tty.h revision 1ff454ef9b1e852e8f4d295a68a715b1dddf233c
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 52/* 53 * This character is the same as _POSIX_VDISABLE: it cannot be used as 54 * a c_cc[] character, but indicates that a particular special character 55 * isn't in use (eg VINTR has no character etc) 56 */ 57#define __DISABLED_CHAR '\0' 58 59struct tty_buffer { 60 struct tty_buffer *next; 61 char *char_buf_ptr; 62 unsigned char *flag_buf_ptr; 63 int used; 64 int size; 65 int commit; 66 int read; 67 /* Data points here */ 68 unsigned long data[0]; 69}; 70 71/* 72 * We default to dicing tty buffer allocations to this many characters 73 * in order to avoid multiple page allocations. We know the size of 74 * tty_buffer itself but it must also be taken into account that the 75 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation 76 * logic this must match 77 */ 78 79#define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF) 80 81 82struct tty_bufhead { 83 struct delayed_work work; 84 spinlock_t lock; 85 struct tty_buffer *head; /* Queue head */ 86 struct tty_buffer *tail; /* Active buffer */ 87 struct tty_buffer *free; /* Free queue head */ 88 int memory_used; /* Buffer space used excluding 89 free queue */ 90}; 91/* 92 * When a break, frame error, or parity error happens, these codes are 93 * stuffed into the flags buffer. 94 */ 95#define TTY_NORMAL 0 96#define TTY_BREAK 1 97#define TTY_FRAME 2 98#define TTY_PARITY 3 99#define TTY_OVERRUN 4 100 101#define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR]) 102#define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT]) 103#define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE]) 104#define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL]) 105#define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF]) 106#define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME]) 107#define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN]) 108#define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC]) 109#define START_CHAR(tty) ((tty)->termios->c_cc[VSTART]) 110#define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP]) 111#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP]) 112#define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL]) 113#define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT]) 114#define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD]) 115#define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE]) 116#define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT]) 117#define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2]) 118 119#define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f)) 120#define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f)) 121#define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f)) 122#define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f)) 123 124#define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK) 125#define I_BRKINT(tty) _I_FLAG((tty), BRKINT) 126#define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR) 127#define I_PARMRK(tty) _I_FLAG((tty), PARMRK) 128#define I_INPCK(tty) _I_FLAG((tty), INPCK) 129#define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP) 130#define I_INLCR(tty) _I_FLAG((tty), INLCR) 131#define I_IGNCR(tty) _I_FLAG((tty), IGNCR) 132#define I_ICRNL(tty) _I_FLAG((tty), ICRNL) 133#define I_IUCLC(tty) _I_FLAG((tty), IUCLC) 134#define I_IXON(tty) _I_FLAG((tty), IXON) 135#define I_IXANY(tty) _I_FLAG((tty), IXANY) 136#define I_IXOFF(tty) _I_FLAG((tty), IXOFF) 137#define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL) 138#define I_IUTF8(tty) _I_FLAG((tty), IUTF8) 139 140#define O_OPOST(tty) _O_FLAG((tty), OPOST) 141#define O_OLCUC(tty) _O_FLAG((tty), OLCUC) 142#define O_ONLCR(tty) _O_FLAG((tty), ONLCR) 143#define O_OCRNL(tty) _O_FLAG((tty), OCRNL) 144#define O_ONOCR(tty) _O_FLAG((tty), ONOCR) 145#define O_ONLRET(tty) _O_FLAG((tty), ONLRET) 146#define O_OFILL(tty) _O_FLAG((tty), OFILL) 147#define O_OFDEL(tty) _O_FLAG((tty), OFDEL) 148#define O_NLDLY(tty) _O_FLAG((tty), NLDLY) 149#define O_CRDLY(tty) _O_FLAG((tty), CRDLY) 150#define O_TABDLY(tty) _O_FLAG((tty), TABDLY) 151#define O_BSDLY(tty) _O_FLAG((tty), BSDLY) 152#define