tty.h revision 3c80fe4ac9cfb13b1bfa4edf1544e8b656716694
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#define N_TI_WL 22 /* for TI's WL BT, FM, GPS combo chips */ 54 55/* 56 * This character is the same as _POSIX_VDISABLE: it cannot be used as 57 * a c_cc[] character, but indicates that a particular special character 58 * isn't in use (eg VINTR has no character etc) 59 */ 60#define __DISABLED_CHAR '\0' 61 62struct tty_buffer { 63 struct tty_buffer *next; 64 char *char_buf_ptr; 65 unsigned char *flag_buf_ptr; 66 int used; 67 int size; 68 int commit; 69 int read; 70 /* Data points here */ 71 unsigned long data[0]; 72}; 73 74/* 75 * We default to dicing tty buffer allocations to this many characters 76 * in order to avoid multiple page allocations. We know the size of 77 * tty_buffer itself but it must also be taken into account that the 78 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation 79 * logic this must match 80 */ 81 82#define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF) 83 84 85struct tty_bufhead { 86 struct delayed_work work; 87 spinlock_t lock; 88 struct tty_buffer *head; /* Queue head */ 89 struct tty_buffer *tail; /* Active buffer */ 90 struct tty_buffer *free; /* Free queue head */ 91 int memory_used; /* Buffer space used excluding 92 free queue */ 93}; 94/* 95 * When a break, frame error, or parity error happens, these codes are 96 * stuffed into the flags buffer. 97 */ 98#define TTY_NORMAL 0 99#define TTY_BREAK 1 100#define TTY_FRAME 2 101#define TTY_PARITY 3 102#define TTY_OVERRUN 4 103 104#define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR]) 105#define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT]) 106#define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE]) 107#define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL]) 108#define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF]) 109#define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME]) 110#define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN]) 111#define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC]) 112#define START_CHAR(tty) ((tty)->termios->c_cc[VSTART]) 113#define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP]) 114#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP]) 115#define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL]) 116#define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT]) 117#define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD]) 118#define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE]) 119#define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT]) 120#define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2]) 121 122#define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f)) 123#define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f)) 124#define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f)) 125#define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f)) 126 127#define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK) 128#define I_BRKINT(tty) _I_FLAG((tty), BRKINT) 129#define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR) 130#define I_PARMRK(tty) _I_FLAG((tty), PARMRK) 131#define I_INPCK(tty) _I_FLAG((tty), INPCK) 132#define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP) 133#define I_INLCR(tty) _I_FLAG((tty), INLCR) 134#define I_IGNCR(tty) _I_FLAG((tty), IGNCR) 135#define I_ICRNL(tty) _I_FLAG((tty), ICRNL) 136#define I_IUCLC(tty) _I_FLAG((tty), IUCLC) 137#define I_IXON(tty) _I_FLAG((tty), IXON) 138#define I_IXANY(tty) _I_FLAG((tty), IXANY) 139#define I_IXOFF(tty) _I_FLAG((tty), IXOFF) 140#define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL) 141#define I_IUTF8(tty) _I_FLAG((tty), IUTF8) 142 143#define O_OPOST(tty) _O_FLAG((tty), OPOST) 144#define O_OLCUC(tty) _O_FLAG((tty), OLCUC) 145#define O_ONLCR(tty) _O_FLAG((tty), ONLCR) 146#define O_OCRNL(tty) _O_FLAG((tty), OCRNL) 147#define O_ONOCR(tty) _O_FLAG((tty), ONOCR) 148#define O_ONLRET(tty) _O_FLAG((tty), ONLRET) 149#define O_OFILL(tty) _O_FLAG((tty), OFILL) 150#define O_OFDEL(tty) _O_FLAG((tty), OFDEL) 151#define O_NLDLY(tty) _O_FLAG((tty), NLDLY) 152#define O_CRDLY(tty) _O_FLAG((tty), CRDLY) 153#define O_TABDLY(tty) _O_FLAG((tty), TABDLY) 154#define O_BSDLY(tty) _O_FLAG((tty), BSDLY) 155#define O_VTDLY(tty) _O_FLAG((tty), VTDLY) 156#define O_FFDLY(tty) _O_FLAG((tty), FFDLY) 157 158#define C_BAUD(tty) _C_FLAG((tty), CBAUD) 159#define C_CSIZE(tty) _C_FLAG((tty), CSIZE) 160#define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB) 161#define C_CREAD(tty) _C_FLAG((tty), CREAD) 162#define C_PARENB(tty) _C_FLAG((tty), PARENB) 163#define