tcsendbreak - interrupt serial data transmission

Syntax	#include <termios.h> int tcsendbreak(int fildes, int duration);
Description	Extension In non-conformance with XPG4, this function has no effect and returns without performing any action. (End)
Return val.	0 -1	if successful. if an error occurs. errno is set to indicate the error.
Errors	tcsendbreak() will fail if:
	EBADF	fildes is not a valid file descriptor.
	Extension
	EINVAL	An attempt was made to access a BS2000 file. (End)
	EIO	The process group of the writing process is orphaned, and the writing process is not ignoring or blocking SIGTTOU.
	ENOTTY	The file associated with fildes is not a terminal.
See also	termios.h, unistd.h, section “General terminal interface”.