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_PTYS CONFIG_LEGACY_PTY_COUNT /* Number of legacy ptys */ 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 17 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 <[email protected]> */ 39 #define N_R3964 9 /* Reserved for Simatic R3964 module */ 40 #define N_PROFIBUS_FDL 10 /* Reserved for Profibus <[email protected]> */ 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 49 /* 50 * This character is the same as _POSIX_VDISABLE: it cannot be used as 51 * a c_cc[] character, but indicates that a particular special character 52 * isn't in use (eg VINTR has no character etc) 53 */ 54 #define __DISABLED_CHAR '\0' 55 56 /* 57 * This is the flip buffer used for the tty driver. The buffer is 58 * located in the tty structure, and is used as a high speed interface 59 * between the tty driver and the tty line discipline. 60 */ 61 #define TTY_FLIPBUF_SIZE 512 62 63 struct tty_buffer { 64 struct tty_buffer *next; 65 char *char_buf_ptr; 66 unsigned char *flag_buf_ptr; 67 int used; 68 int size; 69 int commit; 70 int read; 71 /* Data points here */ 72 unsigned long data[0]; 73 }; 74 75 struct tty_bufhead { 76 struct delayed_work work; 77 struct semaphore pty_sem; 78 spinlock_t lock; 79 struct tty_buffer *head; /* Queue head */ 80 struct tty_buffer *tail; /* Active buffer */ 81 struct tty_buffer *free; /* Free queue head */ 82 int memory_used; /* Buffer space used excluding free queue */ 83 }; 84 /* 85 * The pty uses char_buf and flag_buf as a contiguous buffer 86 */ 87 #define PTY_BUF_SIZE 4*TTY_FLIPBUF_SIZE 88 89 /* 90 * When a break, frame error, or parity error happens, these codes are 91 * stuffed into the flags buffer. 92 */ 93 #define TTY_NORMAL 0 94 #define TTY_BREAK 1 95 #define TTY_FRAME 2 96 #define TTY_PARITY 3 97 #define TTY_OVERRUN 4 98 99 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR]) 100 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT]) 101 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE]) 102 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL]) 103 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF]) 104 #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME]) 105 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN]) 106 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC]) 107 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART]) 108 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP]) 109 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP]) 110 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL]) 111 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT]) 112 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD]) 113 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE]) 114 #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT]) 115 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2]) 116 117 #define _I_FLAG(tty,f) ((tty)->termios->c_iflag & (f)) 118 #define _O_FLAG(tty,f) ((tty)->termios->c_oflag & (f)) 119 #define _C_FLAG(tty,f) ((tty)->termios->c_cflag & (f)) 120 #define _L_FLAG(tty,f) ((tty)->termios->c_lflag & (f)) 121 122 #define I_IGNBRK(tty) _I_FLAG((tty),IGNBRK) 123 #define I_BRKINT(tty) _I_FLAG((tty),BRKINT) 124 #define I_IGNPAR(tty) _I_FLAG((tty),IGNPAR) 125 #define I_PARMRK(tty) _I_FLAG((tty),PARMRK) 126 #define I_INPCK(tty) _I_FLAG((tty),INPCK) 127 #define I_ISTRIP(tty) _I_FLAG((tty),ISTRIP) 128 #define I_INLCR(tty) _I_FLAG((tty),INLCR) 129 #define I_IGNCR(tty) _I_FLAG((tty),IGNCR) 130 #define I_ICRNL(tty) _I_FLAG((tty),ICRNL) 131 #define I_IUCLC(tty) _I_FLAG((tty),IUCLC) 132 #define I_IXON(tty) _I_FLAG((tty),IXON) 133 #define I_IXANY(tty) _I_FLAG((tty),IXANY) 134 #define I_IXOFF(tty) _I_FLAG((tty),IXOFF) 135 #define I_IMAXBEL(tty) _I_FLAG((tty),IMAXBEL) 136 #define I_IUTF8(tty) _I_FLAG((tty),IUTF8) 137 138 #define O_OPOST(tty) _O_FLAG((tty),OPOST) 139 #define O_OLCUC(tty) _O_FLAG((tty),OLCUC) 140 #define O_ONLCR(tty) _O_FLAG((tty),ONLCR) 141 #define O_OCRNL(tty) _O_FLAG((tty),OCRNL) 142 #define O_ONOCR(tty) _O_FLAG((tty),ONOCR) 143 #define O_ONLRET(tty) _O_FLAG((tty),ONLRET) 144 #define O_OFILL(tty) _O_FLAG((tty),OFILL) 145 #define O_OFDEL(tty) _O_FLAG((tty),OFDEL) 146 #define O_NLDLY(tty) _O_FLAG((tty),NLDLY) 147 #define O_CRDLY(tty) _O_FLAG((tty),CRDLY) 148 #define O_TABDLY(tty) _O_FLAG((tty),TABDLY) 149 #define O_BSDLY(tty) _O_FLAG((tty),BSDLY) 150 #define O_VTDLY(tty) _O_FLAG((tty),VTDLY) 151 #define O_FFDLY(tty) _O_FLAG((tty),FFDLY) 152 153 #define C_BAUD(tty) _C_FLAG((tty),CBAUD) 154 #define C_CSIZE(tty) _C_FLAG((tty),CSIZE) 155 #define C_CSTOPB(tty) _C_FLAG((tty),CSTOPB) 156 #define