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 static int filt_ptcread (struct knote *kn, long hint); 75 static void filt_ptcrdetach (struct knote *kn); 76 static int filt_ptcwrite (struct knote *kn, long hint); 77 static void filt_ptcwdetach (struct knote *kn); 78 79 static d_open_t ptsopen; 80 static d_close_t ptsclose; 81 static d_read_t ptsread; 82 static d_write_t ptswrite; 83 static d_ioctl_t ptyioctl; 84 static d_open_t ptcopen; 85 static d_close_t ptcclose; 86 static d_read_t ptcread; 87 static d_write_t ptcwrite; 88 static d_poll_t ptcpoll; 89 static d_kqfilter_t ptckqfilter; 90 91 #ifdef UNIX98_PTYS 92 DEVFS_DECLARE_CLONE_BITMAP(pty); 93 94 static d_clone_t ptyclone; 95 96 static int pty_debug_level = 0; 97 98 static struct dev_ops pts98_ops = { 99 { "pts98", 0, D_TTY | D_KQFILTER }, 100 .d_open = ptsopen, 101 .d_close = ptsclose, 102 .d_read = ptsread, 103 .d_write = ptswrite, 104 .d_ioctl = ptyioctl, 105 .d_poll = ttypoll, 106 .d_kqfilter = ttykqfilter, 107 .d_revoke = ttyrevoke 108 }; 109 110 static struct dev_ops ptc98_ops = { 111 { "ptc98", 0, D_TTY | D_KQFILTER | D_MASTER }, 112 .d_open = ptcopen, 113 .d_close = ptcclose, 114 .d_read = ptcread, 115 .d_write = ptcwrite, 116 .d_ioctl = ptyioctl, 117 .d_poll = ptcpoll, 118 .d_kqfilter = ptckqfilter, 119 .d_revoke = ttyrevoke 120 }; 121 #endif 122 123 #define CDEV_MAJOR_S 5 124 static struct dev_ops pts_ops = { 125 { "pts", CDEV_MAJOR_S, D_TTY | D_KQFILTER }, 126 .d_open = ptsopen, 127 .d_close = ptsclose, 128 .d_read = ptsread, 129 .d_write = ptswrite, 130 .d_ioctl = ptyioctl, 131 .d_poll = ttypoll, 132 .d_kqfilter = ttykqfilter, 133 .d_revoke = ttyrevoke 134 }; 135 136 #define CDEV_MAJOR_C 6 137 static struct dev_ops ptc_ops = { 138 { "ptc", CDEV_MAJOR_C, D_TTY | D_KQFILTER | D_MASTER }, 139 .d_open = ptcopen, 140 .d_close = ptcclose, 141 .d_read = ptcread, 142 .d_write = ptcwrite, 143 .d_ioctl = ptyioctl, 144 .d_poll = ptcpoll, 145 .d_kqfilter = ptckqfilter, 146 .d_revoke = ttyrevoke 147 }; 148 149 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 150 151 struct pt_ioctl { 152 int pt_flags; 153 int pt_flags2; 154 struct selinfo pt_selr, pt_selw; 155 u_char pt_send; 156 u_char pt_ucntl; 157 struct tty pt_tty; 158 cdev_t devs, devc; 159 struct prison *pt_prison; 160 }; 161 162 #define PF_PKT 0x08 /* packet mode */ 163 #define PF_STOPPED 0x10 /* user told stopped */ 164 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 165 #define PF_NOSTOP 0x40 166 #define PF_UCNTL 0x80 /* user control mode */ 167 168 #define PF_UNIX98 0x01 169 #define PF_SOPEN 0x02 170 #define PF_MOPEN 0x04 171 172 static int 173 ptydebug(int level, char *fmt, ...) 174 { 175 __va_list ap; 176 177 __va_start(ap, fmt); 178 if (level <= pty_debug_level) 179 kvprintf(fmt, ap); 180 __va_end(ap); 181 182 return 0; 183 } 184 185 /* 186 * This function creates and initializes a pts/ptc pair 187 * 188 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 189 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 190 * 191 * XXX: define and add mapping of upper minor bits to allow more 192 * than 256 ptys. 193 */ 194 static void 195 ptyinit(int n) 196 { 197 cdev_t devs, devc; 198 char *names = "pqrsPQRS"; 199 struct pt_ioctl *pt; 200 201 /* For now we only map the lower 8 bits of the minor */ 202 if (n & ~0xff) 203 return; 204 205 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); 206 pt->devs = devs = make_dev(&pts_ops, n, 207 0, 0, 0666, "tty%c%r", names[n / 32], n % 32); 208 pt->devc = devc = make_dev(&ptc_ops, n, 209 0, 0, 0666, "pty%c%r", names[n / 32], n % 32); 210 211 devs->si_drv1 = devc->si_drv1 = pt; 212 devs->si_tty = devc->si_tty = &pt->pt_tty; 213 devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */ 214 devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */ 215 pt->pt_tty.t_dev = devs; 216 ttyregister(&pt->pt_tty); 217 } 218 219 #ifdef UNIX98_PTYS 220 static int 221 ptyclone(struct dev_clone_args *ap) 222 { 223 int unit; 224 struct pt_ioctl *pt; 225 226 /* 227 * Limit the number of unix98 pty (slave) devices to 1000, as 228 * the utmp(5) format only allows for 8 bytes for the tty, 229 * "pts/XXX". 230 * If this limit is reached, we don't clone and return error 231 * to devfs. 232 */ 233 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(pty), 1000); 234 235 if (unit < 0) { 236 ap->a_dev = NULL; 237 return 1; 238 } 239 240 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); 241 242 pt->devc = ap->a_dev = make_only_dev(&ptc98_ops, unit, ap->a_cred->cr_ruid, 243 0, 0600, "ptm/%d", unit); 244 pt->devs = make_dev(&pts98_ops, unit, ap->a_cred->cr_ruid, GID_TTY, 0620, 245 "pts/%d", unit); 246 247 pt->devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */ 248 pt->devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */ 249 250 pt->devs->si_drv1 = pt->devc->si_drv1 = pt; 251 pt->devs->si_tty = pt->devc->si_tty = &pt->pt_tty; 252 pt->pt_tty.t_dev = pt->devs; 253 pt->pt_flags2 |= PF_UNIX98; 254 255 ttyregister(&pt->pt_tty); 256 257 return 0; 258 } 259 #endif 260 261 /*ARGSUSED*/ 262 static int 263 ptsopen(struct dev_open_args *ap) 264 { 265 cdev_t dev = ap->a_head.a_dev; 266 struct tty *tp; 267 int error; 268 struct pt_ioctl *pti; 269 270 if (!dev->si_drv1) 271 ptyinit(minor(dev)); 272 if (!dev->si_drv1) 273 return(ENXIO); 274 pti = dev->si_drv1; 275 tp = dev->si_tty; 276 if ((tp->t_state & TS_ISOPEN) == 0) { 277 ttychars(tp); /* Set up default chars */ 278 tp->t_iflag = TTYDEF_IFLAG; 279 tp->t_oflag = TTYDEF_OFLAG; 280 tp->t_lflag = TTYDEF_LFLAG; 281 tp->t_cflag = TTYDEF_CFLAG; 282 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 283 } else if ((tp->t_state & TS_XCLUDE) && priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) { 284 return (EBUSY); 285 } else if (pti->pt_prison != ap->a_cred->cr_prison) { 286 return (EBUSY); 287 } 288 if (tp->t_oproc) /* Ctrlr still around. */ 289 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 290 while ((tp->t_state & TS_CARR_ON) == 0) { 291 if (ap->a_oflags & FNONBLOCK) 292 break; 293 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0); 294 if (error) 295 return (error); 296 } 297 error = (*linesw[tp->t_line].l_open)(dev, tp); 298 if (error == 0) 299 ptcwakeup(tp, FREAD|FWRITE); 300 301 #ifdef UNIX98_PTYS 302 /* 303 * Unix98 pty stuff. 304 * On open of the slave, we set the corresponding flag in the common 305 * struct. 306 */ 307 ptydebug(1, "ptsopen=%s | unix98? %s\n", dev->si_name, 308 (pti->pt_flags2 & PF_UNIX98)?"yes":"no"); 309 310 if ((!error) && (pti->pt_flags2 & PF_UNIX98)) { 311 pti->pt_flags2 |= PF_SOPEN; 312 } 313 #endif 314 315 return (error); 316 } 317 318 static int 319 ptsclose(struct dev_close_args *ap) 320 { 321 cdev_t dev = ap->a_head.a_dev; 322 struct tty *tp; 323 struct pt_ioctl *pti = dev->si_drv1; 324 int err; 325 326 tp = dev->si_tty; 327 err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag); 328 ptsstop(tp, FREAD|FWRITE); 329 (void) ttyclose(tp); 330 331 #ifdef UNIX98_PTYS 332 /* 333 * Unix98 pty stuff. 