linux/include/linux/tty.h
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   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#define NR_LDISCS               30
   9
  10/* line disciplines */
  11#define N_TTY           0
  12#define N_SLIP          1
  13#define N_MOUSE         2
  14#define N_PPP           3
  15#define N_STRIP         4
  16#define N_AX25          5
  17#define N_X25           6       /* X.25 async */
  18#define N_6PACK         7
  19#define N_MASC          8       /* Reserved for Mobitex module <kaz@cafe.net> */
  20#define N_R3964         9       /* Reserved for Simatic R3964 module */
  21#define N_PROFIBUS_FDL  10      /* Reserved for Profibus */
  22#define N_IRDA          11      /* Linux IrDa - http://irda.sourceforge.net/ */
  23#define N_SMSBLOCK      12      /* SMS block mode - for talking to GSM data */
  24                                /* cards about SMS messages */
  25#define N_HDLC          13      /* synchronous HDLC */
  26#define N_SYNC_PPP      14      /* synchronous PPP */
  27#define N_HCI           15      /* Bluetooth HCI UART */
  28#define N_GIGASET_M101  16      /* Siemens Gigaset M101 serial DECT adapter */
  29#define N_SLCAN         17      /* Serial / USB serial CAN Adaptors */
  30#define N_PPS           18      /* Pulse per Second */
  31#define N_V253          19      /* Codec control over voice modem */
  32#define N_CAIF          20      /* CAIF protocol for talking to modems */
  33#define N_GSM0710       21      /* GSM 0710 Mux */
  34#define N_TI_WL         22      /* for TI's WL BT, FM, GPS combo chips */
  35#define N_TRACESINK     23      /* Trace data routing for MIPI P1149.7 */
  36#define N_TRACEROUTER   24      /* Trace data routing for MIPI P1149.7 */
  37
  38#ifdef __KERNEL__
  39#include <linux/fs.h>
  40#include <linux/major.h>
  41#include <linux/termios.h>
  42#include <linux/workqueue.h>
  43#include <linux/tty_driver.h>
  44#include <linux/tty_ldisc.h>
  45#include <linux/mutex.h>
  46
  47
  48
  49/*
  50 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
  51 * hardcoded at present.)
  52 */
  53#define NR_UNIX98_PTY_DEFAULT   4096      /* Default maximum for Unix98 ptys */
  54#define NR_UNIX98_PTY_RESERVE   1024      /* Default reserve for main devpts */
  55#define NR_UNIX98_PTY_MAX       (1 << MINORBITS) /* Absolute limit */
  56
  57/*
  58 * This character is the same as _POSIX_VDISABLE: it cannot be used as
  59 * a c_cc[] character, but indicates that a particular special character
  60 * isn't in use (eg VINTR has no character etc)
  61 */
  62#define __DISABLED_CHAR '\0'
  63
  64struct tty_buffer {
  65        struct tty_buffer *next;
  66        char *char_buf_ptr;
  67        unsigned char *flag_buf_ptr;
  68        int used;
  69        int size;
  70        int commit;
  71        int read;
  72        /* Data points here */
  73        unsigned long data[0];
  74};
  75
  76/*
  77 * We default to dicing tty buffer allocations to this many characters
  78 * in order to avoid multiple page allocations. We know the size of
  79 * tty_buffer itself but it must also be taken into account that the
  80 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
  81 * logic this must match
  82 */
  83
  84#define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
  85
  86
  87struct tty_bufhead {
  88        struct work_struct work;
  89        spinlock_t lock;
  90        struct tty_buffer *head;        /* Queue head */
  91        struct tty_buffer *tail;        /* Active buffer */
  92        struct tty_buffer *free;        /* Free queue head */
  93        int memory_used;                /* Buffer space used excluding
  94                                                                free queue */
  95};
  96/*
  97 * When a break, frame error, or parity error happens, these codes are
  98 * stuffed into the flags buffer.