C_PARODD(tty) _C_FLAG((tty), PARODD) 164#define C_HUPCL(tty) _C_FLAG((tty), HUPCL) 165#define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL) 166#define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD) 167#define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS) 168 169#define L_ISIG(tty) _L_FLAG((tty), ISIG) 170#define L_ICANON(tty) _L_FLAG((tty), ICANON) 171#define L_XCASE(tty) _L_FLAG((tty), XCASE) 172#define L_ECHO(tty) _L_FLAG((tty), ECHO) 173#define L_ECHOE(tty) _L_FLAG((tty), ECHOE) 174#define L_ECHOK(tty) _L_FLAG((tty), ECHOK) 175#define L_ECHONL(tty) _L_FLAG((tty), ECHONL) 176#define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH) 177#define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP) 178#define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL) 179#define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT) 180#define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE) 181#define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO) 182#define L_PENDIN(tty) _L_FLAG((tty), PENDIN) 183#define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN) 184#define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC) 185 186struct device; 187struct signal_struct; 188 189/* 190 * Port level information. Each device keeps its own port level information 191 * so provide a common structure for those ports wanting to use common support 192 * routines. 193 * 194 * The tty port has a different lifetime to the tty so must be kept apart. 195 * In addition be careful as tty -> port mappings are valid for the life 196 * of the tty object but in many cases port -> tty mappings are valid only 197 * until a hangup so don't use the wrong path. 198 */ 199 200struct tty_port; 201 202struct tty_port_operations { 203 /* Return 1 if the carrier is raised */ 204 int (*carrier_raised)(struct tty_port *port); 205 /* Control the DTR line */ 206 void (*dtr_rts)(struct tty_port *port, int raise); 207 /* Called when the last close completes or a hangup finishes 208 IFF the port was initialized. Do not use to free resources. Called 209 under the port mutex to serialize against activate/shutdowns */ 210 void (*shutdown)(struct tty_port *port); 211 void (*drop)(struct tty_port *port); 212 /* Called under the port mutex from tty_port_open, serialized using 213 the port mutex */ 214 /* FIXME: long term getting the tty argument *out* of this would be 215 good for consoles */ 216 int (*activate)(struct tty_port *port, struct tty_struct *tty); 217 /* Called on the final put of a port */ 218 void (*destruct)(struct tty_port *port); 219}; 220 221struct tty_port { 222 struct tty_struct *tty; /* Back pointer */ 223 const struct tty_port_operations *ops; /* Port operations */ 224 spinlock_t lock; /* Lock protecting tty field */ 225 int blocked_open; /* Waiting to open */ 226 int count; /* Usage count */ 227 wait_queue_head_t open_wait; /* Open waiters */ 228 wait_queue_head_t close_wait; /* Close waiters */ 229 wait_queue_head_t delta_msr_wait; /* Modem status change */ 230 unsigned long flags; /* TTY flags ASY_*/ 231 unsigned char console:1; /* port is a console */ 232 struct mutex mutex; /* Locking */ 233 struct mutex buf_mutex; /* Buffer alloc lock */ 234 unsigned char *xmit_buf; /* Optional buffer */ 235 unsigned int close_delay; /* Close port delay */ 236 unsigned int closing_wait; /* Delay for output */ 237 int drain_delay; /* Set to zero if no pure time 238 based drain is needed else 239 set to size of fifo */ 240 struct kref kref; /* Ref counter */ 241}; 242 243/* 244 * Where all of the state associated with a tty is kept while the tty 245 * is open. Since the termios state should be kept even if the tty 246 * has been closed --- for things like the baud rate, etc --- it is 247 * not stored here, but rather a pointer to the real state is stored 248 * here. Possible the winsize structure should have the same 249 * treatment, but (1) the default 80x24 is usually right and (2) it's 250 * most often used by a windowing system, which will set the correct 251 * size each time the window is created or resized anyway. 