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               30
  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 #define N_V253          19      /* Codec control over voice modem */
  50 #define N_CAIF          20      /* CAIF protocol for talking to modems */
  51 #define N_GSM0710       21      /* GSM 0710 Mux */
  52 #define N_TI_WL         22      /* for TI's WL BT, FM, GPS combo chips */
  53
  54 /*
  55  * This character is the same as _POSIX_VDISABLE: it cannot be used as
  56  * a c_cc[] character, but indicates that a particular special character
  57  * isn't in use (eg VINTR has no character etc)
  58  */
  59 #define __DISABLED_CHAR '\0'
  60
  61 struct tty_buffer {
  62         struct tty_buffer *next;
  63         char *char_buf_ptr;
  64         unsigned char *flag_buf_ptr;
  65         int used;
  66         int size;
  67         int commit;
  68         int read;
  69         /* Data points here */
  70         unsigned long data[0];
  71 };
  72
  73 /*
  74  * We default to dicing tty buffer allocations to this many characters
  75  * in order to avoid multiple page allocations. We know the size of
  76  * tty_buffer itself but it must also be taken into account that the
  77  * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
  78  * logic this must match
  79  */
  80
  81 #define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
  82
  83
  84 struct tty_bufhead {
  85         struct delayed_work work;
  86         spinlock_t lock;
  87         struct tty_buffer *head;        /* Queue head */
  88         struct tty_buffer *tail;        /* Active buffer */
  89         struct tty_buffer *free;        /* Free queue head */
  90         int memory_used;                /* Buffer space used excluding
  91                                                                 free queue */
  92 };
  93 /*
  94  * When a break, frame error, or parity error happens, these codes are
  95  * stuffed into the flags buffer.
  96  */
  97 #define TTY_NORMAL      0
  98 #define TTY_BREAK       1
  99 #define TTY_FRAME       2
 100 #define TTY_PARITY      3
 101 #define TTY_OVERRUN     4
 102
 103 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
 104 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
 105 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
 106 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
 107 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
 108 #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
 109 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
 110 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
 111 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
 112 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
 113 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
 114 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
 115 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
 116 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
 117 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
 118 #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
 119 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
 120
 121 #define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f))
 122 #define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f))
 123 #define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f))
 124 #define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f))
