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