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NetBSD 6.1.5 - man page for tcsendbreak (netbsd section 3)

TCSENDBREAK(3)			   BSD Library Functions Manual 		   TCSENDBREAK(3)

NAME
     tcsendbreak, tcdrain, tcflush, tcflow -- line control functions

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <termios.h>

     int
     tcdrain(int fd);

     int
     tcflow(int fd, int action);

     int
     tcflush(int fd, int action);

     int
     tcsendbreak(int fd, int len);

DESCRIPTION
     The tcdrain function waits until all output written to the terminal referenced by fd has
     been transmitted to the terminal.

     The tcflow function suspends transmission of data to or the reception of data from the ter-
     minal referenced by fd 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 terminal to stop transmit-
	     ting data to the system.  (See the description of IXOFF in the 'Input Modes' section
	     of termios(4)).

     TCION   Transmit a START character, which is intended to cause the terminal to start trans-
	     mitting data to the system.  (See the description of IXOFF in the 'Input Modes' sec-
	     tion of termios(4)).

     The tcflush function discards any data written to the terminal referenced by fd 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 fd.  The len parameter is ignored in this imple-
     mentation.

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 indi-
     cate the error, as follows:

     [EBADF]		The fd argument is not a valid file descriptor.

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

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

     [EINTR]		A signal interrupted the tcdrain function.

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


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