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 #define N_TRACESINK     23      /* Trace data routing for MIPI P1149.7 */
  54 #define N_TRACEROUTER   24      /* Trace data routing for MIPI P1149.7 */
  55
  56 /*
  57  * This character is the same as _POSIX_VDISABLE: it cannot be used as
  58  * a c_cc[] character, but indicates that a particular special character
  59  * isn't in use (eg VINTR has no character etc)
  60  */
  61 #define __DISABLED_CHAR '\0'
  62
  63 struct tty_buffer {
  64         struct tty_buffer *next;
  65         char *char_buf_ptr;
  66         unsigned char *flag_buf_ptr;
  67         int used;
  68         int size;
  69         int commit;
  70         int read;
  71         /* Data points here */
  72         unsigned long data[0];
  73 };
  74
  75 /*
  76  * We default to dicing tty buffer allocations to this many characters
  77  * in order to avoid multiple page allocations. We know the size of
  78  * tty_buffer itself but it must also be taken into account that the
  79  * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
  80  * logic this must match
  81  */
  82
  83 #define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
  84
  85
  86 struct tty_bufhead {
  87         struct work_struct work;
  88         spinlock_t lock;
  89         struct tty_buffer *head;        /* Queue head */
  90         struct tty_buffer *tail;        /* Active buffer */
  91         struct tty_buffer *free;        /* Free queue head */
  92         int memory_used;                /* Buffer space used excluding
  93                                                                 free queue */
  94 };
  95 /*
  96  * When a break, frame error, or parity error happens, these codes are
  97  * stuffed into the flags buffer.
  98  */
  99 #define TTY_NORMAL      0
 100 #define TTY_BREAK       1
 101 #define TTY_FRAME       2
 102 #define TTY_PARITY      3
 103 #define TTY_OVERRUN     4
 104
 105 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
 106 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
 107 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
 108 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
 109 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
 110 #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
 111 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
 112 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
 113 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
 114 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
 115 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
 116 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
 117 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
 118 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
 119 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
 120 #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
 121 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
 122
 123 #define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f))
 124 #define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f))
 125 #define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f))
 126 #define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f))
 127
 128 #define I_IGNBRK(tty)   _I_FLAG((tty), IGNBRK)
