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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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TCFLOW(3P) POSIX Programmer's Manual TCFLOW(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.
tcflow — suspend or restart the transmission or reception of data
#include <termios.h>
int tcflow(int fildes, int action);
The tcflow() function shall suspend or restart transmission or
reception of data on the object referred to by fildes, depending
on the value of action. The fildes argument is an open file
descriptor associated with a terminal.
* If action is TCOOFF, output shall be suspended.
* If action is TCOON, suspended output shall be restarted.
* If action is TCIOFF and fildes refers to a terminal device,
the system shall transmit a STOP character, which is intended
to cause the terminal device to stop transmitting data to the
system. If fildes is associated with a pseudo-terminal, the
STOP character need not be transmitted.
* If action is TCION and fildes refers to a terminal device, the
system shall transmit a START character, which is intended to
cause the terminal device to start transmitting data to the
system. If fildes is associated with a pseudo-terminal, the
START character need not be transmitted.
The default on the opening of a terminal file is that neither its
input nor its output are suspended.
Attempts to use tcflow() 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 tcflow() function shall fail if:
EBADF The fildes argument is not a valid file descriptor.
EINVAL The action argument is not a supported value.
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.
tcsendbreak(3p)
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 TCFLOW(3P)
Pages that refer to this page: termios.h(0p)
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HTML rendering created 2025-09-06 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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