NAME

       tcsendbreak - send a break for a specific duration

SYNOPSIS

       #include <termios.h>

       int tcsendbreak(int fildes, int duration);

DESCRIPTION

       If the terminal is using asynchronous serial data transmission, tcsendbreak() shall cause transmission of
       a  continuous  stream  of  zero-valued  bits  for  a  specific duration. If duration is 0, it shall 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 shall send zero-valued bits for an implementation-defined period of time.

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

       If the terminal is not using asynchronous serial data transmission, it is implementation-defined  whether
       tcsendbreak() 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 shall cause the process group to be sent a  SIGTTOU  signal.  If
       the  calling process is blocking or ignoring SIGTTOU signals, the process shall be allowed to perform the
       operation, and no signal is sent.

RETURN VALUE

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

ERRORS

       The tcsendbreak() function shall 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.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       The Base Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface, <termios.h>,
       <unistd.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open  Group  Base
       Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers,
       Inc  and  The  Open Group. In the event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard  is  the  referee  document.  The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                                   2003                                        TCSENDBREAK(P)