tty.h revision 136d5258b2bc4ffae99cb69874a76624c26fbfad
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/* 19 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are 20 * hardcoded at present.) 21 */ 22#define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ 23#define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */ 24#define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ 25 26/* 27 * This character is the same as _POSIX_VDISABLE: it cannot be used as 28 * a c_cc[] character, but indicates that a particular special character 29 * isn't in use (eg VINTR has no character etc) 30 */ 31#define __DISABLED_CHAR '\0' 32 33struct tty_buffer { 34 union { 35 struct tty_buffer *next; 36 struct llist_node free; 37 }; 38 int used; 39 int size; 40 int commit; 41 int read; 42 int flags; 43 /* Data points here */ 44 unsigned long data[0]; 45}; 46 47/* Values for .flags field of tty_buffer */ 48#define TTYB_NORMAL 1 /* buffer has no flags buffer */ 49 50static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs) 51{ 52 return ((unsigned char *)b->data) + ofs; 53} 54 55static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs) 56{ 57 return (char *)char_buf_ptr(b, ofs) + b->size; 58} 59 60struct tty_bufhead { 61 struct tty_buffer *head; /* Queue head */ 62 struct work_struct work; 63 struct mutex lock; 64 atomic_t priority; 65 struct tty_buffer sentinel; 66 struct llist_head free; /* Free queue head */ 67 atomic_t mem_used; /* In-use buffers excluding free list */ 68 int mem_limit; 69 struct tty_buffer *tail; /* Active buffer */ 70}; 71/* 72 * When a break, frame error, or parity error happens, these codes are 73 * stuffed into the flags buffer. 74 */ 75#define TTY_NORMAL 0 76#define TTY_BREAK 1 77#define TTY_FRAME 2 78#define TTY_PARITY 3 79#define TTY_OVERRUN 4 80 81#define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR]) 82#define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT]) 83#define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE]) 84#define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL]) 85#define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF]) 86#define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME]) 87#define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN]) 88#define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC]) 89#define START_CHAR(tty) ((tty)->termios.c_cc[VSTART]) 90#define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP]) 91#define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP]) 92#define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL]) 93#define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT]) 94#define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD]) 95#define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE]) 96#define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT]) 97#define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2]) 98 99#define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f)) 100#define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f)) 101#define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f)) 102#define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f)) 103 104#define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK) 105#define I_BRKINT(tty) _I_FLAG((tty), BRKINT) 106#define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR) 107#define I_PARMRK(tty) _I_FLAG((tty), PARMRK) 108#define I_INPCK(tty) _I_FLAG((tty), INPCK) 109#define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP) 110#define I_INLCR(tty) _I_FLAG((tty), INLCR) 111#define I_IGNCR(tty) _I_FLAG((tty), IGNCR) 112#define I_ICRNL(tty) _I_FLAG((tty), ICRNL) 113#define I_IUCLC(tty) _I_FLAG((tty), IUCLC) 114#define I_IXON(tty) _I_FLAG((tty), IXON) 115#define I_IXANY(tty) _I_FLAG((tty), IXANY) 116#define I_IXOFF(tty) _I_FLAG((tty), IXOFF) 117#define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL) 118#define I_IUTF8(tty) _I_FLAG((tty), IUTF8) 119 120#define O_OPOST(tty) _O_FLAG((tty), OPOST) 121#define O_OLCUC(tty) _O_FLAG((tty), OLCUC) 122#define O_ONLCR(tty) _O_FLAG((tty), ONLCR) 123#define O_OCRNL(tty) _O_FLAG((tty), OCRNL) 124#define O_ONOCR(tty) _O_FLAG((tty), ONOCR) 125#define O_ONLRET(tty) _O_FLAG((tty), ONLRET) 126#define O_OFILL(tty) _O_FLAG((tty), OFILL) 127#define O_OFDEL(tty) _O_FLAG((tty), OFDEL) 