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