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 #include <sys/stat.h>
  64 #include <sys/sysctl.h>
  65
  66 #define UNIX98_PTYS     1
  67
  68 MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
  69
  70 static void ptsstart (struct tty *tp);
  71 static void ptsstop (struct tty *tp, int rw);
  72 static void ptcwakeup (struct tty *tp, int flag);
  73 static void ptyinit (int n);
  74
  75 static  d_open_t        ptsopen;
  76 static  d_close_t       ptsclose;
  77 static  d_read_t        ptsread;
  78 static  d_write_t       ptswrite;
  79 static  d_ioctl_t       ptyioctl;
  80 static  d_open_t        ptcopen;
  81 static  d_close_t       ptcclose;
  82 static  d_read_t        ptcread;
  83 static  d_write_t       ptcwrite;
  84 static  d_poll_t        ptcpoll;
  85
  86 #ifdef UNIX98_PTYS
  87 DEVFS_DECLARE_CLONE_BITMAP(pty);
  88
  89 static  d_clone_t       ptyclone;
  90
  91 static int      pty_debug_level = 0;
  92
  93 static struct dev_ops pts98_ops = {
  94         { "pts98", 0, D_TTY | D_KQFILTER },
  95         .d_open =       ptsopen,
  96         .d_close =      ptsclose,
  97         .d_read =       ptsread,
  98         .d_write =      ptswrite,
  99         .d_ioctl =      ptyioctl,
 100         .d_poll =       ttypoll,
 101         .d_kqfilter =   ttykqfilter,
 102         .d_revoke =     ttyrevoke
 103 };
 104
 105 static struct dev_ops ptc98_ops = {
 106         { "ptc98", 0, D_TTY | D_KQFILTER | D_MASTER },
 107         .d_open =       ptcopen,
 108         .d_close =      ptcclose,
 109         .d_read =       ptcread,
 110         .d_write =      ptcwrite,
 111         .d_ioctl =      ptyioctl,
 112         .d_poll =       ptcpoll,
 113         .d_kqfilter =   ttykqfilter,
 114         .d_revoke =     ttyrevoke
 115 };
 116 #endif
 117
 118 #define CDEV_MAJOR_S    5
 119 static struct dev_ops pts_ops = {
 120         { "pts", CDEV_MAJOR_S, D_TTY | D_KQFILTER },
 121         .d_open =       ptsopen,
 122         .d_close =      ptsclose,
 123         .d_read =       ptsread,
 124         .d_write =      ptswrite,
 125         .d_ioctl =      ptyioctl,
 126         .d_poll =       ttypoll,
 127         .d_kqfilter =   ttykqfilter,
 128         .d_revoke =     ttyrevoke
 129 };
 130
 131 #define CDEV_MAJOR_C    6
 132 static struct dev_ops ptc_ops = {
 133         { "ptc", CDEV_MAJOR_C, D_TTY | D_KQFILTER | D_MASTER },
 134         .d_open =       ptcopen,
 135         .d_close =      ptcclose,
 136         .d_read =       ptcread,
 137         .d_write =      ptcwrite,
 138         .d_ioctl =      ptyioctl,
 139         .d_poll =       ptcpoll,
 140         .d_kqfilter =   ttykqfilter,
 141         .d_revoke =     ttyrevoke
 142 };
 143
 144 #define BUFSIZ 100              /* Chunk size iomoved to/from user */
 145
 146 struct  pt_ioctl {
 147         int     pt_flags;
 148         int     pt_flags2;
 149         struct  selinfo pt_selr, pt_selw;
 150         u_char  pt_send;
 151         u_char  pt_ucntl;
 152         struct tty pt_tty;
 153         cdev_t  devs, devc;
 154         struct  prison *pt_prison;
 155 };
 156
 157 #define PF_PKT          0x08            /* packet mode */
 158 #define PF_STOPPED      0x10            /* user told stopped */
 159 #define PF_REMOTE       0x20            /* remote and flow controlled input */
 160 #define PF_NOSTOP       0x40
 161 #define PF_UCNTL        0x80            /* user control mode */
 162
 163 #define PF_UNIX98       0x01
 164 #define PF_SOPEN        0x02
 165 #define PF_MOPEN        0x04
 166
 167 static int
 168 ptydebug(int level, char *fmt, ...)
