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