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) 886