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

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    1 /*-
    2  * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Portions of this software were developed under sponsorship from Snow
    6  * B.V., the Netherlands.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: stable/9/sys/sys/tty.h 242892 2012-11-11 12:12:44Z ed $
   30  */
   31 
   32 #ifndef _SYS_TTY_H_
   33 #define _SYS_TTY_H_
   34 
   35 #include <sys/param.h>
   36 #include <sys/queue.h>
   37 #include <sys/lock.h>
   38 #include <sys/mutex.h>
   39 #include <sys/condvar.h>
   40 #include <sys/selinfo.h>
   41 #include <sys/_termios.h>
   42 #include <sys/ttycom.h>
   43 #include <sys/ttyqueue.h>
   44 
   45 struct cdev;
   46 struct file;
   47 struct pgrp;
   48 struct session;
   49 struct ucred;
   50 
   51 struct ttydevsw;
   52 
   53 /*
   54  * Per-TTY structure, containing buffers, etc.
   55  *
   56  * List of locks
   57  * (t)  locked by t_mtx
   58  * (l)  locked by tty_list_sx
   59  * (c)  const until freeing
   60  */
   61 struct tty {
   62         struct mtx      *t_mtx;         /* TTY lock. */
   63         struct mtx      t_mtxobj;       /* Per-TTY lock (when not borrowing). */
   64         TAILQ_ENTRY(tty) t_list;        /* (l) TTY list entry. */
   65         unsigned int    t_flags;        /* (t) Terminal option flags. */
   66 /* Keep flags in sync with db_show_tty and pstat(8). */
   67 #define TF_NOPREFIX     0x00001 /* Don't prepend "tty" to device name. */
   68 #define TF_INITLOCK     0x00002 /* Create init/lock state devices. */
   69 #define TF_CALLOUT      0x00004 /* Create "cua" devices. */
   70 #define TF_OPENED_IN    0x00008 /* "tty" node is in use. */
   71 #define TF_OPENED_OUT   0x00010 /* "cua" node is in use. */
   72 #define TF_OPENED_CONS  0x00020 /* Device in use as console. */
   73 #define TF_OPENED       (TF_OPENED_IN|TF_OPENED_OUT|TF_OPENED_CONS)
   74 #define TF_GONE         0x00040 /* Device node is gone. */
   75 #define TF_OPENCLOSE    0x00080 /* Device is in open()/close(). */
   76 #define TF_ASYNC        0x00100 /* Asynchronous I/O enabled. */
   77 #define TF_LITERAL      0x00200 /* Accept the next character literally. */
   78 #define TF_HIWAT_IN     0x00400 /* We've reached the input watermark. */
   79 #define TF_HIWAT_OUT    0x00800 /* We've reached the output watermark. */
   80 #define TF_HIWAT        (TF_HIWAT_IN|TF_HIWAT_OUT)
   81 #define TF_STOPPED      0x01000 /* Output flow control - stopped. */
   82 #define TF_EXCLUDE      0x02000 /* Exclusive access. */
   83 #define TF_BYPASS       0x04000 /* Optimized input path. */
   84 #define TF_ZOMBIE       0x08000 /* Modem disconnect received. */
   85 #define TF_HOOK         0x10000 /* TTY has hook attached. */
   86 #define TF_BUSY_IN      0x20000 /* Process busy in read() -- not supported. */
   87 #define TF_BUSY_OUT     0x40000 /* Process busy in write(). */
   88 #define TF_BUSY         (TF_BUSY_IN|TF_BUSY_OUT)
   89         unsigned int    t_revokecnt;    /* (t) revoke() count. */
   90 
   91         /* Buffering mechanisms. */
   92         struct ttyinq   t_inq;          /* (t) Input queue. */
   93         size_t          t_inlow;        /* (t) Input low watermark. */
   94         struct ttyoutq  t_outq;         /* (t) Output queue. */
   95         size_t          t_outlow;       /* (t) Output low watermark. */
   96 
   97         /* Sleeping mechanisms. */
   98         struct cv       t_inwait;       /* (t) Input wait queue. */
   99         struct cv       t_outwait;      /* (t) Output wait queue. */
  100         struct cv       t_outserwait;   /* (t) Serial output wait queue. */
  101         struct cv       t_bgwait;       /* (t) Background wait queue. */
  102         struct cv       t_dcdwait;      /* (t) Carrier Detect wait queue. */
  103 
  104         /* Polling mechanisms. */
  105         struct selinfo  t_inpoll;       /* (t) Input poll queue. */
  106         struct selinfo  t_outpoll;      /* (t) Output poll queue. */
  107         struct sigio    *t_sigio;       /* (t) Asynchronous I/O. */
  108 
  109         struct termios  t_termios;      /* (t) I/O processing flags. */
  110         struct winsize  t_winsize;      /* (t) Window size. */
  111         unsigned int    t_column;       /* (t) Current cursor position. */
  112         unsigned int    t_writepos;     /* (t) Where input was interrupted. */
  113         int             t_compatflags;  /* (t) COMPAT_43TTY flags. */
  114 
  115         /* Init/lock-state devices. */
  116         struct termios  t_termios_init_in;      /* tty%s.init. */
  117         struct termios  t_termios_lock_in;      /* tty%s.lock. */
  118         struct termios  t_termios_init_out;     /* cua%s.init. */
