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 #include <sys/devfs.h>
  63
  64 DEVFS_DECLARE_CLONE_BITMAP(pty);
  65 DEVFS_DECLARE_CLONE_BITMAP(pts);
  66
  67 MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
  68
  69 static void ptsstart (struct tty *tp);
  70 static void ptsstop (struct tty *tp, int rw);
  71 static void ptcwakeup (struct tty *tp, int flag);
  72 static void ptyinit (int n);
  73
  74 static  d_open_t        ptsopen;
  75 static  d_close_t       ptsclose;
  76 static  d_read_t        ptsread;
  77 static  d_write_t       ptswrite;
  78 static  d_ioctl_t       ptyioctl;
  79 static  d_open_t        ptcopen;
  80 static  d_close_t       ptcclose;
  81 static  d_read_t        ptcread;
  82 static  d_write_t       ptcwrite;
  83 static  d_poll_t        ptcpoll;
  84 #if 0
  85 static  d_clone_t       ptyclone;
  86 #endif
  87
  88 #define CDEV_MAJOR_S    5
  89 static struct dev_ops pts_ops = {
  90         { "pts", CDEV_MAJOR_S, D_TTY | D_KQFILTER },
  91         .d_open =       ptsopen,
  92         .d_close =      ptsclose,
  93         .d_read =       ptsread,
  94         .d_write =      ptswrite,
  95         .d_ioctl =      ptyioctl,
  96         .d_poll =       ttypoll,
  97         .d_kqfilter =   ttykqfilter,
  98         .d_revoke =     ttyrevoke
  99 };
 100
 101 #define CDEV_MAJOR_C    6
 102 static struct dev_ops ptc_ops = {
 103         { "ptc", CDEV_MAJOR_C, D_TTY | D_KQFILTER | D_MASTER },
 104         .d_open =       ptcopen,
 105         .d_close =      ptcclose,
 106         .d_read =       ptcread,
 107         .d_write =      ptcwrite,
 108         .d_ioctl =      ptyioctl,
 109         .d_poll =       ptcpoll,
 110         .d_kqfilter =   ttykqfilter,
 111         .d_revoke =     ttyrevoke
 112 };
 113
 114 #define BUFSIZ 100              /* Chunk size iomoved to/from user */
 115
 116 struct  pt_ioctl {
 117         int     pt_flags;
 118         struct  selinfo pt_selr, pt_selw;
 119         u_char  pt_send;
 120         u_char  pt_ucntl;
 121         struct tty pt_tty;
 122         cdev_t  devs, devc;
 123         struct  prison *pt_prison;
 124         short   ref_count;
 125 };
 126
 127 #define PF_PKT          0x08            /* packet mode */
 128 #define PF_STOPPED      0x10            /* user told stopped */
 129 #define PF_REMOTE       0x20            /* remote and flow controlled input */
 130 #define PF_NOSTOP       0x40
 131 #define PF_UCNTL        0x80            /* user control mode */
 132
 133 /*
 134  * This function creates and initializes a pts/ptc pair
 135  *
 136  * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
 137  * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
 138  *
 139  * XXX: define and add mapping of upper minor bits to allow more
 140  *      than 256 ptys.
