-.\" Hey Emacs! This file is -*- nroff -*- source.
-.\"
-.\" Copyright (c) 1993 Michael Haardt
-.\" (michael@moria.de)
+.\" Copyright (c) 1993 Michael Haardt (michael@moria.de)
.\" Fri Apr 2 11:32:09 MET DST 1993
+.\" Copyright (c) 2006-2015, Michael Kerrisk <mtk.manpages@gmail.com>
.\"
+.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public
-.\" License along with this manual; if not, write to the Free
-.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
-.\" USA.
+.\" License along with this manual; if not, see
+.\" <http://www.gnu.org/licenses/>.
+.\" %%%LICENSE_END
.\"
.\" Modified 1993-07-24 by Rik Faith <faith@cs.unc.edu>
.\" Modified 1995-02-25 by Jim Van Zandt <jrv@vanzandt.mv.com>
.\" Enhanced the discussion of "raw" mode for cfmakeraw().
.\" Document CMSPAR.
.\"
-.TH TERMIOS 3 2011-09-08 "Linux" "Linux Programmer's Manual"
+.TH TERMIOS 3 2019-03-06 "Linux" "Linux Programmer's Manual"
.SH NAME
termios, tcgetattr, tcsetattr, tcsendbreak, tcdrain, tcflush, tcflow,
cfmakeraw, cfgetospeed, cfgetispeed, cfsetispeed, cfsetospeed, cfsetspeed \-
.SH SYNOPSIS
.nf
.B #include <termios.h>
-.br
.B #include <unistd.h>
-.sp
+.PP
.BI "int tcgetattr(int " fd ", struct termios *" termios_p );
-.sp
+.PP
.BI "int tcsetattr(int " fd ", int " optional_actions ,
.BI " const struct termios *" termios_p );
-.sp
+.PP
.BI "int tcsendbreak(int " fd ", int " duration );
-.sp
+.PP
.BI "int tcdrain(int " fd );
-.sp
+.PP
.BI "int tcflush(int " fd ", int " queue_selector );
-.sp
+.PP
.BI "int tcflow(int " fd ", int " action );
-.sp
+.PP
.BI "void cfmakeraw(struct termios *" termios_p );
-.sp
+.PP
.BI "speed_t cfgetispeed(const struct termios *" termios_p );
-.sp
+.PP
.BI "speed_t cfgetospeed(const struct termios *" termios_p );
-.sp
+.PP
.BI "int cfsetispeed(struct termios *" termios_p ", speed_t " speed );
-.sp
+.PP
.BI "int cfsetospeed(struct termios *" termios_p ", speed_t " speed );
-.sp
+.PP
.BI "int cfsetspeed(struct termios *" termios_p ", speed_t " speed );
.fi
-.sp
+.PP
.in -4n
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
-.sp
+.PP
.BR cfsetspeed (),
.BR cfmakeraw ():
-_BSD_SOURCE
+ Since glibc 2.19:
+ _DEFAULT_SOURCE
+ Glibc 2.19 and earlier:
+ _BSD_SOURCE
.SH DESCRIPTION
The termios functions describe a general terminal interface that is
provided to control asynchronous communications ports.
-.SS "The termios structure"
-.LP
+.SS The termios structure
+.PP
Many of the functions described here have a \fItermios_p\fP argument
that is a pointer to a \fItermios\fP structure.
This structure contains at least the following members:
-.sp
+.PP
.in +4n
-.nf
+.EX
tcflag_t c_iflag; /* input modes */
tcflag_t c_oflag; /* output modes */
tcflag_t c_cflag; /* control modes */
tcflag_t c_lflag; /* local modes */
cc_t c_cc[NCCS]; /* special characters */
-.fi
+.EE
.in
.PP
The values that may be assigned to these fields are described below.
In the case of the first four bit-mask fields,
the definitions of some of the associated flags that may be set are
-only exposed if a specific feature test macro (see
+exposed only if a specific feature test macro (see
.BR feature_test_macros (7))
is defined, as noted in brackets ("[]").
