1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_TTY_H 3 #define _LINUX_TTY_H 4 5 #include <linux/fs.h> 6 #include <linux/major.h> 7 #include <linux/termios.h> 8 #include <linux/workqueue.h> 9 #include <linux/tty_buffer.h> 10 #include <linux/tty_driver.h> 11 #include <linux/tty_ldisc.h> 12 #include <linux/mutex.h> 13 #include <linux/tty_flags.h> 14 #include <uapi/linux/tty.h> 15 #include <linux/rwsem.h> 16 #include <linux/llist.h> 17 18 19 /* 20 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are 21 * hardcoded at present.) 22 */ 23 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ 24 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */ 25 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ 26 27 /* 28 * This character is the same as _POSIX_VDISABLE: it cannot be used as 29 * a c_cc[] character, but indicates that a particular special character 30 * isn't in use (eg VINTR has no character etc) 31 */ 32 #define __DISABLED_CHAR '\0' 33 34 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR]) 35 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT]) 36 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE]) 37 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL]) 38 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF]) 39 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME]) 40 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN]) 41 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC]) 42 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART]) 43 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP]) 44 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP]) 45 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL]) 46 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT]) 47 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD]) 48 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE]) 49 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT]) 50 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2]) 51 52 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f)) 53 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f)) 54 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f)) 55 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f)) 56 57 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK) 58 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT) 59 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR) 60 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK) 61 #define I_INPCK(tty) _I_FLAG((tty), INPCK) 62 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP) 63 #define I_INLCR(tty) _I_FLAG((tty), INLCR) 64 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR) 65 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL) 66 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC) 67 #define I_IXON(tty) _I_FLAG((tty), IXON) 68 #define I_IXANY(tty) _I_FLAG((tty), IXANY) 69 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF) 70 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL) 71 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8) 72 73 #define O_OPOST(tty) _O_FLAG((tty), OPOST) 74 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC) 75 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR) 76 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL) 77 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR) 78 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET) 79 #define O_OFILL(tty) _O_FLAG((tty), OFILL) 80 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL) 81 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY) 82 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY) 83 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY) 84 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY) 85 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY) 86 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY) 87 88 #define C_BAUD(tty) _C_FLAG((tty), CBAUD) 89 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE) 90 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB) 91 #define