xcalloc
xcalloc(nelem, size)
xcalloc(size_t nElements, size_t size)
xcalloc(size_t i, size_t j)
xcalloc(size_t nbr, size_t size)
xcalloc(sysdem_ops_t *ops, size_t n, size_t elsize)
xcalloc(size_t size)
xcalloc(size_t nelem, size_t elsize)