O_VTDLY(tty) _O_FLAG((tty), VTDLY) 153#define O_FFDLY(tty) _O_FLAG((tty), FFDLY) 154 155#define C_BAUD(tty) _C_FLAG((tty), CBAUD) 156#define C_CSIZE(tty) _C_FLAG((tty), CSIZE) 157#define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB) 158#define C_CREAD(tty) _C_FLAG((tty), CREAD) 159#define C_PARENB(tty) _C_FLAG((tty), PARENB) 160#define C_PARODD(tty) _C_FLAG((tty), PARODD) 161#define C_HUPCL(tty) _C_FLAG((tty), HUPCL) 162#define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL) 163#define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD) 164#define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS) 165 166#define L_ISIG(tty) _L_FLAG((tty), ISIG) 167#define L_ICANON(tty) _L_FLAG((tty), ICANON) 168#define L_XCASE(tty) _L_FLAG((tty), XCASE) 169#define L_ECHO(tty) _L_FLAG((tty), ECHO) 170#define L_ECHOE(tty) _L_FLAG((tty), ECHOE) 171#define L_ECHOK(tty) _L_FLAG((tty), ECHOK) 172#define L_ECHONL(tty) _L_FLAG((tty), ECHONL) 173#define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH) 174#define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP) 175#define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL) 176#define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT) 177#define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE) 178#define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO) 179#define L_PENDIN(tty) _L_FLAG((tty), PENDIN) 180#define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN) 181 182struct device; 183struct signal_struct; 184 185/* 186 * Port level information. Each device keeps its own port level information 187 * so provide a common structure for those ports wanting to use common support 188 * routines. 189 * 190 * The tty port has a different lifetime to the tty so must be kept apart. 191 * In addition be careful as tty -> port mappings are valid for the life 192 * of the tty object but in many cases port -> tty mappings are valid only 193 * until a hangup so don't use the wrong path. 194 */ 195 196struct tty_port; 197 198struct tty_port_operations { 199 /* Return 1 if the carrier is raised */ 200 int (*carrier_raised)(struct tty_port *port); 201 /* Control the DTR line */ 202 void (*dtr_rts)(struct tty_port *port, int raise); 203 /* Called when the last close completes or a hangup finishes 204 IFF the port was initialized. Do not use to free resources. Called 205 under the port mutex to serialize against activate/shutdowns */ 206 void (*shutdown)(struct tty_port *port); 207 void (*drop)(struct tty_port *port); 208 /* Called under the port mutex from tty_port_open, serialized using 209 the port mutex */ 210 /* FIXME: long term getting the tty argument *out* of this would be 211 good for consoles */ 212 int (*activate)(struct tty_port *port, struct tty_struct *tty); 213 /* Called on the final put of a port */ 214 void (*destruct)(struct tty_port *port); 215}; 216 217struct tty_port { 218 struct tty_struct *tty; /* Back pointer */ 219 const struct tty_port_operations *ops; /* Port operations */ 220 spinlock_t lock; /* Lock protecting tty field */ 221 int blocked_open; /* Waiting to open */ 222 int count; /* Usage count */ 223 wait_queue_head_t open_wait; /* Open waiters */ 224 wait_queue_head_t close_wait; /* Close waiters */ 225 wait_queue_head_t delta_msr_wait; /* Modem status change */ 226 unsigned long flags; /* TTY flags ASY_*/ 227 unsigned char console:1; /* port is a console */ 228 struct mutex mutex; /* Locking */ 229 struct mutex buf_mutex; /* Buffer alloc lock */ 230 unsigned char *xmit_buf; /* Optional buffer */ 231 unsigned int close_delay; /* Close port delay */ 232 unsigned int closing_wait; /* Delay for output */ 233 int drain_delay; /* Set to zero if no pure time 234 based drain is needed else 235 set to size of fifo */ 236 struct kref kref; /* Ref counter */ 237}; 238 239/* 240 * Where all of the state associated with a tty is kept while the tty 241 * is open. Since the termios state should be kept even if the tty 242 * has been closed --- for things like the baud rate, etc --- it is 243 * not stored here, but rather a pointer to the real state is stored 244 * here. Possible the winsize structure should have the same 245 * treatment, but (1) the default 80x24 is usually right and (2) it's 246 * most often used by a windowing system, which will set the correct 247 * size each time the window is created or resized anyway. 