 141  */
 142 static void
 143 ptyinit(int n)
 144 {
 145         cdev_t devs, devc;
 146         char *names = "pqrsPQRS";
 147         struct pt_ioctl *pt;
 148
 149         /* For now we only map the lower 8 bits of the minor */
 150         if (n & ~0xff)
 151                 return;
 152
 153         pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
 154         pt->devs = devs = make_dev(&pts_ops, n,
 155             0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
 156         pt->devc = devc = make_dev(&ptc_ops, n,
 157             0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
 158
 159         devs->si_drv1 = devc->si_drv1 = pt;
 160         devs->si_tty = devc->si_tty = &pt->pt_tty;
 161         devs->si_flags |= SI_OVERRIDE;  /* uid, gid, perms from dev */
 162         devc->si_flags |= SI_OVERRIDE;  /* uid, gid, perms from dev */
 163         pt->pt_tty.t_dev = devs;
 164         ttyregister(&pt->pt_tty);
 165 }
 166
 167 #if 0
 168 static int
 169 ptyclone(struct dev_clone_args *ap)
 170 {
 171         int unit;
 172         struct pt_ioctl *pt;
 173
 174         unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(pty), 256);
 175
 176         if (unit < 0)
 177                 return 1;
 178
 179         pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
 180         pt->ref_count++;
 181         pt->devc = ap->a_dev = make_only_dev(&ptc_ops, unit, ap->a_cred->cr_ruid, 0, 0600, "ptm/%d", unit);
 182         pt->devs = make_dev(&pts_ops, unit, ap->a_cred->cr_ruid, 0, 0600, "pts/%d", unit);
 183
 184         //reference_dev(pt->devc);
 185         //reference_dev(pt->devs);
 186
 187         pt->devs->si_drv1 = pt->devc->si_drv1 = pt;
 188         pt->devs->si_tty = pt->devc->si_tty = &pt->pt_tty;
 189         pt->pt_tty.t_dev = pt->devs;
 190         ttyregister(&pt->pt_tty);
 191
 192         return 0;
 193 }
 194 #endif
 195
 196 /*ARGSUSED*/
 197 static  int
 198 ptsopen(struct dev_open_args *ap)
 199 {
 200         cdev_t dev = ap->a_head.a_dev;
 201         struct tty *tp;
 202         int error;
 203         struct pt_ioctl *pti;
 204
 205         if (!dev->si_drv1)
 206                 ptyinit(minor(dev));
 207         if (!dev->si_drv1)
 208                 return(ENXIO);
 209         pti = dev->si_drv1;
 210         tp = dev->si_tty;
 211         if ((tp->t_state & TS_ISOPEN) == 0) {
 212                 ttychars(tp);           /* Set up default chars */
 213                 tp->t_iflag = TTYDEF_IFLAG;
 214                 tp->t_oflag = TTYDEF_OFLAG;
 215                 tp->t_lflag = TTYDEF_LFLAG;
 216                 tp->t_cflag = TTYDEF_CFLAG;
 217                 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
 218         } else if ((tp->t_state & TS_XCLUDE) && priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) {
 219                 return (EBUSY);
 220         } else if (pti->pt_prison != ap->a_cred->cr_prison) {
 221                 return (EBUSY);
 222         }
 223         if (tp->t_oproc)                        /* Ctrlr still around. */
 224                 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
 225         while ((tp->t_state & TS_CARR_ON) == 0) {
 226                 if (ap->a_oflags & FNONBLOCK)
 227                         break;
 228                 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0);
 229                 if (error)
 230                         return (error);
 231         }
 232         error = (*linesw[tp->t_line].l_open)(dev, tp);
 233         if (error == 0)
 234                 ptcwakeup(tp, FREAD|FWRITE);
 235
 236 #if 0
 237         /* unix98 pty stuff */
 238         if ((!error) && (!memcmp(dev->si_name, "pts/", 4))) {
 239                 ((struct pt_ioctl *)dev->si_drv1)->ref_count++;
 240                 //reference_dev(dev);
 241                 //reference_dev(((struct pt_ioctl *)dev->si_drv1)->devc);
 242                 //devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(pts), dev->si_uminor-300);
 243         }
 244 #endif
 245
 246         return (error);