.PP
terminal of a foreground process group, it will cause a
\fBSIGINT\fP to be sent to this foreground process group.
When neither \fBIGNBRK\fP nor \fBBRKINT\fP are set, a BREAK
-reads as a null byte (\(aq\\0\(aq), except when \fBPARMRK\fP is set,
-in which case it reads as the sequence \\377 \\0 \\0.
+reads as a null byte (\(aq\e0\(aq), except when \fBPARMRK\fP is set,
+in which case it reads as the sequence \e377 \e0 \e0.
.TP
.B IGNPAR
Ignore framing errors and parity errors.
.TP
.B PARMRK
-If \fBIGNPAR\fP is not set, prefix a character with a parity error or
-framing error with \\377 \\0.
+If this bit is set, input bytes with parity or framing errors are
+marked when passed to the program.
+This bit is meaningful only when
+\fBINPCK\fP is set and \fBIGNPAR\fP is not set.
+The way erroneous bytes are marked is with two preceding bytes,
+\e377 and \e0.
+Thus, the program actually reads three bytes for one
+erroneous byte received from the terminal.
+If a valid byte has the value \e377,
+and \fBISTRIP\fP (see below) is not set,
+the program might confuse it with the prefix that marks a
+parity error.
+Therefore, a valid byte \e377 is passed to the program as two
+bytes, \e377 \e377, in this case.
+.IP
If neither \fBIGNPAR\fP nor \fBPARMRK\fP
is set, read a character with a parity error or framing error
-as \\0.
+as \e0.
.TP
.B INPCK
Enable input parity checking.
(not in POSIX) Input is UTF8;
this allows character-erase to be correctly performed in cooked mode.
.PP
-\fIc_oflag\fP flag constants defined in POSIX.1:
+.I c_oflag
+flag constants:
.TP
.B OPOST
Enable implementation-defined output processing.
-.PP
-The remaining \fIc_oflag\fP flag constants are defined in POSIX.1-2001,
-unless marked otherwise.
.TP
.B OLCUC
(not in POSIX) Map lowercase characters to uppercase on output.
Send fill characters for a delay, rather than using a timed delay.
.TP
.B OFDEL
-(not in POSIX) Fill character is ASCII DEL (0177).
-If unset, fill character is ASCII NUL (\(aq\\0\(aq).
+Fill character is ASCII DEL (0177).
+If unset, fill character is ASCII NUL (\(aq\e0\(aq).
(Not implemented on Linux.)
.TP
.B NLDLY
.TP
.B TABDLY
Horizontal tab delay mask.
-Values are \fBTAB0\fP, \fBTAB1\fP, \fBTAB2\fP, \fBTAB3\fP (or \fBXTABS\fP).
+Values are \fBTAB0\fP, \fBTAB1\fP, \fBTAB2\fP, \fBTAB3\fP (or \fBXTABS\fP,
+but see the
+.B BUGS
+section).
A value of TAB3, that is, XTABS, expands tabs to spaces
(with tab stops every eight columns).
[requires
.B _BSD_SOURCE
or
.BR _SVID_SOURCE ]
-.sp
+.IP
(POSIX says that the baud speed is stored in the
.I termios
structure without specifying where precisely, and provides
.B PARODD
is set, the parity bit is always 1; if
.B PARODD
-is not set, then the parity bit is always 0).
+is not set, then the parity bit is always 0.
[requires
.B _BSD_SOURCE
or
.B XCASE
(not in POSIX; not supported under Linux)
If \fBICANON\fP is also set, terminal is uppercase only.
-Input is converted to lowercase, except for characters preceded by \\.
-On output, uppercase characters are preceded by \\ and lowercase
+Input is converted to lowercase, except for characters preceded by \e.
+On output, uppercase characters are preceded by \e and lowercase
characters are converted to uppercase.
