mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
156 lines
4.5 KiB
Groff
156 lines
4.5 KiB
Groff
.\" Copyright (c) 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)tcsendbreak.3 8.1 (Berkeley) 6/4/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 4, 1993
|
|
.Dt TCSENDBREAK 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm tcsendbreak ,
|
|
.Nm tcdrain ,
|
|
.Nm tcflush ,
|
|
.Nm tcflow
|
|
.Nd line control functions
|
|
.Sh SYNOPSIS
|
|
.Fd #include <termios.h>
|
|
.Ft int
|
|
.Fn tcdrain "int fd"
|
|
.Ft int
|
|
.Fn tcflow "int fd" "int action"
|
|
.Ft int
|
|
.Fn tcflush "int fd" "int action"
|
|
.Ft int
|
|
.Fn tcsendbreak "int fd" "int len"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn tcdrain
|
|
function waits until all output written to the terminal referenced by
|
|
.Fa fd
|
|
has been transmitted to the terminal.
|
|
.Pp
|
|
The
|
|
.Fn tcflow
|
|
function suspends transmission of data to or the reception of data from
|
|
the terminal referenced by
|
|
.Fa fd
|
|
depending on the value of
|
|
.Fa action .
|
|
The value of
|
|
.Fa action
|
|
must be one of the following:
|
|
.Bl -tag -width "TCIOFF"
|
|
.It Fa TCOOFF
|
|
Suspend output.
|
|
.It Fa TCOON
|
|
Restart suspended output.
|
|
.It Fa TCIOFF
|
|
Transmit a STOP character, which is intended to cause the terminal to stop
|
|
transmitting data to the system.
|
|
(See the description of IXOFF in the
|
|
.Ql Input Modes
|
|
section of
|
|
.Xr termios 4 ).
|
|
.It Fa TCION
|
|
Transmit a START character, which is intended to cause the terminal to start
|
|
transmitting data to the system.
|
|
(See the description of IXOFF in the
|
|
.Ql Input Modes
|
|
section of
|
|
.Xr termios 4 ).
|
|
.El
|
|
.Pp
|
|
The
|
|
.Fn tcflush
|
|
function discards any data written to the terminal referenced by
|
|
.Fa fd
|
|
which has not been transmitted to the terminal, or any data received
|
|
from the terminal but not yet read, depending on the value of
|
|
.Fa action .
|
|
The value of
|
|
.Fa action
|
|
must be one of the following:
|
|
.Bl -tag -width "TCIOFLUSH"
|
|
.It Fa TCIFLUSH
|
|
Flush data received but not read.
|
|
.It Fa TCOFLUSH
|
|
Flush data written but not transmitted.
|
|
.It Fa TCIOFLUSH
|
|
Flush both data received but not read and data written but not transmitted.
|
|
.El
|
|
.Pp
|
|
The
|
|
.Fn tcsendbreak
|
|
function transmits a continuous stream of zero-valued bits for four-tenths
|
|
of a second to the terminal referenced by
|
|
.Fa fd .
|
|
The
|
|
.Fa len
|
|
parameter is ignored in this implementation.
|
|
.Sh RETURN VALUES
|
|
Upon successful completion, all of these functions return a value of zero.
|
|
.Sh ERRORS
|
|
If any error occurs, a value of -1 is returned and the global variable
|
|
.Va errno
|
|
is set to indicate the error, as follows:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EBADF
|
|
The
|
|
.Fa fd
|
|
argument is not a valid file descriptor.
|
|
.It Bq Er EINVAL
|
|
The
|
|
.Fa action
|
|
argument is not a proper value.
|
|
.It Bq Er ENOTTY
|
|
The file associated with
|
|
.Fa fd
|
|
is not a terminal.
|
|
.It Bq Er EINTR
|
|
A signal interrupted the
|
|
.Fn tcdrain
|
|
function.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr tcsetattr 3 ,
|
|
.Xr termios 4
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn tcsendbreak ,
|
|
.Fn tcdrain ,
|
|
.Fn tcflush
|
|
and
|
|
.Fn tcflow
|
|
functions are expected to be compliant with the
|
|
.St -p1003.1-88
|
|
specification.
|