приостановить или перезапустить передачу или прием данных (suspend or restart the transmission or reception of data)
Пролог (Prolog)
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.
Имя (Name)
tcflow — suspend or restart the transmission or reception of data
Синопсис (Synopsis)
#include <termios.h>
int tcflow(int fildes, int action);
Описание (Description)
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.
Возвращаемое значение (Return value)
Upon successful completion, 0 shall be returned. Otherwise, -1
shall be returned and errno set to indicate the error.
Ошибки (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.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
tcsendbreak(3p)
The Base Definitions volume of POSIX.1‐2017, Chapter 11, General
Terminal Interface, termios.h(0p)
