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