works ok
> and return syscall for PID/TID process only.
>
> Then I set a predicat:
>
> [i] syscall:::entry
> /(pid == PID && tid == TID) ||
> pid == PID/[/i]
>
> and it works for the whole process, as if I set only / pid == PID/.
> What am I missing?
I'm a little bit confused about what you want to do. If you want to
perform one set of actions if the tid matches and a different set of
actions if it doesn't, you want this:
syscall:::entry
/ pid == PID && tid == TID /
{
[ one set of actions ]
}
syscall:::entry
/ pid == PID && tid != TID /
{
[ a different set of actions ]
}
If you want to perform one set of actions no matter the tid and an
additional set of actions if the tid matches, you want this:
syscall:::entry
/ pid == PID /
{
[ one set of actions ]
}
syscall:::entry
/ pid == PID && tid == TID /
{
[ additional set of actions ]
}
(It's probably worth noting that "/ (pid == PID && tid == TID) || pid
== PID /" is logically equivalent to "/ pid == PID /".)
Chad
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