  99 */
 100#define TTY_NORMAL      0
 101#define TTY_BREAK       1
 102#define TTY_FRAME       2
 103#define TTY_PARITY      3
 104#define TTY_OVERRUN     4
 105
 106#define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
 107#define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
 108#define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
 109#define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
 110#define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
 111#define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
 112#define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
 113#define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
 114#define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
 115#define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
 116#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
 117#define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
 118#define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
 119#define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
 120#define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
 121#define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
 122#define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
 123
 124#define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f))
 125#define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f))
 126#define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f))
 127#define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f))
 128
 129#define I_IGNBRK(tty)   _I_FLAG((tty), IGNBRK)
 130#define I_BRKINT(tty)   _I_FLAG((tty), BRKINT)
 131#define I_IGNPAR(tty)   _I_FLAG((tty), IGNPAR)
 132#define I_PARMRK(tty)   _I_FLAG((tty), PARMRK)
 133#define I_INPCK(tty)    _I_FLAG((tty), INPCK)
 134#define I_ISTRIP(tty)   _I_FLAG((tty), ISTRIP)
 135#define I_INLCR(tty)    _I_FLAG((tty), INLCR)
 136#define I_IGNCR(tty)    _I_FLAG((tty), IGNCR)
 137#define I_ICRNL(tty)    _I_FLAG((tty), ICRNL)
 138#define I_IUCLC(tty)    _I_FLAG((tty), IUCLC)
 139#define I_IXON(tty)     _I_FLAG((tty), IXON)
 140#define I_IXANY(tty)    _I_FLAG((tty), IXANY)
 141#define I_IXOFF(tty)    _I_FLAG((tty), IXOFF)
 142#define I_IMAXBEL(tty)  _I_FLAG((tty), IMAXBEL)
 143#define I_IUTF8(tty)    _I_FLAG((tty), IUTF8)
 144
 145#define O_OPOST(tty)    _O_FLAG((tty), OPOST)
 146#define O_OLCUC(tty)    _O_FLAG((tty), OLCUC)
 147#define O_ONLCR(tty)    _O_FLAG((tty), ONLCR)
 148#define O_OCRNL(tty)    _O_FLAG((tty), OCRNL)
 149#define O_ONOCR(tty)    _O_FLAG((tty), ONOCR)
 150#define O_ONLRET(tty)   _O_FLAG((tty), ONLRET)
 151#define O_OFILL(tty)    _O_FLAG((tty), OFILL)
 152#define O_OFDEL(tty)    _O_FLAG((tty), OFDEL)
 153#define O_NLDLY(tty)    _O_FLAG((tty), NLDLY)
 154#define O_CRDLY(tty)    _O_FLAG((tty), CRDLY)
 155#define O_TABDLY(tty)   _O_FLAG((tty), TABDLY)
 156#define O_BSDLY(tty)    _O_FLAG((tty), BSDLY)
 157#define O_VTDLY(tty)    _O_FLAG((tty), VTDLY)
 158#define O_FFDLY(tty)    _O_FLAG((tty), FFDLY)
 159
 160#define C_BAUD(tty)     _C_FLAG((tty), CBAUD)
 161#define C_CSIZE(tty)    _C_FLAG((tty), CSIZE)
 162#define C_CSTOPB(tty)   _C_FLAG((tty), CSTOPB)
 163#define C_CREAD(tty)    _C_FLAG((tty), CREAD)
 164#define C_PARENB(tty)   _C_FLAG((tty), PARENB)
 165#define C_PARODD(tty)   _C_FLAG((tty), PARODD)
 166#define C_HUPCL(tty)    _C_FLAG((tty), HUPCL)
 167#define C_CLOCAL(tty)   _C_FLAG((tty), CLOCAL)
 168#define C_CIBAUD(tty)   _C_FLAG((tty), CIBAUD)
 169#define C_CRTSCTS(tty)  _C_FLAG((tty), CRTSCTS)
 170
 171#define L_ISIG(tty)     _L_FLAG((tty), ISIG)
 172#define L_ICANON(tty)   _L_FLAG((tty), ICANON)
 173#define L_XCASE(tty)    _L_FLAG((tty), XCASE)
 174#define L_ECHO(tty)     _L_FLAG((tty), ECHO)
 175#define L_ECHOE(tty)    _L_FLAG((tty), ECHOE)
 176#define L_ECHOK(tty)    _L_FLAG((tty), ECHOK)
 177#define L_ECHONL(tty)   _L_FLAG((tty), ECHONL)
 178#define L_NOFLSH(tty)   _L_FLAG((tty), NOFLSH)
 179#define L_TOSTOP(tty)   _L_FLAG((tty), TOSTOP)
 180#define L_ECHOCTL(tty)  _L_FLAG((tty), ECHOCTL)
 181#define L_ECHOPRT(tty)  _L_FLAG((tty), ECHOPRT)
 182#define L_ECHOKE(tty)   _L_FLAG((tty), ECHOKE)
 183#define L_FLUSHO(tty)   _L_FLAG((tty), FLUSHO)
 184#define L_PENDIN(tty)   _L_FLAG((tty), PENDIN)
 185#define L_IEXTEN(tty)   _L_FLAG((tty), IEXTEN)
 186#define L_EXTPROC(tty)  _L_FLAG((tty), EXTPROC)
 187
 188struct device;
 189struct signal_struct;
 190
 191/*
 192 * Port level information. Each device keeps its own port level information
 193 * so provide a common structure for those ports wanting to use common support
 194 * routines.