 129 #define I_BRKINT(tty)   _I_FLAG((tty), BRKINT)
 130 #define I_IGNPAR(tty)   _I_FLAG((tty), IGNPAR)
 131 #define I_PARMRK(tty)   _I_FLAG((tty), PARMRK)
 132 #define I_INPCK(tty)    _I_FLAG((tty), INPCK)
 133 #define I_ISTRIP(tty)   _I_FLAG((tty), ISTRIP)
 134 #define I_INLCR(tty)    _I_FLAG((tty), INLCR)
 135 #define I_IGNCR(tty)    _I_FLAG((tty), IGNCR)
 136 #define I_ICRNL(tty)    _I_FLAG((tty), ICRNL)
 137 #define I_IUCLC(tty)    _I_FLAG((tty), IUCLC)
 138 #define I_IXON(tty)     _I_FLAG((tty), IXON)
 139 #define I_IXANY(tty)    _I_FLAG((tty), IXANY)
 140 #define I_IXOFF(tty)    _I_FLAG((tty), IXOFF)
 141 #define I_IMAXBEL(tty)  _I_FLAG((tty), IMAXBEL)
 142 #define I_IUTF8(tty)    _I_FLAG((tty), IUTF8)
 143
 144 #define O_OPOST(tty)    _O_FLAG((tty), OPOST)
 145 #define O_OLCUC(tty)    _O_FLAG((tty), OLCUC)
 146 #define O_ONLCR(tty)    _O_FLAG((tty), ONLCR)
 147 #define O_OCRNL(tty)    _O_FLAG((tty), OCRNL)
 148 #define O_ONOCR(tty)    _O_FLAG((tty), ONOCR)
 149 #define O_ONLRET(tty)   _O_FLAG((tty), ONLRET)
 150 #define O_OFILL(tty)    _O_FLAG((tty), OFILL)
 151 #define O_OFDEL(tty)    _O_FLAG((tty), OFDEL)
 152 #define O_NLDLY(tty)    _O_FLAG((tty), NLDLY)
 153 #define O_CRDLY(tty)    _O_FLAG((tty), CRDLY)
 154 #define O_TABDLY(tty)   _O_FLAG((tty), TABDLY)
 155 #define O_BSDLY(tty)    _O_FLAG((tty), BSDLY)
 156 #define O_VTDLY(tty)    _O_FLAG((tty), VTDLY)
 157 #define O_FFDLY(tty)    _O_FLAG((tty), FFDLY)
 158
 159 #define C_BAUD(tty)     _C_FLAG((tty), CBAUD)
 160 #define C_CSIZE(tty)    _C_FLAG((tty), CSIZE)
 161 #define C_CSTOPB(tty)   _C_FLAG((tty), CSTOPB)
 162 #define C_CREAD(tty)    _C_FLAG((tty), CREAD)
 163 #define C_PARENB(tty)   _C_FLAG((tty), PARENB)
 164 #define C_PARODD(tty)   _C_FLAG((tty), PARODD)
 165 #define C_HUPCL(tty)    _C_FLAG((tty), HUPCL)
 166 #define C_CLOCAL(tty)   _C_FLAG((tty), CLOCAL)
 167 #define C_CIBAUD(tty)   _C_FLAG((tty), CIBAUD)
 168 #define C_CRTSCTS(tty)  _C_FLAG((tty), CRTSCTS)
 169
 170 #define L_ISIG(tty)     _L_FLAG((tty), ISIG)
 171 #define L_ICANON(tty)   _L_FLAG((tty), ICANON)
 172 #define L_XCASE(tty)    _L_FLAG((tty), XCASE)
 173 #define L_ECHO(tty)     _L_FLAG((tty), ECHO)
 174 #define L_ECHOE(tty)    _L_FLAG((tty), ECHOE)
 175 #define L_ECHOK(tty)    _L_FLAG((tty), ECHOK)
 176 #define L_ECHONL(tty)   _L_FLAG((tty), ECHONL)
 177 #define L_NOFLSH(tty)   _L_FLAG((tty), NOFLSH)
 178 #define L_TOSTOP(tty)   _L_FLAG((tty), TOSTOP)
 179 #define L_ECHOCTL(tty)  _L_FLAG((tty), ECHOCTL)
 180 #define L_ECHOPRT(tty)  _L_FLAG((tty), ECHOPRT)
 181 #define L_ECHOKE(tty)   _L_FLAG((tty), ECHOKE)
 182 #define L_FLUSHO(tty)   _L_FLAG((tty), FLUSHO)
 183 #define L_PENDIN(tty)   _L_FLAG((tty), PENDIN)
 184 #define L_IEXTEN(tty)   _L_FLAG((tty), IEXTEN)
 185 #define L_EXTPROC(tty)  _L_FLAG((tty), EXTPROC)
 186
 187 struct device;
 188 struct signal_struct;
 189
 190 /*
 191  * Port level information. Each device keeps its own port level information
 192  * so provide a common structure for those ports wanting to use common support
 193  * routines.
 194  *
 195  * The tty port has a different lifetime to the tty so must be kept apart.
 196  * In addition be careful as tty -> port mappings are valid for the life
 197  * of the tty object but in many cases port -> tty mappings are valid only
 198  * until a hangup so don't use the wrong path.
