LXR linux/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_UNIX98_PTY_DEFAULT   4096      /* Default maximum for Unix98 ptys */
  25#define NR_UNIX98_PTY_MAX       (1 << MINORBITS) /* Absolute limit */
  26#define NR_LDISCS               17
  27
  28/* line disciplines */
  29#define N_TTY           0
  30#define N_SLIP          1
  31#define N_MOUSE         2
  32#define N_PPP           3
  33#define N_STRIP         4
  34#define N_AX25          5
  35#define N_X25           6       /* X.25 async */
  36#define N_6PACK         7
  37#define N_MASC          8       /* Reserved for Mobitex module <kaz@cafe.net> */
  38#define N_R3964         9       /* Reserved for Simatic R3964 module */
  39#define N_PROFIBUS_FDL  10      /* Reserved for Profibus <Dave@mvhi.com> */
  40#define N_IRDA          11      /* Linux IrDa - http://irda.sourceforge.net/ */
  41#define N_SMSBLOCK      12      /* SMS block mode - for talking to GSM data */
  42                                /* cards about SMS messages */
  43#define N_HDLC          13      /* synchronous HDLC */
  44#define N_SYNC_PPP      14      /* synchronous PPP */
  45#define N_HCI           15      /* Bluetooth HCI UART */
  46#define N_GIGASET_M101  16      /* Siemens Gigaset M101 serial DECT adapter */
  47
  48/*
  49 * This character is the same as _POSIX_VDISABLE: it cannot be used as
  50 * a c_cc[] character, but indicates that a particular special character
  51 * isn't in use (eg VINTR has no character etc)
  52 */
  53#define __DISABLED_CHAR '\0'
  54
  55/*
  56 * This is the flip buffer used for the tty driver.  The buffer is
  57 * located in the tty structure, and is used as a high speed interface
  58 * between the tty driver and the tty line discipline.
  59 */
  60#define TTY_FLIPBUF_SIZE 512
  61
  62struct tty_buffer {
  63        struct tty_buffer *next;
  64        char *char_buf_ptr;
  65        unsigned char *flag_buf_ptr;
  66        int used;
  67        int size;
  68        int commit;
  69        int read;
  70        /* Data points here */
  71        unsigned long data[0];
  72};
  73
  74struct tty_bufhead {
  75        struct delayed_work work;
  76        struct semaphore pty_sem;
  77        spinlock_t lock;
  78        struct tty_buffer *head;        /* Queue head */
  79        struct tty_buffer *tail;        /* Active buffer */
  80        struct tty_buffer *free;        /* Free queue head */
  81        int memory_used;                /* Buffer space used excluding free queue */
  82};
  83/*
  84 * When a break, frame error, or parity error happens, these codes are
  85 * stuffed into the flags buffer.
  86 */
  87#define TTY_NORMAL      0
  88#define TTY_BREAK       1
  89#define TTY_FRAME       2
  90#define TTY_PARITY      3
  91#define TTY_OVERRUN     4
  92
  93#define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
  94#define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
  95#define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
  96#define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
  97#define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
  98#define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
  99#define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
 100#define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
 101#define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
 102#define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
 103#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
 104#define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
 105#define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
 106#define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
