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         /* Control the DTR line */
 191         void (*dtr_rts)(struct tty_port *port, int raise);
 192         /* Called when the last close completes or a hangup finishes
 193            IFF the port was initialized. Do not use to free resources */
 194         void (*shutdown)(struct tty_port *port);
 195         void (*drop)(struct tty_port *port);
 196 };
 197
 198 struct tty_port {
 199         struct tty_struct       *tty;           /* Back pointer */
 200         const struct tty_port_operations *ops;  /* Port operations */
 201         spinlock_t              lock;           /* Lock protecting tty field */
 202         int                     blocked_open;   /* Waiting to open */
 203         int                     count;          /* Usage count */
 204         wait_queue_head_t       open_wait;      /* Open waiters */
 205         wait_queue_head_t       close_wait;     /* Close waiters */
 206         wait_queue_head_t       delta_msr_wait; /* Modem status change */
 207         unsigned long           flags;          /* TTY flags ASY_*/
 208         struct mutex            mutex;          /* Locking */
 209         unsigned char           *xmit_buf;      /* Optional buffer */
 210         unsigned int            close_delay;    /* Close port delay */
 211         unsigned int            closing_wait;   /* Delay for output */
 212         int                     drain_delay;    /* Set to zero if no pure time
 213                                                    based drain is needed else
 214                                                    set to size of fifo */
 215 };
 216
 217 /*
 218  * Where all of the state associated with a tty is kept while the tty
 219  * is open.  Since the termios state should be kept even if the tty
 220  * has been closed --- for things like the baud rate, etc --- it is
 221  * not stored here, but rather a pointer to the real state is stored
 222  * here.  Possible the winsize structure should have the same
 223  * treatment, but (1) the default 80x24 is usually right and (2) it's
 224  * most often used by a windowing system, which will set the correct
 225  * size each time the window is created or resized anyway.
 226  *                                              - TYT, 9/14/92
 227  */
 228
 229 struct tty_operations;
 230
 231 struct tty_struct {
 232         int     magic;
 233         struct kref kref;
 234         struct tty_driver *driver;
 235         const struct tty_operations *ops;
 236         int index;
 237
 238         /* Protects ldisc changes: Lock tty not pty */
 239         struct mutex ldisc_mutex;
 240         struct tty_ldisc *ldisc;
 241
 242         struct mutex termios_mutex;
 243         spinlock_t ctrl_lock;
 244         /* Termios values are protected by the termios mutex */
 245         struct ktermios *termios, *termios_locked;
 246         struct termiox *termiox;        /* May be NULL for unsupported */
 247         char name[64];
 248         struct pid *pgrp;               /* Protected by ctrl lock */
 249         struct pid *session;
 250         unsigned long flags;
 251         int count;
 252         struct winsize winsize;         /* termios mutex */
 253         unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
 254         unsigned char low_latency:1, warned:1;
 255         unsigned char ctrl_status;      /* ctrl_lock */
 256         unsigned int receive_room;      /* Bytes free for queue */
 257
 258         struct tty_struct *link;
 259         struct fasync_struct *fasync;
 260         struct tty_bufhead buf;         /* Locked internally */
 261         int alt_speed;          /* For magic substitution of 38400 bps */
 262         wait_queue_head_t write_wait;
 263         wait_queue_head_t read_wait;
 264         struct work_struct hangup_work;
 265         void *disc_data;
 266         void *driver_data;
 267         struct list_head tty_files;
 268
 269 #define N_TTY_BUF_SIZE 4096
 270
 271         /*
 272          * The following is data for the N_TTY line discipline.  For
 273          * historical reasons, this is included in the tty structure.
 274          * Mostly locked by the BKL.
 275          */
 276         unsigned int column;
 277         unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
 278         unsigned char closing:1;
 279         unsigned char echo_overrun:1;
 280         unsigned short minimum_to_wake;
 281         unsigned long overrun_time;
 282         int num_overrun;
 283         unsigned long process_char_map[256/(8*sizeof(unsigned long))];
 284         char *read_buf;
 285         int read_head;
 286         int read_tail;
 287         int read_cnt;
 288         unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
 289         unsigned char *echo_buf;
 290         unsigned int echo_pos;
 291         unsigned int echo_cnt;
 292         int canon_data;
 293         unsigned long canon_head;
 294         unsigned int canon_column;
 295         struct mutex atomic_read_lock;
 296         struct mutex atomic_write_lock;
 297         struct mutex output_lock;
 298         struct mutex echo_lock;
 299         unsigned char *write_buf;
 300         int write_cnt;
 301         spinlock_t read_lock;
 302         /* If the tty has a pending do_SAK, queue it here - akpm */
 303         struct work_struct SAK_work;
 304         struct tty_port *port;
 305 };
 306
 307 /* tty magic number */
 308 #define TTY_MAGIC               0x5401
 309
 310 /*
 311  * These bits are used in the flags field of the tty structure.
