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 #define NR_LDISCS 30 9 10 /* line disciplines */ 11 #define N_TTY 0 12 #define N_SLIP 1 13 #define N_MOUSE 2 14 #define N_PPP 3 15 #define N_STRIP 4 16 #define N_AX25 5 17 #define N_X25 6 /* X.25 async */ 18 #define N_6PACK 7 19 #define N_MASC 8 /* Reserved for Mobitex module <[email protected]> */ 20 #define N_R3964 9 /* Reserved for Simatic R3964 module */ 21 #define N_PROFIBUS_FDL 10 /* Reserved for Profibus */ 22 #define N_IRDA 11 /* Linux IrDa - http://irda.sourceforge.net/ */ 23 #define N_SMSBLOCK 12 /* SMS block mode - for talking to GSM data */ 24 /* cards about SMS messages */ 25 #define N_HDLC 13 /* synchronous HDLC */ 26 #define N_SYNC_PPP 14 /* synchronous PPP */ 27 #define N_HCI 15 /* Bluetooth HCI UART */ 28 #define N_GIGASET_M101 16 /* Siemens Gigaset M101 serial DECT adapter */ 29 #define N_SLCAN 17 /* Serial / USB serial CAN Adaptors */ 30 #define N_PPS 18 /* Pulse per Second */ 31 #define N_V253 19 /* Codec control over voice modem */ 32 #define N_CAIF 20 /* CAIF protocol for talking to modems */ 33 #define N_GSM0710 21 /* GSM 0710 Mux */ 34 #define N_TI_WL 22 /* for TI's WL BT, FM, GPS combo chips */ 35 #define N_TRACESINK 23 /* Trace data routing for MIPI P1149.7 */ 36 #define N_TRACEROUTER 24 /* Trace data routing for MIPI P1149.7 */ 37 38 #ifdef __KERNEL__ 39 #include <linux/fs.h> 40 #include <linux/major.h> 41 #include <linux/termios.h> 42 #include <linux/workqueue.h> 43 #include <linux/tty_driver.h> 44 #include <linux/tty_ldisc.h> 45 #include <linux/mutex.h> 46 47 #include <asm/system.h> 48 49 50 /* 51 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are 52 * hardcoded at present.) 53 */ 54 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ 55 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */ 56 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ 57 58 /* 59 * This character is the same as _POSIX_VDISABLE: it cannot be used as 60 * a c_cc[] character, but indicates that a particular special character 61 * isn't in use (eg VINTR has no character etc) 62 */ 63 #define __DISABLED_CHAR '\0' 64 65 struct tty_buffer { 66 struct tty_buffer *next; 67 char *char_buf_ptr; 68 unsigned char *flag_buf_ptr; 69 int used; 70 int size; 71 int commit; 72 int read; 73 /* Data points here */ 74 unsigned long data[0]; 75 }; 76 77 /* 78 * We default to dicing tty buffer allocations to this many characters 79 * in order to avoid multiple page allocations. We know the size of 80 * tty_buffer itself but it must also be taken into account that the 81 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation 82 * logic this must match 83 */ 84 85 #define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF) 86 87 88 struct tty_bufhead { 89 struct work_struct work; 90 spinlock_t lock; 91 struct tty_buffer *head; /* Queue head */ 92 struct tty_buffer *tail; /* Active buffer */ 93 struct tty_buffer *free; /* Free queue head */ 94 int memory_used; /* Buffer space used excluding 95 free queue */ 96 }; 97 /* 98 * When a break, frame error, or parity error happens, these codes are 99 * stuffed into the flags buffer. 100 */ 101 #define TTY_NORMAL 0 102 #define TTY_BREAK 1 103 #define TTY_FRAME 2 104 #define TTY_PARITY 3 105 #define TTY_OVERRUN 4 106 107 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR]) 108 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT]) 109 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE]) 110 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL]) 111 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF]) 112 #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME]) 113 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN]) 114 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC]) 115 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART]) 116 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP]) 117 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP]) 118 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL]) 119 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT]) 120 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD]) 121 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE]) 122 #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT]) 123 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2]) 124 125 #define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f)) 