static cyg_bool
serial_select(cyg_io_handle_t handle, cyg_uint32 which, CYG_ADDRWORD info)
{
#ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle;
serial_channel *chan = (serial_channel *)t->priv;
switch( which )
{
case CYG_FREAD:
{
cbuf_t *cbuf = &chan->in_cbuf;
// Check for data in the input buffer. If there is none,
// register the select operation, otherwise return true.
if( cbuf->nb == 0 )
cyg_selrecord( info, &cbuf->selinfo );
else return true;
}
break;
case CYG_FWRITE:
{
// Check for space in the output buffer. If there is none,
// register the select operation, otherwise return true.
cbuf_t *cbuf = &chan->out_cbuf;
int space = cbuf->len - cbuf->nb;
#ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
if ( (space < cbuf->low_water) ||
(chan->flow_desc.flags & CYG_SERIAL_FLOW_OUT_THROTTLED) )
cyg_selrecord( info, &cbuf->selinfo );
#else
if (space < cbuf->low_water)
cyg_selrecord( info, &cbuf->selinfo );
#endif
else return true;
}
break;
case 0: // exceptions - none supported
break;
}
return false;
#else
// With no select support, we simply return true.
return true;
#endif
}
static int
bsd_select(struct CYG_FILE_TAG *fp, int which, CYG_ADDRWORD info)
{
register struct socket *so = (struct socket *)fp->f_data;
register int s = splsoftnet();
switch (which) {
case FREAD:
if (soreadable(so)) {
splx(s);
return (1);
}
cyg_selrecord(info, &so->so_rcv.sb_sel);
so->so_rcv.sb_flags |= SB_SEL;
break;
case FWRITE:
if (sowriteable(so)) {
splx(s);
return (1);
}
cyg_selrecord(info, &so->so_snd.sb_sel);
so->so_snd.sb_flags |= SB_SEL;
break;
case 0:
if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) {
splx(s);
return (1);
}
cyg_selrecord(info, &so->so_rcv.sb_sel);
so->so_rcv.sb_flags |= SB_SEL;
break;
}
splx(s);
return ENOERR;
}
static cyg_bool
ts_select(cyg_io_handle_t handle,
cyg_uint32 which,
cyg_addrword_t info)
{
if (which == CYG_FREAD) {
cyg_scheduler_lock(); // Prevent interaction with DSR code
if (num_events > 0) {
cyg_scheduler_unlock(); // Reallow interaction with DSR code
return true;
}
if (!ts_select_active) {
ts_select_active = true;
cyg_selrecord(info, &ts_select_info);
}
cyg_scheduler_unlock(); // Reallow interaction with DSR code
}
return false;
}
static cyg_bool _panel_select(cyg_io_handle_t handle, cyg_uint32 which, CYG_ADDRWORD info)
{
cyg_bool retval = false;
switch(which)
{
case CYG_FREAD:
if(s_panel_key == 0)
cyg_selrecord( info, &sg_PanelSignal);
else retval = true;
break;
case CYG_FWRITE: //write - not support
break;
case 0: //exceptions - not support
break;
default:
break;
}
return retval;
}