 125
 126 #define I_IGNBRK(tty)   _I_FLAG((tty), IGNBRK)
 127 #define I_BRKINT(tty)   _I_FLAG((tty), BRKINT)
 128 #define I_IGNPAR(tty)   _I_FLAG((tty), IGNPAR)
 129 #define I_PARMRK(tty)   _I_FLAG((tty), PARMRK)
 130 #define I_INPCK(tty)    _I_FLAG((tty), INPCK)
 131 #define I_ISTRIP(tty)   _I_FLAG((tty), ISTRIP)
 132 #define I_INLCR(tty)    _I_FLAG((tty), INLCR)
 133 #define I_IGNCR(tty)    _I_FLAG((tty), IGNCR)
 134 #define I_ICRNL(tty)    _I_FLAG((tty), ICRNL)
 135 #define I_IUCLC(tty)    _I_FLAG((tty), IUCLC)
 136 #define I_IXON(tty)     _I_FLAG((tty), IXON)
 137 #define I_IXANY(tty)    _I_FLAG((tty), IXANY)
 138 #define I_IXOFF(tty)    _I_FLAG((tty), IXOFF)
 139 #define I_IMAXBEL(tty)  _I_FLAG((tty), IMAXBEL)
 140 #define I_IUTF8(tty)    _I_FLAG((tty), IUTF8)
 141
 142 #define O_OPOST(tty)    _O_FLAG((tty), OPOST)
 143 #define O_OLCUC(tty)    _O_FLAG((tty), OLCUC)
 144 #define O_ONLCR(tty)    _O_FLAG((tty), ONLCR)
 145 #define O_OCRNL(tty)    _O_FLAG((tty), OCRNL)
 146 #define O_ONOCR(tty)    _O_FLAG((tty), ONOCR)
 147 #define O_ONLRET(tty)   _O_FLAG((tty), ONLRET)
 148 #define O_OFILL(tty)    _O_FLAG((tty), OFILL)
 149 #define O_OFDEL(tty)    _O_FLAG((tty), OFDEL)
 150 #define O_NLDLY(tty)    _O_FLAG((tty), NLDLY)
 151 #define O_CRDLY(tty)    _O_FLAG((tty), CRDLY)
 152 #define O_TABDLY(tty)   _O_FLAG((tty), TABDLY)
 153 #define O_BSDLY(tty)    _O_FLAG((tty), BSDLY)
 154 #define O_VTDLY(tty)    _O_FLAG((tty), VTDLY)
 155 #define O_FFDLY(tty)    _O_FLAG((tty), FFDLY)
 156
 157 #define C_BAUD(tty)     _C_FLAG((tty), CBAUD)
 158 #define C_CSIZE(tty)    _C_FLAG((tty), CSIZE)
 159 #define C_CSTOPB(tty)   _C_FLAG((tty), CSTOPB)
 160 #define C_CREAD(tty)    _C_FLAG((tty), CREAD)
 161 #define C_PARENB(tty)   _C_FLAG((tty), PARENB)
 162 #define C_PARODD(tty)   _C_FLAG((tty), PARODD)
 163 #define C_HUPCL(tty)    _C_FLAG((tty), HUPCL)
 164 #define C_CLOCAL(tty)   _C_FLAG((tty), CLOCAL)
 165 #define C_CIBAUD(tty)   _C_FLAG((tty), CIBAUD)
 166 #define C_CRTSCTS(tty)  _C_FLAG((tty), CRTSCTS)
 167
 168 #define L_ISIG(tty)     _L_FLAG((tty), ISIG)
 169 #define L_ICANON(tty)   _L_FLAG((tty), ICANON)
 170 #define L_XCASE(tty)    _L_FLAG((tty), XCASE)
 171 #define L_ECHO(tty)     _L_FLAG((tty), ECHO)
 172 #define L_ECHOE(tty)    _L_FLAG((tty), ECHOE)
 173 #define L_ECHOK(tty)    _L_FLAG((tty), ECHOK)
 174 #define L_ECHONL(tty)   _L_FLAG((tty), ECHONL)
 175 #define L_NOFLSH(tty)   _L_FLAG((tty), NOFLSH)
 176 #define L_TOSTOP(tty)   _L_FLAG((tty), TOSTOP)
 177 #define L_ECHOCTL(tty)  _L_FLAG((tty), ECHOCTL)
 178 #define L_ECHOPRT(tty)  _L_FLAG((tty), ECHOPRT)
 179 #define L_ECHOKE(tty)   _L_FLAG((tty), ECHOKE)
 180 #define L_FLUSHO(tty)   _L_FLAG((tty), FLUSHO)
 181 #define L_PENDIN(tty)   _L_FLAG((tty), PENDIN)
 182 #define L_IEXTEN(tty)   _L_FLAG((tty), IEXTEN)
 183 #define L_EXTPROC(tty)  _L_FLAG((tty), EXTPROC)
 184
 185 struct device;
 186 struct signal_struct;
 187
 188 /*
 189  * Port level information. Each device keeps its own port level information
 190  * so provide a common structure for those ports wanting to use common support
 191  * routines.
 192  *
 193  * The tty port has a different lifetime to the tty so must be kept apart.
 194  * In addition be careful as tty -> port mappings are valid for the life
 195  * of the tty object but in many cases port -> tty mappings are valid only
 196  * until a hangup so don't use the wrong path.