128#define O_NLDLY(tty) _O_FLAG((tty), NLDLY) 129#define O_CRDLY(tty) _O_FLAG((tty), CRDLY) 130#define O_TABDLY(tty) _O_FLAG((tty), TABDLY) 131#define O_BSDLY(tty) _O_FLAG((tty), BSDLY) 132#define O_VTDLY(tty) _O_FLAG((tty), VTDLY) 133#define O_FFDLY(tty) _O_FLAG((tty), FFDLY) 134 135#define C_BAUD(tty) _C_FLAG((tty), CBAUD) 136#define C_CSIZE(tty) _C_FLAG((tty), CSIZE) 137#define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB) 138#define C_CREAD(tty) _C_FLAG((tty), CREAD) 139#define C_PARENB(tty) _C_FLAG((tty), PARENB) 140#define C_PARODD(tty) _C_FLAG((tty), PARODD) 141#define C_HUPCL(tty) _C_FLAG((tty), HUPCL) 142#define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL) 143#define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD) 144#define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS) 145#define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR) 146 147#define L_ISIG(tty) _L_FLAG((tty), ISIG) 148#define L_ICANON(tty) _L_FLAG((tty), ICANON) 149#define L_XCASE(tty) _L_FLAG((tty), XCASE) 150#define L_ECHO(tty) _L_FLAG((tty), ECHO) 151#define L_ECHOE(tty) _L_FLAG((tty), ECHOE) 152#define L_ECHOK(tty) _L_FLAG((tty), ECHOK) 153#define L_ECHONL(tty) _L_FLAG((tty), ECHONL) 154#define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH) 155#define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP) 156#define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL) 157#define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT) 158#define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE) 159#define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO) 160#define L_PENDIN(tty) _L_FLAG((tty), PENDIN) 161#define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN) 162#define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC) 163 164struct device; 165struct signal_struct; 166 167/* 168 * Port level information. Each device keeps its own port level information 169 * so provide a common structure for those ports wanting to use common support 170 * routines. 171 * 172 * The tty port has a different lifetime to the tty so must be kept apart. 173 * In addition be careful as tty -> port mappings are valid for the life 174 * of the tty object but in many cases port -> tty mappings are valid only 175 * until a hangup so don't use the wrong path. 176 */ 177 178struct tty_port; 179 180struct tty_port_operations { 181 /* Return 1 if the carrier is raised */ 182 int (*carrier_raised)(struct tty_port *port); 183 /* Control the DTR line */ 184 void (*dtr_rts)(struct tty_port *port, int raise); 185 /* Called when the last close completes or a hangup finishes 186 IFF the port was initialized. Do not use to free resources. Called 187 under the port mutex to serialize against activate/shutdowns */ 188 void (*shutdown)(struct tty_port *port); 189 /* Called under the port mutex from tty_port_open, serialized using 190 the port mutex */ 191 /* FIXME: long term getting the tty argument *out* of this would be 192 good for consoles */ 193 int (*activate)(struct tty_port *port, struct tty_struct *tty); 194 /* Called on the final put of a port */ 195 void (*destruct)(struct tty_port *port); 196}; 197 198struct tty_port { 199 struct tty_bufhead buf; /* Locked internally */ 200 struct tty_struct *tty; /* Back pointer */ 201 struct tty_struct *itty; /* internal back ptr */ 202 const struct tty_port_operations *ops; /* Port operations */ 203 spinlock_t lock; /* Lock protecting tty field */ 204 int blocked_open; /* Waiting to open */ 205 int count; /* Usage count */ 206 wait_queue_head_t open_wait; /* Open waiters */ 207 wait_queue_head_t close_wait; /* Close waiters */ 208 wait_queue_head_t delta_msr_wait; /* Modem status change */ 209 unsigned long flags; /* TTY flags ASY_*/ 210 unsigned char console:1, /* port is a console */ 211 low_latency:1; /* optional: tune for latency */ 212 struct mutex mutex; /* Locking */ 213 struct mutex buf_mutex; /* Buffer alloc lock */ 214 unsigned char *xmit_buf; /* Optional buffer */ 215 unsigned int close_delay; /* Close port delay */ 216 unsigned int closing_wait; /* Delay for output */ 217 int drain_delay; /* Set to zero if no pure time 218 based drain is needed else 219 set to size of fifo */ 220 struct kref kref; /* Ref counter */ 221}; 222 223/* 224 * Where all of the state associated with a tty is kept while the tty 225 * is open. Since the termios state should be kept even if the tty 226 * has been closed --- for things like the baud rate, etc --- it is 227 * not stored here, but rather a pointer to the real state is stored 228 * here. Possible the winsize structure should have the same 229 * treatment, but (1) the default 80x24 is usually right and (2) it's 230 * most often used by a windowing system, which will set the correct 231 * size each time the window is created or resized anyway. 