126 #define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f)) 127 #define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f)) 128 #define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f)) 129 130 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK) 131 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT) 132 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR) 133 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK) 134 #define I_INPCK(tty) _I_FLAG((tty), INPCK) 135 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP) 136 #define I_INLCR(tty) _I_FLAG((tty), INLCR) 137 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR) 138 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL) 139 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC) 140 #define I_IXON(tty) _I_FLAG((tty), IXON) 141 #define I_IXANY(tty) _I_FLAG((tty), IXANY) 142 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF) 143 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL) 144 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8) 145 146 #define O_OPOST(tty) _O_FLAG((tty), OPOST) 147 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC) 148 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR) 149 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL) 150 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR) 151 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET) 152 #define O_OFILL(tty) _O_FLAG((tty), OFILL) 153 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL) 154 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY) 155 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY) 156 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY) 157 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY) 158 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY) 159 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY) 160 161 #define C_BAUD(tty) _C_FLAG((tty), CBAUD) 162 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE) 163 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB) 164 #define C_CREAD(tty) _C_FLAG((tty), CREAD) 165 #define C_PARENB(tty) _C_FLAG((tty), PARENB) 166 #define C_PARODD(tty) _C_FLAG((tty), PARODD) 167 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL) 168 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL) 169 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD) 170 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS) 171 172 #define L_ISIG(tty) _L_FLAG((tty), ISIG) 173 #define L_ICANON(tty) _L_FLAG((tty), ICANON) 174 #define L_XCASE(tty) _L_FLAG((tty), XCASE) 175 #define L_ECHO(tty) _L_FLAG((tty), ECHO) 176 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE) 177 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK) 178 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL) 179 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH) 180 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP) 181 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL) 182 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT) 183 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE) 184 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO) 185 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN) 186 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN) 187 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC) 188 189 struct device; 190 struct signal_struct; 191 192 /* 193 * Port level information. Each device keeps its own port level information 194 * so provide a common structure for those ports wanting to use common support 195 * routines. 196 * 197 * The tty port has a different lifetime to the tty so must be kept apart. 198 * In addition be careful as tty -> port mappings are valid for the life 199 * of the tty object but in many cases port -> tty mappings are valid only 200 * until a hangup so don't use the wrong path. 201 */ 202 203 struct tty_port; 204 205 struct tty_port_operations { 206 /* Return 1 if the carrier is raised */ 207 int (*carrier_raised)(struct tty_port *port); 208 /* Control the DTR line */ 209 void (*dtr_rts)(struct tty_port *port, int raise); 210 /* Called when the last close completes or a hangup finishes 211 IFF the port was initialized. Do not use to free resources. Called 212 under the port mutex to serialize against activate/shutdowns */ 213 void (*shutdown)(struct tty_port *port); 214 void (*drop)(struct tty_port *port); 215 /* Called under the port mutex from tty_port_open, serialized using 216 the port mutex */ 217 /* FIXME: long term getting the tty argument *out* of this would be 218 good for consoles */ 219 int (*activate)(struct tty_port *port, struct tty_struct *tty); 220 /* Called on the final put of a port */ 221 void (*destruct)(struct tty_port *port); 222 }; 223 224 struct tty_port { 225 struct tty_struct *tty; /* Back pointer */ 226 const struct tty_port_operations *ops; /* Port operations */ 227 spinlock_t lock; /* Lock protecting tty field */ 228 int blocked_open; /* Waiting to open */ 229 int count; /* Usage count */ 230 wait_queue_head_t open_wait; /* Open waiters */ 231 wait_queue_head_t close_wait; /* Close waiters */ 232 wait_queue_head_t delta_msr_wait; /* Modem status change */ 233 unsigned long flags; /* TTY flags ASY_*/ 234 unsigned char console:1; /* port is a console */ 235 struct mutex mutex; /* Locking */ 236 struct mutex buf_mutex; /* Buffer alloc lock */ 237 unsigned char *xmit_buf; /* Optional buffer */ 238 unsigned int close_delay; /* Close port delay */ 239 unsigned int closing_wait; /* Delay for output */ 240 int drain_delay; /* Set to zero if no pure time 241 based drain is needed else 242 set to size of fifo */ 243 struct kref kref; /* Ref counter */ 244 }; 245 246 /* 247 * Where all of the state associated with a tty is kept while the tty 248 * is open. Since the termios state should be kept even if the tty 249 * has been closed --- for things like the baud rate, etc --- it is 250 * not stored here, but rather a pointer to the real state is stored 251 * here. Possible the winsize structure should have the same 252 * treatment, but (1) the default 80x24 is usually right and (2) it's 253 * most often used by a windowing system, which will set the correct 254 * size each time the window is created or resized anyway. 255 * - TYT, 9/14/92 256 */ 257 258 struct tty_operations; 259 260 struct tty_struct { 261 int magic; 262 struct kref kref; 263 struct device *dev; 264 struct tty_driver *driver; 265 const struct tty_operations *ops; 266 int index; 267 268 /* Protects ldisc changes: Lock tty not pty */ 269 struct mutex ldisc_mutex; 270 struct tty_ldisc *ldisc; 271 272 struct mutex termios_mutex; 273 spinlock_t ctrl_lock; 274 /* Termios values are protected by the termios mutex */ 275 struct ktermios *termios, *termios_locked; 276 struct termiox *termiox; /* May be NULL for unsupported */ 277 char name[64]; 278 struct pid *pgrp; /* Protected by ctrl lock */ 279 struct pid *session; 280 unsigned long flags; 281 int count; 282 struct winsize winsize; /* termios mutex */ 283 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1; 284 unsigned char low_latency:1, warned:1; 285 unsigned char ctrl_status; /* ctrl_lock */ 286 unsigned int receive_room; /* Bytes free for queue */ 287 288 struct tty_struct *link; 289 struct fasync_struct *fasync; 290 struct tty_bufhead buf; /* Locked internally */ 291 int alt_speed; /* For magic substitution of 38400 bps */ 292 wait_queue_head_t write_wait; 293 wait_queue_head_t read_wait; 294 struct work_struct hangup_work; 295 void *disc_data; 296 void *driver_data; 297 struct list_head tty_files; 298 299 #define N_TTY_BUF_SIZE 4096 300 301 /* 302 * The following is data for the N_TTY line discipline. For 303 * historical reasons, this is included in the tty structure. 304 * Mostly locked by the BKL. 305 */ 306 unsigned int column; 307 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1; 308 unsigned char closing:1; 309 unsigned char echo_overrun:1; 310 unsigned short minimum_to_wake; 311 unsigned long overrun_time; 312 int num_overrun; 313 unsigned long process_char_map[256/(8*sizeof(unsigned long))]; 314 char *read_buf; 315 int read_head; 316 int read_tail; 317 int read_cnt; 318 unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))]; 319 unsigned char *echo_buf; 320 unsigned int echo_pos; 321 unsigned int echo_cnt; 322 int canon_data; 323 unsigned long canon_head; 324 unsigned int canon_column; 325 struct mutex atomic_read_lock; 326 struct mutex atomic_write_lock; 327 struct mutex output_lock; 328 struct mutex echo_lock; 329 unsigned char *write_buf; 330 int write_cnt; 331 spinlock_t read_lock; 332 /* If the tty has a pending do_SAK, queue it here - akpm */ 333 struct work_struct SAK_work; 334 struct tty_port *port; 335 }; 336 337 /* Each of a tty's open files has private_data pointing to tty_file_private */ 338 struct tty_file_private { 339 struct tty_struct *tty; 340 struct file *file; 341 struct list_head list; 342 }; 343 344 /* tty magic number */ 345 #define TTY_MAGIC 0x5401 346 347 /* 348 * These bits are used in the flags field of the tty structure. 