C_CREAD(tty) _C_FLAG((tty),CREAD) 157 #define C_PARENB(tty) _C_FLAG((tty),PARENB) 158 #define C_PARODD(tty) _C_FLAG((tty),PARODD) 159 #define C_HUPCL(tty) _C_FLAG((tty),HUPCL) 160 #define C_CLOCAL(tty) _C_FLAG((tty),CLOCAL) 161 #define C_CIBAUD(tty) _C_FLAG((tty),CIBAUD) 162 #define C_CRTSCTS(tty) _C_FLAG((tty),CRTSCTS) 163 164 #define L_ISIG(tty) _L_FLAG((tty),ISIG) 165 #define L_ICANON(tty) _L_FLAG((tty),ICANON) 166 #define L_XCASE(tty) _L_FLAG((tty),XCASE) 167 #define L_ECHO(tty) _L_FLAG((tty),ECHO) 168 #define L_ECHOE(tty) _L_FLAG((tty),ECHOE) 169 #define L_ECHOK(tty) _L_FLAG((tty),ECHOK) 170 #define L_ECHONL(tty) _L_FLAG((tty),ECHONL) 171 #define L_NOFLSH(tty) _L_FLAG((tty),NOFLSH) 172 #define L_TOSTOP(tty) _L_FLAG((tty),TOSTOP) 173 #define L_ECHOCTL(tty) _L_FLAG((tty),ECHOCTL) 174 #define L_ECHOPRT(tty) _L_FLAG((tty),ECHOPRT) 175 #define L_ECHOKE(tty) _L_FLAG((tty),ECHOKE) 176 #define L_FLUSHO(tty) _L_FLAG((tty),FLUSHO) 177 #define L_PENDIN(tty) _L_FLAG((tty),PENDIN) 178 #define L_IEXTEN(tty) _L_FLAG((tty),IEXTEN) 179 180 struct device; 181 struct signal_struct; 182 /* 183 * Where all of the state associated with a tty is kept while the tty 184 * is open. Since the termios state should be kept even if the tty 185 * has been closed --- for things like the baud rate, etc --- it is 186 * not stored here, but rather a pointer to the real state is stored 187 * here. Possible the winsize structure should have the same 188 * treatment, but (1) the default 80x24 is usually right and (2) it's 189 * most often used by a windowing system, which will set the correct 190 * size each time the window is created or resized anyway. 191 * - TYT, 9/14/92 192 */ 193 struct tty_struct { 194 int magic; 195 struct tty_driver *driver; 196 int index; 197 struct tty_ldisc ldisc; 198 struct mutex termios_mutex; 199 struct ktermios *termios, *termios_locked; 200 char name[64]; 201 struct pid *pgrp; 202 struct pid *session; 203 unsigned long flags; 204 int count; 205 struct winsize winsize; 206 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1; 207 unsigned char low_latency:1, warned:1; 208 unsigned char ctrl_status; 209 unsigned int receive_room; /* Bytes free for queue */ 210 211 struct tty_struct *link; 212 struct fasync_struct *fasync; 213 struct tty_bufhead buf; 214 int alt_speed; /* For magic substitution of 38400 bps */ 215 wait_queue_head_t write_wait; 216 wait_queue_head_t read_wait; 217 struct work_struct hangup_work; 218 void *disc_data; 219 void *driver_data; 220 struct list_head tty_files; 221 222 #define N_TTY_BUF_SIZE 4096 223 224 /* 225 * The following is data for the N_TTY line discipline. For 226 * historical reasons, this is included in the tty structure. 227 */ 228 unsigned int column; 229 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1; 230 unsigned char closing:1; 231 unsigned short minimum_to_wake; 232 unsigned long overrun_time; 233 int num_overrun; 234 unsigned long process_char_map[256/(8*sizeof(unsigned long))]; 235 char *read_buf; 236 int read_head; 237 int read_tail; 238 int read_cnt; 239 unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))]; 240 int canon_data; 241 unsigned long canon_head; 242 unsigned int canon_column; 243 struct mutex atomic_read_lock; 244 struct mutex atomic_write_lock; 245 unsigned char *write_buf; 246 int write_cnt; 247 spinlock_t read_lock; 248 /* If the tty has a pending do_SAK, queue it here - akpm */ 249 struct work_struct SAK_work; 250 }; 251 252 /* tty magic number */ 253 #define TTY_MAGIC 0x5401 254 255 /* 256 * These bits are used in the flags field of the tty structure. 257 * 258 * So that interrupts won't be able to mess up the queues, 259 * copy_to_cooked must be atomic with respect to itself, as must 260 * tty->write. Thus, you must use the inline functions set_bit() and 261 * clear_bit() to make things atomic. 262 */ 263 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ 264 #define TTY_IO_ERROR 1 /* Canse an I/O error (may be no ldisc too) */ 265 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ 266 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */ 267 #define TTY_DEBUG 4 /* Debugging */ 268 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ 269 #define TTY_PUSH 6 /* n_tty private */ 270 #define TTY_CLOSING 7 /* ->close() in progress */ 271 #define TTY_LDISC 9 /* Line discipline attached */ 272 #define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */ 273 #define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */ 274 #define TTY_PTY_LOCK 16 /* pty private */ 275 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ 276 #define TTY_HUPPED 18 /* Post