1 #ifndef _LINUX_TTY_H 2 #define _LINUX_TTY_H 3 4 #include <linux/fs.h> 5 #include <linux/major.h> 6 #include <linux/termios.h> 7 #include <linux/workqueue.h> 8 #include <linux/tty_driver.h> 9 #include <linux/tty_ldisc.h> 10 #include <linux/mutex.h> 11 #include <linux/tty_flags.h> 12 #include <uapi/linux/tty.h> 13 #include <linux/rwsem.h> 14 #include <linux/llist.h> 15 16 17 /* 18 * Lock subclasses for tty locks 19 * 20 * TTY_LOCK_NORMAL is for normal ttys and master ptys. 21 * TTY_LOCK_SLAVE is for slave ptys only. 22 * 23 * Lock subclasses are necessary for handling nested locking with pty pairs. 24 * tty locks which use nested locking: 25 * 26 * legacy_mutex - Nested tty locks are necessary for releasing pty pairs. 27 * The stable lock order is master pty first, then slave pty. 28 * termios_rwsem - The stable lock order is tty_buffer lock->termios_rwsem. 29 * Subclassing this lock enables the slave pty to hold its 30 * termios_rwsem when claiming the master tty_buffer lock. 31 * tty_buffer lock - slave ptys can claim nested buffer lock when handling 32 * signal chars. The stable lock order is slave pty, then 33 * master. 34 */ 35 36 enum { 37 TTY_LOCK_NORMAL = 0, 38 TTY_LOCK_SLAVE, 39 }; 40 41 /* 42 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are 43 * hardcoded at present.) 44 */ 45 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ 46 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */ 47 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ 48 49 /* 50 * This character is the same as _POSIX_VDISABLE: it cannot be used as 51 * a c_cc[] character, but indicates that a particular special character 52 * isn't in use (eg VINTR has no character etc) 53 */ 54 #define __DISABLED_CHAR '\0' 55 56 struct tty_buffer { 57 union { 58 struct tty_buffer *next; 59 struct llist_node free; 60 }; 61 int used; 62 int size; 63 int commit; 64 int read; 65 int flags; 66 /* Data points here */ 67 unsigned long data[0]; 68 }; 69 70 /* Values for .flags field of tty_buffer */ 71 #define TTYB_NORMAL 1 /* buffer has no flags buffer */ 72 73 static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs) 74 { 75 return ((unsigned char *)b->data) + ofs; 76 } 77 78 static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs) 79 { 80 return (char *)char_buf_ptr(b, ofs) + b->size; 81 } 82 83 struct tty_bufhead { 84 struct tty_buffer *head; /* Queue head */ 85 struct work_struct work; 86 struct mutex lock; 87 atomic_t priority; 88 struct tty_buffer sentinel; 89 struct llist_head free; /* Free queue head */ 90 atomic_t mem_used; /* In-use buffers excluding free list */ 91 int mem_limit; 92 struct tty_buffer *tail; /* Active buffer */ 93 }; 94 /* 95 * When a break, frame error, or parity error happens, these codes are 96 * stuffed into the flags buffer. 97 */ 98 #define TTY_NORMAL 0 99 #define TTY_BREAK 1 100 #define TTY_FRAME 2 101 #define TTY_PARITY 3 102 #define TTY_OVERRUN 4 103 104 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR]) 105 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT]) 106 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE]) 107 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL]) 108 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF]) 109 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME]) 110 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN]) 111 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC]) 112 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART]) 113 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP]) 114 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP]) 115 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL]) 116 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT]) 117 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD]) 118 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE]) 119 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT]) 120 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2]) 121 122 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f)) 123 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f)) 