349 * 350 * So that interrupts won't be able to mess up the queues, 351 * copy_to_cooked must be atomic with respect to itself, as must 352 * tty->write. Thus, you must use the inline functions set_bit() and 353 * clear_bit() to make things atomic. 354 */ 355 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ 356 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */ 357 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ 358 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */ 359 #define TTY_DEBUG 4 /* Debugging */ 360 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ 361 #define TTY_PUSH 6 /* n_tty private */ 362 #define TTY_CLOSING 7 /* ->close() in progress */ 363 #define TTY_LDISC 9 /* Line discipline attached */ 364 #define TTY_LDISC_CHANGING 10 /* Line discipline changing */ 365 #define TTY_LDISC_OPEN 11 /* Line discipline is open */ 366 #define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */ 367 #define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */ 368 #define TTY_PTY_LOCK 16 /* pty private */ 369 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ 370 #define TTY_HUPPED 18 /* Post driver->hangup() */ 371 #define TTY_FLUSHING 19 /* Flushing to ldisc in progress */ 372 #define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */ 373 #define TTY_HUPPING 21 /* ->hangup() in progress */ 374 375 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty)) 376 377 extern void tty_write_flush(struct tty_struct *); 378 379 extern struct ktermios tty_std_termios; 380 381 extern void console_init(void); 382 extern int vcs_init(void); 383 384 extern struct class *tty_class; 385 386 /** 387 * tty_kref_get - get a tty reference 388 * @tty: tty device 389 * 390 * Return a new reference to a tty object. The caller must hold 391 * sufficient locks/counts to ensure that their existing reference cannot 392 * go away 393 */ 394 395 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) 396 { 397 if (tty) 398 kref_get(&tty->kref); 399 return tty; 400 } 401 extern void tty_kref_put(struct tty_struct *tty); 402 403 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, 404 const char *routine); 405 extern char *tty_name(struct tty_struct *tty, char *buf); 406 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); 407 extern int tty_check_change(struct tty_struct *tty); 408 extern void stop_tty(struct tty_struct *tty); 409 extern void start_tty(struct tty_struct *tty); 410 extern int tty_register_driver(struct tty_driver *driver); 411 extern int tty_unregister_driver(struct tty_driver *driver); 412 extern struct device *tty_register_device(struct tty_driver *driver, 413 unsigned index, struct device *dev); 414 extern void tty_unregister_device(struct tty_driver *driver, unsigned index); 415 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp, 416 int buflen); 417 extern void tty_write_message(struct tty_struct *tty, char *msg); 418 extern int tty_put_char(struct tty_struct *tty, unsigned char c); 419 extern int tty_chars_in_buffer(struct tty_struct *tty); 420 extern int tty_write_room(struct tty_struct *tty); 421 extern void tty_driver_flush_buffer(struct tty_struct *tty); 422 extern void tty_throttle(struct tty_struct *tty); 423 extern void tty_unthrottle(struct tty_struct *tty); 424 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); 425 extern void tty_driver_remove_tty(struct tty_driver *driver, 426 struct tty_struct *tty); 427 extern void tty_shutdown(struct tty_struct *tty); 428 extern void tty_free_termios(struct tty_struct *tty); 429 extern int is_current_pgrp_orphaned(void); 430 extern struct pid *tty_get_pgrp(struct tty_struct *tty); 431 extern int is_ignored(int sig); 432 extern int tty_signal(int sig, struct tty_struct *tty); 433 extern void tty_hangup(struct tty_struct *tty); 434 extern void tty_vhangup(struct tty_struct *tty); 435 extern void tty_vhangup_locked(struct tty_struct *tty); 436 extern void tty_vhangup_self(void); 437 extern void tty_unhangup(struct file *filp); 438 extern int tty_hung_up_p(struct file *filp); 439 