tty.h revision 33f0f88f1c51ae5c2d593d26960c760ea154c2e2
1#ifndef _LINUX_TTY_H 2#define _LINUX_TTY_H 3 4/* 5 * 'tty.h' defines some structures used by tty_io.c and some defines. 6 */ 7 8/* 9 * These constants are also useful for user-level apps (e.g., VC 10 * resizing). 11 */ 12#define MIN_NR_CONSOLES 1 /* must be at least 1 */ 13#define MAX_NR_CONSOLES 63 /* serial lines start at 64 */ 14#define MAX_NR_USER_CONSOLES 63 /* must be root to allocate above this */ 15 /* Note: the ioctl VT_GETSTATE does not work for 16 consoles 16 and higher (since it returns a short) */ 17 18#ifdef __KERNEL__ 19#include <linux/config.h> 20#include <linux/fs.h> 21#include <linux/major.h> 22#include <linux/termios.h> 23#include <linux/workqueue.h> 24#include <linux/tty_driver.h> 25#include <linux/tty_ldisc.h> 26#include <linux/screen_info.h> 27 28#include <asm/system.h> 29 30 31/* 32 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are 33 * hardcoded at present.) 34 */ 35#define NR_PTYS CONFIG_LEGACY_PTY_COUNT /* Number of legacy ptys */ 36#define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ 37#define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ 38#define NR_LDISCS 16 39 40/* 41 * This character is the same as _POSIX_VDISABLE: it cannot be used as 42 * a c_cc[] character, but indicates that a particular special character 43 * isn't in use (eg VINTR has no character etc) 44 */ 45#define __DISABLED_CHAR '\0' 46 47/* 48 * This is the flip buffer used for the tty driver. The buffer is 49 * located in the tty structure, and is used as a high speed interface 50 * between the tty driver and the tty line discipline. 51 */ 52#define TTY_FLIPBUF_SIZE 512 53 54struct tty_buffer { 55 struct tty_buffer *next; 56 char *char_buf_ptr; 57 unsigned char *flag_buf_ptr; 58 int used; 59 int size; 60 /* Data points here */ 61 unsigned long data[0]; 62}; 63 64struct tty_bufhead { 65 struct work_struct work; 66 struct semaphore pty_sem; 67 struct tty_buffer *head; /* Queue head */ 68 struct tty_buffer *tail; /* Active buffer */ 69 struct tty_buffer *free; /* Free queue head */ 70}; 71/* 72 * The pty uses char_buf and flag_buf as a contiguous buffer 73 */ 74#define PTY_BUF_SIZE 4*TTY_FLIPBUF_SIZE 75 76/* 77 * When a break, frame error, or parity error happens, these codes are 78 * stuffed into the flags buffer. 79 */ 80#define TTY_NORMAL 0 81#define TTY_BREAK 1 82#define TTY_FRAME 2 83#define TTY_PARITY 3 84#define TTY_OVERRUN 4 85 86#define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR]) 87#define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT]) 88#define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE]) 89#define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL]) 90#define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF]) 91#define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME]) 92#define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN]) 93#define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC]) 94#define START_CHAR(tty) ((tty)->termios->c_cc[VSTART]) 95#define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP]) 96#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP]) 97#define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL]) 98#define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT]) 99#define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD]) 100#define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE]) 101#define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT]) 102#define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2]) 103 104#define _I_FLAG(tty,f) ((tty)->termios->c_iflag & (f)) 105#define _O_FLAG(tty,f) ((tty)->termios->c_oflag & (f)) 106#define _C_FLAG(tty,f) ((tty)->termios->c_cflag & (f)) 107#define _L_FLAG(tty,f) ((tty)->termios->c_lflag & (f)) 108 109#define I_IGNBRK(tty) _I_FLAG((tty),IGNBRK) 110#define I_BRKINT(tty) _I_FLAG((tty),BRKINT) 111#define I_IGNPAR(tty) _I_FLAG((tty),IGNPAR) 112#define I_PARMRK(tty) _I_FLAG((tty),PARMRK) 113#define I_INPCK(tty) _I_FLAG((tty),INPCK) 114#define I_ISTRIP(tty) _I_FLAG((tty),ISTRIP) 115#define I_INLCR(tty) _I_FLAG((tty),INLCR) 116#define I_IGNCR(tty) _I_FLAG((tty),IGNCR) 117#define I_ICRNL(tty) _I_FLAG((tty),ICRNL) 118#define I_IUCLC(tty) _I_FLAG((tty),IUCLC) 119#define I_IXON(tty) _I_FLAG((tty),IXON) 120#define I_IXANY(tty) _I_FLAG((tty),IXANY) 