# TTY_BLOCK_START

- **Language:** C
- **Kind:** constant
- **Source:** https://github.com/tmux/tmux/blob/e476c1230b958df0cb12977517d24b3dc931375b/tty.c#L81
- **Page:** https://libtmux.org/en/tmux/latest/reference/c-define-tty-c-tty_block_start/

```c
#define TTY_BLOCK_START(tty) (1 + ((tty)->sx * (tty)->sy) * 8)
```

## Referenced by

- [`tty_block_maybe`](/en/tmux/latest/reference/c-function-tty-c-tty_block_maybe/) (function)

## Referenced declarations

- [`tty`](/en/tmux/latest/reference/c-struct-tty/) (struct)