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

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  dura-
       tion  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 sig-
       nals, 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  Inter-
       face, <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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				   TCSENDBREAK(P)
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