 169 {
 170         __va_list ap;
 171
 172         __va_start(ap, fmt);
 173         if (level <= pty_debug_level)
 174                 kvprintf(fmt, ap);
 175         __va_end(ap);
 176
 177         return 0;
 178 }
 179
 180 /*
 181  * This function creates and initializes a pts/ptc pair
 182  *
 183  * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
 184  * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
 185  *
 186  * XXX: define and add mapping of upper minor bits to allow more
 187  *      than 256 ptys.
 188  */
 189 static void
 190 ptyinit(int n)
 191 {
 192         cdev_t devs, devc;
 193         char *names = "pqrsPQRS";
 194         struct pt_ioctl *pt;
 195
 196         /* For now we only map the lower 8 bits of the minor */
 197         if (n & ~0xff)
 198                 return;
 199
 200         pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
 201         pt->devs = devs = make_dev(&pts_ops, n,
 202             0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
 203         pt->devc = devc = make_dev(&ptc_ops, n,
 204             0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
 205
 206         devs->si_drv1 = devc->si_drv1 = pt;
 207         devs->si_tty = devc->si_tty = &pt->pt_tty;
 208         devs->si_flags |= SI_OVERRIDE;  /* uid, gid, perms from dev */
 209         devc->si_flags |= SI_OVERRIDE;  /* uid, gid, perms from dev */
 210         pt->pt_tty.t_dev = devs;
 211         ttyregister(&pt->pt_tty);
 212 }
 213
 214 #ifdef UNIX98_PTYS
 215 static int
 216 ptyclone(struct dev_clone_args *ap)
 217 {
 218         int unit;
 219         struct pt_ioctl *pt;
 220
 221         /*
 222          * Limit the number of unix98 pty (slave) devices to 1000, as
 223          * the utmp(5) format only allows for 8 bytes for the tty,
 224          * "pts/XXX".
 225          * If this limit is reached, we don't clone and return error
 226          * to devfs.
 227          */
 228         unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(pty), 1000);
 229
 230         if (unit < 0) {
 231                 ap->a_dev = NULL;
 232                 return 1;
 233         }
 234
 235         pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
 236
 237         pt->devc = ap->a_dev = make_only_dev(&ptc98_ops, unit, ap->a_cred->cr_ruid,
 238             0, 0600, "ptm/%d", unit);
 239         pt->devs = make_dev(&pts98_ops, unit, ap->a_cred->cr_ruid, GID_TTY, 0620,
 240             "pts/%d", unit);
 241
 242         pt->devs->si_flags |= SI_OVERRIDE;      /* uid, gid, perms from dev */
 243         pt->devc->si_flags |= SI_OVERRIDE;      /* uid, gid, perms from dev */
 244
 245         pt->devs->si_drv1 = pt->devc->si_drv1 = pt;
 246         pt->devs->si_tty = pt->devc->si_tty = &pt->pt_tty;
 247         pt->pt_tty.t_dev = pt->devs;
 248         pt->pt_flags2 |= PF_UNIX98;
 249
 250         ttyregister(&pt->pt_tty);
 251
 252         return 0;
 253 }
 254 #endif
 255
 256 /*ARGSUSED*/
 257 static  int
 258 ptsopen(struct dev_open_args *ap)
 259 {
 260         cdev_t dev = ap->a_head.a_dev;
 261         struct tty *tp;
 262         int error;
 263         struct pt_ioctl *pti;
 264
 265         if (!dev->si_drv1)
 266                 ptyinit(minor(dev));
 267         if (!dev->si_drv1)
 268                 return(ENXIO);
 269         pti = dev->si_drv1;
 270         tp = dev->si_tty;
 271         if ((tp->t_state & TS_ISOPEN) == 0) {
 272                 ttychars(tp);           /* Set up default chars */
 273                 tp->t_iflag = TTYDEF_IFLAG;
 274                 tp->t_oflag = TTYDEF_OFLAG;
 275                 tp->t_lflag = TTYDEF_LFLAG;
 276                 tp->t_cflag = TTYDEF_CFLAG;
 277                 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
 278         } else if ((tp->t_state & TS_XCLUDE) && priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) {
 279                 return (EBUSY);
 280         } else if (pti->pt_prison != ap->a_cred->cr_prison) {
 281                 return (EBUSY);
 282         }
 283         if (tp->t_oproc)                        /* Ctrlr still around. */
 284                 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
 285         while ((tp->t_state & TS_CARR_ON) == 0) {
 286                 if (ap->a_oflags & FNONBLOCK)
 287                         break;
 288                 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0);
 289                 if (error)
 290                         return (error);
 291         }
 292         error = (*linesw[tp->t_line].l_open)(dev, tp);
 293         if (error == 0)
 294                 ptcwakeup(tp, FREAD|FWRITE);
 295
 296 #ifdef UNIX98_PTYS
 297         /*
 298          * Unix98 pty stuff.
