1TCSENDBREAK(3P)            POSIX Programmer's Manual           TCSENDBREAK(3P)
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PROLOG

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

12       tcsendbreak - send a break for a specific duration
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SYNOPSIS

15       #include <termios.h>
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17       int tcsendbreak(int fildes, int duration);
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DESCRIPTION

21       If the terminal is using asynchronous serial data transmission, tcsend‐
22       break()  shall cause transmission of a continuous stream of zero-valued
23       bits for a specific duration. If duration is 0, it shall  cause  trans‐
24       mission  of  zero-valued  bits  for at least 0.25 seconds, and not more
25       than 0.5 seconds. If duration is not 0, it shall send zero-valued  bits
26       for an implementation-defined period of time.
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28       The fildes argument is an open file descriptor associated with a termi‐
29       nal.
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31       If the terminal is not using asynchronous serial data transmission,  it
32       is  implementation-defined whether tcsendbreak() sends data to generate
33       a break condition or returns without taking any action.
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35       Attempts to use tcsendbreak() from a process which is  a  member  of  a
36       background  process  group  on a fildes associated with its controlling
37       terminal shall cause the process group to be sent a SIGTTOU signal.  If
38       the  calling  process  is  blocking  or  ignoring  SIGTTOU signals, the
39       process shall be allowed to perform the operation,  and  no  signal  is
40       sent.
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RETURN VALUE

43       Upon successful completion, 0 shall be returned. Otherwise, -1 shall be
44       returned and errno set to indicate the error.
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ERRORS

47       The tcsendbreak() function shall fail if:
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49       EBADF  The fildes argument is not a valid file descriptor.
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51       ENOTTY The file associated with fildes is not a terminal.
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54       The tcsendbreak() function may fail if:
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56       EIO    The process group of the writing process is  orphaned,  and  the
57              writing process is not ignoring or blocking SIGTTOU.
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60       The following sections are informative.
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EXAMPLES

63       None.
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APPLICATION USAGE

66       None.
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RATIONALE

69       None.
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FUTURE DIRECTIONS

72       None.
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SEE ALSO

75       The  Base  Definitions volume of IEEE Std 1003.1-2001, Chapter 11, Gen‐
76       eral Terminal Interface, <termios.h>, <unistd.h>
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79       Portions of this text are reprinted and reproduced in  electronic  form
80       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
81       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
82       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
83       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
84       event of any discrepancy between this version and the original IEEE and
85       The Open Group Standard, the original IEEE and The Open Group  Standard
86       is  the  referee document. The original Standard can be obtained online
87       at http://www.opengroup.org/unix/online.html .
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91IEEE/The Open Group                  2003                      TCSENDBREAK(3P)
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