FreeBSD/Linux Kernel Cross Reference
sys/sys/tty.h

     /*-
      * Copyright (c) 1982, 1986, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
      * the permission of UNIX System Laboratories, Inc.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)tty.h       8.6 (Berkeley) 1/21/94
     * $FreeBSD$
     */
    
    #ifndef _SYS_TTY_H_
    #define _SYS_TTY_H_
    
    #include <sys/termios.h>
    #include <sys/select.h>         /* For struct selinfo. */
    
    /*
     * Clists are character lists, which is a variable length linked list
     * of cblocks, with a count of the number of characters in the list.
     */
    struct clist {
            int     c_cc;           /* Number of characters in the clist. */
            int     c_cbcount;      /* Number of cblocks. */
            int     c_cbmax;        /* Max # cblocks allowed for this clist. */
            int     c_cbreserved;   /* # cblocks reserved for this clist. */
            char    *c_cf;          /* Pointer to the first cblock. */
            char    *c_cl;          /* Pointer to the last cblock. */
    };
    
    /*
     * Per-tty structure.
     *
     * Should be split in two, into device and tty drivers.
     * Glue could be masks of what to echo and circular buffer
     * (low, high, timeout).
     */
    struct tty {
            struct  clist t_rawq;           /* Device raw input queue. */
            long    t_rawcc;                /* Raw input queue statistics. */
            struct  clist t_canq;           /* Device canonical queue. */
            long    t_cancc;                /* Canonical queue statistics. */
            struct  clist t_outq;           /* Device output queue. */
            long    t_outcc;                /* Output queue statistics. */
            int     t_line;                 /* Interface to device drivers. */
            dev_t   t_dev;                  /* Device. */
            int     t_state;                /* Device and driver (TS*) state. */
            int     t_flags;                /* Tty flags. */
            int     t_timeout;              /* Timeout for ttywait() */
            struct  pgrp *t_pgrp;           /* Foreground process group. */
            struct  session *t_session;     /* Enclosing session. */
            struct  sigio *t_sigio;         /* Information for async I/O. */
            struct  selinfo t_rsel;         /* Tty read/oob select. */
            struct  selinfo t_wsel;         /* Tty write select. */
            struct  termios t_termios;      /* Termios state. */
            struct  winsize t_winsize;      /* Window size. */
                                            /* Start output. */
            void    (*t_oproc) __P((struct tty *));
                                            /* Stop output. */
            void    (*t_stop) __P((struct tty *, int));
                                            /* Set hardware state. */
            int     (*t_param) __P((struct tty *, struct termios *));
            void    *t_sc;                  /* XXX: net/if_sl.c:sl_softc. */
            int     t_column;               /* Tty output column. */
            int     t_rocount, t_rocol;     /* Tty. */
            int     t_ififosize;            /* Total size of upstream fifos. */
            int     t_ihiwat;               /* High water mark for input. */
            int     t_ilowat;               /* Low water mark for input. */
            speed_t t_ispeedwat;            /* t_ispeed override for watermarks. */
           int     t_ohiwat;               /* High water mark for output. */
           int     t_olowat;               /* Low water mark for output. */
           speed_t t_ospeedwat;            /* t_ospeed override for watermarks. */
           int     t_gen;                  /* Generation number. */
   };
   
   #define t_cc            t_termios.c_cc
   #define t_cflag         t_termios.c_cflag
   #define t_iflag         t_termios.c_iflag
   #define t_ispeed        t_termios.c_ispeed
   #define t_lflag         t_termios.c_lflag
   #define t_min           t_termios.c_min
   #define t_oflag         t_termios.c_oflag
   #define t_ospeed        t_termios.c_ospeed
   #define t_time          t_termios.c_time
   
   #define TTIPRI  25                      /* Sleep priority for tty reads. */
   #define TTOPRI  26                      /* Sleep priority for tty writes. */
   
