tty.h revision 2cb4ca0208722836e921d5ba780b09f29d4026b8
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#define NR_LDISCS 30 9 10/* line disciplines */ 11#define N_TTY 0 12#define N_SLIP 1 13#define N_MOUSE 2 14#define N_PPP 3 15#define N_STRIP 4 16#define N_AX25 5 17#define N_X25 6 /* X.25 async */ 18#define N_6PACK 7 19#define N_MASC 8 /* Reserved for Mobitex module <kaz@cafe.net> */ 20#define N_R3964 9 /* Reserved for Simatic R3964 module */ 21#define N_PROFIBUS_FDL 10 /* Reserved for Profibus */ 22#define N_IRDA 11 /* Linux IrDa - http://irda.sourceforge.net/ */ 23#define N_SMSBLOCK 12 /* SMS block mode - for talking to GSM data */ 24 /* cards about SMS messages */ 25#define N_HDLC 13 /* synchronous HDLC */ 26#define N_SYNC_PPP 14 /* synchronous PPP */ 27#define N_HCI 15 /* Bluetooth HCI UART */ 28#define N_GIGASET_M101 16 /* Siemens Gigaset M101 serial DECT adapter */ 29#define N_SLCAN 17 /* Serial / USB serial CAN Adaptors */ 30#define N_PPS 18 /* Pulse per Second */ 31#define N_V253 19 /* Codec control over voice modem */ 32#define N_CAIF 20 /* CAIF protocol for talking to modems */ 33#define N_GSM0710 21 /* GSM 0710 Mux */ 34#define N_TI_WL 22 /* for TI's WL BT, FM, GPS combo chips */ 35#define N_TRACESINK 23 /* Trace data routing for MIPI P1149.7 */ 36#define N_TRACEROUTER 24 /* Trace data routing for MIPI P1149.7 */ 37 38#ifdef __KERNEL__ 39#include <linux/fs.h> 40#include <linux/major.h> 41#include <linux/termios.h> 42#include <linux/workqueue.h> 43#include <linux/tty_driver.h> 44#include <linux/tty_ldisc.h> 45#include <linux/mutex.h> 46 47 48 49/* 50 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are 51 * hardcoded at present.) 52 */ 53#define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ 54#define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */ 55#define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ 56 57/* 58 * This character is the same as _POSIX_VDISABLE: it cannot be used as 59 * a c_cc[] character, but indicates that a particular special character 60 * isn't in use (eg VINTR has no character etc) 61 */ 62#define __DISABLED_CHAR '\0' 63 64struct tty_buffer { 65 struct tty_buffer *next; 66 char *char_buf_ptr; 67 unsigned char *flag_buf_ptr; 68 int used; 69 int size; 70 int commit; 71 int read; 72 /* Data points here */ 73 unsigned long data[0]; 74}; 75 76/* 77 * We default to dicing tty buffer allocations to this many characters 78 * in order to avoid multiple page allocations. We know the size of 79 * tty_buffer itself but it must also be taken into account that the 80 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation 81 * logic this must match 82 */ 83 84#define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF) 85 86 87struct tty_bufhead { 88 struct work_struct work; 89 spinlock_t lock; 90 struct tty_buffer *head; /* Queue head */ 91 struct tty_buffer *tail; /* Active buffer */ 92 struct tty_buffer *free; /* Free queue head */ 93 int memory_used; /* Buffer space used excluding 94 free queue */ 95}; 96/* 97 * When a break, frame error, or parity error happens, these codes are 98 * stuffed into the flags buffer. 99 */ 100#define TTY_NORMAL 0 101#define TTY_BREAK 1 102#define TTY_FRAME 2 103#define TTY_PARITY 3 104#define TTY_OVERRUN 4 105 106#define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR]) 107#define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT]) 108#define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE]) 109#define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL]) 110#define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF]) 111#define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME]) 112#define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN]) 113#define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC]) 114#define START_CHAR(tty) ((tty)->termios.c_cc[VSTART]) 115#define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP]) 116#define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP]) 117#define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL]) 118#define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT]) 119#define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD]) 120#define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE]) 121#define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT]) 122#define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2]) 123 