include/linux/tty.h

   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 #ifdef __KERNEL__
   9 #include <linux/fs.h>
  10 #include <linux/major.h>
  11 #include <linux/termios.h>
  12 #include <linux/workqueue.h>
  13 #include <linux/tty_driver.h>
  14 #include <linux/tty_ldisc.h>
  15 #include <linux/mutex.h>
  16
  17 #include <asm/system.h>
  18
  19
  20 /*
  21  * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
  22  * hardcoded at present.)
  23  */
  24 #define NR_UNIX98_PTY_DEFAULT   4096      /* Default maximum for Unix98 ptys */
  25 #define NR_UNIX98_PTY_MAX       (1 << MINORBITS) /* Absolute limit */
  26 #define NR_LDISCS               20
  27
  28 /* line disciplines */
  29 #define N_TTY           0
  30 #define N_SLIP          1
  31 #define N_MOUSE         2
  32 #define N_PPP           3
  33 #define N_STRIP         4
  34 #define N_AX25          5
  35 #define N_X25           6       /* X.25 async */
  36 #define N_6PACK         7
  37 #define N_MASC          8       /* Reserved for Mobitex module <kaz@cafe.net> */
  38 #define N_R3964         9       /* Reserved for Simatic R3964 module */
  39 #define N_PROFIBUS_FDL  10      /* Reserved for Profibus */
  40 #define N_IRDA          11      /* Linux IrDa - http://irda.sourceforge.net/ */
  41 #define N_SMSBLOCK      12      /* SMS block mode - for talking to GSM data */
  42                                 /* cards about SMS messages */
  43 #define N_HDLC          13      /* synchronous HDLC */
  44 #define N_SYNC_PPP      14      /* synchronous PPP */
  45 #define N_HCI           15      /* Bluetooth HCI UART */
  46 #define N_GIGASET_M101  16      /* Siemens Gigaset M101 serial DECT adapter */
  47 #define N_SLCAN         17      /* Serial / USB serial CAN Adaptors */
  48 #define N_PPS           18      /* Pulse per Second */
  49
  50 #define N_V253          19      /* Codec control over voice modem */
  51
  52 /*
  53  * This character is the same as _POSIX_VDISABLE: it cannot be used as
  54  * a c_cc[] character, but indicates that a particular special character
  55  * isn't in use (eg VINTR has no character etc)
  56  */
  57 #define __DISABLED_CHAR '\0'
  58
  59 struct tty_buffer {
  60         struct tty_buffer *next;
  61         char *char_buf_ptr;
  62         unsigned char *flag_buf_ptr;
  63         int used;
  64         int size;
  65         int commit;
  66         int read;
  67         /* Data points here */
  68         unsigned long data[0];
  69 };
  70
  71 struct tty_bufhead {
  72         struct delayed_work work;
  73         spinlock_t lock;
  74         struct tty_buffer *head;        /* Queue head */
  75         struct tty_buffer *tail;        /* Active buffer */
  76         struct tty_buffer *free;        /* Free queue head */
  77         int memory_used;                /* Buffer space used excluding
  78                                                                 free queue */
  79 };
  80 /*
  81  * When a break, frame error, or parity error happens, these codes are
  82  * stuffed into the flags buffer.