-[requires _BSD_SOURCE or _SVID_SOURCE or _XOPEN_SOURCE]
+[requires
+.B _BSD_SOURCE
+or
+.B _SVID_SOURCE
+or
+.BR _XOPEN_SOURCE ]
.\" glibc is probably now wrong to allow
.\" Define
.\" .B _XOPEN_SOURCE
.BR _SVID_SOURCE ]
.TP
.B ECHOPRT
-(not in POSIX) If \fBICANON\fP and \fBIECHO\fP are also set, characters
+(not in POSIX) If \fBICANON\fP and \fBECHO\fP are also set, characters
are printed as they are being erased.
[requires
.B _BSD_SOURCE
The \fIc_cc\fP array defines the terminal special characters.
The symbolic indices (initial values) and meaning are:
.TP
-.B VINTR
-(003, ETX, Ctrl-C, or also 0177, DEL, rubout)
-Interrupt character.
-Send a
-.B SIGINT
-signal.
+.B VDISCARD
+(not in POSIX; not supported under Linux; 017, SI, Ctrl-O)
+Toggle: start/stop discarding pending output.
Recognized when
-.B ISIG
+.B IEXTEN
is set, and then not passed as input.
.TP
-.B VQUIT
-(034, FS, Ctrl-\e)
-Quit character.
-Send
-.B SIGQUIT
-signal.
+.B VDSUSP
+(not in POSIX; not supported under Linux; 031, EM, Ctrl-Y)
+Delayed suspend character (DSUSP):
+send
+.B SIGTSTP
+signal when the character is read by the user program.
Recognized when
+.B IEXTEN
+and
.B ISIG
+are set, and the system supports
+job control, and then not passed as input.
+.TP
+.B VEOF
+(004, EOT, Ctrl-D)
+End-of-file character (EOF).
+More precisely: this character causes the pending tty buffer to be sent
+to the waiting user program without waiting for end-of-line.
+If it is the first character of the line, the
+.BR read (2)
+in the user program returns 0, which signifies end-of-file.
+Recognized when
+.B ICANON
is set, and then not passed as input.
.TP
+.B VEOL
+(0, NUL)
+Additional end-of-line character (EOL).
+Recognized when
+.B ICANON
+is set.
+.TP
+.B VEOL2
+(not in POSIX; 0, NUL)
+Yet another end-of-line character (EOL2).
+Recognized when
+.B ICANON
+is set.
+.TP
.B VERASE
(0177, DEL, rubout, or 010, BS, Ctrl-H, or also #)
-Erase character.
+Erase character (ERASE).
This erases the previous not-yet-erased character,
but does not erase past EOF or beginning-of-line.
Recognized when
.B ICANON
is set, and then not passed as input.
.TP
+.B VINTR
+(003, ETX, Ctrl-C, or also 0177, DEL, rubout)
+Interrupt character (INTR).
+Send a
+.B SIGINT
+signal.
+Recognized when
+.B ISIG
+is set, and then not passed as input.
+.TP
.B VKILL
(025, NAK, Ctrl-U, or Ctrl-X, or also @)
-Kill character.
+Kill character (KILL).
This erases the input since the last EOF or beginning-of-line.
Recognized when
.B ICANON
is set, and then not passed as input.
.TP
-.B VEOF
-(004, EOT, Ctrl-D)
-End-of-file character.
-More precisely: this character causes the pending tty buffer to be sent
-to the waiting user program without waiting for end-of-line.
-If it is the first character of the line, the
-.BR read (2)
-in the user program returns 0, which signifies end-of-file.
+.B VLNEXT
+(not in POSIX; 026, SYN, Ctrl-V)
+Literal next (LNEXT).
+Quotes the next input character, depriving it of
+a possible special meaning.
Recognized when
-.B ICANON
+.B IEXTEN
is set, and then not passed as input.
.TP
.B VMIN
-Minimum number of characters for noncanonical read.
+Minimum number of characters for noncanonical read (MIN).
.TP
-.B VEOL
-(0, NUL)
-Additional end-of-line character.