124 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f)) 125 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f)) 126 127 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK) 128 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT) 129 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR) 130 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK) 131 #define I_INPCK(tty) _I_FLAG((tty), INPCK) 132 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP) 133 #define I_INLCR(tty) _I_FLAG((tty), INLCR) 134 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR) 135 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL) 136 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC) 137 #define I_IXON(tty) _I_FLAG((tty), IXON) 138 #define I_IXANY(tty) _I_FLAG((tty), IXANY) 139 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF) 140 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL) 141 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8) 142 143 #define O_OPOST(tty) _O_FLAG((tty), OPOST) 144 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC) 145 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR) 146 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL) 147 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR) 148 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET) 149 #define O_OFILL(tty) _O_FLAG((tty), OFILL) 150 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL) 151 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY) 152 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY) 153 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY) 154 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY) 155 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY) 156 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY) 157 158 #define C_BAUD(tty) _C_FLAG((tty), CBAUD) 159 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE) 160 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB) 161 #define C_CREAD(tty) _C_FLAG((tty), CREAD) 162 #define C_PARENB(tty) _C_FLAG((tty), PARENB) 163 #define C_PARODD(tty) _C_FLAG((tty), PARODD) 164 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL) 165 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL) 166 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD) 167 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS) 168 #define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR) 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 /* Called under the port mutex from tty_port_open, serialized using 213 the port mutex */ 214 /* FIXME: long term getting the tty argument *out* of this would be 215 good for consoles */ 216 int (*activate)(struct tty_port *port, struct tty_struct *tty); 217 /* Called on the final put of a port */ 218 void (*destruct)(struct tty_port *port); 219 }; 220 221 struct tty_port_client_operations { 222 int (*receive_buf)(struct tty_port *port, const unsigned char *, const unsigned char *, size_t); 223 void (*write_wakeup)(struct tty_port *port); 224 }; 225 226 struct tty_port { 227 struct tty_bufhead buf; /* Locked internally */ 228 struct tty_struct *tty; /* Back pointer */ 229 struct tty_struct *itty; /* internal back ptr */ 230 const struct tty_port_operations *ops; /* Port operations */ 231 const struct tty_port_client_operations *client_ops; /* Port client operations */ 232 spinlock_t lock; /* Lock protecting tty field */ 233 int blocked_open; /* Waiting to open */ 234 int count; /* Usage count */ 235 wait_queue_head_t open_wait; /* Open waiters */ 236 wait_queue_head_t delta_msr_wait; /* Modem status change */ 237 unsigned long flags; /* User TTY flags ASYNC_ */ 238 unsigned long iflags; /* Internal flags TTY_PORT_ */ 239 unsigned char console:1, /* port is a console */ 240 low_latency:1; /* optional: tune for latency */ 241 struct mutex mutex; /* Locking */ 242 struct mutex buf_mutex; /* Buffer alloc lock */ 243 unsigned char *xmit_buf; /* Optional buffer */ 244 unsigned int close_delay; /* Close port delay */ 245 unsigned int closing_wait; /* Delay for