  83  */
  84 #define TTY_NORMAL      0
  85 #define TTY_BREAK       1
  86 #define TTY_FRAME       2
  87 #define TTY_PARITY      3
  88 #define TTY_OVERRUN     4
  89
  90 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
  91 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
  92 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
  93 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
  94 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
  95 #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
  96 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
  97 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
  98 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
  99 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
 100 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
 101 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
 102 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
 103 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
 104 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
 105 #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
 106 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
 107
 108 #define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f))
 109 #define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f))
 110 #define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f))
 111 #define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f))
 112
 113 #define I_IGNBRK(tty)   _I_FLAG((tty), IGNBRK)
 114 #define I_BRKINT(tty)   _I_FLAG((tty), BRKINT)
 115 #define I_IGNPAR(tty)   _I_FLAG((tty), IGNPAR)
 116 #define I_PARMRK(tty)   _I_FLAG((tty), PARMRK)
 117 #define I_INPCK(tty)    _I_FLAG((tty), INPCK)
 118 #define I_ISTRIP(tty)   _I_FLAG((tty), ISTRIP)
 119 #define I_INLCR(tty)    _I_FLAG((tty), INLCR)
 120 #define I_IGNCR(tty)    _I_FLAG((tty), IGNCR)
 121 #define I_ICRNL(tty)    _I_FLAG((tty), ICRNL)
 122 #define I_IUCLC(tty)    _I_FLAG((tty), IUCLC)
 123 #define I_IXON(tty)     _I_FLAG((tty), IXON)
 124 #define I_IXANY(tty)    _I_FLAG((tty), IXANY)
 125 #define I_IXOFF(tty)    _I_FLAG((tty), IXOFF)
 126 #define I_IMAXBEL(tty)  _I_FLAG((tty), IMAXBEL)
 127 #define I_IUTF8(tty)    _I_FLAG((tty), IUTF8)
 128
 129 #define O_OPOST(tty)    _O_FLAG((tty), OPOST)
 130 #define O_OLCUC(tty)    _O_FLAG((tty), OLCUC)
 131 #define O_ONLCR(tty)    _O_FLAG((tty), ONLCR)
 132 #define O_OCRNL(tty)    _O_FLAG((tty), OCRNL)
 133 #define O_ONOCR(tty)    _O_FLAG((tty), ONOCR)
 134 #define O_ONLRET(tty)   _O_FLAG((tty), ONLRET)
 135 #define O_OFILL(tty)    _O_FLAG((tty), OFILL)
 136 #define O_OFDEL(tty)    _O_FLAG((tty), OFDEL)
 137 #define O_NLDLY(tty)    _O_FLAG((tty), NLDLY)
 138 #define O_CRDLY(tty)    _O_FLAG((tty), CRDLY)
 139 #define O_TABDLY(tty)   _O_FLAG((tty), TABDLY)
 140 #define O_BSDLY(tty)    _O_FLAG((tty), BSDLY)
 141 #define O_VTDLY(tty)    _O_FLAG((tty), VTDLY)
 142 #define O_FFDLY(tty)    _O_FLAG((tty), FFDLY)
 143
 144 #define C_BAUD(tty)     _C_FLAG((tty), CBAUD)
 145 #define C_CSIZE(tty)    _C_FLAG((tty), CSIZE)
 146 #define C_CSTOPB(tty)   _C_FLAG((tty), CSTOPB)
 147 #define C_CREAD(tty)    _C_FLAG((tty), CREAD)
 148 #define C_PARENB(tty)   _C_FLAG((tty), PARENB)
 149 #define C_PARODD(tty)   _C_FLAG((tty), PARODD)
 150 #define C_HUPCL(tty)    _C_FLAG((tty), HUPCL)
 151 #define C_CLOCAL(tty)   _C_FLAG((tty), CLOCAL)
 152 #define C_CIBAUD(tty)   _C_FLAG((tty), CIBAUD)
 153 #define C_CRTSCTS(tty)  _C_FLAG((tty), CRTSCTS)
 154
 155 #define L_ISIG(tty)     _L_FLAG((tty), ISIG)
 156 #define L_ICANON(tty)   _L_FLAG((tty), ICANON)
 157 #define L_XCASE(tty)    _L_FLAG((tty), XCASE)
 158 #define L_ECHO(tty)     _L_FLAG((tty), ECHO)
 159 #define L_ECHOE(tty)    _L_FLAG((tty), ECHOE)
 160 #define L_ECHOK(tty)    _L_FLAG((tty), ECHOK)
 161 #define L_ECHONL(tty)   _L_FLAG((tty), ECHONL)
 162 #define L_NOFLSH(tty)   _L_FLAG((tty), NOFLSH)
 163 #define L_TOSTOP(tty)   _L_FLAG((tty), TOSTOP)
 164 #define L_ECHOCTL(tty)  _L_FLAG((tty), ECHOCTL)
 165 #define L_ECHOPRT(tty)  _L_FLAG((tty), ECHOPRT)
 166 #define L_ECHOKE(tty)   _L_FLAG((tty), ECHOKE)
 167 #define L_FLUSHO(tty)   _L_FLAG((tty), FLUSHO)
 168 #define L_PENDIN(tty)   _L_FLAG((tty), PENDIN)
 169 #define L_IEXTEN(tty)   _L_FLAG((tty), IEXTEN)
 170
 171 struct device;
 172 struct signal_struct;
 173
 174 /*
 175  * Port level information. Each device keeps its own port level information
 176  * so provide a common structure for those ports wanting to use common support
 177  * routines.