 312  *
 313  * So that interrupts won't be able to mess up the queues,
 314  * copy_to_cooked must be atomic with respect to itself, as must
 315  * tty->write.  Thus, you must use the inline functions set_bit() and
 316  * clear_bit() to make things atomic.
 317  */
 318 #define TTY_THROTTLED           0       /* Call unthrottle() at threshold min */
 319 #define TTY_IO_ERROR            1       /* Cause an I/O error (may be no ldisc too) */
 320 #define TTY_OTHER_CLOSED        2       /* Other side (if any) has closed */
 321 #define TTY_EXCLUSIVE           3       /* Exclusive open mode */
 322 #define TTY_DEBUG               4       /* Debugging */
 323 #define TTY_DO_WRITE_WAKEUP     5       /* Call write_wakeup after queuing new */
 324 #define TTY_PUSH                6       /* n_tty private */
 325 #define TTY_CLOSING             7       /* ->close() in progress */
 326 #define TTY_LDISC               9       /* Line discipline attached */
 327 #define TTY_LDISC_CHANGING      10      /* Line discipline changing */
 328 #define TTY_LDISC_OPEN          11      /* Line discipline is open */
 329 #define TTY_HW_COOK_OUT         14      /* Hardware can do output cooking */
 330 #define TTY_HW_COOK_IN          15      /* Hardware can do input cooking */
 331 #define TTY_PTY_LOCK            16      /* pty private */
 332 #define TTY_NO_WRITE_SPLIT      17      /* Preserve write boundaries to driver */
 333 #define TTY_HUPPED              18      /* Post driver->hangup() */
 334 #define TTY_FLUSHING            19      /* Flushing to ldisc in progress */
 335 #define TTY_FLUSHPENDING        20      /* Queued buffer flush pending */
 336
 337 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
 338
 339 extern void tty_write_flush(struct tty_struct *);
 340
 341 extern struct ktermios tty_std_termios;
 342
 343 extern int kmsg_redirect;
 344
 345 extern void console_init(void);
 346 extern int vcs_init(void);
 347
 348 extern struct class *tty_class;
 349
 350 /**
 351  *      tty_kref_get            -       get a tty reference
 352  *      @tty: tty device
 353  *
 354  *      Return a new reference to a tty object. The caller must hold
 355  *      sufficient locks/counts to ensure that their existing reference cannot
 356  *      go away
 357  */
 358
 359 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
 360 {
 361         if (tty)
 362                 kref_get(&tty->kref);
 363         return tty;
 364 }
 365 extern void tty_kref_put(struct tty_struct *tty);
 366
 367 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
 368                               const char *routine);
 369 extern char *tty_name(struct tty_struct *tty, char *buf);
 370 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
 371 extern int tty_check_change(struct tty_struct *tty);
 372 extern void stop_tty(struct tty_struct *tty);
 373 extern void start_tty(struct tty_struct *tty);
 374 extern int tty_register_driver(struct tty_driver *driver);
 375 extern int tty_unregister_driver(struct tty_driver *driver);
 376 extern struct device *tty_register_device(struct tty_driver *driver,
 377                                           unsigned index, struct device *dev);
 378 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
 379 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
 380                              int buflen);
 381 extern void tty_write_message(struct tty_struct *tty, char *msg);
 382 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
 383 extern int tty_chars_in_buffer(struct tty_struct *tty);
 384 extern int tty_write_room(struct tty_struct *tty);
 385 extern void tty_driver_flush_buffer(struct tty_struct *tty);
 386 extern void tty_throttle(struct tty_struct *tty);
 387 extern void tty_unthrottle(struct tty_struct *tty);
 388 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
 389 extern void tty_shutdown(struct tty_struct *tty);
 390 extern void tty_free_termios(struct tty_struct *tty);
 391 extern int is_current_pgrp_orphaned(void);
 392 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
 393 extern int is_ignored(int sig);
 394 extern int tty_signal(int sig, struct tty_struct *tty);
 395 extern void tty_hangup(struct tty_struct *tty);
 396 extern void tty_vhangup(struct tty_struct *tty);
 397 extern void tty_vhangup_self(void);
 398 extern void tty_unhangup(struct file *filp);
 399 extern int tty_hung_up_p(struct file *filp);
 400 extern void do_SAK(struct tty_struct *tty);
 401 extern void __do_SAK(struct tty_struct *tty);
 402 extern void disassociate_ctty(int priv);
 403 extern void no_tty(void);
 404 extern void tty_flip_buffer_push(struct tty_struct *tty);
 405 extern void tty_flush_to_ldisc(struct tty_struct *tty);
 406 extern void tty_buffer_free_all(struct tty_struct *tty);
 407 extern void tty_buffer_flush(struct tty_struct *tty);
 408 extern void tty_buffer_init(struct tty_struct *tty);
 409 extern speed_t tty_get_baud_rate(struct tty_struct *tty);
 410 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
 411 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
 412 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
 413                                                 speed_t ibaud, speed_t obaud);
 414 extern void tty_encode_baud_rate(struct tty_struct *tty,
 415                                                 speed_t ibaud, speed_t obaud);
 416 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
