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The Open Group Base Specifications Issue 7, 2018 edition
IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)
Copyright © 2001-2018 IEEE and The Open Group
A newer edition of this document exists
here
NAME
termios.h - define values for termios
SYNOPSIS
#include
DESCRIPTION
The
header shall contain the definitions used by the terminal I/O interfaces (see
General Terminal Interface
for the structures and names defined).
The termios Structure
The
header shall define the following data types through
typedef
cc_t
Used for terminal special characters.
speed_t
Used for terminal baud rates.
tcflag_t
Used for terminal modes.
The above types shall be all unsigned integer types.
The implementation shall support one or more programming environments in which the widths of
cc_t
speed_t
, and
tcflag_t
are no greater than the width of type
long
. The names of these programming environments can be obtained
using the
confstr
()
function or the
getconf
utility.
The
header shall define the
termios
structure, which shall include at least the following
members:
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]
Control characters.
The
header shall define the following symbolic constant:
NCCS
Size of the array
c_cc
for control characters.
The
header shall define the following symbolic constants for use as subscripts for the array
c_cc
Subscript Usage
Canonical Mode
Non-Canonical Mode
Description
VEOF
EOF character.
VEOL
EOL character.
VERASE
ERASE character.
VINTR
VINTR
INTR character.
VKILL
KILL character.
VMIN
MIN value.
VQUIT
VQUIT
QUIT character.
VSTART
VSTART
START character.
VSTOP
VSTOP
STOP character.
VSUSP
VSUSP
SUSP character.
VTIME
TIME value.
The subscript values shall be suitable for use in
#if
preprocessing directives and shall be distinct, except that the
VMIN and VTIME subscripts may have the same values as the VEOF and VEOL subscripts, respectively.
Input Modes
The
header shall define the following symbolic constants for use as flags in the
c_iflag
field.
The
c_iflag
field describes the basic terminal input control.
BRKINT
Signal interrupt on break.
ICRNL
Map CR to NL on input.
IGNBRK
Ignore break condition.
IGNCR
Ignore CR.
IGNPAR
Ignore characters with parity errors.
INLCR
Map NL to CR on input.
INPCK
Enable input parity check.
ISTRIP
Strip character.
IXANY
Enable any character to restart output.
IXOFF
Enable start/stop input control.
IXON
Enable start/stop output control.
PARMRK
Mark parity errors.
Output Modes
The
header shall define the following symbolic constants for use as flags in the
c_oflag
field.
The
c_oflag
field specifies the system treatment of output.
OPOST
Post-process output.
ONLCR
XSI
Map NL to CR-NL on output.
OCRNL
XSI
Map CR to NL on output.
ONOCR
XSI
No CR output at column 0.
ONLRET
XSI
NL performs CR function.
OFDEL
XSI
Fill is DEL.
OFILL
XSI
Use fill characters for delay.
NLDLY
XSI
Select newline delays:
NL0
Newline type 0.
NL1
Newline type 1.
CRDLY
XSI
Select carriage-return delays:
CR0
Carriage-return delay type 0.
CR1
Carriage-return delay type 1.
CR2
Carriage-return delay type 2.
CR3
Carriage-return delay type 3.
TABDLY
XSI
Select horizontal-tab delays:
TAB0
Horizontal-tab delay type 0.
TAB1
Horizontal-tab delay type 1.
TAB2
Horizontal-tab delay type 2.
TAB3
Expand tabs to spaces.
BSDLY
XSI
Select backspace delays:
BS0
Backspace-delay type 0.
BS1
Backspace-delay type 1.
VTDLY
XSI
Select vertical-tab delays:
VT0
Vertical-tab delay type 0.
VT1
Vertical-tab delay type 1.
FFDLY
XSI
Select form-feed delays:
FF0
Form-feed delay type 0.
FF1
Form-feed delay type 1.
Baud Rate Selection
The
header shall define the following symbolic constants for use as values of objects of type
speed_t
The input and output baud rates are stored in the
termios
structure. These are the valid values for objects of type
speed_t
. Not all baud rates need be supported by the underlying hardware.
B0
Hang up
B50
50 baud
B75
75 baud
B110
110 baud
B134
134.5 baud
B150
150 baud
B200
200 baud
B300
300 baud
B600
600 baud
B1200
1200 baud
B1800
1800 baud
B2400
2400 baud
B4800
4800 baud
B9600
9600 baud
B19200
19200 baud
B38400
38400 baud
Control Modes
The
header shall define the following symbolic constants for use as flags in the
c_cflag
field.