 247 }
 248
 249 static  int
 250 ptsclose(struct dev_close_args *ap)
 251 {
 252         cdev_t dev = ap->a_head.a_dev;
 253         struct tty *tp;
 254         int err;
 255 #if 0
 256         /* unix98 pty stuff */
 257         if (!memcmp(dev->si_name, "pts/", 4)) {
 258                 if (--((struct pt_ioctl *)dev->si_drv1)->ref_count == 0) {
 259                         kfree(dev->si_drv1, M_PTY);
 260                         devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty), dev->si_uminor);
 261                         destroy_dev(dev);
 262                 }
 263         }
 264 #endif
 265         tp = dev->si_tty;
 266         err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
 267         ptsstop(tp, FREAD|FWRITE);
 268         (void) ttyclose(tp);
 269         return (err);
 270 }
 271
 272 static  int
 273 ptsread(struct dev_read_args *ap)
 274 {
 275         cdev_t dev = ap->a_head.a_dev;
 276         struct proc *p = curproc;
 277         struct tty *tp = dev->si_tty;
 278         struct pt_ioctl *pti = dev->si_drv1;
 279         struct lwp *lp;
 280
 281         int error = 0;
 282
 283         lp = curthread->td_lwp;
 284
 285 again:
 286         if (pti->pt_flags & PF_REMOTE) {
 287                 while (isbackground(p, tp)) {
 288                         if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
 289                             SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
 290                             p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT)
 291                                 return (EIO);
 292                         pgsignal(p->p_pgrp, SIGTTIN, 1);
 293                         error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
 294                         if (error)
 295                                 return (error);
 296                 }
 297                 if (tp->t_canq.c_cc == 0) {
 298                         if (ap->a_ioflag & IO_NDELAY)
 299                                 return (EWOULDBLOCK);
 300                         error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
 301                                          "ptsin", 0);
 302                         if (error)
 303                                 return (error);
 304                         goto again;
 305                 }
 306                 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0)
 307                         if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) {
 308                                 error = EFAULT;
 309                                 break;
 310                         }
 311                 if (tp->t_canq.c_cc == 1)
 312                         clist_getc(&tp->t_canq);
 313                 if (tp->t_canq.c_cc)
 314                         return (error);
 315         } else
 316                 if (tp->t_oproc)
 317                         error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
 318         ptcwakeup(tp, FWRITE);
 319         return (error);
 320 }
 321
 322 /*
 323  * Write to pseudo-tty.
 324  * Wakeups of controlling tty will happen
 325  * indirectly, when tty driver calls ptsstart.
 326  */
 327 static  int
 328 ptswrite(struct dev_write_args *ap)
 329 {
 330         cdev_t dev = ap->a_head.a_dev;
 331         struct tty *tp;
 332
 333         tp = dev->si_tty;
 334         if (tp->t_oproc == 0)
 335                 return (EIO);
 336         return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
 337 }
 338
 339 /*
 340  * Start output on pseudo-tty.
 341  * Wake up process selecting or sleeping for input from controlling tty.
 342  */
 343 static void
 344 ptsstart(struct tty *tp)
 345 {
 346         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 347
 348         if (tp->t_state & TS_TTSTOP)
 349                 return;
 350         if (pti->pt_flags & PF_STOPPED) {
 351                 pti->pt_flags &= ~PF_STOPPED;
 352                 pti->pt_send = TIOCPKT_START;
 353         }
 354         ptcwakeup(tp, FREAD);
 355 }
 356