 195 *
 196 * The tty port has a different lifetime to the tty so must be kept apart.
 197 * In addition be careful as tty -> port mappings are valid for the life
 198 * of the tty object but in many cases port -> tty mappings are valid only
 199 * until a hangup so don't use the wrong path.
 200 */
 201
 202struct tty_port;
 203
 204struct tty_port_operations {
 205        /* Return 1 if the carrier is raised */
 206        int (*carrier_raised)(struct tty_port *port);
 207        /* Control the DTR line */
 208        void (*dtr_rts)(struct tty_port *port, int raise);
 209        /* Called when the last close completes or a hangup finishes
 210           IFF the port was initialized. Do not use to free resources. Called
 211           under the port mutex to serialize against activate/shutdowns */
 212        void (*shutdown)(struct tty_port *port);
 213        void (*drop)(struct tty_port *port);
 214        /* Called under the port mutex from tty_port_open, serialized using
 215           the port mutex */
 216        /* FIXME: long term getting the tty argument *out* of this would be
 217           good for consoles */
 218        int (*activate)(struct tty_port *port, struct tty_struct *tty);
 219        /* Called on the final put of a port */
 220        void (*destruct)(struct tty_port *port);
 221};
 222        
 223struct tty_port {
 224        struct tty_struct       *tty;           /* Back pointer */
 225        const struct tty_port_operations *ops;  /* Port operations */
 226        spinlock_t              lock;           /* Lock protecting tty field */
 227        int                     blocked_open;   /* Waiting to open */
 228        int                     count;          /* Usage count */
 229        wait_queue_head_t       open_wait;      /* Open waiters */
 230        wait_queue_head_t       close_wait;     /* Close waiters */
 231        wait_queue_head_t       delta_msr_wait; /* Modem status change */
 232        unsigned long           flags;          /* TTY flags ASY_*/
 233        unsigned char           console:1;      /* port is a console */
 234        struct mutex            mutex;          /* Locking */
 235        struct mutex            buf_mutex;      /* Buffer alloc lock */
 236        unsigned char           *xmit_buf;      /* Optional buffer */
 237        unsigned int            close_delay;    /* Close port delay */
 238        unsigned int            closing_wait;   /* Delay for output */
 239        int                     drain_delay;    /* Set to zero if no pure time
 240                                                   based drain is needed else
 241                                                   set to size of fifo */
 242        struct kref             kref;           /* Ref counter */
 243};
 244
 245/*
 246 * Where all of the state associated with a tty is kept while the tty
 247 * is open.  Since the termios state should be kept even if the tty
 248 * has been closed --- for things like the baud rate, etc --- it is
 249 * not stored here, but rather a pointer to the real state is stored
 250 * here.  Possible the winsize structure should have the same
 251 * treatment, but (1) the default 80x24 is usually right and (2) it's
 252 * most often used by a windowing system, which will set the correct
 253 * size each time the window is created or resized anyway.
