system tap unable to refer a structure definition

system tap unable to refer a structure definition

[Gadre Nayan]

Hi,

I am trying a script to read some headers which are passed from one module
to another.

c = @cast($frags[0]->f_addr, "volioship_hdr_t",
           "/root/ngadre/unixvm-cvs/src/common/kernel/vxvm/ioship_cvm.h")

printf("Arguments: [Frag[0]->size: %d, Frag[0]->f_addr: %u, Sender: %d,
Receiver: %d]\n",  $frags[0]->f_size, $frags[0]->f_a    ddr,
c->iosh_sender, c->iosh_receiver)

The header file is locally available on the machine.

Error Msg:

semantic error: type definition 'volioship_hdr_t' not found in
'/root/ngadre/unixvm-cvs/src/common/kernel/vxvm/ioship_cvm.h': operator
'@cast' at :46:6
        source:         c = @cast($frags[0]->f_addr, "volioship_hdr_t",
"/root/ngadre/unixvm-cvs/src/common/kernel/vxvm/ioship_cvm.h")


How do I make system tap refer to this structure.

Thanks
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system tap unable to refer a structure definition

[Frank Ch. Eigler]

gadrenayan wrote:

> [...]
> c = @cast($frags[0]->f_addr, "volioship_hdr_t", 
> "/root/ngadre/unixvm-cvs/src/common/kernel/vxvm/ioship_cvm.h")
> [...]
> The header file is locally available on the machine.
> [...]
> semantic error: type definition 'volioship_hdr_t' not found in '
> /root/ngadre/unixvm-cvs/src/common/kernel/vxvm/ioship_cvm.h': operator
> '@cast' at :46:6
> [...]
> How do I make system tap refer to this structure.

@cast requires use of the syntax "kernel<header.h>" to process such
files, because they involve different compiler invocations.  That may
not be all there is to it.  Rerun stap with --vp 04 or somesuch to
get some verbose tracing of its attempts to process that header.

- FChE