sys/kern/tty_pty.c

   1 /*
   2  * Copyright (c) 1982, 1986, 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)tty_pty.c   8.4 (Berkeley) 2/20/95
  34  * $FreeBSD: src/sys/kern/tty_pty.c,v 1.74.2.4 2002/02/20 19:58:13 dillon Exp $
  35  * $DragonFly: src/sys/kern/tty_pty.c,v 1.21 2008/08/13 10:29:38 swildner Exp $
  36  */
  37
  38 /*
  39  * Pseudo-teletype Driver
  40  * (Actually two drivers, requiring two dev_ops structures)
  41  */
  42 #include "use_pty.h"            /* XXX */
  43 #include "opt_compat.h"
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
  48 #include <sys/ioctl_compat.h>
  49 #endif
  50 #include <sys/proc.h>
  51 #include <sys/priv.h>
  52 #include <sys/tty.h>
  53 #include <sys/conf.h>
  54 #include <sys/fcntl.h>
  55 #include <sys/poll.h>
  56 #include <sys/kernel.h>
  57 #include <sys/vnode.h>
  58 #include <sys/signalvar.h>
  59 #include <sys/malloc.h>
  60 #include <sys/device.h>
  61 #include <sys/thread2.h>
  62
  63 MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
  64
  65 static void ptsstart (struct tty *tp);
  66 static void ptsstop (struct tty *tp, int rw);
  67 static void ptcwakeup (struct tty *tp, int flag);
  68 static void ptyinit (int n);
  69
  70 static  d_open_t        ptsopen;
  71 static  d_close_t       ptsclose;
  72 static  d_read_t        ptsread;
  73 static  d_write_t       ptswrite;
  74 static  d_ioctl_t       ptyioctl;
  75 static  d_open_t        ptcopen;
  76 static  d_close_t       ptcclose;
  77 static  d_read_t        ptcread;
  78 static  d_write_t       ptcwrite;
  79 static  d_poll_t        ptcpoll;
  80
  81 #define CDEV_MAJOR_S    5
  82 static struct dev_ops pts_ops = {
  83         { "pts", CDEV_MAJOR_S, D_TTY | D_KQFILTER },
  84         .d_open =       ptsopen,
  85         .d_close =      ptsclose,
  86         .d_read =       ptsread,
  87         .d_write =      ptswrite,
  88         .d_ioctl =      ptyioctl,
  89         .d_poll =       ttypoll,
  90         .d_kqfilter =   ttykqfilter,
  91         .d_revoke =     ttyrevoke
  92 };
  93
  94 #define CDEV_MAJOR_C    6
  95 static struct dev_ops ptc_ops = {
  96         { "ptc", CDEV_MAJOR_C, D_TTY | D_KQFILTER | D_MASTER },
  97         .d_open =       ptcopen,
  98         .d_close =      ptcclose,
  99         .d_read =       ptcread,
 100         .d_write =      ptcwrite,
 101         .d_ioctl =      ptyioctl,
 102         .d_poll =       ptcpoll,
 103         .d_kqfilter =   ttykqfilter,
 104         .d_revoke =     ttyrevoke
 105 };
 106
 107 #define BUFSIZ 100              /* Chunk size iomoved to/from user */
 108
 109 struct  pt_ioctl {
 110         int     pt_flags;
 111         struct  selinfo pt_selr, pt_selw;
 112         u_char  pt_send;
 113         u_char  pt_ucntl;
 114         struct tty pt_tty;
 115         cdev_t  devs, devc;
 116         struct  prison *pt_prison;
 117 };
 118
 119 #define PF_PKT          0x08            /* packet mode */
 120 #define PF_STOPPED      0x10            /* user told stopped */
 121 #define PF_REMOTE       0x20            /* remote and flow controlled input */
 122 #define PF_NOSTOP       0x40
 123 #define PF_UCNTL        0x80            /* user control mode */
 124
 125 /*
 126  * This function creates and initializes a pts/ptc pair
 127  *
 128  * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
 129  * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
 130  *
 131  * XXX: define and add mapping of upper minor bits to allow more
 132  *      than 256 ptys.
