What does Termios stand for?

What does Termios stand for?

DESCRIPTION top. The termios functions describe a general terminal interface that is provided to control asynchronous communications ports. The termios structure Many of the functions described here have a termios_p argument that is a pointer to a termios structure.

What is C_lflag?

c_iflag and c_oflag contain flags that affect the processing of input and output, respectively. c_cflag we will mostly ignore, as it contains settings that relate to the control of modems and serial lines that are mostly irrelevant these days. c_lflag is perhaps the most interesting of the flag values.

What does Tcgetattr do in Linux?

Description: The tcgetattr() function gets the current terminal control settings for the opened device indicated by fildes , and stores the results in the structure pointed to by termios_p .

What is canonical input?

In canonical input mode, the operating system provides input editing facilities: some characters are interpreted specially to perform editing operations within the current line of text, such as ERASE and KILL. See Editing Characters.

What is Termios in Linux?

What is noncanonical read?

In noncanonical input processing mode, characters are not grouped into lines, and ERASE and KILL processing is not performed. The granularity with which bytes are read in noncanonical input mode is controlled by the MIN and TIME settings.

What is Cbreak mode?

cbreak mode (sometimes called rare mode) is a mode between raw mode and cooked mode. Unlike cooked mode it works with single characters at a time, rather than forcing a wait for a whole line and then feeding the line in all at once.

Which terminal does no processing on input characters?

Dumb terminal does no processing on input characters .

What does STTY raw do?

The raw setting means that the input and output is not processed, just sent straight through. Processing can be things like ignoring certain characters, translating characters into other characters, allowing interrupt signals etc. So with stty raw you can’t hit Ctrl-C to end a process, for example.

What is termio in Linux?

termio is the name of the old System V terminal driver interface. This interface defined a termio structure used to store terminal settings, and a range of ioctl (2) operations to get and set terminal attributes. The termio interface is now obsolete: POSIX.1-1990 standardized a modified version of this interface, under the name termios.

What should be included in the header?

The header shall contain the definitions used by the terminal I/O interfaces (see Chapter 11, General Terminal Interface for the structures and names defined).

What is a termios_P argument?

The termios functions describe a general terminal interface that is provided to control asynchronous communications ports. Many of the functions described here have a termios_p argument that is a pointer to a termios structure. This structure contains at least the following members:

What are the members of the termios structure?

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.