 107#define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
 108#define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
 109#define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
 110
 111#define _I_FLAG(tty,f)  ((tty)->termios->c_iflag & (f))
 112#define _O_FLAG(tty,f)  ((tty)->termios->c_oflag & (f))
 113#define _C_FLAG(tty,f)  ((tty)->termios->c_cflag & (f))
 114#define _L_FLAG(tty,f)  ((tty)->termios->c_lflag & (f))
 115
 116#define I_IGNBRK(tty)   _I_FLAG((tty),IGNBRK)
 117#define I_BRKINT(tty)   _I_FLAG((tty),BRKINT)
 118#define I_IGNPAR(tty)   _I_FLAG((tty),IGNPAR)
 119#define I_PARMRK(tty)   _I_FLAG((tty),PARMRK)
 120#define I_INPCK(tty)    _I_FLAG((tty),INPCK)
 121#define I_ISTRIP(tty)   _I_FLAG((tty),ISTRIP)
 122#define I_INLCR(tty)    _I_FLAG((tty),INLCR)
 123#define I_IGNCR(tty)    _I_FLAG((tty),IGNCR)
 124#define I_ICRNL(tty)    _I_FLAG((tty),ICRNL)
 125#define I_IUCLC(tty)    _I_FLAG((tty),IUCLC)
 126#define I_IXON(tty)     _I_FLAG((tty),IXON)
 127#define I_IXANY(tty)    _I_FLAG((tty),IXANY)
 128#define I_IXOFF(tty)    _I_FLAG((tty),IXOFF)
 129#define I_IMAXBEL(tty)  _I_FLAG((tty),IMAXBEL)
 130#define I_IUTF8(tty)    _I_FLAG((tty),IUTF8)
 131
 132#define O_OPOST(tty)    _O_FLAG((tty),OPOST)
 133#define O_OLCUC(tty)    _O_FLAG((tty),OLCUC)
 134#define O_ONLCR(tty)    _O_FLAG((tty),ONLCR)
 135#define O_OCRNL(tty)    _O_FLAG((tty),OCRNL)
 136#define O_ONOCR(tty)    _O_FLAG((tty),ONOCR)
 137#define O_ONLRET(tty)   _O_FLAG((tty),ONLRET)
 138#define O_OFILL(tty)    _O_FLAG((tty),OFILL)
 139#define O_OFDEL(tty)    _O_FLAG((tty),OFDEL)
 140#define O_NLDLY(tty)    _O_FLAG((tty),NLDLY)
 141#define O_CRDLY(tty)    _O_FLAG((tty),CRDLY)
 142#define O_TABDLY(tty)   _O_FLAG((tty),TABDLY)
 143#define O_BSDLY(tty)    _O_FLAG((tty),BSDLY)
 144#define O_VTDLY(tty)    _O_FLAG((tty),VTDLY)
 145#define O_FFDLY(tty)    _O_FLAG((tty),FFDLY)
 146
 147#define C_BAUD(tty)     _C_FLAG((tty),CBAUD)
 148#define C_CSIZE(tty)    _C_FLAG((tty),CSIZE)
 149#define C_CSTOPB(tty)   _C_FLAG((tty),CSTOPB)
 150#define C_CREAD(tty)    _C_FLAG((tty),CREAD)
 151#define C_PARENB(tty)   _C_FLAG((tty),PARENB)
 152#define C_PARODD(tty)   _C_FLAG((tty),PARODD)
 153#define C_HUPCL(tty)    _C_FLAG((tty),HUPCL)
 154#define C_CLOCAL(tty)   _C_FLAG((tty),CLOCAL)
 155#define C_CIBAUD(tty)   _C_FLAG((tty),CIBAUD)
 156#define C_CRTSCTS(tty)  _C_FLAG((tty),CRTSCTS)
 157
 158#define L_ISIG(tty)     _L_FLAG((tty),ISIG)
 159#define L_ICANON(tty)   _L_FLAG((tty),ICANON)
 160#define L_XCASE(tty)    _L_FLAG((tty),XCASE)
 161#define L_ECHO(tty)     _L_FLAG((tty),ECHO)
 162#define L_ECHOE(tty)    _L_FLAG((tty),ECHOE)
 163#define L_ECHOK(tty)    _L_FLAG((tty),ECHOK)
 164#define L_ECHONL(tty)   _L_FLAG((tty),ECHONL)
 165#define L_NOFLSH(tty)   _L_FLAG((tty),NOFLSH)
 166#define L_TOSTOP(tty)   _L_FLAG((tty),TOSTOP)
 167#define L_ECHOCTL(tty)  _L_FLAG((tty),ECHOCTL)
 168#define L_ECHOPRT(tty)  _L_FLAG((tty),ECHOPRT)
 169#define L_ECHOKE(tty)   _L_FLAG((tty),ECHOKE)
 170#define L_FLUSHO(tty)   _L_FLAG((tty),FLUSHO)
 171#define L_PENDIN(tty)   _L_FLAG((tty),PENDIN)
 172#define L_IEXTEN(tty)   _L_FLAG((tty),IEXTEN)
 173
 174struct device;
 175struct signal_struct;
 176/*
 177 * Where all of the state associated with a tty is kept while the tty
 178 * is open.  Since the termios state should be kept even if the tty
 179 * has been closed --- for things like the baud rate, etc --- it is
 180 * not stored here, but rather a pointer to the real state is stored
 181 * here.  Possible the winsize structure should have the same
 182 * treatment, but (1) the default 80x24 is usually right and (2) it's
 183 * most often used by a windowing system, which will set the correct
 184 * size each time the window is created or resized anyway.
