This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
331 lines
8.7 KiB
Groff
331 lines
8.7 KiB
Groff
.\" $NetBSD: tcsetattr.3,v 1.13 2010/03/22 19:30:55 joerg Exp $
|
|
.\"
|
|
.\" 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. 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.
|
|
.\"
|
|
.\" @(#)tcsetattr.3 8.3 (Berkeley) 1/2/94
|
|
.\"
|
|
.Dd May 1, 2004
|
|
.Dt TCSETATTR 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm cfgetispeed ,
|
|
.Nm cfsetispeed ,
|
|
.Nm cfgetospeed ,
|
|
.Nm cfsetospeed ,
|
|
.Nm cfsetspeed ,
|
|
.Nm cfmakeraw ,
|
|
.Nm tcgetattr ,
|
|
.Nm tcsetattr
|
|
.Nd manipulating the termios structure
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In termios.h
|
|
.Ft speed_t
|
|
.Fn cfgetispeed "const struct termios *t"
|
|
.Ft int
|
|
.Fn cfsetispeed "struct termios *t" "speed_t speed"
|
|
.Ft speed_t
|
|
.Fn cfgetospeed "const struct termios *t"
|
|
.Ft int
|
|
.Fn cfsetospeed "struct termios *t" "speed_t speed"
|
|
.Ft int
|
|
.Fn cfsetspeed "struct termios *t" "speed_t speed"
|
|
.Ft void
|
|
.Fn cfmakeraw "struct termios *t"
|
|
.Ft int
|
|
.Fn tcgetattr "int fd" "struct termios *t"
|
|
.Ft int
|
|
.Fn tcsetattr "int fd" "int action" "const struct termios *t"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm cfmakeraw ,
|
|
.Nm tcgetattr
|
|
and
|
|
.Nm tcsetattr
|
|
functions are provided for getting and setting the termios structure.
|
|
.Pp
|
|
The
|
|
.Nm cfgetispeed ,
|
|
.Nm cfsetispeed ,
|
|
.Nm cfgetospeed ,
|
|
.Nm cfsetospeed
|
|
and
|
|
.Nm cfsetspeed
|
|
functions are provided for getting and setting the baud rate values in
|
|
the termios structure.
|
|
The effects of the functions on the terminal as described below
|
|
do not become effective, nor are all errors detected, until the
|
|
.Nm tcsetattr
|
|
function is called.
|
|
Certain values for baud rates set in the termios structure and passed to
|
|
.Nm tcsetattr
|
|
have special meanings.
|
|
These are discussed in the portion of the manual page that describes the
|
|
.Nm tcsetattr
|
|
function.
|
|
.Sh GETTING AND SETTING THE BAUD RATE
|
|
The input and output baud rates are found in the termios structure.
|
|
The unsigned integer
|
|
.Li speed_t
|
|
is typdef'd in the include file
|
|
.In termios.h .
|
|
The value of the integer corresponds directly to the baud rate being
|
|
represented, however, the following symbolic values are defined.
|
|
.Bd -literal
|
|
#define B0 0
|
|
#define B50 50
|
|
#define B75 75
|
|
#define B110 110
|
|
#define B134 134
|
|
#define B150 150
|
|
#define B200 200
|
|
#define B300 300
|
|
#define B600 600
|
|
#define B1200 1200
|
|
#define B1800 1800
|
|
#define B2400 2400
|
|
#define B4800 4800
|
|
#define B9600 9600
|
|
#define B19200 19200
|
|
#define B38400 38400
|
|
#ifndef _POSIX_SOURCE
|
|
#define EXTA 19200
|
|
#define EXTB 38400
|
|
#endif /*_POSIX_SOURCE */
|
|
.Ed
|
|
.Pp
|
|
The
|
|
.Nm cfgetispeed
|
|
function returns the input baud rate in the termios structure referenced by
|
|
.Fa tp .
|
|
.Pp
|
|
The
|
|
.Nm cfsetispeed
|
|
function sets the input baud rate in the termios structure referenced by
|
|
.Fa tp
|
|
to
|
|
.Fa speed .
|
|
.Pp
|
|
The
|
|
.Nm cfgetospeed
|
|
function returns the output baud rate in the termios structure referenced by
|
|
.Fa tp .
|
|
.Pp
|
|
The
|
|
.Nm cfsetospeed
|
|
function sets the output baud rate in the termios structure referenced by
|
|
.Fa tp
|
|
to
|
|
.Fa speed .
|
|
.Pp
|
|
The
|
|
.Nm cfsetspeed
|
|
function sets both the input and output baud rate in the termios structure
|
|
referenced by
|
|
.Fa tp
|
|
to
|
|
.Fa speed .
|
|
.Pp
|
|
Upon successful completion, the functions
|
|
.Nm cfsetispeed ,
|
|
.Nm cfsetospeed ,
|
|
and
|
|
.Nm cfsetspeed
|
|
return a value of 0.
|
|
Otherwise, a value of -1 is returned and the global variable
|
|
.Va errno
|
|
is set to indicate the error.
|
|
.Sh GETTING AND SETTING THE TERMIOS STATE
|
|
This section describes the functions that are used to control the general
|
|
terminal interface.
|
|
Unless otherwise noted for a specific command, these functions are restricted
|
|
from use by background processes.
|
|
Attempts to perform these operations shall cause the process group to be sent
|
|
a SIGTTOU signal.
