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 (consult the correspond-
       ing 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-val-
       ued 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 gener-
       ate 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 Technol-
       ogy -- 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(3P)