termios.h(3HEAD) Headers termios.h(3HEAD)NAME
termios.h, termios - define values for termiosSYNOPSIS
#include <termios.h>
DESCRIPTION
The <termios.h> header contains the definitions used by the terminal
I/O interfaces. See termios(3C) and termio(7I) for an overview of the
terminal interface.
The termios Structure
The following data types are defined 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 are all unsigned integer types.
The implementation supports 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(3C) function or the getconf(1) utility.
The termios structure is defined and includes 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 */
A definition is provided for:
NCCS size of the array c_cc for control characters
The following subscript names for the array c_cc are defined:
Subscript Usage Subscript Usage Description
Canonical Mode Non-Canonical Mode
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 are unique, except that the VMIN and VTIME sub‐
scripts can have the same values as the VEOF and VEOL subscripts,
respectively.
The header file provides the flags described below.
Input Modes
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 c_oflag field specifies the system treatment of output:
OPOST Post-process output.
ONLCR Map NL to CR-NL on output.
OCRNL Map CR to NL on output.
ONOCR No CR output at column 0.
ONLRET NL performs CR function.
OFILL Use fill characters for delay.
NLDLY Select newline delays:
NL0 newline type 0
NL1 newline type 1
CRDLY 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 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 Select backspace delays:
BS0 backspace-delay type 0
BS1 backspace-delay type 1
VTDLY Select vertical-tab delays:
VT0 vertical-tab delay type 0
VT1 vertical-tab delay type 1
FFDLY Select form-feed delays:
FF0 form-feed delay type 0
FF1 form-feed delay type 1
Baud Rate Selection
The input and output baud rates are stored in the termios structure.
These are the valid values for objects of type speed_ t. The following
values are defined, but 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 1 200 baud
B1800 1 800 baud
B2400 2 400 baud
B4800 4 800 baud
B9600 9 600 baud
B19200 19 200 baud
B38400 38 400 baud
Control Modes
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 supports the functionality associated with the sym‐
bols CS7, CS8, CSTOPB, PARODD, and PARENB.
Local Modes
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 following symbolic constants for use with tcsetattr() are defined:
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 following symbolic constants for use with tcflush() are defined:
TCIFLUSH Flush pending input.
TCIOFLUSH Flush both pending input and untransmitted output.
TCOFLUSH Flush untransmitted output.
The following symbolic constants for use with tcflow() are defined:
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.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOgetconf(1), cfgetispeed(3C), cfsetispeed(3C), confstr(3C), tcdrain(3C),
tcflow(3C), tcflush(3C), tcgetattr(3C), tcgetsid(3C), tcsendbreak(3C),
tcsetattr(3C), attributes(5), standards(5)SunOS 5.10 10 Sep 2004 termios.h(3HEAD)