 254 *                                              - TYT, 9/14/92
 255 */
 256
 257struct tty_operations;
 258
 259struct tty_struct {
 260        int     magic;
 261        struct kref kref;
 262        struct device *dev;
 263        struct tty_driver *driver;
 264        const struct tty_operations *ops;
 265        int index;
 266
 267        /* Protects ldisc changes: Lock tty not pty */
 268        struct mutex ldisc_mutex;
 269        struct tty_ldisc *ldisc;
 270
 271        struct mutex termios_mutex;
 272        spinlock_t ctrl_lock;
 273        /* Termios values are protected by the termios mutex */
 274        struct ktermios *termios, *termios_locked;
 275        struct termiox *termiox;        /* May be NULL for unsupported */
 276        char name[64];
 277        struct pid *pgrp;               /* Protected by ctrl lock */
 278        struct pid *session;
 279        unsigned long flags;
 280        int count;
 281        struct winsize winsize;         /* termios mutex */
 282        unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
 283        unsigned char low_latency:1, warned:1;
 284        unsigned char ctrl_status;      /* ctrl_lock */
 285        unsigned int receive_room;      /* Bytes free for queue */
 286
 287        struct tty_struct *link;
 288        struct fasync_struct *fasync;
 289        struct tty_bufhead buf;         /* Locked internally */
 290        int alt_speed;          /* For magic substitution of 38400 bps */
 291        wait_queue_head_t write_wait;
 292        wait_queue_head_t read_wait;
 293        struct work_struct hangup_work;
 294        void *disc_data;
 295        void *driver_data;
 296        struct list_head tty_files;
 297
 298#define N_TTY_BUF_SIZE 4096
 299
 300        /*
 301         * The following is data for the N_TTY line discipline.  For
 302         * historical reasons, this is included in the tty structure.
 303         * Mostly locked by the BKL.
 304         */
 305        unsigned int column;
 306        unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
 307        unsigned char closing:1;
 308        unsigned char echo_overrun:1;
 309        unsigned short minimum_to_wake;
 310        unsigned long overrun_time;
 311        int num_overrun;
 312        unsigned long process_char_map[256/(8*sizeof(unsigned long))];
 313        char *read_buf;
 314        int read_head;
 315        int read_tail;
 316        int read_cnt;
 317        unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
 318        unsigned char *echo_buf;
 319        unsigned int echo_pos;
 320        unsigned int echo_cnt;
 321        int canon_data;
 322        unsigned long canon_head;
 323        unsigned int canon_column;
 324        struct mutex atomic_read_lock;
 325        struct mutex atomic_write_lock;
 326        struct mutex output_lock;
 327        struct mutex echo_lock;
 328        unsigned char *write_buf;
 329        int write_cnt;
 330        spinlock_t read_lock;
 331        /* If the tty has a pending do_SAK, queue it here - akpm */
 332        struct work_struct SAK_work;
 333        struct tty_port *port;
 334};
 335
 336/* Each of a tty's open files has private_data pointing to tty_file_private */
 337struct tty_file_private {
 338        struct tty_struct *tty;
 339        struct file *file;
 340        struct list_head list;
 341};
 342
 343/* tty magic number */
 344#define TTY_MAGIC               0x5401
 345
 346/*
 347 * These bits are used in the flags field of the tty structure.
 348 *
 349 * So that interrupts won't be able to mess up the queues,
 350 * copy_to_cooked must be atomic with respect to itself, as must
 351 * tty->write.  Thus, you must use the inline functions set_bit() and
 352 * clear_bit() to make things atomic.