 199  */
 200
 201 struct tty_port;
 202
 203 struct tty_port_operations {
 204         /* Return 1 if the carrier is raised */
 205         int (*carrier_raised)(struct tty_port *port);
 206         /* Control the DTR line */
 207         void (*dtr_rts)(struct tty_port *port, int raise);
 208         /* Called when the last close completes or a hangup finishes
 209            IFF the port was initialized. Do not use to free resources. Called
 210            under the port mutex to serialize against activate/shutdowns */
 211         void (*shutdown)(struct tty_port *port);
 212         void (*drop)(struct tty_port *port);
 213         /* Called under the port mutex from tty_port_open, serialized using
 214            the port mutex */
 215         /* FIXME: long term getting the tty argument *out* of this would be
 216            good for consoles */
 217         int (*activate)(struct tty_port *port, struct tty_struct *tty);
 218         /* Called on the final put of a port */
 219         void (*destruct)(struct tty_port *port);
 220 };
 221
 222 struct tty_port {
 223         struct tty_struct       *tty;           /* Back pointer */
 224         const struct tty_port_operations *ops;  /* Port operations */
 225         spinlock_t              lock;           /* Lock protecting tty field */
 226         int                     blocked_open;   /* Waiting to open */
 227         int                     count;          /* Usage count */
 228         wait_queue_head_t       open_wait;      /* Open waiters */
 229         wait_queue_head_t       close_wait;     /* Close waiters */
 230         wait_queue_head_t       delta_msr_wait; /* Modem status change */
 231         unsigned long           flags;          /* TTY flags ASY_*/
 232         unsigned char           console:1;      /* port is a console */
 233         struct mutex            mutex;          /* Locking */
 234         struct mutex            buf_mutex;      /* Buffer alloc lock */
 235         unsigned char           *xmit_buf;      /* Optional buffer */
 236         unsigned int            close_delay;    /* Close port delay */
 237         unsigned int            closing_wait;   /* Delay for output */
 238         int                     drain_delay;    /* Set to zero if no pure time
 239                                                    based drain is needed else
 240                                                    set to size of fifo */
 241         struct kref             kref;           /* Ref counter */
 242 };
 243
 244 /*
 245  * Where all of the state associated with a tty is kept while the tty
 246  * is open.  Since the termios state should be kept even if the tty
 247  * has been closed --- for things like the baud rate, etc --- it is
 248  * not stored here, but rather a pointer to the real state is stored
 249  * here.  Possible the winsize structure should have the same
 250  * treatment, but (1) the default 80x24 is usually right and (2) it's
 251  * most often used by a windowing system, which will set the correct
 252  * size each time the window is created or resized anyway.
 253  *                                              - TYT, 9/14/92
 254  */
 255
 256 struct tty_operations;
 257
 258 struct tty_struct {
 259         int     magic;
 260         struct kref kref;
 261         struct device *dev;
 262         struct tty_driver *driver;
 263         const struct tty_operations *ops;
 264         int index;
 265
 266         /* Protects ldisc changes: Lock tty not pty */
 267         struct mutex ldisc_mutex;
 268         struct tty_ldisc *ldisc;
 269
 270         struct mutex termios_mutex;
 271         spinlock_t ctrl_lock;
 272         /* Termios values are protected by the termios mutex */
 273         struct ktermios *termios, *termios_locked;
 274         struct termiox *termiox;        /* May be NULL for unsupported */
 275         char name[64];
 276         struct pid *pgrp;               /* Protected by ctrl lock */
 277         struct pid *session;
 278         unsigned long flags;
 279         int count;
 280         struct winsize winsize;         /* termios mutex */
 281         unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
 282         unsigned char low_latency:1, warned:1;
 283         unsigned char ctrl_status;      /* ctrl_lock */
 284         unsigned int receive_room;      /* Bytes free for queue */
 285
 286         struct tty_struct *link;
 287         struct fasync_struct *fasync;
 288         struct tty_bufhead buf;         /* Locked internally */
 289         int alt_speed;          /* For magic substitution of 38400 bps */
 290         wait_queue_head_t write_wait;
 291         wait_queue_head_t read_wait;
 292         struct work_struct hangup_work;
 293         void *disc_data;
 294         void *driver_data;
 295         struct list_head tty_files;
 296
 297 #define N_TTY_BUF_SIZE 4096
 298
 299         /*
 300          * The following is data for the N_TTY line discipline.  For
 301          * historical reasons, this is included in the tty structure.
 302          * Mostly locked by the BKL.
 303          */
 304         unsigned int column;
 305         unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
 306         unsigned char closing:1;
 307         unsigned char echo_overrun:1;
 308         unsigned short minimum_to_wake;
 309         unsigned long overrun_time;
 310         int num_overrun;
 311         unsigned long process_char_map[256/(8*sizeof(unsigned long))];
 312         char *read_buf;
 313         int read_head;
 314         int read_tail;
 315         int read_cnt;
 316         unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
 317         unsigned char *echo_buf;
 318         unsigned int echo_pos;
 319         unsigned int echo_cnt;
 320         int canon_data;
 321         unsigned long canon_head;
 322         unsigned int canon_column;
 323         struct mutex atomic_read_lock;
 324         struct mutex atomic_write_lock;
 325         struct mutex output_lock;
 326         struct mutex echo_lock;
 327         unsigned char *write_buf;
 328         int write_cnt;
 329         spinlock_t read_lock;
 330         /* If the tty has a pending do_SAK, queue it here - akpm */
 331         struct work_struct SAK_work;
 332         struct tty_port *port;
 333 };
 334
 335 /* Each of a tty's open files has private_data pointing to tty_file_private */
 336 struct tty_file_private {
 337         struct tty_struct *tty;
 338         struct file *file;
 339         struct list_head list;
 340 };
 341
 342 /* tty magic number */
 343 #define TTY_MAGIC               0x5401
 344
 345 /*
 346  * These bits are used in the flags field of the tty structure.
