tty.h revision 31d1d48e199e99077fb30f6fb9a793be7bec756f
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 17#include <asm/system.h> 18 19 20/* 21 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are 22 * hardcoded at present.) 23 */ 24#define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ 25#define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ 26#define NR_LDISCS 30 27 28/* line disciplines */ 29#define N_TTY 0 30#define N_SLIP 1 31#define N_MOUSE 2 32#define N_PPP 3 33#define N_STRIP 4 34#define N_AX25 5 35#define N_X25 6 /* X.25 async */ 36#define N_6PACK 7 37#define N_MASC 8 /* Reserved for Mobitex module <kaz@cafe.net> */ 38#define N_R3964 9 /* Reserved for Simatic R3964 module */ 39#define N_PROFIBUS_FDL 10 /* Reserved for Profibus */ 40#define N_IRDA 11 /* Linux IrDa - http://irda.sourceforge.net/ */ 41#define N_SMSBLOCK 12 /* SMS block mode - for talking to GSM data */ 42 /* cards about SMS messages */ 43#define N_HDLC 13 /* synchronous HDLC */ 44#define N_SYNC_PPP 14 /* synchronous PPP */ 45#define N_HCI 15 /* Bluetooth HCI UART */ 46#define N_GIGASET_M101 16 /* Siemens Gigaset M101 serial DECT adapter */ 47#define N_SLCAN 17 /* Serial / USB serial CAN Adaptors */ 48#define N_PPS 18 /* Pulse per Second */ 49#define N_V253 19 /* Codec control over voice modem */ 50#define N_CAIF 20 /* CAIF protocol for talking to modems */ 51#define N_GSM0710 21 /* GSM 0710 Mux */ 52 53/* 54 * This character is the same as _POSIX_VDISABLE: it cannot be used as 55 * a c_cc[] character, but indicates that a particular special character 56 * isn't in use (eg VINTR has no character etc) 57 */ 58#define __DISABLED_CHAR '\0' 59 60struct tty_buffer { 61 struct tty_buffer *next; 62 char *char_buf_ptr; 63 unsigned char *flag_buf_ptr; 64 int used; 65 int size; 66 int commit; 67 int read; 68 /* Data points here */ 69 unsigned long data[0]; 70}; 71 72/* 73 * We default to dicing tty buffer allocations to this many characters 74 * in order to avoid multiple page allocations. We know the size of 75 * tty_buffer itself but it must also be taken into account that the 76 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation 77 * logic this must match 78 */ 79 80#define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF) 81 82 83struct tty_bufhead { 84 struct delayed_work work; 85 spinlock_t lock; 86 struct tty_buffer *head; /* Queue head */ 87 struct tty_buffer *tail; /* Active buffer */ 88 struct tty_buffer *free; /* Free queue head */ 89 int memory_used; /* Buffer space used excluding 90 free queue */ 91}; 92/* 93 * When a break, frame error, or parity error happens, these codes are 94 * stuffed into the flags buffer. 95 */ 96#define TTY_NORMAL 0 97#define TTY_BREAK 1 98#define TTY_FRAME 2 99#define TTY_PARITY 3 100#define TTY_OVERRUN 4 101 102#define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR]) 103#define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT]) 104#define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE]) 105#define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL]) 106#define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF]) 107#define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME]) 108#define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN]) 109#define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC]) 110#define START_CHAR(tty) ((tty)->termios->c_cc[VSTART]) 111#define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP]) 112#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP]) 113#define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL]) 114#define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT]) 115#define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD]) 116#define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE]) 117#define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT]) 118#define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2]) 119 120#define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f)) 121#define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f)) 122#define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f)) 123#define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f)) 124 125#define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK) 126#define I_BRKINT(tty) _I_FLAG((tty), BRKINT) 127#define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR) 128#define I_PARMRK(tty) _I_FLAG((tty), PARMRK) 129#define I_INPCK(tty) _I_FLAG((tty), INPCK) 130#define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP) 131#define I_INLCR(tty) _I_FLAG((tty), INLCR) 132#define I_IGNCR(tty) _I_FLAG((tty), IGNCR) 