 299          * On open of the slave, we set the corresponding flag in the common
 300          * struct.
 301          */
 302         ptydebug(1, "ptsopen=%s | unix98? %s\n", dev->si_name,
 303             (pti->pt_flags2 & PF_UNIX98)?"yes":"no");
 304
 305         if ((!error) && (pti->pt_flags2 & PF_UNIX98)) {
 306                 pti->pt_flags2 |= PF_SOPEN;
 307         }
 308 #endif
 309
 310         return (error);
 311 }
 312
 313 static  int
 314 ptsclose(struct dev_close_args *ap)
 315 {
 316         cdev_t dev = ap->a_head.a_dev;
 317         struct tty *tp;
 318         struct pt_ioctl *pti = dev->si_drv1;
 319         int err;
 320
 321         tp = dev->si_tty;
 322         err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
 323         ptsstop(tp, FREAD|FWRITE);
 324         (void) ttyclose(tp);
 325
 326 #ifdef UNIX98_PTYS
 327         /*
 328          * Unix98 pty stuff.
 329          * On close of the slave, we unset the corresponding flag, and if the master
 330          * isn't open anymore, we destroy the slave and unset the unit.
 331          */
 332         ptydebug(1, "ptsclose=%s | unix98? %s\n", dev->si_name,
 333             (pti->pt_flags2 & PF_UNIX98)?"yes":"no");
 334
 335         if (pti->pt_flags2 & PF_UNIX98) {
 336                 pti->pt_flags2 &= ~PF_SOPEN;
 337                 KKASSERT((pti->pt_flags2 & PF_SOPEN) == 0);
 338                 ptydebug(1, "master open? %s\n",
 339                     (pti->pt_flags2 & PF_MOPEN)?"yes":"no");
 340
 341                 if (!(pti->pt_flags2 & PF_SOPEN) && !(pti->pt_flags2 & PF_MOPEN)) {
 342                         devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty), dev->si_uminor);
 343                         destroy_dev(dev);
 344                 }
 345         }
 346 #endif
 347
 348         return (err);
 349 }
 350
 351 static  int
 352 ptsread(struct dev_read_args *ap)
 353 {
 354         cdev_t dev = ap->a_head.a_dev;
 355         struct proc *p = curproc;
 356         struct tty *tp = dev->si_tty;
 357         struct pt_ioctl *pti = dev->si_drv1;
 358         struct lwp *lp;
 359
 360         int error = 0;
 361
 362         lp = curthread->td_lwp;
 363
 364 again:
 365         if (pti->pt_flags & PF_REMOTE) {
 366                 while (isbackground(p, tp)) {
 367                         if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
 368                             SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
 369                             p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT)
 370                                 return (EIO);
 371                         pgsignal(p->p_pgrp, SIGTTIN, 1);
 372                         error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
 373                         if (error)
 374                                 return (error);
 375                 }
 376                 if (tp->t_canq.c_cc == 0) {
 377                         if (ap->a_ioflag & IO_NDELAY)
 378                                 return (EWOULDBLOCK);
 379                         error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
 380                                          "ptsin", 0);
 381                         if (error)
 382                                 return (error);
 383                         goto again;
 384                 }
 385                 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0)
 386                         if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) {
 387                                 error = EFAULT;
 388                                 break;
 389                         }
 390                 if (tp->t_canq.c_cc == 1)
 391                         clist_getc(&tp->t_canq);
 392                 if (tp->t_canq.c_cc)
 393                         return (error);
 394         } else
 395                 if (tp->t_oproc)
 396                         error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
 397         ptcwakeup(tp, FWRITE);
 398         return (error);
 399 }
 400
 401 /*
 402  * Write to pseudo-tty.
 403  * Wakeups of controlling tty will happen
 404  * indirectly, when tty driver calls ptsstart.
 405  */
 406 static  int
 407 ptswrite(struct dev_write_args *ap)
 408 {
 409         cdev_t dev = ap->a_head.a_dev;
 410         struct tty *tp;
 411
 412         tp = dev->si_tty;
 413         if (tp->t_oproc == 0)
 414                 return (EIO);
 415         return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
 416 }
 417
 418 /*
 419  * Start output on pseudo-tty.
 420  * Wake up process selecting or sleeping for input from controlling tty.