 185 *                                              - TYT, 9/14/92
 186 */
 187struct tty_struct {
 188        int     magic;
 189        struct tty_driver *driver;
 190        int index;
 191        struct tty_ldisc ldisc;
 192        struct mutex termios_mutex;
 193        struct ktermios *termios, *termios_locked;
 194        char name[64];
 195        struct pid *pgrp;
 196        struct pid *session;
 197        unsigned long flags;
 198        int count;
 199        struct winsize winsize;
 200        unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
 201        unsigned char low_latency:1, warned:1;
 202        unsigned char ctrl_status;
 203        unsigned int receive_room;      /* Bytes free for queue */
 204
 205        struct tty_struct *link;
 206        struct fasync_struct *fasync;
 207        struct tty_bufhead buf;
 208        int alt_speed;          /* For magic substitution of 38400 bps */
 209        wait_queue_head_t write_wait;
 210        wait_queue_head_t read_wait;
 211        struct work_struct hangup_work;
 212        void *disc_data;
 213        void *driver_data;
 214        struct list_head tty_files;
 215
 216#define N_TTY_BUF_SIZE 4096
 217        
 218        /*
 219         * The following is data for the N_TTY line discipline.  For
 220         * historical reasons, this is included in the tty structure.
 221         */
 222        unsigned int column;
 223        unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
 224        unsigned char closing:1;
 225        unsigned short minimum_to_wake;
 226        unsigned long overrun_time;
 227        int num_overrun;
 228        unsigned long process_char_map[256/(8*sizeof(unsigned long))];
 229        char *read_buf;
 230        int read_head;
 231        int read_tail;
 232        int read_cnt;
 233        unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
 234        int canon_data;
 235        unsigned long canon_head;
 236        unsigned int canon_column;
 237        struct mutex atomic_read_lock;
 238        struct mutex atomic_write_lock;
 239        unsigned char *write_buf;
 240        int write_cnt;
 241        spinlock_t read_lock;
 242        /* If the tty has a pending do_SAK, queue it here - akpm */
 243        struct work_struct SAK_work;
 244};
 245
 246/* tty magic number */
 247#define TTY_MAGIC               0x5401
 248
 249/*
 250 * These bits are used in the flags field of the tty structure.
 251 * 
 252 * So that interrupts won't be able to mess up the queues,
 253 * copy_to_cooked must be atomic with respect to itself, as must
 254 * tty->write.  Thus, you must use the inline functions set_bit() and
 255 * clear_bit() to make things atomic.
 256 */
 257#define TTY_THROTTLED           0       /* Call unthrottle() at threshold min */
 258#define TTY_IO_ERROR            1       /* Canse an I/O error (may be no ldisc too) */
 259#define TTY_OTHER_CLOSED        2       /* Other side (if any) has closed */
 260#define TTY_EXCLUSIVE           3       /* Exclusive open mode */
 261#define TTY_DEBUG               4       /* Debugging */
 262#define TTY_DO_WRITE_WAKEUP     5       /* Call write_wakeup after queuing new */
 263#define TTY_PUSH                6       /* n_tty private */
 264#define TTY_CLOSING             7       /* ->close() in progress */
 265#define TTY_LDISC               9       /* Line discipline attached */
 266#define TTY_HW_COOK_OUT         14      /* Hardware can do output cooking */
 267#define TTY_HW_COOK_IN          15      /* Hardware can do input cooking */
 268#define TTY_PTY_LOCK            16      /* pty private */
 269#define TTY_NO_WRITE_SPLIT      17      /* Preserve write boundaries to driver */
 270#define TTY_HUPPED              18      /* Post driver->hangup() */
 271#define TTY_FLUSHING            19      /* Flushing to ldisc in progress */
 272#define TTY_FLUSHPENDING        20      /* Queued buffer flush pending */
 273
 274#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
 275
 276extern void tty_write_flush(struct tty_struct *);
 277
 278extern struct ktermios tty_std_termios;
 279
 280extern int kmsg_redirect;
 281
 282extern void console_init(void);
 283extern int vcs_init(void);
 284
 285extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
 286                              const char *routine);
 287extern char *tty_name(struct tty_struct *tty, char *buf);
 288extern void tty_wait_until_sent(struct tty_struct * tty, long timeout);
 289extern int tty_check_change(struct tty_struct * tty);