133#define I_ICRNL(tty) _I_FLAG((tty), ICRNL) 134#define I_IUCLC(tty) _I_FLAG((tty), IUCLC) 135#define I_IXON(tty) _I_FLAG((tty), IXON) 136#define I_IXANY(tty) _I_FLAG((tty), IXANY) 137#define I_IXOFF(tty) _I_FLAG((tty), IXOFF) 138#define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL) 139#define I_IUTF8(tty) _I_FLAG((tty), IUTF8) 140 141#define O_OPOST(tty) _O_FLAG((tty), OPOST) 142#define O_OLCUC(tty) _O_FLAG((tty), OLCUC) 143#define O_ONLCR(tty) _O_FLAG((tty), ONLCR) 144#define O_OCRNL(tty) _O_FLAG((tty), OCRNL) 145#define O_ONOCR(tty) _O_FLAG((tty), ONOCR) 146#define O_ONLRET(tty) _O_FLAG((tty), ONLRET) 147#define O_OFILL(tty) _O_FLAG((tty), OFILL) 148#define O_OFDEL(tty) _O_FLAG((tty), OFDEL) 149#define O_NLDLY(tty) _O_FLAG((tty), NLDLY) 150#define O_CRDLY(tty) _O_FLAG((tty), CRDLY) 151#define O_TABDLY(tty) _O_FLAG((tty), TABDLY) 152#define O_BSDLY(tty) _O_FLAG((tty), BSDLY) 153#define O_VTDLY(tty) _O_FLAG((tty), VTDLY) 154#define O_FFDLY(tty) _O_FLAG((tty), FFDLY) 155 156#define C_BAUD(tty) _C_FLAG((tty), CBAUD) 157#define C_CSIZE(tty) _C_FLAG((tty), CSIZE) 158#define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB) 159#define C_CREAD(tty) _C_FLAG((tty), CREAD) 160#define C_PARENB(tty) _C_FLAG((tty), PARENB) 161#define C_PARODD(tty) _C_FLAG((tty), PARODD) 162#define C_HUPCL(tty) _C_FLAG((tty), HUPCL) 163#define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL) 164#define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD) 165#define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS) 166 167#define L_ISIG(tty) _L_FLAG((tty), ISIG) 168#define L_ICANON(tty) _L_FLAG((tty), ICANON) 169#define L_XCASE(tty) _L_FLAG((tty), XCASE) 170#define L_ECHO(tty) _L_FLAG((tty), ECHO) 171#define L_ECHOE(tty) _L_FLAG((tty), ECHOE) 172#define L_ECHOK(tty) _L_FLAG((tty), ECHOK) 173#define L_ECHONL(tty) _L_FLAG((tty), ECHONL) 174#define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH) 175#define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP) 176#define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL) 177#define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT) 178#define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE) 179#define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO) 180#define L_PENDIN(tty) _L_FLAG((tty), PENDIN) 181#define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN) 182 183struct device; 184struct signal_struct; 185 186/* 187 * Port level information. Each device keeps its own port level information 188 * so provide a common structure for those ports wanting to use common support 189 * routines. 190 * 191 * The tty port has a different lifetime to the tty so must be kept apart. 192 * In addition be careful as tty -> port mappings are valid for the life 193 * of the tty object but in many cases port -> tty mappings are valid only 194 * until a hangup so don't use the wrong path. 195 */ 196 197struct tty_port; 198 199struct tty_port_operations { 200 /* Return 1 if the carrier is raised */ 201 int (*carrier_raised)(struct tty_port *port); 202 /* Control the DTR line */ 203 void (*dtr_rts)(struct tty_port *port, int raise); 204 /* Called when the last close completes or a hangup finishes 205 IFF the port was initialized. Do not use to free resources. Called 206 under the port mutex to serialize against activate/shutdowns */ 207 void (*shutdown)(struct tty_port *port); 208 void (*drop)(struct tty_port *port); 209 /* Called under the port mutex from tty_port_open, serialized using 210 the port mutex */ 211 /* FIXME: long term getting the tty argument *out* of this would be 212 good for consoles */ 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/* tty magic number */ 331#define TTY_MAGIC 0x5401 332 333/* 334 * These bits are used in the flags field of the tty structure. 335 * 336 * So that interrupts won't be able to mess up the queues, 337 * copy_to_cooked must be atomic with respect to itself, as must 338 * tty->write. Thus, you must use the inline functions set_bit() and 339 * clear_bit() to make things atomic. 