334 * On close of the slave, we unset the corresponding flag, and if the master 335 * isn't open anymore, we destroy the slave and unset the unit. 336 */ 337 ptydebug(1, "ptsclose=%s | unix98? %s\n", dev->si_name, 338 (pti->pt_flags2 & PF_UNIX98)?"yes":"no"); 339 340 if (pti->pt_flags2 & PF_UNIX98) { 341 pti->pt_flags2 &= ~PF_SOPEN; 342 KKASSERT((pti->pt_flags2 & PF_SOPEN) == 0); 343 ptydebug(1, "master open? %s\n", 344 (pti->pt_flags2 & PF_MOPEN)?"yes":"no"); 345 346 if (!(pti->pt_flags2 & PF_SOPEN) && !(pti->pt_flags2 & PF_MOPEN)) { 347 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty), dev->si_uminor); 348 destroy_dev(dev); 349 } 350 } 351 #endif 352 353 return (err); 354 } 355 356 static int 357 ptsread(struct dev_read_args *ap) 358 { 359 cdev_t dev = ap->a_head.a_dev; 360 struct proc *p = curproc; 361 struct tty *tp = dev->si_tty; 362 struct pt_ioctl *pti = dev->si_drv1; 363 struct lwp *lp; 364 365 int error = 0; 366 367 lp = curthread->td_lwp; 368 369 again: 370 if (pti->pt_flags & PF_REMOTE) { 371 while (isbackground(p, tp)) { 372 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || 373 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) || 374 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) 375 return (EIO); 376 pgsignal(p->p_pgrp, SIGTTIN, 1); 377 error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0); 378 if (error) 379 return (error); 380 } 381 if (tp->t_canq.c_cc == 0) { 382 if (ap->a_ioflag & IO_NDELAY) 383 return (EWOULDBLOCK); 384 error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH, 385 "ptsin", 0); 386 if (error) 387 return (error); 388 goto again; 389 } 390 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0) 391 if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) { 392 error = EFAULT; 393 break; 394 } 395 if (tp->t_canq.c_cc == 1) 396 clist_getc(&tp->t_canq); 397 if (tp->t_canq.c_cc) 398 return (error); 399 } else 400 if (tp->t_oproc) 401 error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag); 402 ptcwakeup(tp, FWRITE); 403 return (error); 404 } 405 406 /* 407 * Write to pseudo-tty. 408 * Wakeups of controlling tty will happen 409 * indirectly, when tty driver calls ptsstart. 410 */ 411 static int 412 ptswrite(struct dev_write_args *ap) 413 { 414 cdev_t dev = ap->a_head.a_dev; 415 struct tty *tp; 416 417 tp = dev->si_tty; 418 if (tp->t_oproc == 0) 419 return (EIO); 420 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag)); 421 } 422 423 /* 424 * Start output on pseudo-tty. 425 * Wake up process selecting or sleeping for input from controlling tty. 426 */ 427 static void 428 ptsstart(struct tty *tp) 429 { 430 struct pt_ioctl *pti = tp->t_dev->si_drv1; 431 432 if (tp->t_state & TS_TTSTOP) 433 return; 434 if (pti->pt_flags & PF_STOPPED) { 435 pti->pt_flags &= ~PF_STOPPED; 436 pti->pt_send = TIOCPKT_START; 437 } 438 ptcwakeup(tp, FREAD); 439 } 440 441 static void 442 ptcwakeup(struct tty *tp, int flag) 443 { 444 struct pt_ioctl *pti = tp->t_dev->si_drv1; 445 446 if (flag & FREAD) { 447 selwakeup(&pti->pt_selr); 448 wakeup(TSA_PTC_READ(tp)); 449 KNOTE(&tp->t_rsel.si_note, 0); 450 } 451 if (flag & FWRITE) { 452 selwakeup(&pti->pt_selw); 453 wakeup(TSA_PTC_WRITE(tp)); 454 KNOTE(&tp->t_wsel.si_note, 0); 455 } 456 } 