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 1.13 2005/06/06 15:02:28 dillon Exp $
  36  */
  37
  38 /*
  39  * Pseudo-teletype Driver
  40  * (Actually two drivers, requiring two entries in 'cdevsw')
  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/tty.h>
  52 #include <sys/conf.h>
  53 #include <sys/fcntl.h>
  54 #include <sys/poll.h>
  55 #include <sys/kernel.h>
  56 #include <sys/vnode.h>
  57 #include <sys/signalvar.h>
  58 #include <sys/malloc.h>
  59 #include <sys/device.h>
  60 #include <sys/thread2.h>
  61
  62 MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
  63
  64 static void ptsstart (struct tty *tp);
  65 static void ptsstop (struct tty *tp, int rw);
  66 static void ptcwakeup (struct tty *tp, int flag);
  67 static void ptyinit (int n);
  68
  69 static  d_open_t        ptsopen;
  70 static  d_close_t       ptsclose;
  71 static  d_read_t        ptsread;
  72 static  d_write_t       ptswrite;
  73 static  d_ioctl_t       ptyioctl;
  74 static  d_open_t        ptcopen;
  75 static  d_close_t       ptcclose;
  76 static  d_read_t        ptcread;
  77 static  d_write_t       ptcwrite;
  78 static  d_poll_t        ptcpoll;
  79
  80 #define CDEV_MAJOR_S    5
  81 static struct cdevsw pts_cdevsw = {
  82         /* name */      "pts",
  83         /* maj */       CDEV_MAJOR_S,
  84         /* flags */     D_TTY | D_KQFILTER,
  85         /* port */      NULL,
  86         /* clone */     NULL,
  87
  88         /* open */      ptsopen,
  89         /* close */     ptsclose,
  90         /* read */      ptsread,
  91         /* write */     ptswrite,
  92         /* ioctl */     ptyioctl,
  93         /* poll */      ttypoll,
  94         /* mmap */      nommap,
  95         /* strategy */  nostrategy,
  96         /* dump */      nodump,
  97         /* psize */     nopsize,
  98         /* kqfilter */  ttykqfilter
  99 };
 100
 101 #define CDEV_MAJOR_C    6
 102 static struct cdevsw ptc_cdevsw = {
 103         /* name */      "ptc",
 104         /* maj */       CDEV_MAJOR_C,
 105         /* flags */     D_TTY | D_KQFILTER | D_MASTER,
 106         /* port */      NULL,
 107         /* clone */     NULL,
 108
 109         /* open */      ptcopen,
 110         /* close */     ptcclose,
 111         /* read */      ptcread,
 112         /* write */     ptcwrite,
 113         /* ioctl */     ptyioctl,
 114         /* poll */      ptcpoll,
 115         /* mmap */      nommap,
 116         /* strategy */  nostrategy,
 117         /* dump */      nodump,
 118         /* psize */     nopsize,
 119         /* kqfilter */  ttykqfilter
 120 };
 121
 122 #define BUFSIZ 100              /* Chunk size iomoved to/from user */
 123
 124 struct  pt_ioctl {
 125         int     pt_flags;
 126         struct  selinfo pt_selr, pt_selw;
 127         u_char  pt_send;
 128         u_char  pt_ucntl;
 129         struct tty pt_tty;
 130         dev_t   devs, devc;
 131         struct  prison *pt_prison;
 132 };
 133
 134 #define PF_PKT          0x08            /* packet mode */
 135 #define PF_STOPPED      0x10            /* user told stopped */
 136 #define PF_REMOTE       0x20            /* remote and flow controlled input */
 137 #define PF_NOSTOP       0x40
 138 #define PF_UCNTL        0x80            /* user control mode */
 139
 140 /*
 141  * This function creates and initializes a pts/ptc pair
 142  *
 143  * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
 144  * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
 145  *
 146  * XXX: define and add mapping of upper minor bits to allow more
 147  *      than 256 ptys.