340 */ 341#define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ 342#define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */ 343#define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ 344#define TTY_EXCLUSIVE 3 /* Exclusive open mode */ 345#define TTY_DEBUG 4 /* Debugging */ 346#define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ 347#define TTY_PUSH 6 /* n_tty private */ 348#define TTY_CLOSING 7 /* ->close() in progress */ 349#define TTY_LDISC 9 /* Line discipline attached */ 350#define TTY_LDISC_CHANGING 10 /* Line discipline changing */ 351#define TTY_LDISC_OPEN 11 /* Line discipline is open */ 352#define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */ 353#define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */ 354#define TTY_PTY_LOCK 16 /* pty private */ 355#define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ 356#define TTY_HUPPED 18 /* Post driver->hangup() */ 357#define TTY_FLUSHING 19 /* Flushing to ldisc in progress */ 358#define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */ 359 360#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty)) 361 362extern void tty_write_flush(struct tty_struct *); 363 364extern struct ktermios tty_std_termios; 365 366extern void console_init(void); 367extern int vcs_init(void); 368 369extern struct class *tty_class; 370 371/** 372 * tty_kref_get - get a tty reference 373 * @tty: tty device 374 * 375 * Return a new reference to a tty object. The caller must hold 376 * sufficient locks/counts to ensure that their existing reference cannot 377 * go away 378 */ 379 380static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) 381{ 382 if (tty) 383 kref_get(&tty->kref); 384 return tty; 385} 386extern void tty_kref_put(struct tty_struct *tty); 387 388extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, 389 const char *routine); 390extern char *tty_name(struct tty_struct *tty, char *buf); 391extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); 392extern int tty_check_change(struct tty_struct *tty); 393extern void stop_tty(struct tty_struct *tty); 394extern void start_tty(struct tty_struct *tty); 395extern int tty_register_driver(struct tty_driver *driver); 396extern int tty_unregister_driver(struct tty_driver *driver); 397extern struct device *tty_register_device(struct tty_driver *driver, 398 unsigned index, struct device *dev); 399extern void tty_unregister_device(struct tty_driver *driver, unsigned index); 400extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp, 401 int buflen); 402extern void tty_write_message(struct tty_struct *tty, char *msg); 403extern int tty_put_char(struct tty_struct *tty, unsigned char c); 404extern int tty_chars_in_buffer(struct tty_struct *tty); 405extern int tty_write_room(struct tty_struct *tty); 406extern void tty_driver_flush_buffer(struct tty_struct *tty); 407extern void tty_throttle(struct tty_struct *tty); 408extern void tty_unthrottle(struct tty_struct *tty); 409extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); 410extern void tty_shutdown(struct tty_struct *tty); 411extern void tty_free_termios(struct tty_struct *tty); 412extern int is_current_pgrp_orphaned(void); 413extern struct pid *tty_get_pgrp(struct tty_struct *tty); 414extern int is_ignored(int sig); 415extern int tty_signal(int sig, struct tty_struct *tty); 416extern void tty_hangup(struct tty_struct *tty); 417extern void tty_vhangup(struct tty_struct *tty); 418extern void tty_vhangup_self(void); 419extern void tty_unhangup(struct file *filp); 420extern int tty_hung_up_p(struct file *filp); 421extern void do_SAK(struct tty_struct *tty); 422extern void __do_SAK(struct tty_struct *tty); 423extern void disassociate_ctty(int priv); 424extern void no_tty(void); 425extern void tty_flip_buffer_push(struct tty_struct *tty); 426extern void tty_flush_to_ldisc(struct tty_struct *tty); 427extern void tty_buffer_free_all(struct tty_struct *tty); 428extern void tty_buffer_flush(struct tty_struct *tty); 429extern void tty_buffer_init(struct tty_struct *tty); 430extern speed_t tty_get_baud_rate(struct tty_struct *tty); 431extern speed_t tty_termios_baud_rate(struct ktermios *termios); 432extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); 433extern void tty_termios_encode_baud_rate(struct ktermios *termios, 434 speed_t ibaud, speed_t obaud); 435extern void tty_encode_baud_rate(struct tty_struct *tty, 436 speed_t ibaud, speed_t obaud); 437extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); 438extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b); 439 440extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); 441extern void tty_ldisc_deref(struct tty_ldisc *); 442extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); 443extern void tty_ldisc_hangup(struct tty_struct *tty); 444extern const struct file_operations tty_ldiscs_proc_fops; 445 446extern void tty_wakeup(struct tty_struct *tty); 447extern void tty_ldisc_flush(struct tty_struct *tty); 448 449extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 450extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, 451 unsigned int cmd, unsigned long arg); 452extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); 