124#define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f)) 125#define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f)) 126#define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f)) 127#define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f)) 128 129#define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK) 130#define I_BRKINT(tty) _I_FLAG((tty), BRKINT) 131#define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR) 132#define I_PARMRK(tty) _I_FLAG((tty), PARMRK) 133#define I_INPCK(tty) _I_FLAG((tty), INPCK) 134#define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP) 135#define I_INLCR(tty) _I_FLAG((tty), INLCR) 136#define I_IGNCR(tty) _I_FLAG((tty), IGNCR) 137#define I_ICRNL(tty) _I_FLAG((tty), ICRNL) 138#define I_IUCLC(tty) _I_FLAG((tty), IUCLC) 139#define I_IXON(tty) _I_FLAG((tty), IXON) 140#define I_IXANY(tty) _I_FLAG((tty), IXANY) 141#define I_IXOFF(tty) _I_FLAG((tty), IXOFF) 142#define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL) 143#define I_IUTF8(tty) _I_FLAG((tty), IUTF8) 144 145#define O_OPOST(tty) _O_FLAG((tty), OPOST) 146#define O_OLCUC(tty) _O_FLAG((tty), OLCUC) 147#define O_ONLCR(tty) _O_FLAG((tty), ONLCR) 148#define O_OCRNL(tty) _O_FLAG((tty), OCRNL) 149#define O_ONOCR(tty) _O_FLAG((tty), ONOCR) 150#define O_ONLRET(tty) _O_FLAG((tty), ONLRET) 151#define O_OFILL(tty) _O_FLAG((tty), OFILL) 152#define O_OFDEL(tty) _O_FLAG((tty), OFDEL) 153#define O_NLDLY(tty) _O_FLAG((tty), NLDLY) 154#define O_CRDLY(tty) _O_FLAG((tty), CRDLY) 155#define O_TABDLY(tty) _O_FLAG((tty), TABDLY) 156#define O_BSDLY(tty) _O_FLAG((tty), BSDLY) 157#define O_VTDLY(tty) _O_FLAG((tty), VTDLY) 158#define O_FFDLY(tty) _O_FLAG((tty), FFDLY) 159 160#define C_BAUD(tty) _C_FLAG((tty), CBAUD) 161#define C_CSIZE(tty) _C_FLAG((tty), CSIZE) 162#define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB) 163#define C_CREAD(tty) _C_FLAG((tty), CREAD) 164#define C_PARENB(tty) _C_FLAG((tty), PARENB) 165#define C_PARODD(tty) _C_FLAG((tty), PARODD) 166#define C_HUPCL(tty) _C_FLAG((tty), HUPCL) 167#define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL) 168#define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD) 169#define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS) 170 171#define L_ISIG(tty) _L_FLAG((tty), ISIG) 172#define L_ICANON(tty) _L_FLAG((tty), ICANON) 173#define L_XCASE(tty) _L_FLAG((tty), XCASE) 174#define L_ECHO(tty) _L_FLAG((tty), ECHO) 175#define L_ECHOE(tty) _L_FLAG((tty), ECHOE) 176#define L_ECHOK(tty) _L_FLAG((tty), ECHOK) 177#define L_ECHONL(tty) _L_FLAG((tty), ECHONL) 178#define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH) 179#define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP) 180#define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL) 181#define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT) 182#define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE) 183#define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO) 184#define L_PENDIN(tty) _L_FLAG((tty), PENDIN) 185#define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN) 186#define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC) 187 188struct device; 189struct signal_struct; 190 191/* 192 * Port level information. Each device keeps its own port level information 193 * so provide a common structure for those ports wanting to use common support 194 * routines. 195 * 196 * The tty port has a different lifetime to the tty so must be kept apart. 197 * In addition be careful as tty -> port mappings are valid for the life 198 * of the tty object but in many cases port -> tty mappings are valid only 199 * until a hangup so don't use the wrong path. 200 */ 201 202struct tty_port; 203 204struct tty_port_operations { 205 /* Return 1 if the carrier is raised */ 206 int (*carrier_raised)(struct tty_port *port); 207 /* Control the DTR line */ 208 void (*dtr_rts)(struct tty_port *port, int raise); 209 /* Called when the last close completes or a hangup finishes 210 IFF the port was initialized. Do not use to free resources. Called 211 under the port mutex to serialize against activate/shutdowns */ 212 void (*shutdown)(struct tty_port *port); 213 void (*drop)(struct tty_port *port); 214 /* Called under the port mutex from tty_port_open, serialized using 215 the port mutex */ 216 /* FIXME: long term getting the tty argument *out* of this would be 217 good for consoles */ 218 int (*activate)(struct tty_port *port, struct