Home Contents | # rawio:drain | Rawio | Core4 Lua Event System

## SYNOPSIS

handle:drain()

## DESCRIPTION

Waits until all data buffered in the transmit buffer has been sent.

## RETURN VALUE

On success, returns true. On failure, returns nil. In case of an error, the error can be retrieved using rawio:lastError().

## ERRORS

This function works only on TTY devices.

## NOTES

This function might wait indefinitely if some sort of handshaking (RTS/CTS or Xon/Xoff) is configured.

## SEE ALSO

rawio:break, rawio:cts, rawio:dcd, rawio:device, rawio:dsr, rawio:dtr, rawio:fd, rawio:flush, rawio:name, rawio:rng, rawio:rts, rawio:rxcnt, rawio:setDtr, rawio:setRts, rawio:setupComm, rawio:start, rawio:stop, rawio:txcnt