457 458 static int 459 ptcopen(struct dev_open_args *ap) 460 { 461 cdev_t dev = ap->a_head.a_dev; 462 struct tty *tp; 463 struct pt_ioctl *pti; 464 465 if (!dev->si_drv1) 466 ptyinit(minor(dev)); 467 if (!dev->si_drv1) 468 return(ENXIO); 469 pti = dev->si_drv1; 470 if (pti->pt_prison && pti->pt_prison != ap->a_cred->cr_prison) 471 return(EBUSY); 472 tp = dev->si_tty; 473 if (tp->t_oproc) 474 return (EIO); 475 tp->t_oproc = ptsstart; 476 tp->t_stop = ptsstop; 477 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 478 tp->t_lflag &= ~EXTPROC; 479 pti->pt_prison = ap->a_cred->cr_prison; 480 pti->pt_flags = 0; 481 pti->pt_send = 0; 482 pti->pt_ucntl = 0; 483 484 pti->devs->si_uid = ap->a_cred->cr_uid; 485 pti->devs->si_gid = 0; 486 pti->devs->si_perms = 0600; 487 pti->devc->si_uid = ap->a_cred->cr_uid; 488 pti->devc->si_gid = 0; 489 pti->devc->si_perms = 0600; 490 491 #ifdef UNIX98_PTYS 492 /* 493 * Unix98 pty stuff. 494 * On open of the master, we set the corresponding flag in the common 495 * struct. 496 */ 497 ptydebug(1, "ptcopen=%s (master) | unix98? %s\n", dev->si_name, 498 (pti->pt_flags2 & PF_UNIX98)?"yes":"no"); 499 500 if (pti->pt_flags2 & PF_UNIX98) { 501 pti->pt_flags2 |= PF_MOPEN; 502 } 503 #endif 504 505 return (0); 506 } 507 508 static int 509 ptcclose(struct dev_close_args *ap) 510 { 511 cdev_t dev = ap->a_head.a_dev; 512 struct tty *tp; 513 struct pt_ioctl *pti = dev->si_drv1; 514 515 tp = dev->si_tty; 516 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 517 518 #ifdef UNIX98_PTYS 519 /* 520 * Unix98 pty stuff. 521 * On close of the master, we unset the corresponding flag in the common 522 * struct asap. 523 */ 524 pti->pt_flags2 &= ~PF_MOPEN; 525 #endif 526 527 /* 528 * XXX MDMBUF makes no sense for ptys but would inhibit the above 529 * l_modem(). CLOCAL makes sense but isn't supported. Special 530 * l_modem()s that ignore carrier drop make no sense for ptys but 531 * may be in use because other parts of the line discipline make 532 * sense for ptys. Recover by doing everything that a normal 533 * ttymodem() would have done except for sending a SIGHUP. 534 */ 535 if (tp->t_state & TS_ISOPEN) { 536 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 537 tp->t_state |= TS_ZOMBIE; 538 ttyflush(tp, FREAD | FWRITE); 539 } 540 tp->t_oproc = 0; /* mark closed */ 541 542 pti = dev->si_drv1; 543 pti->pt_prison = NULL; 544 pti->devs->si_uid = 0; 545 pti->devs->si_gid = 0; 546 pti->devs->si_perms = 0666; 547 pti->devc->si_uid = 0; 548 pti->devc->si_gid = 0; 549 pti->devc->si_perms = 0666; 550 551 #ifdef UNIX98_PTYS 552 /* 553 * Unix98 pty stuff. 554 * On close of the master, we destroy the master and, if no slaves are open, 555 * we destroy the slave device and unset the unit. 556 */ 557 ptydebug(1, "ptcclose=%s (master) | unix98? %s\n", dev->si_name, 558 (pti->pt_flags2 & PF_UNIX98)?"yes":"no"); 559 if (pti->pt_flags2 & PF_UNIX98) { 560 KKASSERT((pti->pt_flags2 & PF_MOPEN) == 0); 561 destroy_dev(dev); 562 pti->devc = NULL; 563 564 if (!(pti->pt_flags2 & PF_SOPEN)) { 565 ptydebug(1, "ptcclose: slaves are not open\n"); 566 destroy_dev(pti->devs); 567 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty), dev->si_uminor); 568 } 569 } 570 #endif 571 572 return (0); 573 } 574 575 static int 576 ptcread(struct dev_read_args *ap) 577 { 578 cdev_t dev = ap->a_head.a_dev; 579 struct tty *tp = dev->si_tty; 580 struct pt_ioctl *pti = dev->si_drv1; 581 char buf[BUFSIZ]; 582 int error = 0, cc; 583 584 /* 585 * We want to block until the slave 586 * is open, and there's something to read; 587 * but if we lost the slave or we're NBIO, 588 * then return the appropriate error instead. 