TT#27201 restore reporting of number of running calls

Change-Id: I3a439b7b9f473b24e87a67f0b517f4c999c62324

debian/patches/series

@@ -27,3 +27,4 @@ build-fix-excludes.patch
 build-system-revamp.patch
 fix-build-with-newer-openssl.patch
 sipwise/0020-TT-9521-fix-200OK-without-SPD.patch
+sipwise/usage-reporting.patch

debian/patches/sipwise/usage-reporting.patch

@@ -0,0 +1,45 @@
+--- a/core/AmSession.cpp
++++ b/core/AmSession.cpp
+@@ -49,6 +49,9 @@
+ #include <unistd.h>
+ #include <assert.h>
+ #include <sys/time.h>
++#include <fcntl.h>
++#include <termios.h>
++#include <sys/ioctl.h>
+ 
+ volatile unsigned int AmSession::session_num = 0;
+ AmMutex AmSession::session_num_mut;
+@@ -494,6 +497,14 @@
+   return id;
+ }
+ /* bookkeeping functions - TODO: move to monitoring */
++static inline void __update_session_count(unsigned int num) {
++  int fd = open("/proc/ngcp/check", O_RDONLY);
++  if (fd >= 0) {
++      // set calls usage
++      ioctl(fd, TCXONC, (int) num);
++      close(fd);
++  }
++}
+ void AmSession::session_started() {
+   struct timeval now, delta;
+ 
+@@ -511,6 +522,8 @@
+   if(session_num > max_session_num) max_session_num = session_num;
+ 
+   session_num_mut.unlock();
++
++  __update_session_count(getSessionNum());
+ }
+ 
+ void AmSession::session_stopped() {
+@@ -524,6 +537,8 @@
+   //current session number
+   session_num--;
+   session_num_mut.unlock();
++
++  __update_session_count(getSessionNum());
+ }
+ 
+ unsigned int AmSession::getSessionNum() {