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 1.20 2008/01/05 14:02:38 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/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 dev_ops pts_ops = {
  82         { "pts", CDEV_MAJOR_S, D_TTY | D_KQFILTER },
  83         .d_open =       ptsopen,
  84         .d_close =      ptsclose,
  85         .d_read =       ptsread,
  86         .d_write =      ptswrite,
  87         .d_ioctl =      ptyioctl,
  88         .d_poll =       ttypoll,
  89         .d_kqfilter =   ttykqfilter
  90 };
  91
  92 #define CDEV_MAJOR_C    6
  93 static struct dev_ops ptc_ops = {
  94         { "ptc", CDEV_MAJOR_C, D_TTY | D_KQFILTER | D_MASTER },
  95         .d_open =       ptcopen,
  96         .d_close =      ptcclose,
  97         .d_read =       ptcread,
  98         .d_write =      ptcwrite,
  99         .d_ioctl =      ptyioctl,
 100         .d_poll =       ptcpoll,
 101         .d_kqfilter =   ttykqfilter
 102 };
 103
 104 #define BUFSIZ 100              /* Chunk size iomoved to/from user */
 105
 106 struct  pt_ioctl {
 107         int     pt_flags;
 108         struct  selinfo pt_selr, pt_selw;
 109         u_char  pt_send;
 110         u_char  pt_ucntl;
 111         struct tty pt_tty;
 112         cdev_t  devs, devc;
 113         struct  prison *pt_prison;
 114 };
 115
 116 #define PF_PKT          0x08            /* packet mode */
 117 #define PF_STOPPED      0x10            /* user told stopped */
 118 #define PF_REMOTE       0x20            /* remote and flow controlled input */
 119 #define PF_NOSTOP       0x40
 120 #define PF_UCNTL        0x80            /* user control mode */
 121
 122 /*
 123  * This function creates and initializes a pts/ptc pair
 124  *
 125  * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
 126  * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
 127  *
 128  * XXX: define and add mapping of upper minor bits to allow more
 129  *      than 256 ptys.
 130  */
 131 static void
 132 ptyinit(int n)
 133 {
 134         cdev_t devs, devc;
 135         char *names = "pqrsPQRS";
 136         struct pt_ioctl *pt;
 137
 138         /* For now we only map the lower 8 bits of the minor */
 139         if (n & ~0xff)
 140                 return;
 141
 142         pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
 143         pt->devs = devs = make_dev(&pts_ops, n,
 144             0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
 145         pt->devc = devc = make_dev(&ptc_ops, n,
 146             0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
 147
 148         devs->si_drv1 = devc->si_drv1 = pt;
 149         devs->si_tty = devc->si_tty = &pt->pt_tty;
 150         pt->pt_tty.t_dev = devs;
 151         ttyregister(&pt->pt_tty);
 152 }
 153
 154 /*ARGSUSED*/
 155 static  int
 156 ptsopen(struct dev_open_args *ap)
 157 {
 158         cdev_t dev = ap->a_head.a_dev;
 159         struct tty *tp;
 160         int error;
 161         int minr;
 162 #if 0
 163         cdev_t nextdev;
 164 #endif
 165         struct pt_ioctl *pti;
 166
 167         minr = lminor(dev);
 168 #if 0
 169         /*
 170          * REMOVED gross hack for devfs.  also note that makedev()
 171          * no longer exists in this form and reference counting makes
 172          * this a problem if we don't clean it out later.
