Date: Mon, 2 Mar 2020 21:37:34 +0530 From: Kamal Prasad <kamalpr@gmail.com> To: Ash Gokhale <ashfixit@gmail.com> Cc: kamalp@acm.org, freebsd-dtrace@freebsd.org Subject: Re: set argument Message-ID: <0852C183-1EC6-4B19-A947-65C8669708C5@gmail.com> In-Reply-To: <CAHpe%2B0ZxJiy3MXnRPQqDDv7=%2By0LPwoCnE6Tgg6bYVYwZs7MXQ@mail.gmail.com> References: <CAK=yUGL8Ls5V4E=ucPJ9Unvf_UhDDngU7ue%2BkeRL3Zx2khJw5Q@mail.gmail.com> <CAHpe%2B0ZxJiy3MXnRPQqDDv7=%2By0LPwoCnE6Tgg6bYVYwZs7MXQ@mail.gmail.com>
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Is it possible to include the header ind race so that I don=E2=80=99t =
replicate structure definition?
> On Mar 2, 2020, at 9:28 PM, Ash Gokhale <ashfixit@gmail.com> wrote:
>=20
>>=20
>>=20
>> How does dtrace access the argument type declarations when we define =
a new
>> SDT? eg:- I define an SDT that has arg0 as (struct mystrust*)
>>=20
>> I have defined in my proprietary header file
>> ---------------
>> ...
>>=20
>> I want my probe to be able to access the typedeffor struct abc and =
struct
>>=20
>>=20
> To access yourSDT arg struct as a cooked object you may have to =
include
> fragments of your header including the srtuct in your dtrace script =
and
> perhaps a copyin() to get it into kernel memory:
>=20
> #!/sbin/dtrace -s
> struct {
> int code;
> void* location;
> char* description
> } err_desc_s;
>=20
> pid$target:::myERRORprobe
> {
> this->f =3D(struct err_desc_s*) copyin( arg1, sizeof ( err_desc_s));
> print( this->f);
> }
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