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 /*
   9  * These constants are also useful for user-level apps (e.g., VC
  10  * resizing).
  11  */
  12 #define MIN_NR_CONSOLES 1       /* must be at least 1 */
  13 #define MAX_NR_CONSOLES 63      /* serial lines start at 64 */
  14 #define MAX_NR_USER_CONSOLES 63 /* must be root to allocate above this */
  15                 /* Note: the ioctl VT_GETSTATE does not work for
  16                    consoles 16 and higher (since it returns a short) */
  17
  18 #ifdef __KERNEL__
  19 #include <linux/config.h>
  20 #include <linux/fs.h>
  21 #include <linux/major.h>
  22 #include <linux/termios.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/tty_driver.h>
  25 #include <linux/tty_ldisc.h>
  26 #include <linux/screen_info.h>
  27 #include <linux/mutex.h>
  28
  29 #include <asm/system.h>
  30
  31
  32 /*
  33  * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
  34  * hardcoded at present.)
  35  */
  36 #define NR_PTYS CONFIG_LEGACY_PTY_COUNT   /* Number of legacy ptys */
  37 #define NR_UNIX98_PTY_DEFAULT   4096      /* Default maximum for Unix98 ptys */
  38 #define NR_UNIX98_PTY_MAX       (1 << MINORBITS) /* Absolute limit */
  39 #define NR_LDISCS               16
  40
  41 /*
  42  * This character is the same as _POSIX_VDISABLE: it cannot be used as
  43  * a c_cc[] character, but indicates that a particular special character
  44  * isn't in use (eg VINTR has no character etc)
  45  */
  46 #define __DISABLED_CHAR '\0'
  47
  48 /*
  49  * This is the flip buffer used for the tty driver.  The buffer is
  50  * located in the tty structure, and is used as a high speed interface
  51  * between the tty driver and the tty line discipline.
  52  */
  53 #define TTY_FLIPBUF_SIZE 512
  54
  55 struct tty_buffer {
  56         struct tty_buffer *next;
  57         char *char_buf_ptr;
  58         unsigned char *flag_buf_ptr;
  59         int used;
  60         int size;
  61         int active;
  62         int commit;
  63         int read;
  64         /* Data points here */
  65         unsigned long data[0];
  66 };
  67
  68 struct tty_bufhead {
  69         struct work_struct              work;
  70         struct semaphore pty_sem;
  71         spinlock_t lock;
  72         struct tty_buffer *head;        /* Queue head */
  73         struct tty_buffer *tail;        /* Active buffer */
  74         struct tty_buffer *free;        /* Free queue head */
  75 };
  76 /*
  77  * The pty uses char_buf and flag_buf as a contiguous buffer
  78  */
  79 #define PTY_BUF_SIZE    4*TTY_FLIPBUF_SIZE
  80
  81 /*
  82  * When a break, frame error, or parity error happens, these codes are
  83  * stuffed into the flags buffer.