C_CREAD(tty) _C_FLAG((tty), CREAD) 92 #define C_PARENB(tty) _C_FLAG((tty), PARENB) 93 #define C_PARODD(tty) _C_FLAG((tty), PARODD) 94 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL) 95 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL) 96 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD) 97 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS) 98 #define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR) 99 100 #define L_ISIG(tty) _L_FLAG((tty), ISIG) 101 #define L_ICANON(tty) _L_FLAG((tty), ICANON) 102 #define L_XCASE(tty) _L_FLAG((tty), XCASE) 103 #define L_ECHO(tty) _L_FLAG((tty), ECHO) 104 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE) 105 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK) 106 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL) 107 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH) 108 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP) 109 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL) 110 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT) 111 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE) 112 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO) 113 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN) 114 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN) 115 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC) 116 117 struct device; 118 struct signal_struct; 119 120 /* 121 * Port level information. Each device keeps its own port level information 122 * so provide a common structure for those ports wanting to use common support 123 * routines. 124 * 125 * The tty port has a different lifetime to the tty so must be kept apart. 126 * In addition be careful as tty -> port mappings are valid for the life 127 * of the tty object but in many cases port -> tty mappings are valid only 128 * until a hangup so don't use the wrong path. 129 */ 130 131 struct tty_port; 132 133 struct tty_port_operations { 134 /* Return 1 if the carrier is raised */ 135 int (*carrier_raised)(struct tty_port *port); 136 /* Control the DTR line */ 137 void (*dtr_rts)(struct tty_port *port, int raise); 138 /* Called when the last close completes or a hangup finishes 139 IFF the port was initialized. Do not use to free resources. Called 140 under the port mutex to serialize against activate/shutdowns */ 141 void (*shutdown)(struct tty_port *port); 142 /* Called under the port mutex from tty_port_open, serialized using 143 the port mutex */ 144 /* FIXME: long term getting the tty argument *out* of this would be 145 good for consoles */ 146 int (*activate)(struct tty_port *port, struct tty_struct *tty); 147 /* Called on the final put of a port */ 148 void (*destruct)(struct tty_port *port); 149 }; 150 151 struct tty_port_client_operations { 152 int (*receive_buf)(struct tty_port *port, const unsigned char *, const unsigned char *, size_t); 153 void (*write_wakeup)(struct tty_port *port); 154 }; 155 156 extern const struct tty_port_client_operations tty_port_default_client_ops; 157 158 struct tty_port { 159 struct tty_bufhead buf; /* Locked internally */ 160 struct tty_struct *tty; /* Back pointer */ 161 struct tty_struct *itty; /* internal back ptr */ 162 const struct tty_port_operations *ops; /* Port operations */ 163 const struct tty_port_client_operations *client_ops; /* Port client operations */ 164 spinlock_t lock; /* Lock protecting tty field */ 165 int blocked_open; /* Waiting to open */ 166 int count; /* Usage count */ 167 wait_queue_head_t open_wait; /* Open waiters */ 168 wait_queue_head_t delta_msr_wait; /* Modem status change */ 169 unsigned long flags; /* User TTY flags ASYNC_ */ 170 unsigned long iflags; /* Internal flags TTY_PORT_ */ 171 unsigned char console:1; /* port is a console */ 172 struct mutex mutex; /* Locking */ 173 struct mutex buf_mutex; /* Buffer alloc lock */ 174 unsigned char *xmit_buf; /* Optional buffer */ 175 unsigned int close_delay; /* Close port delay */ 176 unsigned int closing_wait; /* Delay for output */ 177 int drain_delay; /* Set to zero if no pure time 178 based drain