 197  */
 198
 199 struct tty_port;
 200
 201 struct tty_port_operations {
 202         /* Return 1 if the carrier is raised */
 203         int (*carrier_raised)(struct tty_port *port);
 204         /* Control the DTR line */
 205         void (*dtr_rts)(struct tty_port *port, int raise);
 206         /* Called when the last close completes or a hangup finishes
 207            IFF the port was initialized. Do not use to free resources. Called
 208            under the port mutex to serialize against activate/shutdowns */
 209         void (*shutdown)(struct tty_port *port);
 210         void (*drop)(struct tty_port *port);
 211         /* Called under the port mutex from tty_port_open, serialized using
 212            the port mutex */
 213         /* FIXME: long term getting the tty argument *out* of this would be
 214            good for consoles */
 215         int (*activate)(struct tty_port *port, struct tty_struct *tty);
 216         /* Called on the final put of a port */
 217         void (*destruct)(struct tty_port *port);
 218 };
 219
 220 struct tty_port {
 221         struct tty_struct       *tty;           /* Back pointer */
 222         const struct tty_port_operations *ops;  /* Port operations */
 223         spinlock_t              lock;           /* Lock protecting tty field */
 224         int                     blocked_open;   /* Waiting to open */
 225         int                     count;          /* Usage count */
 226         wait_queue_head_t       open_wait;      /* Open waiters */
 227         wait_queue_head_t       close_wait;     /* Close waiters */
 228         wait_queue_head_t       delta_msr_wait; /* Modem status change */
 229         unsigned long           flags;          /* TTY flags ASY_*/
 230         unsigned char           console:1;      /* port is a console */
 231         struct mutex            mutex;          /* Locking */
 232         struct mutex            buf_mutex;      /* Buffer alloc lock */
 233         unsigned char           *xmit_buf;      /* Optional buffer */
 234         unsigned int            close_delay;    /* Close port delay */
 235         unsigned int            closing_wait;   /* Delay for output */
 236         int                     drain_delay;    /* Set to zero if no pure time
 237                                                    based drain is needed else
 238                                                    set to size of fifo */
 239         struct kref             kref;           /* Ref counter */
 240 };
 241
 242 /*
 243  * Where all of the state associated with a tty is kept while the tty
 244  * is open.  Since the termios state should be kept even if the tty
 245  * has been closed --- for things like the baud rate, etc --- it is
 246  * not stored here, but rather a pointer to the real state is stored
 247  * here.  Possible the winsize structure should have the same
 248  * treatment, but (1) the default 80x24 is usually right and (2) it's
 249  * most often used by a windowing system, which will set the correct
 250  * size each time the window is created or resized anyway.
 251  *                                              - TYT, 9/14/92
 252  */
 253
 254 struct tty_operations;
 255
 256 struct tty_struct {
 257         int     magic;
 258         struct kref kref;
 259         struct device *dev;
 260         struct tty_driver *driver;
 261         const struct tty_operations *ops;
 262         int index;
 263
 264         /* Protects ldisc changes: Lock tty not pty */
 265         struct mutex ldisc_mutex;
 266         struct tty_ldisc *ldisc;
 267
 268         struct mutex termios_mutex;
 269         spinlock_t ctrl_lock;
 270         /* Termios values are protected by the termios mutex */
 271         struct ktermios *termios, *termios_locked;
 272         struct termiox *termiox;        /* May be NULL for unsupported */
 273         char name[64];
 274         struct pid *pgrp;               /* Protected by ctrl lock */
 275         struct pid *session;
 276         unsigned long flags;
 277         int count;
 278         struct winsize winsize;         /* termios mutex */
 279         unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
 280         unsigned char low_latency:1, warned:1;
 281         unsigned char ctrl_status;      /* ctrl_lock */
 282         unsigned int receive_room;      /* Bytes free for queue */
 283
 284         struct tty_struct *link;
 285         struct fasync_struct *fasync;
 286         struct tty_bufhead buf;         /* Locked internally */
 287         int alt_speed;          /* For magic substitution of 38400 bps */
 288         wait_queue_head_t write_wait;
 289         wait_queue_head_t read_wait;
 290         struct work_struct hangup_work;
 291         void *disc_data;
 292         void *driver_data;
 293         struct list_head tty_files;
 294
 295 #define N_TTY_BUF_SIZE 4096
 296
 297         /*
 298          * The following is data for the N_TTY line discipline.  For
 299          * historical reasons, this is included in the tty structure.
 300          * Mostly locked by the BKL.
 301          */
 302         unsigned int column;
 303         unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
 304         unsigned char closing:1;
 305         unsigned char echo_overrun:1;
 306         unsigned short minimum_to_wake;
 307         unsigned long overrun_time;
 308         int num_overrun;
 309         unsigned long process_char_map[256/(8*sizeof(unsigned long))];
 310         char *read_buf;
 311         int read_head;
 312         int read_tail;
 313         int read_cnt;
 314         unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
 315         unsigned char *echo_buf;
 316         unsigned int echo_pos;
 317         unsigned int echo_cnt;
 318         int canon_data;
 319         unsigned long canon_head;
 320         unsigned int canon_column;
 321         struct mutex atomic_read_lock;
 322         struct mutex atomic_write_lock;
 323         struct mutex output_lock;
 324         struct mutex echo_lock;
 325         unsigned char *write_buf;
 326         int write_cnt;
 327         spinlock_t read_lock;
 328         /* If the tty has a pending do_SAK, queue it here - akpm */
 329         struct work_struct SAK_work;
 330         struct tty_port *port;
 331 };
 332
 333 /* Each of a tty's open files has private_data pointing to tty_file_private */
 334 struct tty_file_private {
 335         struct tty_struct *tty;
 336         struct file *file;
 337         struct list_head list;
 338 };
 339
 340 /* tty magic number */
 341 #define TTY_MAGIC               0x5401
 342
 343 /*
 344  * These bits are used in the flags field of the tty structure.