tty_struct *tty); 219 /* Called on the final put of a port */ 220 void (*destruct)(struct tty_port *port); 221}; 222 223struct tty_port { 224 struct tty_struct *tty; /* Back pointer */ 225 const struct tty_port_operations *ops; /* Port operations */ 226 spinlock_t lock; /* Lock protecting tty field */ 227 int blocked_open; /* Waiting to open */ 228 int count; /* Usage count */ 229 wait_queue_head_t open_wait; /* Open waiters */ 230 wait_queue_head_t close_wait; /* Close waiters */ 231 wait_queue_head_t delta_msr_wait; /* Modem status change */ 232 unsigned long flags; /* TTY flags ASY_*/ 233 unsigned char console:1; /* port is a console */ 234 struct mutex mutex; /* Locking */ 235 struct mutex buf_mutex; /* Buffer alloc lock */ 236 unsigned char *xmit_buf; /* Optional buffer */ 237 unsigned int close_delay; /* Close port delay */ 238 unsigned int closing_wait; /* Delay for output */ 239 int drain_delay; /* Set to zero if no pure time 240 based drain is needed else 241 set to size of fifo */ 242 struct kref kref; /* Ref counter */ 243}; 244 245/* 246 * Where all of the state associated with a tty is kept while the tty 247 * is open. Since the termios state should be kept even if the tty 248 * has been closed --- for things like the baud rate, etc --- it is 249 * not stored here, but rather a pointer to the real state is stored 250 * here. Possible the winsize structure should have the same 251 * treatment, but (1) the default 80x24 is usually right and (2) it's 252 * most often used by a windowing system, which will set the correct 253 * size each time the window is created or resized anyway. 254 * - TYT, 9/14/92 255 */ 256 257struct tty_operations; 258 259struct tty_struct { 260 int magic; 261 struct kref kref; 262 struct device *dev; 263 struct tty_driver *driver; 264 const struct tty_operations *ops; 265 int index; 266 267 /* Protects ldisc changes: Lock tty not pty */ 268 struct mutex ldisc_mutex; 269 struct tty_ldisc *ldisc; 270 271 struct mutex legacy_mutex; 272 struct mutex termios_mutex; 273 spinlock_t ctrl_lock; 274 /* Termios values are protected by the termios mutex */ 275 struct ktermios termios, termios_locked; 276 struct termiox *termiox; /* May be NULL for unsupported */ 277 char name[64]; 278 struct pid *pgrp; /* Protected by ctrl lock */ 279 struct pid *session; 280 unsigned long flags; 281 int count; 282 struct winsize winsize; /* termios mutex */ 283 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1; 284 unsigned char low_latency:1, warned:1; 285 unsigned char ctrl_status; /* ctrl_lock */ 286 unsigned int receive_room; /* Bytes free for queue */ 287 288 struct tty_struct *link; 289 struct fasync_struct *fasync; 290 struct tty_bufhead buf; /* Locked internally */ 291 int alt_speed; /* For magic substitution of 38400 bps */ 292 wait_queue_head_t write_wait; 293 wait_queue_head_t read_wait; 294 struct work_struct hangup_work; 295 void *disc_data; 296 void *driver_data; 297 struct list_head tty_files; 298 299#define N_TTY_BUF_SIZE 4096 300 301 /* 302 * The following is data for the N_TTY line discipline. For 303 * historical reasons, this is included in the tty structure. 304 * Mostly locked by the BKL. 305 */ 306 unsigned int column; 307 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1; 308 unsigned char closing:1; 309 unsigned char echo_overrun:1; 310 unsigned short minimum_to_wake; 311 unsigned long overrun_time; 312 int num_overrun; 313 unsigned long process_char_map[256/(8*sizeof(unsigned long))]; 314 char *read_buf; 315 int read_head; 316 int read_tail; 317 int read_cnt; 318 unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))]; 319 unsigned char *echo_buf; 320 unsigned int echo_pos; 321 unsigned int echo_cnt; 322 int canon_data; 323 unsigned long canon_head; 324 unsigned int canon_column; 325 struct mutex atomic_read_lock; 326 struct mutex atomic_write_lock; 327 struct mutex output_lock; 328 struct mutex echo_lock; 329 unsigned char *write_buf; 330 int write_cnt; 331 spinlock_t read_lock; 332 /* If the tty has a pending do_SAK, queue it here - akpm */ 333 struct work_struct SAK_work; 334 struct tty_port *port; 335}; 336 337/* Each of a tty's open files has private_data pointing to tty_file_private */ 338struct tty_file_private { 339 struct tty_struct *tty; 340 struct file *file; 341 struct list_head list; 342}; 343 344/* tty magic number */ 345#define TTY_MAGIC 0x5401 346 347/* 348 * These bits are used in the flags field of the tty structure. 