121#define I_IXOFF(tty) _I_FLAG((tty),IXOFF) 122#define I_IMAXBEL(tty) _I_FLAG((tty),IMAXBEL) 123#define I_IUTF8(tty) _I_FLAG((tty),IUTF8) 124 125#define O_OPOST(tty) _O_FLAG((tty),OPOST) 126#define O_OLCUC(tty) _O_FLAG((tty),OLCUC) 127#define O_ONLCR(tty) _O_FLAG((tty),ONLCR) 128#define O_OCRNL(tty) _O_FLAG((tty),OCRNL) 129#define O_ONOCR(tty) _O_FLAG((tty),ONOCR) 130#define O_ONLRET(tty) _O_FLAG((tty),ONLRET) 131#define O_OFILL(tty) _O_FLAG((tty),OFILL) 132#define O_OFDEL(tty) _O_FLAG((tty),OFDEL) 133#define O_NLDLY(tty) _O_FLAG((tty),NLDLY) 134#define O_CRDLY(tty) _O_FLAG((tty),CRDLY) 135#define O_TABDLY(tty) _O_FLAG((tty),TABDLY) 136#define O_BSDLY(tty) _O_FLAG((tty),BSDLY) 137#define O_VTDLY(tty) _O_FLAG((tty),VTDLY) 138#define O_FFDLY(tty) _O_FLAG((tty),FFDLY) 139 140#define C_BAUD(tty) _C_FLAG((tty),CBAUD) 141#define C_CSIZE(tty) _C_FLAG((tty),CSIZE) 142#define C_CSTOPB(tty) _C_FLAG((tty),CSTOPB) 143#define C_CREAD(tty) _C_FLAG((tty),CREAD) 144#define C_PARENB(tty) _C_FLAG((tty),PARENB) 145#define C_PARODD(tty) _C_FLAG((tty),PARODD) 146#define C_HUPCL(tty) _C_FLAG((tty),HUPCL) 147#define C_CLOCAL(tty) _C_FLAG((tty),CLOCAL) 148#define C_CIBAUD(tty) _C_FLAG((tty),CIBAUD) 149#define C_CRTSCTS(tty) _C_FLAG((tty),CRTSCTS) 150 151#define L_ISIG(tty) _L_FLAG((tty),ISIG) 152#define L_ICANON(tty) _L_FLAG((tty),ICANON) 153#define L_XCASE(tty) _L_FLAG((tty),XCASE) 154#define L_ECHO(tty) _L_FLAG((tty),ECHO) 155#define L_ECHOE(tty) _L_FLAG((tty),ECHOE) 156#define L_ECHOK(tty) _L_FLAG((tty),ECHOK) 157#define L_ECHONL(tty) _L_FLAG((tty),ECHONL) 158#define L_NOFLSH(tty) _L_FLAG((tty),NOFLSH) 159#define L_TOSTOP(tty) _L_FLAG((tty),TOSTOP) 160#define L_ECHOCTL(tty) _L_FLAG((tty),ECHOCTL) 161#define L_ECHOPRT(tty) _L_FLAG((tty),ECHOPRT) 162#define L_ECHOKE(tty) _L_FLAG((tty),ECHOKE) 163#define L_FLUSHO(tty) _L_FLAG((tty),FLUSHO) 164#define L_PENDIN(tty) _L_FLAG((tty),PENDIN) 165#define L_IEXTEN(tty) _L_FLAG((tty),IEXTEN) 166 167struct device; 168/* 169 * Where all of the state associated with a tty is kept while the tty 170 * is open. Since the termios state should be kept even if the tty 171 * has been closed --- for things like the baud rate, etc --- it is 172 * not stored here, but rather a pointer to the real state is stored 173 * here. Possible the winsize structure should have the same 174 * treatment, but (1) the default 80x24 is usually right and (2) it's 175 * most often used by a windowing system, which will set the correct 176 * size each time the window is created or resized anyway. 177 * - TYT, 9/14/92 178 */ 179struct tty_struct { 180 int magic; 181 struct tty_driver *driver; 182 int index; 183 struct tty_ldisc ldisc; 184 struct semaphore termios_sem; 185 struct termios *termios, *termios_locked; 186 char name[64]; 187 int pgrp; 188 int session; 189 unsigned long flags; 190 int count; 191 struct winsize winsize; 192 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1; 193 unsigned char low_latency:1, warned:1; 194 unsigned char ctrl_status; 195 unsigned int receive_room; /* Bytes free for queue */ 196 197 struct tty_struct *link; 198 struct fasync_struct *fasync; 199 struct tty_bufhead buf; 200 int max_flip_cnt; 201 int alt_speed; /* For magic substitution of 38400 bps */ 202 wait_queue_head_t write_wait; 203 wait_queue_head_t read_wait; 204 struct work_struct hangup_work; 205 void *disc_data; 206 void *driver_data; 207 struct list_head tty_files; 208 209#define N_TTY_BUF_SIZE 4096 210 211 /* 212 * The following is data for the N_TTY line discipline. For 213 * historical reasons, this is included in the tty structure. 214 */ 215 unsigned int column; 216 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1; 217 unsigned char closing:1; 218 unsigned short minimum_to_wake; 219 unsigned long overrun_time; 220 int num_overrun; 221 unsigned long process_char_map[256/(8*sizeof(unsigned long))]; 222 char *read_buf; 223 int read_head; 224 int read_tail; 225 int read_cnt; 226 unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))]; 227 int canon_data; 228 unsigned long canon_head; 229 unsigned int canon_column; 230 struct semaphore atomic_read; 231 struct semaphore atomic_write; 232 unsigned char *write_buf; 233 int write_cnt; 234 spinlock_t read_lock; 235 /* If the tty has a pending do_SAK, queue it here - akpm */ 236 struct work_struct SAK_work; 237}; 238 239/* tty magic number */ 240#define TTY_MAGIC 0x5401 241 242/* 243 * These bits are used in the flags field of the tty structure. 