 173          */
 174         if (minr < 255) {
 175                 nextdev = make_sub_dev(dev, minr + 1);
 176                 if (!nextdev->si_drv1) {
 177                         ptyinit(minr + 1);
 178                 }
 179         }
 180 #endif
 181         if (!dev->si_drv1)
 182                 ptyinit(minor(dev));
 183         if (!dev->si_drv1)
 184                 return(ENXIO);
 185         pti = dev->si_drv1;
 186         tp = dev->si_tty;
 187         if ((tp->t_state & TS_ISOPEN) == 0) {
 188                 ttychars(tp);           /* Set up default chars */
 189                 tp->t_iflag = TTYDEF_IFLAG;
 190                 tp->t_oflag = TTYDEF_OFLAG;
 191                 tp->t_lflag = TTYDEF_LFLAG;
 192                 tp->t_cflag = TTYDEF_CFLAG;
 193                 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
 194         } else if ((tp->t_state & TS_XCLUDE) && suser_cred(ap->a_cred, 0)) {
 195                 return (EBUSY);
 196         } else if (pti->pt_prison != ap->a_cred->cr_prison) {
 197                 return (EBUSY);
 198         }
 199         if (tp->t_oproc)                        /* Ctrlr still around. */
 200                 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
 201         while ((tp->t_state & TS_CARR_ON) == 0) {
 202                 if (ap->a_oflags & FNONBLOCK)
 203                         break;
 204                 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0);
 205                 if (error)
 206                         return (error);
 207         }
 208         error = (*linesw[tp->t_line].l_open)(dev, tp);
 209         if (error == 0)
 210                 ptcwakeup(tp, FREAD|FWRITE);
 211         return (error);
 212 }
 213
 214 static  int
 215 ptsclose(struct dev_close_args *ap)
 216 {
 217         cdev_t dev = ap->a_head.a_dev;
 218         struct tty *tp;
 219         int err;
 220
 221         tp = dev->si_tty;
 222         err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
 223         ptsstop(tp, FREAD|FWRITE);
 224         (void) ttyclose(tp);
 225         return (err);
 226 }
 227
 228 static  int
 229 ptsread(struct dev_read_args *ap)
 230 {
 231         cdev_t dev = ap->a_head.a_dev;
 232         struct proc *p = curproc;
 233         struct tty *tp = dev->si_tty;
 234         struct pt_ioctl *pti = dev->si_drv1;
 235         struct lwp *lp;
 236
 237         int error = 0;
 238
 239         lp = curthread->td_lwp;
 240
 241 again:
 242         if (pti->pt_flags & PF_REMOTE) {
 243                 while (isbackground(p, tp)) {
 244                         if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
 245                             SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
 246                             p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT)
 247                                 return (EIO);
 248                         pgsignal(p->p_pgrp, SIGTTIN, 1);
 249                         error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
 250                         if (error)
 251                                 return (error);
 252                 }
 253                 if (tp->t_canq.c_cc == 0) {
 254                         if (ap->a_ioflag & IO_NDELAY)
 255                                 return (EWOULDBLOCK);
 256                         error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
 257                                          "ptsin", 0);
 258                         if (error)
 259                                 return (error);
 260                         goto again;
 261                 }
 262                 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0)
 263                         if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) {
 264                                 error = EFAULT;
 265                                 break;
 266                         }
 267                 if (tp->t_canq.c_cc == 1)
 268                         clist_getc(&tp->t_canq);
 269                 if (tp->t_canq.c_cc)
 270                         return (error);
 271         } else
 272                 if (tp->t_oproc)
 273                         error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
 274         ptcwakeup(tp, FWRITE);
 275         return (error);
 276 }
 277
 278 /*
 279  * Write to pseudo-tty.
 280  * Wakeups of controlling tty will happen
 281  * indirectly, when tty driver calls ptsstart.
 282  */
 283 static  int
 284 ptswrite(struct dev_write_args *ap)
 285 {
 286         cdev_t dev = ap->a_head.a_dev;
 287         struct tty *tp;
 288
 289         tp = dev->si_tty;
 290         if (tp->t_oproc == 0)
 291                 return (EIO);
 292         return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
 293 }
 294
 295 /*
 296  * Start output on pseudo-tty.
 297  * Wake up process selecting or sleeping for input from controlling tty.