 345  *
 346  * So that interrupts won't be able to mess up the queues,
 347  * copy_to_cooked must be atomic with respect to itself, as must
 348  * tty->write.  Thus, you must use the inline functions set_bit() and
 349  * clear_bit() to make things atomic.
 350  */
 351 #define TTY_THROTTLED           0       /* Call unthrottle() at threshold min */
 352 #define TTY_IO_ERROR            1       /* Cause an I/O error (may be no ldisc too) */
 353 #define TTY_OTHER_CLOSED        2       /* Other side (if any) has closed */
 354 #define TTY_EXCLUSIVE           3       /* Exclusive open mode */
 355 #define TTY_DEBUG               4       /* Debugging */
 356 #define TTY_DO_WRITE_WAKEUP     5       /* Call write_wakeup after queuing new */
 357 #define TTY_PUSH                6       /* n_tty private */
 358 #define TTY_CLOSING             7       /* ->close() in progress */
 359 #define TTY_LDISC               9       /* Line discipline attached */
 360 #define TTY_LDISC_CHANGING      10      /* Line discipline changing */
 361 #define TTY_LDISC_OPEN          11      /* Line discipline is open */
 362 #define TTY_HW_COOK_OUT         14      /* Hardware can do output cooking */
 363 #define TTY_HW_COOK_IN          15      /* Hardware can do input cooking */
 364 #define TTY_PTY_LOCK            16      /* pty private */
 365 #define TTY_NO_WRITE_SPLIT      17      /* Preserve write boundaries to driver */
 366 #define TTY_HUPPED              18      /* Post driver->hangup() */
 367 #define TTY_FLUSHING            19      /* Flushing to ldisc in progress */
 368 #define TTY_FLUSHPENDING        20      /* Queued buffer flush pending */
 369 #define TTY_HUPPING             21      /* ->hangup() in progress */
 370
 371 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
 372
 373 extern void tty_write_flush(struct tty_struct *);
 374
 375 extern struct ktermios tty_std_termios;
 376
 377 extern void console_init(void);
 378 extern int vcs_init(void);
 379
 380 extern struct class *tty_class;
 381
 382 /**
 383  *      tty_kref_get            -       get a tty reference
 384  *      @tty: tty device
 385  *
 386  *      Return a new reference to a tty object. The caller must hold
 387  *      sufficient locks/counts to ensure that their existing reference cannot
 388  *      go away
 389  */
 390
 391 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
 392 {
 393         if (tty)
 394                 kref_get(&tty->kref);
 395         return tty;
 396 }
 397 extern void tty_kref_put(struct tty_struct *tty);
 398
 399 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
 400                               const char *routine);
 401 extern char *tty_name(struct tty_struct *tty, char *buf);
 402 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
 403 extern int tty_check_change(struct tty_struct *tty);
 404 extern void stop_tty(struct tty_struct *tty);
 405 extern void start_tty(struct tty_struct *tty);
 406 extern int tty_register_driver(struct tty_driver *driver);
 407 extern int tty_unregister_driver(struct tty_driver *driver);
 408 extern struct device *tty_register_device(struct tty_driver *driver,
 409                                           unsigned index, struct device *dev);
 410 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
 411 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
 412                              int buflen);
 413 extern void tty_write_message(struct tty_struct *tty, char *msg);
 414 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
 415 extern int tty_chars_in_buffer(struct tty_struct *tty);
 416 extern int tty_write_room(struct tty_struct *tty);
 417 extern void tty_driver_flush_buffer(struct tty_struct *tty);
 418 extern void tty_throttle(struct tty_struct *tty);
 419 extern void tty_unthrottle(struct tty_struct *tty);
 420 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
 421 extern void tty_shutdown(struct tty_struct *tty);
 422 extern void tty_free_termios(struct tty_struct *tty);
 423 extern int is_current_pgrp_orphaned(void);
 424 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
 425 extern int is_ignored(int sig);
 426 extern int tty_signal(int sig, struct tty_struct *tty);
 427 extern void tty_hangup(struct tty_struct *tty);
 428 extern void tty_vhangup(struct tty_struct *tty);
 429 extern void tty_vhangup_locked(struct tty_struct *tty);
 430 extern void tty_vhangup_self(void);
 431 extern void tty_unhangup(struct file *filp);
 432 extern int tty_hung_up_p(struct file *filp);
 433 extern void do_SAK(struct tty_struct *tty);
 434 extern void __do_SAK(struct tty_struct *tty);
 435 extern void disassociate_ctty(int priv);
 436 extern void no_tty(void);
 437 extern void tty_flip_buffer_push(struct tty_struct *tty);
 438 extern void tty_flush_to_ldisc(struct tty_struct *tty);
