tcsendbreak(3C) 					   Standard C Library Functions 					   tcsendbreak(3C)

NAME

       tcsendbreak - send a ``break'' for a specific duration

SYNOPSIS

       #include <termios.h>

       int tcsendbreak(int fildes, int duration);

DESCRIPTION

       The fildes argument is an open file descriptor associated with a terminal.

       If the terminal is using asynchronous serial data transmission, tcsendbreak() will cause transmission of a continuous stream of zero-valued
       bits for a specific duration.  If duration is 0, it will cause transmission of zero-valued bits for at least 0.25  seconds,  and  not  more
       than 0.5 seconds.  If duration is not 0, it behaves in a way similar to tcdrain(3C).

       If  the	terminal is not using asynchronous serial data transmission, it sends data to generate a break condition or returns without taking
       any action.

       Attempts to use tcsendbreak() from a process which is a member of a background process group on a fildes associated  with  its  controlling
       terminal  will  cause  the  process  group to be sent a SIGTTOU signal. If the calling process is blocking or ignoring SIGTTOU signals, the
       process is allowed to perform the operation, and no signal is sent.

RETURN VALUES

       Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The tcsendbreak() function will fail if:

       EBADF	 The fildes argument is not a valid file descriptor.

       ENOTTY	 The file associated with fildes is not a terminal.

       The tcsendbreak() function may fail if:

       EIO    The process group of the writing process is orphaned, and the writing process is not ignoring or blocking SIGTTOU.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-------------------------------+
       |      ATTRIBUTE TYPE	     |	     ATTRIBUTE VALUE	     |
       +-----------------------------+-------------------------------+
       |Interface Stability	     |Standard			     |
       +-----------------------------+-------------------------------+
       |MT-Level		     |MT-Safe, and Async-Signal-Safe |
       +-----------------------------+-------------------------------+

SEE ALSO

       tcdrain(3C), attributes(5), standards(5), termio(7I)

SunOS 5.11							    14 Aug 2002 						   tcsendbreak(3C)