extern void do_SAK(struct tty_struct *tty); 440 extern void __do_SAK(struct tty_struct *tty); 441 extern void disassociate_ctty(int priv); 442 extern void no_tty(void); 443 extern void tty_flip_buffer_push(struct tty_struct *tty); 444 extern void tty_flush_to_ldisc(struct tty_struct *tty); 445 extern void tty_buffer_free_all(struct tty_struct *tty); 446 extern void tty_buffer_flush(struct tty_struct *tty); 447 extern void tty_buffer_init(struct tty_struct *tty); 448 extern speed_t tty_get_baud_rate(struct tty_struct *tty); 449 extern speed_t tty_termios_baud_rate(struct ktermios *termios); 450 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); 451 extern void tty_termios_encode_baud_rate(struct ktermios *termios, 452 speed_t ibaud, speed_t obaud); 453 extern void tty_encode_baud_rate(struct tty_struct *tty, 454 speed_t ibaud, speed_t obaud); 455 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); 456 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b); 457 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt); 458 459 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); 460 extern void tty_ldisc_deref(struct tty_ldisc *); 461 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); 462 extern void tty_ldisc_hangup(struct tty_struct *tty); 463 extern const struct file_operations tty_ldiscs_proc_fops; 464 465 extern void tty_wakeup(struct tty_struct *tty); 466 extern void tty_ldisc_flush(struct tty_struct *tty); 467 468 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 469 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, 470 unsigned int cmd, unsigned long arg); 471 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); 472 extern dev_t tty_devnum(struct tty_struct *tty); 473 extern void proc_clear_tty(struct task_struct *p); 474 extern struct tty_struct *get_current_tty(void); 475 extern void tty_default_fops(struct file_operations *fops); 476 extern struct tty_struct *alloc_tty_struct(void); 477 extern int tty_alloc_file(struct file *file); 478 extern void tty_add_file(struct tty_struct *tty, struct file *file); 479 extern void tty_free_file(struct file *file); 480 extern void free_tty_struct(struct tty_struct *tty); 481 extern void initialize_tty_struct(struct tty_struct *tty, 482 struct tty_driver *driver, int idx); 483 extern void deinitialize_tty_struct(struct tty_struct *tty); 484 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx); 485 extern int tty_release(struct inode *inode, struct file *filp); 486 extern int tty_init_termios(struct tty_struct *tty); 487 extern int tty_standard_install(struct tty_driver *driver, 488 struct tty_struct *tty); 489 490 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty); 491 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty); 492 493 extern struct mutex tty_mutex; 494 extern spinlock_t tty_files_lock; 495 496 extern void tty_write_unlock(struct tty_struct *tty); 497 extern int tty_write_lock(struct tty_struct *tty, int ndelay); 498 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) 499 500 extern void tty_port_init(struct tty_port *port); 501 extern int tty_port_alloc_xmit_buf(struct tty_port *port); 502 extern void tty_port_free_xmit_buf(struct tty_port *port); 503 extern void tty_port_put(struct tty_port *port); 504 505 static inline struct tty_port *tty_port_get(struct tty_port *port) 506 { 507 if (port) 508 kref_get(&port->kref); 509 return port; 510 } 511 512 extern struct tty_struct *tty_port_tty_get(struct tty_port *port); 513 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); 514 extern int tty_port_carrier_raised(struct tty_port *port); 515 extern void tty_port_raise_dtr_rts(struct tty_port *port); 516 extern void tty_port_lower_dtr_rts(struct tty_port *port); 517 extern void tty_port_hangup(struct tty_port *port); 518 extern int tty_port_block_til_ready(struct tty_port *port, 519 struct tty_struct *tty, struct file *filp); 520 extern int tty_port_close_start(struct tty_port *port, 521 struct tty_struct *tty, struct file *filp); 522 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); 523 extern void tty_port_close(struct tty_port *port, 524 struct tty_struct *tty, struct file *filp); 525 extern int tty_port_open(struct tty_port *port, 526 struct tty_struct *tty, struct file *filp); 527 static inline int tty_port_users(struct tty_port *port) 528 { 529 return port->count + port->blocked_open; 