1 /* 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 34 * $FreeBSD: src/sys/kern/tty_pty.c,v 1.74.2.4 2002/02/20 19:58:13 dillon Exp $ 35 * $DragonFly: src/sys/kern/tty_pty.c,v 1.21 2008/08/13 10:29:38 swildner Exp $ 36 */ 37 38 /* 39 * Pseudo-teletype Driver 40 * (Actually two drivers, requiring two dev_ops structures) 41 */ 42 #include "use_pty.h" /* XXX */ 43 #include "opt_compat.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 48 #include <sys/ioctl_compat.h> 49 #endif 50 #include <sys/proc.h> 51 #include <sys/priv.h> 52 #include <sys/tty.h> 53 #include <sys/conf.h> 54 #include <sys/fcntl.h> 55 #include <sys/poll.h> 56 #include <sys/kernel.h> 57 #include <sys/vnode.h> 58 #include <sys/signalvar.h> 59 #include <sys/malloc.h> 60 #include <sys/device.h> 61 #include <sys/thread2.h> 62 63 MALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); 64 65 static void ptsstart (struct tty *tp); 66 static void ptsstop (struct tty *tp, int rw); 67 static void ptcwakeup (struct tty *tp, int flag); 68 static void ptyinit (int n); 69 70 static d_open_t ptsopen; 71 static d_close_t ptsclose; 72 static d_read_t ptsread; 73 static d_write_t ptswrite; 74 static d_ioctl_t ptyioctl; 75 static d_open_t ptcopen; 76 static d_close_t ptcclose; 77 static d_read_t ptcread; 78 static d_write_t ptcwrite; 79 static d_poll_t ptcpoll; 80 81 #define CDEV_MAJOR_S 5 82 static struct dev_ops pts_ops = { 83 { "pts", CDEV_MAJOR_S, D_TTY | D_KQFILTER }, 84 .d_open = ptsopen, 85 .d_close = ptsclose, 86 .d_read = ptsread, 87 .d_write = ptswrite, 88 .d_ioctl = ptyioctl, 89 .d_poll = ttypoll, 90 .d_kqfilter = ttykqfilter, 91 .d_revoke = ttyrevoke 92 }; 93 94 #define CDEV_MAJOR_C 6 95 static struct dev_ops ptc_ops = { 96 { "ptc", CDEV_MAJOR_C, D_TTY | D_KQFILTER | D_MASTER }, 97 .d_open = ptcopen, 98 .d_close = ptcclose, 99 .d_read = ptcread, 100 .d_write = ptcwrite, 101 .d_ioctl = ptyioctl, 102 .d_poll = ptcpoll, 103 .d_kqfilter = ttykqfilter, 104 .d_revoke = ttyrevoke 105 }; 106 107 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 108 109 struct pt_ioctl { 110 int pt_flags; 111 struct selinfo pt_selr, pt_selw; 112 u_char pt_send; 113 u_char pt_ucntl; 114 struct tty pt_tty; 115 cdev_t devs, devc; 116 struct prison *pt_prison; 117 }; 118 119 #define PF_PKT 0x08 /* packet mode */ 120 #define PF_STOPPED 0x10 /* user told stopped */ 121 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 122 #define PF_NOSTOP 0x40 123 #define PF_UCNTL 0x80 /* user control mode */ 124 125 /* 126 * This function creates and initializes a pts/ptc pair 127 * 128 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 129 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 130 * 131 * XXX: define and add mapping of upper minor bits to allow more 132 * than 256 ptys. 133 */ 134 static void 135 ptyinit(int n) 136 { 137 cdev_t devs, devc; 138 char *names = "pqrsPQRS"; 139 struct pt_ioctl *pt; 140 141 /* For now we only map the lower 8 bits of the minor */ 142 if (n & ~0xff) 143 return; 144 145 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); 146 pt->devs = devs = make_dev(&pts_ops, n, 147 0, 0, 0666, "tty%c%r", names[n / 32], n % 32); 148 pt->devc = devc = make_dev(&ptc_ops, n, 149 0, 0, 0666, "pty%c%r", names[n / 32], n % 32); 150 151 devs->si_drv1 = devc->si_drv1 = pt; 152 devs->si_tty = devc->si_tty = &pt->pt_tty; 153 pt->pt_tty.t_dev = devs; 154 ttyregister(&pt->pt_tty); 155 } 156 157 /*ARGSUSED*/ 158 static int 159 ptsopen(struct dev_open_args *ap) 160 { 161 cdev_t dev = ap->a_head.a_dev; 162 struct tty *tp; 163 int error; 164 #if 0 165 int minr; 166 cdev_t nextdev; 167 #endif 168 struct pt_ioctl *pti; 169 170 #if 0 171 minr = lminor(dev); 172 /* 173 * REMOVED gross hack for devfs. also note that makedev() 174 * no longer exists in this form and reference counting makes 175 * this a problem if we don't clean it out later. 