shmem instead of findsharedmemory, and allow force posix shmem build option

src/drv/gpstime/Makefile

@@ -26,6 +26,8 @@ INSTDIR		:= /lib/modules/$(KVER)/extra
 
 SYMVERSDIR	:= /var/cache/$(MODULENAME)
 
+SUDO_USER?= controls
+
 obj-m += $(MODULENAME).o
 $(MODULENAME)-y := $(MODULENAME)_core.o 
 $(MODULENAME)-y += ../../include/drv/spectracomGPS.o
@@ -57,7 +59,7 @@ install:
 	    rm -f /dev/$(MODULENAME) ; \
 	fi
 	mknod /dev/$(MODULENAME) c `grep $(MODULENAME) /proc/devices|awk '{print $$1}'` 0
-	chown controls /dev/$(MODULENAME)
+	chown $(SUDO_USER) /dev/$(MODULENAME)
 	# save Module.symvers if possible
 	mkdir -p $(SYMVERSDIR) || true
 	if [ -w $(SYMVERSDIR) ]; then cp Module.symvers $(SYMVERSDIR); fi