349 * 350 * So that interrupts won't be able to mess up the queues, 351 * copy_to_cooked must be atomic with respect to itself, as must 352 * tty->write. Thus, you must use the inline functions set_bit() and 353 * clear_bit() to make things atomic. 354 */ 355#define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ 356#define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */ 357#define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ 358#define TTY_EXCLUSIVE 3 /* Exclusive open mode */ 359#define TTY_DEBUG 4 /* Debugging */ 360#define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ 361#define TTY_PUSH 6 /* n_tty private */ 362#define TTY_CLOSING 7 /* ->close() in progress */ 363#define TTY_LDISC 9 /* Line discipline attached */ 364#define TTY_LDISC_CHANGING 10 /* Line discipline changing */ 365#define TTY_LDISC_OPEN 11 /* Line discipline is open */ 366#define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */ 367#define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */ 368#define TTY_PTY_LOCK 16 /* pty private */ 369#define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ 370#define TTY_HUPPED 18 /* Post driver->hangup() */ 371#define TTY_FLUSHING 19 /* Flushing to ldisc in progress */ 372#define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */ 373#define TTY_HUPPING 21 /* ->hangup() in progress */ 374 375#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty)) 376 377extern void tty_write_flush(struct tty_struct *); 378 379extern struct ktermios tty_std_termios; 380 381extern void console_init(void); 382extern int vcs_init(void); 383 384extern struct class *tty_class; 385 386/** 387 * tty_kref_get - get a tty reference 388 * @tty: tty device 389 * 390 * Return a new reference to a tty object. The caller must hold 391 * sufficient locks/counts to ensure that their existing reference cannot 392 * go away 393 */ 394 395static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) 396{ 397 if (tty) 398 kref_get(&tty->kref); 399 return tty; 400} 401extern void tty_kref_put(struct tty_struct *tty); 402 403extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, 404 const char *routine); 405extern char *tty_name(struct tty_struct *tty, char *buf); 406extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); 407extern int tty_check_change(struct tty_struct *tty); 408extern void stop_tty(struct tty_struct *tty); 409extern void start_tty(struct tty_struct *tty); 410extern int tty_register_driver(struct tty_driver *driver); 411extern int tty_unregister_driver(struct tty_driver *driver); 412extern struct device *tty_register_device(struct tty_driver *driver, 413 unsigned index, struct device *dev); 414extern void tty_unregister_device(struct tty_driver *driver, unsigned index); 415extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp, 416 int buflen); 417extern void tty_write_message(struct tty_struct *tty, char *msg); 418extern int tty_put_char(struct tty_struct *tty, unsigned char c); 419extern int tty_chars_in_buffer(struct tty_struct *tty); 420extern int tty_write_room(struct tty_struct *tty); 421extern void tty_driver_flush_buffer(struct tty_struct *tty); 422extern void tty_throttle(struct tty_struct *tty); 423extern void tty_unthrottle(struct tty_struct *tty); 424extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); 425extern void tty_driver_remove_tty(struct tty_driver *driver, 426 struct tty_struct *tty); 427extern void tty_free_termios(struct tty_struct *tty); 428extern int is_current_pgrp_orphaned(void); 429extern struct pid *tty_get_pgrp(struct tty_struct *tty); 430extern int is_ignored(int sig); 431extern int tty_signal(int sig, struct tty_struct *tty); 432extern void tty_hangup(struct tty_struct *tty); 433extern void tty_vhangup(struct tty_struct *tty); 434extern void tty_vhangup_locked(struct tty_struct *tty); 435extern void tty_vhangup_self(void); 436extern void tty_unhangup(struct file *filp); 437extern int tty_hung_up_p(struct file *filp); 438extern void do_SAK(struct tty_struct *tty); 439extern void __do_SAK(struct tty_struct *tty); 440extern void disassociate_ctty(int priv); 441extern void no_tty(void); 442extern void tty_flip_buffer_push(struct tty_struct *tty); 443extern void tty_flush_to_ldisc(struct tty_struct *tty); 444extern void tty_buffer_free_all(struct tty_struct *tty); 445extern void tty_buffer_flush(struct tty_struct *tty); 