176 */ 177 if (minr < 255) { 178 nextdev = make_sub_dev(dev, minr + 1); 179 if (!nextdev->si_drv1) { 180 ptyinit(minr + 1); 181 } 182 } 183 #endif 184 if (!dev->si_drv1) 185 ptyinit(minor(dev)); 186 if (!dev->si_drv1) 187 return(ENXIO); 188 pti = dev->si_drv1; 189 tp = dev->si_tty; 190 if ((tp->t_state & TS_ISOPEN) == 0) { 191 ttychars(tp); /* Set up default chars */ 192 tp->t_iflag = TTYDEF_IFLAG; 193 tp->t_oflag = TTYDEF_OFLAG; 194 tp->t_lflag = TTYDEF_LFLAG; 195 tp->t_cflag = TTYDEF_CFLAG; 196 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 197 } else if ((tp->t_state & TS_XCLUDE) && priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) { 198 return (EBUSY); 199 } else if (pti->pt_prison != ap->a_cred->cr_prison) { 200 return (EBUSY); 201 } 202 if (tp->t_oproc) /* Ctrlr still around. */ 203 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 204 while ((tp->t_state & TS_CARR_ON) == 0) { 205 if (ap->a_oflags & FNONBLOCK) 206 break; 207 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0); 208 if (error) 209 return (error); 210 } 211 error = (*linesw[tp->t_line].l_open)(dev, tp); 212 if (error == 0) 213 ptcwakeup(tp, FREAD|FWRITE); 214 return (error); 215 } 216 217 static int 218 ptsclose(struct dev_close_args *ap) 219 { 220 cdev_t dev = ap->a_head.a_dev; 221 struct tty *tp; 222 int err; 223 224 tp = dev->si_tty; 225 err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag); 226 ptsstop(tp, FREAD|FWRITE); 227 (void) ttyclose(tp); 228 return (err); 229 } 230 231 static int 232 ptsread(struct dev_read_args *ap) 233 { 234 cdev_t dev = ap->a_head.a_dev; 235 struct proc *p = curproc; 236 struct tty *tp = dev->si_tty; 237 struct pt_ioctl *pti = dev->si_drv1; 238 struct lwp *lp; 239 240 int error = 0; 241 242 lp = curthread->td_lwp; 243 244 again: 245 if (pti->pt_flags & PF_REMOTE) { 246 while (isbackground(p, tp)) { 247 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || 248 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) || 249 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) 250 return (EIO); 251 pgsignal(p->p_pgrp, SIGTTIN, 1); 252 error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0); 253 if (error) 254 return (error); 255 } 256 if (tp->t_canq.c_cc == 0) { 257 if (ap->a_ioflag & IO_NDELAY) 258 return (EWOULDBLOCK); 259 error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH, 260 "ptsin", 0); 261 if (error) 262 return (error); 263 goto again; 264 } 265 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0) 266 if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) { 267 error = EFAULT; 268 break; 269 } 270 if (tp->t_canq.c_cc == 1) 271 clist_getc(&tp->t_canq); 272 if (tp->t_canq.c_cc) 273 return (error); 274 } else 275 if (tp->t_oproc) 276 error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag); 277 ptcwakeup(tp, FWRITE); 278 return (error); 279 } 280 281 /* 282 * Write to pseudo-tty. 283 * Wakeups of controlling tty will happen 284 * indirectly, when tty driver calls ptsstart. 