+.B VQUIT
+(034, FS, Ctrl-\e)
+Quit character (QUIT).
+Send
+.B SIGQUIT
+signal.
Recognized when
-.B ICANON
-is set.
-.TP
-.B VTIME
-Timeout in deciseconds for noncanonical read.
+.B ISIG
+is set, and then not passed as input.
.TP
-.B VEOL2
-(not in POSIX; 0, NUL)
-Yet another end-of-line character.
+.B VREPRINT
+(not in POSIX; 022, DC2, Ctrl-R)
+Reprint unread characters (REPRINT).
Recognized when
.B ICANON
-is set.
-.TP
-.B VSWTCH
-(not in POSIX; not supported under Linux; 0, NUL)
-Switch character.
-(Used by \fBshl\fP only.)
+and
+.B IEXTEN
+are set, and then not passed as input.
.TP
.B VSTART
(021, DC1, Ctrl-Q)
-Start character.
+Start character (START).
Restarts output stopped by the Stop character.
Recognized when
.B IXON
is set, and then not passed as input.
.TP
+.B VSTATUS
+(not in POSIX; not supported under Linux;
+status request: 024, DC4, Ctrl-T).
+Status character (STATUS).
+Display status information at terminal,
+including state of foreground process and amount of CPU time it has consumed.
+Also sends a
+.B SIGINFO
+signal (not supported on Linux) to the foreground process group.
+.TP
.B VSTOP
(023, DC3, Ctrl-S)
-Stop character.
+Stop character (STOP).
Stop output until Start character typed.
Recognized when
.B IXON
.TP
.B VSUSP
(032, SUB, Ctrl-Z)
-Suspend character.
+Suspend character (SUSP).
Send
.B SIGTSTP
signal.
.B ISIG
is set, and then not passed as input.
.TP
-.B VDSUSP
-(not in POSIX; not supported under Linux; 031, EM, Ctrl-Y)
-Delayed suspend character:
-send
-.B SIGTSTP
-signal when the character is read by the user program.
-Recognized when
-.B IEXTEN
-and
-.B ISIG
-are set, and the system supports
-job control, and then not passed as input.
+.B VSWTCH
+(not in POSIX; not supported under Linux; 0, NUL)
+Switch character (SWTCH).
+Used in System V to switch shells in
+.IR "shell layers" ,
+a predecessor to shell job control.
.TP
-.B VLNEXT
-(not in POSIX; 026, SYN, Ctrl-V)
-Literal next.
-Quotes the next input character, depriving it of
-a possible special meaning.
-Recognized when
-.B IEXTEN
-is set, and then not passed as input.
+.B VTIME
+Timeout in deciseconds for noncanonical read (TIME).
.TP
.B VWERASE
(not in POSIX; 027, ETB, Ctrl-W)
-Word erase.
-Recognized when
-.B ICANON
-and
-.B IEXTEN
-are set, and then not passed as input.
-.TP
-.B VREPRINT
-(not in POSIX; 022, DC2, Ctrl-R)
-Reprint unread characters.
+Word erase (WERASE).
Recognized when
.B ICANON
and
.B IEXTEN
are set, and then not passed as input.
-.TP
-.B VDISCARD
-(not in POSIX; not supported under Linux; 017, SI, Ctrl-O)
-Toggle: start/stop discarding pending output.
-Recognized when
-.B IEXTEN
-is set, and then not passed as input.
-.TP
-.B VSTATUS
-(not in POSIX; not supported under Linux;
-status request: 024, DC4, Ctrl-T).
-.LP
+.PP
An individual terminal special character can be disabled by setting
the value of the corresponding
.I c_cc
element to
.BR _POSIX_VDISABLE .
-.LP
+.PP
The above symbolic subscript values are all different, except that
.BR VTIME ,
.B VMIN
.BR VTIME ,
see the description of
noncanonical mode below.
