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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.
This structure is an input or output parameter list for
gttyandstty.
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