248 * - TYT, 9/14/92 249 */ 250 251struct tty_operations; 252 253struct tty_struct { 254 int magic; 255 struct kref kref; 256 struct tty_driver *driver; 257 const struct tty_operations *ops; 258 int index; 259 260 /* Protects ldisc changes: Lock tty not pty */ 261 struct mutex ldisc_mutex; 262 struct tty_ldisc *ldisc; 263 264 struct mutex termios_mutex; 265 spinlock_t ctrl_lock; 266 /* Termios values are protected by the termios mutex */ 267 struct ktermios *termios, *termios_locked; 268 struct termiox *termiox; /* May be NULL for unsupported */ 269 char name[64]; 270 struct pid *pgrp; /* Protected by ctrl lock */ 271 struct pid *session; 272 unsigned long flags; 273 int count; 274 struct winsize winsize; /* termios mutex */ 275 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1; 276 unsigned char low_latency:1, warned:1; 277 unsigned char ctrl_status; /* ctrl_lock */ 278 unsigned int receive_room; /* Bytes free for queue */ 279 280 struct tty_struct *link; 281 struct fasync_struct *fasync; 282 struct tty_bufhead buf; /* Locked internally */ 283 int alt_speed; /* For magic substitution of 38400 bps */ 284 wait_queue_head_t write_wait; 285 wait_queue_head_t read_wait; 286 struct work_struct hangup_work; 287 void *disc_data; 288 void *driver_data; 289 struct list_head tty_files; 290 291#define N_TTY_BUF_SIZE 4096 292 293 /* 294 * The following is data for the N_TTY line discipline. For 295 * historical reasons, this is included in the tty structure. 296 * Mostly locked by the BKL. 297 */ 298 unsigned int column; 299 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1; 300 unsigned char closing:1; 301 unsigned char echo_overrun:1; 302 unsigned short minimum_to_wake; 303 unsigned long overrun_time; 304 int num_overrun; 305 unsigned long process_char_map[256/(8*sizeof(unsigned long))]; 306 char *read_buf; 307 int read_head; 308 int read_tail; 309 int read_cnt; 310 unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))]; 311 unsigned char *echo_buf; 312 unsigned int echo_pos; 313 unsigned int echo_cnt; 314 int canon_data; 315 unsigned long canon_head; 316 unsigned int canon_column; 317 struct mutex atomic_read_lock; 318 struct mutex atomic_write_lock; 319 struct mutex output_lock; 320 struct mutex echo_lock; 321 unsigned char *write_buf; 322 int write_cnt; 323 spinlock_t read_lock; 324 /* If the tty has a pending do_SAK, queue it here - akpm */ 325 struct work_struct SAK_work; 326 struct tty_port *port; 327}; 328 329/* tty magic number */ 330#define TTY_MAGIC 0x5401 331 332/* 333 * These bits are used in the flags field of the tty structure. 334 * 335 * So that interrupts won't be able to mess up the queues, 336 * copy_to_cooked must be atomic with respect to itself, as must 337 * tty->write. Thus, you must use the inline functions set_bit() and 338 * clear_bit() to make things atomic. 339 */ 340#define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ 341#define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */ 342#define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ 343#define TTY_EXCLUSIVE 3 /* Exclusive open mode */ 344#define TTY_DEBUG 4 /* Debugging */ 345#define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ 346#define TTY_PUSH 6 /* n_tty private */ 347#define TTY_CLOSING 7 /* ->close() in progress */ 348#define TTY_LDISC 9 /* Line discipline attached */ 349#define TTY_LDISC_CHANGING 10 /* Line discipline changing */ 350#define TTY_LDISC_OPEN 11 /* Line discipline is open */ 351#define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */ 352#define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */ 353#define TTY_PTY_LOCK 16 /* pty private */ 354#define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ 355#define TTY_HUPPED 18 /* Post driver->hangup() */ 356#define TTY_FLUSHING 19 /* Flushing to ldisc in progress */ 357#define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */ 358 359#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty)) 360 361extern void tty_write_flush(struct tty_struct *); 362 363extern struct ktermios tty_std_termios; 364 365extern void console_init(void); 