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