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