232 * - TYT, 9/14/92 233 */ 234 235struct tty_operations; 236 237struct tty_struct { 238 int magic; 239 struct kref kref; 240 struct device *dev; 241 struct tty_driver *driver; 242 const struct tty_operations *ops; 243 int index; 244 245 /* Protects ldisc changes: Lock tty not pty */ 246 struct ld_semaphore ldisc_sem; 247 struct tty_ldisc *ldisc; 248 249 struct mutex atomic_write_lock; 250 struct mutex legacy_mutex; 251 struct mutex throttle_mutex; 252 struct rw_semaphore termios_rwsem; 253 struct mutex winsize_mutex; 254 spinlock_t ctrl_lock; 255 spinlock_t flow_lock; 256 /* Termios values are protected by the termios rwsem */ 257 struct ktermios termios, termios_locked; 258 struct termiox *termiox; /* May be NULL for unsupported */ 259 char name[64]; 260 struct pid *pgrp; /* Protected by ctrl lock */ 261 struct pid *session; 262 unsigned long flags; 263 int count; 264 struct winsize winsize; /* winsize_mutex */ 265 unsigned long stopped:1, /* flow_lock */ 266 flow_stopped:1, 267 unused:62; 268 int hw_stopped; 269 int packet; 270 unsigned char ctrl_status; /* ctrl_lock */ 271 unsigned int receive_room; /* Bytes free for queue */ 272 int flow_change; 273 274 struct tty_struct *link; 275 struct fasync_struct *fasync; 276 int alt_speed; /* For magic substitution of 38400 bps */ 277 wait_queue_head_t write_wait; 278 wait_queue_head_t read_wait; 279 struct work_struct hangup_work; 280 void *disc_data; 281 void *driver_data; 282 struct list_head tty_files; 283 284#define N_TTY_BUF_SIZE 4096 285 286 unsigned char closing:1; 287 unsigned char *write_buf; 288 int write_cnt; 289 /* If the tty has a pending do_SAK, queue it here - akpm */ 290 struct work_struct SAK_work; 291 struct tty_port *port; 292}; 293 294/* Each of a tty's open files has private_data pointing to tty_file_private */ 295struct tty_file_private { 296 struct tty_struct *tty; 297 struct file *file; 298 struct list_head list; 299}; 300 301/* tty magic number */ 302#define TTY_MAGIC 0x5401 303 304/* 305 * These bits are used in the flags field of the tty structure. 306 * 307 * So that interrupts won't be able to mess up the queues, 308 * copy_to_cooked must be atomic with respect to itself, as must 309 * tty->write. Thus, you must use the inline functions set_bit() and 310 * clear_bit() to make things atomic. 311 */ 312#define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ 313#define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */ 314#define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ 315#define TTY_EXCLUSIVE 3 /* Exclusive open mode */ 316#define TTY_DEBUG 4 /* Debugging */ 317#define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ 318#define TTY_CLOSING 7 /* ->close() in progress */ 319#define TTY_LDISC_OPEN 11 /* Line discipline is open */ 320#define TTY_PTY_LOCK 16 /* pty private */ 321#define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ 322#define TTY_HUPPED 18 /* Post driver->hangup() */ 323#define TTY_HUPPING 21 /* ->hangup() in progress */ 324#define TTY_LDISC_HALTED 22 /* Line discipline is halted */ 325 326#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty)) 327 328/* Values for tty->flow_change */ 329#define TTY_THROTTLE_SAFE 1 330#define TTY_UNTHROTTLE_SAFE 2 331 332static inline void __tty_set_flow_change(struct tty_struct *tty, int val) 333{ 334 tty->flow_change = val; 335} 336 337static inline void tty_set_flow_change(struct tty_struct *tty, int val) 338{ 339 tty->flow_change = val; 340 smp_mb(); 341} 342 343#ifdef CONFIG_TTY 344extern void console_init(void); 345extern void tty_kref_put(struct tty_struct *tty); 346extern struct pid *tty_get_pgrp(struct tty_struct *tty); 347extern void tty_vhangup_self(void); 348extern void disassociate_ctty(int priv); 349extern dev_t tty_devnum(struct tty_struct *tty); 350extern void proc_clear_tty(struct task_struct *p); 351extern