 357 static void
 358 ptcwakeup(struct tty *tp, int flag)
 359 {
 360         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 361
 362         if (flag & FREAD) {
 363                 selwakeup(&pti->pt_selr);
 364                 wakeup(TSA_PTC_READ(tp));
 365         }
 366         if (flag & FWRITE) {
 367                 selwakeup(&pti->pt_selw);
 368                 wakeup(TSA_PTC_WRITE(tp));
 369         }
 370 }
 371
 372 static  int
 373 ptcopen(struct dev_open_args *ap)
 374 {
 375         cdev_t dev = ap->a_head.a_dev;
 376         struct tty *tp;
 377         struct pt_ioctl *pti;
 378
 379         if (!dev->si_drv1)
 380                 ptyinit(minor(dev));
 381         if (!dev->si_drv1)
 382                 return(ENXIO);
 383         pti = dev->si_drv1;
 384         if (pti->pt_prison && pti->pt_prison != ap->a_cred->cr_prison)
 385                 return(EBUSY);
 386         tp = dev->si_tty;
 387         if (tp->t_oproc)
 388                 return (EIO);
 389         tp->t_oproc = ptsstart;
 390         tp->t_stop = ptsstop;
 391         (void)(*linesw[tp->t_line].l_modem)(tp, 1);
 392         tp->t_lflag &= ~EXTPROC;
 393         pti->pt_prison = ap->a_cred->cr_prison;
 394         pti->pt_flags = 0;
 395         pti->pt_send = 0;
 396         pti->pt_ucntl = 0;
 397
 398         pti->devs->si_uid = ap->a_cred->cr_uid;
 399         pti->devs->si_gid = 0;
 400         pti->devs->si_perms = 0600;
 401         pti->devc->si_uid = ap->a_cred->cr_uid;
 402         pti->devc->si_gid = 0;
 403         pti->devc->si_perms = 0600;
 404
 405         return (0);
 406 }
 407
 408 static  int
 409 ptcclose(struct dev_close_args *ap)
 410 {
 411         cdev_t dev = ap->a_head.a_dev;
 412         struct tty *tp;
 413         struct pt_ioctl *pti;
 414
 415         tp = dev->si_tty;
 416         (void)(*linesw[tp->t_line].l_modem)(tp, 0);
 417
 418         /*
 419          * XXX MDMBUF makes no sense for ptys but would inhibit the above
 420          * l_modem().  CLOCAL makes sense but isn't supported.   Special
 421          * l_modem()s that ignore carrier drop make no sense for ptys but
 422          * may be in use because other parts of the line discipline make
 423          * sense for ptys.  Recover by doing everything that a normal
 424          * ttymodem() would have done except for sending a SIGHUP.
 425          */
 426         if (tp->t_state & TS_ISOPEN) {
 427                 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
 428                 tp->t_state |= TS_ZOMBIE;
 429                 ttyflush(tp, FREAD | FWRITE);
 430         }
 431         tp->t_oproc = 0;                /* mark closed */
 432
 433         pti = dev->si_drv1;
 434         pti->pt_prison = NULL;
 435         pti->devs->si_uid = 0;
 436         pti->devs->si_gid = 0;
 437         pti->devs->si_perms = 0666;
 438         pti->devc->si_uid = 0;
 439         pti->devc->si_gid = 0;
 440         pti->devc->si_perms = 0666;
 441
 442 #if 0
 443         if (!memcmp(dev->si_name, "ptm/", 4)) {
 444                 ((struct pt_ioctl *)dev->si_drv1)->devc = NULL;
 445                 if (--((struct pt_ioctl *)dev->si_drv1)->ref_count == 0) {
 446                         kfree(dev->si_drv1, M_PTY);
 447                         devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty), dev->si_uminor);
 448                 }
 449                 //release_dev(dev);
 450                 //release_dev(((struct pt_ioctl *)dev->si_drv1)->devs);
 451         }
 452 #endif
 453         return (0);
 454 }
 455
 456 static  int
 457 ptcread(struct dev_read_args *ap)
 458 {
 459         cdev_t dev = ap->a_head.a_dev;
 460         struct tty *tp = dev->si_tty;
 461         struct pt_ioctl *pti = dev->si_drv1;
 462         char buf[BUFSIZ];
 463         int error = 0, cc;
 464
 465         /*
 466          * We want to block until the slave
 467          * is open, and there's something to read;
 468          * but if we lost the slave or we're NBIO,
 469          * then return the appropriate error instead.
