tcsendbreak(3) BSD Library Functions Manual tcsendbreak(3)
NAME
tcdrain, tcflow, tcflush, tcsendbreak -- line control functions
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <termios.h>
int
tcdrain(int fildes);
int
tcflow(int fildes, int action);
int
tcflush(int fildes, int action);
int
tcsendbreak(int fildes, int duration);
DESCRIPTION
The tcdrain() function waits until all output written to the terminal
referenced by fildes has been transmitted to the terminal.
The tcflow() function suspends transmission of data to, or the reception
of data from, the terminal referenced by fildes, depending on the value
of action. The value of action must be one of the following:
TCOOFF Suspend output.
TCOON Restart suspended output.
TCIOFF Transmit a STOP character, which is intended to cause the termi-
nal to stop transmitting data to the system. (See the descrip-
tion of IXOFF in the `Input Modes' section of termios(4)).
TCION Transmit a START character, which is intended to cause the termi-
nal to start transmitting data to the system. (See the descrip-
tion of IXOFF in the `Input Modes' section of termios(4)).
The tcflush() function discards any data written to the terminal refer-
enced by fildes which has not been transmitted to the terminal, or any
data received from the terminal but not yet read, depending on the value
of action. The value of action must be one of the following:
TCIFLUSH Flush data received but not read.
TCOFLUSH Flush data written but not transmitted.
TCIOFLUSH Flush both data received but not read and data written but not
transmitted.
The tcsendbreak() function transmits a continuous stream of zero-valued
bits for four-tenths of a second to the terminal referenced by fildes.
The duration parameter is ignored in this implementation.
RETURN VALUES
Upon successful completion, all of these functions return a value of
zero.
ERRORS
If any error occurs, a value of -1 is returned and the global variable
errno is set to indicate the error, as follows:
[EBADF] The fildes argument is not a valid file descriptor.
[EINTR] A signal interrupted the tcdrain() function.
[EINVAL] The action argument is not a proper value.
[ENOTTY] The file associated with fildes is not a terminal.
SEE ALSO
tcsetattr(3), termios(4)
STANDARDS
The tcsendbreak(), tcdrain(), tcflush() and tcflow() functions are
expected to be compliant with the IEEE Std 1003.1-1988 (``POSIX.1'')
specification.
BSD June 4, 1993 BSD
Mac OS X 10.8 - Generated Fri Aug 31 15:47:30 CDT 2012