Import of Linus's Linux 1.1.68

1 files changed, 334 insertions, 0 deletions

diff --git a/include/linux/tty.h b/include/linux/tty.h
new file mode 100644
index 000000000..c177902b5
--- /dev/null
+++ b/include/linux/tty.h
@@ -0,0 +1,334 @@
+#ifndef _LINUX_TTY_H
+#define _LINUX_TTY_H
+
+/*
+ * 'tty.h' defines some structures used by tty_io.c and some defines.
+ */
+
+#ifdef __KERNEL__
+#include <linux/fs.h>
+#include <linux/termios.h>
+#include <linux/tqueue.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_ldisc.h>
+
+#include <asm/system.h>
+
+
+/*
+ * Note: don't mess with NR_PTYS until you understand the tty minor 
+ * number allocation game...
+ * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
+ * hardcoded at present.)
+ */
+#define MIN_NR_CONSOLES	1	/* must be at least 1 */
+#define MAX_NR_CONSOLES	63	/* serial lines start at 64 */
+#define MAX_NR_USER_CONSOLES 63	/* must be root to allocate above this */
+		/* Note: the ioctl VT_GETSTATE does not work for
+		   consoles 16 and higher (since it returns a short) */
+#define NR_PTYS		64
+#define NR_LDISCS	16
+
+/*
+ * These are set up by the setup-routine at boot-time:
+ */
+
+struct screen_info {
+	unsigned char  orig_x;
+	unsigned char  orig_y;
+	unsigned char  unused1[2];
+	unsigned short orig_video_page;
+	unsigned char  orig_video_mode;
+	unsigned char  orig_video_cols;
+	unsigned short orig_video_ega_ax;
+	unsigned short orig_video_ega_bx;
+	unsigned short orig_video_ega_cx;
+	unsigned char  orig_video_lines;
+};
+
+extern struct screen_info screen_info;
+
+#define ORIG_X			(screen_info.orig_x)
+#define ORIG_Y			(screen_info.orig_y)
+#define ORIG_VIDEO_PAGE		(screen_info.orig_video_page)
+#define ORIG_VIDEO_MODE		(screen_info.orig_video_mode)
+#define ORIG_VIDEO_COLS 	(screen_info.orig_video_cols)
+#define ORIG_VIDEO_EGA_AX	(screen_info.orig_video_ega_ax)
+#define ORIG_VIDEO_EGA_BX	(screen_info.orig_video_ega_bx)
+#define ORIG_VIDEO_EGA_CX	(screen_info.orig_video_ega_cx)
+#define ORIG_VIDEO_LINES	(screen_info.orig_video_lines)
+
+#define VIDEO_TYPE_MDA		0x10	/* Monochrome Text Display	*/
+#define VIDEO_TYPE_CGA		0x11	/* CGA Display 			*/
+#define VIDEO_TYPE_EGAM		0x20	/* EGA/VGA in Monochrome Mode	*/
+#define VIDEO_TYPE_EGAC		0x21	/* EGA/VGA in Color Mode	*/
+
+/*
+ * This character is the same as _POSIX_VDISABLE: it cannot be used as
+ * a c_cc[] character, but indicates that a particular special character
+ * isn't in use (eg VINTR has no character etc)
+ */
+#define __DISABLED_CHAR '\0'
+
+/*
+ * This is the flip buffer used for the tty driver.  The buffer is
+ * located in the tty structure, and is used as a high speed interface
+ * between the tty driver and the tty line discipline.
+ */
+#define TTY_FLIPBUF_SIZE 512
+
+struct tty_flip_buffer {
+	struct tq_struct tqueue;
+	unsigned char	char_buf[2*TTY_FLIPBUF_SIZE];
+	char		flag_buf[2*TTY_FLIPBUF_SIZE];
+	char		*char_buf_ptr;
+	unsigned char	*flag_buf_ptr;
+	int		count;
+	int		buf_num;
+};
+
+/*
+ * When a break, frame error, or parity error happens, these codes are
+ * stuffed into the flags buffer.