 421  */
 422 static void
 423 ptsstart(struct tty *tp)
 424 {
 425         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 426
 427         if (tp->t_state & TS_TTSTOP)
 428                 return;
 429         if (pti->pt_flags & PF_STOPPED) {
 430                 pti->pt_flags &= ~PF_STOPPED;
 431                 pti->pt_send = TIOCPKT_START;
 432         }
 433         ptcwakeup(tp, FREAD);
 434 }
 435
 436 static void
 437 ptcwakeup(struct tty *tp, int flag)
 438 {
 439         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 440
 441         if (flag & FREAD) {
 442                 selwakeup(&pti->pt_selr);
 443                 wakeup(TSA_PTC_READ(tp));
 444         }
 445         if (flag & FWRITE) {
 446                 selwakeup(&pti->pt_selw);
 447                 wakeup(TSA_PTC_WRITE(tp));
 448         }
 449 }
 450
 451 static  int
 452 ptcopen(struct dev_open_args *ap)
 453 {
 454         cdev_t dev = ap->a_head.a_dev;
 455         struct tty *tp;
 456         struct pt_ioctl *pti;
 457
 458         if (!dev->si_drv1)
 459                 ptyinit(minor(dev));
 460         if (!dev->si_drv1)
 461                 return(ENXIO);
 462         pti = dev->si_drv1;
 463         if (pti->pt_prison && pti->pt_prison != ap->a_cred->cr_prison)
 464                 return(EBUSY);
 465         tp = dev->si_tty;
 466         if (tp->t_oproc)
 467                 return (EIO);
 468         tp->t_oproc = ptsstart;
 469         tp->t_stop = ptsstop;
 470         (void)(*linesw[tp->t_line].l_modem)(tp, 1);
 471         tp->t_lflag &= ~EXTPROC;
 472         pti->pt_prison = ap->a_cred->cr_prison;
 473         pti->pt_flags = 0;
 474         pti->pt_send = 0;
 475         pti->pt_ucntl = 0;
 476
 477         pti->devs->si_uid = ap->a_cred->cr_uid;
 478         pti->devs->si_gid = 0;
 479         pti->devs->si_perms = 0600;
 480         pti->devc->si_uid = ap->a_cred->cr_uid;
 481         pti->devc->si_gid = 0;
 482         pti->devc->si_perms = 0600;
 483
 484 #ifdef UNIX98_PTYS
 485         /*
 486          * Unix98 pty stuff.
 487          * On open of the master, we set the corresponding flag in the common
 488          * struct.
 489          */
 490         ptydebug(1, "ptcopen=%s (master) | unix98? %s\n", dev->si_name,
 491             (pti->pt_flags2 & PF_UNIX98)?"yes":"no");
 492
 493         if (pti->pt_flags2 & PF_UNIX98) {
 494                 pti->pt_flags2 |= PF_MOPEN;
 495         }
 496 #endif
 497
 498         return (0);
 499 }
 500
 501 static  int
 502 ptcclose(struct dev_close_args *ap)
 503 {
 504         cdev_t dev = ap->a_head.a_dev;
 505         struct tty *tp;
 506         struct pt_ioctl *pti = dev->si_drv1;
 507
 508         tp = dev->si_tty;
 509         (void)(*linesw[tp->t_line].l_modem)(tp, 0);
 510
 511 #ifdef UNIX98_PTYS
 512         /*
 513          * Unix98 pty stuff.
 514          * On close of the master, we unset the corresponding flag in the common
 515          * struct asap.
 516          */
 517         pti->pt_flags2 &= ~PF_MOPEN;
 518 #endif
 519
 520         /*
 521          * XXX MDMBUF makes no sense for ptys but would inhibit the above
 522          * l_modem().  CLOCAL makes sense but isn't supported.   Special
 523          * l_modem()s that ignore carrier drop make no sense for ptys but
 524          * may be in use because other parts of the line discipline make
 525          * sense for ptys.  Recover by doing everything that a normal
 526          * ttymodem() would have done except for sending a SIGHUP.
 527          */
 528         if (tp->t_state & TS_ISOPEN) {
 529                 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
 530                 tp->t_state |= TS_ZOMBIE;
 531                 ttyflush(tp, FREAD | FWRITE);
 532         }
 533         tp->t_oproc = 0;                /* mark closed */
 534
 535         pti = dev->si_drv1;
 536         pti->pt_prison = NULL;
 537         pti->devs->si_uid = 0;
 538         pti->devs->si_gid = 0;
 539         pti->devs->si_perms = 0666;
 540         pti->devc->si_uid = 0;
 541         pti->devc->si_gid = 0;
 542         pti->devc->si_perms = 0666;
 543
 544 #ifdef UNIX98_PTYS
 545         /*
 546          * Unix98 pty stuff.
