Originální popis anglicky:
tcflow - suspend or restart the transmission or reception of data
Návod, kniha: POSIX Programmer's Manual
#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, the system shall transmit a
STOP character, which is intended to cause the terminal device to stop
transmitting data to the system.
- *
- If action is TCION, the system shall transmit a
START character, which is intended to cause the terminal device to start
transmitting data to the system.
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
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
tcflow() function shall fail if:
- EBADF
- The fildes argument is not a valid file
descriptor.
- EINVAL
- The action argument is not a supported value.
- ENOTTY
- The file associated with fildes is not a terminal.
The
tcflow() 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.
tcsendbreak() , 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
.