-.SS "Retrieving and changing terminal settings"
+.SS Retrieving and changing terminal settings
.PP
.BR tcgetattr ()
gets the parameters associated with the object referred by \fIfd\fP and
This function may be invoked from a background process;
however, the terminal attributes may be subsequently changed by a
foreground process.
-.LP
+.PP
.BR tcsetattr ()
sets the parameters associated with the terminal (unless support is
required from the underlying hardware that is not available) from the
the change occurs after all output written to
.I fd
has been transmitted.
-This function should be used when changing
+This option should be used when changing
parameters that affect output.
.IP \fBTCSAFLUSH\fP
the change occurs after all output written to the object referred by
.I fd
has been transmitted, and all input that has been received but not read
will be discarded before the change is made.
-.SS "Canonical and noncanonical mode"
+.SS Canonical and noncanonical mode
The setting of the
.B ICANON
canon flag in
unset).
By default,
.B ICANON
-set.
-
+is set.
+.PP
In canonical mode:
.IP * 2
Input is made available line by line.
then only as many bytes as requested are read,
and the remaining characters will be available for a future
.BR read (2).
+.IP * 2
+The maximum line length is 4096 chars
+(including the terminating newline character);
+lines longer than 4096 chars are truncated.
+After 4095 characters, input processing (e.g.,
+.B ISIG
+and
+.B ECHO*
+processing) continues, but any input data after 4095 characters up to
+(but not including) any terminating newline is discarded.
+This ensures that the terminal can always receive
+more input until at least one line can be read.
.PP
In noncanonical mode input is available immediately (without
the user having to type a line-delimiter character),
+no input processing is performed,
and line editing is disabled.
+The read buffer will only accept 4095 chars; this provides the
+necessary space for a newline char if the input mode is switched
+to canonical.
The settings of MIN
.RI ( c_cc[VMIN] )
and TIME
determine the circumstances in which a
.BR read (2)
completes; there are four distinct cases:
-.IP * 2
-MIN == 0; TIME == 0:
+.TP
+MIN == 0, TIME == 0 (polling read)
If data is available,
.BR read (2)
returns immediately, with the lesser of the number of bytes
If no data is available,
.BR read (2)
returns 0.
-.IP * 2
-MIN > 0; TIME == 0:
+.TP
+MIN > 0, TIME == 0 (blocking read)
.BR read (2)
-blocks until the lesser of MIN bytes or the number of bytes requested
-are available, and returns the lesser of these two values.
-.IP * 2
-MIN == 0; TIME > 0:
+blocks until MIN bytes are available,
+and returns up to the number of bytes requested.
+.TP
+MIN == 0, TIME > 0 (read with timeout)
TIME specifies the limit for a timer in tenths of a second.
The timer is started when
.BR read (2)
If the timer expires without any input becoming available,
.BR read (2)
returns 0.
-.IP * 2
-MIN > 0; TIME > 0:
+If data is already available at the time of the call to
+.BR read (2),
+the call behaves as though the data was received immediately after the call.
+.TP
+MIN > 0, TIME > 0 (read with interbyte timeout)
TIME specifies the limit for a timer in tenths of a second.
Once an initial byte of input becomes available,
the timer is restarted after each further byte is received.
.BR read (2)
-returns either when the lesser of the number of bytes requested or
-MIN byte have been read,
-or when the inter-byte timeout expires.
-Because the timer is only started after the initial byte
+returns when any of the following conditions is met:
+.RS
+.IP * 3
+MIN bytes have been received.
+.IP *
+The interbyte timer expires.
+.IP *
+The number of bytes requested by
+.BR read (2)
+has been received.
+(POSIX does not specify this termination condition,
+and on some other implementations
+.\" e.g., Solaris
+.BR read (2)
+does not return in this case.)
+.RE
+.IP
+Because the timer is started only after the initial byte
becomes available, at least one byte will be read.
-.SS "Raw mode"
-.LP
+If data is already available at the time of the call to
+.BR read (2),
+the call behaves as though the data was received immediately after the call.