 547          * On close of the master, we destroy the master and, if no slaves are open,
 548          * we destroy the slave device and unset the unit.
 549          */
 550         ptydebug(1, "ptcclose=%s (master) | unix98? %s\n", dev->si_name,
 551             (pti->pt_flags2 & PF_UNIX98)?"yes":"no");
 552         if (pti->pt_flags2 & PF_UNIX98) {
 553                 KKASSERT((pti->pt_flags2 & PF_MOPEN) == 0);
 554                 destroy_dev(dev);
 555                 pti->devc = NULL;
 556
 557                 if (!(pti->pt_flags2 & PF_SOPEN)) {
 558                         ptydebug(1, "ptcclose: slaves are not open\n");
 559                         destroy_dev(pti->devs);
 560                         devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty), dev->si_uminor);
 561                 }
 562         }
 563 #endif
 564
 565         return (0);
 566 }
 567
 568 static  int
 569 ptcread(struct dev_read_args *ap)
 570 {
 571         cdev_t dev = ap->a_head.a_dev;
 572         struct tty *tp = dev->si_tty;
 573         struct pt_ioctl *pti = dev->si_drv1;
 574         char buf[BUFSIZ];
 575         int error = 0, cc;
 576
 577         /*
 578          * We want to block until the slave
 579          * is open, and there's something to read;
 580          * but if we lost the slave or we're NBIO,
 581          * then return the appropriate error instead.
 582          */
 583         for (;;) {
 584                 if (tp->t_state&TS_ISOPEN) {
 585                         if (pti->pt_flags&PF_PKT && pti->pt_send) {
 586                                 error = ureadc((int)pti->pt_send, ap->a_uio);
 587                                 if (error)
 588                                         return (error);
 589                                 if (pti->pt_send & TIOCPKT_IOCTL) {
 590                                         cc = (int)szmin(ap->a_uio->uio_resid,
 591                                                         sizeof(tp->t_termios));
 592                                         uiomove((caddr_t)&tp->t_termios, cc,
 593                                                 ap->a_uio);
 594                                 }
 595                                 pti->pt_send = 0;
 596                                 return (0);
 597                         }
 598                         if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
 599                                 error = ureadc((int)pti->pt_ucntl, ap->a_uio);
 600                                 if (error)
 601                                         return (error);
 602                                 pti->pt_ucntl = 0;
 603                                 return (0);
 604                         }
 605                         if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
 606                                 break;
 607                 }
 608                 if ((tp->t_state & TS_CONNECTED) == 0)
 609                         return (0);     /* EOF */
 610                 if (ap->a_ioflag & IO_NDELAY)
 611                         return (EWOULDBLOCK);
 612                 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
 613                 if (error)
 614                         return (error);
 615         }
 616         if (pti->pt_flags & (PF_PKT|PF_UCNTL))
 617                 error = ureadc(0, ap->a_uio);
 618         while (ap->a_uio->uio_resid > 0 && error == 0) {
 619                 cc = q_to_b(&tp->t_outq, buf,
 620                             (int)szmin(ap->a_uio->uio_resid, BUFSIZ));
 621                 if (cc <= 0)
 622                         break;
 623                 error = uiomove(buf, (size_t)cc, ap->a_uio);
 624         }
 625         ttwwakeup(tp);
 626         return (error);
 627 }
 628
 629 static  void
 630 ptsstop(struct tty *tp, int flush)
 631 {
 632         struct pt_ioctl *pti = tp->t_dev->si_drv1;
 633         int flag;
 634
 635         /* note: FLUSHREAD and FLUSHWRITE already ok */
 636         if (flush == 0) {
 637                 flush = TIOCPKT_STOP;
 638                 pti->pt_flags |= PF_STOPPED;
 639         } else
 640                 pti->pt_flags &= ~PF_STOPPED;
 641         pti->pt_send |= flush;
 642         /* change of perspective */
 643         flag = 0;
 644         if (flush & FREAD)
 645                 flag |= FWRITE;
 646         if (flush & FWRITE)
 647                 flag |= FREAD;
 648         ptcwakeup(tp, flag);
 649 }
 650
 651 static  int
 652 ptcpoll(struct dev_poll_args *ap)
 653 {
 654         cdev_t dev = ap->a_head.a_dev;
 655         struct tty *tp = dev->si_tty;
 656         struct pt_ioctl *pti = dev->si_drv1;
 657         int revents = 0;
 658
 659         if ((tp->t_state & TS_CONNECTED) == 0) {
 660                 ap->a_events = seltrue(dev, ap->a_events) | POLLHUP;
 661                 return(0);
 662         }
 663
 664         /*
 665          * Need to block timeouts (ttrstart).
