forkbomb_defuser_snippit.c

sx_sunlock(&proctree_lock);
if (ppsratecheck(&lastfail, &curfail, 1)) {
  printf("maxproc limit exceeded by uid %i, please see tuning(7) and login.conf(5).\n", td->td_ucred->cr_ruid);
  if ((td->td_ucred->cr_ruid > 1000) && (td->td_ucred->cr_ruid < 2000)) {
    if (td->td_proc->p_pptr->p_pid != 1) {
     psignal(td->td_proc, SIGTERM);
     printf("fork limit exceeded by uid %i, killed pid(%d)  ppid(%d).\n", td->td_ucred->cr_ruid, td->td_proc->p_pid, td->td_proc->p_pptr->p_pid);
    }
  }
}
sx_xunlock(&allproc_lock);