 148  */
 149 static void
 150 ptyinit(n)
 151         int n;
 152 {
 153         dev_t devs, devc;
 154         char *names = "pqrsPQRS";
 155         struct pt_ioctl *pt;
 156
 157         /* For now we only map the lower 8 bits of the minor */
 158         if (n & ~0xff)
 159                 return;
 160
 161         pt = malloc(sizeof(*pt), M_PTY, M_WAITOK);
 162         bzero(pt, sizeof(*pt));
 163         pt->devs = devs = make_dev(&pts_cdevsw, n,
 164             0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
 165         pt->devc = devc = make_dev(&ptc_cdevsw, n,
 166             0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
 167
 168         devs->si_drv1 = devc->si_drv1 = pt;
 169         devs->si_tty = devc->si_tty = &pt->pt_tty;
 170         pt->pt_tty.t_dev = devs;
 171         ttyregister(&pt->pt_tty);
 172 }
 173
 174 /*ARGSUSED*/
 175 static  int
 176 ptsopen(dev_t dev, int flag, int devtype, struct thread *td)
 177 {
 178         struct tty *tp;
 179         int error;
 180         int minr;
 181 #if 0
 182         dev_t nextdev;
 183 #endif
 184         struct pt_ioctl *pti;
 185         struct proc *p;
 186
 187         p = td->td_proc;
 188         KKASSERT(p != NULL);
 189
 190         minr = lminor(dev);
 191 #if 0
 192         /*
 193          * REMOVED gross hack for devfs.  also note that makedev()
 194          * no longer exists in this form and reference counting makes
 195          * this a problem if we don't clean it out later.
 196          */
 197         if (minr < 255) {
 198                 nextdev = make_sub_dev(dev, minr + 1);
 199                 if (!nextdev->si_drv1) {
 200                         ptyinit(minr + 1);
 201                 }
 202         }
 203 #endif
 204         if (!dev->si_drv1)
 205                 ptyinit(minor(dev));
 206         if (!dev->si_drv1)
 207                 return(ENXIO);
 208         pti = dev->si_drv1;
 209         tp = dev->si_tty;
 210         if ((tp->t_state & TS_ISOPEN) == 0) {
 211                 ttychars(tp);           /* Set up default chars */
 212                 tp->t_iflag = TTYDEF_IFLAG;
 213                 tp->t_oflag = TTYDEF_OFLAG;
 214                 tp->t_lflag = TTYDEF_LFLAG;
 215                 tp->t_cflag = TTYDEF_CFLAG;
 216                 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
 217         } else if (tp->t_state & TS_XCLUDE && suser(td)) {
 218                 return (EBUSY);
 219         } else if (pti->pt_prison != p->p_ucred->cr_prison) {
 220                 return (EBUSY);
 221         }
 222         if (tp->t_oproc)                        /* Ctrlr still around. */
 223                 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
 224         while ((tp->t_state & TS_CARR_ON) == 0) {
 225                 if (flag&FNONBLOCK)
 226                         break;
 227                 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0);
 228                 if (error)
 229                         return (error);
 230         }
 231         error = (*linesw[tp->t_line].l_open)(dev, tp);
 232         if (error == 0)
 233                 ptcwakeup(tp, FREAD|FWRITE);
 234         return (error);
 235 }
 236
 237 static  int
 238 ptsclose(dev, flag, mode, td)
 239         dev_t dev;
 240         int flag, mode;
 241         struct thread *td;
 242 {
 243         struct tty *tp;
 244         int err;
 245
 246         tp = dev->si_tty;
 247         err = (*linesw[tp->t_line].l_close)(tp, flag);
 248         ptsstop(tp, FREAD|FWRITE);
 249         (void) ttyclose(tp);
 250         return (err);
 251 }
 252
 253 static  int
 254 ptsread(dev, uio, flag)
 255         dev_t dev;
 256         struct uio *uio;
 257         int flag;
 258 {
 259         struct proc *p = curproc;
 260         struct tty *tp = dev->si_tty;
 261         struct pt_ioctl *pti = dev->si_drv1;
 262         int error = 0;
 263
 264 again:
 265         if (pti->pt_flags & PF_REMOTE) {
 266                 while (isbackground(p, tp)) {
 267                         if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
 268                             SIGISMEMBER(p->p_sigmask, SIGTTIN) ||
 269                             p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT)
 270                                 return (EIO);
 271                         pgsignal(p->p_pgrp, SIGTTIN, 1);
 272                         error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
 273                         if (error)
 274                                 return (error);
 275                 }
 276                 if (tp->t_canq.c_cc == 0) {
 277                         if (flag & IO_NDELAY)
 278                                 return (EWOULDBLOCK);
 279                         error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
 280                                          "ptsin", 0);
 281                         if (error)
 282                                 return (error);
 283                         goto again;
 284                 }
 285                 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
 286                         if (ureadc(getc(&tp->t_canq), uio) < 0) {
 287                                 error = EFAULT;
 288                                 break;
 289                         }
 290                 if (tp->t_canq.c_cc == 1)
 291                         (void) getc(&tp->t_canq);
 292                 if (tp->t_canq.c_cc)
 293                         return (error);
 294         } else
 295                 if (tp->t_oproc)
 296                         error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
 297         ptcwakeup(tp, FWRITE);
 298         return (error);
 299 }
 300
 301 /*
 302  * Write to pseudo-tty.