589 */ 590 for (;;) { 591 if (tp->t_state&TS_ISOPEN) { 592 if (pti->pt_flags&PF_PKT && pti->pt_send) { 593 error = ureadc((int)pti->pt_send, ap->a_uio); 594 if (error) 595 return (error); 596 if (pti->pt_send & TIOCPKT_IOCTL) { 597 cc = (int)szmin(ap->a_uio->uio_resid, 598 sizeof(tp->t_termios)); 599 uiomove((caddr_t)&tp->t_termios, cc, 600 ap->a_uio); 601 } 602 pti->pt_send = 0; 603 return (0); 604 } 605 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 606 error = ureadc((int)pti->pt_ucntl, ap->a_uio); 607 if (error) 608 return (error); 609 pti->pt_ucntl = 0; 610 return (0); 611 } 612 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 613 break; 614 } 615 if ((tp->t_state & TS_CONNECTED) == 0) 616 return (0); /* EOF */ 617 if (ap->a_ioflag & IO_NDELAY) 618 return (EWOULDBLOCK); 619 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0); 620 if (error) 621 return (error); 622 } 623 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 624 error = ureadc(0, ap->a_uio); 625 while (ap->a_uio->uio_resid > 0 && error == 0) { 626 cc = q_to_b(&tp->t_outq, buf, 627 (int)szmin(ap->a_uio->uio_resid, BUFSIZ)); 628 if (cc <= 0) 629 break; 630 error = uiomove(buf, (size_t)cc, ap->a_uio); 631 } 632 ttwwakeup(tp); 633 return (error); 634 } 635 636 static void 637 ptsstop(struct tty *tp, int flush) 638 { 639 struct pt_ioctl *pti = tp->t_dev->si_drv1; 640 int flag; 641 642 /* note: FLUSHREAD and FLUSHWRITE already ok */ 643 if (flush == 0) { 644 flush = TIOCPKT_STOP; 645 pti->pt_flags |= PF_STOPPED; 646 } else 647 pti->pt_flags &= ~PF_STOPPED; 648 pti->pt_send |= flush; 649 /* change of perspective */ 650 flag = 0; 651 if (flush & FREAD) 652 flag |= FWRITE; 653 if (flush & FWRITE) 654 flag |= FREAD; 655 ptcwakeup(tp, flag); 656 } 657 658 static int 659 ptcpoll(struct dev_poll_args *ap) 660 { 661 cdev_t dev = ap->a_head.a_dev; 662 struct tty *tp = dev->si_tty; 663 struct pt_ioctl *pti = dev->si_drv1; 664 int revents = 0; 665 666 if ((tp->t_state & TS_CONNECTED) == 0) { 667 ap->a_events = seltrue(dev, ap->a_events) | POLLHUP; 668 return(0); 669 } 670 671 /* 672 * Need to block timeouts (ttrstart). 673 */ 674 crit_enter(); 675 676 if (ap->a_events & (POLLIN | POLLRDNORM)) 677 if ((tp->t_state & TS_ISOPEN) && 678 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 679 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 680 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 681 revents |= ap->a_events & (POLLIN | POLLRDNORM); 682 683 if (ap->a_events & (POLLOUT | POLLWRNORM)) 684 if (tp->t_state & TS_ISOPEN && 685 ((pti->pt_flags & PF_REMOTE) ? 686 (tp->t_canq.c_cc == 0) : 687 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 688 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) 689 revents |= ap->a_events & (POLLOUT | POLLWRNORM); 690 691 if (ap->a_events & POLLHUP) 692 if ((tp->t_state & TS_CARR_ON) == 0) 693 revents |= POLLHUP; 694 695 if (revents == 0) { 696 if (ap->a_events & (POLLIN | POLLRDNORM)) 697 selrecord(curthread, &pti->pt_selr); 698 699 if (ap->a_events & (POLLOUT | POLLWRNORM)) 700 selrecord(curthread, &pti->pt_selw); 701 } 702 crit_exit(); 703 704 ap->a_events = revents; 705 return (0); 706 } 707 708 /* 709 * kqueue ops for pseudo-terminals. 