mergerfs/tests/TEST_o_direct

#!/usr/bin/env python3

import os
import sys
import tempfile
import mmap
import resource

(fd,filepath) = tempfile.mkstemp(dir=sys.argv[1])

os.close(fd)

fd = os.open(filepath,os.O_RDWR|os.O_DIRECT|os.O_TRUNC)

os.unlink(filepath)

data = mmap.mmap(-1, resource.getpagesize())

os.write(fd,data)

os.lseek(fd,0,os.SEEK_SET)

data = os.read(fd,resource.getpagesize())

os.close(fd)