   /*
    * User data unfortunately has to be copied through buffers on the way to
    * and from clists.  The buffers are on the stack so their sizes must be
    * fairly small.
    */
   #define IBUFSIZ 384                     /* Should be >= max value of MIN. */
   #define OBUFSIZ 100
   
   #ifndef TTYHOG
   #define TTYHOG  1024
   #endif
   
   #ifdef KERNEL
   #define TTMAXHIWAT      roundup(2048, CBSIZE)
   #define TTMINHIWAT      roundup(100, CBSIZE)
   #define TTMAXLOWAT      256
   #define TTMINLOWAT      32
   #endif
   
   /* These flags are kept in t_state. */
   #define TS_SO_OLOWAT    0x00001         /* Wake up when output <= low water. */
   #define TS_ASYNC        0x00002         /* Tty in async I/O mode. */
   #define TS_BUSY         0x00004         /* Draining output. */
   #define TS_CARR_ON      0x00008         /* Carrier is present. */
   #define TS_FLUSH        0x00010         /* Outq has been flushed during DMA. */
   #define TS_ISOPEN       0x00020         /* Open has completed. */
   #define TS_TBLOCK       0x00040         /* Further input blocked. */
   #define TS_TIMEOUT      0x00080         /* Wait for output char processing. */
   #define TS_TTSTOP       0x00100         /* Output paused. */
   #ifdef notyet
   #define TS_WOPEN        0x00200         /* Open in progress. */
   #endif
   #define TS_XCLUDE       0x00400         /* Tty requires exclusivity. */
   
   /* State for intra-line fancy editing work. */
   #define TS_BKSL         0x00800         /* State for lowercase \ work. */
   #define TS_CNTTB        0x01000         /* Counting tab width, ignore FLUSHO. */
   #define TS_ERASE        0x02000         /* Within a \.../ for PRTRUB. */
   #define TS_LNCH         0x04000         /* Next character is literal. */
   #define TS_TYPEN        0x08000         /* Retyping suspended input (PENDIN). */
   #define TS_LOCAL        (TS_BKSL | TS_CNTTB | TS_ERASE | TS_LNCH | TS_TYPEN)
   
   /* Extras. */
   #define TS_CAN_BYPASS_L_RINT 0x010000   /* Device in "raw" mode. */
   #define TS_CONNECTED    0x020000        /* Connection open. */
   #define TS_SNOOP        0x040000        /* Device is being snooped on. */
   #define TS_SO_OCOMPLETE 0x080000        /* Wake up when output completes. */
   #define TS_ZOMBIE       0x100000        /* Connection lost. */
   
   /* Hardware flow-control-invoked bits. */
   #define TS_CAR_OFLOW    0x200000        /* For MDMBUF (XXX handle in driver). */
   #ifdef notyet
   #define TS_CTS_OFLOW    0x400000        /* For CCTS_OFLOW. */
   #define TS_DSR_OFLOW    0x800000        /* For CDSR_OFLOW. */
   #endif
   
   /* Character type information. */
   #define ORDINARY        0
   #define CONTROL         1
   #define BACKSPACE       2
   #define NEWLINE         3
   #define TAB             4
   #define VTAB            5
   #define RETURN          6
   
   struct speedtab {
           int sp_speed;                   /* Speed. */
           int sp_code;                    /* Code. */
   };
   
   /* Modem control commands (driver). */
   #define DMSET           0
   #define DMBIS           1
   #define DMBIC           2
   #define DMGET           3
   
   /* Flags on a character passed to ttyinput. */
   #define TTY_CHARMASK    0x000000ff      /* Character mask */
   #define TTY_QUOTE       0x00000100      /* Character quoted */
   #define TTY_ERRORMASK   0xff000000      /* Error mask */
   #define TTY_FE          0x01000000      /* Framing error */
   #define TTY_PE          0x02000000      /* Parity error */
   #define TTY_OE          0x04000000      /* Overrun error */
   #define TTY_BI          0x08000000      /* Break condition */
   