  84  */
  85 #define TTY_NORMAL      0
  86 #define TTY_BREAK       1
  87 #define TTY_FRAME       2
  88 #define TTY_PARITY      3
  89 #define TTY_OVERRUN     4
  90
  91 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
  92 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
  93 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
  94 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
  95 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
  96 #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
  97 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
  98 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
  99 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
 100 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
 101 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
 102 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
 103 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
 104 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
 105 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
 106 #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
 107 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
 108
 109 #define _I_FLAG(tty,f)  ((tty)->termios->c_iflag & (f))
 110 #define _O_FLAG(tty,f)  ((tty)->termios->c_oflag & (f))
 111 #define _C_FLAG(tty,f)  ((tty)->termios->c_cflag & (f))
 112 #define _L_FLAG(tty,f)  ((tty)->termios->c_lflag & (f))
 113
 114 #define I_IGNBRK(tty)   _I_FLAG((tty),IGNBRK)
 115 #define I_BRKINT(tty)   _I_FLAG((tty),BRKINT)
 116 #define I_IGNPAR(tty)   _I_FLAG((tty),IGNPAR)
 117 #define I_PARMRK(tty)   _I_FLAG((tty),PARMRK)
 118 #define I_INPCK(tty)    _I_FLAG((tty),INPCK)
 119 #define I_ISTRIP(tty)   _I_FLAG((tty),ISTRIP)
 120 #define I_INLCR(tty)    _I_FLAG((tty),INLCR)
 121 #define I_IGNCR(tty)    _I_FLAG((tty),IGNCR)
 122 #define I_ICRNL(tty)    _I_FLAG((tty),ICRNL)
 123 #define I_IUCLC(tty)    _I_FLAG((tty),IUCLC)
 124 #define I_IXON(tty)     _I_FLAG((tty),IXON)
 125 #define I_IXANY(tty)    _I_FLAG((tty),IXANY)
 126 #define I_IXOFF(tty)    _I_FLAG((tty),IXOFF)
 127 #define I_IMAXBEL(tty)  _I_FLAG((tty),IMAXBEL)
 128 #define I_IUTF8(tty)    _I_FLAG((tty),IUTF8)
 129
 130 #define O_OPOST(tty)    _O_FLAG((tty),OPOST)
 131 #define O_OLCUC(tty)    _O_FLAG((tty),OLCUC)
 132 #define O_ONLCR(tty)    _O_FLAG((tty),ONLCR)
 133 #define O_OCRNL(tty)    _O_FLAG((tty),OCRNL)
 134 #define O_ONOCR(tty)    _O_FLAG((tty),ONOCR)
 135 #define O_ONLRET(tty)   _O_FLAG((tty),ONLRET)
 136 #define O_OFILL(tty)    _O_FLAG((tty),OFILL)
 137 #define O_OFDEL(tty)    _O_FLAG((tty),OFDEL)
 138 #define O_NLDLY(tty)    _O_FLAG((tty),NLDLY)
 139 #define O_CRDLY(tty)    _O_FLAG((tty),CRDLY)
 140 #define O_TABDLY(tty)   _O_FLAG((tty),TABDLY)
 141 #define O_BSDLY(tty)    _O_FLAG((tty),BSDLY)
 142 #define O_VTDLY(tty)    _O_FLAG((tty),VTDLY)
 143 #define O_FFDLY(tty)    _O_FLAG((tty),FFDLY)
 144
 145 #define C_BAUD(tty)     _C_FLAG((tty),CBAUD)
 146 #define C_CSIZE(tty)    _C_FLAG((tty),CSIZE)
 147 #define C_CSTOPB(tty)   _C_FLAG((tty),CSTOPB)
 148 #define C_CREAD(tty)    _C_FLAG((tty),CREAD)
 149 #define C_PARENB(tty)   _C_FLAG((tty),PARENB)
 150 #define C_PARODD(tty)   _C_FLAG((tty),PARODD)
 151 #define C_HUPCL(tty)    _C_FLAG((tty),HUPCL)
 152 #define C_CLOCAL(tty)   _C_FLAG((tty),CLOCAL)
 153 #define C_CIBAUD(tty)   _C_FLAG((tty),CIBAUD)
 154 #define C_CRTSCTS(tty)  _C_FLAG((tty),CRTSCTS)
 155
 156 #define L_ISIG(tty)     _L_FLAG((tty),ISIG)
 157 #define L_ICANON(tty)   _L_FLAG((tty),ICANON)
 158 #define L_XCASE(tty)    _L_FLAG((tty),XCASE)
 159 #define L_ECHO(tty)     _L_FLAG((tty),ECHO)
 160 #define L_ECHOE(tty)    _L_FLAG((tty),ECHOE)
 161 #define L_ECHOK(tty)    _L_FLAG((tty),ECHOK)
 162 #define L_ECHONL(tty)   _L_FLAG((tty),ECHONL)
 163 #define L_NOFLSH(tty)   _L_FLAG((tty),NOFLSH)
 164 #define L_TOSTOP(tty)   _L_FLAG((tty),TOSTOP)
 165 #define L_ECHOCTL(tty)  _L_FLAG((tty),ECHOCTL)
 166 #define L_ECHOPRT(tty)  _L_FLAG((tty),ECHOPRT)
 167 #define L_ECHOKE(tty)   _L_FLAG((tty),ECHOKE)
 168 #define L_FLUSHO(tty)   _L_FLAG((tty),FLUSHO)
 169 #define L_PENDIN(tty)   _L_FLAG((tty),PENDIN)
 170 #define L_IEXTEN(tty)   _L_FLAG((tty),IEXTEN)
 171
 172 struct device;
 173 /*
 174  * Where all of the state associated with a tty is kept while the tty
 175  * is open.  Since the termios state should be kept even if the tty
 176  * has been closed --- for things like the baud rate, etc --- it is
 177  * not stored here, but rather a pointer to the real state is stored
 178  * here.  Possible the winsize structure should have the same
 179  * treatment, but (1) the default 80x24 is usually right and (2) it's
 180  * most often used by a windowing system, which will set the correct
 181  * size each time the window is created or resized anyway.