710 */ 711 static struct filterops ptcread_filtops = 712 { 1, NULL, filt_ptcrdetach, filt_ptcread }; 713 static struct filterops ptcwrite_filtops = 714 { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; 715 716 static int 717 ptckqfilter(struct dev_kqfilter_args *ap) 718 { 719 cdev_t dev = ap->a_head.a_dev; 720 struct knote *kn = ap->a_kn; 721 struct tty *tp = dev->si_tty; 722 struct klist *klist; 723 724 ap->a_result = 0; 725 switch (kn->kn_filter) { 726 case EVFILT_READ: 727 klist = &tp->t_rsel.si_note; 728 kn->kn_fop = &ptcread_filtops; 729 break; 730 case EVFILT_WRITE: 731 klist = &tp->t_wsel.si_note; 732 kn->kn_fop = &ptcwrite_filtops; 733 break; 734 default: 735 ap->a_result = 1; 736 return (0); 737 } 738 739 kn->kn_hook = (caddr_t)dev; 740 741 crit_enter(); 742 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 743 crit_exit(); 744 745 return (0); 746 } 747 748 static int 749 filt_ptcread (struct knote *kn, long hint) 750 { 751 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty; 752 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1; 753 754 if ((tp->t_state & TS_ISOPEN) && 755 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 756 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 757 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) { 758 kn->kn_data = tp->t_outq.c_cc; 759 return(1); 760 } else { 761 return(0); 762 } 763 } 764 765 static int 766 filt_ptcwrite (struct knote *kn, long hint) 767 { 768 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty; 769 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1; 770 771 if (tp->t_state & TS_ISOPEN && 772 ((pti->pt_flags & PF_REMOTE) ? 773 (tp->t_canq.c_cc == 0) : 774 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 775 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) { 776 kn->kn_data = tp->t_canq.c_cc + tp->t_rawq.c_cc; 777 return(1); 778 } else { 779 return(0); 780 } 781 } 782 783 static void 784 filt_ptcrdetach (struct knote *kn) 785 { 786 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty; 787 788 crit_enter(); 789 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext); 790 crit_exit(); 791 } 792 793 static void 794 filt_ptcwdetach (struct knote *kn) 795 { 796 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty; 797 798 crit_enter(); 799 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext); 800 crit_exit(); 801 } 802 803 /* 804 * I/O ops 805 */ 806 static int 807 ptcwrite(struct dev_write_args *ap) 808 { 809 cdev_t dev = ap->a_head.a_dev; 810 struct tty *tp = dev->si_tty; 811 u_char *cp = 0; 812 int cc = 0; 813 u_char locbuf[BUFSIZ]; 814 int cnt = 0; 815 struct pt_ioctl *pti = dev->si_drv1; 816 int error = 0; 817 818 again: 819 if ((tp->t_state&TS_ISOPEN) == 0) 820 goto block; 821 if (pti->pt_flags & PF_REMOTE) { 822 if (tp->t_canq.c_cc) 823 goto block; 824 while ((ap->a_uio->uio_resid > 0 || cc > 0) && 825 tp->t_canq.c_cc < TTYHOG - 1) { 826 if (cc == 0) { 827 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ); 828 cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc); 829 cp = locbuf; 830 error = uiomove(cp, (size_t)cc, ap->a_uio); 831 if (error) 832 return (error); 833 /* check again for safety */ 834 if ((tp->t_state & TS_ISOPEN) == 0) { 835 /* adjust as usual */ 836 ap->a_uio->uio_resid += cc; 837 return (EIO); 838 } 839 } 840 if (cc > 0) { 841 cc = b_to_q((char *)cp, cc, &tp->t_canq); 842 /* 843 * XXX we don't guarantee that the canq size 844 * is >= TTYHOG, so the above b_to_q() may 845 * leave some bytes uncopied. However, space 846 * is guaranteed for the null terminator if 847 * we don't fail here since (TTYHOG - 1) is 848 * not a multiple of CBSIZE. 