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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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TCSENDBREAK(3P) POSIX Programmer's Manual TCSENDBREAK(3P)
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.
tcsendbreak — send a break for a specific duration
#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 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.
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.
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.
None.
None.
None.
None.
The Base Definitions volume of POSIX.1‐2017, Chapter 11, General
Terminal Interface, termios.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
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
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 TCSENDBREAK(3P)
Pages that refer to this page: termios.h(0p), tcflow(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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