285 */ 286 static int 287 ptswrite(struct dev_write_args *ap) 288 { 289 cdev_t dev = ap->a_head.a_dev; 290 struct tty *tp; 291 292 tp = dev->si_tty; 293 if (tp->t_oproc == 0) 294 return (EIO); 295 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag)); 296 } 297 298 /* 299 * Start output on pseudo-tty. 300 * Wake up process selecting or sleeping for input from controlling tty. 301 */ 302 static void 303 ptsstart(struct tty *tp) 304 { 305 struct pt_ioctl *pti = tp->t_dev->si_drv1; 306 307 if (tp->t_state & TS_TTSTOP) 308 return; 309 if (pti->pt_flags & PF_STOPPED) { 310 pti->pt_flags &= ~PF_STOPPED; 311 pti->pt_send = TIOCPKT_START; 312 } 313 ptcwakeup(tp, FREAD); 314 } 315 316 static void 317 ptcwakeup(struct tty *tp, int flag) 318 { 319 struct pt_ioctl *pti = tp->t_dev->si_drv1; 320 321 if (flag & FREAD) { 322 selwakeup(&pti->pt_selr); 323 wakeup(TSA_PTC_READ(tp)); 324 } 325 if (flag & FWRITE) { 326 selwakeup(&pti->pt_selw); 327 wakeup(TSA_PTC_WRITE(tp)); 328 } 329 } 330 331 static int 332 ptcopen(struct dev_open_args *ap) 333 { 334 cdev_t dev = ap->a_head.a_dev; 335 struct tty *tp; 336 struct pt_ioctl *pti; 337 338 if (!dev->si_drv1) 339 ptyinit(minor(dev)); 340 if (!dev->si_drv1) 341 return(ENXIO); 342 tp = dev->si_tty; 343 if (tp->t_oproc) 344 return (EIO); 345 tp->t_oproc = ptsstart; 346 tp->t_stop = ptsstop; 347 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 348 tp->t_lflag &= ~EXTPROC; 349 pti = dev->si_drv1; 350 pti->pt_prison = ap->a_cred->cr_prison; 351 pti->pt_flags = 0; 352 pti->pt_send = 0; 353 pti->pt_ucntl = 0; 354 pti->devs->si_uid = ap->a_cred->cr_uid; 355 return (0); 356 } 357 358 static int 359 ptcclose(struct dev_close_args *ap) 360 { 361 cdev_t dev = ap->a_head.a_dev; 362 struct tty *tp; 363 364 tp = dev->si_tty; 365 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 366 367 /* 368 * XXX MDMBUF makes no sense for ptys but would inhibit the above 369 * l_modem(). CLOCAL makes sense but isn't supported. Special 370 * l_modem()s that ignore carrier drop make no sense for ptys but 371 * may be in use because other parts of the line discipline make 372 * sense for ptys. Recover by doing everything that a normal 373 * ttymodem() would have done except for sending a SIGHUP. 374 */ 375 if (tp->t_state & TS_ISOPEN) { 376 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 377 tp->t_state |= TS_ZOMBIE; 378 ttyflush(tp, FREAD | FWRITE); 379 tp->t_dev->si_uid = 0; 380 } 381 382 tp->t_oproc = 0; /* mark closed */ 383 return (0); 384 } 385 386 static int 387 ptcread(struct dev_read_args *ap) 388 { 389 cdev_t dev = ap->a_head.a_dev; 390 struct tty *tp = dev->si_tty; 391 struct pt_ioctl *pti = dev->si_drv1; 392 char buf[BUFSIZ]; 393 int error = 0, cc; 394 395 /* 396 * We want to block until the slave 397 * is open, and there's something to read; 398 * but if we lost the slave or we're NBIO, 399 * then return the appropriate error instead. 