 303  * Wakeups of controlling tty will happen
 304  * indirectly, when tty driver calls ptsstart.
 305  */
 306 static  int
 307 ptswrite(dev, uio, flag)
 308         dev_t dev;
 309         struct uio *uio;
 310         int flag;
 311 {
 312         struct tty *tp;
 313
 314         tp = dev->si_tty;
 315         if (tp->t_oproc == 0)
 316                 return (EIO);
 317         return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
 318 }
 319
 320 /*
 321  * Start output on pseudo-tty.
 322  * Wake up process selecting or sleeping for input from controlling tty.
 323  */
 324 static void
 325 ptsstart(tp)
 326         struct tty *tp;
 327 {
 328         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 329
 330         if (tp->t_state & TS_TTSTOP)
 331                 return;
 332         if (pti->pt_flags & PF_STOPPED) {
 333                 pti->pt_flags &= ~PF_STOPPED;
 334                 pti->pt_send = TIOCPKT_START;
 335         }
 336         ptcwakeup(tp, FREAD);
 337 }
 338
 339 static void
 340 ptcwakeup(tp, flag)
 341         struct tty *tp;
 342         int flag;
 343 {
 344         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 345
 346         if (flag & FREAD) {
 347                 selwakeup(&pti->pt_selr);
 348                 wakeup(TSA_PTC_READ(tp));
 349         }
 350         if (flag & FWRITE) {
 351                 selwakeup(&pti->pt_selw);
 352                 wakeup(TSA_PTC_WRITE(tp));
 353         }
 354 }
 355
 356 static  int
 357 ptcopen(dev, flag, devtype, td)
 358         dev_t dev;
 359         int flag, devtype;
 360         struct thread *td;
 361 {
 362         struct tty *tp;
 363         struct pt_ioctl *pti;
 364
 365         if (!dev->si_drv1)
 366                 ptyinit(minor(dev));
 367         if (!dev->si_drv1)
 368                 return(ENXIO);
 369         tp = dev->si_tty;
 370         if (tp->t_oproc)
 371                 return (EIO);
 372         KKASSERT(td->td_proc != NULL);
 373         tp->t_oproc = ptsstart;
 374         tp->t_stop = ptsstop;
 375         (void)(*linesw[tp->t_line].l_modem)(tp, 1);
 376         tp->t_lflag &= ~EXTPROC;
 377         pti = dev->si_drv1;
 378         pti->pt_prison = td->td_proc->p_ucred->cr_prison;
 379         pti->pt_flags = 0;
 380         pti->pt_send = 0;
 381         pti->pt_ucntl = 0;
 382         return (0);
 383 }
 384
 385 static  int
 386 ptcclose(dev, flags, fmt, td)
 387         dev_t dev;
 388         int flags;
 389         int fmt;
 390         struct thread *td;
 391 {
 392         struct tty *tp;
 393
 394         tp = dev->si_tty;
 395         (void)(*linesw[tp->t_line].l_modem)(tp, 0);
 396
 397         /*
 398          * XXX MDMBUF makes no sense for ptys but would inhibit the above
 399          * l_modem().  CLOCAL makes sense but isn't supported.   Special
 400          * l_modem()s that ignore carrier drop make no sense for ptys but
 401          * may be in use because other parts of the line discipline make
 402          * sense for ptys.  Recover by doing everything that a normal
 403          * ttymodem() would have done except for sending a SIGHUP.
