dtrace discuss - Dec 2010 - Escaping Special Characters in probe description and fullpath of module

Hi,

       Is there a escape charater to escape the appeareance of special 
characters like ''%''   appearing as a part of probemode or
probefunc.

For example,  I  the following  sample d-trace script which fails to 
compile because of  the special character ''%''.This is part of
the
libraryname ( /usr/lib/iconv/646%8859.so )

pid1061:646*%*8859.so::entry
{
   printf("%s|%d|%s|%s\n",execname,pid,probemod,probefunc);
}

When tried to run it fails with error "dtrace: failed to compile script 
/tmp/d-scripts/runscan_1061.d: line 8: syntax error near "%"

I tried using "\" to escape "%". But that didn''t
help.  How we handle
such cases?

Also, on an another note, how do we obtain the  fullpath of the library 
inside a d-script.  The "probemod"   by default retuurns the module
name
without the path. (libxyz.so)

Thanks
Vasanth



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Hey Vasanth,

You might try something like this:

pid1061:646?8859.so::entry
{
 ...
}

You might then his a problem in the pid provider itself; let me know
and we can work from there.

Adam

On Mon, Dec 27, 2010 at 6:35 AM, Vasanth Bhat <vasanth at sun.com>
wrote:
> Hi,
>
> ????? Is there a escape charater to escape the appeareance of special
> characters like ''%'' ? appearing as a part of probemode or
probefunc.
>
> For example,? I? the following? sample d-trace script which fails to
compile
> because of? the special character ''%''.This is part of the
libraryname (
> /usr/lib/iconv/646%8859.so )
>
> pid1061:646%8859.so::entry
> {
> ? printf("%s|%d|%s|%s\n",execname,pid,probemod,probefunc);
> }
>
> When tried to run it fails with error "dtrace: failed to compile
script
> /tmp/d-scripts/runscan_1061.d: line 8: syntax error near "%"
>
> I tried using "\" to escape "%". But that
didn''t help.? How we handle such
> cases?
>
> Also, on an another note, how do we obtain the? fullpath of the library
> inside a d-script.? The "probemod"?? by default retuurns the
module name
> without the path. (libxyz.so)
>
> Thanks
> Vasanth
>
>
>
>
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss at opensolaris.org
>


-- 
Adam Leventhal, Delphix ? ? ? ? ? ? ? ? ? ? ? ?http://dtrace.org/blogs/ahl

Thanks Adam.

That works. 

 Does this means  the probe will match for  not just "646%8859.so", 
but   also for  other module, like "646x8859.so" or 
"646a8859.so" etc.
Do I need to have the additional check for  the specific module in the 
predicate ( /probemod == "646%8859.so"/ )

Thanks
Vasanth
> Hey Vasanth,
>
> You might try something like this:
>
> pid1061:646?8859.so::entry
> {
>  ...
> }
>
> You might then his a problem in the pid provider itself; let me know
> and we can work from there.
>
> Adam
>
> On Mon, Dec 27, 2010 at 6:35 AM, Vasanth Bhat <vasanth at sun.com>
wrote:
>   
>> Hi,
>>
>>       Is there a escape charater to escape the appeareance of special
>> characters like ''%''   appearing as a part of
probemode or probefunc.
>>
>> For example,  I  the following  sample d-trace script which fails to
compile
>> because of  the special character ''%''.This is part of
the libraryname (
>> /usr/lib/iconv/646%8859.so )
>>
>> pid1061:646%8859.so::entry
>> {
>>   printf("%s|%d|%s|%s\n",execname,pid,probemod,probefunc);
>> }
>>
>> When tried to run it fails with error "dtrace: failed to compile
script
>> /tmp/d-scripts/runscan_1061.d: line 8: syntax error near "%"
>>
>> I tried using "\" to escape "%". But that
didn''t help.  How we handle such
>> cases?
>>
>> Also, on an another note, how do we obtain the  fullpath of the library
>> inside a d-script.  The "probemod"   by default retuurns the
module name
>> without the path. (libxyz.so)
>>
>> Thanks
>> Vasanth
>>
>>
>>
>>
>> _______________________________________________
>> dtrace-discuss mailing list
>> dtrace-discuss at opensolaris.org
>>
>>     
>
>
>
>   
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Hey Vasanth,

Correct; I should have mentioned that use of the globbing character means that
you could match other modules. As you say, using a predicate will protect you
against erroneous matches.