849 */ 850 if (cc > 0) 851 break; 852 } 853 } 854 /* adjust for data copied in but not written */ 855 ap->a_uio->uio_resid += cc; 856 clist_putc(0, &tp->t_canq); 857 ttwakeup(tp); 858 wakeup(TSA_PTS_READ(tp)); 859 return (0); 860 } 861 while (ap->a_uio->uio_resid > 0 || cc > 0) { 862 if (cc == 0) { 863 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ); 864 cp = locbuf; 865 error = uiomove(cp, (size_t)cc, ap->a_uio); 866 if (error) 867 return (error); 868 /* check again for safety */ 869 if ((tp->t_state & TS_ISOPEN) == 0) { 870 /* adjust for data copied in but not written */ 871 ap->a_uio->uio_resid += cc; 872 return (EIO); 873 } 874 } 875 while (cc > 0) { 876 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 877 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { 878 wakeup(TSA_HUP_OR_INPUT(tp)); 879 goto block; 880 } 881 (*linesw[tp->t_line].l_rint)(*cp++, tp); 882 cnt++; 883 cc--; 884 } 885 cc = 0; 886 } 887 return (0); 888 block: 889 /* 890 * Come here to wait for slave to open, for space 891 * in outq, or space in rawq, or an empty canq. 892 */ 893 if ((tp->t_state & TS_CONNECTED) == 0) { 894 /* adjust for data copied in but not written */ 895 ap->a_uio->uio_resid += cc; 896 return (EIO); 897 } 898 if (ap->a_ioflag & IO_NDELAY) { 899 /* adjust for data copied in but not written */ 900 ap->a_uio->uio_resid += cc; 901 if (cnt == 0) 902 return (EWOULDBLOCK); 903 return (0); 904 } 905 error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0); 906 if (error) { 907 /* adjust for data copied in but not written */ 908 ap->a_uio->uio_resid += cc; 909 return (error); 910 } 911 goto again; 912 } 913 914 /*ARGSUSED*/ 915 static int 916 ptyioctl(struct dev_ioctl_args *ap) 917 { 918 cdev_t dev = ap->a_head.a_dev; 919 struct tty *tp = dev->si_tty; 920 struct pt_ioctl *pti = dev->si_drv1; 921 u_char *cc = tp->t_cc; 922 int stop, error; 923 924 if (dev_dflags(dev) & D_MASTER) { 925 switch (ap->a_cmd) { 926 927 case TIOCGPGRP: 928 /* 929 * We avoid calling ttioctl on the controller since, 930 * in that case, tp must be the controlling terminal. 931 */ 932 *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 933 return (0); 934 935 case TIOCPKT: 936 if (*(int *)ap->a_data) { 937 if (pti->pt_flags & PF_UCNTL) 938 return (EINVAL); 939 pti->pt_flags |= PF_PKT; 940 } else 941 pti->pt_flags &= ~PF_PKT; 942 return (0); 943 944 case TIOCUCNTL: 945 if (*(int *)ap->a_data) { 946 if (pti->pt_flags & PF_PKT) 947 return (EINVAL); 948 pti->pt_flags |= PF_UCNTL; 949 } else 950 pti->pt_flags &= ~PF_UCNTL; 951 return (0); 952 953 case TIOCREMOTE: 954 if (*(int *)ap->a_data) 955 pti->pt_flags |= PF_REMOTE; 956 else 957 pti->pt_flags &= ~PF_REMOTE; 958 ttyflush(tp, FREAD|FWRITE); 959 return (0); 960 961 case TIOCISPTMASTER: 962 if ((pti->pt_flags2 & PF_UNIX98) && (pti->devc == dev)) 963 return (0); 964 else 965 return (EINVAL); 966 } 967 968 /* 969 * The rest of the ioctls shouldn't be called until 970 * the slave is open. 971 */ 972 if ((tp->t_state & TS_ISOPEN) == 0) 973 return (EAGAIN); 974 975 switch (ap->a_cmd) { 976 #ifdef COMPAT_43 977 case TIOCSETP: 978 case