FIFO
0000h - 03FFh FIFO RAM Audio Sample RAM Memory Block - FIFOs
ATF_REQUIRE((fd = open(FIFO, O_CREAT|O_RDWR, 0644)) != -1);
ATF_REQUIRE(mkfifoat(-1, FIFO, mode) == -1);
ATF_REQUIRE(access(FIFO, F_OK) == 0);
ATF_REQUIRE(stat(FIFO, &st) == 0);
ATF_REQUIRE(access(FIFO, F_OK) == 0);
ATF_REQUIRE(mkfifoat(AT_FDCWD, FIFO, mode) != -1);
ATF_REQUIRE(access(FIFO, F_OK) == 0);