Adam

On Dec 28, 2010, at 3:52 AM, vasanth wrote:
> Thanks Adam.
> 
> That works.  
> 
> Does this means  the probe will match for  not just
"646%8859.so", but   also for  other module, like
"646x8859.so" or  "646a8859.so" etc.  Do I need to have the
additional check for  the specific module in the predicate ( /probemod ==
"646%8859.so"/ )
> 
> Thanks
> Vasanth
> 
>> Hey Vasanth,
>> 
>> You might try something like this:
>> 
>> pid1061:646?8859.so::entry
>> {
>> ...
>> }
>> 
>> You might then his a problem in the pid provider itself; let me know
>> and we can work from there.
>> 
>> Adam
>> 
>> On Mon, Dec 27, 2010 at 6:35 AM, Vasanth Bhat 
>> <vasanth at sun.com>
>> wrote:
>> 
>> 
>>> Hi,
>>> 
>>>      Is there a escape charater to escape the appeareance of
special
>>> characters like ''%''   appearing as a part of
probemode or probefunc.
>>> 
>>> For example,  I  the following  sample d-trace script which fails
to compile
>>> because of  the special character ''%''.This is
part of the libraryname (
>>> /usr/lib/iconv/646%8859.so )
>>> 
>>> pid1061:646%8859.so::entry
>>> {
>>>  printf("%s|%d|%s|%s\n",execname,pid,probemod,probefunc);
>>> }
>>> 
>>> When tried to run it fails with error "dtrace: failed to
compile script
>>> /tmp/d-scripts/runscan_1061.d: line 8: syntax error near
"%"
>>> 
>>> I tried using "\" to escape "%". But that
didn''t help.  How we handle such
>>> cases?
>>> 
>>> Also, on an another note, how do we obtain the  fullpath of the
library
>>> inside a d-script.  The "probemod"   by default retuurns
the module name
>>> without the path. (libxyz.so)
>>> 
>>> Thanks
>>> Vasanth
>>> 
>>> 
>>> 
>>> 
>>> _______________________________________________
>>> dtrace-discuss mailing list
>>> 
>>> dtrace-discuss at opensolaris.org
>>> 
>>> 
>>> 
>>> 
>> 
>> 
>> 
>> 
>> 
> 
-- 
Adam Leventhal, Delphix                        http://dtrace.org/blogs/ahl




-- 
Adam Leventhal, Delphix                        http://dtrace.org/blogs/ahl

Thanks Adam.

Is there  known list of other  special characters which needs to be 
handled this way.

