static void handle_control (int fd)
{
for (;;)
{
char c ;
int r = sanitize_read(fd_read(fd, &c, 1)) ;
if (r == -1) panic("read control pipe") ;
else if (!r) break ;
else switch (c)
{
case 'p' : finish_arg = "poweroff" ; break ;
case 'h' : hup() ; return ;
case 'r' : finish_arg = "reboot" ; break ;
case 'a' : wantscan = 1 ; break ;
case 't' : term() ; return ;
case 's' : finish_arg = "halt" ; break ;
case 'z' : wantreap = 1 ; break ;
case 'b' : cont = 0 ; return ;
case 'n' : wantkill = 2 ; break ;
case 'N' : wantkill = 6 ; break ;
case '6' :
case 'i' : intr() ; return ;
case 'q' : quit() ; return ;
case '0' : finish_arg = "halt" ; term() ; return ;
case '7' : usr1() ; return ;
case '8' : finish_arg = "other" ; term() ; return ;
default :
{
char s[2] = { c, 0 } ;
strerr_warnw2x("received unknown control command: ", s) ;
}
}
}
}
static void handle_signals (void)
{
for (;;)
{
switch (selfpipe_read())
{
case -1 : panic("selfpipe_read") ;
case 0 : return ;
case SIGCHLD : wantreap = 1 ; break ;
case SIGALRM : wantscan = 1 ; break ;
case SIGTERM : term() ; break ;
case SIGHUP : hup() ; break ;
case SIGQUIT : quit() ; break ;
case SIGABRT : cont = 0 ; break ;
case SIGINT : intr() ; break ;
case SIGUSR1 : usr1() ; break ;
}
}
}
short UARTSerial::poll(short events) const {
short revents = 0;
/* Check the Circular Buffer if space available for writing out */
if (!_rxbuf.empty()) {
revents |= POLLIN;
}
/* POLLHUP and POLLOUT are mutually exclusive */
if (hup()) {
revents |= POLLHUP;
} else if (!_txbuf.full()) {
revents |= POLLOUT;
}
/*TODO Handle other event types */
return revents;
}
// Also called from write to start transfer
void UARTSerial::tx_irq(void)
{
bool was_full = _txbuf.full();
/* Write to the peripheral if there is something to write
* and if the peripheral is available to write. */
while (!_txbuf.empty() && SerialBase::writeable()) {
char data;
_txbuf.pop(data);
SerialBase::_base_putc(data);
}
if (_tx_irq_enabled && _txbuf.empty()) {
SerialBase::attach(NULL, TxIrq);
_tx_irq_enabled = false;
}
/* Report the File handler that data can be written to peripheral. */
if (was_full && !_txbuf.full() && !hup()) {
wake();
}
}