+.PP
+POSIX
+.\" POSIX.1-2008 XBD 11.1.7
+does not specify whether the setting of the
+.B O_NONBLOCK
+file status flag takes precedence over the MIN and TIME settings.
+If
+.B O_NONBLOCK
+is set, a
+.BR read (2)
+in noncanonical mode may return immediately,
+regardless of the setting of MIN or TIME.
+Furthermore, if no data is available,
+POSIX permits a
+.BR read (2)
+in noncanonical mode to return either 0, or \-1 with
+.I errno
+set to
+.BR EAGAIN .
+.SS Raw mode
+.PP
.BR cfmakeraw ()
sets the terminal to something like the
"raw" mode of the old Version 7 terminal driver:
echoing is disabled, and all special processing of
terminal input and output characters is disabled.
The terminal attributes are set as follows:
-.nf
-
- termios_p\->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
- | INLCR | IGNCR | ICRNL | IXON);
- termios_p\->c_oflag &= ~OPOST;
- termios_p\->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
- termios_p\->c_cflag &= ~(CSIZE | PARENB);
- termios_p\->c_cflag |= CS8;
-.fi
-.SS "Line control"
-.LP
+.PP
+.in +4n
+.EX
+termios_p\->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
+ | INLCR | IGNCR | ICRNL | IXON);
+termios_p\->c_oflag &= ~OPOST;
+termios_p\->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
+termios_p\->c_cflag &= ~(CSIZE | PARENB);
+termios_p\->c_cflag |= CS8;
+.EE
+.in
+.\"
+.SS Line control
+.PP
.BR tcsendbreak ()
transmits a continuous stream of zero-valued bits for a specific
duration, if the terminal is using asynchronous serial data
for at least 0.25 seconds, and not more that 0.5 seconds.
If \fIduration\fP is not zero, it sends zero-valued bits for some
implementation-defined length of time.
-.LP
+.PP
If the terminal is not using asynchronous serial data transmission,
.BR tcsendbreak ()
returns without taking any action.
-.LP
+.PP
.BR tcdrain ()
waits until all output written to the object referred to by
.I fd
has been transmitted.
-.LP
+.PP
.BR tcflush ()
discards data written to the object referred to by
.I fd
.IP \fBTCIOFLUSH\fP
flushes both data received but not read, and data written but not
transmitted.
-.LP
+.PP
.BR tcflow ()
suspends transmission or reception of data on the object referred to by
.IR fd ,
.IP \fBTCION\fP
transmits a START character, which starts the terminal device
transmitting data to the system.
-.LP
+.PP
The default on open of a terminal file is that neither its input nor its
output is suspended.
-.SS "Line speed"
+.SS Line speed
The baud rate functions are provided for getting and setting the values
of the input and output baud rates in the \fItermios\fP structure.
The new values do not take effect
until
.BR tcsetattr ()
is successfully called.
-
+.PP
Setting the speed to \fBB0\fP instructs the modem to "hang up".
The actual bit rate corresponding to \fBB38400\fP may be altered with
.BR setserial (8).
-.LP
+.PP
The input and output baud rates are stored in the \fItermios\fP
structure.
-.LP
+.PP
.BR cfgetospeed ()
returns the output baud rate stored in the \fItermios\fP structure
pointed to by
.IR termios_p .
-.LP
+.PP
.BR cfsetospeed ()
sets the output baud rate stored in the \fItermios\fP structure pointed
to by \fItermios_p\fP to \fIspeed\fP, which must be one of these constants:
+.PP
.nf
-
.ft B
B0
B50
B115200
B230400
.ft P
-
.fi
+.PP
The zero baud rate, \fBB0\fP,
is used to terminate the connection.
If B0 is specified, the modem control lines shall no longer be asserted.
\fBCBAUDEX\fP is a mask
for the speeds beyond those defined in POSIX.1 (57600 and above).
Thus, \fBB57600\fP & \fBCBAUDEX\fP is nonzero.
-.LP
+.PP
.BR cfgetispeed ()
returns the input baud rate stored in the \fItermios\fP structure.