252 * - TYT, 9/14/92 253 */ 254 255struct tty_operations; 256 257struct tty_struct { 258 int magic; 259 struct kref kref; 260 struct device *dev; 261 struct tty_driver *driver; 262 const struct tty_operations *ops; 263 int index; 264 265 /* Protects ldisc changes: Lock tty not pty */ 266 struct mutex ldisc_mutex; 267 struct tty_ldisc *ldisc; 268 269 struct mutex termios_mutex; 270 spinlock_t ctrl_lock; 271 /* Termios values are protected by the termios mutex */ 272 struct ktermios *termios, *termios_locked; 273 struct termiox *termiox; /* May be NULL for unsupported */ 274 char name[64]; 275 struct pid *pgrp; /* Protected by ctrl lock */ 276 struct pid *session; 277 unsigned long flags; 278 int count; 279 struct winsize winsize; /* termios mutex */ 280 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1; 281 unsigned char low_latency:1, warned:1; 282 unsigned char ctrl_status; /* ctrl_lock */ 283 unsigned int receive_room; /* Bytes free for queue */ 284 285 struct tty_struct *link; 286 struct fasync_struct *fasync; 287 struct tty_bufhead buf; /* Locked internally */ 288 int alt_speed; /* For magic substitution of 38400 bps */ 289 wait_queue_head_t write_wait; 290 wait_queue_head_t read_wait; 291 struct work_struct hangup_work; 292 void *disc_data; 293 void *driver_data; 294 struct list_head tty_files; 295 296#define N_TTY_BUF_SIZE 4096 297 298 /* 299 * The following is data for the N_TTY line discipline. For 300 * historical reasons, this is included in the tty structure. 301 * Mostly locked by the BKL. 302 */ 303 unsigned int column; 304 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1; 305 unsigned char closing:1; 306 unsigned char echo_overrun:1; 307 unsigned short minimum_to_wake; 308 unsigned long overrun_time; 309 int num_overrun; 310 unsigned long process_char_map[256/(8*sizeof(unsigned long))]; 311 char *read_buf; 312 int read_head; 313 int read_tail; 314 int read_cnt; 315 unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))]; 316 unsigned char *echo_buf; 317 unsigned int echo_pos; 318 unsigned int echo_cnt; 319 int canon_data; 320 unsigned long canon_head; 321 unsigned int canon_column; 322 struct mutex atomic_read_lock; 323 struct mutex atomic_write_lock; 324 struct mutex output_lock; 325 struct mutex echo_lock; 326 unsigned char *write_buf; 327 int write_cnt; 328 spinlock_t read_lock; 329 /* If the tty has a pending do_SAK, queue it here - akpm */ 330 struct work_struct SAK_work; 331 struct tty_port *port; 332}; 333 334/* Each of a tty's open files has private_data pointing to tty_file_private */ 335struct tty_file_private { 336 struct tty_struct *tty; 337 struct file *file; 338 struct list_head list; 339}; 340 341/* tty magic number */ 342#define TTY_MAGIC 0x5401 343 344/* 345 * These bits are used in the flags field of the tty structure. 346 * 347 * So that interrupts won't be able to mess up the queues, 348 * copy_to_cooked must be atomic with respect to itself, as must 349 * tty->write. Thus, you must use the inline functions set_bit() and 350 * clear_bit() to make things atomic. 351 */ 352#define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ 353#define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */ 354#define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ 355#define TTY_EXCLUSIVE 3 /* Exclusive open mode */ 356#define TTY_DEBUG 4 /* Debugging */ 357#define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ 358#define TTY_PUSH 6 /* n_tty private */ 359#define TTY_CLOSING 7 /* ->close() in progress */ 360#define TTY_LDISC 9 /* Line discipline attached */ 361#define TTY_LDISC_CHANGING 10 /* Line discipline changing */ 362#define TTY_LDISC_OPEN 11 /* Line discipline is open */ 363#define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */ 364#define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */ 365#define TTY_PTY_LOCK 16 /* pty private */ 366#define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ 367#define TTY_HUPPED 18 /* Post driver->hangup() */ 368#define TTY_FLUSHING 19 /* Flushing to ldisc in progress */ 369#define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */ 370 371#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty)) 372 373extern void tty_write_flush(struct tty_struct *); 374 375extern struct ktermios tty_std_termios; 376 377extern void console_init(void); 378extern int vcs_init(void); 379 380extern struct class *tty_class; 381 382/** 383 * tty_kref_get - get a tty reference 384 * @tty: tty device 385 * 386 * Return a new reference to a tty object. The caller must hold 387 * sufficient locks/counts to ensure that their existing reference cannot 388 * go away 389 */ 390 391static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) 392{ 393 if (tty) 394 kref_get(&tty->kref); 395 return tty; 396} 397extern void tty_kref_put(struct tty_struct *tty); 398 399extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, 400 const char *routine); 401extern char *tty_name(struct tty_struct *tty, char *buf); 402extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); 403extern int tty_check_change(struct tty_struct *tty); 404extern void stop_tty(struct tty_struct *tty); 405extern void start_tty(struct