is needed else 179 set to size of fifo */ 180 struct kref kref; /* Ref counter */ 181 void *client_data; 182 }; 183 184 /* tty_port::iflags bits -- use atomic bit ops */ 185 #define TTY_PORT_INITIALIZED 0 /* device is initialized */ 186 #define TTY_PORT_SUSPENDED 1 /* device is suspended */ 187 #define TTY_PORT_ACTIVE 2 /* device is open */ 188 189 /* 190 * uart drivers: use the uart_port::status field and the UPSTAT_* defines 191 * for s/w-based flow control steering and carrier detection status 192 */ 193 #define TTY_PORT_CTS_FLOW 3 /* h/w flow control enabled */ 194 #define TTY_PORT_CHECK_CD 4 /* carrier detect enabled */ 195 #define TTY_PORT_KOPENED 5 /* device exclusively opened by 196 kernel */ 197 198 struct tty_operations; 199 200 /** 201 * struct tty_struct - state associated with a tty while open 202 * 203 * @flow.lock: lock for flow members 204 * @flow.stopped: tty stopped/started by tty_stop/tty_start 205 * @flow.tco_stopped: tty stopped/started by TCOOFF/TCOON ioctls (it has 206 * precedense over @flow.stopped) 207 * @flow.unused: alignment for Alpha, so that no members other than @flow.* are 208 * modified by the same 64b word store. The @flow's __aligned is 209 * there for the very same reason. 210 * @ctrl.lock: lock for ctrl members 211 * @ctrl.pgrp: process group of this tty (setpgrp(2)) 212 * @ctrl.session: session of this tty (setsid(2)). Writes are protected by both 213 * @ctrl.lock and legacy mutex, readers must use at least one of 214 * them. 215 * @ctrl.pktstatus: packet mode status (bitwise OR of TIOCPKT_* constants) 216 * @ctrl.packet: packet mode enabled 217 * 218 * All of the state associated with a tty while the tty is open. Persistent 219 * storage for tty devices is referenced here as @port in struct tty_port. 220 */ 221 struct tty_struct { 222 int magic; 223 struct kref kref; 224 struct device *dev; /* class device or NULL (e.g. ptys, serdev) */ 225 struct tty_driver *driver; 226 const struct tty_operations *ops; 227 int index; 228 229 /* Protects ldisc changes: Lock tty not pty */ 230 struct ld_semaphore ldisc_sem; 231 struct tty_ldisc *ldisc; 232 233 struct mutex atomic_write_lock; 234 struct mutex legacy_mutex; 235 struct mutex throttle_mutex; 236 struct rw_semaphore termios_rwsem; 237 struct mutex winsize_mutex; 238 /* Termios values are protected by the termios rwsem */ 239 struct ktermios termios, termios_locked; 240 char name[64]; 241 unsigned long flags; 242 int count; 243 struct winsize winsize; /* winsize_mutex */ 244 245 struct { 246 spinlock_t lock; 247 bool stopped; 248 bool tco_stopped; 249 unsigned long unused[0]; 250 } __aligned(sizeof(unsigned long)) flow; 251 252 struct { 253 spinlock_t lock; 254 struct pid *pgrp; 255 struct pid *session; 256 unsigned char pktstatus; 257 bool packet; 258 unsigned long unused[0]; 259 } __aligned(sizeof(unsigned long)) ctrl; 260 261 int hw_stopped; 262 unsigned int receive_room; /* Bytes free for queue */ 263 int flow_change; 264 265 struct tty_struct *link; 266 struct fasync_struct *fasync; 267 wait_queue_head_t write_wait; 268 wait_queue_head_t read_wait; 269 struct work_struct hangup_work; 270 void *disc_data; 271 void *driver_data; 272 spinlock_t files_lock; /* protects tty_files list */ 273 struct list_head tty_files; 274 275 #define N_TTY_BUF_SIZE 4096 276 277 int closing; 278 unsigned char *write_buf; 279 int write_cnt; 280 /* If the tty has a pending do_SAK, queue it here - akpm */ 281 struct work_struct SAK_work; 282 struct tty_port *port; 283 } __randomize_layout; 284 285 /* Each of a tty's open files has private_data pointing to tty_file_private */ 286 struct tty_file_private { 287 struct tty_struct *tty; 288 struct file *file; 289 struct list_head list; 290 }; 291 292 /* tty magic number */ 293 #define TTY_MAGIC 0x5401 294 295 /* 296 * These bits are used in the flags field of the tty structure. 297 * 298 * So that interrupts won't be able to mess up the queues, 299 * copy_to_cooked must be atomic with respect to itself, as must 300 * tty->write. Thus, you must use the inline functions set_bit() and 301 * clear_bit() to make things atomic. 