 470          */
 471         for (;;) {
 472                 if (tp->t_state&TS_ISOPEN) {
 473                         if (pti->pt_flags&PF_PKT && pti->pt_send) {
 474                                 error = ureadc((int)pti->pt_send, ap->a_uio);
 475                                 if (error)
 476                                         return (error);
 477                                 if (pti->pt_send & TIOCPKT_IOCTL) {
 478                                         cc = (int)szmin(ap->a_uio->uio_resid,
 479                                                         sizeof(tp->t_termios));
 480                                         uiomove((caddr_t)&tp->t_termios, cc,
 481                                                 ap->a_uio);
 482                                 }
 483                                 pti->pt_send = 0;
 484                                 return (0);
 485                         }
 486                         if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
 487                                 error = ureadc((int)pti->pt_ucntl, ap->a_uio);
 488                                 if (error)
 489                                         return (error);
 490                                 pti->pt_ucntl = 0;
 491                                 return (0);
 492                         }
 493                         if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
 494                                 break;
 495                 }
 496                 if ((tp->t_state & TS_CONNECTED) == 0)
 497                         return (0);     /* EOF */
 498                 if (ap->a_ioflag & IO_NDELAY)
 499                         return (EWOULDBLOCK);
 500                 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
 501                 if (error)
 502                         return (error);
 503         }
 504         if (pti->pt_flags & (PF_PKT|PF_UCNTL))
 505                 error = ureadc(0, ap->a_uio);
 506         while (ap->a_uio->uio_resid > 0 && error == 0) {
 507                 cc = q_to_b(&tp->t_outq, buf,
 508                             (int)szmin(ap->a_uio->uio_resid, BUFSIZ));
 509                 if (cc <= 0)
 510                         break;
 511                 error = uiomove(buf, (size_t)cc, ap->a_uio);
 512         }
 513         ttwwakeup(tp);
 514         return (error);
 515 }
 516
 517 static  void
 518 ptsstop(struct tty *tp, int flush)
 519 {
 520         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 521         int flag;
 522
 523         /* note: FLUSHREAD and FLUSHWRITE already ok */
 524         if (flush == 0) {
 525                 flush = TIOCPKT_STOP;
 526                 pti->pt_flags |= PF_STOPPED;
 527         } else
 528                 pti->pt_flags &= ~PF_STOPPED;
 529         pti->pt_send |= flush;
 530         /* change of perspective */
 531         flag = 0;
 532         if (flush & FREAD)
 533                 flag |= FWRITE;
 534         if (flush & FWRITE)
 535                 flag |= FREAD;
 536         ptcwakeup(tp, flag);
 537 }
 538
 539 static  int
 540 ptcpoll(struct dev_poll_args *ap)
 541 {
 542         cdev_t dev = ap->a_head.a_dev;
 543         struct tty *tp = dev->si_tty;
 544         struct pt_ioctl *pti = dev->si_drv1;
 545         int revents = 0;
 546
 547         if ((tp->t_state & TS_CONNECTED) == 0) {
 548                 ap->a_events = seltrue(dev, ap->a_events) | POLLHUP;
 549                 return(0);
 550         }
 551
 552         /*
 553          * Need to block timeouts (ttrstart).
 554          */
 555         crit_enter();
 556
 557         if (ap->a_events & (POLLIN | POLLRDNORM))
 558                 if ((tp->t_state & TS_ISOPEN) &&
 559                     ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
 560                      ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
 561                      ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
 562                         revents |= ap->a_events & (POLLIN | POLLRDNORM);
 563
 564         if (ap->a_events & (POLLOUT | POLLWRNORM))
 565                 if (tp->t_state & TS_ISOPEN &&
 566                     ((pti->pt_flags & PF_REMOTE) ?
