Kamailo - number of open files

Question

is there any possibility to track number of open files, which are used while Kamailio handle new calls? So far, I tried to use script in bash and start the script using watch command

FILES=$(ls -l '/proc/'$(pidof kamailio)'/fd' | wc -l)
echo $FILES >> FILES.txt

I got this kind of result:

ls: cannot access '1809' : No such file or directory
ls: cannot access '1808' : No such file or directory
ls: cannot access '1807' : No such file or directory
.
.
.
ls: cannot access '1795/fd' : No such file or directory

Answer 1

Since kamailio in most systems running under kamailio user, you can do something like this:

lsof -u kamailio | wc -l