Originální popis anglicky:
tcsendbreak - send a break for a specific duration
Návod, kniha: POSIX Programmer's Manual
#include <termios.h>
int tcsendbreak(int
fildes, int
duration );
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.
Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned
and
errno set to indicate the error.
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.
None.
None.
None.
None.
The Base Definitions volume of IEEE Std 1003.1-2001, Chapter 11,
General Terminal Interface,
<termios.h>,
<unistd.h>
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
.
