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 .