244 * 245 * So that interrupts won't be able to mess up the queues, 246 * copy_to_cooked must be atomic with respect to itself, as must 247 * tty->write. Thus, you must use the inline functions set_bit() and 248 * clear_bit() to make things atomic. 249 */ 250#define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ 251#define TTY_IO_ERROR 1 /* Canse an I/O error (may be no ldisc too) */ 252#define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ 253#define TTY_EXCLUSIVE 3 /* Exclusive open mode */ 254#define TTY_DEBUG 4 /* Debugging */ 255#define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ 256#define TTY_PUSH 6 /* n_tty private */ 257#define TTY_CLOSING 7 /* ->close() in progress */ 258#define TTY_DONT_FLIP 8 /* Defer buffer flip */ 259#define TTY_LDISC 9 /* Line discipline attached */ 260#define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */ 261#define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */ 262#define TTY_PTY_LOCK 16 /* pty private */ 263#define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ 264#define TTY_HUPPED 18 /* Post driver->hangup() */ 265 266#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty)) 267 268extern void tty_write_flush(struct tty_struct *); 269 270extern struct termios tty_std_termios; 271extern int fg_console, last_console, want_console; 272 273extern int kmsg_redirect; 274 275extern void console_init(void); 276extern int vcs_init(void); 277 278extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, 279 const char *routine); 280extern char *tty_name(struct tty_struct *tty, char *buf); 281extern void tty_wait_until_sent(struct tty_struct * tty, long timeout); 282extern int tty_check_change(struct tty_struct * tty); 283extern void stop_tty(struct tty_struct * tty); 284extern void start_tty(struct tty_struct * tty); 285extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc); 286extern int tty_unregister_ldisc(int disc); 287extern int tty_register_driver(struct tty_driver *driver); 288extern int tty_unregister_driver(struct tty_driver *driver); 289extern void tty_register_device(struct tty_driver *driver, unsigned index, struct device *dev); 290extern void tty_unregister_device(struct tty_driver *driver, unsigned index); 291extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp, 292 int buflen); 293extern void tty_write_message(struct tty_struct *tty, char *msg); 294 295extern int is_orphaned_pgrp(int pgrp); 296extern int is_ignored(int sig); 297extern int tty_signal(int sig, struct tty_struct *tty); 298extern void tty_hangup(struct tty_struct * tty); 299extern void tty_vhangup(struct tty_struct * tty); 300extern void tty_unhangup(struct file *filp); 301extern int tty_hung_up_p(struct file * filp); 302extern void do_SAK(struct tty_struct *tty); 303extern void disassociate_ctty(int priv); 304extern void tty_flip_buffer_push(struct tty_struct *tty); 305extern int tty_get_baud_rate(struct tty_struct *tty); 306extern int tty_termios_baud_rate(struct termios *termios); 307 308extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); 309extern void tty_ldisc_deref(struct tty_ldisc *); 310extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); 311 312extern struct tty_ldisc *tty_ldisc_get(int); 313extern void tty_ldisc_put(int); 314 315extern void tty_wakeup(struct tty_struct *tty); 316extern void tty_ldisc_flush(struct tty_struct *tty); 317 318struct semaphore; 319extern struct semaphore tty_sem; 320 321/* n_tty.c */ 322extern struct tty_ldisc tty_ldisc_N_TTY; 323 324/* tty_ioctl.c */ 325extern int n_tty_ioctl(struct tty_struct * tty, struct file * file, 326 unsigned int cmd, unsigned long arg); 327 328/* serial.c */ 329 330extern void serial_console_init(void); 331 332/* pcxx.c */ 333 334extern int pcxe_open(struct tty_struct *tty, struct file *filp); 335 336/* printk.c */ 337 338extern void console_print(const char *); 339 340/* vt.c */ 341 342extern int vt_ioctl(struct tty_struct *tty, struct file * file, 343 unsigned int cmd, unsigned long arg); 344 345static inline dev_t tty_devnum(struct tty_struct *tty) 346{ 347 return MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index; 348} 349 350#endif /* __KERNEL__ */ 351#endif 352