output */ 246 int drain_delay; /* Set to zero if no pure time 247 based drain is needed else 248 set to size of fifo */ 249 struct kref kref; /* Ref counter */ 250 void *client_data; 251 }; 252 253 /* tty_port::iflags bits -- use atomic bit ops */ 254 #define TTY_PORT_INITIALIZED 0 /* device is initialized */ 255 #define TTY_PORT_SUSPENDED 1 /* device is suspended */ 256 #define TTY_PORT_ACTIVE 2 /* device is open */ 257 258 /* 259 * uart drivers: use the uart_port::status field and the UPSTAT_* defines 260 * for s/w-based flow control steering and carrier detection status 261 */ 262 #define TTY_PORT_CTS_FLOW 3 /* h/w flow control enabled */ 263 #define TTY_PORT_CHECK_CD 4 /* carrier detect enabled */ 264 #define TTY_PORT_KOPENED 5 /* device exclusively opened by 265 kernel */ 266 267 /* 268 * Where all of the state associated with a tty is kept while the tty 269 * is open. Since the termios state should be kept even if the tty 270 * has been closed --- for things like the baud rate, etc --- it is 271 * not stored here, but rather a pointer to the real state is stored 272 * here. Possible the winsize structure should have the same 273 * treatment, but (1) the default 80x24 is usually right and (2) it's 274 * most often used by a windowing system, which will set the correct 275 * size each time the window is created or resized anyway. 276 * - TYT, 9/14/92 277 */ 278 279 struct tty_operations; 280 281 struct tty_struct { 282 int magic; 283 struct kref kref; 284 struct device *dev; 285 struct tty_driver *driver; 286 const struct tty_operations *ops; 287 int index; 288 289 /* Protects ldisc changes: Lock tty not pty */ 290 struct ld_semaphore ldisc_sem; 291 struct tty_ldisc *ldisc; 292 293 struct mutex atomic_write_lock; 294 struct mutex legacy_mutex; 295 struct mutex throttle_mutex; 296 struct rw_semaphore termios_rwsem; 297 struct mutex winsize_mutex; 298 spinlock_t ctrl_lock; 299 spinlock_t flow_lock; 300 /* Termios values are protected by the termios rwsem */ 301 struct ktermios termios, termios_locked; 302 struct termiox *termiox; /* May be NULL for unsupported */ 303 char name[64]; 304 struct pid *pgrp; /* Protected by ctrl lock */ 305 struct pid *session; 306 unsigned long flags; 307 int count; 308 struct winsize winsize; /* winsize_mutex */ 309 unsigned long stopped:1, /* flow_lock */ 310 flow_stopped:1, 311 unused:BITS_PER_LONG - 2; 312 int hw_stopped; 313 unsigned long ctrl_status:8, /* ctrl_lock */ 314 packet:1, 315 unused_ctrl:BITS_PER_LONG - 9; 316 unsigned int receive_room; /* Bytes free for queue */ 317 int flow_change; 318 319 struct tty_struct *link; 320 struct fasync_struct *fasync; 321 wait_queue_head_t write_wait; 322 wait_queue_head_t read_wait; 323 struct work_struct hangup_work; 324 void *disc_data; 325 void *driver_data; 326 spinlock_t files_lock; /* protects tty_files list */ 327 struct list_head tty_files; 328 329 #define N_TTY_BUF_SIZE 4096 330 331 int closing; 332 unsigned char *write_buf; 333 int write_cnt; 334 /* If the tty has a pending do_SAK, queue it here - akpm */ 335 struct work_struct SAK_work; 336 struct tty_port *port; 337 } __randomize_layout; 338 339 /* Each of a tty's open files has private_data pointing to tty_file_private */ 340 struct tty_file_private { 341 struct tty_struct *tty; 342 struct file *file; 343 struct list_head list; 344 }; 345 346 /* tty magic number */ 347 #define TTY_MAGIC 0x5401 348 349 /* 350 * These bits are used in the flags field of the tty structure. 351 * 352 * So that interrupts won't be able to mess up the queues, 353 * copy_to_cooked must be atomic with respect to itself, as must 354 * tty->write. Thus, you must use the inline functions set_bit() and 355 * clear_bit() to make things atomic. 