tccontrol(3C)															     tccontrol(3C)

NAME

       tcsendbreak(), tcdrain(), tcflush(), tcflow() - tty line control functions

SYNOPSIS

DESCRIPTION

       If  the	terminal is using asynchronous serial data transmission, causes transmission of a continuous stream of zero-valued bits for a spe-
       cific duration.	If duration is zero, it causes transmission of zero-valued bits for at least 0.25 seconds, but not more than 0.5  seconds.
       If duration is not zero, zero-valued bits are not transmitted.

       waits until all output written to fildes has been transmitted.

       discards data written to fildes but not transmitted, or data received but not read, depending on the value of queue_selector:

	      o  If queue_selector is data received but not read is flushed.

	      o  If queue_selector is data written but not transmitted is flushed.

	      o  If queue_selector is both data received but not read, and data written but not transmitted is flushed.

       suspends transmission of data to fildes or reception of data from fildes, depending on the value of action:

	      o  If action is output is suspended.

	      o  If action is suspended output is restarted.

	      o  If action is a STOP character is transmitted which is intended to cause the terminal to stop transmitting data to the system.

	      o  If action is a START character is transmitted which is intended to cause the terminal to start transmitting data to the system.

RETURN VALUE

       Upon successful completion, a value of zero is returned.  Otherwise, a value of -1 is returned and is set to indicate the error.

ERRORS

       These functions fail if one or more of the following is true:

	      [EBADF]	     fildes is not a valid file descriptor.

	      [EINTR]	     A signal was received during

	      [EINVAL]	     The queue_selector or the action argument is not a proper value.

	      [ENOTTY]	     The file associated with fildes is not a terminal.

SEE ALSO

       tcattribute(3C), tccontrol(3C), thread_safety(5), termio(7).

STANDARDS CONFORMANCE

																     tccontrol(3C)