 404          */
 405         if (tp->t_state & TS_ISOPEN) {
 406                 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
 407                 tp->t_state |= TS_ZOMBIE;
 408                 ttyflush(tp, FREAD | FWRITE);
 409         }
 410
 411         tp->t_oproc = 0;                /* mark closed */
 412         return (0);
 413 }
 414
 415 static  int
 416 ptcread(dev, uio, flag)
 417         dev_t dev;
 418         struct uio *uio;
 419         int flag;
 420 {
 421         struct tty *tp = dev->si_tty;
 422         struct pt_ioctl *pti = dev->si_drv1;
 423         char buf[BUFSIZ];
 424         int error = 0, cc;
 425
 426         /*
 427          * We want to block until the slave
 428          * is open, and there's something to read;
 429          * but if we lost the slave or we're NBIO,
 430          * then return the appropriate error instead.
 431          */
 432         for (;;) {
 433                 if (tp->t_state&TS_ISOPEN) {
 434                         if (pti->pt_flags&PF_PKT && pti->pt_send) {
 435                                 error = ureadc((int)pti->pt_send, uio);
 436                                 if (error)
 437                                         return (error);
 438                                 if (pti->pt_send & TIOCPKT_IOCTL) {
 439                                         cc = min(uio->uio_resid,
 440                                                 sizeof(tp->t_termios));
 441                                         uiomove((caddr_t)&tp->t_termios, cc,
 442                                                 uio);
 443                                 }
 444                                 pti->pt_send = 0;
 445                                 return (0);
 446                         }
 447                         if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
 448                                 error = ureadc((int)pti->pt_ucntl, uio);
 449                                 if (error)
 450                                         return (error);
 451                                 pti->pt_ucntl = 0;
 452                                 return (0);
 453                         }
 454                         if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
 455                                 break;
 456                 }
 457                 if ((tp->t_state & TS_CONNECTED) == 0)
 458                         return (0);     /* EOF */
 459                 if (flag & IO_NDELAY)
 460                         return (EWOULDBLOCK);
 461                 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
 462                 if (error)
 463                         return (error);
 464         }
 465         if (pti->pt_flags & (PF_PKT|PF_UCNTL))
 466                 error = ureadc(0, uio);
 467         while (uio->uio_resid > 0 && error == 0) {
 468                 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
 469                 if (cc <= 0)
 470                         break;
 471                 error = uiomove(buf, cc, uio);
 472         }
 473         ttwwakeup(tp);
 474         return (error);
 475 }
 476
 477 static  void
 478 ptsstop(tp, flush)
 479         struct tty *tp;
 480         int flush;
 481 {
 482         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 483         int flag;
 484
 485         /* note: FLUSHREAD and FLUSHWRITE already ok */
 486         if (flush == 0) {
 487                 flush = TIOCPKT_STOP;
 488                 pti->pt_flags |= PF_STOPPED;
 489         } else
 490                 pti->pt_flags &= ~PF_STOPPED;
 491         pti->pt_send |= flush;
 492         /* change of perspective */
 493         flag = 0;
 494         if (flush & FREAD)
 495                 flag |= FWRITE;
 496         if (flush & FWRITE)
 497                 flag |= FREAD;
 498         ptcwakeup(tp, flag);
 499 }
 500
 501 static  int
 502 ptcpoll(dev, events, td)
 503         dev_t dev;
 504         int events;
 505         struct thread *td;
 506 {
 507         struct tty *tp = dev->si_tty;
 508         struct pt_ioctl *pti = dev->si_drv1;
 509         int revents = 0;
 510
 511         if ((tp->t_state & TS_CONNECTED) == 0)
 512                 return (seltrue(dev, events, td) | POLLHUP);
 513
 514         /*
 515          * Need to block timeouts (ttrstart).