Thanks
Vasanth
> Hey Vasanth,
>
> Correct; I should have mentioned that use of the globbing character means
that you could match other modules. As you say, using a predicate will protect
you against erroneous matches.
>
> Adam
>
> On Dec 28, 2010, at 3:52 AM, vasanth wrote:
>
>   
>> Thanks Adam.
>>
>> That works.  
>>
>>  Does this means  the probe will match for  not just
"646%8859.so", but   also for  other module, like
"646x8859.so" or  "646a8859.so" etc.  Do I need to have the
additional check for  the specific module in the predicate ( /probemod ==
"646%8859.so"/ )
>>
>> Thanks
>> Vasanth
>>
>>     
>>> Hey Vasanth,
>>>
>>> You might try something like this:
>>>
>>> pid1061:646?8859.so::entry
>>> {
>>>  ...
>>> }
>>>
>>> You might then his a problem in the pid provider itself; let me
know
>>> and we can work from there.
>>>
>>> Adam
>>>
>>> On Mon, Dec 27, 2010 at 6:35 AM, Vasanth Bhat 
>>> <vasanth at sun.com>
>>>  wrote:
>>>   
>>>
>>>       
>>>> Hi,
>>>>
>>>>       Is there a escape charater to escape the appeareance of
special
>>>> characters like ''%''   appearing as a part of
probemode or probefunc.
>>>>
>>>> For example,  I  the following  sample d-trace script which
fails to compile
>>>> because of  the special character ''%''.This is
part of the libraryname (
>>>> /usr/lib/iconv/646%8859.so )
>>>>
>>>> pid1061:646%8859.so::entry
>>>> {
>>>>  
printf("%s|%d|%s|%s\n",execname,pid,probemod,probefunc);
>>>> }
>>>>
>>>> When tried to run it fails with error "dtrace: failed to
compile script
>>>> /tmp/d-scripts/runscan_1061.d: line 8: syntax error near
"%"
>>>>
>>>> I tried using "\" to escape "%". But that
didn''t help.  How we handle such
>>>> cases?
>>>>
>>>> Also, on an another note, how do we obtain the  fullpath of the
library
>>>> inside a d-script.  The "probemod"   by default
retuurns the module name
>>>> without the path. (libxyz.so)
>>>>
>>>> Thanks
>>>> Vasanth
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> dtrace-discuss mailing list
>>>>
>>>> dtrace-discuss at opensolaris.org
>>>>
>>>>
>>>>     
>>>>
>>>>         
>>>
>>>   
>>>
>>>       
>
>   
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Hi Vasanth,

You can find it in the libdtrace parser:
??http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libdtrace/common/dt_lex.l#69

RGX_PSPEC	[-$:a-zA-Z_.?*\\\[\]!][-$:0-9a-zA-Z_.`?*\\\[\]!]*

That''s an initial -$:a-zA-Z_.?*\[]! and then after that those same
characters plus 0-9 and `.

Adam

On Wed, Dec 29, 2010 at 3:37 AM, vasanth <vasanth at sun.com>
wrote:
>
> Thanks Adam.
>
> Is there? known list of other? special characters which needs to be handled
this way.
>
> Thanks
> Vasanth
>
> Hey Vasanth,
>
> Correct; I should have mentioned that use of the globbing character means
that you could match other modules. As you say, using a predicate will protect
you against erroneous matches.
>
> Adam
>
> On Dec 28, 2010, at 3:52 AM, vasanth wrote:
>
>
>
> Thanks Adam.
>
> That works.
>
>  Does this means  the probe will match for  not just
"646%8859.so", but   also for  other module, like
"646x8859.so" or  "646a8859.so" etc.  Do I need to have the
additional check for  the specific module in the predicate ( /probemod ==
"646%8859.so"/ )
>
> Thanks
> Vasanth
>
>
>
> Hey Vasanth,
>
> You might try something like this:
>
> pid1061:646?8859.so::entry
> {
>  ...
> }
>
> You might then his a problem in the pid provider itself; let me know
> and we can work from there.
>
> Adam
>
> On Mon, Dec 27, 2010 at 6:35 AM, Vasanth Bhat
> <vasanth at sun.com>
>  wrote:
>
>
>
>
> Hi,
>
>       Is there a escape charater to escape the appeareance of special
> characters like ''%''   appearing as a part of probemode or
probefunc.
>
> For example,  I  the following  sample d-trace script which fails to
compile
> because of  the special character ''%''.This is part of the
libraryname (
> /usr/lib/iconv/646%8859.so )
>
> pid1061:646%8859.so::entry
> {
>   printf("%s|%d|%s|%s\n",execname,pid,probemod,probefunc);
> }
>
> When tried to run it fails with error "dtrace: failed to compile
script
> /tmp/d-scripts/runscan_1061.d: line 8: syntax error near "%"
>
> I tried using "\" to escape "%". But that
didn''t help.  How we handle such
> cases?
>
> Also, on an another note, how do we obtain the  fullpath of the library
> inside a d-script.  The "probemod"   by default retuurns the
module name
> without the path. (libxyz.so)
>
> Thanks
> Vasanth
>
>
>
>
> _______________________________________________
> dtrace-discuss mailing list
>
> dtrace-discuss at opensolaris.org
>
>
>
>
>
>
>
>
>
>
>


