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