302 */ 303 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ 304 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */ 305 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ 306 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */ 307 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ 308 #define TTY_LDISC_OPEN 11 /* Line discipline is open */ 309 #define TTY_PTY_LOCK 16 /* pty private */ 310 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ 311 #define TTY_HUPPED 18 /* Post driver->hangup() */ 312 #define TTY_HUPPING 19 /* Hangup in progress */ 313 #define TTY_LDISC_CHANGING 20 /* Change pending - non-block IO */ 314 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */ 315 316 static inline bool tty_io_nonblock(struct tty_struct *tty, struct file *file) 317 { 318 return file->f_flags & O_NONBLOCK || 319 test_bit(TTY_LDISC_CHANGING, &tty->flags); 320 } 321 322 static inline bool tty_io_error(struct tty_struct *tty) 323 { 324 return test_bit(TTY_IO_ERROR, &tty->flags); 325 } 326 327 static inline bool tty_throttled(struct tty_struct *tty) 328 { 329 return test_bit(TTY_THROTTLED, &tty->flags); 330 } 331 332 #ifdef CONFIG_TTY 333 extern void tty_kref_put(struct tty_struct *tty); 334 extern struct pid *tty_get_pgrp(struct tty_struct *tty); 335 extern void tty_vhangup_self(void); 336 extern void disassociate_ctty(int priv); 337 extern dev_t tty_devnum(struct tty_struct *tty); 338 extern void proc_clear_tty(struct task_struct *p); 339 extern struct tty_struct *get_current_tty(void); 340 /* tty_io.c */ 341 extern int __init tty_init(void); 342 extern const char *tty_name(const struct tty_struct *tty); 343 extern struct tty_struct *tty_kopen_exclusive(dev_t device); 344 extern struct tty_struct *tty_kopen_shared(dev_t device); 345 extern void tty_kclose(struct tty_struct *tty); 346 extern int tty_dev_name_to_number(const char *name, dev_t *number); 347 #else 348 static inline void tty_kref_put(struct tty_struct *tty) 349 { } 350 static inline struct pid *tty_get_pgrp(struct tty_struct *tty) 351 { return NULL; } 352 static inline void tty_vhangup_self(void) 353 { } 354 static inline void disassociate_ctty(int priv) 355 { } 356 static inline dev_t tty_devnum(struct tty_struct *tty) 357 { return 0; } 358 static inline void proc_clear_tty(struct task_struct *p) 359 { } 360 static inline struct tty_struct *get_current_tty(void) 361 { return NULL; } 362 /* tty_io.c */ 363 static inline int __init tty_init(void) 364 { return 0; } 365 static inline const char *tty_name(const struct tty_struct *tty) 366 { return "(none)"; } 367 static inline struct tty_struct *tty_kopen_exclusive(dev_t device) 368 { return ERR_PTR(-ENODEV); } 369 static inline void tty_kclose(struct tty_struct *tty) 370 { } 371 static inline int tty_dev_name_to_number(const char *name, dev_t *number) 372 { return -ENOTSUPP; } 373 #endif 374 375 extern struct ktermios tty_std_termios; 376 377 extern int vcs_init(void); 378 379 extern struct class *tty_class; 380 381 /** 382 * tty_kref_get - get a tty reference 383 * @tty: tty device 384 * 385 * Return a new reference to a tty object. The caller must hold 386 * sufficient locks/counts to ensure that their existing reference cannot 387 * go away 388 */ 389 390 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) 391 { 392 if (tty) 393 kref_get(&tty->kref); 394 return tty; 395 } 396 397 extern const char *tty_driver_name(const struct tty_struct *tty); 398 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); 399 extern void stop_tty(struct tty_struct *tty); 400 extern void start_tty(struct tty_struct *tty); 401 extern void tty_write_message(struct tty_struct *tty, char *msg); 402 extern int tty_send_xchar(struct tty_struct *tty, char ch); 403 extern int tty_put_char(struct tty_struct *tty, unsigned char c); 404 extern unsigned int tty_chars_in_buffer(struct tty_struct *tty); 405 extern unsigned int tty_write_room(struct tty_struct *tty); 406 extern void tty_driver_flush_buffer(struct tty_struct *tty); 