--
Adam Leventhal, Delphix ? ? ? ? ? ? ? ? ? ? ? ?http://dtrace.org/blogs/ahl

Thanks Adam.

--Vasanth
> Hi Vasanth,
>
> You can find it in the libdtrace parser:
>  
http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libdtrace/common/dt_lex.l#69
>
> RGX_PSPEC	[-$:a-zA-Z_.?*\\\[\]!][-$:0-9a-zA-Z_.`?*\\\[\]!]*
>
> That''s an initial -$:a-zA-Z_.?*\[]! and then after that those same
> characters plus 0-9 and `.
>
> Adam
>
> On Wed, Dec 29, 2010 at 3:37 AM, vasanth <vasanth at sun.com> wrote:
>   
>> Thanks Adam.
>>
>> Is there  known list of other  special characters which needs to be
handled this way.
>>
>> Thanks
>> Vasanth
>>
>> Hey Vasanth,
>>
>> Correct; I should have mentioned that use of the globbing character
means that you could match other modules. As you say, using a predicate will
protect you against erroneous matches.
>>
>> Adam
>>
>> On Dec 28, 2010, at 3:52 AM, vasanth wrote:
>>
>>
>>
>> Thanks Adam.
>>
>> That works.
>>
>>  Does this means  the probe will match for  not just
"646%8859.so", but   also for  other module, like
"646x8859.so" or  "646a8859.so" etc.  Do I need to have the
additional check for  the specific module in the predicate ( /probemod ==
"646%8859.so"/ )
>>
>> Thanks
>> Vasanth
>>
>>
>>
>> Hey Vasanth,
>>
>> You might try something like this:
>>
>> pid1061:646?8859.so::entry
>> {
>>  ...
>> }
>>
>> You might then his a problem in the pid provider itself; let me know
>> and we can work from there.
>>
>> Adam
>>
>> On Mon, Dec 27, 2010 at 6:35 AM, Vasanth Bhat
>> <vasanth at sun.com>
>>  wrote:
>>
>>
>>
>>
>> Hi,
>>
>>       Is there a escape charater to escape the appeareance of special
>> characters like ''%''   appearing as a part of
probemode or probefunc.
>>
>> For example,  I  the following  sample d-trace script which fails to
compile
>> because of  the special character ''%''.This is part of
the libraryname (
>> /usr/lib/iconv/646%8859.so )
>>
>> pid1061:646%8859.so::entry
>> {
>>   printf("%s|%d|%s|%s\n",execname,pid,probemod,probefunc);
>> }
>>
>> When tried to run it fails with error "dtrace: failed to compile
script
>> /tmp/d-scripts/runscan_1061.d: line 8: syntax error near "%"
>>
>> I tried using "\" to escape "%". But that
didn''t help.  How we handle such
>> cases?
>>
>> Also, on an another note, how do we obtain the  fullpath of the library
>> inside a d-script.  The "probemod"   by default retuurns the
module name
>> without the path. (libxyz.so)
>>
>> Thanks
>> Vasanth
>>
>>
>>
>>
>> _______________________________________________
>> dtrace-discuss mailing list
>>
>> dtrace-discuss at opensolaris.org
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>     
>
>
>
> --
> Adam Leventhal, Delphix                        http://dtrace.org/blogs/ahl
>   
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