 133  */
 134 static void
 135 ptyinit(int n)
 136 {
 137         cdev_t devs, devc;
 138         char *names = "pqrsPQRS";
 139         struct pt_ioctl *pt;
 140
 141         /* For now we only map the lower 8 bits of the minor */
 142         if (n & ~0xff)
 143                 return;
 144
 145         pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
 146         pt->devs = devs = make_dev(&pts_ops, n,
 147             0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
 148         pt->devc = devc = make_dev(&ptc_ops, n,
 149             0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
 150
 151         devs->si_drv1 = devc->si_drv1 = pt;
 152         devs->si_tty = devc->si_tty = &pt->pt_tty;
 153         pt->pt_tty.t_dev = devs;
 154         ttyregister(&pt->pt_tty);
 155 }
 156
 157 /*ARGSUSED*/
 158 static  int
 159 ptsopen(struct dev_open_args *ap)
 160 {
 161         cdev_t dev = ap->a_head.a_dev;
 162         struct tty *tp;
 163         int error;
 164 #if 0
 165         int minr;
 166         cdev_t nextdev;
 167 #endif
 168         struct pt_ioctl *pti;
 169
 170 #if 0
 171         minr = lminor(dev);
 172         /*
 173          * REMOVED gross hack for devfs.  also note that makedev()
 174          * no longer exists in this form and reference counting makes
 175          * this a problem if we don't clean it out later.
 176          */
 177         if (minr < 255) {
 178                 nextdev = make_sub_dev(dev, minr + 1);
 179                 if (!nextdev->si_drv1) {
 180                         ptyinit(minr + 1);
 181                 }
 182         }
 183 #endif
 184         if (!dev->si_drv1)
 185                 ptyinit(minor(dev));
 186         if (!dev->si_drv1)
 187                 return(ENXIO);
 188         pti = dev->si_drv1;
 189         tp = dev->si_tty;
 190         if ((tp->t_state & TS_ISOPEN) == 0) {
 191                 ttychars(tp);           /* Set up default chars */
 192                 tp->t_iflag = TTYDEF_IFLAG;
 193                 tp->t_oflag = TTYDEF_OFLAG;
 194                 tp->t_lflag = TTYDEF_LFLAG;
 195                 tp->t_cflag = TTYDEF_CFLAG;
 196                 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
 197         } else if ((tp->t_state & TS_XCLUDE) && priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) {
 198                 return (EBUSY);
 199         } else if (pti->pt_prison != ap->a_cred->cr_prison) {
 200                 return (EBUSY);
 201         }
 202         if (tp->t_oproc)                        /* Ctrlr still around. */
 203                 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
 204         while ((tp->t_state & TS_CARR_ON) == 0) {
 205                 if (ap->a_oflags & FNONBLOCK)
 206                         break;
 207                 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0);
 208                 if (error)
 209                         return (error);
 210         }
 211         error = (*linesw[tp->t_line].l_open)(dev, tp);
 212         if (error == 0)
 213                 ptcwakeup(tp, FREAD|FWRITE);
 214         return (error);
 215 }
 216
 217 static  int
 218 ptsclose(struct dev_close_args *ap)
 219 {
 220         cdev_t dev = ap->a_head.a_dev;
 221         struct tty *tp;
 222         int err;
 223
 224         tp = dev->si_tty;
 225         err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
 226         ptsstop(tp, FREAD|FWRITE);
 227         (void) ttyclose(tp);
 228         return (err);
 229 }
 230
 231 static  int
 232 ptsread(struct dev_read_args *ap)
 233 {
 234         cdev_t dev = ap->a_head.a_dev;
 235         struct proc *p = curproc;
 236         struct tty *tp = dev->si_tty;
 237         struct pt_ioctl *pti = dev->si_drv1;
 238         struct lwp *lp;
 239
 240         int error = 0;
 241
 242         lp = curthread->td_lwp;
 243
 244 again:
 245         if (pti->pt_flags & PF_REMOTE) {
 246                 while (isbackground(p, tp)) {
 247                         if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
 248                             SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
 249                             p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT)
 250                                 return (EIO);
 251                         pgsignal(p->p_pgrp, SIGTTIN, 1);
 252                         error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
 253                         if (error)
 254                                 return (error);
 255                 }
 256                 if (tp->t_canq.c_cc == 0) {
 257                         if (ap->a_ioflag & IO_NDELAY)
 258                                 return (EWOULDBLOCK);
 259                         error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
 260                                          "ptsin", 0);
 261                         if (error)
 262                                 return (error);
 263                         goto again;
 264                 }
 265                 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0)
 266                         if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) {
 267                                 error = EFAULT;
 268                                 break;
 269                         }
 270                 if (tp->t_canq.c_cc == 1)
 271                         clist_getc(&tp->t_canq);
 272                 if (tp->t_canq.c_cc)
 273                         return (error);
 274         } else
 275                 if (tp->t_oproc)
 276                         error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
 277         ptcwakeup(tp, FWRITE);
 278         return (error);
 279 }
 280
 281 /*
 282  * Write to pseudo-tty.