struct tty_struct *get_current_tty(void); 352/* tty_io.c */ 353extern int __init tty_init(void); 354#else 355static inline void console_init(void) 356{ } 357static inline void tty_kref_put(struct tty_struct *tty) 358{ } 359static inline struct pid *tty_get_pgrp(struct tty_struct *tty) 360{ return NULL; } 361static inline void tty_vhangup_self(void) 362{ } 363static inline void disassociate_ctty(int priv) 364{ } 365static inline dev_t tty_devnum(struct tty_struct *tty) 366{ return 0; } 367static inline void proc_clear_tty(struct task_struct *p) 368{ } 369static inline struct tty_struct *get_current_tty(void) 370{ return NULL; } 371/* tty_io.c */ 372static inline int __init tty_init(void) 373{ return 0; } 374#endif 375 376extern void tty_write_flush(struct tty_struct *); 377 378extern struct ktermios tty_std_termios; 379 380extern int vcs_init(void); 381 382extern 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 393static 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 400extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, 401 const char *routine); 402extern char *tty_name(struct tty_struct *tty, char *buf); 403extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); 404extern int tty_check_change(struct tty_struct *tty); 405extern void __stop_tty(struct tty_struct *tty); 406extern void stop_tty(struct tty_struct *tty); 407extern void __start_tty(struct tty_struct *tty); 408extern void start_tty(struct tty_struct *tty); 409extern int tty_register_driver(struct tty_driver *driver); 410extern int tty_unregister_driver(struct tty_driver *driver); 411extern struct device *tty_register_device(struct tty_driver *driver, 412 unsigned index, struct device *dev); 413extern struct device *tty_register_device_attr(struct tty_driver *driver, 414 unsigned index, struct device *device, 415 void *drvdata, 416 const struct attribute_group **attr_grp); 417extern void tty_unregister_device(struct tty_driver *driver, unsigned index); 418extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp, 419 int buflen); 420extern void tty_write_message(struct tty_struct *tty, char *msg); 421extern int tty_send_xchar(struct tty_struct *tty, char ch); 422extern int tty_put_char(struct tty_struct *tty, unsigned char c); 423extern int tty_chars_in_buffer(struct tty_struct *tty); 424extern int tty_write_room(struct tty_struct *tty); 425extern void tty_driver_flush_buffer(struct tty_struct *tty); 426extern void tty_throttle(struct tty_struct *tty); 427extern void tty_unthrottle(struct tty_struct *tty); 428extern int tty_throttle_safe(struct tty_struct *tty); 429extern int tty_unthrottle_safe(struct tty_struct *tty); 430extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); 431extern void tty_driver_remove_tty(struct tty_driver *driver, 432 struct tty_struct *tty); 433extern void tty_free_termios(struct tty_struct *tty); 434extern int is_current_pgrp_orphaned(void); 435extern int is_ignored(int sig); 436extern int tty_signal(int sig, struct tty_struct *tty); 437extern void tty_hangup(struct tty_struct *tty); 438extern void tty_vhangup(struct tty_struct *tty); 439extern void tty_unhangup(struct file *filp); 440extern int tty_hung_up_p(struct file *filp); 441extern void do_SAK(struct tty_struct *tty); 442extern void __do_SAK(struct tty_struct *tty); 443extern void no_tty(void); 444extern void tty_flush_to_ldisc(struct tty_struct *tty); 445extern void tty_buffer_free_all(struct tty_port *port); 446extern void tty_buffer_flush(struct tty_struct *tty); 447extern void tty_buffer_init(struct tty_port *port); 448extern speed_t tty_termios_baud_rate(struct ktermios *termios); 449extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); 450extern void tty_termios_encode_baud_rate(struct ktermios *termios, 451 speed_t ibaud, speed_t obaud); 452extern void tty_encode_baud_rate(struct tty_struct *tty, 453 speed_t ibaud, speed_t obaud); 454 455/** 456 * tty_get_baud_rate - get tty bit rates 457 * @tty: tty to query 458 * 459 * Returns the baud rate as an integer for this terminal. The 460 * termios lock must be held by the caller and the terminal bit 461 * flags may be updated. 