 347  *
 348  * So that interrupts won't be able to mess up the queues,
 349  * copy_to_cooked must be atomic with respect to itself, as must
 350  * tty->write.  Thus, you must use the inline functions set_bit() and
 351  * clear_bit() to make things atomic.
 352  */
 353 #define TTY_THROTTLED           0       /* Call unthrottle() at threshold min */
 354 #define TTY_IO_ERROR            1       /* Cause an I/O error (may be no ldisc too) */
 355 #define TTY_OTHER_CLOSED        2       /* Other side (if any) has closed */
 356 #define TTY_EXCLUSIVE           3       /* Exclusive open mode */
 357 #define TTY_DEBUG               4       /* Debugging */
 358 #define TTY_DO_WRITE_WAKEUP     5       /* Call write_wakeup after queuing new */
 359 #define TTY_PUSH                6       /* n_tty private */
 360 #define TTY_CLOSING             7       /* ->close() in progress */
 361 #define TTY_LDISC               9       /* Line discipline attached */
 362 #define TTY_LDISC_CHANGING      10      /* Line discipline changing */
 363 #define TTY_LDISC_OPEN          11      /* Line discipline is open */
 364 #define TTY_HW_COOK_OUT         14      /* Hardware can do output cooking */
 365 #define TTY_HW_COOK_IN          15      /* Hardware can do input cooking */
 366 #define TTY_PTY_LOCK            16      /* pty private */
 367 #define TTY_NO_WRITE_SPLIT      17      /* Preserve write boundaries to driver */
 368 #define TTY_HUPPED              18      /* Post driver->hangup() */
 369 #define TTY_FLUSHING            19      /* Flushing to ldisc in progress */
 370 #define TTY_FLUSHPENDING        20      /* Queued buffer flush pending */
 371 #define TTY_HUPPING             21      /* ->hangup() in progress */
 372
 373 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
 374
 375 extern void tty_write_flush(struct tty_struct *);
 376
 377 extern struct ktermios tty_std_termios;
 378
 379 extern void console_init(void);
 380 extern int vcs_init(void);
 381
 382 extern struct class *tty_class;
 383
 384 /**
 385  *      tty_kref_get            -       get a tty reference
 386  *      @tty: tty device
 387  *
 388  *      Return a new reference to a tty object. The caller must hold
 389  *      sufficient locks/counts to ensure that their existing reference cannot
 390  *      go away
 391  */
 392
 393 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
 394 {
 395         if (tty)
 396                 kref_get(&tty->kref);
 397         return tty;
 398 }
 399 extern void tty_kref_put(struct tty_struct *tty);
 400
 401 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
 402                               const char *routine);
 403 extern char *tty_name(struct tty_struct *tty, char *buf);
 404 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
 405 extern int tty_check_change(struct tty_struct *tty);
 406 extern void stop_tty(struct tty_struct *tty);
 407 extern void start_tty(struct tty_struct *tty);
 408 extern int tty_register_driver(struct tty_driver *driver);
 409 extern int tty_unregister_driver(struct tty_driver *driver);
 410 extern struct device *tty_register_device(struct tty_driver *driver,
 411                                           unsigned index, struct device *dev);
 412 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
 413 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
 414                              int buflen);
 415 extern void tty_write_message(struct tty_struct *tty, char *msg);
 416 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
 417 extern int tty_chars_in_buffer(struct tty_struct *tty);
 418 extern int tty_write_room(struct tty_struct *tty);
 419 extern void tty_driver_flush_buffer(struct tty_struct *tty);
 420 extern void tty_throttle(struct tty_struct *tty);
 421 extern void tty_unthrottle(struct tty_struct *tty);
 422 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
 423 extern void tty_shutdown(struct tty_struct *tty);
 424 extern void tty_free_termios(struct tty_struct *tty);
 425 extern int is_current_pgrp_orphaned(void);
 426 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
 427 extern int is_ignored(int sig);
 428 extern int tty_signal(int sig, struct tty_struct *tty);
 429 extern void tty_hangup(struct tty_struct *tty);
 430 extern void tty_vhangup(struct tty_struct *tty);
 431 extern void tty_vhangup_locked(struct tty_struct *tty);
 432 extern void tty_vhangup_self(void);
 433 extern void tty_unhangup(struct file *filp);
 434 extern int tty_hung_up_p(struct file *filp);
 435 extern void do_SAK(struct tty_struct *tty);
 436 extern void __do_SAK(struct tty_struct *tty);
 437 extern void disassociate_ctty(int priv);
 438 extern void no_tty(void);
 439 extern void tty_flip_buffer_push(struct tty_struct *tty);
 440 extern void tty_flush_to_ldisc(struct tty_struct *tty);
 441 extern void tty_buffer_free_all(struct tty_struct *tty);