 283  * Wakeups of controlling tty will happen
 284  * indirectly, when tty driver calls ptsstart.
 285  */
 286 static  int
 287 ptswrite(struct dev_write_args *ap)
 288 {
 289         cdev_t dev = ap->a_head.a_dev;
 290         struct tty *tp;
 291
 292         tp = dev->si_tty;
 293         if (tp->t_oproc == 0)
 294                 return (EIO);
 295         return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
 296 }
 297
 298 /*
 299  * Start output on pseudo-tty.
 300  * Wake up process selecting or sleeping for input from controlling tty.
 301  */
 302 static void
 303 ptsstart(struct tty *tp)
 304 {
 305         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 306
 307         if (tp->t_state & TS_TTSTOP)
 308                 return;
 309         if (pti->pt_flags & PF_STOPPED) {
 310                 pti->pt_flags &= ~PF_STOPPED;
 311                 pti->pt_send = TIOCPKT_START;
 312         }
 313         ptcwakeup(tp, FREAD);
 314 }
 315
 316 static void
 317 ptcwakeup(struct tty *tp, int flag)
 318 {
 319         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 320
 321         if (flag & FREAD) {
 322                 selwakeup(&pti->pt_selr);
 323                 wakeup(TSA_PTC_READ(tp));
 324         }
 325         if (flag & FWRITE) {
 326                 selwakeup(&pti->pt_selw);
 327                 wakeup(TSA_PTC_WRITE(tp));
 328         }
 329 }
 330
 331 static  int
 332 ptcopen(struct dev_open_args *ap)
 333 {
 334         cdev_t dev = ap->a_head.a_dev;
 335         struct tty *tp;
 336         struct pt_ioctl *pti;
 337
 338         if (!dev->si_drv1)
 339                 ptyinit(minor(dev));
 340         if (!dev->si_drv1)
 341                 return(ENXIO);
 342         tp = dev->si_tty;
 343         if (tp->t_oproc)
 344                 return (EIO);
 345         tp->t_oproc = ptsstart;
 346         tp->t_stop = ptsstop;
 347         (void)(*linesw[tp->t_line].l_modem)(tp, 1);
 348         tp->t_lflag &= ~EXTPROC;
 349         pti = dev->si_drv1;
 350         pti->pt_prison = ap->a_cred->cr_prison;
 351         pti->pt_flags = 0;
 352         pti->pt_send = 0;
 353         pti->pt_ucntl = 0;
 354         pti->devs->si_uid = ap->a_cred->cr_uid;
 355         return (0);
 356 }
 357
 358 static  int
 359 ptcclose(struct dev_close_args *ap)
 360 {
 361         cdev_t dev = ap->a_head.a_dev;
 362         struct tty *tp;
 363
 364         tp = dev->si_tty;
 365         (void)(*linesw[tp->t_line].l_modem)(tp, 0);
 366
 367         /*
 368          * XXX MDMBUF makes no sense for ptys but would inhibit the above
 369          * l_modem().  CLOCAL makes sense but isn't supported.   Special
 370          * l_modem()s that ignore carrier drop make no sense for ptys but
 371          * may be in use because other parts of the line discipline make
 372          * sense for ptys.  Recover by doing everything that a normal
 373          * ttymodem() would have done except for sending a SIGHUP.