|
|
If the calling process is blocking or ignoring SIGTTOU signals, the process
|
|
is allowed to perform the operation and the SIGTTOU signal is not sent.
|
|
.Pp
|
|
In all the functions, although
|
|
.Fa fd
|
|
is an open file descriptor, the functions affect the underlying terminal
|
|
file, not just the open file description associated with the particular
|
|
file descriptor.
|
|
.Pp
|
|
The
|
|
.Nm cfmakeraw
|
|
function sets the flags stored in the termios structure (initialized by
|
|
.Nm tcgetattr )
|
|
to a state disabling all input and output processing, giving a
|
|
.Dq raw I/O path .
|
|
It should be noted that there is no function to reverse this effect.
|
|
This is because there are a variety of processing options that could be
|
|
re-enabled and the correct method is for an application to snapshot the
|
|
current terminal state using the function
|
|
.Nm tcgetattr ,
|
|
setting raw mode with
|
|
.Nm cfmakeraw
|
|
and the subsequent
|
|
.Nm tcsetattr ,
|
|
and then using another
|
|
.Nm tcsetattr
|
|
with the saved state to revert to the previous terminal state.
|
|
.Pp
|
|
The
|
|
.Nm tcgetattr
|
|
function copies the parameters associated with the terminal referenced
|
|
by
|
|
.Fa fd
|
|
to the termios structure referenced by
|
|
.Fa tp .
|
|
This function is allowed from a background process, however, the terminal
|
|
attributes may be subsequently changed by a foreground process.
|
|
.Pp
|
|
The
|
|
.Nm tcsetattr
|
|
function sets the parameters associated with the terminal from the
|
|
termios structure referenced by
|
|
.Fa tp .
|
|
The
|
|
.Fa action
|
|
field is created by
|
|
.Em or Ns 'ing
|
|
the following values, as specified in the include file
|
|
.In termios.h .
|
|
.Bl -tag -width "TCSADRAIN"
|
|
.It Fa TCSANOW
|
|
The change occurs immediately.
|
|
.It Fa TCSADRAIN
|
|
The change occurs after all output written to
|
|
.Fa fd
|
|
has been transmitted to the terminal.
|
|
This value of
|
|
.Fa action
|
|
should be used when changing parameters that affect output.
|
|
.It Fa TCSAFLUSH
|
|
The change occurs after all output written to
|
|
.Fa fd
|
|
has been transmitted to the terminal.
|
|
Additionally, any input that has been received but not read is discarded.
|
|
.It Fa TCSASOFT
|
|
If this value is
|
|
.Em or Ns 'ed
|
|
into the
|
|
.Fa action
|
|
value, the values of the
|
|
.Em c_cflag ,
|
|
.Em c_ispeed ,
|
|
and
|
|
.Em c_ospeed
|
|
fields are ignored.
|
|
.El
|
|
.Pp
|
|
The 0 baud rate is used to terminate the connection.
|
|
If 0 is specified as the output speed to the function
|
|
.Nm tcsetattr ,
|
|
modem control will no longer be asserted on the terminal, disconnecting
|
|
the terminal.
|
|
.Pp
|
|
If zero is specified as the input speed to the function
|
|
.Nm tcsetattr ,
|
|
the input baud rate will be set to the same value as that specified by
|
|
the output baud rate.
|
|
.Sh RETURN VALUES
|
|
If
|
|
.Nm tcsetattr
|
|
is unable to make any of the requested changes, it returns -1 and
|
|
sets errno.
|
|
Otherwise, it makes all of the requested changes it can.
|
|
If the specified input and output baud rates differ and are a combination
|
|
that is not supported, neither baud rate is changed.
|
|
.Pp
|
|
Upon successful completion, the functions
|
|
.Nm tcgetattr
|
|
and
|
|
.Nm tcsetattr
|
|
return a value of 0.
|
|
Otherwise, they
|
|
return -1 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 to
|
|
.Nm tcgetattr
|
|
or
|
|
.Nm tcsetattr
|
|
was not a valid file descriptor.
|
|
.It Bq Er EINTR
|
|
The
|
|
.Nm tcsetattr
|
|
function was interrupted by a signal.
|
|
.It Bq Er EINVAL
|
|
The
|
|
.Fa action
|
|
argument to the
|
|
.Nm tcsetattr
|
|
function was not valid, or an attempt was made to change an attribute
|
|
represented in the termios structure to an unsupported value.
|
|
.It Bq Er ENOTTY
|
|
The file associated with the
|
|
.Fa fd
|
|
argument to
|
|
.Nm tcgetattr
|
|
or
|
|
.Nm tcsetattr
|
|
is not a terminal.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr tcsendbreak 3 ,
|
|
.Xr termios 4
|
|
.Sh STANDARDS
|
|
The
|
|
.Nm cfgetispeed ,
|
|
.Nm cfsetispeed ,
|
|
.Nm cfgetospeed ,
|
|
.Nm cfsetospeed ,
|
|
.Nm tcgetattr
|
|
and
|
|
.Nm tcsetattr
|
|
functions are expected to be compliant with the
|
|
.St -p1003.1-88
|
|
specification.
|
|
The
|
|
.Nm cfmakeraw
|
|
and
|
|
.Nm cfsetspeed
|
|
functions,
|
|
as well as the
|
|
.Li TCSASOFT
|
|
option to the
|
|
.Nm tcsetattr
|
|
function are extensions to the
|
|
.St -p1003.1-88
|
|
specification.
|