356 */ 357 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ 358 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */ 359 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ 360 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */ 361 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ 362 #define TTY_LDISC_OPEN 11 /* Line discipline is open */ 363 #define TTY_PTY_LOCK 16 /* pty private */ 364 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ 365 #define TTY_HUPPED 18 /* Post driver->hangup() */ 366 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */ 367 368 /* Values for tty->flow_change */ 369 #define TTY_THROTTLE_SAFE 1 370 #define TTY_UNTHROTTLE_SAFE 2 371 372 static inline void __tty_set_flow_change(struct tty_struct *tty, int val) 373 { 374 tty->flow_change = val; 375 } 376 377 static inline void tty_set_flow_change(struct tty_struct *tty, int val) 378 { 379 tty->flow_change = val; 380 smp_mb(); 381 } 382 383 static inline bool tty_io_error(struct tty_struct *tty) 384 { 385 return test_bit(TTY_IO_ERROR, &tty->flags); 386 } 387 388 static inline bool tty_throttled(struct tty_struct *tty) 389 { 390 return test_bit(TTY_THROTTLED, &tty->flags); 391 } 392 393 #ifdef CONFIG_TTY 394 extern void tty_kref_put(struct tty_struct *tty); 395 extern struct pid *tty_get_pgrp(struct tty_struct *tty); 396 extern void tty_vhangup_self(void); 397 extern void disassociate_ctty(int priv); 398 extern dev_t tty_devnum(struct tty_struct *tty); 399 extern void proc_clear_tty(struct task_struct *p); 400 extern struct tty_struct *get_current_tty(void); 401 /* tty_io.c */ 402 extern int __init tty_init(void); 403 extern const char *tty_name(const struct tty_struct *tty); 404 extern struct tty_struct *tty_kopen(dev_t device); 405 extern void tty_kclose(struct tty_struct *tty); 406 extern int tty_dev_name_to_number(const char *name, dev_t *number); 407 #else 408 static inline void tty_kref_put(struct tty_struct *tty) 409 { } 410 static inline struct pid *tty_get_pgrp(struct tty_struct *tty) 411 { return NULL; } 412 static inline void tty_vhangup_self(void) 413 { } 414 static inline void disassociate_ctty(int priv) 415 { } 416 static inline dev_t tty_devnum(struct tty_struct *tty) 417 { return 0; } 418 static inline void proc_clear_tty(struct task_struct *p) 419 { } 420 static inline struct tty_struct *get_current_tty(void) 421 { return NULL; } 422 /* tty_io.c */ 423 static inline int __init tty_init(void) 424 { return 0; } 425 static inline const char *tty_name(const struct tty_struct *tty) 426 { return "(none)"; } 427 static inline struct tty_struct *tty_kopen(dev_t device) 428 { return ERR_PTR(-ENODEV); } 429 static inline void tty_kclose(struct tty_struct *tty) 430 { } 431 static inline int tty_dev_name_to_number(const char *name, dev_t *number) 432 { return -ENOTSUPP; } 433 #endif 434 435 extern struct ktermios tty_std_termios; 436 437 extern int vcs_init(void); 438 439 extern struct class *tty_class; 440 441 /** 442 * tty_kref_get - get a tty reference 443 * @tty: tty device 444 * 445 * Return a new reference to a tty object. The caller must hold 446 * sufficient locks/counts to ensure that their existing reference cannot 447 * go away 448 */ 449 450 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) 451 { 452 if (tty) 453 kref_get(&tty->kref); 454 return tty; 455 } 456 457 extern const char *tty_driver_name(const struct tty_struct *tty); 458 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); 459 extern int __tty_check_change(struct tty_struct *tty, int sig); 460 extern int tty_check_change(struct tty_struct *tty); 461 extern void __stop_tty(struct tty_struct *tty); 462 extern void stop_tty(struct tty_struct *tty); 463 extern void __start_tty(struct tty_struct *tty); 464 extern void start_tty(struct tty_struct *tty); 465 extern int tty_register_driver(struct tty_driver *driver); 466 extern int tty_unregister_driver(struct tty_driver *driver); 467 extern struct device *tty_register_device(struct tty_driver *driver, 468 unsigned index, struct device *dev); 469 extern struct device *tty_register_device_attr(struct tty_driver *driver, 470 unsigned index, struct device *device, 471 void *drvdata, 472 const struct attribute_group **attr_grp); 473 extern void tty_unregister_device(struct tty_driver *driver, unsigned index); 474 extern void tty_write_message(struct tty_struct *tty, char *msg); 475 extern int tty_send_xchar(struct