sendfile_
EXPECT_NOTCAPABLE(sendfile_(cap_out_ro, cap_in_ro, &offset, 4));
EXPECT_NOTCAPABLE(sendfile_(cap_out_wo, cap_in_wo, &offset, 4));
EXPECT_OK(sendfile_(cap_out_wo, cap_in_ro, &offset, 4));
EXPECT_FAIL_NOT_CAPMODE(sendfile_(fd_socket_, fd_file_, &offset, 1));