 567                      (tp->t_canq.c_cc == 0) :
 568                      ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
 569                       (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
 570                         revents |= ap->a_events & (POLLOUT | POLLWRNORM);
 571
 572         if (ap->a_events & POLLHUP)
 573                 if ((tp->t_state & TS_CARR_ON) == 0)
 574                         revents |= POLLHUP;
 575
 576         if (revents == 0) {
 577                 if (ap->a_events & (POLLIN | POLLRDNORM))
 578                         selrecord(curthread, &pti->pt_selr);
 579
 580                 if (ap->a_events & (POLLOUT | POLLWRNORM))
 581                         selrecord(curthread, &pti->pt_selw);
 582         }
 583         crit_exit();
 584
 585         ap->a_events = revents;
 586         return (0);
 587 }
 588
 589 static  int
 590 ptcwrite(struct dev_write_args *ap)
 591 {
 592         cdev_t dev = ap->a_head.a_dev;
 593         struct tty *tp = dev->si_tty;
 594         u_char *cp = 0;
 595         int cc = 0;
 596         u_char locbuf[BUFSIZ];
 597         int cnt = 0;
 598         struct pt_ioctl *pti = dev->si_drv1;
 599         int error = 0;
 600
 601 again:
 602         if ((tp->t_state&TS_ISOPEN) == 0)
 603                 goto block;
 604         if (pti->pt_flags & PF_REMOTE) {
 605                 if (tp->t_canq.c_cc)
 606                         goto block;
 607                 while ((ap->a_uio->uio_resid > 0 || cc > 0) &&
 608                        tp->t_canq.c_cc < TTYHOG - 1) {
 609                         if (cc == 0) {
 610                                 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
 611                                 cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc);
 612                                 cp = locbuf;
 613                                 error = uiomove(cp, (size_t)cc, ap->a_uio);
 614                                 if (error)
 615                                         return (error);
 616                                 /* check again for safety */
 617                                 if ((tp->t_state & TS_ISOPEN) == 0) {
 618                                         /* adjust as usual */
 619                                         ap->a_uio->uio_resid += cc;
 620                                         return (EIO);
 621                                 }
 622                         }
 623                         if (cc > 0) {
 624                                 cc = b_to_q((char *)cp, cc, &tp->t_canq);
 625                                 /*
 626                                  * XXX we don't guarantee that the canq size
 627                                  * is >= TTYHOG, so the above b_to_q() may
 628                                  * leave some bytes uncopied.  However, space
 629                                  * is guaranteed for the null terminator if
 630                                  * we don't fail here since (TTYHOG - 1) is
 631                                  * not a multiple of CBSIZE.
 632                                  */
 633                                 if (cc > 0)
 634                                         break;
 635                         }
 636                 }
 637                 /* adjust for data copied in but not written */
 638                 ap->a_uio->uio_resid += cc;
 639                 clist_putc(0, &tp->t_canq);
 640                 ttwakeup(tp);
 641                 wakeup(TSA_PTS_READ(tp));
 642                 return (0);
 643         }
 644         while (ap->a_uio->uio_resid > 0 || cc > 0) {
 645                 if (cc == 0) {
 646                         cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
 647                         cp = locbuf;
 648                         error = uiomove(cp, (size_t)cc, ap->a_uio);
 649                         if (error)
 650                                 return (error);
 651                         /* check again for safety */
 652                         if ((tp->t_state & TS_ISOPEN) == 0) {
 653                                 /* adjust for data copied in but not written */
 654                                 ap->a_uio->uio_resid += cc;
 655                                 return (EIO);
 656                         }
 657                 }
 658                 while (cc > 0) {
 659                         if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
 660                            (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
 661                                 wakeup(TSA_HUP_OR_INPUT(tp));
 662                                 goto block;
 663                         }
 664                         (*linesw[tp->t_line].l_rint)(*cp++, tp);
 665                         cnt++;
 666                         cc--;
 667                 }
 668                 cc = 0;
 669         }
 670         return (0);
 671 block:
 672         /*
 673          * Come here to wait for slave to open, for space
 674          * in outq, or space in rawq, or an empty canq.