462 * 463 * Locking: none 464 */ 465static inline speed_t tty_get_baud_rate(struct tty_struct *tty) 466{ 467 return tty_termios_baud_rate(&tty->termios); 468} 469 470extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); 471extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b); 472extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt); 473 474extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); 475extern void tty_ldisc_deref(struct tty_ldisc *); 476extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); 477extern void tty_ldisc_hangup(struct tty_struct *tty); 478extern const struct file_operations tty_ldiscs_proc_fops; 479 480extern void tty_wakeup(struct tty_struct *tty); 481extern void tty_ldisc_flush(struct tty_struct *tty); 482 483extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 484extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, 485 unsigned int cmd, unsigned long arg); 486extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); 487extern void tty_default_fops(struct file_operations *fops); 488extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx); 489extern int tty_alloc_file(struct file *file); 490extern void tty_add_file(struct tty_struct *tty, struct file *file); 491extern void tty_free_file(struct file *file); 492extern void free_tty_struct(struct tty_struct *tty); 493extern void deinitialize_tty_struct(struct tty_struct *tty); 494extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx); 495extern int tty_release(struct inode *inode, struct file *filp); 496extern int tty_init_termios(struct tty_struct *tty); 497extern int tty_standard_install(struct tty_driver *driver, 498 struct tty_struct *tty); 499 500extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty); 501extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty); 502 503extern struct mutex tty_mutex; 504extern spinlock_t tty_files_lock; 505 506#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) 507 508extern void tty_port_init(struct tty_port *port); 509extern void tty_port_link_device(struct tty_port *port, 510 struct tty_driver *driver, unsigned index); 511extern struct device *tty_port_register_device(struct tty_port *port, 512 struct tty_driver *driver, unsigned index, 513 struct device *device); 514extern struct device *tty_port_register_device_attr(struct tty_port *port, 515 struct tty_driver *driver, unsigned index, 516 struct device *device, void *drvdata, 517 const struct attribute_group **attr_grp); 518extern int tty_port_alloc_xmit_buf(struct tty_port *port); 519extern void tty_port_free_xmit_buf(struct tty_port *port); 520extern void tty_port_destroy(struct tty_port *port); 521extern void tty_port_put(struct tty_port *port); 522 523static inline struct tty_port *tty_port_get(struct tty_port *port) 524{ 525 if (port && kref_get_unless_zero(&port->kref)) 526 return port; 527 return NULL; 528} 529 530/* If the cts flow control is enabled, return true. */ 531static inline bool tty_port_cts_enabled(struct tty_port *port) 532{ 533 return port->flags & ASYNC_CTS_FLOW; 534} 535 536extern struct tty_struct *tty_port_tty_get(struct tty_port *port); 537extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); 538extern int tty_port_carrier_raised(struct tty_port *port); 539extern void tty_port_raise_dtr_rts(struct tty_port *port); 540extern void tty_port_lower_dtr_rts(struct tty_port *port); 541extern void tty_port_hangup(struct tty_port *port); 542extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal); 543extern void tty_port_tty_wakeup(struct tty_port *port); 544extern int tty_port_block_til_ready(struct tty_port *port, 545 struct tty_struct *tty, struct file *filp); 546extern int tty_port_close_start(struct tty_port *port, 547 struct tty_struct *tty, struct file *filp); 548extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); 549extern void tty_port_close(struct tty_port *port, 550 struct tty_struct *tty, struct file *filp); 551extern int tty_port_install(struct tty_port *port, struct tty_driver *driver, 552 struct tty_struct *tty); 553extern int tty_port_open(struct tty_port *port, 554 struct tty_struct *tty, struct file *filp); 555static inline int tty_port_users(struct tty_port *port) 556{ 557 return port->count + port->blocked_open; 558} 559 560extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); 561extern int tty_unregister_ldisc(int disc); 562extern int tty_set_ldisc(struct tty_struct *tty, int ldisc); 563extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); 564extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty); 