 666          */
 667         crit_enter();
 668
 669         if (ap->a_events & (POLLIN | POLLRDNORM))
 670                 if ((tp->t_state & TS_ISOPEN) &&
 671                     ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
 672                      ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
 673                      ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
 674                         revents |= ap->a_events & (POLLIN | POLLRDNORM);
 675
 676         if (ap->a_events & (POLLOUT | POLLWRNORM))
 677                 if (tp->t_state & TS_ISOPEN &&
 678                     ((pti->pt_flags & PF_REMOTE) ?
 679                      (tp->t_canq.c_cc == 0) :
 680                      ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
 681                       (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
 682                         revents |= ap->a_events & (POLLOUT | POLLWRNORM);
 683
 684         if (ap->a_events & POLLHUP)
 685                 if ((tp->t_state & TS_CARR_ON) == 0)
 686                         revents |= POLLHUP;
 687
 688         if (revents == 0) {
 689                 if (ap->a_events & (POLLIN | POLLRDNORM))
 690                         selrecord(curthread, &pti->pt_selr);
 691
 692                 if (ap->a_events & (POLLOUT | POLLWRNORM))
 693                         selrecord(curthread, &pti->pt_selw);
 694         }
 695         crit_exit();
 696
 697         ap->a_events = revents;
 698         return (0);
 699 }
 700
 701 static  int
 702 ptcwrite(struct dev_write_args *ap)
 703 {
 704         cdev_t dev = ap->a_head.a_dev;
 705         struct tty *tp = dev->si_tty;
 706         u_char *cp = 0;
 707         int cc = 0;
 708         u_char locbuf[BUFSIZ];
 709         int cnt = 0;
 710         struct pt_ioctl *pti = dev->si_drv1;
 711         int error = 0;
 712
 713 again:
 714         if ((tp->t_state&TS_ISOPEN) == 0)
 715                 goto block;
 716         if (pti->pt_flags & PF_REMOTE) {
 717                 if (tp->t_canq.c_cc)
 718                         goto block;
 719                 while ((ap->a_uio->uio_resid > 0 || cc > 0) &&
 720                        tp->t_canq.c_cc < TTYHOG - 1) {
 721                         if (cc == 0) {
 722                                 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
 723                                 cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc);
 724                                 cp = locbuf;
 725                                 error = uiomove(cp, (size_t)cc, ap->a_uio);
 726                                 if (error)
 727                                         return (error);
 728                                 /* check again for safety */
 729                                 if ((tp->t_state & TS_ISOPEN) == 0) {
 730                                         /* adjust as usual */
 731                                         ap->a_uio->uio_resid += cc;
 732                                         return (EIO);
 733                                 }
 734                         }
 735                         if (cc > 0) {
 736                                 cc = b_to_q((char *)cp, cc, &tp->t_canq);
 737                                 /*
 738                                  * XXX we don't guarantee that the canq size
 739                                  * is >= TTYHOG, so the above b_to_q() may
 740                                  * leave some bytes uncopied.  However, space
 741                                  * is guaranteed for the null terminator if
 742                                  * we don't fail here since (TTYHOG - 1) is
 743                                  * not a multiple of CBSIZE.
 744                                  */
 745                                 if (cc > 0)
 746                                         break;
 747                         }
 748                 }
 749                 /* adjust for data copied in but not written */
 750                 ap->a_uio->uio_resid += cc;
 751                 clist_putc(0, &tp->t_canq);
 752                 ttwakeup(tp);
 753                 wakeup(TSA_PTS_READ(tp));
 754                 return (0);
 755         }
 756         while (ap->a_uio->uio_resid > 0 || cc > 0) {
 757                 if (cc == 0) {
 758                         cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
 759                         cp = locbuf;
 760                         error = uiomove(cp, (size_t)cc, ap->a_uio);
 761                         if (error)
 762                                 return (error);
 763                         /* check again for safety */
 764                         if ((tp->t_state & TS_ISOPEN) == 0) {
 765                                 /* adjust for data copied in but not written */
 766                                 ap->a_uio->uio_resid += cc;
 767                                 return (EIO);
 768                         }
 769                 }
 770                 while (cc > 0) {
 771                         if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
 772                            (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
 773                                 wakeup(TSA_HUP_OR_INPUT(tp));
 774                                 goto block;
 775                         }
 776                         (*linesw[tp->t_line].l_rint)(*cp++, tp);
 777                         cnt++;
 778                         cc--;
 779                 }
 780                 cc = 0;
 781         }
 782         return (0);
 783 block:
 784         /*
 785          * Come here to wait for slave to open, for space
 786          * in outq, or space in rawq, or an empty canq.