 675          */
 676         if ((tp->t_state & TS_CONNECTED) == 0) {
 677                 /* adjust for data copied in but not written */
 678                 ap->a_uio->uio_resid += cc;
 679                 return (EIO);
 680         }
 681         if (ap->a_ioflag & IO_NDELAY) {
 682                 /* adjust for data copied in but not written */
 683                 ap->a_uio->uio_resid += cc;
 684                 if (cnt == 0)
 685                         return (EWOULDBLOCK);
 686                 return (0);
 687         }
 688         error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
 689         if (error) {
 690                 /* adjust for data copied in but not written */
 691                 ap->a_uio->uio_resid += cc;
 692                 return (error);
 693         }
 694         goto again;
 695 }
 696
 697 /*ARGSUSED*/
 698 static  int
 699 ptyioctl(struct dev_ioctl_args *ap)
 700 {
 701         cdev_t dev = ap->a_head.a_dev;
 702         struct tty *tp = dev->si_tty;
 703         struct pt_ioctl *pti = dev->si_drv1;
 704         u_char *cc = tp->t_cc;
 705         int stop, error;
 706
 707         if (dev_dflags(dev) & D_MASTER) {
 708                 switch (ap->a_cmd) {
 709
 710                 case TIOCGPGRP:
 711                         /*
 712                          * We avoid calling ttioctl on the controller since,
 713                          * in that case, tp must be the controlling terminal.
 714                          */
 715                         *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
 716                         return (0);
 717
 718                 case TIOCPKT:
 719                         if (*(int *)ap->a_data) {
 720                                 if (pti->pt_flags & PF_UCNTL)
 721                                         return (EINVAL);
 722                                 pti->pt_flags |= PF_PKT;
 723                         } else
 724                                 pti->pt_flags &= ~PF_PKT;
 725                         return (0);
 726
 727                 case TIOCUCNTL:
 728                         if (*(int *)ap->a_data) {
 729                                 if (pti->pt_flags & PF_PKT)
 730                                         return (EINVAL);
 731                                 pti->pt_flags |= PF_UCNTL;
 732                         } else
 733                                 pti->pt_flags &= ~PF_UCNTL;
 734                         return (0);
 735
 736                 case TIOCREMOTE:
 737                         if (*(int *)ap->a_data)
 738                                 pti->pt_flags |= PF_REMOTE;
 739                         else
 740                                 pti->pt_flags &= ~PF_REMOTE;
 741                         ttyflush(tp, FREAD|FWRITE);
 742                         return (0);
 743                 }
 744
 745                 /*
 746                  * The rest of the ioctls shouldn't be called until
 747                  * the slave is open.
 748                  */
 749                 if ((tp->t_state & TS_ISOPEN) == 0)
 750                         return (EAGAIN);
 751
 752                 switch (ap->a_cmd) {
 753 #ifdef COMPAT_43
 754                 case TIOCSETP:
 755                 case TIOCSETN:
 756 #endif
 757                 case TIOCSETD:
 758                 case TIOCSETA:
 759                 case TIOCSETAW:
 760                 case TIOCSETAF:
 761                         /*
 762                          * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
 763                          * ttywflush(tp) will hang if there are characters in
 764                          * the outq.
 765                          */
 766                         ndflush(&tp->t_outq, tp->t_outq.c_cc);
 767                         break;
 768
 769                 case TIOCSIG:
 770                         if (*(unsigned int *)ap->a_data >= NSIG ||
 771                             *(unsigned int *)ap->a_data == 0)
 772                                 return(EINVAL);
 773                         if ((tp->t_lflag&NOFLSH) == 0)
 774                                 ttyflush(tp, FREAD|FWRITE);
 775                         pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1);
 776                         if ((*(unsigned int *)ap->a_data == SIGINFO) &&
 777                             ((tp->t_lflag&NOKERNINFO) == 0))
 778                                 ttyinfo(tp);
 779                         return(0);
 780                 }
 781         }
 782         if (ap->a_cmd == TIOCEXT) {
 783                 /*
 784                  * When the EXTPROC bit is being toggled, we need
 785                  * to send an TIOCPKT_IOCTL if the packet driver
 786                  * is turned on.