+ */
+#define TTY_NORMAL	0
+#define TTY_BREAK	1
+#define TTY_FRAME	2
+#define TTY_PARITY	3
+#define TTY_OVERRUN	4
+
+#define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
+#define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
+#define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
+#define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
+#define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
+#define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
+#define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
+#define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
+#define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
+#define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
+#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
+#define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
+#define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
+#define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
+#define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
+#define LNEXT_CHAR(tty)	((tty)->termios->c_cc[VLNEXT])
+#define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
+
+#define _I_FLAG(tty,f)	((tty)->termios->c_iflag & (f))
+#define _O_FLAG(tty,f)	((tty)->termios->c_oflag & (f))
+#define _C_FLAG(tty,f)	((tty)->termios->c_cflag & (f))
+#define _L_FLAG(tty,f)	((tty)->termios->c_lflag & (f))
+
+#define I_IGNBRK(tty)	_I_FLAG((tty),IGNBRK)
+#define I_BRKINT(tty)	_I_FLAG((tty),BRKINT)
+#define I_IGNPAR(tty)	_I_FLAG((tty),IGNPAR)
+#define I_PARMRK(tty)	_I_FLAG((tty),PARMRK)
+#define I_INPCK(tty)	_I_FLAG((tty),INPCK)
+#define I_ISTRIP(tty)	_I_FLAG((tty),ISTRIP)
+#define I_INLCR(tty)	_I_FLAG((tty),INLCR)
+#define I_IGNCR(tty)	_I_FLAG((tty),IGNCR)
+#define I_ICRNL(tty)	_I_FLAG((tty),ICRNL)
+#define I_IUCLC(tty)	_I_FLAG((tty),IUCLC)
+#define I_IXON(tty)	_I_FLAG((tty),IXON)
+#define I_IXANY(tty)	_I_FLAG((tty),IXANY)
+#define I_IXOFF(tty)	_I_FLAG((tty),IXOFF)
+#define I_IMAXBEL(tty)	_I_FLAG((tty),IMAXBEL)
+
+#define O_OPOST(tty)	_O_FLAG((tty),OPOST)
+#define O_OLCUC(tty)	_O_FLAG((tty),OLCUC)
+#define O_ONLCR(tty)	_O_FLAG((tty),ONLCR)
+#define O_OCRNL(tty)	_O_FLAG((tty),OCRNL)
+#define O_ONOCR(tty)	_O_FLAG((tty),ONOCR)
+#define O_ONLRET(tty)	_O_FLAG((tty),ONLRET)
+#define O_OFILL(tty)	_O_FLAG((tty),OFILL)
+#define O_OFDEL(tty)	_O_FLAG((tty),OFDEL)
+#define O_NLDLY(tty)	_O_FLAG((tty),NLDLY)
+#define O_CRDLY(tty)	_O_FLAG((tty),CRDLY)
+#define O_TABDLY(tty)	_O_FLAG((tty),TABDLY)
+#define O_BSDLY(tty)	_O_FLAG((tty),BSDLY)
+#define O_VTDLY(tty)	_O_FLAG((tty),VTDLY)
+#define O_FFDLY(tty)	_O_FLAG((tty),FFDLY)
+
+#define C_BAUD(tty)	_C_FLAG((tty),CBAUD)
+#define C_CSIZE(tty)	_C_FLAG((tty),CSIZE)
+#define C_CSTOPB(tty)	_C_FLAG((tty),CSTOPB)
+#define C_CREAD(tty)	_C_FLAG((tty),CREAD)
+#define C_PARENB(tty)	_C_FLAG((tty),PARENB)
+#define C_PARODD(tty)	_C_FLAG((tty),PARODD)
+#define C_HUPCL(tty)	_C_FLAG((tty),HUPCL)
+#define C_CLOCAL(tty)	_C_FLAG((tty),CLOCAL)
+#define C_CIBAUD(tty)	_C_FLAG((tty),CIBAUD)
+#define C_CRTSCTS(tty)	_C_FLAG((tty),CRTSCTS)
+
+#define L_ISIG(tty)	_L_FLAG((tty),ISIG)
+#define L_ICANON(tty)	_L_FLAG((tty),ICANON)
+#define L_XCASE(tty)	_L_FLAG((tty),XCASE)
+#define L_ECHO(tty)	_L_FLAG((tty),ECHO)
+#define L_ECHOE(tty)	_L_FLAG((tty),ECHOE)
+#define L_ECHOK(tty)	_L_FLAG((tty),ECHOK)
+#define L_ECHONL(tty)	_L_FLAG((tty),ECHONL)
+#define L_NOFLSH(tty)	_L_FLAG((tty),NOFLSH)
+#define L_TOSTOP(tty)	_L_FLAG((tty),TOSTOP)
+#define L_ECHOCTL(tty)	_L_FLAG((tty),ECHOCTL)
+#define L_ECHOPRT(tty)	_L_FLAG((tty),ECHOPRT)
+#define L_ECHOKE(tty)	_L_FLAG((tty),ECHOKE)
+#define L_FLUSHO(tty)	_L_FLAG((tty),FLUSHO)
+#define L_PENDIN(tty)	_L_FLAG((tty),PENDIN)
+#define L_IEXTEN(tty)	_L_FLAG((tty),IEXTEN)
+
+/*
+ * Where all of the state associated with a tty is kept while the tty
+ * is open.  Since the termios state should be kept even if the tty
+ * has been closed --- for things like the baud rate, etc --- it is
+ * not stored here, but rather a pointer to the real state is stored
+ * here.  Possible the winsize structure should have the same
+ * treatment, but (1) the default 80x24 is usually right and (2) it's
+ * most often used by a windowing system, which will set the correct
+ * size each time the window is created or resized anyway.
+ * IMPORTANT: since this structure is dynamically allocated, it must
+ * be no larger than 4096 bytes.  Changing TTY_BUF_SIZE will change
+ * the size of this structure, and it needs to be done with care.