 298  */
 299 static void
 300 ptsstart(struct tty *tp)
 301 {
 302         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 303
 304         if (tp->t_state & TS_TTSTOP)
 305                 return;
 306         if (pti->pt_flags & PF_STOPPED) {
 307                 pti->pt_flags &= ~PF_STOPPED;
 308                 pti->pt_send = TIOCPKT_START;
 309         }
 310         ptcwakeup(tp, FREAD);
 311 }
 312
 313 static void
 314 ptcwakeup(struct tty *tp, int flag)
 315 {
 316         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 317
 318         if (flag & FREAD) {
 319                 selwakeup(&pti->pt_selr);
 320                 wakeup(TSA_PTC_READ(tp));
 321         }
 322         if (flag & FWRITE) {
 323                 selwakeup(&pti->pt_selw);
 324                 wakeup(TSA_PTC_WRITE(tp));
 325         }
 326 }
 327
 328 static  int
 329 ptcopen(struct dev_open_args *ap)
 330 {
 331         cdev_t dev = ap->a_head.a_dev;
 332         struct tty *tp;
 333         struct pt_ioctl *pti;
 334
 335         if (!dev->si_drv1)
 336                 ptyinit(minor(dev));
 337         if (!dev->si_drv1)
 338                 return(ENXIO);
 339         tp = dev->si_tty;
 340         if (tp->t_oproc)
 341                 return (EIO);
 342         tp->t_oproc = ptsstart;
 343         tp->t_stop = ptsstop;
 344         (void)(*linesw[tp->t_line].l_modem)(tp, 1);
 345         tp->t_lflag &= ~EXTPROC;
 346         pti = dev->si_drv1;
 347         pti->pt_prison = ap->a_cred->cr_prison;
 348         pti->pt_flags = 0;
 349         pti->pt_send = 0;
 350         pti->pt_ucntl = 0;
 351         return (0);
 352 }
 353
 354 static  int
 355 ptcclose(struct dev_close_args *ap)
 356 {
 357         cdev_t dev = ap->a_head.a_dev;
 358         struct tty *tp;
 359
 360         tp = dev->si_tty;
 361         (void)(*linesw[tp->t_line].l_modem)(tp, 0);
 362
 363         /*
 364          * XXX MDMBUF makes no sense for ptys but would inhibit the above
 365          * l_modem().  CLOCAL makes sense but isn't supported.   Special
 366          * l_modem()s that ignore carrier drop make no sense for ptys but
 367          * may be in use because other parts of the line discipline make
 368          * sense for ptys.  Recover by doing everything that a normal
 369          * ttymodem() would have done except for sending a SIGHUP.
 370          */
 371         if (tp->t_state & TS_ISOPEN) {
 372                 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
 373                 tp->t_state |= TS_ZOMBIE;
 374                 ttyflush(tp, FREAD | FWRITE);
 375         }
 376
 377         tp->t_oproc = 0;                /* mark closed */
 378         return (0);
 379 }
 380
 381 static  int
 382 ptcread(struct dev_read_args *ap)
 383 {
 384         cdev_t dev = ap->a_head.a_dev;
 385         struct tty *tp = dev->si_tty;
 386         struct pt_ioctl *pti = dev->si_drv1;
 387         char buf[BUFSIZ];
 388         int error = 0, cc;
 389
 390         /*
 391          * We want to block until the slave
 392          * is open, and there's something to read;
 393          * but if we lost the slave or we're NBIO,
 394          * then return the appropriate error instead.
 395          */
 396         for (;;) {
 397                 if (tp->t_state&TS_ISOPEN) {
 398                         if (pti->pt_flags&PF_PKT && pti->pt_send) {
 399                                 error = ureadc((int)pti->pt_send, ap->a_uio);
 400                                 if (error)
 401                                         return (error);
 402                                 if (pti->pt_send & TIOCPKT_IOCTL) {
 403                                         cc = min(ap->a_uio->uio_resid,
 404                                                 sizeof(tp->t_termios));
 405                                         uiomove((caddr_t)&tp->t_termios, cc,
 406                                                 ap->a_uio);
 407                                 }
 408                                 pti->pt_send = 0;
 409                                 return (0);
 410                         }
 411                         if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
 412                                 error = ureadc((int)pti->pt_ucntl, ap->a_uio);
 413                                 if (error)
 414                                         return (error);
 415                                 pti->pt_ucntl = 0;
 416                                 return (0);
 417                         }
 418                         if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
 419                                 break;
 420                 }
 421                 if ((tp->t_state & TS_CONNECTED) == 0)
 422                         return (0);     /* EOF */
 423                 if (ap->a_ioflag & IO_NDELAY)
 424                         return (EWOULDBLOCK);
 425                 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
 426                 if (error)
 427                         return (error);
 428         }
 429         if (pti->pt_flags & (PF_PKT|PF_UCNTL))
 430                 error = ureadc(0, ap->a_uio);
 431         while (ap->a_uio->uio_resid > 0 && error == 0) {
 432                 cc = q_to_b(&tp->t_outq, buf, min(ap->a_uio->uio_resid, BUFSIZ));
 433                 if (cc <= 0)
 434                         break;
 435                 error = uiomove(buf, cc, ap->a_uio);
 436         }
 437         ttwwakeup(tp);
 438         return (error);
 439 }
 440
 441 static  void
 442 ptsstop(struct tty *tp, int flush)
 443 {
 444         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 445         int flag;
 446
 447         /* note: FLUSHREAD and FLUSHWRITE already ok */
 448         if (flush == 0) {
 449                 flush = TIOCPKT_STOP;
 450                 pti->pt_flags |= PF_STOPPED;
 451         } else
 452                 pti->pt_flags &= ~PF_STOPPED;
 453         pti->pt_send |= flush;
 454         /* change of perspective */
 455         flag = 0;
 456         if (flush & FREAD)
 457                 flag |= FWRITE;
 458         if (flush & FWRITE)
 459                 flag |= FREAD;
 460         ptcwakeup(tp, flag);
 461 }
 462
 463 static  int
 464 ptcpoll(struct dev_poll_args *ap)
 465 {
 466         cdev_t dev = ap->a_head.a_dev;
 467         struct tty *tp = dev->si_tty;
 468         struct pt_ioctl *pti = dev->si_drv1;
 469         int revents = 0;
 470
 471         if ((tp->t_state & TS_CONNECTED) == 0) {
 472                 ap->a_events = seltrue(dev, ap->a_events) | POLLHUP;
 473                 return(0);
 474         }
 475
 476         /*
 477          * Need to block timeouts (ttrstart).