  119         struct termios  t_termios_lock_out;     /* cua%s.lock. */
  120 
  121         struct ttydevsw *t_devsw;       /* (c) Driver hooks. */
  122         struct ttyhook  *t_hook;        /* (t) Capture/inject hook. */
  123 
  124         /* Process signal delivery. */
  125         struct pgrp     *t_pgrp;        /* (t) Foreground process group. */
  126         struct session  *t_session;     /* (t) Associated session. */
  127         unsigned int    t_sessioncnt;   /* (t) Backpointing sessions. */
  128 
  129         void            *t_devswsoftc;  /* (c) Soft config, for drivers. */
  130         void            *t_hooksoftc;   /* (t) Soft config, for hooks. */
  131         struct cdev     *t_dev;         /* (c) Primary character device. */
  132 };
  133 
  134 /*
  135  * Userland version of struct tty, for sysctl kern.ttys
  136  */
  137 struct xtty {
  138         size_t  xt_size;        /* Structure size. */
  139         size_t  xt_insize;      /* Input queue size. */
  140         size_t  xt_incc;        /* Canonicalized characters. */
  141         size_t  xt_inlc;        /* Input line charaters. */
  142         size_t  xt_inlow;       /* Input low watermark. */
  143         size_t  xt_outsize;     /* Output queue size. */
  144         size_t  xt_outcc;       /* Output queue usage. */
  145         size_t  xt_outlow;      /* Output low watermark. */
  146         unsigned int xt_column; /* Current column position. */
  147         pid_t   xt_pgid;        /* Foreground process group. */
  148         pid_t   xt_sid;         /* Session. */
  149         unsigned int xt_flags;  /* Terminal option flags. */
  150         dev_t   xt_dev;         /* Userland device. */
  151 };
  152 
  153 #ifdef _KERNEL
  154 
  155 /* Used to distinguish between normal, callout, lock and init devices. */
  156 #define TTYUNIT_INIT            0x1
  157 #define TTYUNIT_LOCK            0x2
  158 #define TTYUNIT_CALLOUT         0x4
  159 
  160 /* Allocation and deallocation. */
  161 struct tty *tty_alloc(struct ttydevsw *tsw, void *softc);
  162 struct tty *tty_alloc_mutex(struct ttydevsw *tsw, void *softc, struct mtx *mtx);
  163 void    tty_rel_pgrp(struct tty *tp, struct pgrp *pgrp);
  164 void    tty_rel_sess(struct tty *tp, struct session *sess);
  165 void    tty_rel_gone(struct tty *tp);
  166 
  167 #define tty_lock(tp)            mtx_lock((tp)->t_mtx)
  168 #define tty_unlock(tp)          mtx_unlock((tp)->t_mtx)
  169 #define tty_lock_assert(tp,ma)  mtx_assert((tp)->t_mtx, (ma))
  170 #define tty_getlock(tp)         ((tp)->t_mtx)
  171 
  172 /* Device node creation. */
  173 void    tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...)
  174     __printflike(3, 4);
  175 #define tty_makealias(tp,fmt,...) \
  176         make_dev_alias((tp)->t_dev, fmt, ## __VA_ARGS__)
  177 
  178 /* Signalling processes. */
  179 void    tty_signal_sessleader(struct tty *tp, int signal);
  180 void    tty_signal_pgrp(struct tty *tp, int signal);
  181 /* Waking up readers/writers. */
  182 int     tty_wait(struct tty *tp, struct cv *cv);
  183 int     tty_wait_background(struct tty *tp, struct thread *td, int sig);
  184 int     tty_timedwait(struct tty *tp, struct cv *cv, int timo);
  185 void    tty_wakeup(struct tty *tp, int flags);
  186 
  187 /* System messages. */
  188 int     tty_checkoutq(struct tty *tp);
  189 int     tty_putchar(struct tty *tp, char c);
  190 
  191 int     tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag,
  192     struct thread *td);
  193 int     tty_ioctl_compat(struct tty *tp, u_long cmd, caddr_t data,
  194     int fflag, struct thread *td);
  195 void    tty_init_console(struct tty *tp, speed_t speed);
  196 void    tty_flush(struct tty *tp, int flags);
  197 void    tty_hiwat_in_block(struct tty *tp);
  198 void    tty_hiwat_in_unblock(struct tty *tp);
  199 dev_t   tty_udev(struct tty *tp);
  200 #define tty_opened(tp)          ((tp)->t_flags & TF_OPENED)
  201 #define tty_gone(tp)            ((tp)->t_flags & TF_GONE)
  202 #define tty_softc(tp)           ((tp)->t_devswsoftc)
  203 #define tty_devname(tp)         devtoname((tp)->t_dev)
  204 
  205 /* Status line printing. */
  206 void    tty_info(struct tty *tp);
  207 
  208 /* /dev/console selection. */
  209 void    ttyconsdev_select(const char *name);
  210 
  211 /* Pseudo-terminal hooks. */
  212 int     pts_alloc(int fflags, struct thread *td, struct file *fp);
  213 int     pts_alloc_external(int fd, struct thread *td, struct file *fp,
  214     struct cdev *dev, const char *name);
  215 
  216 /* Drivers and line disciplines also need to call these. */
  217 #include <sys/ttydisc.h>
  218 #include <sys/ttydevsw.h>
  219 #include <sys/ttyhook.h>
  220 #endif /* _KERNEL */
  221 
  222 #endif /* !_SYS_TTY_H_ */

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