TIOCSETN: 979 #endif 980 case TIOCSETD: 981 case TIOCSETA: 982 case TIOCSETAW: 983 case TIOCSETAF: 984 /* 985 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 986 * ttywflush(tp) will hang if there are characters in 987 * the outq. 988 */ 989 ndflush(&tp->t_outq, tp->t_outq.c_cc); 990 break; 991 992 case TIOCSIG: 993 if (*(unsigned int *)ap->a_data >= NSIG || 994 *(unsigned int *)ap->a_data == 0) 995 return(EINVAL); 996 if ((tp->t_lflag&NOFLSH) == 0) 997 ttyflush(tp, FREAD|FWRITE); 998 pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1); 999 if ((*(unsigned int *)ap->a_data == SIGINFO) && 1000 ((tp->t_lflag&NOKERNINFO) == 0)) 1001 ttyinfo(tp); 1002 return(0); 1003 } 1004 } 1005 if (ap->a_cmd == TIOCEXT) { 1006 /* 1007 * When the EXTPROC bit is being toggled, we need 1008 * to send an TIOCPKT_IOCTL if the packet driver 1009 * is turned on. 1010 */ 1011 if (*(int *)ap->a_data) { 1012 if (pti->pt_flags & PF_PKT) { 1013 pti->pt_send |= TIOCPKT_IOCTL; 1014 ptcwakeup(tp, FREAD); 1015 } 1016 tp->t_lflag |= EXTPROC; 1017 } else { 1018 if ((tp->t_lflag & EXTPROC) && 1019 (pti->pt_flags & PF_PKT)) { 1020 pti->pt_send |= TIOCPKT_IOCTL; 1021 ptcwakeup(tp, FREAD); 1022 } 1023 tp->t_lflag &= ~EXTPROC; 1024 } 1025 return(0); 1026 } 1027 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data, 1028 ap->a_fflag, ap->a_cred); 1029 if (error == ENOIOCTL) 1030 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag); 1031 if (error == ENOIOCTL) { 1032 if (pti->pt_flags & PF_UCNTL && 1033 (ap->a_cmd & ~0xff) == UIOCCMD(0)) { 1034 if (ap->a_cmd & 0xff) { 1035 pti->pt_ucntl = (u_char)ap->a_cmd; 1036 ptcwakeup(tp, FREAD); 1037 } 1038 return (0); 1039 } 1040 error = ENOTTY; 1041 } 1042 /* 1043 * If external processing and packet mode send ioctl packet. 1044 */ 1045 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 1046 switch(ap->a_cmd) { 1047 case TIOCSETA: 1048 case TIOCSETAW: 1049 case TIOCSETAF: 1050 #ifdef COMPAT_43 1051 case TIOCSETP: 1052 case TIOCSETN: 1053 #endif 1054 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1055 case TIOCSETC: 1056 case TIOCSLTC: 1057 case TIOCLBIS: 1058 case TIOCLBIC: 1059 case TIOCLSET: 1060 #endif 1061 pti->pt_send |= TIOCPKT_IOCTL; 1062 ptcwakeup(tp, FREAD); 1063 default: 1064 break; 1065 } 1066 } 1067 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 1068 && CCEQ(cc[VSTART], CTRL('q')); 1069 if (pti->pt_flags & PF_NOSTOP) { 1070 if (stop) { 1071 pti->pt_send &= ~TIOCPKT_NOSTOP; 1072 pti->pt_send |= TIOCPKT_DOSTOP; 1073 pti->pt_flags &= ~PF_NOSTOP; 1074 ptcwakeup(tp, FREAD); 1075 } 1076 } else { 1077 if (!stop) { 1078 pti->pt_send &= ~TIOCPKT_DOSTOP; 1079 pti->pt_send |= TIOCPKT_NOSTOP; 1080 pti->pt_flags |= PF_NOSTOP; 1081 ptcwakeup(tp, FREAD); 1082 } 1083 } 1084 return (error); 1085 } 1086 1087 1088 static void ptc_drvinit (void *unused); 1089 1090 #ifdef UNIX98_PTYS 1091 SYSCTL_INT(_kern, OID_AUTO, pty_debug, CTLFLAG_RW, &pty_debug_level, 1092 0, "Change pty debug level"); 1093 #endif 1094 1095 static void 1096 ptc_drvinit(void *unused) 1097 { 1098 int i; 1099 1100 #ifdef UNIX98_PTYS 1101 /* 1102 * Unix98 pty stuff. 1103 * Create the clonable base device. 1104 */ 1105 make_autoclone_dev(&ptc_ops, &DEVFS_CLONE_BITMAP(pty), ptyclone, 1106 0, 0, 0666, "ptmx"); 1107 #endif 1108 1109 for (i = 0; i < 256; i++) { 1110 ptyinit(i); 1111 } 1112 } 1113 1114 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 1115