530 } 531 532 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); 533 extern int tty_unregister_ldisc(int disc); 534 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc); 535 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); 536 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty); 537 extern void tty_ldisc_init(struct tty_struct *tty); 538 extern void tty_ldisc_deinit(struct tty_struct *tty); 539 extern void tty_ldisc_begin(void); 540 /* This last one is just for the tty layer internals and shouldn't be used elsewhere */ 541 extern void tty_ldisc_enable(struct tty_struct *tty); 542 543 544 /* n_tty.c */ 545 extern struct tty_ldisc_ops tty_ldisc_N_TTY; 546 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); 547 548 /* tty_audit.c */ 549 #ifdef CONFIG_AUDIT 550 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, 551 size_t size); 552 extern void tty_audit_exit(void); 553 extern void tty_audit_fork(struct signal_struct *sig); 554 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); 555 extern void tty_audit_push(struct tty_struct *tty); 556 extern int tty_audit_push_task(struct task_struct *tsk, 557 uid_t loginuid, u32 sessionid); 558 #else 559 static inline void tty_audit_add_data(struct tty_struct *tty, 560 unsigned char *data, size_t size) 561 { 562 } 563 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) 564 { 565 } 566 static inline void tty_audit_exit(void) 567 { 568 } 569 static inline void tty_audit_fork(struct signal_struct *sig) 570 { 571 } 572 static inline void tty_audit_push(struct tty_struct *tty) 573 { 574 } 575 static inline int tty_audit_push_task(struct task_struct *tsk, 576 uid_t loginuid, u32 sessionid) 577 { 578 return 0; 579 } 580 #endif 581 582 /* tty_io.c */ 583 extern int __init tty_init(void); 584 585 /* tty_ioctl.c */ 586 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, 587 unsigned int cmd, unsigned long arg); 588 extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, 589 unsigned int cmd, unsigned long arg); 590 591 /* serial.c */ 592 593 extern void serial_console_init(void); 594 595 /* pcxx.c */ 596 597 extern int pcxe_open(struct tty_struct *tty, struct file *filp); 598 599 /* vt.c */ 600 601 extern int vt_ioctl(struct tty_struct *tty, 602 unsigned int cmd, unsigned long arg); 603 604 extern long vt_compat_ioctl(struct tty_struct *tty, 605 unsigned int cmd, unsigned long arg); 606 607 /* tty_mutex.c */ 608 /* functions for preparation of BKL removal */ 609 extern void __lockfunc tty_lock(void) __acquires(tty_lock); 610 extern void __lockfunc tty_unlock(void) __releases(tty_lock); 611 612 /* 613 * this shall be called only from where BTM is held (like close) 614 * 615 * We need this to ensure nobody waits for us to finish while we are waiting. 616 * Without this we were encountering system stalls. 617 * 618 * This should be indeed removed with BTM removal later. 619 * 620 * Locking: BTM required. Nobody is allowed to hold port->mutex. 621 */ 622 static inline void tty_wait_until_sent_from_close(struct tty_struct *tty, 623 long timeout) 624 { 625 tty_unlock(); /* tty->ops->close holds the BTM, drop it while waiting */ 626 tty_wait_until_sent(tty, timeout); 627 tty_lock(); 628 } 629 630 /* 631 * wait_event_interruptible_tty -- wait for a condition with the tty lock held 632 * 633 * The condition we are waiting for might take a long time to 634 * become true, or might depend on another thread taking the 635 * BTM. In either case, we need to drop the BTM to guarantee 636 * forward progress. This is a leftover from the conversion 637 * from the BKL and should eventually get removed as the BTM 638 * falls out of use. 639 * 640 * Do not use in new code. 641 */ 642 #define wait_event_interruptible_tty(wq, condition) \ 643 ({ \ 644 int __ret = 0; \ 645 if (!(condition)) { \ 646 __wait_event_interruptible_tty(wq, condition, __ret); \ 647 } \ 648 __ret; \ 649 }) 650 651 #define __wait_event_interruptible_tty(wq, condition, ret) \ 652 do { \ 653 DEFINE_WAIT(__wait); \ 654 \ 655 for (;;) { \ 656 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \ 657 if (condition) \ 658 break; \ 659 if (!signal_pending(current)) { \ 660 tty_unlock(); \ 661 schedule(); \ 662 tty_lock(); \ 663 continue; \ 664 } \ 665 ret = -ERESTARTSYS; \ 666 break; \ 667 } \ 668 finish_wait(&wq, &__wait); \ 669 } while (0) 670 671 672 #endif /* __KERNEL__ */ 673 #endif 674