from mmap import mmap, MAP_SHARED, PROT_READ, PROT_WRITE
import os

# dummy syscall to print "close(12345)" in strace
def strace_printf():
    try:
        os.close(12345)
    except OSError:
        pass

size = 4096
shared_memory = mmap(-1, size, MAP_SHARED, PROT_READ|PROT_WRITE)
strace_printf()
shared_memory.close()
strace_printf()