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The GNU C Library

17.4.1 Terminal Mode Data Types

The entire collection of attributes of a terminal is stored in a structure of type struct termios. This structure is used with the functions tcgetattr and tcsetattr to read and set the attributes.

Data Type: struct termios

Structure that records all the I/O attributes of a terminal. The structure includes at least the following members:

tcflag_t c_iflag

A bit mask specifying flags for input modes; see 17.4.4 Input Modes.

tcflag_t c_oflag

A bit mask specifying flags for output modes; see 17.4.5 Output Modes.

tcflag_t c_cflag

A bit mask specifying flags for control modes; see 17.4.6 Control Modes.

tcflag_t c_lflag

A bit mask specifying flags for local modes; see 17.4.7 Local Modes.

cc_t c_cc[NCCS]

An array specifying which characters are associated with various control functions; see 17.4.9 Special Characters.

The struct termios structure also contains members which encode input and output transmission speeds, but the representation is not specified. See section 17.4.8 Line Speed, for how to examine and store the speed values.

The following sections describe the details of the members of the struct termios structure.

Data Type: tcflag_t

This is an unsigned integer type used to represent the various bit masks for terminal flags.

Data Type: cc_t

This is an unsigned integer type used to represent characters associated with various terminal control functions.

Macro: int NCCS

The value of this macro is the number of elements in the c_cc array.