tty_struct *tty, char ch); 476 extern int tty_put_char(struct tty_struct *tty, unsigned char c); 477 extern int tty_chars_in_buffer(struct tty_struct *tty); 478 extern int tty_write_room(struct tty_struct *tty); 479 extern void tty_driver_flush_buffer(struct tty_struct *tty); 480 extern void tty_throttle(struct tty_struct *tty); 481 extern void tty_unthrottle(struct tty_struct *tty); 482 extern int tty_throttle_safe(struct tty_struct *tty); 483 extern int tty_unthrottle_safe(struct tty_struct *tty); 484 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); 485 extern int is_current_pgrp_orphaned(void); 486 extern void tty_hangup(struct tty_struct *tty); 487 extern void tty_vhangup(struct tty_struct *tty); 488 extern void tty_vhangup_session(struct tty_struct *tty); 489 extern int tty_hung_up_p(struct file *filp); 490 extern void do_SAK(struct tty_struct *tty); 491 extern void __do_SAK(struct tty_struct *tty); 492 extern void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty); 493 extern int tty_signal_session_leader(struct tty_struct *tty, int exit_session); 494 extern void session_clear_tty(struct pid *session); 495 extern void no_tty(void); 496 extern void tty_buffer_free_all(struct tty_port *port); 497 extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld); 498 extern void tty_buffer_init(struct tty_port *port); 499 extern void tty_buffer_set_lock_subclass(struct tty_port *port); 500 extern bool tty_buffer_restart_work(struct tty_port *port); 501 extern bool tty_buffer_cancel_work(struct tty_port *port); 502 extern void tty_buffer_flush_work(struct tty_port *port); 503 extern speed_t tty_termios_baud_rate(struct ktermios *termios); 504 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); 505 extern void tty_termios_encode_baud_rate(struct ktermios *termios, 506 speed_t ibaud, speed_t obaud); 507 extern void tty_encode_baud_rate(struct tty_struct *tty, 508 speed_t ibaud, speed_t obaud); 509 510 /** 511 * tty_get_baud_rate - get tty bit rates 512 * @tty: tty to query 513 * 514 * Returns the baud rate as an integer for this terminal. The 515 * termios lock must be held by the caller and the terminal bit 516 * flags may be updated. 517 * 518 * Locking: none 519 */ 520 static inline speed_t tty_get_baud_rate(struct tty_struct *tty) 521 { 522 return tty_termios_baud_rate(&tty->termios); 523 } 524 525 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); 526 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b); 527 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt); 528 529 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); 530 extern void tty_ldisc_deref(struct tty_ldisc *); 531 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); 532 extern void tty_ldisc_hangup(struct tty_struct *tty, bool reset); 533 extern int tty_ldisc_reinit(struct tty_struct *tty, int disc); 534 extern const struct file_operations tty_ldiscs_proc_fops; 535 536 extern void tty_wakeup(struct tty_struct *tty); 537 extern void tty_ldisc_flush(struct tty_struct *tty); 538 539 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 540 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, 541 unsigned int cmd, unsigned long arg); 542 extern long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty, 543 struct file *file, unsigned int cmd, unsigned long arg); 544 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); 545 extern void tty_default_fops(struct file_operations *fops); 546 extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx); 547 extern int tty_alloc_file(struct file *file); 548 extern void tty_add_file(struct tty_struct *tty, struct file *file); 549 extern void tty_free_file(struct file *file); 550 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx); 551 extern void tty_release_struct(struct tty_struct *tty, int idx); 552 extern int tty_release(struct inode *inode, struct file *filp); 553 extern void tty_init_termios(struct tty_struct *tty); 554 extern int tty_standard_install(struct tty_driver *driver, 555 struct tty_struct *tty); 556 557 extern struct mutex