CHECK_ENV
CHECK_ENV("UNAME_s", &get_sysname, native_sysname, &sysname);
CHECK_ENV("UNAME_n", &get_hostname, native_hostname, &hostname);
CHECK_ENV("UNAME_r", &get_release, native_release, &release);
CHECK_ENV("UNAME_v", &get_version, native_version, &version);
CHECK_ENV("UNAME_m", &get_machine, native_machine, &machine);
CHECK_ENV("UNAME_p", &get_arch, native_arch, &arch);
CHECK_ENV("UNAME_i", &get_ident, native_ident, &ident);
CHECK_ENV("UNAME_K", &get_kernvers, native_kernvers, &kernvers);
CHECK_ENV("UNAME_U", &get_uservers, native_uservers, &uservers);
CHECK_ENV("UNAME_G", &get_pkgabi, native_pkgabi, &pkgabi);
CHECK_ENV("UNAME_b", &get_buildid, native_buildid, &buildid);