code: def get_shared_memory_bytes():
      
      # Make sure this is only called on Linux.
      assert sys.platform == "linux" or sys.platform == "linux2"
  
      shm_fd = os.open("/dev/shm", os.O_RDONLY)
      try:
          shm_fs_stats = os.fstatvfs(shm_fd)
          # The value shm_fs_stats.f_bsize is the block size and the
          # value shm_fs_stats.f_bavail is the number of available
          # blocks.
          shm_avail = shm_fs_stats.f_bsize * shm_fs_stats.f_bavail
      finally:
          os.close(shm_fd)
  
      return shm_avail
docs: Get the size of the shared memory file system.
  
      Returns:
          The size of the shared memory file system in bytes.