ps = sysconf (_SC_PAGESIZE) - 2 * sizeof (void);
ps = sysconf (_SC_PAGESIZE) - 2 * sizeof (void *);
strtabinit (void){  if (ps == 0)    {      ps = sysconf (_SC_PAGESIZE) - 2 * sizeof (void);      assert (sizeof (struct memoryblock) < ps);    }  return (struct Strtab *) calloc (1, sizeof (struct Strtab));}