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