 442 extern void tty_buffer_flush(struct tty_struct *tty);
 443 extern void tty_buffer_init(struct tty_struct *tty);
 444 extern speed_t tty_get_baud_rate(struct tty_struct *tty);
 445 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
 446 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
 447 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
 448                                                 speed_t ibaud, speed_t obaud);
 449 extern void tty_encode_baud_rate(struct tty_struct *tty,
 450                                                 speed_t ibaud, speed_t obaud);
 451 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
 452 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
 453 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
 454
 455 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
 456 extern void tty_ldisc_deref(struct tty_ldisc *);
 457 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
 458 extern void tty_ldisc_hangup(struct tty_struct *tty);
 459 extern const struct file_operations tty_ldiscs_proc_fops;
 460
 461 extern void tty_wakeup(struct tty_struct *tty);
 462 extern void tty_ldisc_flush(struct tty_struct *tty);
 463
 464 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 465 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
 466                         unsigned int cmd, unsigned long arg);
 467 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
 468 extern dev_t tty_devnum(struct tty_struct *tty);
 469 extern void proc_clear_tty(struct task_struct *p);
 470 extern struct tty_struct *get_current_tty(void);
 471 extern void tty_default_fops(struct file_operations *fops);
 472 extern struct tty_struct *alloc_tty_struct(void);
 473 extern int tty_add_file(struct tty_struct *tty, struct file *file);
 474 extern void free_tty_struct(struct tty_struct *tty);
 475 extern void initialize_tty_struct(struct tty_struct *tty,
 476                 struct tty_driver *driver, int idx);
 477 extern void deinitialize_tty_struct(struct tty_struct *tty);
 478 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
 479                                                                 int first_ok);
 480 extern int tty_release(struct inode *inode, struct file *filp);
 481 extern int tty_init_termios(struct tty_struct *tty);
 482
 483 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
 484 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
 485
 486 extern struct mutex tty_mutex;
 487 extern spinlock_t tty_files_lock;
 488
 489 extern void tty_write_unlock(struct tty_struct *tty);
 490 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
 491 #define tty_is_writelocked(tty)  (mutex_is_locked(&tty->atomic_write_lock))
 492
 493 extern void tty_port_init(struct tty_port *port);
 494 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
 495 extern void tty_port_free_xmit_buf(struct tty_port *port);
 496 extern void tty_port_put(struct tty_port *port);
 497
 498 static inline struct tty_port *tty_port_get(struct tty_port *port)
 499 {
 500         if (port)
 501                 kref_get(&port->kref);
 502         return port;
 503 }
 504
 505 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
 506 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
 507 extern int tty_port_carrier_raised(struct tty_port *port);
 508 extern void tty_port_raise_dtr_rts(struct tty_port *port);
 509 extern void tty_port_lower_dtr_rts(struct tty_port *port);
 510 extern void tty_port_hangup(struct tty_port *port);
 511 extern int tty_port_block_til_ready(struct tty_port *port,
 512                                 struct tty_struct *tty, struct file *filp);
 513 extern int tty_port_close_start(struct tty_port *port,
 514                                 struct tty_struct *tty, struct file *filp);
 515 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
 516 extern void tty_port_close(struct tty_port *port,
 517                                 struct tty_struct *tty, struct file *filp);
 518 extern int tty_port_open(struct tty_port *port,
 519                                 struct tty_struct *tty, struct file *filp);
 520 static inline int tty_port_users(struct tty_port *port)
 521 {
 522         return port->count + port->blocked_open;
 523 }
 524
 525 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
 526 extern int tty_unregister_ldisc(int disc);
 527 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
 528 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
 529 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
 530 extern void tty_ldisc_init(struct tty_struct *tty);
 531 extern void tty_ldisc_deinit(struct tty_struct *tty);
 532 extern void tty_ldisc_begin(void);
 533 /* This last one is just for the tty layer internals and shouldn't be used elsewhere */
 534 extern void tty_ldisc_enable(struct tty_struct *tty);