 374          */
 375         if (tp->t_state & TS_ISOPEN) {
 376                 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
 377                 tp->t_state |= TS_ZOMBIE;
 378                 ttyflush(tp, FREAD | FWRITE);
 379                 tp->t_dev->si_uid = 0;
 380         }
 381
 382         tp->t_oproc = 0;                /* mark closed */
 383         return (0);
 384 }
 385
 386 static  int
 387 ptcread(struct dev_read_args *ap)
 388 {
 389         cdev_t dev = ap->a_head.a_dev;
 390         struct tty *tp = dev->si_tty;
 391         struct pt_ioctl *pti = dev->si_drv1;
 392         char buf[BUFSIZ];
 393         int error = 0, cc;
 394
 395         /*
 396          * We want to block until the slave
 397          * is open, and there's something to read;
 398          * but if we lost the slave or we're NBIO,
 399          * then return the appropriate error instead.
 400          */
 401         for (;;) {
 402                 if (tp->t_state&TS_ISOPEN) {
 403                         if (pti->pt_flags&PF_PKT && pti->pt_send) {
 404                                 error = ureadc((int)pti->pt_send, ap->a_uio);
 405                                 if (error)
 406                                         return (error);
 407                                 if (pti->pt_send & TIOCPKT_IOCTL) {
 408                                         cc = min(ap->a_uio->uio_resid,
 409                                                 sizeof(tp->t_termios));
 410                                         uiomove((caddr_t)&tp->t_termios, cc,
 411                                                 ap->a_uio);
 412                                 }
 413                                 pti->pt_send = 0;
 414                                 return (0);
 415                         }
 416                         if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
 417                                 error = ureadc((int)pti->pt_ucntl, ap->a_uio);
 418                                 if (error)
 419                                         return (error);
 420                                 pti->pt_ucntl = 0;
 421                                 return (0);
 422                         }
 423                         if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
 424                                 break;
 425                 }
 426                 if ((tp->t_state & TS_CONNECTED) == 0)
 427                         return (0);     /* EOF */
 428                 if (ap->a_ioflag & IO_NDELAY)
 429                         return (EWOULDBLOCK);
 430                 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
 431                 if (error)
 432                         return (error);
 433         }
 434         if (pti->pt_flags & (PF_PKT|PF_UCNTL))
 435                 error = ureadc(0, ap->a_uio);
 436         while (ap->a_uio->uio_resid > 0 && error == 0) {
 437                 cc = q_to_b(&tp->t_outq, buf, min(ap->a_uio->uio_resid, BUFSIZ));
 438                 if (cc <= 0)
 439                         break;
 440                 error = uiomove(buf, cc, ap->a_uio);
 441         }
 442         ttwwakeup(tp);
 443         return (error);
 444 }
 445
 446 static  void
 447 ptsstop(struct tty *tp, int flush)
 448 {
 449         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 450         int flag;
 451
 452         /* note: FLUSHREAD and FLUSHWRITE already ok */
 453         if (flush == 0) {
 454                 flush = TIOCPKT_STOP;
 455                 pti->pt_flags |= PF_STOPPED;
 456         } else
 457                 pti->pt_flags &= ~PF_STOPPED;
 458         pti->pt_send |= flush;
 459         /* change of perspective */
 460         flag = 0;
 461         if (flush & FREAD)
 462                 flag |= FWRITE;
 463         if (flush & FWRITE)
 464                 flag |= FREAD;
 465         ptcwakeup(tp, flag);
 466 }
 467
 468 static  int
 469 ptcpoll(struct dev_poll_args *ap)
 470 {
 471         cdev_t dev = ap->a_head.a_dev;
 472         struct tty *tp = dev->si_tty;
 473         struct pt_ioctl *pti = dev->si_drv1;
 474         int revents = 0;
 475
 476         if ((tp->t_state & TS_CONNECTED) == 0) {
 477                 ap->a_events = seltrue(dev, ap->a_events) | POLLHUP;
 478                 return(0);
 479         }
 480
 481         /*
 482          * Need to block timeouts (ttrstart).