453extern dev_t tty_devnum(struct tty_struct *tty); 454extern void proc_clear_tty(struct task_struct *p); 455extern struct tty_struct *get_current_tty(void); 456extern void tty_default_fops(struct file_operations *fops); 457extern struct tty_struct *alloc_tty_struct(void); 458extern void free_tty_struct(struct tty_struct *tty); 459extern void initialize_tty_struct(struct tty_struct *tty, 460 struct tty_driver *driver, int idx); 461extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx, 462 int first_ok); 463extern int tty_release(struct inode *inode, struct file *filp); 464extern int tty_init_termios(struct tty_struct *tty); 465 466extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty); 467extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty); 468 469extern struct mutex tty_mutex; 470 471extern void tty_write_unlock(struct tty_struct *tty); 472extern int tty_write_lock(struct tty_struct *tty, int ndelay); 473#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) 474 475extern void tty_port_init(struct tty_port *port); 476extern int tty_port_alloc_xmit_buf(struct tty_port *port); 477extern void tty_port_free_xmit_buf(struct tty_port *port); 478extern void tty_port_put(struct tty_port *port); 479 480static inline struct tty_port *tty_port_get(struct tty_port *port) 481{ 482 if (port) 483 kref_get(&port->kref); 484 return port; 485} 486 487extern struct tty_struct *tty_port_tty_get(struct tty_port *port); 488extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); 489extern int tty_port_carrier_raised(struct tty_port *port); 490extern void tty_port_raise_dtr_rts(struct tty_port *port); 491extern void tty_port_lower_dtr_rts(struct tty_port *port); 492extern void tty_port_hangup(struct tty_port *port); 493extern int tty_port_block_til_ready(struct tty_port *port, 494 struct tty_struct *tty, struct file *filp); 495extern int tty_port_close_start(struct tty_port *port, 496 struct tty_struct *tty, struct file *filp); 497extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); 498extern void tty_port_close(struct tty_port *port, 499 struct tty_struct *tty, struct file *filp); 500extern int tty_port_open(struct tty_port *port, 501 struct tty_struct *tty, struct file *filp); 502static inline int tty_port_users(struct tty_port *port) 503{ 504 return port->count + port->blocked_open; 505} 506 507extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); 508extern int tty_unregister_ldisc(int disc); 509extern int tty_set_ldisc(struct tty_struct *tty, int ldisc); 510extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); 511extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty); 512extern void tty_ldisc_init(struct tty_struct *tty); 513extern void tty_ldisc_begin(void); 514/* This last one is just for the tty layer internals and shouldn't be used elsewhere */ 515extern void tty_ldisc_enable(struct tty_struct *tty); 516 517 518/* n_tty.c */ 519extern struct tty_ldisc_ops tty_ldisc_N_TTY; 520extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); 521 522/* tty_audit.c */ 523#ifdef CONFIG_AUDIT 524extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, 525 size_t size); 526extern void tty_audit_exit(void); 527extern void tty_audit_fork(struct signal_struct *sig); 528extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); 529extern void tty_audit_push(struct tty_struct *tty); 530extern void tty_audit_push_task(struct task_struct *tsk, 531 uid_t loginuid, u32 sessionid); 532#else 533static inline void tty_audit_add_data(struct tty_struct *tty, 534 unsigned char *data, size_t size) 535{ 536} 537static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) 538{ 539} 540static inline void tty_audit_exit(void) 541{ 542} 543static inline void tty_audit_fork(struct signal_struct *sig) 544{ 545} 546static inline void tty_audit_push(struct tty_struct *tty) 547{ 548} 549static inline void tty_audit_push_task(struct task_struct *tsk, 550 uid_t loginuid, u32 sessionid) 551{ 552} 553#endif 554 555/* tty_io.c */ 556extern int __init tty_init(void); 557 558/* tty_ioctl.c */ 559extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, 560 unsigned int cmd, unsigned long arg); 561 562/* serial.c */ 563 564extern void serial_console_init(void); 565 566/* pcxx.c */ 567 568extern int pcxe_open(struct tty_struct *tty, struct file *filp); 569 570/* vt.c */ 571 572extern int vt_ioctl(struct tty_struct *tty, struct file *file, 573 unsigned int cmd, unsigned long arg); 574 575extern long vt_compat_ioctl(struct tty_struct *tty, struct file * file, 576 unsigned int cmd, unsigned long arg); 577 578#endif /* __KERNEL__ */ 579#endif 580