 417 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
 418
 419 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
 420 extern void tty_ldisc_deref(struct tty_ldisc *);
 421 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
 422 extern void tty_ldisc_hangup(struct tty_struct *tty);
 423 extern const struct file_operations tty_ldiscs_proc_fops;
 424
 425 extern void tty_wakeup(struct tty_struct *tty);
 426 extern void tty_ldisc_flush(struct tty_struct *tty);
 427
 428 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 429 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
 430                         unsigned int cmd, unsigned long arg);
 431 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
 432 extern dev_t tty_devnum(struct tty_struct *tty);
 433 extern void proc_clear_tty(struct task_struct *p);
 434 extern struct tty_struct *get_current_tty(void);
 435 extern void tty_default_fops(struct file_operations *fops);
 436 extern struct tty_struct *alloc_tty_struct(void);
 437 extern void free_tty_struct(struct tty_struct *tty);
 438 extern void initialize_tty_struct(struct tty_struct *tty,
 439                 struct tty_driver *driver, int idx);
 440 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
 441                                                                 int first_ok);
 442 extern void tty_release_dev(struct file *filp);
 443 extern int tty_init_termios(struct tty_struct *tty);
 444
 445 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
 446 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
 447
 448 extern struct mutex tty_mutex;
 449
 450 extern void tty_write_unlock(struct tty_struct *tty);
 451 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
 452 #define tty_is_writelocked(tty)  (mutex_is_locked(&tty->atomic_write_lock))
 453
 454 extern void tty_port_init(struct tty_port *port);
 455 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
 456 extern void tty_port_free_xmit_buf(struct tty_port *port);
 457 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
 458 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
 459 extern int tty_port_carrier_raised(struct tty_port *port);
 460 extern void tty_port_raise_dtr_rts(struct tty_port *port);
 461 extern void tty_port_lower_dtr_rts(struct tty_port *port);
 462 extern void tty_port_hangup(struct tty_port *port);
 463 extern int tty_port_block_til_ready(struct tty_port *port,
 464                                 struct tty_struct *tty, struct file *filp);
 465 extern int tty_port_close_start(struct tty_port *port,
 466                                 struct tty_struct *tty, struct file *filp);
 467 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
 468 extern void tty_port_close(struct tty_port *port,
 469                                 struct tty_struct *tty, struct file *filp);
 470 extern inline int tty_port_users(struct tty_port *port)
 471 {
 472         return port->count + port->blocked_open;
 473 }
 474
 475 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
 476 extern int tty_unregister_ldisc(int disc);
 477 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
 478 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
 479 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
 480 extern void tty_ldisc_init(struct tty_struct *tty);
 481 extern void tty_ldisc_begin(void);
 482 /* This last one is just for the tty layer internals and shouldn't be used elsewhere */
 483 extern void tty_ldisc_enable(struct tty_struct *tty);
 484
 485
 486 /* n_tty.c */
 487 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
 488
 489 /* tty_audit.c */
 490 #ifdef CONFIG_AUDIT
 491 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
 492                                size_t size);
 493 extern void tty_audit_exit(void);
 494 extern void tty_audit_fork(struct signal_struct *sig);
 495 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
 496 extern void tty_audit_push(struct tty_struct *tty);
 497 extern void tty_audit_push_task(struct task_struct *tsk,
 498                                         uid_t loginuid, u32 sessionid);
 499 #else
 500 static inline void tty_audit_add_data(struct tty_struct *tty,
 501                                       unsigned char *data, size_t size)
 502 {
 503 }
 504 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
 505 {
 506 }
 507 static inline void tty_audit_exit(void)
 508 {
 509 }
 510 static inline void tty_audit_fork(struct signal_struct *sig)
 511 {
 512 }
 513 static inline void tty_audit_push(struct tty_struct *tty)
 514 {
 515 }
 516 static inline void tty_audit_push_task(struct task_struct *tsk,
 517                                         uid_t loginuid, u32 sessionid)
 518 {
 519 }
 520 #endif
 521
 522 /* tty_ioctl.c */
 523 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
 524                        unsigned int cmd, unsigned long arg);
 525
 526 /* serial.c */
 527
 528 extern void serial_console_init(void);
 529
 530 /* pcxx.c */
 531
 532 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
 533
 534 /* vt.c */
 535
 536 extern int vt_ioctl(struct tty_struct *tty, struct file *file,
 537                     unsigned int cmd, unsigned long arg);
 538
 539 extern long vt_compat_ioctl(struct tty_struct *tty, struct file * file,
 540                      unsigned int cmd, unsigned long arg);
 541
 542 #endif /* __KERNEL__ */
 543 #endif