 535
 536
 537 /* n_tty.c */
 538 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
 539 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
 540
 541 /* tty_audit.c */
 542 #ifdef CONFIG_AUDIT
 543 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
 544                                size_t size);
 545 extern void tty_audit_exit(void);
 546 extern void tty_audit_fork(struct signal_struct *sig);
 547 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
 548 extern void tty_audit_push(struct tty_struct *tty);
 549 extern int tty_audit_push_task(struct task_struct *tsk,
 550                                uid_t loginuid, u32 sessionid);
 551 #else
 552 static inline void tty_audit_add_data(struct tty_struct *tty,
 553                                       unsigned char *data, size_t size)
 554 {
 555 }
 556 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
 557 {
 558 }
 559 static inline void tty_audit_exit(void)
 560 {
 561 }
 562 static inline void tty_audit_fork(struct signal_struct *sig)
 563 {
 564 }
 565 static inline void tty_audit_push(struct tty_struct *tty)
 566 {
 567 }
 568 static inline int tty_audit_push_task(struct task_struct *tsk,
 569                                       uid_t loginuid, u32 sessionid)
 570 {
 571         return 0;
 572 }
 573 #endif
 574
 575 /* tty_io.c */
 576 extern int __init tty_init(void);
 577
 578 /* tty_ioctl.c */
 579 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
 580                        unsigned int cmd, unsigned long arg);
 581
 582 /* serial.c */
 583
 584 extern void serial_console_init(void);
 585
 586 /* pcxx.c */
 587
 588 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
 589
 590 /* vt.c */
 591
 592 extern int vt_ioctl(struct tty_struct *tty,
 593                     unsigned int cmd, unsigned long arg);
 594
 595 extern long vt_compat_ioctl(struct tty_struct *tty,
 596                      unsigned int cmd, unsigned long arg);
 597
 598 /* tty_mutex.c */
 599 /* functions for preparation of BKL removal */
 600 extern void __lockfunc tty_lock(void) __acquires(tty_lock);
 601 extern void __lockfunc tty_unlock(void) __releases(tty_lock);
 602 extern struct task_struct *__big_tty_mutex_owner;
 603 #define tty_locked()            (current == __big_tty_mutex_owner)
 604
 605 /*
 606  * wait_event_interruptible_tty -- wait for a condition with the tty lock held
 607  *
 608  * The condition we are waiting for might take a long time to
 609  * become true, or might depend on another thread taking the
 610  * BTM. In either case, we need to drop the BTM to guarantee
 611  * forward progress. This is a leftover from the conversion
 612  * from the BKL and should eventually get removed as the BTM
 613  * falls out of use.
 614  *
 615  * Do not use in new code.
 616  */
 617 #define wait_event_interruptible_tty(wq, condition)                     \
 618 ({                                                                      \
 619         int __ret = 0;                                                  \
 620         if (!(condition)) {                                             \
 621                 __wait_event_interruptible_tty(wq, condition, __ret);   \
 622         }                                                               \
 623         __ret;                                                          \
 624 })
 625
 626 #define __wait_event_interruptible_tty(wq, condition, ret)              \
 627 do {                                                                    \
 628         DEFINE_WAIT(__wait);                                            \
 629                                                                         \
 630         for (;;) {                                                      \
 631                 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);      \
 632                 if (condition)                                          \
 633                         break;                                          \
 634                 if (!signal_pending(current)) {                         \
 635                         tty_unlock();                                   \
 636                         schedule();                                     \
 637                         tty_lock();                                     \
 638                         continue;                                       \
 639                 }                                                       \
 640                 ret = -ERESTARTSYS;                                     \
 641                 break;                                                  \
 642         }                                                               \
 643         finish_wait(&wq, &__wait);                                      \
 644 } while (0)
 645
 646
 647 #endif /* __KERNEL__ */
 648 #endif