отправить перерыв на определенную продолжительность (send a break for a specific duration)
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)
tcsendbreak — send a break for a specific duration
Синопсис (Synopsis)
#include <termios.h>
int tcsendbreak(int fildes, int duration);
Описание (Description)
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.
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 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.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
The Base Definitions volume of POSIX.1‐2017, Chapter 11, General
Terminal Interface, termios.h(0p)