366extern int vcs_init(void); 367 368extern struct class *tty_class; 369 370/** 371 * tty_kref_get - get a tty reference 372 * @tty: tty device 373 * 374 * Return a new reference to a tty object. The caller must hold 375 * sufficient locks/counts to ensure that their existing reference cannot 376 * go away 377 */ 378 379static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) 380{ 381 if (tty) 382 kref_get(&tty->kref); 383 return tty; 384} 385extern void tty_kref_put(struct tty_struct *tty); 386 387extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, 388 const char *routine); 389extern char *tty_name(struct tty_struct *tty, char *buf); 390extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); 391extern int tty_check_change(struct tty_struct *tty); 392extern void stop_tty(struct tty_struct *tty); 393extern void start_tty(struct tty_struct *tty); 394extern int tty_register_driver(struct tty_driver *driver); 395extern int tty_unregister_driver(struct tty_driver *driver); 396extern struct device *tty_register_device(struct tty_driver *driver, 397 unsigned index, struct device *dev); 398extern void tty_unregister_device(struct tty_driver *driver, unsigned index); 399extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp, 400 int buflen); 401extern void tty_write_message(struct tty_struct *tty, char *msg); 402extern int tty_put_char(struct tty_struct *tty, unsigned char c); 403extern int tty_chars_in_buffer(struct tty_struct *tty); 404extern int tty_write_room(struct tty_struct *tty); 405extern void tty_driver_flush_buffer(struct tty_struct *tty); 406extern void tty_throttle(struct tty_struct *tty); 407extern void tty_unthrottle(struct tty_struct *tty); 408extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); 409extern void tty_shutdown(struct tty_struct *tty); 410extern void tty_free_termios(struct tty_struct *tty); 411extern int is_current_pgrp_orphaned(void); 412extern struct pid *tty_get_pgrp(struct tty_struct *tty); 413extern int is_ignored(int sig); 414extern int tty_signal(int sig, struct tty_struct *tty); 415extern void tty_hangup(struct tty_struct *tty); 416extern void tty_vhangup(struct tty_struct *tty); 417extern void tty_vhangup_self(void); 418extern void tty_unhangup(struct file *filp); 419extern int tty_hung_up_p(struct file *filp); 420extern void do_SAK(struct tty_struct *tty); 421extern void __do_SAK(struct tty_struct *tty); 422extern void disassociate_ctty(int priv); 423extern void no_tty(void); 424extern void tty_flip_buffer_push(struct tty_struct *tty); 425extern void tty_flush_to_ldisc(struct tty_struct *tty); 426extern void tty_buffer_free_all(struct tty_struct *tty); 427extern void tty_buffer_flush(struct tty_struct *tty); 428extern void tty_buffer_init(struct tty_struct *tty); 429extern speed_t tty_get_baud_rate(struct tty_struct *tty); 430extern speed_t tty_termios_baud_rate(struct ktermios *termios); 431extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); 432extern void tty_termios_encode_baud_rate(struct ktermios *termios, 433 speed_t ibaud, speed_t obaud); 434extern void tty_encode_baud_rate(struct tty_struct *tty, 435 speed_t ibaud, speed_t obaud); 436extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); 437extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b); 438 439extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); 440extern void tty_ldisc_deref(struct tty_ldisc *); 441extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); 442extern void tty_ldisc_hangup(struct tty_struct *tty); 443extern const struct file_operations tty_ldiscs_proc_fops; 444 445extern void tty_wakeup(struct tty_struct *tty); 446extern void tty_ldisc_flush(struct tty_struct *tty); 447 448extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 449extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, 450 unsigned int cmd, unsigned long arg); 451extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); 452extern dev_t tty_devnum(struct tty_struct *tty); 453extern void proc_clear_tty(struct task_struct *p); 454extern struct tty_struct *get_current_tty(void); 455extern void tty_default_fops(struct file_operations *fops); 456extern struct tty_struct *alloc_tty_struct(void); 457extern void free_tty_struct(struct