 353 */
 354#define TTY_THROTTLED           0       /* Call unthrottle() at threshold min */
 355#define TTY_IO_ERROR            1       /* Cause an I/O error (may be no ldisc too) */
 356#define TTY_OTHER_CLOSED        2       /* Other side (if any) has closed */
 357#define TTY_EXCLUSIVE           3       /* Exclusive open mode */
 358#define TTY_DEBUG               4       /* Debugging */
 359#define TTY_DO_WRITE_WAKEUP     5       /* Call write_wakeup after queuing new */
 360#define TTY_PUSH                6       /* n_tty private */
 361#define TTY_CLOSING             7       /* ->close() in progress */
 362#define TTY_LDISC               9       /* Line discipline attached */
 363#define TTY_LDISC_CHANGING      10      /* Line discipline changing */
 364#define TTY_LDISC_OPEN          11      /* Line discipline is open */
 365#define TTY_HW_COOK_OUT         14      /* Hardware can do output cooking */
 366#define TTY_HW_COOK_IN          15      /* Hardware can do input cooking */
 367#define TTY_PTY_LOCK            16      /* pty private */
 368#define TTY_NO_WRITE_SPLIT      17      /* Preserve write boundaries to driver */
 369#define TTY_HUPPED              18      /* Post driver->hangup() */
 370#define TTY_FLUSHING            19      /* Flushing to ldisc in progress */
 371#define TTY_FLUSHPENDING        20      /* Queued buffer flush pending */
 372#define TTY_HUPPING             21      /* ->hangup() in progress */
 373
 374#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
 375
 376extern void tty_write_flush(struct tty_struct *);
 377
 378extern struct ktermios tty_std_termios;
 379
 380extern void console_init(void);
 381extern int vcs_init(void);
 382
 383extern struct class *tty_class;
 384
 385/**
 386 *      tty_kref_get            -       get a tty reference
 387 *      @tty: tty device
 388 *
 389 *      Return a new reference to a tty object. The caller must hold
 390 *      sufficient locks/counts to ensure that their existing reference cannot
 391 *      go away
 392 */
 393
 394static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
 395{
 396        if (tty)
 397                kref_get(&tty->kref);
 398        return tty;
 399}
 400extern void tty_kref_put(struct tty_struct *tty);
 401
 402extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
 403                              const char *routine);
 404extern char *tty_name(struct tty_struct *tty, char *buf);
 405extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
 406extern int tty_check_change(struct tty_struct *tty);
 407extern void stop_tty(struct tty_struct *tty);
 408extern void start_tty(struct tty_struct *tty);
 409extern int tty_register_driver(struct tty_driver *driver);
 410extern int tty_unregister_driver(struct tty_driver *driver);
 411extern struct device *tty_register_device(struct tty_driver *driver,
 412                                          unsigned index, struct device *dev);
 413extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
 414extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
 415                             int buflen);
 416extern void tty_write_message(struct tty_struct *tty, char *msg);
 417extern int tty_put_char(struct tty_struct *tty, unsigned char c);
 418extern int tty_chars_in_buffer(struct tty_struct *tty);
 419extern int tty_write_room(struct tty_struct *tty);
 420extern void tty_driver_flush_buffer(struct tty_struct *tty);
 421extern void tty_throttle(struct tty_struct *tty);
 422extern void tty_unthrottle(struct tty_struct *tty);
 423extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
 424extern void tty_driver_remove_tty(struct tty_driver *driver,
 425                                  struct tty_struct *tty);
 426extern void tty_shutdown(struct tty_struct *tty);
 427extern void tty_free_termios(struct tty_struct *tty);
 428extern int is_current_pgrp_orphaned(void);
 429extern struct pid *tty_get_pgrp(struct tty_struct *tty);
 430extern int is_ignored(int sig);
 431extern int tty_signal(int sig, struct tty_struct *tty);
 432extern void tty_hangup(struct tty_struct *tty);
 433extern void tty_vhangup(struct tty_struct *tty);
 434extern void tty_vhangup_locked(struct tty_struct *tty);
 435extern void tty_vhangup_self(void);
 436extern void tty_unhangup(struct file *filp);
 437extern int tty_hung_up_p(struct file *filp);
 438extern void do_SAK(struct tty_struct *tty);
 439extern void __do_SAK(struct tty_struct *tty);
 440extern void disassociate_ctty(int priv);
 441extern void no_tty(void);
 442extern void tty_flip_buffer_push(struct tty_struct *tty);
 443extern void tty_flush_to_ldisc(struct tty_struct *tty);
 444extern void tty_buffer_free_all(struct tty_struct *tty);
 445extern void tty_buffer_flush(struct tty_struct *tty);
 446extern void tty_buffer_init(struct tty_struct *tty);
 447extern speed_t tty_get_baud_rate(struct tty_struct *tty);
 448extern speed_t tty_termios_baud_rate(struct ktermios *termios);
 449extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
