Algorithmus zum Schließen eines Gerätes

algorithm close    /* for devices */
input:  file descriptor
output: none
{
   do regular close algorithm;
   if (file table reference count not 0)
      goto finish;
   if (there is another open file and its major, minor numbers are 
       same as device being closed)
      goto finish;    /* not last close after all */
   if (character device)
   {
      use major number to index into character device switch table;
      call driver close routine: parameter minor number;
   }
   if (block device)
   {
      if (device mounted)
         goto finish;
      write device blocks in buffer cache to device;
      use major number to index into block device switch table;
      call driver close routine: parameter minor number;
      invalidate device blocks still in buffer cache;
   }
   finish: release inode;
}