 483          */
 484         crit_enter();
 485
 486         if (ap->a_events & (POLLIN | POLLRDNORM))
 487                 if ((tp->t_state & TS_ISOPEN) &&
 488                     ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
 489                      ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
 490                      ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
 491                         revents |= ap->a_events & (POLLIN | POLLRDNORM);
 492
 493         if (ap->a_events & (POLLOUT | POLLWRNORM))
 494                 if (tp->t_state & TS_ISOPEN &&
 495                     ((pti->pt_flags & PF_REMOTE) ?
 496                      (tp->t_canq.c_cc == 0) :
 497                      ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
 498                       (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
 499                         revents |= ap->a_events & (POLLOUT | POLLWRNORM);
 500
 501         if (ap->a_events & POLLHUP)
 502                 if ((tp->t_state & TS_CARR_ON) == 0)
 503                         revents |= POLLHUP;
 504
 505         if (revents == 0) {
 506                 if (ap->a_events & (POLLIN | POLLRDNORM))
 507                         selrecord(curthread, &pti->pt_selr);
 508
 509                 if (ap->a_events & (POLLOUT | POLLWRNORM))
 510                         selrecord(curthread, &pti->pt_selw);
 511         }
 512         crit_exit();
 513
 514         ap->a_events = revents;
 515         return (0);
 516 }
 517
 518 static  int
 519 ptcwrite(struct dev_write_args *ap)
 520 {
 521         cdev_t dev = ap->a_head.a_dev;
 522         struct tty *tp = dev->si_tty;
 523         u_char *cp = 0;
 524         int cc = 0;
 525         u_char locbuf[BUFSIZ];
 526         int cnt = 0;
 527         struct pt_ioctl *pti = dev->si_drv1;
 528         int error = 0;
 529
 530 again:
 531         if ((tp->t_state&TS_ISOPEN) == 0)
 532                 goto block;
 533         if (pti->pt_flags & PF_REMOTE) {
 534                 if (tp->t_canq.c_cc)
 535                         goto block;
 536                 while ((ap->a_uio->uio_resid > 0 || cc > 0) &&
 537                        tp->t_canq.c_cc < TTYHOG - 1) {
 538                         if (cc == 0) {
 539                                 cc = min(ap->a_uio->uio_resid, BUFSIZ);
 540                                 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
 541                                 cp = locbuf;
 542                                 error = uiomove((caddr_t)cp, cc, ap->a_uio);
 543                                 if (error)
 544                                         return (error);
 545                                 /* check again for safety */
 546                                 if ((tp->t_state & TS_ISOPEN) == 0) {
 547                                         /* adjust as usual */
 548                                         ap->a_uio->uio_resid += cc;
 549                                         return (EIO);
 550                                 }
 551                         }
 552                         if (cc > 0) {
 553                                 cc = b_to_q((char *)cp, cc, &tp->t_canq);
 554                                 /*
 555                                  * XXX we don't guarantee that the canq size
 556                                  * is >= TTYHOG, so the above b_to_q() may
 557                                  * leave some bytes uncopied.  However, space
 558                                  * is guaranteed for the null terminator if
 559                                  * we don't fail here since (TTYHOG - 1) is
 560                                  * not a multiple of CBSIZE.
 561                                  */
 562                                 if (cc > 0)
 563                                         break;
 564                         }
 565                 }
 566                 /* adjust for data copied in but not written */
 567                 ap->a_uio->uio_resid += cc;
 568                 clist_putc(0, &tp->t_canq);
 569                 ttwakeup(tp);
 570                 wakeup(TSA_PTS_READ(tp));
 571                 return (0);
 572         }
 573         while (ap->a_uio->uio_resid > 0 || cc > 0) {
 574                 if (cc == 0) {
 575                         cc = min(ap->a_uio->uio_resid, BUFSIZ);
 576                         cp = locbuf;
 577                         error = uiomove((caddr_t)cp, cc, ap->a_uio);
 578                         if (error)
 579                                 return (error);
 580                         /* check again for safety */
 581                         if ((tp->t_state & TS_ISOPEN) == 0) {
 582                                 /* adjust for data copied in but not written */
 583                                 ap->a_uio->uio_resid += cc;
 584                                 return (EIO);
 585                         }
 586                 }
 587                 while (cc > 0) {
 588                         if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
 589                            (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
 590                                 wakeup(TSA_HUP_OR_INPUT(tp));
 591                                 goto block;
 592                         }
 593                         (*linesw[tp->t_line].l_rint)(*cp++, tp);
 594                         cnt++;
 595                         cc--;
 596                 }
 597                 cc = 0;
 598         }
 599         return (0);
 600 block:
 601         /*
 602          * Come here to wait for slave to open, for space
 603          * in outq, or space in rawq, or an empty canq.
