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

PROLOG         top

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

NAME         top

       tcsendbreak — send a break for a specific duration

SYNOPSIS         top

       #include <termios.h>

       int tcsendbreak(int fildes, int duration);

DESCRIPTION         top

       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

       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 thread is blocking SIGTTOU signals or the process is
       ignoring SIGTTOU signals, the process shall be allowed to perform the
       operation, and no signal is sent.

RETURN VALUE         top

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

ERRORS         top

       The tcsendbreak() function shall fail if:

       EBADF  The fildes argument is not a valid file descriptor.

       EIO    The process group of the writing process is orphaned, the
              calling thread is not blocking SIGTTOU, and the process is not
              ignoring SIGTTOU.

       ENOTTY The file associated with fildes is not a terminal.

       The following sections are informative.

EXAMPLES         top




RATIONALE         top




SEE ALSO         top

       The Base Definitions volume of POSIX.1‐2008, Chapter 11, General
       Terminal Interface, termios.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) 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 .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see .

IEEE/The Open Group                 2013                     TCSENDBREAK(3P)

Pages that refer to this page: termios.h(0p)tcflow(3p)