 178  *
 179  * The tty port has a different lifetime to the tty so must be kept apart.
 180  * In addition be careful as tty -> port mappings are valid for the life
 181  * of the tty object but in many cases port -> tty mappings are valid only
 182  * until a hangup so don't use the wrong path.
 183  */
 184
 185 struct tty_port;
 186
 187 struct tty_port_operations {
 188         /* Return 1 if the carrier is raised */
 189         int (*carrier_raised)(struct tty_port *port);
 190         void (*dtr_rts)(struct tty_port *port, int raise);
 191 };
 192
 193 struct tty_port {
 194         struct tty_struct       *tty;           /* Back pointer */
 195         const struct tty_port_operations *ops;  /* Port operations */
 196         spinlock_t              lock;           /* Lock protecting tty field */
 197         int                     blocked_open;   /* Waiting to open */
 198         int                     count;          /* Usage count */
 199         wait_queue_head_t       open_wait;      /* Open waiters */
 200         wait_queue_head_t       close_wait;     /* Close waiters */
 201         unsigned long           flags;          /* TTY flags ASY_*/
 202         struct mutex            mutex;          /* Locking */
 203         unsigned char           *xmit_buf;      /* Optional buffer */
 204         int                     close_delay;    /* Close port delay */
 205         int                     closing_wait;   /* Delay for output */
 206         int                     drain_delay;    /* Set to zero if no pure time
 207                                                    based drain is needed else
 208                                                    set to size of fifo */
 209 };
 210
 211 /*
 212  * Where all of the state associated with a tty is kept while the tty
 213  * is open.  Since the termios state should be kept even if the tty
 214  * has been closed --- for things like the baud rate, etc --- it is
 215  * not stored here, but rather a pointer to the real state is stored
 216  * here.  Possible the winsize structure should have the same
 217  * treatment, but (1) the default 80x24 is usually right and (2) it's
 218  * most often used by a windowing system, which will set the correct
 219  * size each time the window is created or resized anyway.