tty_struct *tty); 406extern int tty_register_driver(struct tty_driver *driver); 407extern int tty_unregister_driver(struct tty_driver *driver); 408extern struct device *tty_register_device(struct tty_driver *driver, 409 unsigned index, struct device *dev); 410extern void tty_unregister_device(struct tty_driver *driver, unsigned index); 411extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp, 412 int buflen); 413extern void tty_write_message(struct tty_struct *tty, char *msg); 414extern int tty_put_char(struct tty_struct *tty, unsigned char c); 415extern int tty_chars_in_buffer(struct tty_struct *tty); 416extern int tty_write_room(struct tty_struct *tty); 417extern void tty_driver_flush_buffer(struct tty_struct *tty); 418extern void tty_throttle(struct tty_struct *tty); 419extern void tty_unthrottle(struct tty_struct *tty); 420extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); 421extern void tty_shutdown(struct tty_struct *tty); 422extern void tty_free_termios(struct tty_struct *tty); 423extern int is_current_pgrp_orphaned(void); 424extern struct pid *tty_get_pgrp(struct tty_struct *tty); 425extern int is_ignored(int sig); 426extern int tty_signal(int sig, struct tty_struct *tty); 427extern void tty_hangup(struct tty_struct *tty); 428extern void tty_vhangup(struct tty_struct *tty); 429extern void tty_vhangup_locked(struct tty_struct *tty); 430extern void tty_vhangup_self(void); 431extern void tty_unhangup(struct file *filp); 432extern int tty_hung_up_p(struct file *filp); 433extern void do_SAK(struct tty_struct *tty); 434extern void __do_SAK(struct tty_struct *tty); 435extern void disassociate_ctty(int priv); 436extern void no_tty(void); 437extern void tty_flip_buffer_push(struct tty_struct *tty); 438extern void tty_flush_to_ldisc(struct tty_struct *tty); 439extern void tty_buffer_free_all(struct tty_struct *tty); 440extern void tty_buffer_flush(struct tty_struct *tty); 441extern void tty_buffer_init(struct tty_struct *tty); 442extern speed_t tty_get_baud_rate(struct tty_struct *tty); 443extern speed_t tty_termios_baud_rate(struct ktermios *termios); 444extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); 445extern void tty_termios_encode_baud_rate(struct ktermios *termios, 446 speed_t ibaud, speed_t obaud); 447extern void tty_encode_baud_rate(struct tty_struct *tty, 448 speed_t ibaud, speed_t obaud); 449extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); 450extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b); 451 452extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); 453extern void tty_ldisc_deref(struct tty_ldisc *); 454extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); 455extern void tty_ldisc_hangup(struct tty_struct *tty); 456extern const struct file_operations tty_ldiscs_proc_fops; 457 458extern void tty_wakeup(struct tty_struct *tty); 459extern void tty_ldisc_flush(struct tty_struct *tty); 460 461extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 462extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, 463 unsigned int cmd, unsigned long arg); 464extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); 465extern dev_t tty_devnum(struct tty_struct *tty); 466extern void proc_clear_tty(struct task_struct *p); 467extern struct tty_struct *get_current_tty(void); 468extern void tty_default_fops(struct file_operations *fops); 469extern struct tty_struct *alloc_tty_struct(void); 470extern int tty_add_file(struct tty_struct *tty, struct file *file); 471extern void free_tty_struct(struct tty_struct *tty); 472extern void initialize_tty_struct(struct tty_struct *tty, 473 struct tty_driver *driver, int idx); 474extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx, 475 int first_ok); 476extern int tty_release(struct inode *inode, struct file *filp); 477extern int tty_init_termios(struct tty_struct *tty); 478 479extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty); 480extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty); 481 482extern struct mutex tty_mutex; 483extern spinlock_t tty_files_lock; 484 485extern void tty_write_unlock(struct tty_struct *tty); 486extern int tty_write_lock(struct tty_struct *tty, int ndelay); 487#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) 488 489extern void tty_port_init(struct tty_port *port); 490extern int tty_port_alloc_xmit_buf(struct tty_port *port); 491extern void tty_port_free_xmit_buf(struct tty_port *port); 492extern void tty_port_put(struct tty_port *port); 493 494static inline struct tty_port *tty_port_get(struct tty_port *port) 495{ 496 if (port) 497 kref_get(&port->kref); 498 return port; 499} 500 501extern struct tty_struct *tty_port_tty_get(struct