tty.c File Reference

#include <miniOS/drivers/tty.h>
#include <miniOS/arch/x86_64/spinlock.h>
#include <miniOS/drivers/vt.h>
#include <miniOS/mm/vmm.h>
#include <miniOS/sched/sched.h>
#include <string.h>

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Classes
struct	tty_state_t

Macros
#define	USER_PTR_VALID(p)
#define	SIGINT   2
#define	TTY_BUFFER_SIZE   256

Functions
static uint16_t	tty_ring_count (void)
static void	tty_ring_push (char c)
static int	tty_ring_pop (char *out)
static void	tty_echo_byte (char c)
static void	tty_flush_pending_input_locked (void)
static void	tty_finalize_canonical_line_locked (void)
static void	tty_deliver_sigint_locked (void)
static void	tty_apply_defaults_locked (void)
static void	tty_apply_termios_locked (const struct minios_termios *termios, int flush_input)
void	tty_init (void)
	Sets up the canonical input ring buffer, initialises the default termios (c_lflag = ICANON|ECHO|ISIG, VINTR=^C, VEOF=^D), and sets the window size to SCREEN_ROWS x SCREEN_COLS. Must be called once during kernel boot before tty_keyboard_input() or tty_read() are used.
int	tty_has_data (void)
void	tty_inject_escape (const char *seq, int len)
void	tty_keyboard_input (char c)
	In canonical mode (ICANON set): appends to the line buffer; on newline or VEOF flushes the complete line to the read buffer. In raw mode: writes directly to the read buffer. Echoes to vt_write_byte() if ECHO is set. Sends SIGINT to the foreground process group if ISIG is set and == VINTR. Called from the keyboard interrupt handler (IRQ1).
int	tty_read (void *buf, uint32_t len, int nonblock)
	In canonical mode: blocks (or returns -EAGAIN if nonblock) until a complete line is available, then copies up to @len bytes. In raw mode: returns as many bytes as are immediately available up to @len.
int	tty_write (const void *buf, uint32_t len)
	Forwards each byte to vt_write_byte(), which handles ANSI/VT escape sequence parsing and VGA cell rendering.
int	tty_ioctl (uint64_t cmd, uint64_t arg)
	TCGETS: copies current termios to *arg. TCSETS/TCSETSW: copies termios from *arg into the kernel TTY state. TIOCGWINSZ: copies the window size (SCREEN_ROWS x SCREEN_COLS) to *arg. TIOCSCTTY/TIOCNOTTY: accepted (no-op in single-TTY kernel).
int	tty_isatty_fd (int fd)
	Returns 1 if the fd's vfs_file entry has ftype == VFS_FILE_TYPE_CHAR and device_type == VFS_DEVICE_TTY, 0 otherwise. Used by the isatty(3) Newlib stub.

Variables
static tty_state_t	tty_state

Macro Definition Documentation

SIGINT

#define SIGINT   2

TTY_BUFFER_SIZE

#define TTY_BUFFER_SIZE   256

USER_PTR_VALID

#define USER_PTR_VALID

(

p

)

Value:

((uint64_t)(uintptr_t)(p) < KERNEL_VMA)

Function Documentation

tty_apply_defaults_locked()

void tty_apply_defaults_locked ( void )

static

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tty_apply_termios_locked()

void tty_apply_termios_locked ( const struct minios_termios * termios, int flush_input )

static

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tty_deliver_sigint_locked()

void tty_deliver_sigint_locked ( void )

static

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tty_echo_byte()

void tty_echo_byte ( char c )

static

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tty_finalize_canonical_line_locked()

void tty_finalize_canonical_line_locked ( void )

static

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tty_flush_pending_input_locked()

void tty_flush_pending_input_locked ( void )

static

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tty_ring_count()

uint16_t tty_ring_count ( void )

static

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tty_ring_pop()

int tty_ring_pop ( char * out )

static

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tty_ring_push()

void tty_ring_push ( char c )

static

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Variable Documentation

tty_state

tty_state_t tty_state

static

Initial value:

                             = {
    .lock = SPINLOCK_INIT,
}