tty_mutex; 558 559 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) 560 561 extern void tty_port_init(struct tty_port *port); 562 extern void tty_port_link_device(struct tty_port *port, 563 struct tty_driver *driver, unsigned index); 564 extern struct device *tty_port_register_device(struct tty_port *port, 565 struct tty_driver *driver, unsigned index, 566 struct device *device); 567 extern struct device *tty_port_register_device_attr(struct tty_port *port, 568 struct tty_driver *driver, unsigned index, 569 struct device *device, void *drvdata, 570 const struct attribute_group **attr_grp); 571 extern struct device *tty_port_register_device_serdev(struct tty_port *port, 572 struct tty_driver *driver, unsigned index, 573 struct device *device); 574 extern struct device *tty_port_register_device_attr_serdev(struct tty_port *port, 575 struct tty_driver *driver, unsigned index, 576 struct device *device, void *drvdata, 577 const struct attribute_group **attr_grp); 578 extern void tty_port_unregister_device(struct tty_port *port, 579 struct tty_driver *driver, unsigned index); 580 extern int tty_port_alloc_xmit_buf(struct tty_port *port); 581 extern void tty_port_free_xmit_buf(struct tty_port *port); 582 extern void tty_port_destroy(struct tty_port *port); 583 extern void tty_port_put(struct tty_port *port); 584 585 static inline struct tty_port *tty_port_get(struct tty_port *port) 586 { 587 if (port && kref_get_unless_zero(&port->kref)) 588 return port; 589 return NULL; 590 } 591 592 /* If the cts flow control is enabled, return true. */ 593 static inline bool tty_port_cts_enabled(struct tty_port *port) 594 { 595 return test_bit(TTY_PORT_CTS_FLOW, &port->iflags); 596 } 597 598 static inline void tty_port_set_cts_flow(struct tty_port *port, bool val) 599 { 600 if (val) 601 set_bit(TTY_PORT_CTS_FLOW, &port->iflags); 602 else 603 clear_bit(TTY_PORT_CTS_FLOW, &port->iflags); 604 } 605 606 static inline bool tty_port_active(struct tty_port *port) 607 { 608 return test_bit(TTY_PORT_ACTIVE, &port->iflags); 609 } 610 611 static inline void tty_port_set_active(struct tty_port *port, bool val) 612 { 613 if (val) 614 set_bit(TTY_PORT_ACTIVE, &port->iflags); 615 else 616 clear_bit(TTY_PORT_ACTIVE, &port->iflags); 617 } 618 619 static inline bool tty_port_check_carrier(struct tty_port *port) 620 { 621 return test_bit(TTY_PORT_CHECK_CD, &port->iflags); 622 } 623 624 static inline void tty_port_set_check_carrier(struct tty_port *port, bool val) 625 { 626 if (val) 627 set_bit(TTY_PORT_CHECK_CD, &port->iflags); 628 else 629 clear_bit(TTY_PORT_CHECK_CD, &port->iflags); 630 } 631 632 static inline bool tty_port_suspended(struct tty_port *port) 633 { 634 return test_bit(TTY_PORT_SUSPENDED, &port->iflags); 635 } 636 637 static inline void tty_port_set_suspended(struct tty_port *port, bool val) 638 { 639 if (val) 640 set_bit(TTY_PORT_SUSPENDED, &port->iflags); 641 else 642 clear_bit(TTY_PORT_SUSPENDED, &port->iflags); 643 } 644 645 static inline bool tty_port_initialized(struct tty_port *port) 646 { 647 return test_bit(TTY_PORT_INITIALIZED, &port->iflags); 648 } 649 650 static inline void tty_port_set_initialized(struct tty_port *port, bool val) 651 { 652 if (val) 653 set_bit(TTY_PORT_INITIALIZED, &port->iflags); 654 else 655 clear_bit(TTY_PORT_INITIALIZED, &port->iflags); 656 } 657 658 static inline bool tty_port_kopened(struct tty_port *port) 659 { 660 return test_bit(TTY_PORT_KOPENED, &port->iflags); 661 } 662 663 static inline void tty_port_set_kopened(struct tty_port *port, bool val) 664 { 665 if (val) 666 set_bit(TTY_PORT_KOPENED, &port->iflags); 667 else 668 clear_bit(TTY_PORT_KOPENED, &port->iflags); 669 } 670 671 extern struct tty_struct *tty_port_tty_get(struct tty_port *port); 672 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); 673 extern int tty_port_carrier_raised(struct tty_port *port); 674 extern void tty_port_raise_dtr_rts(struct tty_port *port); 675 extern void tty_port_lower_dtr_rts(struct tty_port *port); 676 extern void tty_port_hangup(struct tty_port *port); 677 extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal); 678 extern void tty_port_tty_wakeup(struct tty_port *port); 679 extern int tty_port_block_til_ready(struct tty_port *port, 680 struct tty_struct *tty, struct file *filp); 681 extern int tty_port_close_start(struct tty_port *port, 682 struct tty_struct *tty, struct file *filp); 683 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); 684 extern void tty_port_close(struct tty_port *port, 685 struct tty_struct *tty, struct file *filp); 686 extern int tty_port_install(struct tty_port *port, struct tty_driver *driver, 687 struct tty_struct *tty); 688 extern int tty_port_open(struct tty_port *port, 689 struct tty_struct *tty, struct file *filp); 690 static inline int tty_port_users(struct tty_port *port) 691 { 692 return port->count + port->blocked_open; 693 } 694 695 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); 696 extern int tty_unregister_ldisc(int disc); 697 extern int tty_set_ldisc(struct tty_struct *tty, int disc); 698 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); 699 extern void tty_ldisc_release(struct tty_struct *tty); 700 extern void tty_ldisc_init(struct tty_struct *tty); 701 extern void tty_ldisc_deinit(struct tty_struct *tty); 702 extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p, 703 char *f, int count); 704 705 /* n_tty.c */ 706 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); 707 #ifdef CONFIG_TTY 708 extern void __init n_tty_init(void); 709 #else 710 static inline void n_tty_init(void) { } 711 #endif 712 713 /* tty_audit.c */ 714 #ifdef CONFIG_AUDIT 715 extern void tty_audit_add_data(struct tty_struct *tty, const void *data, 716 size_t size); 717 extern void tty_audit_exit(void); 718 extern void tty_audit_fork(struct signal_struct *sig); 719 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); 720 extern int tty_audit_push(void); 721 #else 722 static inline void tty_audit_add_data(struct tty_struct *tty, const void *data, 723 size_t size) 724 { 725 } 726 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) 727 { 728 } 729 static inline void tty_audit_exit(void) 730 { 731 } 732 static inline void tty_audit_fork(struct signal_struct *sig) 733 { 734 } 735 static inline int tty_audit_push(void) 736 { 737 return 0; 738 } 739 #endif 740 741 /* tty_ioctl.c */ 742 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, 743 unsigned int cmd, unsigned long arg); 744 extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, 745 unsigned int cmd, unsigned long arg); 746 747 /* vt.c */ 748 749 extern int vt_ioctl(struct tty_struct *tty, 750 unsigned int cmd, unsigned long arg); 751 752 extern long vt_compat_ioctl(struct tty_struct *tty, 753 unsigned int cmd, unsigned long arg); 754 755 /* tty_mutex.c */ 756 /* functions for preparation of BKL removal */ 757 extern void tty_lock(struct tty_struct *tty); 758 extern int tty_lock_interruptible(struct tty_struct *tty); 759 extern void tty_unlock(struct tty_struct *tty); 760 extern void tty_lock_slave(struct tty_struct *tty); 761 extern void tty_unlock_slave(struct tty_struct *tty); 762 extern void tty_set_lock_subclass(struct tty_struct *tty); 763 764 #ifdef CONFIG_PROC_FS 765 extern void proc_tty_register_driver(struct tty_driver *); 766 extern void proc_tty_unregister_driver(struct tty_driver *); 767 #else 768 static inline void proc_tty_register_driver(struct tty_driver *d) {} 769 static inline void proc_tty_unregister_driver(struct tty_driver *d) {} 770 #endif 771 772 #define tty_msg(fn, tty, f, ...) \ 773 fn("%s %s: " f, tty_driver_name(tty), tty_name(tty), ##__VA_ARGS__) 774 775 #define tty_debug(tty, f, ...) tty_msg(pr_debug, tty, f, ##__VA_ARGS__) 776 #define tty_info(tty, f, ...) tty_msg(pr_info, tty, f, ##__VA_ARGS__) 777 #define tty_notice(tty, f, ...) tty_msg(pr_notice, tty, f, ##__VA_ARGS__) 778 #define tty_warn(tty, f, ...) tty_msg(pr_warn, tty, f, ##__VA_ARGS__) 779 #define tty_err(tty, f, ...) tty_msg(pr_err, tty, f, ##__VA_ARGS__) 780 781 #define tty_info_ratelimited(tty, f, ...) \ 782 tty_msg(pr_info_ratelimited, tty, f, ##__VA_ARGS__) 783 784 #endif 785