 439 extern void tty_buffer_free_all(struct tty_struct *tty);
 440 extern void tty_buffer_flush(struct tty_struct *tty);
 441 extern void tty_buffer_init(struct tty_struct *tty);
 442 extern speed_t tty_get_baud_rate(struct tty_struct *tty);
 443 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
 444 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
 445 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
 446                                                 speed_t ibaud, speed_t obaud);
 447 extern void tty_encode_baud_rate(struct tty_struct *tty,
 448                                                 speed_t ibaud, speed_t obaud);
 449 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
 450 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
 451
 452 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
 453 extern void tty_ldisc_deref(struct tty_ldisc *);
 454 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
 455 extern void tty_ldisc_hangup(struct tty_struct *tty);
 456 extern const struct file_operations tty_ldiscs_proc_fops;
 457
 458 extern void tty_wakeup(struct tty_struct *tty);
 459 extern void tty_ldisc_flush(struct tty_struct *tty);
 460
 461 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 462 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
 463                         unsigned int cmd, unsigned long arg);
 464 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
 465 extern dev_t tty_devnum(struct tty_struct *tty);
 466 extern void proc_clear_tty(struct task_struct *p);
 467 extern struct tty_struct *get_current_tty(void);
 468 extern void tty_default_fops(struct file_operations *fops);
 469 extern struct tty_struct *alloc_tty_struct(void);
 470 extern int tty_add_file(struct tty_struct *tty, struct file *file);
 471 extern void free_tty_struct(struct tty_struct *tty);
 472 extern void initialize_tty_struct(struct tty_struct *tty,
 473                 struct tty_driver *driver, int idx);
 474 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
 475                                                                 int first_ok);
 476 extern int tty_release(struct inode *inode, struct file *filp);
 477 extern int tty_init_termios(struct tty_struct *tty);
 478
 479 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
 480 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
 481
 482 extern struct mutex tty_mutex;
 483 extern spinlock_t tty_files_lock;
 484
 485 extern void tty_write_unlock(struct tty_struct *tty);
 486 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
 487 #define tty_is_writelocked(tty)  (mutex_is_locked(&tty->atomic_write_lock))
 488
 489 extern void tty_port_init(struct tty_port *port);
 490 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
 491 extern void tty_port_free_xmit_buf(struct tty_port *port);
 492 extern void tty_port_put(struct tty_port *port);
 493
 494 static inline struct tty_port *tty_port_get(struct tty_port *port)
 495 {
 496         if (port)
 497                 kref_get(&port->kref);
 498         return port;
 499 }
 500
 501 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
 502 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
 503 extern int tty_port_carrier_raised(struct tty_port *port);
 504 extern void tty_port_raise_dtr_rts(struct tty_port *port);
 505 extern void tty_port_lower_dtr_rts(struct tty_port *port);
 506 extern void tty_port_hangup(struct tty_port *port);
 507 extern int tty_port_block_til_ready(struct tty_port *port,
 508                                 struct tty_struct *tty, struct file *filp);
 509 extern int tty_port_close_start(struct tty_port *port,
 510                                 struct tty_struct *tty, struct file *filp);
 511 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
 512 extern void tty_port_close(struct tty_port *port,
 513                                 struct tty_struct *tty, struct file *filp);
 514 extern int tty_port_open(struct tty_port *port,
 515                                 struct tty_struct *tty, struct file *filp);
 516 static inline int tty_port_users(struct tty_port *port)
 517 {
 518         return port->count + port->blocked_open;
 519 }
 520
 521 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
 522 extern int tty_unregister_ldisc(int disc);
 523 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
 524 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
 525 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
 526 extern void tty_ldisc_init(struct tty_struct *tty);
 527 extern void tty_ldisc_begin(void);
 528 /* This last one is just for the tty layer internals and shouldn't be used elsewhere */
 529 extern void tty_ldisc_enable(struct tty_struct *tty);
 530
 531
 532 /* n_tty.c */
 533 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