 516          */
 517         crit_enter();
 518
 519         if (events & (POLLIN | POLLRDNORM))
 520                 if ((tp->t_state & TS_ISOPEN) &&
 521                     ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
 522                      ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
 523                      ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
 524                         revents |= events & (POLLIN | POLLRDNORM);
 525
 526         if (events & (POLLOUT | POLLWRNORM))
 527                 if (tp->t_state & TS_ISOPEN &&
 528                     ((pti->pt_flags & PF_REMOTE) ?
 529                      (tp->t_canq.c_cc == 0) :
 530                      ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
 531                       (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
 532                         revents |= events & (POLLOUT | POLLWRNORM);
 533
 534         if (events & POLLHUP)
 535                 if ((tp->t_state & TS_CARR_ON) == 0)
 536                         revents |= POLLHUP;
 537
 538         if (revents == 0) {
 539                 if (events & (POLLIN | POLLRDNORM))
 540                         selrecord(td, &pti->pt_selr);
 541
 542                 if (events & (POLLOUT | POLLWRNORM))
 543                         selrecord(td, &pti->pt_selw);
 544         }
 545         crit_exit();
 546
 547         return (revents);
 548 }
 549
 550 static  int
 551 ptcwrite(dev, uio, flag)
 552         dev_t dev;
 553         struct uio *uio;
 554         int flag;
 555 {
 556         struct tty *tp = dev->si_tty;
 557         u_char *cp = 0;
 558         int cc = 0;
 559         u_char locbuf[BUFSIZ];
 560         int cnt = 0;
 561         struct pt_ioctl *pti = dev->si_drv1;
 562         int error = 0;
 563
 564 again:
 565         if ((tp->t_state&TS_ISOPEN) == 0)
 566                 goto block;
 567         if (pti->pt_flags & PF_REMOTE) {
 568                 if (tp->t_canq.c_cc)
 569                         goto block;
 570                 while ((uio->uio_resid > 0 || cc > 0) &&
 571                        tp->t_canq.c_cc < TTYHOG - 1) {
 572                         if (cc == 0) {
 573                                 cc = min(uio->uio_resid, BUFSIZ);
 574                                 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
 575                                 cp = locbuf;
 576                                 error = uiomove((caddr_t)cp, cc, uio);
 577                                 if (error)
 578                                         return (error);
 579                                 /* check again for safety */
 580                                 if ((tp->t_state & TS_ISOPEN) == 0) {
 581                                         /* adjust as usual */
 582                                         uio->uio_resid += cc;
 583                                         return (EIO);
 584                                 }
 585                         }
 586                         if (cc > 0) {
 587                                 cc = b_to_q((char *)cp, cc, &tp->t_canq);
 588                                 /*
 589                                  * XXX we don't guarantee that the canq size
 590                                  * is >= TTYHOG, so the above b_to_q() may
 591                                  * leave some bytes uncopied.  However, space
 592                                  * is guaranteed for the null terminator if
 593                                  * we don't fail here since (TTYHOG - 1) is
 594                                  * not a multiple of CBSIZE.
 595                                  */
 596                                 if (cc > 0)
 597                                         break;
 598                         }
 599                 }
 600                 /* adjust for data copied in but not written */
 601                 uio->uio_resid += cc;
 602                 (void) putc(0, &tp->t_canq);
 603                 ttwakeup(tp);
 604                 wakeup(TSA_PTS_READ(tp));
 605                 return (0);
 606         }
 607         while (uio->uio_resid > 0 || cc > 0) {
 608                 if (cc == 0) {
 609                         cc = min(uio->uio_resid, BUFSIZ);
 610                         cp = locbuf;
 611                         error = uiomove((caddr_t)cp, cc, uio);
 612                         if (error)
 613                                 return (error);
 614                         /* check again for safety */
 615                         if ((tp->t_state & TS_ISOPEN) == 0) {
 616                                 /* adjust for data copied in but not written */
 617                                 uio->uio_resid += cc;
 618                                 return (EIO);
 619                         }
 620                 }
 621                 while (cc > 0) {
 622                         if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
 623                            (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
 624                                 wakeup(TSA_HUP_OR_INPUT(tp));
 625                                 goto block;
 626                         }
 627                         (*linesw[tp->t_line].l_rint)(*cp++, tp);
 628                         cnt++;
 629                         cc--;
 630                 }
 631                 cc = 0;
 632         }
 633         return (0);
 634 block:
 635         /*
 636          * Come here to wait for slave to open, for space
 637          * in outq, or space in rawq, or an empty canq.
