TCSENDBREAK(3P)                                     POSIX Programmer's Manual                                    TCSENDBREAK(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

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 imple-
       mentation-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,  Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                               TCSENDBREAK(3P)