 534 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
 535
 536 /* tty_audit.c */
 537 #ifdef CONFIG_AUDIT
 538 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
 539                                size_t size);
 540 extern void tty_audit_exit(void);
 541 extern void tty_audit_fork(struct signal_struct *sig);
 542 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
 543 extern void tty_audit_push(struct tty_struct *tty);
 544 extern int tty_audit_push_task(struct task_struct *tsk,
 545                                uid_t loginuid, u32 sessionid);
 546 #else
 547 static inline void tty_audit_add_data(struct tty_struct *tty,
 548                                       unsigned char *data, size_t size)
 549 {
 550 }
 551 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
 552 {
 553 }
 554 static inline void tty_audit_exit(void)
 555 {
 556 }
 557 static inline void tty_audit_fork(struct signal_struct *sig)
 558 {
 559 }
 560 static inline void tty_audit_push(struct tty_struct *tty)
 561 {
 562 }
 563 static inline int tty_audit_push_task(struct task_struct *tsk,
 564                                       uid_t loginuid, u32 sessionid)
 565 {
 566         return 0;
 567 }
 568 #endif
 569
 570 /* tty_io.c */
 571 extern int __init tty_init(void);
 572
 573 /* tty_ioctl.c */
 574 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
 575                        unsigned int cmd, unsigned long arg);
 576
 577 /* serial.c */
 578
 579 extern void serial_console_init(void);
 580
 581 /* pcxx.c */
 582
 583 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
 584
 585 /* vt.c */
 586
 587 extern int vt_ioctl(struct tty_struct *tty, struct file *file,
 588                     unsigned int cmd, unsigned long arg);
 589
 590 extern long vt_compat_ioctl(struct tty_struct *tty, struct file * file,
 591                      unsigned int cmd, unsigned long arg);
 592
 593 /* tty_mutex.c */
 594 /* functions for preparation of BKL removal */
 595 extern void __lockfunc tty_lock(void) __acquires(tty_lock);
 596 extern void __lockfunc tty_unlock(void) __releases(tty_lock);
 597 extern struct task_struct *__big_tty_mutex_owner;
 598 #define tty_locked()            (current == __big_tty_mutex_owner)
 599
 600 /*
 601  * wait_event_interruptible_tty -- wait for a condition with the tty lock held
 602  *
 603  * The condition we are waiting for might take a long time to
 604  * become true, or might depend on another thread taking the
 605  * BTM. In either case, we need to drop the BTM to guarantee
 606  * forward progress. This is a leftover from the conversion
 607  * from the BKL and should eventually get removed as the BTM
 608  * falls out of use.
 609  *
 610  * Do not use in new code.
 611  */
 612 #define wait_event_interruptible_tty(wq, condition)                     \
 613 ({                                                                      \
 614         int __ret = 0;                                                  \
 615         if (!(condition)) {                                             \
 616                 __wait_event_interruptible_tty(wq, condition, __ret);   \
 617         }                                                               \
 618         __ret;                                                          \
 619 })
 620
 621 #define __wait_event_interruptible_tty(wq, condition, ret)              \
 622 do {                                                                    \
 623         DEFINE_WAIT(__wait);                                            \
 624                                                                         \
 625         for (;;) {                                                      \
 626                 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);      \
 627                 if (condition)                                          \
 628                         break;                                          \
 629                 if (!signal_pending(current)) {                         \
 630                         tty_unlock();                                   \
 631                         schedule();                                     \
 632                         tty_lock();                                     \
 633                         continue;                                       \
 634                 }                                                       \
 635                 ret = -ERESTARTSYS;                                     \
 636                 break;                                                  \
 637         }                                                               \
 638         finish_wait(&wq, &__wait);                                      \
 639 } while (0)
 640
 641
 642 #endif /* __KERNEL__ */
 643 #endif