 604          */
 605         if ((tp->t_state & TS_CONNECTED) == 0) {
 606                 /* adjust for data copied in but not written */
 607                 ap->a_uio->uio_resid += cc;
 608                 return (EIO);
 609         }
 610         if (ap->a_ioflag & IO_NDELAY) {
 611                 /* adjust for data copied in but not written */
 612                 ap->a_uio->uio_resid += cc;
 613                 if (cnt == 0)
 614                         return (EWOULDBLOCK);
 615                 return (0);
 616         }
 617         error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
 618         if (error) {
 619                 /* adjust for data copied in but not written */
 620                 ap->a_uio->uio_resid += cc;
 621                 return (error);
 622         }
 623         goto again;
 624 }
 625
 626 /*ARGSUSED*/
 627 static  int
 628 ptyioctl(struct dev_ioctl_args *ap)
 629 {
 630         cdev_t dev = ap->a_head.a_dev;
 631         struct tty *tp = dev->si_tty;
 632         struct pt_ioctl *pti = dev->si_drv1;
 633         u_char *cc = tp->t_cc;
 634         int stop, error;
 635
 636         if (dev_dflags(dev) & D_MASTER) {
 637                 switch (ap->a_cmd) {
 638
 639                 case TIOCGPGRP:
 640                         /*
 641                          * We avoid calling ttioctl on the controller since,
 642                          * in that case, tp must be the controlling terminal.
 643                          */
 644                         *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
 645                         return (0);
 646
 647                 case TIOCPKT:
 648                         if (*(int *)ap->a_data) {
 649                                 if (pti->pt_flags & PF_UCNTL)
 650                                         return (EINVAL);
 651                                 pti->pt_flags |= PF_PKT;
 652                         } else
 653                                 pti->pt_flags &= ~PF_PKT;
 654                         return (0);
 655
 656                 case TIOCUCNTL:
 657                         if (*(int *)ap->a_data) {
 658                                 if (pti->pt_flags & PF_PKT)
 659                                         return (EINVAL);
 660                                 pti->pt_flags |= PF_UCNTL;
 661                         } else
 662                                 pti->pt_flags &= ~PF_UCNTL;
 663                         return (0);
 664
 665                 case TIOCREMOTE:
 666                         if (*(int *)ap->a_data)
 667                                 pti->pt_flags |= PF_REMOTE;
 668                         else
 669                                 pti->pt_flags &= ~PF_REMOTE;
 670                         ttyflush(tp, FREAD|FWRITE);
 671                         return (0);
 672                 }
 673
 674                 /*
 675                  * The rest of the ioctls shouldn't be called until
 676                  * the slave is open.
 677                  */
 678                 if ((tp->t_state & TS_ISOPEN) == 0)
 679                         return (EAGAIN);
 680
 681                 switch (ap->a_cmd) {
 682 #ifdef COMPAT_43
 683                 case TIOCSETP:
 684                 case TIOCSETN:
 685 #endif
 686                 case TIOCSETD:
 687                 case TIOCSETA:
 688                 case TIOCSETAW:
 689                 case TIOCSETAF:
 690                         /*
 691                          * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
 692                          * ttywflush(tp) will hang if there are characters in
 693                          * the outq.