 290extern void stop_tty(struct tty_struct * tty);
 291extern void start_tty(struct tty_struct * tty);
 292extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc);
 293extern int tty_unregister_ldisc(int disc);
 294extern int tty_register_driver(struct tty_driver *driver);
 295extern int tty_unregister_driver(struct tty_driver *driver);
 296extern struct device *tty_register_device(struct tty_driver *driver,
 297                                          unsigned index, struct device *dev);
 298extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
 299extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
 300                             int buflen);
 301extern void tty_write_message(struct tty_struct *tty, char *msg);
 302
 303extern int is_current_pgrp_orphaned(void);
 304extern int is_ignored(int sig);
 305extern int tty_signal(int sig, struct tty_struct *tty);
 306extern void tty_hangup(struct tty_struct * tty);
 307extern void tty_vhangup(struct tty_struct * tty);
 308extern void tty_unhangup(struct file *filp);
 309extern int tty_hung_up_p(struct file * filp);
 310extern int is_tty(struct file *filp);
 311extern void do_SAK(struct tty_struct *tty);
 312extern void __do_SAK(struct tty_struct *tty);
 313extern void disassociate_ctty(int priv);
 314extern void no_tty(void);
 315extern void tty_flip_buffer_push(struct tty_struct *tty);
 316extern speed_t tty_get_baud_rate(struct tty_struct *tty);
 317extern speed_t tty_termios_baud_rate(struct ktermios *termios);
 318extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
 319extern void tty_termios_encode_baud_rate(struct ktermios *termios, speed_t ibaud, speed_t obaud);
 320extern void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud);
 321extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
 322extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
 323
 324extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
 325extern void tty_ldisc_deref(struct tty_ldisc *);
 326extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
 327
 328extern struct tty_ldisc *tty_ldisc_get(int);
 329extern void tty_ldisc_put(int);
 330
 331extern void tty_wakeup(struct tty_struct *tty);
 332extern void tty_ldisc_flush(struct tty_struct *tty);
 333
 334extern int tty_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 335                     unsigned long arg);
 336extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
 337                        unsigned int cmd, unsigned long arg);
 338extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
 339extern dev_t tty_devnum(struct tty_struct *tty);
 340extern void proc_clear_tty(struct task_struct *p);
 341extern struct tty_struct *get_current_tty(void);
 342
 343extern struct mutex tty_mutex;
 344
 345extern void tty_write_unlock(struct tty_struct *tty);
 346extern 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 */
 352extern struct tty_ldisc tty_ldisc_N_TTY;
 353
 354/* tty_audit.c */
 355#ifdef CONFIG_AUDIT
 356extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
 357                               size_t size);
 358extern void tty_audit_exit(void);
 359extern void tty_audit_fork(struct signal_struct *sig);
 360extern void tty_audit_push(struct tty_struct *tty);
 361extern void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid);
 362extern void tty_audit_opening(void);
 363#else
 364static inline void tty_audit_add_data(struct tty_struct *tty,
 365                                      unsigned char *data, size_t size)
 366{
 367}
 368static inline void tty_audit_exit(void)
 369{
 370}
 371static inline void tty_audit_fork(struct signal_struct *sig)
 372{
 373}
 374static inline void tty_audit_push(struct tty_struct *tty)
 375{
 376}
 377static inline void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid)
 378{
 379}
 380static inline void tty_audit_opening(void)
 381{
 382}
 383#endif
 384
 385/* tty_ioctl.c */
 386extern int n_tty_ioctl(struct tty_struct * tty, struct file * file,
 387                       unsigned int cmd, unsigned long arg);
 388
 389/* serial.c */
 390
 391extern void serial_console_init(void);
 392 
 393/* pcxx.c */
 394
 395extern int pcxe_open(struct tty_struct *tty, struct file *filp);
 396
 397/* printk.c */
 398
 399extern void console_print(const char *);
 400
 401/* vt.c */
 402
 403extern int vt_ioctl(struct tty_struct *tty, struct file * file,
 404                    unsigned int cmd, unsigned long arg);
 405
 406#endif /* __KERNEL__ */
 407#endif
 408