565extern void tty_ldisc_init(struct tty_struct *tty); 566extern void tty_ldisc_deinit(struct tty_struct *tty); 567extern void tty_ldisc_begin(void); 568 569static inline int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p, 570 char *f, int count) 571{ 572 if (ld->ops->receive_buf2) 573 count = ld->ops->receive_buf2(ld->tty, p, f, count); 574 else { 575 count = min_t(int, count, ld->tty->receive_room); 576 if (count) 577 ld->ops->receive_buf(ld->tty, p, f, count); 578 } 579 return count; 580} 581 582 583/* n_tty.c */ 584extern struct tty_ldisc_ops tty_ldisc_N_TTY; 585extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); 586 587/* tty_audit.c */ 588#ifdef CONFIG_AUDIT 589extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, 590 size_t size, unsigned icanon); 591extern void tty_audit_exit(void); 592extern void tty_audit_fork(struct signal_struct *sig); 593extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); 594extern void tty_audit_push(struct tty_struct *tty); 595extern int tty_audit_push_current(void); 596#else 597static inline void tty_audit_add_data(struct tty_struct *tty, 598 unsigned char *data, size_t size, unsigned icanon) 599{ 600} 601static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) 602{ 603} 604static inline void tty_audit_exit(void) 605{ 606} 607static inline void tty_audit_fork(struct signal_struct *sig) 608{ 609} 610static inline void tty_audit_push(struct tty_struct *tty) 611{ 612} 613static inline int tty_audit_push_current(void) 614{ 615 return 0; 616} 617#endif 618 619/* tty_ioctl.c */ 620extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, 621 unsigned int cmd, unsigned long arg); 622extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, 623 unsigned int cmd, unsigned long arg); 624 625/* serial.c */ 626 627extern void serial_console_init(void); 628 629/* pcxx.c */ 630 631extern int pcxe_open(struct tty_struct *tty, struct file *filp); 632 633/* vt.c */ 634 635extern int vt_ioctl(struct tty_struct *tty, 636 unsigned int cmd, unsigned long arg); 637 638extern long vt_compat_ioctl(struct tty_struct *tty, 639 unsigned int cmd, unsigned long arg); 640 641/* tty_mutex.c */ 642/* functions for preparation of BKL removal */ 643extern void __lockfunc tty_lock(struct tty_struct *tty); 644extern void __lockfunc tty_unlock(struct tty_struct *tty); 645extern void __lockfunc tty_lock_pair(struct tty_struct *tty, 646 struct tty_struct *tty2); 647extern void __lockfunc tty_unlock_pair(struct tty_struct *tty, 648 struct tty_struct *tty2); 649 650/* 651 * this shall be called only from where BTM is held (like close) 652 * 653 * We need this to ensure nobody waits for us to finish while we are waiting. 654 * Without this we were encountering system stalls. 655 * 656 * This should be indeed removed with BTM removal later. 657 * 658 * Locking: BTM required. Nobody is allowed to hold port->mutex. 659 */ 660static inline void tty_wait_until_sent_from_close(struct tty_struct *tty, 661 long timeout) 662{ 663 tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */ 664 tty_wait_until_sent(tty, timeout); 665 tty_lock(tty); 666} 667 668/* 669 * wait_event_interruptible_tty -- wait for a condition with the tty lock held 670 * 671 * The condition we are waiting for might take a long time to 672 * become true, or might depend on another thread taking the 673 * BTM. In either case, we need to drop the BTM to guarantee 674 * forward progress. This is a leftover from the conversion 675 * from the BKL and should eventually get removed as the BTM 676 * falls out of use. 677 * 678 * Do not use in new code. 679 */ 680#define wait_event_interruptible_tty(tty, wq, condition) \ 681({ \ 682 int __ret = 0; \ 683 if (!(condition)) \ 684 __ret = __wait_event_interruptible_tty(tty, wq, \ 685 condition); \ 686 __ret; \ 687}) 688 689#define __wait_event_interruptible_tty(tty, wq, condition) \ 690 ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \ 691 tty_unlock(tty); \ 692 schedule(); \ 693 tty_lock(tty)) 694 695#ifdef CONFIG_PROC_FS 696extern void proc_tty_register_driver(struct tty_driver *); 697extern void proc_tty_unregister_driver(struct tty_driver *); 698#else 699static inline void proc_tty_register_driver(struct tty_driver *d) {} 700static inline void proc_tty_unregister_driver(struct tty_driver *d) {} 701#endif 702 703#endif 704