 220  *                                              - TYT, 9/14/92
 221  */
 222
 223 struct tty_operations;
 224
 225 struct tty_struct {
 226         int     magic;
 227         struct kref kref;
 228         struct tty_driver *driver;
 229         const struct tty_operations *ops;
 230         int index;
 231
 232         /* Protects ldisc changes: Lock tty not pty */
 233         struct mutex ldisc_mutex;
 234         struct tty_ldisc *ldisc;
 235
 236         struct mutex termios_mutex;
 237         spinlock_t ctrl_lock;
 238         /* Termios values are protected by the termios mutex */
 239         struct ktermios *termios, *termios_locked;
 240         struct termiox *termiox;        /* May be NULL for unsupported */
 241         char name[64];
 242         struct pid *pgrp;               /* Protected by ctrl lock */
 243         struct pid *session;
 244         unsigned long flags;
 245         int count;
 246         struct winsize winsize;         /* termios mutex */
 247         unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
 248         unsigned char low_latency:1, warned:1;
 249         unsigned char ctrl_status;      /* ctrl_lock */
 250         unsigned int receive_room;      /* Bytes free for queue */
 251
 252         struct tty_struct *link;
 253         struct fasync_struct *fasync;
 254         struct tty_bufhead buf;         /* Locked internally */
 255         int alt_speed;          /* For magic substitution of 38400 bps */
 256         wait_queue_head_t write_wait;
 257         wait_queue_head_t read_wait;
 258         struct work_struct hangup_work;
 259         void *disc_data;
 260         void *driver_data;
 261         struct list_head tty_files;
 262
 263 #define N_TTY_BUF_SIZE 4096
 264
 265         /*
 266          * The following is data for the N_TTY line discipline.  For
 267          * historical reasons, this is included in the tty structure.
 268          * Mostly locked by the BKL.
 269          */
 270         unsigned int column;
 271         unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
 272         unsigned char closing:1;
 273         unsigned char echo_overrun:1;
 274         unsigned short minimum_to_wake;
 275         unsigned long overrun_time;
 276         int num_overrun;
 277         unsigned long process_char_map[256/(8*sizeof(unsigned long))];
 278         char *read_buf;
 279         int read_head;
 280         int read_tail;
 281         int read_cnt;
 282         unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
 283         unsigned char *echo_buf;
 284         unsigned int echo_pos;
 285         unsigned int echo_cnt;
 286         int canon_data;
 287         unsigned long canon_head;
 288         unsigned int canon_column;
 289         struct mutex atomic_read_lock;
 290         struct mutex atomic_write_lock;
 291         struct mutex output_lock;
 292         struct mutex echo_lock;
 293         unsigned char *write_buf;
 294         int write_cnt;
 295         spinlock_t read_lock;
 296         /* If the tty has a pending do_SAK, queue it here - akpm */
 297         struct work_struct SAK_work;
 298         struct tty_port *port;
 299 };
 300
 301 /* tty magic number */
 302 #define TTY_MAGIC               0x5401
 303
 304 /*
 305  * These bits are used in the flags field of the tty structure.
 306  *
 307  * So that interrupts won't be able to mess up the queues,
 308  * copy_to_cooked must be atomic with respect to itself, as must
 309  * tty->write.  Thus, you must use the inline functions set_bit() and
 310  * clear_bit() to make things atomic.
 311  */
 312 #define TTY_THROTTLED           0       /* Call unthrottle() at threshold min */
 313 #define TTY_IO_ERROR            1       /* Cause an I/O error (may be no ldisc too) */
 314 #define TTY_OTHER_CLOSED        2       /* Other side (if any) has closed */
 315 #define TTY_EXCLUSIVE           3       /* Exclusive open mode */
 316 #define TTY_DEBUG               4       /* Debugging */
 317 #define TTY_DO_WRITE_WAKEUP     5       /* Call write_wakeup after queuing new */
 318 #define TTY_PUSH                6       /* n_tty private */
 319 #define TTY_CLOSING             7       /* ->close() in progress */
 320 #define TTY_LDISC               9       /* Line discipline attached */
 321 #define TTY_LDISC_CHANGING      10      /* Line discipline changing */
 322 #define TTY_LDISC_OPEN          11      /* Line discipline is open */
 323 #define TTY_HW_COOK_OUT         14      /* Hardware can do output cooking */
 324 #define TTY_HW_COOK_IN          15      /* Hardware can do input cooking */