The
c_cflag
field describes the hardware control of the terminal; not all values specified are required to be supported by
the underlying hardware.
CSIZE
Character size:
CS5
5 bits
CS6
6 bits
CS7
7 bits
CS8
8 bits
CSTOPB
Send two stop bits, else one.
CREAD
Enable receiver.
PARENB
Parity enable.
PARODD
Odd parity, else even.
HUPCL
Hang up on last close.
CLOCAL
Ignore modem status lines.
The implementation shall support the functionality associated with the symbols CS7, CS8, CSTOPB, PARODD, and PARENB.
Local Modes
The
header shall define the following symbolic constants for use as flags in the
c_lflag
field.
The
c_lflag
field of the argument structure is used to control various terminal functions.
ECHO
Enable echo.
ECHOE
Echo erase character as error-correcting backspace.
ECHOK
Echo KILL.
ECHONL
Echo NL.
ICANON
Canonical input (erase and kill processing).
IEXTEN
Enable extended input character processing.
ISIG
Enable signals.
NOFLSH
Disable flush after interrupt or quit.
TOSTOP
Send SIGTTOU for background output.
Attribute Selection
The
header shall define the following symbolic constants for use with
tcsetattr
()
TCSANOW
Change attributes immediately.
TCSADRAIN
Change attributes when output has drained.
TCSAFLUSH
Change attributes when output has drained; also flush pending input.
Line Control
The
header shall define the following symbolic constants for use with
tcflush
()
TCIFLUSH
Flush pending input.
TCIOFLUSH
Flush both pending input and untransmitted output.
TCOFLUSH
Flush untransmitted output.
The
header shall define the following symbolic constants for use with
tcflow
()
TCIOFF
Transmit a STOP character, intended to suspend input data.
TCION
Transmit a START character, intended to restart input data.
TCOOFF
Suspend output.
TCOON
Restart output.
The
header shall define the
pid_t
type as described in
The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.
speed_t cfgetispeed(const struct termios *);
speed_t cfgetospeed(const struct termios *);
int cfsetispeed(struct termios *, speed_t);
int cfsetospeed(struct termios *, speed_t);
int tcdrain(int);
int tcflow(int, int);
int tcflush(int, int);
int tcgetattr(int, struct termios *);
pid_t tcgetsid(int);
int tcsendbreak(int, int);
int tcsetattr(int, int, const struct termios *);
The following sections are informative.
APPLICATION USAGE
The following names are reserved for XSI-conformant systems to use as an extension to the above; therefore strictly conforming
applications shall not use them:
CBAUD
EXTB
VDSUSP
DEFECHO
FLUSHO
VLNEXT
ECHOCTL
LOBLK
VREPRINT
ECHOKE
PENDIN
VSTATUS
ECHOPRT
SWTCH
VWERASE
EXTA
VDISCARD
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
XSH
cfgetispeed
cfgetospeed
cfsetispeed
cfsetospeed
confstr
tcdrain
tcflow
tcflush
tcgetattr
tcgetsid
tcsendbreak
tcsetattr
XCU
General Terminal Interface
getconf
CHANGE HISTORY
First released in Issue 3.
Included for alignment with the ISO POSIX-1 standard.
Issue 6
The LEGACY symbols IUCLC, OLCUC, and XCASE are removed.
FIPS 151-2 requirements for the symbols CS7, CS8, CSTOPB, PARODD, and PARENB are reaffirmed.
IEEE Std 1003.1-2001/Cor 1-2002, item XBD/TC1/D6/19 is applied, changing ECHOK to ECHOKE in the APPLICATION USAGE
section.
Issue 7
Austin Group Interpretation 1003.1-2001 #144 is applied, moving functionality relating to the IXANY symbol from the XSI option
to the Base.
SD5-XBD-ERN-35 is applied, adding the OFDEL output mode.
This reference page is clarified with respect to macros and symbolic constants, and a declaration for the
pid_t
type is
added.
End of informative text.
return to top of page
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POSIX ™ is a Trademark of The IEEE.
Copyright © 2001-2018 IEEE and The Open Group, All Rights Reserved
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XBD
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