446extern void tty_buffer_init(struct tty_struct *tty); 447extern speed_t tty_get_baud_rate(struct tty_struct *tty); 448extern speed_t tty_termios_baud_rate(struct ktermios *termios); 449extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); 450extern void tty_termios_encode_baud_rate(struct ktermios *termios, 451 speed_t ibaud, speed_t obaud); 452extern void tty_encode_baud_rate(struct tty_struct *tty, 453 speed_t ibaud, speed_t obaud); 454extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); 455extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b); 456extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt); 457 458extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); 459extern void tty_ldisc_deref(struct tty_ldisc *); 460extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); 461extern void tty_ldisc_hangup(struct tty_struct *tty); 462extern const struct file_operations tty_ldiscs_proc_fops; 463 464extern void tty_wakeup(struct tty_struct *tty); 465extern void tty_ldisc_flush(struct tty_struct *tty); 466 467extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 468extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, 469 unsigned int cmd, unsigned long arg); 470extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); 471extern dev_t tty_devnum(struct tty_struct *tty); 472extern void proc_clear_tty(struct task_struct *p); 473extern struct tty_struct *get_current_tty(void); 474extern void tty_default_fops(struct file_operations *fops); 475extern struct tty_struct *alloc_tty_struct(void); 476extern int tty_alloc_file(struct file *file); 477extern void tty_add_file(struct tty_struct *tty, struct file *file); 478extern void tty_free_file(struct file *file); 479extern void free_tty_struct(struct tty_struct *tty); 480extern void initialize_tty_struct(struct tty_struct *tty, 481 struct tty_driver *driver, int idx); 482extern void deinitialize_tty_struct(struct tty_struct *tty); 483extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx); 484extern int tty_release(struct inode *inode, struct file *filp); 485extern int tty_init_termios(struct tty_struct *tty); 486extern int tty_standard_install(struct tty_driver *driver, 487 struct tty_struct *tty); 488 489extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty); 490extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty); 491 492extern struct mutex tty_mutex; 493extern spinlock_t tty_files_lock; 494 495extern void tty_write_unlock(struct tty_struct *tty); 496extern int tty_write_lock(struct tty_struct *tty, int ndelay); 497#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) 498 499extern void tty_port_init(struct tty_port *port); 500extern void tty_port_link_device(struct tty_port *port, 501 struct tty_driver *driver, unsigned index); 502extern struct device *tty_port_register_device(struct tty_port *port, 503 struct tty_driver *driver, unsigned index, 504 struct device *device); 505extern int tty_port_alloc_xmit_buf(struct tty_port *port); 506extern void tty_port_free_xmit_buf(struct tty_port *port); 507extern void tty_port_put(struct tty_port *port); 508 509static inline struct tty_port *tty_port_get(struct tty_port *port) 510{ 511 if (port) 512 kref_get(&port->kref); 513 return port; 514} 515 516extern struct tty_struct *tty_port_tty_get(struct tty_port *port); 517extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); 518extern int tty_port_carrier_raised(struct tty_port *port); 519extern void tty_port_raise_dtr_rts(struct tty_port *port); 520extern void tty_port_lower_dtr_rts(struct tty_port *port); 521extern void tty_port_hangup(struct tty_port *port); 522extern int tty_port_block_til_ready(struct tty_port *port, 523 struct tty_struct *tty, struct file *filp); 524extern int tty_port_close_start(struct tty_port *port, 525 struct tty_struct *tty, struct file *filp); 526extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); 527extern void tty_port_close(struct tty_port *port, 528 struct tty_struct *tty, struct file *filp); 529extern int tty_port_install(struct tty_port *port, struct tty_driver *driver, 530 struct tty_struct *tty); 531extern int tty_port_open(struct tty_port *port, 532 struct tty_struct *tty, struct file *filp); 533static inline int tty_port_users(struct tty_port *port) 534{ 535 return port->count + port->blocked_open; 536} 537 538extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); 539extern int tty_unregister_ldisc(int