 325 #define TTY_PTY_LOCK            16      /* pty private */
 326 #define TTY_NO_WRITE_SPLIT      17      /* Preserve write boundaries to driver */
 327 #define TTY_HUPPED              18      /* Post driver->hangup() */
 328 #define TTY_FLUSHING            19      /* Flushing to ldisc in progress */
 329 #define TTY_FLUSHPENDING        20      /* Queued buffer flush pending */
 330
 331 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
 332
 333 extern void tty_write_flush(struct tty_struct *);
 334
 335 extern struct ktermios tty_std_termios;
 336
 337 extern int kmsg_redirect;
 338
 339 extern void console_init(void);
 340 extern int vcs_init(void);
 341
 342 extern struct class *tty_class;
 343
 344 /**
 345  *      tty_kref_get            -       get a tty reference
 346  *      @tty: tty device
 347  *
 348  *      Return a new reference to a tty object. The caller must hold
 349  *      sufficient locks/counts to ensure that their existing reference cannot
 350  *      go away
 351  */
 352
 353 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
 354 {
 355         if (tty)
 356                 kref_get(&tty->kref);
 357         return tty;
 358 }
 359 extern void tty_kref_put(struct tty_struct *tty);
 360
 361 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
 362                               const char *routine);
 363 extern char *tty_name(struct tty_struct *tty, char *buf);
 364 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
 365 extern int tty_check_change(struct tty_struct *tty);
 366 extern void stop_tty(struct tty_struct *tty);
 367 extern void start_tty(struct tty_struct *tty);
 368 extern int tty_register_driver(struct tty_driver *driver);
 369 extern int tty_unregister_driver(struct tty_driver *driver);
 370 extern struct device *tty_register_device(struct tty_driver *driver,
 371                                           unsigned index, struct device *dev);
 372 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
 373 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
 374                              int buflen);
 375 extern void tty_write_message(struct tty_struct *tty, char *msg);
 376 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
 377 extern int tty_chars_in_buffer(struct tty_struct *tty);
 378 extern int tty_write_room(struct tty_struct *tty);
 379 extern void tty_driver_flush_buffer(struct tty_struct *tty);
 380 extern void tty_throttle(struct tty_struct *tty);
 381 extern void tty_unthrottle(struct tty_struct *tty);
 382 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
 383 extern void tty_shutdown(struct tty_struct *tty);
 384 extern void tty_free_termios(struct tty_struct *tty);
 385 extern int is_current_pgrp_orphaned(void);
 386 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
 387 extern int is_ignored(int sig);
 388 extern int tty_signal(int sig, struct tty_struct *tty);
 389 extern void tty_hangup(struct tty_struct *tty);
 390 extern void tty_vhangup(struct tty_struct *tty);
 391 extern void tty_vhangup_self(void);
 392 extern void tty_unhangup(struct file *filp);
 393 extern int tty_hung_up_p(struct file *filp);
 394 extern void do_SAK(struct tty_struct *tty);
 395 extern void __do_SAK(struct tty_struct *tty);
 396 extern void disassociate_ctty(int priv);
 397 extern void no_tty(void);
 398 extern void tty_flip_buffer_push(struct tty_struct *tty);
 399 extern void tty_flush_to_ldisc(struct tty_struct *tty);
 400 extern void tty_buffer_free_all(struct tty_struct *tty);
 401 extern void tty_buffer_flush(struct tty_struct *tty);
 402 extern void tty_buffer_init(struct tty_struct *tty);
 403 extern speed_t tty_get_baud_rate(struct tty_struct *tty);
 404 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
 405 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
 406 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
 407                                                 speed_t ibaud, speed_t obaud);
 408 extern void tty_encode_baud_rate(struct tty_struct *tty,
 409                                                 speed_t ibaud, speed_t obaud);
 410 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
 411 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
 412
 413 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
 414 extern void tty_ldisc_deref(struct tty_ldisc *);
 415 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
 416 extern void tty_ldisc_hangup(struct tty_struct *tty);
 417 extern const struct file_operations tty_ldiscs_proc_fops;
 418
 419 extern void tty_wakeup(struct tty_struct *tty);