 638          */
 639         if ((tp->t_state & TS_CONNECTED) == 0) {
 640                 /* adjust for data copied in but not written */
 641                 uio->uio_resid += cc;
 642                 return (EIO);
 643         }
 644         if (flag & IO_NDELAY) {
 645                 /* adjust for data copied in but not written */
 646                 uio->uio_resid += cc;
 647                 if (cnt == 0)
 648                         return (EWOULDBLOCK);
 649                 return (0);
 650         }
 651         error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
 652         if (error) {
 653                 /* adjust for data copied in but not written */
 654                 uio->uio_resid += cc;
 655                 return (error);
 656         }
 657         goto again;
 658 }
 659
 660 /*ARGSUSED*/
 661 static  int
 662 ptyioctl(dev, cmd, data, flag, td)
 663         dev_t dev;
 664         u_long cmd;
 665         caddr_t data;
 666         int flag;
 667         struct thread *td;
 668 {
 669         struct tty *tp = dev->si_tty;
 670         struct pt_ioctl *pti = dev->si_drv1;
 671         u_char *cc = tp->t_cc;
 672         int stop, error;
 673
 674         if (dev_dflags(dev) & D_MASTER) {
 675                 switch (cmd) {
 676
 677                 case TIOCGPGRP:
 678                         /*
 679                          * We avoid calling ttioctl on the controller since,
 680                          * in that case, tp must be the controlling terminal.
 681                          */
 682                         *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
 683                         return (0);
 684
 685                 case TIOCPKT:
 686                         if (*(int *)data) {
 687                                 if (pti->pt_flags & PF_UCNTL)
 688                                         return (EINVAL);
 689                                 pti->pt_flags |= PF_PKT;
 690                         } else
 691                                 pti->pt_flags &= ~PF_PKT;
 692                         return (0);
 693
 694                 case TIOCUCNTL:
 695                         if (*(int *)data) {
 696                                 if (pti->pt_flags & PF_PKT)
 697                                         return (EINVAL);
 698                                 pti->pt_flags |= PF_UCNTL;
 699                         } else
 700                                 pti->pt_flags &= ~PF_UCNTL;
 701                         return (0);
 702
 703                 case TIOCREMOTE:
 704                         if (*(int *)data)
 705                                 pti->pt_flags |= PF_REMOTE;
 706                         else
 707                                 pti->pt_flags &= ~PF_REMOTE;
 708                         ttyflush(tp, FREAD|FWRITE);
 709                         return (0);
 710                 }
 711
 712                 /*
 713                  * The rest of the ioctls shouldn't be called until
 714                  * the slave is open.
 715                  */
 716                 if ((tp->t_state & TS_ISOPEN) == 0)
 717                         return (EAGAIN);
 718
 719                 switch (cmd) {
 720 #ifdef COMPAT_43
 721                 case TIOCSETP:
 722                 case TIOCSETN:
 723 #endif
 724                 case TIOCSETD:
 725                 case TIOCSETA:
 726                 case TIOCSETAW:
 727                 case TIOCSETAF:
 728                         /*
 729                          * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
 730                          * ttywflush(tp) will hang if there are characters in
 731                          * the outq.