407 extern void tty_unthrottle(struct tty_struct *tty); 408 extern int tty_throttle_safe(struct tty_struct *tty); 409 extern int tty_unthrottle_safe(struct tty_struct *tty); 410 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); 411 extern int tty_get_icount(struct tty_struct *tty, 412 struct serial_icounter_struct *icount); 413 extern int is_current_pgrp_orphaned(void); 414 extern void tty_hangup(struct tty_struct *tty); 415 extern void tty_vhangup(struct tty_struct *tty); 416 extern int tty_hung_up_p(struct file *filp); 417 extern void do_SAK(struct tty_struct *tty); 418 extern void __do_SAK(struct tty_struct *tty); 419 extern void no_tty(void); 420 extern speed_t tty_termios_baud_rate(struct ktermios *termios); 421 extern void tty_termios_encode_baud_rate(struct ktermios *termios, 422 speed_t ibaud, speed_t obaud); 423 extern void tty_encode_baud_rate(struct tty_struct *tty, 424 speed_t ibaud, speed_t obaud); 425 426 /** 427 * tty_get_baud_rate - get tty bit rates 428 * @tty: tty to query 429 * 430 * Returns the baud rate as an integer for this terminal. The 431 * termios lock must be held by the caller and the terminal bit 432 * flags may be updated. 433 * 434 * Locking: none 435 */ 436 static inline speed_t tty_get_baud_rate(struct tty_struct *tty) 437 { 438 return tty_termios_baud_rate(&tty->termios); 439 } 440 441 unsigned char tty_get_char_size(unsigned int cflag); 442 unsigned char tty_get_frame_size(unsigned int cflag); 443 444 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); 445 extern int tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b); 446 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt); 447 448 extern void tty_wakeup(struct tty_struct *tty); 449 450 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, 451 unsigned int cmd, unsigned long arg); 452 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); 453 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx); 454 extern void tty_release_struct(struct tty_struct *tty, int idx); 455 extern void tty_init_termios(struct tty_struct *tty); 456 extern void tty_save_termios(struct tty_struct *tty); 457 extern int tty_standard_install(struct tty_driver *driver, 458 struct tty_struct *tty); 459 460 extern struct mutex tty_mutex; 461 462 extern void tty_port_init(struct tty_port *port); 463 extern void tty_port_link_device(struct tty_port *port, 464 struct tty_driver *driver, unsigned index); 465 extern struct device *tty_port_register_device(struct tty_port *port, 466 struct tty_driver *driver, unsigned index, 467 struct device *device); 468 extern struct device *tty_port_register_device_attr(struct tty_port *port, 469 struct tty_driver *driver, unsigned index, 470 struct device *device, void *drvdata, 471 const struct attribute_group **attr_grp); 472 extern struct device *tty_port_register_device_serdev(struct tty_port *port, 473 struct tty_driver *driver, unsigned index, 474 struct device *device); 475 extern struct device *tty_port_register_device_attr_serdev(struct tty_port *port, 476 struct tty_driver *driver, unsigned index, 477 struct device *device, void *drvdata, 478 const struct attribute_group **attr_grp); 479 extern void tty_port_unregister_device(struct tty_port *port, 480 struct tty_driver *driver, unsigned index); 481 extern int tty_port_alloc_xmit_buf(struct tty_port *port); 482 extern void tty_port_free_xmit_buf(struct tty_port *port); 483 extern void tty_port_destroy(struct tty_port *port); 484 extern void tty_port_put(struct tty_port *port); 485 486 static inline struct tty_port *tty_port_get(struct tty_port *port) 487 { 488 if (port && kref_get_unless_zero(&port->kref)) 489 return port; 490 return NULL; 491 } 492 493 /* If the cts flow control is enabled, return true. */ 494 static inline bool tty_port_cts_enabled(const struct tty_port *port) 495 { 496 return test_bit(TTY_PORT_CTS_FLOW, &port->iflags); 497 } 498 499 static inline void tty_port_set_cts_flow(struct tty_port *port, bool val) 500 { 501 assign_bit(TTY_PORT_CTS_FLOW, &port->iflags, val); 502 } 503 504 static inline