 420 extern void tty_ldisc_flush(struct tty_struct *tty);
 421
 422 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 423 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
 424                         unsigned int cmd, unsigned long arg);
 425 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
 426 extern dev_t tty_devnum(struct tty_struct *tty);
 427 extern void proc_clear_tty(struct task_struct *p);
 428 extern struct tty_struct *get_current_tty(void);
 429 extern void tty_default_fops(struct file_operations *fops);
 430 extern struct tty_struct *alloc_tty_struct(void);
 431 extern void free_tty_struct(struct tty_struct *tty);
 432 extern void initialize_tty_struct(struct tty_struct *tty,
 433                 struct tty_driver *driver, int idx);
 434 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
 435                                                                 int first_ok);
 436 extern void tty_release_dev(struct file *filp);
 437 extern int tty_init_termios(struct tty_struct *tty);
 438
 439 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
 440 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
 441
 442 extern struct mutex tty_mutex;
 443
 444 extern void tty_write_unlock(struct tty_struct *tty);
 445 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
 446 #define tty_is_writelocked(tty)  (mutex_is_locked(&tty->atomic_write_lock))
 447
 448 extern void tty_port_init(struct tty_port *port);
 449 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
 450 extern void tty_port_free_xmit_buf(struct tty_port *port);
 451 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
 452 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
 453 extern int tty_port_carrier_raised(struct tty_port *port);
 454 extern void tty_port_raise_dtr_rts(struct tty_port *port);
 455 extern void tty_port_lower_dtr_rts(struct tty_port *port);
 456 extern void tty_port_hangup(struct tty_port *port);
 457 extern int tty_port_block_til_ready(struct tty_port *port,
 458                                 struct tty_struct *tty, struct file *filp);
 459 extern int tty_port_close_start(struct tty_port *port,
 460                                 struct tty_struct *tty, struct file *filp);
 461 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
 462
 463 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
 464 extern int tty_unregister_ldisc(int disc);
 465 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
 466 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
 467 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
 468 extern void tty_ldisc_init(struct tty_struct *tty);
 469 extern void tty_ldisc_begin(void);
 470 /* This last one is just for the tty layer internals and shouldn't be used elsewhere */
 471 extern void tty_ldisc_enable(struct tty_struct *tty);
 472
 473
 474 /* n_tty.c */
 475 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
 476
 477 /* tty_audit.c */
 478 #ifdef CONFIG_AUDIT
 479 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
 480                                size_t size);
 481 extern void tty_audit_exit(void);
 482 extern void tty_audit_fork(struct signal_struct *sig);
 483 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
 484 extern void tty_audit_push(struct tty_struct *tty);
 485 extern void tty_audit_push_task(struct task_struct *tsk,
 486                                         uid_t loginuid, u32 sessionid);
 487 #else
 488 static inline void tty_audit_add_data(struct tty_struct *tty,
 489                                       unsigned char *data, size_t size)
 490 {
 491 }
 492 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
 493 {
 494 }
 495 static inline void tty_audit_exit(void)
 496 {
 497 }
 498 static inline void tty_audit_fork(struct signal_struct *sig)
 499 {
 500 }
 501 static inline void tty_audit_push(struct tty_struct *tty)
 502 {
 503 }
 504 static inline void tty_audit_push_task(struct task_struct *tsk,
 505                                         uid_t loginuid, u32 sessionid)
 506 {
 507 }
 508 #endif
 509
 510 /* tty_ioctl.c */
 511 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
 512                        unsigned int cmd, unsigned long arg);
 513
 514 /* serial.c */
 515
 516 extern void serial_console_init(void);
 517
 518 /* pcxx.c */
 519
 520 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
 521
 522 /* vt.c */
 523
 524 extern int vt_ioctl(struct tty_struct *tty, struct file *file,
 525                     unsigned int cmd, unsigned long arg);
 526
 527 #endif /* __KERNEL__ */
 528 #endif