 478          */
 479         crit_enter();
 480
 481         if (ap->a_events & (POLLIN | POLLRDNORM))
 482                 if ((tp->t_state & TS_ISOPEN) &&
 483                     ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
 484                      ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
 485                      ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
 486                         revents |= ap->a_events & (POLLIN | POLLRDNORM);
 487
 488         if (ap->a_events & (POLLOUT | POLLWRNORM))
 489                 if (tp->t_state & TS_ISOPEN &&
 490                     ((pti->pt_flags & PF_REMOTE) ?
 491                      (tp->t_canq.c_cc == 0) :
 492                      ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
 493                       (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
 494                         revents |= ap->a_events & (POLLOUT | POLLWRNORM);
 495
 496         if (ap->a_events & POLLHUP)
 497                 if ((tp->t_state & TS_CARR_ON) == 0)
 498                         revents |= POLLHUP;
 499
 500         if (revents == 0) {
 501                 if (ap->a_events & (POLLIN | POLLRDNORM))
 502                         selrecord(curthread, &pti->pt_selr);
 503
 504                 if (ap->a_events & (POLLOUT | POLLWRNORM))
 505                         selrecord(curthread, &pti->pt_selw);
 506         }
 507         crit_exit();
 508
 509         ap->a_events = revents;
 510         return (0);
 511 }
 512
 513 static  int
 514 ptcwrite(struct dev_write_args *ap)
 515 {
 516         cdev_t dev = ap->a_head.a_dev;
 517         struct tty *tp = dev->si_tty;
 518         u_char *cp = 0;
 519         int cc = 0;
 520         u_char locbuf[BUFSIZ];
 521         int cnt = 0;
 522         struct pt_ioctl *pti = dev->si_drv1;
 523         int error = 0;
 524
 525 again:
 526         if ((tp->t_state&TS_ISOPEN) == 0)
 527                 goto block;
 528         if (pti->pt_flags & PF_REMOTE) {
 529                 if (tp->t_canq.c_cc)
 530                         goto block;
 531                 while ((ap->a_uio->uio_resid > 0 || cc > 0) &&
 532                        tp->t_canq.c_cc < TTYHOG - 1) {
 533                         if (cc == 0) {
 534                                 cc = min(ap->a_uio->uio_resid, BUFSIZ);
 535                                 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
 536                                 cp = locbuf;
 537                                 error = uiomove((caddr_t)cp, cc, ap->a_uio);
 538                                 if (error)
 539                                         return (error);
 540                                 /* check again for safety */
 541                                 if ((tp->t_state & TS_ISOPEN) == 0) {
 542                                         /* adjust as usual */
 543                                         ap->a_uio->uio_resid += cc;
 544                                         return (EIO);
 545                                 }
 546                         }
 547                         if (cc > 0) {
 548                                 cc = b_to_q((char *)cp, cc, &tp->t_canq);
 549                                 /*
 550                                  * XXX we don't guarantee that the canq size
 551                                  * is >= TTYHOG, so the above b_to_q() may
 552                                  * leave some bytes uncopied.  However, space
 553                                  * is guaranteed for the null terminator if
 554                                  * we don't fail here since (TTYHOG - 1) is
 555                                  * not a multiple of CBSIZE.