 182  *                                              - TYT, 9/14/92
 183  */
 184 struct tty_struct {
 185         int     magic;
 186         struct tty_driver *driver;
 187         int index;
 188         struct tty_ldisc ldisc;
 189         struct semaphore termios_sem;
 190         struct termios *termios, *termios_locked;
 191         char name[64];
 192         int pgrp;
 193         int session;
 194         unsigned long flags;
 195         int count;
 196         struct winsize winsize;
 197         unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
 198         unsigned char low_latency:1, warned:1;
 199         unsigned char ctrl_status;
 200         unsigned int receive_room;      /* Bytes free for queue */
 201
 202         struct tty_struct *link;
 203         struct fasync_struct *fasync;
 204         struct tty_bufhead buf;
 205         int max_flip_cnt;
 206         int alt_speed;          /* For magic substitution of 38400 bps */
 207         wait_queue_head_t write_wait;
 208         wait_queue_head_t read_wait;
 209         struct work_struct hangup_work;
 210         void *disc_data;
 211         void *driver_data;
 212         struct list_head tty_files;
 213
 214 #define N_TTY_BUF_SIZE 4096
 215
 216         /*
 217          * The following is data for the N_TTY line discipline.  For
 218          * historical reasons, this is included in the tty structure.
 219          */
 220         unsigned int column;
 221         unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
 222         unsigned char closing:1;
 223         unsigned short minimum_to_wake;
 224         unsigned long overrun_time;
 225         int num_overrun;
 226         unsigned long process_char_map[256/(8*sizeof(unsigned long))];
 227         char *read_buf;
 228         int read_head;
 229         int read_tail;
 230         int read_cnt;
 231         unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
 232         int canon_data;
 233         unsigned long canon_head;
 234         unsigned int canon_column;
 235         struct mutex atomic_read_lock;
 236         struct mutex atomic_write_lock;
 237         unsigned char *write_buf;
 238         int write_cnt;
 239         spinlock_t read_lock;
 240         /* If the tty has a pending do_SAK, queue it here - akpm */
 241         struct work_struct SAK_work;
 242 };
 243
 244 /* tty magic number */
 245 #define TTY_MAGIC               0x5401
 246
 247 /*
 248  * These bits are used in the flags field of the tty structure.
 249  *
 250  * So that interrupts won't be able to mess up the queues,
 251  * copy_to_cooked must be atomic with respect to itself, as must
 252  * tty->write.  Thus, you must use the inline functions set_bit() and
 253  * clear_bit() to make things atomic.