tty_struct *tty); 458extern void initialize_tty_struct(struct tty_struct *tty, 459 struct tty_driver *driver, int idx); 460extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx, 461 int first_ok); 462extern int tty_release(struct inode *inode, struct file *filp); 463extern int tty_init_termios(struct tty_struct *tty); 464 465extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty); 466extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty); 467 468extern struct mutex tty_mutex; 469 470extern void tty_write_unlock(struct tty_struct *tty); 471extern int tty_write_lock(struct tty_struct *tty, int ndelay); 472#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) 473 474extern void tty_port_init(struct tty_port *port); 475extern int tty_port_alloc_xmit_buf(struct tty_port *port); 476extern void tty_port_free_xmit_buf(struct tty_port *port); 477extern void tty_port_put(struct tty_port *port); 478 479static inline struct tty_port *tty_port_get(struct tty_port *port) 480{ 481 if (port) 482 kref_get(&port->kref); 483 return port; 484} 485 486extern struct tty_struct *tty_port_tty_get(struct tty_port *port); 487extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); 488extern int tty_port_carrier_raised(struct tty_port *port); 489extern void tty_port_raise_dtr_rts(struct tty_port *port); 490extern void tty_port_lower_dtr_rts(struct tty_port *port); 491extern void tty_port_hangup(struct tty_port *port); 492extern int tty_port_block_til_ready(struct tty_port *port, 493 struct tty_struct *tty, struct file *filp); 494extern int tty_port_close_start(struct tty_port *port, 495 struct tty_struct *tty, struct file *filp); 496extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); 497extern void tty_port_close(struct tty_port *port, 498 struct tty_struct *tty, struct file *filp); 499extern int tty_port_open(struct tty_port *port, 500 struct tty_struct *tty, struct file *filp); 501static inline int tty_port_users(struct tty_port *port) 502{ 503 return port->count + port->blocked_open; 504} 505 506extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); 507extern int tty_unregister_ldisc(int disc); 508extern int tty_set_ldisc(struct tty_struct *tty, int ldisc); 509extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); 510extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty); 511extern void tty_ldisc_init(struct tty_struct *tty); 512extern void tty_ldisc_begin(void); 513/* This last one is just for the tty layer internals and shouldn't be used elsewhere */ 514extern void tty_ldisc_enable(struct tty_struct *tty); 515 516 517/* n_tty.c */ 518extern struct tty_ldisc_ops tty_ldisc_N_TTY; 519extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); 520 521/* tty_audit.c */ 522#ifdef CONFIG_AUDIT 523extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, 524 size_t size); 525extern void tty_audit_exit(void); 526extern void tty_audit_fork(struct signal_struct *sig); 527extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); 528extern void tty_audit_push(struct tty_struct *tty); 529extern void tty_audit_push_task(struct task_struct *tsk, 530 uid_t loginuid, u32 sessionid); 531#else 532static inline void tty_audit_add_data(struct tty_struct *tty, 533 unsigned char *data, size_t size) 534{ 535} 536static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) 537{ 538} 539static inline void tty_audit_exit(void) 540{ 541} 542static inline void tty_audit_fork(struct signal_struct *sig) 543{ 544} 545static inline void tty_audit_push(struct tty_struct *tty) 546{ 547} 548static inline void tty_audit_push_task(struct task_struct *tsk, 549 uid_t loginuid, u32 sessionid) 550{ 551} 552#endif 553 554/* tty_ioctl.c */ 555extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, 556 unsigned int cmd, unsigned long arg); 557 558/* serial.c */ 559 560extern void serial_console_init(void); 561 562/* pcxx.c */ 563 564extern int pcxe_open(struct tty_struct *tty, struct file *filp); 565 566/* vt.c */ 567 568extern int vt_ioctl(struct tty_struct *tty, struct file *file, 569 unsigned int cmd, unsigned long arg); 570 571extern long vt_compat_ioctl(struct tty_struct *tty, struct file * file, 572 unsigned int cmd, unsigned long arg); 573 574#endif /* __KERNEL__ */ 575#endif 576