 556                                  */
 557                                 if (cc > 0)
 558                                         break;
 559                         }
 560                 }
 561                 /* adjust for data copied in but not written */
 562                 ap->a_uio->uio_resid += cc;
 563                 clist_putc(0, &tp->t_canq);
 564                 ttwakeup(tp);
 565                 wakeup(TSA_PTS_READ(tp));
 566                 return (0);
 567         }
 568         while (ap->a_uio->uio_resid > 0 || cc > 0) {
 569                 if (cc == 0) {
 570                         cc = min(ap->a_uio->uio_resid, BUFSIZ);
 571                         cp = locbuf;
 572                         error = uiomove((caddr_t)cp, cc, ap->a_uio);
 573                         if (error)
 574                                 return (error);
 575                         /* check again for safety */
 576                         if ((tp->t_state & TS_ISOPEN) == 0) {
 577                                 /* adjust for data copied in but not written */
 578                                 ap->a_uio->uio_resid += cc;
 579                                 return (EIO);
 580                         }
 581                 }
 582                 while (cc > 0) {
 583                         if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
 584                            (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
 585                                 wakeup(TSA_HUP_OR_INPUT(tp));
 586                                 goto block;
 587                         }
 588                         (*linesw[tp->t_line].l_rint)(*cp++, tp);
 589                         cnt++;
 590                         cc--;
 591                 }
 592                 cc = 0;
 593         }
 594         return (0);
 595 block:
 596         /*
 597          * Come here to wait for slave to open, for space
 598          * in outq, or space in rawq, or an empty canq.
 599          */
 600         if ((tp->t_state & TS_CONNECTED) == 0) {
 601                 /* adjust for data copied in but not written */
 602                 ap->a_uio->uio_resid += cc;
 603                 return (EIO);
 604         }
 605         if (ap->a_ioflag & IO_NDELAY) {
 606                 /* adjust for data copied in but not written */
 607                 ap->a_uio->uio_resid += cc;
 608                 if (cnt == 0)
 609                         return (EWOULDBLOCK);
 610                 return (0);
 611         }
 612         error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
 613         if (error) {
 614                 /* adjust for data copied in but not written */
 615                 ap->a_uio->uio_resid += cc;
 616                 return (error);
 617         }
 618         goto again;
 619 }
 620
 621 /*ARGSUSED*/
 622 static  int
 623 ptyioctl(struct dev_ioctl_args *ap)
 624 {
 625         cdev_t dev = ap->a_head.a_dev;
 626         struct tty *tp = dev->si_tty;
 627         struct pt_ioctl *pti = dev->si_drv1;
 628         u_char *cc = tp->t_cc;
 629         int stop, error;
 630
 631         if (dev_dflags(dev) & D_MASTER) {
 632                 switch (ap->a_cmd) {
 633
 634                 case TIOCGPGRP:
 635                         /*
 636                          * We avoid calling ttioctl on the controller since,
 637                          * in that case, tp must be the controlling terminal.
 638                          */
 639                         *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
 640                         return (0);
 641
 642                 case TIOCPKT:
 643                         if (*(int *)ap->a_data) {
 644                                 if (pti->pt_flags & PF_UCNTL)
 645                                         return (EINVAL);
 646                                 pti->pt_flags |= PF_PKT;
 647                         } else
 648                                 pti->pt_flags &= ~PF_PKT;
 649                         return (0);
 650
 651                 case TIOCUCNTL:
 652                         if (*(int *)ap->a_data) {
 653                                 if (pti->pt_flags & PF_PKT)
 654                                         return (EINVAL);
 655                                 pti->pt_flags |= PF_UCNTL;
 656                         } else
 657                                 pti->pt_flags &= ~PF_UCNTL;
 658                         return (0);
 659
 660                 case TIOCREMOTE:
 661                         if (*(int *)ap->a_data)
 662                                 pti->pt_flags |= PF_REMOTE;
 663                         else
 664                                 pti->pt_flags &= ~PF_REMOTE;
 665                         ttyflush(tp, FREAD|FWRITE);
 666                         return (0);
 667                 }
 668
 669                 /*
 670                  * The rest of the ioctls shouldn't be called until
 671                  * the slave is open.
 672                  */
 673                 if ((tp->t_state & TS_ISOPEN) == 0)
 674                         return (EAGAIN);
 675
 676                 switch (ap->a_cmd) {
 677 #ifdef COMPAT_43
 678                 case TIOCSETP:
 679                 case TIOCSETN:
 680 #endif
 681                 case TIOCSETD:
 682                 case TIOCSETA:
 683                 case TIOCSETAW:
 684                 case TIOCSETAF:
 685                         /*
 686                          * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
 687                          * ttywflush(tp) will hang if there are characters in
 688                          * the outq.
