What is the exact equivalent of the following function for Ubuntu?
http://www.qnx.com/developers/docs/6.4.1/neutrino/lib_ref/e/endian_be16.html
What you need is:
#include <endian.h> result_in_host_endianness = be16toh(my_big_endian_number)
See http://man7.org/linux/man-pages/man3/endian.3.html