include/linux/tty.h

   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 <kaz@cafe.net> */
  39 #define N_R3964         9       /* Reserved for Simatic R3964 module */
  40 #define N_PROFIBUS_FDL  10      /* Reserved for Profibus <Dave@mvhi.com> */
  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