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17.5 BSD Terminal Modes

The usual way to get and set terminal modes is with the functions described in Terminal Modes. However, on some systems you can use the BSD-derived functions in this section to do some of the same thing. On many systems, these functions do not exist. Even with the GNU C Library, the functions simply fail with errno = ENOSYS with many kernels, including Linux.

The symbols used in this section are declared in sgtty.h.

— Data Type: struct sgttyb

This structure is an input or output parameter list for gtty and stty.

char sg_ispeed
Line speed for input
char sg_ospeed
Line speed for output
char sg_erase
Erase character
char sg_kill
Kill character
int sg_flags
Various flags

— Function: int gtty (int filedes, struct sgttyb *attributes)

Preliminary: | MT-Safe | AS-Safe | AC-Safe | See POSIX Safety Concepts.

This function gets the attributes of a terminal.

gtty sets *attributes to describe the terminal attributes of the terminal which is open with file descriptor filedes.

— Function: int stty (int filedes, const struct sgttyb *attributes)

Preliminary: | MT-Safe | AS-Safe | AC-Safe | See POSIX Safety Concepts.

This function sets the attributes of a terminal.

stty sets the terminal attributes of the terminal which is open with file descriptor filedes to those described by *filedes.