   /* Is tp controlling terminal for p? */
   #define isctty(p, tp)                                                   \
           ((p)->p_session == (tp)->t_session && (p)->p_flag & P_CONTROLT)
   
   /* Is p in background of tp? */
   #define isbackground(p, tp)                                             \
           (isctty((p), (tp)) && (p)->p_pgrp != (tp)->t_pgrp)
   
   /* Unique sleep addresses. */
   #define TSA_CARR_ON(tp)         ((void *)&(tp)->t_rawq)
   #define TSA_HUP_OR_INPUT(tp)    ((void *)&(tp)->t_rawq.c_cf)
   #define TSA_OCOMPLETE(tp)       ((void *)&(tp)->t_outq.c_cl)
   #define TSA_OLOWAT(tp)          ((void *)&(tp)->t_outq)
   #define TSA_PTC_READ(tp)        ((void *)&(tp)->t_outq.c_cf)
   #define TSA_PTC_WRITE(tp)       ((void *)&(tp)->t_rawq.c_cl)
   #define TSA_PTS_READ(tp)        ((void *)&(tp)->t_canq)
   
   #ifdef KERNEL
   #ifdef MALLOC_DECLARE
   MALLOC_DECLARE(M_TTYS);
   #endif
   extern  struct tty *constty;    /* Temporary virtual console. */
   
   int      b_to_q __P((char *cp, int cc, struct clist *q));
   void     catq __P((struct clist *from, struct clist *to));
   void     clist_alloc_cblocks __P((struct clist *q, int ccmax, int ccres));
   void     clist_free_cblocks __P((struct clist *q));
   /* void  clist_init __P((void)); */ /* defined in systm.h for main() */
   int      getc __P((struct clist *q));
   void     ndflush __P((struct clist *q, int cc));
   int      ndqb __P((struct clist *q, int flag));
   char    *nextc __P((struct clist *q, char *cp, int *c));
   int      putc __P((int c, struct clist *q));
   int      q_to_b __P((struct clist *q, char *cp, int cc));
   int      unputc __P((struct clist *q));
   
   int     ttcompat __P((struct tty *tp, u_long com, caddr_t data, int flag));
   int     ttsetcompat __P((struct tty *tp, u_long *com, caddr_t data, struct termios *term));
   
   void     termioschars __P((struct termios *t));
   int      tputchar __P((int c, struct tty *tp));
   int      ttioctl __P((struct tty *tp, u_long com, void *data, int flag));
   int      ttread __P((struct tty *tp, struct uio *uio, int flag));
   void     ttrstrt __P((void *tp));
   int      ttypoll __P((struct tty *tp, int events, struct proc *p));
   int      ttpoll __P((dev_t dev, int events, struct proc *p));
   void     ttsetwater __P((struct tty *tp));
   int      ttspeedtab __P((int speed, struct speedtab *table));
   int      ttstart __P((struct tty *tp));
   void     ttwakeup __P((struct tty *tp));
   int      ttwrite __P((struct tty *tp, struct uio *uio, int flag));
   void     ttwwakeup __P((struct tty *tp));
   void     ttyblock __P((struct tty *tp));
   void     ttychars __P((struct tty *tp));
   int      ttycheckoutq __P((struct tty *tp, int wait));
   int      ttyclose __P((struct tty *tp));
   void     ttyflush __P((struct tty *tp, int rw));
   void     ttyinfo __P((struct tty *tp));
   int      ttyinput __P((int c, struct tty *tp));
   int      ttylclose __P((struct tty *tp, int flag));
   int      ttymodem __P((struct tty *tp, int flag));
   int      ttyopen __P((dev_t device, struct tty *tp));
   int      ttysleep __P((struct tty *tp,
               void *chan, int pri, char *wmesg, int timeout));
   int      ttywait __P((struct tty *tp));
   struct tty *ttymalloc __P((void));
   void     ttyfree __P((struct tty *));
   
   #endif /* KERNEL */
   
   #endif /* !_SYS_TTY_H_ */

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