tty_port *port); 502extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); 503extern int tty_port_carrier_raised(struct tty_port *port); 504extern void tty_port_raise_dtr_rts(struct tty_port *port); 505extern void tty_port_lower_dtr_rts(struct tty_port *port); 506extern void tty_port_hangup(struct tty_port *port); 507extern int tty_port_block_til_ready(struct tty_port *port, 508 struct tty_struct *tty, struct file *filp); 509extern int tty_port_close_start(struct tty_port *port, 510 struct tty_struct *tty, struct file *filp); 511extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); 512extern void tty_port_close(struct tty_port *port, 513 struct tty_struct *tty, struct file *filp); 514extern int tty_port_open(struct tty_port *port, 515 struct tty_struct *tty, struct file *filp); 516static inline int tty_port_users(struct tty_port *port) 517{ 518 return port->count + port->blocked_open; 519} 520 521extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); 522extern int tty_unregister_ldisc(int disc); 523extern int tty_set_ldisc(struct tty_struct *tty, int ldisc); 524extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); 525extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty); 526extern void tty_ldisc_init(struct tty_struct *tty); 527extern void tty_ldisc_begin(void); 528/* This last one is just for the tty layer internals and shouldn't be used elsewhere */ 529extern void tty_ldisc_enable(struct tty_struct *tty); 530 531 532/* n_tty.c */ 533extern struct tty_ldisc_ops tty_ldisc_N_TTY; 534extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); 535 536/* tty_audit.c */ 537#ifdef CONFIG_AUDIT 538extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, 539 size_t size); 540extern void tty_audit_exit(void); 541extern void tty_audit_fork(struct signal_struct *sig); 542extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); 543extern void tty_audit_push(struct tty_struct *tty); 544extern int tty_audit_push_task(struct task_struct *tsk, 545 uid_t loginuid, u32 sessionid); 546#else 547static inline void tty_audit_add_data(struct tty_struct *tty, 548 unsigned char *data, size_t size) 549{ 550} 551static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) 552{ 553} 554static inline void tty_audit_exit(void) 555{ 556} 557static inline void tty_audit_fork(struct signal_struct *sig) 558{ 559} 560static inline void tty_audit_push(struct tty_struct *tty) 561{ 562} 563static inline int tty_audit_push_task(struct task_struct *tsk, 564 uid_t loginuid, u32 sessionid) 565{ 566 return 0; 567} 568#endif 569 570/* tty_io.c */ 571extern int __init tty_init(void); 572 573/* tty_ioctl.c */ 574extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, 575 unsigned int cmd, unsigned long arg); 576 577/* serial.c */ 578 579extern void serial_console_init(void); 580 581/* pcxx.c */ 582 583extern int pcxe_open(struct tty_struct *tty, struct file *filp); 584 585/* vt.c */ 586 587extern int vt_ioctl(struct tty_struct *tty, struct file *file, 588 unsigned int cmd, unsigned long arg); 589 590extern long vt_compat_ioctl(struct tty_struct *tty, struct file * file, 591 unsigned int cmd, unsigned long arg); 592 593/* tty_mutex.c */ 594/* functions for preparation of BKL removal */ 595extern void __lockfunc tty_lock(void) __acquires(tty_lock); 596extern void __lockfunc tty_unlock(void) __releases(tty_lock); 597extern struct task_struct *__big_tty_mutex_owner; 598#define tty_locked() (current == __big_tty_mutex_owner) 599 600/* 601 * wait_event_interruptible_tty -- wait for a condition with the tty lock held 602 * 603 * The condition we are waiting for might take a long time to 604 * become true, or might depend on another thread taking the 605 * BTM. In either case, we need to drop the BTM to guarantee 606 * forward progress. This is a leftover from the conversion 607 * from the BKL and should eventually get removed as the BTM 608 * falls out of use. 609 * 610 * Do not use in new code. 611 */ 612#define wait_event_interruptible_tty(wq, condition) \ 613({ \ 614 int __ret = 0; \ 615 if (!(condition)) { \ 616 __wait_event_interruptible_tty(wq, condition, __ret); \ 617 } \ 618 __ret; \ 619}) 620 621#define __wait_event_interruptible_tty(wq, condition, ret) \ 622do { \ 623 DEFINE_WAIT(__wait); \ 624 \ 625 for (;;) { \ 626 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \ 627 if (condition) \ 628 break; \ 629 if (!signal_pending(current)) { \ 630 tty_unlock(); \ 631 schedule(); \ 632 tty_lock(); \ 633 continue; \ 634 } \ 635 ret = -ERESTARTSYS; \ 636 break; \ 637 } \ 638 finish_wait(&wq, &__wait); \ 639} while (0) 640 641 642#endif /* __KERNEL__ */ 643#endif 644