-.LP
+.PP
.BR cfsetispeed ()
sets the input baud rate stored in the \fItermios\fP structure to
.IR speed ,
.BR cfsetospeed ().
If the input baud rate is set to zero, the input baud rate will be
equal to the output baud rate.
-.LP
+.PP
.BR cfsetspeed ()
is a 4.4BSD extension.
It takes the same arguments as
.BR cfsetispeed (),
and sets both input and output speed.
-.SH "RETURN VALUE"
-.LP
+.SH RETURN VALUE
+.PP
.BR cfgetispeed ()
returns the input baud rate stored in the
\fItermios\fP
structure.
-.LP
+.PP
.BR cfgetospeed ()
returns the output baud rate stored in the \fItermios\fP structure.
-.LP
+.PP
All other functions return:
.IP 0
on success.
on failure and set
.I errno
to indicate the error.
-.LP
+.PP
Note that
.BR tcsetattr ()
returns success if \fIany\fP of the requested changes could be
it may be necessary to follow this call with a further call to
.BR tcgetattr ()
to check that all changes have been performed successfully.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.nh
+.ad l
+.TS
+allbox;
+lbw36 lb lb
+l l l.
+Interface Attribute Value
+T{
+.BR tcgetattr (),
+.BR tcsetattr (),
+.BR tcdrain (),
+.BR tcflush (),
+.BR tcflow (),
+.BR tcsendbreak (),
+.BR cfmakeraw (),
+.BR cfgetispeed (),
+.BR cfgetospeed (),
+.BR cfsetispeed (),
+.BR cfsetospeed (),
+.BR cfsetspeed ()
+T} Thread safety MT-Safe
+.TE
+.\" FIXME: The markings are different from that in the glibc manual.
+.\" markings in glibc manual are more detailed:
+.\"
+.\" tcsendbreak: MT-Unsafe race:tcattr(filedes)/bsd
+.\" tcflow: MT-Unsafe race:tcattr(filedes)/bsd
+.\"
+.\" glibc manual says /bsd indicate the preceding marker only applies
+.\" when the underlying kernel is a BSD kernel.
+.\" So, it is safety in Linux kernel.
+.ad
+.hy
.SH CONFORMING TO
.BR tcgetattr (),
.BR tcsetattr (),
and
.BR cfsetospeed ()
are specified in POSIX.1-2001.
-
+.PP
.BR cfmakeraw ()
and
.BR cfsetspeed ()
are nonstandard, but available on the BSDs.
.SH NOTES
-UNIX V7 and several later systems have a list of baud rates
+UNIX\ V7 and several later systems have a list of baud rates
where after the fourteen values B0, ..., B9600 one finds the
two constants EXTA, EXTB ("External A" and "External B").
Many systems extend the list with much higher baud rates.
-.LP
+.PP
The effect of a nonzero \fIduration\fP with
.BR tcsendbreak ()
varies.
.\" libc4.7.6, libc5, glibc for unix: duration in ms.
.\" glibc for bsd: duration in us
.\" glibc for sunos4: ignore duration
-.SH "SEE ALSO"
+.SH BUGS
+.\" kernel 77e5bff1640432f28794a00800955e646dcd7455
+.\" glibc 573963e32ffac46d9891970ddebde2ac3212c5c0
+On the Alpha architecture before Linux 4.16 (and glibc before 2.28), the
+.B XTABS
+value was different from
+.B TAB3
+and it was ignored by the
+.B N_TTY
+line discipline code of the terminal driver as a result
+(because as it wasn't part of the
+.B TABDLY
+mask).
+.SH SEE ALSO
+.BR reset (1),
+.BR setterm (1),
.BR stty (1),
-.BR console_ioctl (4),
-.BR tty_ioctl (4),
+.BR tput (1),
+.BR tset (1),
+.BR tty (1),
+.BR ioctl_console (2),
+.BR ioctl_tty (2),
.BR setserial (8)
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