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