Standard C Library Functions                      tcsendbreak(3C)

NAME
     tcsendbreak - send a ``break'' for a specific duration

SYNOPSIS
     #include <termios.h>

     int tcsendbreak(int fildes, int duration);

DESCRIPTION
     The fildes argument is an open  file  descriptor  associated
     with a terminal.

     If the terminal is using asynchronous serial data  transmis-
     sion,  tcsendbreak() will cause transmission of a continuous
     stream of zero-valued bits  for  a  specific  duration.   If
     duration  is  0,  it  will 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 behaves in a way similar
     to tcdrain(3C).

     If the  terminal  is  not  using  asynchronous  serial  data
     transmission, it 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 will cause the  process  group
     to  be  sent  a  SIGTTOU  signal.  If the calling process is
     blocking or ignoring SIGTTOU signals, the process is allowed
     to perform the operation, and no signal is sent.

RETURN VALUES
     Upon successful completion, 0 is returned. Otherwise, -1  is
     returned and errno is set to indicate the error.

ERRORS
     The tcsendbreak() function will 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.

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

SunOS 5.8           Last change: 29 Dec 1996                    1

Standard C Library Functions                      tcsendbreak(3C)

     ______________________________________________________________
    |       ATTRIBUTE TYPE        |        ATTRIBUTE VALUE        |
    |_____________________________|_______________________________|
    | MT-Level                    | MT-Safe, and Async-Signal-Safe|
    |_____________________________|_______________________________|

SEE ALSO
     tcdrain(3C), attributes(5), termio(7I)

SunOS 5.8           Last change: 29 Dec 1996                    2