 787                  */
 788                 if (*(int *)ap->a_data) {
 789                         if (pti->pt_flags & PF_PKT) {
 790                                 pti->pt_send |= TIOCPKT_IOCTL;
 791                                 ptcwakeup(tp, FREAD);
 792                         }
 793                         tp->t_lflag |= EXTPROC;
 794                 } else {
 795                         if ((tp->t_lflag & EXTPROC) &&
 796                             (pti->pt_flags & PF_PKT)) {
 797                                 pti->pt_send |= TIOCPKT_IOCTL;
 798                                 ptcwakeup(tp, FREAD);
 799                         }
 800                         tp->t_lflag &= ~EXTPROC;
 801                 }
 802                 return(0);
 803         }
 804         error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
 805                                               ap->a_fflag, ap->a_cred);
 806         if (error == ENOIOCTL)
 807                  error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
 808         if (error == ENOIOCTL) {
 809                 if (pti->pt_flags & PF_UCNTL &&
 810                     (ap->a_cmd & ~0xff) == UIOCCMD(0)) {
 811                         if (ap->a_cmd & 0xff) {
 812                                 pti->pt_ucntl = (u_char)ap->a_cmd;
 813                                 ptcwakeup(tp, FREAD);
 814                         }
 815                         return (0);
 816                 }
 817                 error = ENOTTY;
 818         }
 819         /*
 820          * If external processing and packet mode send ioctl packet.
 821          */
 822         if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
 823                 switch(ap->a_cmd) {
 824                 case TIOCSETA:
 825                 case TIOCSETAW:
 826                 case TIOCSETAF:
 827 #ifdef COMPAT_43
 828                 case TIOCSETP:
 829                 case TIOCSETN:
 830 #endif
 831 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
 832                 case TIOCSETC:
 833                 case TIOCSLTC:
 834                 case TIOCLBIS:
 835                 case TIOCLBIC:
 836                 case TIOCLSET:
 837 #endif
 838                         pti->pt_send |= TIOCPKT_IOCTL;
 839                         ptcwakeup(tp, FREAD);
 840                 default:
 841                         break;
 842                 }
 843         }
 844         stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
 845                 && CCEQ(cc[VSTART], CTRL('q'));
 846         if (pti->pt_flags & PF_NOSTOP) {
 847                 if (stop) {
 848                         pti->pt_send &= ~TIOCPKT_NOSTOP;
 849                         pti->pt_send |= TIOCPKT_DOSTOP;
 850                         pti->pt_flags &= ~PF_NOSTOP;
 851                         ptcwakeup(tp, FREAD);
 852                 }
 853         } else {
 854                 if (!stop) {
 855                         pti->pt_send &= ~TIOCPKT_DOSTOP;
 856                         pti->pt_send |= TIOCPKT_NOSTOP;
 857                         pti->pt_flags |= PF_NOSTOP;
 858                         ptcwakeup(tp, FREAD);
 859                 }
 860         }
 861         return (error);
 862 }
 863
 864
 865 static void ptc_drvinit (void *unused);
 866
 867 static void
 868 ptc_drvinit(void *unused)
 869 {
 870         int i;
 871
 872         devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(pty));
 873         devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(pts));
 874
 875 #if 0
 876         /* Unix98 pty stuff, leave out for now */
 877         make_dev(&ptc_ops, 0, 0, 0, 0666, "ptmx");
 878         devfs_clone_handler_add("ptmx", ptyclone);
 879 #endif
 880         for (i = 0; i < 256; i++) {
 881                 ptyinit(i);
 882         }
 883 }
 884
 885 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)