+ * 						- TYT, 9/14/92
+ */
+struct tty_struct {
+	int	magic;
+	struct tty_driver driver;
+	struct tty_ldisc ldisc;
+	struct termios *termios, *termios_locked;
+	int pgrp;
+	int session;
+	dev_t	device;
+	int flags;
+	int count;
+	struct winsize winsize;
+	unsigned char stopped:1, hw_stopped:1, packet:1;
+	unsigned char ctrl_status;
+
+	struct tty_struct *link;
+	struct fasync_struct *fasync;
+	struct tty_flip_buffer flip;
+	int max_flip_cnt;
+	struct wait_queue *write_wait;
+	struct wait_queue *read_wait;
+	void *disc_data;
+	void *driver_data;
+
+#define N_TTY_BUF_SIZE 4096
+	
+	/*
+	 * The following is data for the N_TTY line discipline.  For
+	 * historical reasons, this is included in the tty structure.
+	 */
+	unsigned int column;
+	unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
+	unsigned short minimum_to_wake;
+	unsigned overrun_time;
+	int num_overrun;
+	int process_char_map[256/32];
+	char *read_buf;
+	int read_head;
+	int read_tail;
+	int read_cnt;
+	int read_flags[N_TTY_BUF_SIZE/32];
+	int canon_data;
+	unsigned long canon_head;
+	unsigned int canon_column;
+};
+
+/* tty magic number */
+#define TTY_MAGIC		0x5401
+
+/*
+ * These bits are used in the flags field of the tty structure.
+ * 
+ * So that interrupts won't be able to mess up the queues,
+ * copy_to_cooked must be atomic with respect to itself, as must
+ * tty->write.  Thus, you must use the inline functions set_bit() and
+ * clear_bit() to make things atomic.
+ */
+#define TTY_THROTTLED 0
+#define TTY_IO_ERROR 1
+#define TTY_SLAVE_CLOSED 2
+#define TTY_EXCLUSIVE 3
+#define TTY_DEBUG 4
+#define TTY_DO_WRITE_WAKEUP 5
+#define TTY_PUSH 6
+
+#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
+
+extern void tty_write_flush(struct tty_struct *);
+
+extern struct termios tty_std_termios;
+extern struct tty_struct * redirect;
+extern struct tty_ldisc ldiscs[];
+extern int fg_console;
+extern struct wait_queue * keypress_wait;
+
+/*	intr=^C		quit=^|		erase=del	kill=^U
+	eof=^D		vtime=\0	vmin=\1		sxtc=\0
+	start=^Q	stop=^S		susp=^Z		eol=\0
+	reprint=^R	discard=^U	werase=^W	lnext=^V
+	eol2=\0
+*/
+#define INIT_C_CC "\003\034\177\025\004\0\1\0\021\023\032\0\022\017\027\026\0"
+
+extern long rs_init(long);
+extern long lp_init(long);
+extern long con_init(long);
+extern long pty_init(long);
+extern long tty_init(long);
+
+extern int tty_paranoia_check(struct tty_struct *tty, dev_t device,
+			      const char *routine);
+extern char *_tty_name(struct tty_struct *tty, char *buf);
+extern char *tty_name(struct tty_struct *tty);
+extern void wait_until_sent(struct tty_struct * tty, int timeout);
+extern int tty_check_change(struct tty_struct * tty);
+extern void stop_tty(struct tty_struct * tty);
+extern void start_tty(struct tty_struct * tty);
+extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc);
+extern int tty_register_driver(struct tty_driver *driver);
+extern int tty_unregister_driver(struct tty_driver *driver);
+extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
+			     int buflen);
+
+extern int is_orphaned_pgrp(int pgrp);
+extern int is_ignored(int sig);
+extern int tty_signal(int sig, struct tty_struct *tty);
+extern void tty_hangup(struct tty_struct * tty);
+extern void tty_vhangup(struct tty_struct * tty);
+extern void tty_unhangup(struct file *filp);
+extern int tty_hung_up_p(struct file * filp);
+extern void do_SAK(struct tty_struct *tty);
+extern void disassociate_ctty(int priv);
+
+/* n_tty.c */
+extern struct tty_ldisc tty_ldisc_N_TTY;
+
+/* tty_ioctl.c */
+extern int n_tty_ioctl(struct tty_struct * tty, struct file * file,
+		       unsigned int cmd, unsigned long arg);
+
+/* serial.c */
+
+extern int  rs_open(struct tty_struct * tty, struct file * filp);
+
+/* pty.c */
+
+extern int  pty_open(struct tty_struct * tty, struct file * filp);
+
+/* console.c */
+
+extern int con_open(struct tty_struct * tty, struct file * filp);
+extern void update_screen(int new_console);
+extern void blank_screen(void);
+extern void unblank_screen(void);
+
+/* vt.c */
+
+extern int vt_ioctl(struct tty_struct *tty, struct file * file,
+		    unsigned int cmd, unsigned long arg);
+
+#endif /* __KERNEL__ */
+#endif