400 */ 401 for (;;) { 402 if (tp->t_state&TS_ISOPEN) { 403 if (pti->pt_flags&PF_PKT && pti->pt_send) { 404 error = ureadc((int)pti->pt_send, ap->a_uio); 405 if (error) 406 return (error); 407 if (pti->pt_send & TIOCPKT_IOCTL) { 408 cc = min(ap->a_uio->uio_resid, 409 sizeof(tp->t_termios)); 410 uiomove((caddr_t)&tp->t_termios, cc, 411 ap->a_uio); 412 } 413 pti->pt_send = 0; 414 return (0); 415 } 416 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 417 error = ureadc((int)pti->pt_ucntl, ap->a_uio); 418 if (error) 419 return (error); 420 pti->pt_ucntl = 0; 421 return (0); 422 } 423 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 424 break; 425 } 426 if ((tp->t_state & TS_CONNECTED) == 0) 427 return (0); /* EOF */ 428 if (ap->a_ioflag & IO_NDELAY) 429 return (EWOULDBLOCK); 430 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0); 431 if (error) 432 return (error); 433 } 434 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 435 error = ureadc(0, ap->a_uio); 436 while (ap->a_uio->uio_resid > 0 && error == 0) { 437 cc = q_to_b(&tp->t_outq, buf, min(ap->a_uio->uio_resid, BUFSIZ)); 438 if (cc <= 0) 439 break; 440 error = uiomove(buf, cc, ap->a_uio); 441 } 442 ttwwakeup(tp); 443 return (error); 444 } 445 446 static void 447 ptsstop(struct tty *tp, int flush) 448 { 449 struct pt_ioctl *pti = tp->t_dev->si_drv1; 450 int flag; 451 452 /* note: FLUSHREAD and FLUSHWRITE already ok */ 453 if (flush == 0) { 454 flush = TIOCPKT_STOP; 455 pti->pt_flags |= PF_STOPPED; 456 } else 457 pti->pt_flags &= ~PF_STOPPED; 458 pti->pt_send |= flush; 459 /* change of perspective */ 460 flag = 0; 461 if (flush & FREAD) 462 flag |= FWRITE; 463 if (flush & FWRITE) 464 flag |= FREAD; 465 ptcwakeup(tp, flag); 466 } 467 468 static int 469 ptcpoll(struct dev_poll_args *ap) 470 { 471 cdev_t dev = ap->a_head.a_dev; 472 struct tty *tp = dev->si_tty; 473 struct pt_ioctl *pti = dev->si_drv1; 474 int revents = 0; 475 476 if ((tp->t_state & TS_CONNECTED) == 0) { 477 ap->a_events = seltrue(dev, ap->a_events) | POLLHUP; 478 return(0); 479 } 480 481 /* 482 * Need to block timeouts (ttrstart). 483 */ 484 crit_enter(); 485 486 if (ap->a_events & (POLLIN | POLLRDNORM)) 487 if ((tp->t_state & TS_ISOPEN) && 488 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 489 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 490 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 491 revents |= ap->a_events & (POLLIN | POLLRDNORM); 492 493 if (ap->a_events & (POLLOUT | POLLWRNORM)) 494 if (tp->t_state & TS_ISOPEN && 495 ((pti->pt_flags & PF_REMOTE) ? 496 (tp->t_canq.c_cc == 0) : 497 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 498 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) 499 revents |= ap->a_events & (POLLOUT | POLLWRNORM); 500 501 if (ap->a_events & POLLHUP) 502 if ((tp->t_state & TS_CARR_ON) == 0) 503 revents |= POLLHUP; 504 505 if (revents == 0) { 506 if (ap->a_events & (POLLIN | POLLRDNORM)) 507 selrecord(curthread, &pti->pt_selr); 508 509 if (ap->a_events & (POLLOUT | POLLWRNORM)) 510 selrecord(curthread, &pti->pt_selw); 511 } 512 crit_exit(); 513 514 ap->a_events = revents; 515 return (0); 516 } 517 518 static int 519 ptcwrite(struct dev_write_args *ap) 520 { 521 cdev_t dev = ap->a_head.a_dev; 522 struct tty *tp = dev->si_tty; 523 u_char *cp = 0; 524 int cc = 0; 525 u_char locbuf[BUFSIZ]; 526 int cnt = 0; 527 struct pt_ioctl *pti = dev->si_drv1; 528 int error = 0; 529 530 again: 531 if ((tp->t_state&TS_ISOPEN) == 0) 532 goto block; 533 if (pti->pt_flags & PF_REMOTE) { 534 if (tp->t_canq.c_cc) 535 goto block; 536 while ((ap->a_uio->uio_resid > 0 || cc > 0) && 537 tp->t_canq.c_cc < TTYHOG - 1) { 538 if (cc == 