/*
* It is a frontend to tty_select(), that also checks our program buffer
*/
int tty_xselect(bool *rd, bool *wr, int timeout)
{
if( rd && rx_pos > 0 )
{
(void)tty_select(NULL, wr, 0); *rd = TRUE;
return TTY_SUCCESS;
}
return tty_select(rd, wr, timeout);
}
static status_t
master_select(void *_cookie, uint8 event, uint32 ref, selectsync *sync)
{
master_cookie *cookie = (master_cookie *)_cookie;
return tty_select(cookie, event, ref, sync);
}
/*
* On success return number of bytes received
*/
int tty_read_timeout(unsigned char *buf, size_t size, int timeout)
{
int rc;
bool rd = FALSE;
tty_status = TTY_SUCCESS;
DEB((D_TTYIO, "tty_read_timeout: want read %d byte(s), timeout = %d", size, timeout));
if( timeout > 0 )
{
if( (rc = tty_select(&rd, NULL, timeout)) < 0 )
return rc;
if( rd )
{
if( (rc = tty_read(buf, size)) == 0 )
return TTY_ERROR;
return rc;
}
return TTY_TIMEOUT;
}
return tty_read(buf, size);
}
/*
* Return non-zero value if some data available for reading
* in input queue OR in our RX buffer
*/
int tty_charwait(int timeout)
{
bool rd = FALSE;
if( rx_pos > 0 )
return 1;
else if( tty_select(&rd, NULL, timeout) == 0 && rd == TRUE )
return 1;
else
return 0;
}