 254  */
 255 #define TTY_THROTTLED           0       /* Call unthrottle() at threshold min */
 256 #define TTY_IO_ERROR            1       /* Canse an I/O error (may be no ldisc too) */
 257 #define TTY_OTHER_CLOSED        2       /* Other side (if any) has closed */
 258 #define TTY_EXCLUSIVE           3       /* Exclusive open mode */
 259 #define TTY_DEBUG               4       /* Debugging */
 260 #define TTY_DO_WRITE_WAKEUP     5       /* Call write_wakeup after queuing new */
 261 #define TTY_PUSH                6       /* n_tty private */
 262 #define TTY_CLOSING             7       /* ->close() in progress */
 263 #define TTY_DONT_FLIP           8       /* Defer buffer flip */
 264 #define TTY_LDISC               9       /* Line discipline attached */
 265 #define TTY_HW_COOK_OUT         14      /* Hardware can do output cooking */
 266 #define TTY_HW_COOK_IN          15      /* Hardware can do input cooking */
 267 #define TTY_PTY_LOCK            16      /* pty private */
 268 #define TTY_NO_WRITE_SPLIT      17      /* Preserve write boundaries to driver */
 269 #define TTY_HUPPED              18      /* Post driver->hangup() */
 270
 271 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
 272
 273 extern void tty_write_flush(struct tty_struct *);
 274
 275 extern struct termios tty_std_termios;
 276 extern int fg_console, last_console, want_console;
 277
 278 extern int kmsg_redirect;
 279
 280 extern void console_init(void);
 281 extern int vcs_init(void);
 282
 283 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
 284                               const char *routine);
 285 extern char *tty_name(struct tty_struct *tty, char *buf);
 286 extern void tty_wait_until_sent(struct tty_struct * tty, long timeout);
 287 extern int tty_check_change(struct tty_struct * tty);
 288 extern void stop_tty(struct tty_struct * tty);
 289 extern void start_tty(struct tty_struct * tty);
 290 extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc);
 291 extern int tty_unregister_ldisc(int disc);
 292 extern int tty_register_driver(struct tty_driver *driver);
 293 extern int tty_unregister_driver(struct tty_driver *driver);
 294 extern void tty_register_device(struct tty_driver *driver, unsigned index, struct device *dev);
 295 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
 296 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
 297                              int buflen);
 298 extern void tty_write_message(struct tty_struct *tty, char *msg);
 299
 300 extern int is_orphaned_pgrp(int pgrp);
 301 extern int is_ignored(int sig);
 302 extern int tty_signal(int sig, struct tty_struct *tty);
 303 extern void tty_hangup(struct tty_struct * tty);
 304 extern void tty_vhangup(struct tty_struct * tty);
 305 extern void tty_unhangup(struct file *filp);
 306 extern int tty_hung_up_p(struct file * filp);
 307 extern void do_SAK(struct tty_struct *tty);
 308 extern void disassociate_ctty(int priv);
 309 extern void tty_flip_buffer_push(struct tty_struct *tty);
 310 extern int tty_get_baud_rate(struct tty_struct *tty);
 311 extern int tty_termios_baud_rate(struct termios *termios);
 312
 313 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
 314 extern void tty_ldisc_deref(struct tty_ldisc *);
 315 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
 316
 317 extern struct tty_ldisc *tty_ldisc_get(int);
 318 extern void tty_ldisc_put(int);
 319
 320 extern void tty_wakeup(struct tty_struct *tty);
 321 extern void tty_ldisc_flush(struct tty_struct *tty);
 322
 323 extern struct mutex tty_mutex;
 324
 325 /* n_tty.c */
 326 extern struct tty_ldisc tty_ldisc_N_TTY;
 327
 328 /* tty_ioctl.c */
 329 extern int n_tty_ioctl(struct tty_struct * tty, struct file * file,
 330                        unsigned int cmd, unsigned long arg);
 331
 332 /* serial.c */
 333
 334 extern void serial_console_init(void);
 335
 336 /* pcxx.c */
 337
 338 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
 339
 340 /* printk.c */
 341
 342 extern void console_print(const char *);
 343
 344 /* vt.c */
 345
 346 extern int vt_ioctl(struct tty_struct *tty, struct file * file,
 347                     unsigned int cmd, unsigned long arg);
 348
 349 static inline dev_t tty_devnum(struct tty_struct *tty)
 350 {
 351         return MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index;
 352 }
 353
 354 #endif /* __KERNEL__ */
 355 #endif