 787          */
 788         if ((tp->t_state & TS_CONNECTED) == 0) {
 789                 /* adjust for data copied in but not written */
 790                 ap->a_uio->uio_resid += cc;
 791                 return (EIO);
 792         }
 793         if (ap->a_ioflag & IO_NDELAY) {
 794                 /* adjust for data copied in but not written */
 795                 ap->a_uio->uio_resid += cc;
 796                 if (cnt == 0)
 797                         return (EWOULDBLOCK);
 798                 return (0);
 799         }
 800         error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
 801         if (error) {
 802                 /* adjust for data copied in but not written */
 803                 ap->a_uio->uio_resid += cc;
 804                 return (error);
 805         }
 806         goto again;
 807 }
 808
 809 /*ARGSUSED*/
 810 static  int
 811 ptyioctl(struct dev_ioctl_args *ap)
 812 {
 813         cdev_t dev = ap->a_head.a_dev;
 814         struct tty *tp = dev->si_tty;
 815         struct pt_ioctl *pti = dev->si_drv1;
 816         u_char *cc = tp->t_cc;
 817         int stop, error;
 818
 819         if (dev_dflags(dev) & D_MASTER) {
 820                 switch (ap->a_cmd) {
 821
 822                 case TIOCGPGRP:
 823                         /*
 824                          * We avoid calling ttioctl on the controller since,
 825                          * in that case, tp must be the controlling terminal.
 826                          */
 827                         *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
 828                         return (0);
 829
 830                 case TIOCPKT:
 831                         if (*(int *)ap->a_data) {
 832                                 if (pti->pt_flags & PF_UCNTL)
 833                                         return (EINVAL);
 834                                 pti->pt_flags |= PF_PKT;
 835                         } else
 836                                 pti->pt_flags &= ~PF_PKT;
 837                         return (0);
 838
 839                 case TIOCUCNTL:
 840                         if (*(int *)ap->a_data) {
 841                                 if (pti->pt_flags & PF_PKT)
 842                                         return (EINVAL);
 843                                 pti->pt_flags |= PF_UCNTL;
 844                         } else
 845                                 pti->pt_flags &= ~PF_UCNTL;
 846                         return (0);
 847
 848                 case TIOCREMOTE:
 849                         if (*(int *)ap->a_data)
 850                                 pti->pt_flags |= PF_REMOTE;
 851                         else
 852                                 pti->pt_flags &= ~PF_REMOTE;
 853                         ttyflush(tp, FREAD|FWRITE);
 854                         return (0);
 855
 856                 case TIOCISPTMASTER:
 857                         if ((pti->pt_flags2 & PF_UNIX98) && (pti->devc == dev))
 858                                 return (0);
 859                         else
 860                                 return (EINVAL);
 861                 }
 862
 863                 /*
 864                  * The rest of the ioctls shouldn't be called until
 865                  * the slave is open.
 866                  */
 867                 if ((tp->t_state & TS_ISOPEN) == 0)
 868                         return (EAGAIN);
 869
 870                 switch (ap->a_cmd) {
 871 #ifdef COMPAT_43
 872                 case TIOCSETP:
 873                 case TIOCSETN:
 874 #endif
 875                 case TIOCSETD:
 876                 case TIOCSETA:
 877                 case TIOCSETAW:
 878                 case TIOCSETAF:
 879                         /*
 880                          * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
 881                          * ttywflush(tp) will hang if there are characters in
 882                          * the outq.