driver->hangup() */ 277 #define TTY_FLUSHING 19 /* Flushing to ldisc in progress */ 278 #define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */ 279 280 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty)) 281 282 extern void tty_write_flush(struct tty_struct *); 283 284 extern struct ktermios tty_std_termios; 285 286 extern int kmsg_redirect; 287 288 extern void console_init(void); 289 extern int vcs_init(void); 290 291 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, 292 const char *routine); 293 extern char *tty_name(struct tty_struct *tty, char *buf); 294 extern void tty_wait_until_sent(struct tty_struct * tty, long timeout); 295 extern int tty_check_change(struct tty_struct * tty); 296 extern void stop_tty(struct tty_struct * tty); 297 extern void start_tty(struct tty_struct * tty); 298 extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc); 299 extern int tty_unregister_ldisc(int disc); 300 extern int tty_register_driver(struct tty_driver *driver); 301 extern int tty_unregister_driver(struct tty_driver *driver); 302 extern struct device *tty_register_device(struct tty_driver *driver, 303 unsigned index, struct device *dev); 304 extern void tty_unregister_device(struct tty_driver *driver, unsigned index); 305 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp, 306 int buflen); 307 extern void tty_write_message(struct tty_struct *tty, char *msg); 308 309 extern int is_current_pgrp_orphaned(void); 310 extern int is_ignored(int sig); 311 extern int tty_signal(int sig, struct tty_struct *tty); 312 extern void tty_hangup(struct tty_struct * tty); 313 extern void tty_vhangup(struct tty_struct * tty); 314 extern void tty_unhangup(struct file *filp); 315 extern int tty_hung_up_p(struct file * filp); 316 extern int is_tty(struct file *filp); 317 extern void do_SAK(struct tty_struct *tty); 318 extern void __do_SAK(struct tty_struct *tty); 319 extern void disassociate_ctty(int priv); 320 extern void no_tty(void); 321 extern void tty_flip_buffer_push(struct tty_struct *tty); 322 extern speed_t tty_get_baud_rate(struct tty_struct *tty); 323 extern speed_t tty_termios_baud_rate(struct ktermios *termios); 324 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); 325 326 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); 327 extern void tty_ldisc_deref(struct tty_ldisc *); 328 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); 329 330 extern struct tty_ldisc *tty_ldisc_get(int); 331 extern void tty_ldisc_put(int); 332 333 extern void tty_wakeup(struct tty_struct *tty); 334 extern void tty_ldisc_flush(struct tty_struct *tty); 335 336 extern int tty_ioctl(struct inode *inode, struct file *file, unsigned int cmd, 337 unsigned long arg); 338 339 extern dev_t tty_devnum(struct tty_struct *tty); 340 extern void proc_clear_tty(struct task_struct *p); 341 extern struct tty_struct *get_current_tty(void); 342 343 extern struct mutex tty_mutex; 344 345 extern void tty_write_unlock(struct tty_struct *tty); 346 extern int tty_write_lock(struct tty_struct *tty, int ndelay); 347 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) 348 349 350 351 /* n_tty.c */ 352 extern struct tty_ldisc tty_ldisc_N_TTY; 353 354 /* tty_audit.c */ 355 #ifdef CONFIG_AUDIT 356 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, 357 size_t size); 358 extern void tty_audit_exit(void); 359 extern void tty_audit_fork(struct signal_struct *sig); 360 extern void tty_audit_push(struct tty_struct *tty); 361 extern void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid); 362 extern void tty_audit_opening(void); 363 #else 364 static inline void tty_audit_add_data(struct tty_struct *tty, 365 unsigned char *data, size_t size) 366 { 367 } 368 static inline void tty_audit_exit(void) 369 { 370 } 371 static inline void tty_audit_fork(struct signal_struct *sig) 372 { 373 } 374 static inline void tty_audit_push(struct tty_struct *tty) 375 { 376 } 377 static inline void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid) 378 { 379 } 380 static inline void tty_audit_opening(void) 381 { 382 } 383 #endif 384 385 /* tty_ioctl.c */ 386 extern int n_tty_ioctl(struct tty_struct * tty, struct file * file, 387 unsigned int cmd, unsigned long arg); 388 389 /* serial.c */ 390 391 extern void serial_console_init(void); 392 393 /* pcxx.c */ 394 395 extern int pcxe_open(struct tty_struct *tty, struct file *filp); 396 397 /* printk.c */ 398 399 extern void console_print(const char *); 400 401 /* vt.c */ 402 403 extern int vt_ioctl(struct tty_struct *tty, struct file * file, 404 unsigned int cmd, unsigned long arg); 405 406 #endif /* __KERNEL__ */ 407 #endif 408