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-.\" Copyright (c) 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
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-.\" modification, are permitted provided that the following conditions
-.\" are met:
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-.\"    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
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-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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-.\"
-.\"	@(#)tcsetattr.3	8.3 (Berkeley) 1/2/94
-.\" $FreeBSD: src/lib/libc/gen/tcsetattr.3,v 1.9 2001/10/01 16:08:51 ru Exp $
-.\"
-.Dd January 2, 1994
-.Dt TCSETATTR 3
-.Os
-.Sh NAME
-.Nm cfgetispeed ,
-.Nm cfgetospeed ,
-.Nm cfmakeraw ,
-.Nm cfsetispeed ,
-.Nm cfsetospeed ,
-.Nm cfsetspeed ,
-.Nm tcgetattr ,
-.Nm tcsetattr
-.Nd manipulating the termios structure
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In termios.h
-.Ft speed_t
-.Fo cfgetispeed
-.Fa "const struct termios *termios_p"
-.Fc
-.Ft speed_t
-.Fo cfgetospeed
-.Fa "const struct termios *termios_p"
-.Fc
-.Ft void
-.Fo cfmakeraw
-.Fa "struct termios *termios_p"
-.Fc
-.Ft int
-.Fo cfsetispeed
-.Fa "struct termios *termios_p"
-.Fa "speed_t speed"
-.Fc
-.Ft int
-.Fo cfsetospeed
-.Fa "struct termios *termios_p"
-.Fa "speed_t speed"
-.Fc
-.Ft int
-.Fo cfsetspeed
-.Fa "struct termios *termios_p"
-.Fa "speed_t speed"
-.Fc
-.Ft int
-.Fo tcgetattr
-.Fa "int fildes"
-.Fa "struct termios *termios_p"
-.Fc
-.Ft int
-.Fo tcsetattr
-.Fa "int fildes"
-.Fa "int optional_actions"
-.Fa "const struct termios *termios_p"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn cfmakeraw ,
-.Fn tcgetattr ,
-and
-.Fn tcsetattr
-functions are provided for getting and setting the termios structure.
-.Pp
-The
-.Fn cfgetispeed ,
-.Fn cfsetispeed ,
-.Fn cfgetospeed ,
-.Fn cfsetospeed ,
-and
-.Fn cfsetspeed
-functions are provided for getting and setting the baud rate values in
-the termios structure.
-As described below,
-the effects of the functions on the terminal do not become effective,
-nor are all errors detected, until the
-.Fn tcsetattr
-function is called.
-Certain values for baud rates, set in the termios structure and passed to
-.Fn tcsetattr ,
-have special meanings.
-These are discussed in the portion of the manual page that describes the
-.Fn 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 typedef'd in the include file
-.Aq Pa 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_C_SOURCE
-#define EXTA	19200
-#define EXTB	38400
-#endif  /*_POSIX_C_SOURCE */
-.Ed
-.Pp
-The
-.Fn cfgetispeed
-function returns the input baud rate in the termios structure referenced by
-.Fa termios_p .
-.Pp
-The
-.Fn cfsetispeed
-function sets the input baud rate in the termios structure referenced by
-.Fa termios_p
-to
-.Fa speed .
-.Pp
-The
-.Fn cfgetospeed
-function returns the output baud rate in the termios structure referenced by
-.Fa termios_p .
-.Pp
-The
-.Fn cfsetospeed
-function sets the output baud rate in the termios structure referenced by
-.Fa termios_p
-to
-.Fa speed .
-.Pp
-The
-.Fn cfsetspeed
-function sets both the input and output baud rate in the termios structure
-referenced by
-.Fa termios_p
-to
-.Fa speed .
-.Pp
-Upon successful completion, the functions
-.Fn cfsetispeed ,
-.Fn cfsetospeed ,
-and
-.Fn 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 of the functions, although
-.Fa fildes
-is an open file descriptor, the functions affect the underlying terminal
-file, not just the open file description that is associated
-with the particular file descriptor.
-.Pp
-The
-.Fn cfmakeraw
-function modifies the flags stored in the termios structure 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.
-Because a variety of processing options could be re-enabled,
-the correct method is for an application to snapshot the
-current terminal state using the function
-.Fn tcgetattr ,
-setting raw mode with
-.Fn cfmakeraw
-and the subsequent
-.Fn tcsetattr ,
-and then using another
-.Fn tcsetattr
-with the saved state to revert to the previous terminal state.
-.Pp
-The
-.Fn tcgetattr
-function copies the parameters associated with the terminal referenced
-by
-.Fa fildes
-in the termios structure referenced by
-.Fa termios_p .
-This function is allowed from a background process;
-however, the terminal attributes may be subsequently changed
-by a foreground process.
-.Pp
-The
-.Fn tcsetattr
-function sets the parameters associated with the terminal from the
-termios structure referenced by
-.Fa termios_p .
-The
-.Fa optional_actions
-field is created by
-.Em or Ns 'ing
-the following values, as specified in the include file
-.Aq Pa 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 fildes
-has been transmitted to the terminal.
-This value of
-.Fa optional_actions
-should be used when changing parameters that affect output.
-.It Fa TCSAFLUSH
-The change occurs after all output written to
-.Fa fildes
-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 optional_actions
-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
-.Fn 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
-.Fn tcsetattr ,
-the input baud rate will be set to the same value as that specified by
-the output baud rate.
-.Pp
-If
-.Fn 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
-.Fn tcgetattr
-and
-.Fn 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 fildes
-argument to
-.Fn tcgetattr
-or
-.Fn tcsetattr
-was not a valid file descriptor.
-.It Bq Er EINTR
-The
-.Fn tcsetattr
-function was interrupted by a signal.
-.It Bq Er EINVAL
-The
-.Fa optional_actions
-argument to the
-.Fn 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 fildes
-argument to
-.Fn tcgetattr
-or
-.Fn tcsetattr
-is not a terminal.
-.El
-.Sh SEE ALSO
-.Xr tcsendbreak 3 ,
-.Xr termios 4
-.Sh STANDARDS
-The
-.Fn cfgetispeed ,
-.Fn cfsetispeed ,
-.Fn cfgetospeed ,
-.Fn cfsetospeed ,
-.Fn tcgetattr ,
-and
-.Fn tcsetattr
-functions are expected to be compliant with the
-.St -p1003.1-88
-specification.
-The
-.Fn cfmakeraw
-and
-.Fn cfsetspeed
-functions,
-as well as the
-.Li TCSASOFT
-option to the
-.Fn tcsetattr
-function are extensions to the
-.St -p1003.1-88
-specification.