[sr-dev] how to assign value to a pvar?

Daniel-Constantin Mierla miconda at gmail.com
Tue Nov 10 11:10:53 CET 2009

there is an example in group module - get_user_group() function.

However, you can do a new pseudo-variable:

$rr_count or so, where get function counts the number of routes.

The you do not need to use a function to set a variable, you can do:
$var(x) = $rr_count;


On 10.11.2009 4:47 Uhr, Juha Heinanen wrote:
> it was easy to write the code that counts the number of record routes in
> a message.  first i though that i can return the count as result of the
> script function, but that didn't work out because if script function
> returns 0, it will terminate execution of the script.
> so i though to give the function a pvar argument to which the count
> is stored, e.g.,
> rr_count("$var(count)");
> so far i have not been able to assign the count to the pvar argument and
> have already spent three hours on such a simple assignment statement.  in
> pvar.h there is function 
> int pv_set_spec_value(struct sip_msg* msg, pv_spec_p sp, int op,
> 		pv_value_t *value);
> that sounds like it might do the trick, but there is no documentation on
> op argument and i have not yet found in sr sources any place there that
> function is really used.  also i have not found in any of sr modules any
> script function that would assign something to a pvar argument?  is
> there one so that i could take a look or it that an impossible thing to
> do? 
> i have tried various versions, such as
>     pv_val.ri = count;
>     pv_val.flags = PV_VAL_INT;
>     if (_count) {
> 	if (pv_set_spec_value(msg, (pv_spec_t *)_count, EQ_T, &pv_val) == 0) {
> where _count is pvar fixed up argument of rr_count function, but no luck
> so far.  i just get
> Nov 10 05:42:51 localhost /usr/sbin/sip-proxy[27707]: ERROR: pv [pv_svar.c:117]: out of pkg mem!
> Nov 10 05:42:51 localhost /usr/sbin/sip-proxy[27707]: ERROR: pv [pv_core.c:1620]: error - cannot set svar [tmp] 
> can anyone help here?  if not, i'll have to make rr_count to return the
> actual count + 1 so that i can return it as result of the rr_count
> function.
> -- juha
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Daniel-Constantin Mierla
* http://www.asipto.com/

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