disc); 540extern int tty_set_ldisc(struct tty_struct *tty, int ldisc); 541extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); 542extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty); 543extern void tty_ldisc_init(struct tty_struct *tty); 544extern void tty_ldisc_deinit(struct tty_struct *tty); 545extern void tty_ldisc_begin(void); 546/* This last one is just for the tty layer internals and shouldn't be used elsewhere */ 547extern void tty_ldisc_enable(struct tty_struct *tty); 548 549 550/* n_tty.c */ 551extern struct tty_ldisc_ops tty_ldisc_N_TTY; 552extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); 553 554/* tty_audit.c */ 555#ifdef CONFIG_AUDIT 556extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, 557 size_t size); 558extern void tty_audit_exit(void); 559extern void tty_audit_fork(struct signal_struct *sig); 560extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); 561extern void tty_audit_push(struct tty_struct *tty); 562extern int tty_audit_push_task(struct task_struct *tsk, 563 uid_t loginuid, u32 sessionid); 564#else 565static inline void tty_audit_add_data(struct tty_struct *tty, 566 unsigned char *data, size_t size) 567{ 568} 569static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) 570{ 571} 572static inline void tty_audit_exit(void) 573{ 574} 575static inline void tty_audit_fork(struct signal_struct *sig) 576{ 577} 578static inline void tty_audit_push(struct tty_struct *tty) 579{ 580} 581static inline int tty_audit_push_task(struct task_struct *tsk, 582 uid_t loginuid, u32 sessionid) 583{ 584 return 0; 585} 586#endif 587 588/* tty_io.c */ 589extern int __init tty_init(void); 590 591/* tty_ioctl.c */ 592extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, 593 unsigned int cmd, unsigned long arg); 594extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, 595 unsigned int cmd, unsigned long arg); 596 597/* serial.c */ 598 599extern void serial_console_init(void); 600 601/* pcxx.c */ 602 603extern int pcxe_open(struct tty_struct *tty, struct file *filp); 604 605/* vt.c */ 606 607extern int vt_ioctl(struct tty_struct *tty, 608 unsigned int cmd, unsigned long arg); 609 610extern long vt_compat_ioctl(struct tty_struct *tty, 611 unsigned int cmd, unsigned long arg); 612 613/* tty_mutex.c */ 614/* functions for preparation of BKL removal */ 615extern void __lockfunc tty_lock(struct tty_struct *tty); 616extern void __lockfunc tty_unlock(struct tty_struct *tty); 617extern void __lockfunc tty_lock_pair(struct tty_struct *tty, 618 struct tty_struct *tty2); 619extern void __lockfunc tty_unlock_pair(struct tty_struct *tty, 620 struct tty_struct *tty2); 621 622/* 623 * this shall be called only from where BTM is held (like close) 624 * 625 * We need this to ensure nobody waits for us to finish while we are waiting. 626 * Without this we were encountering system stalls. 627 * 628 * This should be indeed removed with BTM removal later. 629 * 630 * Locking: BTM required. Nobody is allowed to hold port->mutex. 631 */ 632static inline void tty_wait_until_sent_from_close(struct tty_struct *tty, 633 long timeout) 634{ 635 tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */ 636 tty_wait_until_sent(tty, timeout); 637 tty_lock(tty); 638} 639 640/* 641 * wait_event_interruptible_tty -- wait for a condition with the tty lock held 642 * 643 * The condition we are waiting for might take a long time to 644 * become true, or might depend on another thread taking the 645 * BTM. In either case, we need to drop the BTM to guarantee 646 * forward progress. This is a leftover from the conversion 647 * from the BKL and should eventually get removed as the BTM 648 * falls out of use. 649 * 650 * Do not use in new code. 651 */ 652#define wait_event_interruptible_tty(tty, wq, condition) \ 653({ \ 654 int __ret = 0; \ 655 if (!(condition)) { \ 656 __wait_event_interruptible_tty(tty, wq, condition, __ret); \ 657 } \ 658 __ret; \ 659}) 660 661#define __wait_event_interruptible_tty(tty, wq, condition, ret) \ 662do { \ 663 DEFINE_WAIT(__wait); \ 664 \ 665 for (;;) { \ 666 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \ 667 if (condition) \ 668 break; \ 669 if (!signal_pending(current)) { \ 670 tty_unlock(tty); \ 671 schedule(); \ 672 tty_lock(tty); \ 673 continue; \ 674 } \ 675 ret = -ERESTARTSYS; \ 676 break; \ 677 } \ 678 finish_wait(&wq, &__wait); \ 679} while (0) 680 681 682#endif /* __KERNEL__ */ 683#endif 684