0) { 539 cc = min(ap->a_uio->uio_resid, BUFSIZ); 540 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 541 cp = locbuf; 542 error = uiomove((caddr_t)cp, cc, ap->a_uio); 543 if (error) 544 return (error); 545 /* check again for safety */ 546 if ((tp->t_state & TS_ISOPEN) == 0) { 547 /* adjust as usual */ 548 ap->a_uio->uio_resid += cc; 549 return (EIO); 550 } 551 } 552 if (cc > 0) { 553 cc = b_to_q((char *)cp, cc, &tp->t_canq); 554 /* 555 * XXX we don't guarantee that the canq size 556 * is >= TTYHOG, so the above b_to_q() may 557 * leave some bytes uncopied. However, space 558 * is guaranteed for the null terminator if 559 * we don't fail here since (TTYHOG - 1) is 560 * not a multiple of CBSIZE. 561 */ 562 if (cc > 0) 563 break; 564 } 565 } 566 /* adjust for data copied in but not written */ 567 ap->a_uio->uio_resid += cc; 568 clist_putc(0, &tp->t_canq); 569 ttwakeup(tp); 570 wakeup(TSA_PTS_READ(tp)); 571 return (0); 572 } 573 while (ap->a_uio->uio_resid > 0 || cc > 0) { 574 if (cc == 0) { 575 cc = min(ap->a_uio->uio_resid, BUFSIZ); 576 cp = locbuf; 577 error = uiomove((caddr_t)cp, cc, ap->a_uio); 578 if (error) 579 return (error); 580 /* check again for safety */ 581 if ((tp->t_state & TS_ISOPEN) == 0) { 582 /* adjust for data copied in but not written */ 583 ap->a_uio->uio_resid += cc; 584 return (EIO); 585 } 586 } 587 while (cc > 0) { 588 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 589 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { 590 wakeup(TSA_HUP_OR_INPUT(tp)); 591 goto block; 592 } 593 (*linesw[tp->t_line].l_rint)(*cp++, tp); 594 cnt++; 595 cc--; 596 } 597 cc = 0; 598 } 599 return (0); 600 block: 601 /* 602 * Come here to wait for slave to open, for space 603 * in outq, or space in rawq, or an empty canq. 604 */ 605 if ((tp->t_state & TS_CONNECTED) == 0) { 606 /* adjust for data copied in but not written */ 607 ap->a_uio->uio_resid += cc; 608 return (EIO); 609 } 610 if (ap->a_ioflag & IO_NDELAY) { 611 /* adjust for data copied in but not written */ 612 ap->a_uio->uio_resid += cc; 613 if (cnt == 0) 614 return (EWOULDBLOCK); 615 return (0); 616 } 617 error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0); 618 if (error) { 619 /* adjust for data copied in but not written */ 620 ap->a_uio->uio_resid += cc; 621 return (error); 622 } 623 goto again; 624 } 625 626 /*ARGSUSED*/ 627 static int 628 ptyioctl(struct dev_ioctl_args *ap) 629 { 630 cdev_t dev = ap->a_head.a_dev; 631 struct tty *tp = dev->si_tty; 632 struct pt_ioctl *pti = dev->si_drv1; 633 u_char *cc = tp->t_cc; 634 int stop, error; 635 636 if (dev_dflags(dev) & D_MASTER) { 637 switch (ap->a_cmd) { 638 639 case TIOCGPGRP: 640 /* 641 * We avoid calling ttioctl on the controller since, 642 * in that case, tp must be the controlling terminal. 643 */ 644 *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 645 return (0); 646 647 case TIOCPKT: 648 if (*(int *)ap->a_data) { 649 if (pti->pt_flags & PF_UCNTL) 650 return (EINVAL); 651 pti->pt_flags |= PF_PKT; 652 } else 653 pti->pt_flags &= ~PF_PKT; 654 return (0); 655 656 case TIOCUCNTL: 657 if (*(int *)ap->a_data) { 658 if (pti->pt_flags & PF_PKT) 659 return (EINVAL); 660 pti->pt_flags |= PF_UCNTL; 661 } else 662 pti->pt_flags &= ~PF_UCNTL; 663 return (0); 664 665 case TIOCREMOTE: 666 if (*(int *)ap->a_data) 667 pti->pt_flags |= PF_REMOTE; 668 else 669 pti->pt_flags &= ~PF_REMOTE; 670 ttyflush(tp, FREAD|FWRITE); 671 return (0); 672 } 673 674 /* 675 * The rest of the ioctls shouldn't be called until 676 * the slave is open. 677 */ 678 if ((tp->t_state & TS_ISOPEN) == 0) 679 return (EAGAIN); 680 681 switch (ap->a_cmd) { 682 #ifdef COMPAT_43 683 case TIOCSETP: 684 case TIOCSETN: 685 #endif 686 case TIOCSETD: 687 case TIOCSETA: 688 case TIOCSETAW: 689 case TIOCSETAF: 690 /* 691 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 692 * ttywflush(tp) will hang if there are characters in 693 * the outq. 694 */ 695 ndflush(&tp->t_outq, tp->t_outq.c_cc); 696 break; 697 698 case TIOCSIG: 699 if (*(unsigned int *)ap->a_data >= NSIG || 700 *(unsigned int *)ap->a_data == 0) 701 return(EINVAL); 702 if ((tp->t_lflag&NOFLSH) == 0) 703 ttyflush(tp, FREAD|FWRITE); 704 pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1); 705 if ((*(unsigned int *)ap->a_data == SIGINFO) && 706 ((tp->t_lflag&NOKERNINFO) == 0)) 707 ttyinfo(tp); 708 return(0); 709 } 710 } 711 if (ap->a_cmd == TIOCEXT) { 712 /* 713 * When the EXTPROC bit is being toggled, we need 714 * to send an TIOCPKT_IOCTL if the packet driver 715 * is turned on. 716 */ 717 if (*(int *)ap->a_data) { 718 if (pti->pt_flags & PF_PKT) { 719 pti->pt_send |= TIOCPKT_IOCTL; 720 ptcwakeup(tp, FREAD); 721 } 722 tp->t_lflag |= EXTPROC; 723 } else { 724 if ((tp->t_lflag & EXTPROC) && 725 (pti->pt_flags & PF_PKT)) { 726 pti->pt_send |= TIOCPKT_IOCTL; 727 ptcwakeup(tp, FREAD); 728 } 729 tp->t_lflag &= ~EXTPROC; 730 } 731 return(0); 732 } 733 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data, 734 ap->a_fflag, ap->a_cred); 735 if (error == ENOIOCTL) 736 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag); 737 if (error == ENOIOCTL) { 738 if (pti->pt_flags & PF_UCNTL && 739 (ap->a_cmd & ~0xff) == UIOCCMD(0)) { 740 if (ap->a_cmd & 0xff) { 741 pti->pt_ucntl = (u_char)ap->a_cmd; 742 ptcwakeup(tp, FREAD); 743 } 744 return (0); 745 } 746 error = ENOTTY; 747 } 748 /* 749 * If external processing and packet mode send ioctl packet. 750 */ 751 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 752 switch(ap->a_cmd) { 753 case TIOCSETA: 754 case TIOCSETAW: 755 case TIOCSETAF: 756 #ifdef COMPAT_43 757 case TIOCSETP: 758 case TIOCSETN: 759 #endif 760 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 761 case TIOCSETC: 762 case TIOCSLTC: 763 case TIOCLBIS: 764 case TIOCLBIC: 765 case TIOCLSET: 766 #endif 767 pti->pt_send |= TIOCPKT_IOCTL; 768 ptcwakeup(tp, FREAD); 769 default: 770 break; 771 } 772 } 773 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 774 && CCEQ(cc[VSTART], CTRL('q')); 775 if (pti->pt_flags & PF_NOSTOP) { 776 if (stop) { 777 pti->pt_send &= ~TIOCPKT_NOSTOP; 778 pti->pt_send |= TIOCPKT_DOSTOP; 779 pti->pt_flags &= ~PF_NOSTOP; 780 ptcwakeup(tp, FREAD); 781 } 782 } else { 783 if (!stop) { 784 pti->pt_send &= ~TIOCPKT_DOSTOP; 785 pti->pt_send |= TIOCPKT_NOSTOP; 786 pti->pt_flags |= PF_NOSTOP; 787 ptcwakeup(tp, FREAD); 788 } 789 } 790 return (error); 791 } 792 793 794 static void ptc_drvinit (void *unused); 795 796 static void 797 ptc_drvinit(void *unused) 798 { 799 dev_ops_add(&pts_ops, 0, 0); 800 dev_ops_add(&ptc_ops, 0, 0); 801 /* XXX: Gross hack for DEVFS */ 802 /* XXX: DEVFS is no more, should this be removed? */ 803 ptyinit(0); 804 } 805 806 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 807