 694                          */
 695                         ndflush(&tp->t_outq, tp->t_outq.c_cc);
 696                         break;
 697
 698                 case TIOCSIG:
 699                         if (*(unsigned int *)ap->a_data >= NSIG ||
 700                             *(unsigned int *)ap->a_data == 0)
 701                                 return(EINVAL);
 702                         if ((tp->t_lflag&NOFLSH) == 0)
 703                                 ttyflush(tp, FREAD|FWRITE);
 704                         pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1);
 705                         if ((*(unsigned int *)ap->a_data == SIGINFO) &&
 706                             ((tp->t_lflag&NOKERNINFO) == 0))
 707                                 ttyinfo(tp);
 708                         return(0);
 709                 }
 710         }
 711         if (ap->a_cmd == TIOCEXT) {
 712                 /*
 713                  * When the EXTPROC bit is being toggled, we need
 714                  * to send an TIOCPKT_IOCTL if the packet driver
 715                  * is turned on.
 716                  */
 717                 if (*(int *)ap->a_data) {
 718                         if (pti->pt_flags & PF_PKT) {
 719                                 pti->pt_send |= TIOCPKT_IOCTL;
 720                                 ptcwakeup(tp, FREAD);
 721                         }
 722                         tp->t_lflag |= EXTPROC;
 723                 } else {
 724                         if ((tp->t_lflag & EXTPROC) &&
 725                             (pti->pt_flags & PF_PKT)) {
 726                                 pti->pt_send |= TIOCPKT_IOCTL;
 727                                 ptcwakeup(tp, FREAD);
 728                         }
 729                         tp->t_lflag &= ~EXTPROC;
 730                 }
 731                 return(0);
 732         }
 733         error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
 734                                               ap->a_fflag, ap->a_cred);
 735         if (error == ENOIOCTL)
 736                  error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
 737         if (error == ENOIOCTL) {
 738                 if (pti->pt_flags & PF_UCNTL &&
 739                     (ap->a_cmd & ~0xff) == UIOCCMD(0)) {
 740                         if (ap->a_cmd & 0xff) {
 741                                 pti->pt_ucntl = (u_char)ap->a_cmd;
 742                                 ptcwakeup(tp, FREAD);
 743                         }
 744                         return (0);
 745                 }
 746                 error = ENOTTY;
 747         }
 748         /*
 749          * If external processing and packet mode send ioctl packet.
 750          */
 751         if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
 752                 switch(ap->a_cmd) {
 753                 case TIOCSETA:
 754                 case TIOCSETAW:
 755                 case TIOCSETAF:
 756 #ifdef COMPAT_43
 757                 case TIOCSETP:
 758                 case TIOCSETN:
 759 #endif
 760 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
 761                 case TIOCSETC:
 762                 case TIOCSLTC:
 763                 case TIOCLBIS:
 764                 case TIOCLBIC:
 765                 case TIOCLSET:
 766 #endif
 767                         pti->pt_send |= TIOCPKT_IOCTL;
 768                         ptcwakeup(tp, FREAD);
 769                 default:
 770                         break;
 771                 }
 772         }
 773         stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
 774                 && CCEQ(cc[VSTART], CTRL('q'));
 775         if (pti->pt_flags & PF_NOSTOP) {
 776                 if (stop) {
 777                         pti->pt_send &= ~TIOCPKT_NOSTOP;
 778                         pti->pt_send |= TIOCPKT_DOSTOP;
 779                         pti->pt_flags &= ~PF_NOSTOP;
 780                         ptcwakeup(tp, FREAD);
 781                 }
 782         } else {
 783                 if (!stop) {
 784                         pti->pt_send &= ~TIOCPKT_DOSTOP;
 785                         pti->pt_send |= TIOCPKT_NOSTOP;
 786                         pti->pt_flags |= PF_NOSTOP;
 787                         ptcwakeup(tp, FREAD);
 788                 }
 789         }
 790         return (error);
 791 }
 792
 793
 794 static void ptc_drvinit (void *unused);
 795
 796 static void
 797 ptc_drvinit(void *unused)
 798 {
 799         dev_ops_add(&pts_ops, 0, 0);
 800         dev_ops_add(&ptc_ops, 0, 0);
 801         /* XXX: Gross hack for DEVFS */
 802         /* XXX: DEVFS is no more, should this be removed? */
 803         ptyinit(0);
 804 }
 805
 806 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)