bool tty_port_active(const struct tty_port *port) 505 { 506 return test_bit(TTY_PORT_ACTIVE, &port->iflags); 507 } 508 509 static inline void tty_port_set_active(struct tty_port *port, bool val) 510 { 511 assign_bit(TTY_PORT_ACTIVE, &port->iflags, val); 512 } 513 514 static inline bool tty_port_check_carrier(const struct tty_port *port) 515 { 516 return test_bit(TTY_PORT_CHECK_CD, &port->iflags); 517 } 518 519 static inline void tty_port_set_check_carrier(struct tty_port *port, bool val) 520 { 521 assign_bit(TTY_PORT_CHECK_CD, &port->iflags, val); 522 } 523 524 static inline bool tty_port_suspended(const struct tty_port *port) 525 { 526 return test_bit(TTY_PORT_SUSPENDED, &port->iflags); 527 } 528 529 static inline void tty_port_set_suspended(struct tty_port *port, bool val) 530 { 531 assign_bit(TTY_PORT_SUSPENDED, &port->iflags, val); 532 } 533 534 static inline bool tty_port_initialized(const struct tty_port *port) 535 { 536 return test_bit(TTY_PORT_INITIALIZED, &port->iflags); 537 } 538 539 static inline void tty_port_set_initialized(struct tty_port *port, bool val) 540 { 541 assign_bit(TTY_PORT_INITIALIZED, &port->iflags, val); 542 } 543 544 static inline bool tty_port_kopened(const struct tty_port *port) 545 { 546 return test_bit(TTY_PORT_KOPENED, &port->iflags); 547 } 548 549 static inline void tty_port_set_kopened(struct tty_port *port, bool val) 550 { 551 assign_bit(TTY_PORT_KOPENED, &port->iflags, val); 552 } 553 554 extern struct tty_struct *tty_port_tty_get(struct tty_port *port); 555 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); 556 extern int tty_port_carrier_raised(struct tty_port *port); 557 extern void tty_port_raise_dtr_rts(struct tty_port *port); 558 extern void tty_port_lower_dtr_rts(struct tty_port *port); 559 extern void tty_port_hangup(struct tty_port *port); 560 extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal); 561 extern void tty_port_tty_wakeup(struct tty_port *port); 562 extern int tty_port_block_til_ready(struct tty_port *port, 563 struct tty_struct *tty, struct file *filp); 564 extern int tty_port_close_start(struct tty_port *port, 565 struct tty_struct *tty, struct file *filp); 566 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); 567 extern void tty_port_close(struct tty_port *port, 568 struct tty_struct *tty, struct file *filp); 569 extern int tty_port_install(struct tty_port *port, struct tty_driver *driver, 570 struct tty_struct *tty); 571 extern int tty_port_open(struct tty_port *port, 572 struct tty_struct *tty, struct file *filp); 573 static inline int tty_port_users(struct tty_port *port) 574 { 575 return port->count + port->blocked_open; 576 } 577 578 /* n_tty.c */ 579 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); 580 #ifdef CONFIG_TTY 581 extern void __init n_tty_init(void); 582 #else 583 static inline void n_tty_init(void) { } 584 #endif 585 586 /* tty_audit.c */ 587 #ifdef CONFIG_AUDIT 588 extern void tty_audit_exit(void); 589 extern void tty_audit_fork(struct signal_struct *sig); 590 extern int tty_audit_push(void); 591 #else 592 static inline void tty_audit_exit(void) 593 { 594 } 595 static inline void tty_audit_fork(struct signal_struct *sig) 596 { 597 } 598 static inline int tty_audit_push(void) 599 { 600 return 0; 601 } 602 #endif 603 604 /* tty_ioctl.c */ 605 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, 606 unsigned int cmd, unsigned long arg); 607 608 /* vt.c */ 609 610 extern int vt_ioctl(struct tty_struct *tty, 611 unsigned int cmd, unsigned long arg); 612 613 extern long vt_compat_ioctl(struct tty_struct *tty, 614 unsigned int cmd, unsigned long arg); 615 616 /* tty_mutex.c */ 617 /* functions for preparation of BKL removal */ 618 extern void tty_lock(struct tty_struct *tty); 619 extern int tty_lock_interruptible(struct tty_struct *tty); 620 extern void tty_unlock(struct tty_struct *tty); 621 extern void tty_lock_slave(struct tty_struct *tty); 622 extern void tty_unlock_slave(struct tty_struct *tty); 623 extern void tty_set_lock_subclass(struct tty_struct *tty); 624 625 #endif 626