 732                          */
 733                         ndflush(&tp->t_outq, tp->t_outq.c_cc);
 734                         break;
 735
 736                 case TIOCSIG:
 737                         if (*(unsigned int *)data >= NSIG ||
 738                             *(unsigned int *)data == 0)
 739                                 return(EINVAL);
 740                         if ((tp->t_lflag&NOFLSH) == 0)
 741                                 ttyflush(tp, FREAD|FWRITE);
 742                         pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
 743                         if ((*(unsigned int *)data == SIGINFO) &&
 744                             ((tp->t_lflag&NOKERNINFO) == 0))
 745                                 ttyinfo(tp);
 746                         return(0);
 747                 }
 748         }
 749         if (cmd == TIOCEXT) {
 750                 /*
 751                  * When the EXTPROC bit is being toggled, we need
 752                  * to send an TIOCPKT_IOCTL if the packet driver
 753                  * is turned on.
 754                  */
 755                 if (*(int *)data) {
 756                         if (pti->pt_flags & PF_PKT) {
 757                                 pti->pt_send |= TIOCPKT_IOCTL;
 758                                 ptcwakeup(tp, FREAD);
 759                         }
 760                         tp->t_lflag |= EXTPROC;
 761                 } else {
 762                         if ((tp->t_lflag & EXTPROC) &&
 763                             (pti->pt_flags & PF_PKT)) {
 764                                 pti->pt_send |= TIOCPKT_IOCTL;
 765                                 ptcwakeup(tp, FREAD);
 766                         }
 767                         tp->t_lflag &= ~EXTPROC;
 768                 }
 769                 return(0);
 770         }
 771         error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
 772         if (error == ENOIOCTL)
 773                  error = ttioctl(tp, cmd, data, flag);
 774         if (error == ENOIOCTL) {
 775                 if (pti->pt_flags & PF_UCNTL &&
 776                     (cmd & ~0xff) == UIOCCMD(0)) {
 777                         if (cmd & 0xff) {
 778                                 pti->pt_ucntl = (u_char)cmd;
 779                                 ptcwakeup(tp, FREAD);
 780                         }
 781                         return (0);
 782                 }
 783                 error = ENOTTY;
 784         }
 785         /*
 786          * If external processing and packet mode send ioctl packet.
 787          */
 788         if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
 789                 switch(cmd) {
 790                 case TIOCSETA:
 791                 case TIOCSETAW:
 792                 case TIOCSETAF:
 793 #ifdef COMPAT_43
 794                 case TIOCSETP:
 795                 case TIOCSETN:
 796 #endif
 797 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
 798                 case TIOCSETC:
 799                 case TIOCSLTC:
 800                 case TIOCLBIS:
 801                 case TIOCLBIC:
 802                 case TIOCLSET:
 803 #endif
 804                         pti->pt_send |= TIOCPKT_IOCTL;
 805                         ptcwakeup(tp, FREAD);
 806                 default:
 807                         break;
 808                 }
 809         }
 810         stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
 811                 && CCEQ(cc[VSTART], CTRL('q'));
 812         if (pti->pt_flags & PF_NOSTOP) {
 813                 if (stop) {
 814                         pti->pt_send &= ~TIOCPKT_NOSTOP;
 815                         pti->pt_send |= TIOCPKT_DOSTOP;
 816                         pti->pt_flags &= ~PF_NOSTOP;
 817                         ptcwakeup(tp, FREAD);
 818                 }
 819         } else {
 820                 if (!stop) {
 821                         pti->pt_send &= ~TIOCPKT_DOSTOP;
 822                         pti->pt_send |= TIOCPKT_NOSTOP;
 823                         pti->pt_flags |= PF_NOSTOP;
 824                         ptcwakeup(tp, FREAD);
 825                 }
 826         }
 827         return (error);
 828 }
 829
 830
 831 static void ptc_drvinit (void *unused);
 832
 833 static void
 834 ptc_drvinit(unused)
 835         void *unused;
 836 {
 837         cdevsw_add(&pts_cdevsw, 0, 0);
 838         cdevsw_add(&ptc_cdevsw, 0, 0);
 839         /* XXX: Gross hack for DEVFS */
 840         /* XXX: DEVFS is no more, should this be removed? */
 841         ptyinit(0);
 842 }
 843
 844 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)