 450extern void tty_termios_encode_baud_rate(struct ktermios *termios,
 451                                                speed_t ibaud, speed_t obaud);
 452extern void tty_encode_baud_rate(struct tty_struct *tty,
 453                                                speed_t ibaud, speed_t obaud);
 454extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
 455extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
 456extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
 457
 458extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
 459extern void tty_ldisc_deref(struct tty_ldisc *);
 460extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
 461extern void tty_ldisc_hangup(struct tty_struct *tty);
 462extern const struct file_operations tty_ldiscs_proc_fops;
 463
 464extern void tty_wakeup(struct tty_struct *tty);
 465extern void tty_ldisc_flush(struct tty_struct *tty);
 466
 467extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 468extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
 469                        unsigned int cmd, unsigned long arg);
 470extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
 471extern dev_t tty_devnum(struct tty_struct *tty);
 472extern void proc_clear_tty(struct task_struct *p);
 473extern struct tty_struct *get_current_tty(void);
 474extern void tty_default_fops(struct file_operations *fops);
 475extern struct tty_struct *alloc_tty_struct(void);
 476extern int tty_alloc_file(struct file *file);
 477extern void tty_add_file(struct tty_struct *tty, struct file *file);
 478extern void tty_free_file(struct file *file);
 479extern void free_tty_struct(struct tty_struct *tty);
 480extern void initialize_tty_struct(struct tty_struct *tty,
 481                struct tty_driver *driver, int idx);
 482extern void deinitialize_tty_struct(struct tty_struct *tty);
 483extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
 484extern int tty_release(struct inode *inode, struct file *filp);
 485extern int tty_init_termios(struct tty_struct *tty);
 486extern int tty_standard_install(struct tty_driver *driver,
 487                struct tty_struct *tty);
 488
 489extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
 490extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
 491
 492extern struct mutex tty_mutex;
 493extern spinlock_t tty_files_lock;
 494
 495extern void tty_write_unlock(struct tty_struct *tty);
 496extern int tty_write_lock(struct tty_struct *tty, int ndelay);
 497#define tty_is_writelocked(tty)  (mutex_is_locked(&tty->atomic_write_lock))
 498
 499extern void tty_port_init(struct tty_port *port);
 500extern int tty_port_alloc_xmit_buf(struct tty_port *port);
 501extern void tty_port_free_xmit_buf(struct tty_port *port);
 502extern void tty_port_put(struct tty_port *port);
 503
 504static inline struct tty_port *tty_port_get(struct tty_port *port)
 505{
 506        if (port)
 507                kref_get(&port->kref);
 508        return port;
 509}
 510
 511extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
 512extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
 513extern int tty_port_carrier_raised(struct tty_port *port);
 514extern void tty_port_raise_dtr_rts(struct tty_port *port);
 515extern void tty_port_lower_dtr_rts(struct tty_port *port);
 516extern void tty_port_hangup(struct tty_port *port);
 517extern int tty_port_block_til_ready(struct tty_port *port,
 518                                struct tty_struct *tty, struct file *filp);
 519extern int tty_port_close_start(struct tty_port *port,
 520                                struct tty_struct *tty, struct file *filp);
 521extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
 522extern void tty_port_close(struct tty_port *port,
 523                                struct tty_struct *tty, struct file *filp);
 524extern int tty_port_open(struct tty_port *port,
 525                                struct tty_struct *tty, struct file *filp);
 526static inline int tty_port_users(struct tty_port *port)
 527{
 528        return port->count + port->blocked_open;
 529}
 530
 531extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
 532extern int tty_unregister_ldisc(int disc);
 533extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
 534extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
 535extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
 536extern void tty_ldisc_init(struct tty_struct *tty);
 537extern void tty_ldisc_deinit(struct tty_struct *tty);
 538extern void tty_ldisc_begin(void);
 539/* This last one is just for the tty layer internals and shouldn't be used elsewhere */
 540extern void tty_ldisc_enable(struct tty_struct *tty);
 541
 542
 543/* n_tty.c */
 544extern struct tty_ldisc_ops tty_ldisc_N_TTY;
 545extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
 546
 547/* tty_audit.c */
 548#ifdef CONFIG_AUDIT
 549extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
 550                               size_t size);
 551extern void tty_audit_exit(void);
 552extern void tty_audit_fork(struct signal_struct *sig);