 689                          */
 690                         ndflush(&tp->t_outq, tp->t_outq.c_cc);
 691                         break;
 692
 693                 case TIOCSIG:
 694                         if (*(unsigned int *)ap->a_data >= NSIG ||
 695                             *(unsigned int *)ap->a_data == 0)
 696                                 return(EINVAL);
 697                         if ((tp->t_lflag&NOFLSH) == 0)
 698                                 ttyflush(tp, FREAD|FWRITE);
 699                         pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1);
 700                         if ((*(unsigned int *)ap->a_data == SIGINFO) &&
 701                             ((tp->t_lflag&NOKERNINFO) == 0))
 702                                 ttyinfo(tp);
 703                         return(0);
 704                 }
 705         }
 706         if (ap->a_cmd == TIOCEXT) {
 707                 /*
 708                  * When the EXTPROC bit is being toggled, we need
 709                  * to send an TIOCPKT_IOCTL if the packet driver
 710                  * is turned on.
 711                  */
 712                 if (*(int *)ap->a_data) {
 713                         if (pti->pt_flags & PF_PKT) {
 714                                 pti->pt_send |= TIOCPKT_IOCTL;
 715                                 ptcwakeup(tp, FREAD);
 716                         }
 717                         tp->t_lflag |= EXTPROC;
 718                 } else {
 719                         if ((tp->t_lflag & EXTPROC) &&
 720                             (pti->pt_flags & PF_PKT)) {
 721                                 pti->pt_send |= TIOCPKT_IOCTL;
 722                                 ptcwakeup(tp, FREAD);
 723                         }
 724                         tp->t_lflag &= ~EXTPROC;
 725                 }
 726                 return(0);
 727         }
 728         error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
 729                                               ap->a_fflag, ap->a_cred);
 730         if (error == ENOIOCTL)
 731                  error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
 732         if (error == ENOIOCTL) {
 733                 if (pti->pt_flags & PF_UCNTL &&
 734                     (ap->a_cmd & ~0xff) == UIOCCMD(0)) {
 735                         if (ap->a_cmd & 0xff) {
 736                                 pti->pt_ucntl = (u_char)ap->a_cmd;
 737                                 ptcwakeup(tp, FREAD);
 738                         }
 739                         return (0);
 740                 }
 741                 error = ENOTTY;
 742         }
 743         /*
 744          * If external processing and packet mode send ioctl packet.
 745          */
 746         if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
 747                 switch(ap->a_cmd) {
 748                 case TIOCSETA:
 749                 case TIOCSETAW:
 750                 case TIOCSETAF:
 751 #ifdef COMPAT_43
 752                 case TIOCSETP:
 753                 case TIOCSETN:
 754 #endif
 755 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
 756                 case TIOCSETC:
 757                 case TIOCSLTC:
 758                 case TIOCLBIS:
 759                 case TIOCLBIC:
 760                 case TIOCLSET:
 761 #endif
 762                         pti->pt_send |= TIOCPKT_IOCTL;
 763                         ptcwakeup(tp, FREAD);
 764                 default:
 765                         break;
 766                 }
 767         }
 768         stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
 769                 && CCEQ(cc[VSTART], CTRL('q'));
 770         if (pti->pt_flags & PF_NOSTOP) {
 771                 if (stop) {
 772                         pti->pt_send &= ~TIOCPKT_NOSTOP;
 773                         pti->pt_send |= TIOCPKT_DOSTOP;
 774                         pti->pt_flags &= ~PF_NOSTOP;
 775                         ptcwakeup(tp, FREAD);
 776                 }
 777         } else {
 778                 if (!stop) {
 779                         pti->pt_send &= ~TIOCPKT_DOSTOP;
 780                         pti->pt_send |= TIOCPKT_NOSTOP;
 781                         pti->pt_flags |= PF_NOSTOP;
 782                         ptcwakeup(tp, FREAD);
 783                 }
 784         }
 785         return (error);
 786 }
 787
 788
 789 static void ptc_drvinit (void *unused);
 790
 791 static void
 792 ptc_drvinit(void *unused)
 793 {
 794         dev_ops_add(&pts_ops, 0, 0);
 795         dev_ops_add(&ptc_ops, 0, 0);
 796         /* XXX: Gross hack for DEVFS */
 797         /* XXX: DEVFS is no more, should this be removed? */
 798         ptyinit(0);
 799 }
 800
 801 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)