 883                          */
 884                         ndflush(&tp->t_outq, tp->t_outq.c_cc);
 885                         break;
 886
 887                 case TIOCSIG:
 888                         if (*(unsigned int *)ap->a_data >= NSIG ||
 889                             *(unsigned int *)ap->a_data == 0)
 890                                 return(EINVAL);
 891                         if ((tp->t_lflag&NOFLSH) == 0)
 892                                 ttyflush(tp, FREAD|FWRITE);
 893                         pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1);
 894                         if ((*(unsigned int *)ap->a_data == SIGINFO) &&
 895                             ((tp->t_lflag&NOKERNINFO) == 0))
 896                                 ttyinfo(tp);
 897                         return(0);
 898                 }
 899         }
 900         if (ap->a_cmd == TIOCEXT) {
 901                 /*
 902                  * When the EXTPROC bit is being toggled, we need
 903                  * to send an TIOCPKT_IOCTL if the packet driver
 904                  * is turned on.
 905                  */
 906                 if (*(int *)ap->a_data) {
 907                         if (pti->pt_flags & PF_PKT) {
 908                                 pti->pt_send |= TIOCPKT_IOCTL;
 909                                 ptcwakeup(tp, FREAD);
 910                         }
 911                         tp->t_lflag |= EXTPROC;
 912                 } else {
 913                         if ((tp->t_lflag & EXTPROC) &&
 914                             (pti->pt_flags & PF_PKT)) {
 915                                 pti->pt_send |= TIOCPKT_IOCTL;
 916                                 ptcwakeup(tp, FREAD);
 917                         }
 918                         tp->t_lflag &= ~EXTPROC;
 919                 }
 920                 return(0);
 921         }
 922         error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
 923                                               ap->a_fflag, ap->a_cred);
 924         if (error == ENOIOCTL)
 925                  error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
 926         if (error == ENOIOCTL) {
 927                 if (pti->pt_flags & PF_UCNTL &&
 928                     (ap->a_cmd & ~0xff) == UIOCCMD(0)) {
 929                         if (ap->a_cmd & 0xff) {
 930                                 pti->pt_ucntl = (u_char)ap->a_cmd;
 931                                 ptcwakeup(tp, FREAD);
 932                         }
 933                         return (0);
 934                 }
 935                 error = ENOTTY;
 936         }
 937         /*
 938          * If external processing and packet mode send ioctl packet.
 939          */
 940         if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
 941                 switch(ap->a_cmd) {
 942                 case TIOCSETA:
 943                 case TIOCSETAW:
 944                 case TIOCSETAF:
 945 #ifdef COMPAT_43
 946                 case TIOCSETP:
 947                 case TIOCSETN:
 948 #endif
 949 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
 950                 case TIOCSETC:
 951                 case TIOCSLTC:
 952                 case TIOCLBIS:
 953                 case TIOCLBIC:
 954                 case TIOCLSET:
 955 #endif
 956                         pti->pt_send |= TIOCPKT_IOCTL;
 957                         ptcwakeup(tp, FREAD);
 958                 default:
 959                         break;
 960                 }
 961         }
 962         stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
 963                 && CCEQ(cc[VSTART], CTRL('q'));
 964         if (pti->pt_flags & PF_NOSTOP) {
 965                 if (stop) {
 966                         pti->pt_send &= ~TIOCPKT_NOSTOP;
 967                         pti->pt_send |= TIOCPKT_DOSTOP;
 968                         pti->pt_flags &= ~PF_NOSTOP;
 969                         ptcwakeup(tp, FREAD);
 970                 }
 971         } else {
 972                 if (!stop) {
 973                         pti->pt_send &= ~TIOCPKT_DOSTOP;
 974                         pti->pt_send |= TIOCPKT_NOSTOP;
 975                         pti->pt_flags |= PF_NOSTOP;
 976                         ptcwakeup(tp, FREAD);
 977                 }
 978         }
 979         return (error);
 980 }
 981
 982
 983 static void ptc_drvinit (void *unused);
 984
 985 #ifdef UNIX98_PTYS
 986 SYSCTL_INT(_kern, OID_AUTO, pty_debug, CTLFLAG_RW, &pty_debug_level,
 987                 0, "Change pty debug level");
 988 #endif
 989
 990 static void
 991 ptc_drvinit(void *unused)
 992 {
 993         int i;
 994
 995 #ifdef UNIX98_PTYS
 996         /*
 997          * Unix98 pty stuff.
 998          * Create the clonable base device.
 999          */
1000         make_autoclone_dev(&ptc_ops, &DEVFS_CLONE_BITMAP(pty), ptyclone,
1001             0, 0, 0666, "ptmx");
1002 #endif
1003
1004         for (i = 0; i < 256; i++) {
1005                 ptyinit(i);
1006         }
1007 }
1008
1009 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)