 553extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
 554extern void tty_audit_push(struct tty_struct *tty);
 555extern int tty_audit_push_task(struct task_struct *tsk,
 556                               uid_t loginuid, u32 sessionid);
 557#else
 558static inline void tty_audit_add_data(struct tty_struct *tty,
 559                                      unsigned char *data, size_t size)
 560{
 561}
 562static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
 563{
 564}
 565static inline void tty_audit_exit(void)
 566{
 567}
 568static inline void tty_audit_fork(struct signal_struct *sig)
 569{
 570}
 571static inline void tty_audit_push(struct tty_struct *tty)
 572{
 573}
 574static inline int tty_audit_push_task(struct task_struct *tsk,
 575                                      uid_t loginuid, u32 sessionid)
 576{
 577        return 0;
 578}
 579#endif
 580
 581/* tty_io.c */
 582extern int __init tty_init(void);
 583
 584/* tty_ioctl.c */
 585extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
 586                       unsigned int cmd, unsigned long arg);
 587extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
 588                       unsigned int cmd, unsigned long arg);
 589
 590/* serial.c */
 591
 592extern void serial_console_init(void);
 593
 594/* pcxx.c */
 595
 596extern int pcxe_open(struct tty_struct *tty, struct file *filp);
 597
 598/* vt.c */
 599
 600extern int vt_ioctl(struct tty_struct *tty,
 601                    unsigned int cmd, unsigned long arg);
 602
 603extern long vt_compat_ioctl(struct tty_struct *tty,
 604                     unsigned int cmd, unsigned long arg);
 605
 606/* tty_mutex.c */
 607/* functions for preparation of BKL removal */
 608extern void __lockfunc tty_lock(void) __acquires(tty_lock);
 609extern void __lockfunc tty_unlock(void) __releases(tty_lock);
 610
 611/*
 612 * this shall be called only from where BTM is held (like close)
 613 *
 614 * We need this to ensure nobody waits for us to finish while we are waiting.
 615 * Without this we were encountering system stalls.
 616 *
 617 * This should be indeed removed with BTM removal later.
 618 *
 619 * Locking: BTM required. Nobody is allowed to hold port->mutex.
 620 */
 621static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
 622                long timeout)
 623{
 624        tty_unlock(); /* tty->ops->close holds the BTM, drop it while waiting */
 625        tty_wait_until_sent(tty, timeout);
 626        tty_lock();
 627}
 628
 629/*
 630 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
 631 *
 632 * The condition we are waiting for might take a long time to
 633 * become true, or might depend on another thread taking the
 634 * BTM. In either case, we need to drop the BTM to guarantee
 635 * forward progress. This is a leftover from the conversion
 636 * from the BKL and should eventually get removed as the BTM
 637 * falls out of use.
 638 *
 639 * Do not use in new code.
 640 */
 641#define wait_event_interruptible_tty(wq, condition)                     \
 642({                                                                      \
 643        int __ret = 0;                                                  \
 644        if (!(condition)) {                                             \
 645                __wait_event_interruptible_tty(wq, condition, __ret);   \
 646        }                                                               \
 647        __ret;                                                          \
 648})
 649
 650#define __wait_event_interruptible_tty(wq, condition, ret)              \
 651do {                                                                    \
 652        DEFINE_WAIT(__wait);                                            \
 653                                                                        \
 654        for (;;) {                                                      \
 655                prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);      \
 656                if (condition)                                          \
 657                        break;                                          \
 658                if (!signal_pending(current)) {                         \
 659                        tty_unlock();                                   \
 660                        schedule();                                     \
 661                        tty_lock();                                     \
 662                        continue;                                       \
 663                }                                                       \
 664                ret = -ERESTARTSYS;                                     \
 665                break;                                                  \
 666        }                                                               \
 667        finish_wait(&wq, &__wait);                                      \
 668} while (0)
 669
 670
 671#endif /* __KERNEL__ */
 672#endif
 673
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