| 1 | /* $NetBSD: tty_pty.c,v 1.142 2015/08/20 09:45:45 christos Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1982, 1986, 1989, 1993 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. Neither the name of the University nor the names of its contributors |
| 16 | * may be used to endorse or promote products derived from this software |
| 17 | * without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | * |
| 31 | * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 |
| 32 | */ |
| 33 | |
| 34 | /* |
| 35 | * Pseudo-teletype Driver |
| 36 | * (Actually two drivers, requiring two entries in 'cdevsw') |
| 37 | */ |
| 38 | |
| 39 | #include <sys/cdefs.h> |
| 40 | __KERNEL_RCSID(0, "$NetBSD: tty_pty.c,v 1.142 2015/08/20 09:45:45 christos Exp $" ); |
| 41 | |
| 42 | #include "opt_ptm.h" |
| 43 | |
| 44 | #define TTY_ALLOW_PRIVATE |
| 45 | |
| 46 | #include <sys/param.h> |
| 47 | #include <sys/systm.h> |
| 48 | #include <sys/ioctl.h> |
| 49 | #include <sys/ioctl_compat.h> |
| 50 | #include <sys/proc.h> |
| 51 | #include <sys/tty.h> |
| 52 | #include <sys/stat.h> |
| 53 | #include <sys/file.h> |
| 54 | #include <sys/kernel.h> |
| 55 | #include <sys/vnode.h> |
| 56 | #include <sys/namei.h> |
| 57 | #include <sys/signalvar.h> |
| 58 | #include <sys/uio.h> |
| 59 | #include <sys/filedesc.h> |
| 60 | #include <sys/conf.h> |
| 61 | #include <sys/poll.h> |
| 62 | #include <sys/pty.h> |
| 63 | #include <sys/kauth.h> |
| 64 | |
| 65 | #include "ioconf.h" |
| 66 | |
| 67 | #define DEFAULT_NPTYS 16 /* default number of initial ptys */ |
| 68 | #define DEFAULT_MAXPTYS 992 /* default maximum number of ptys */ |
| 69 | |
| 70 | #define BUFSIZ 100 /* Chunk size iomoved to/from user */ |
| 71 | |
| 72 | struct pt_softc { |
| 73 | struct tty *pt_tty; |
| 74 | int pt_flags; |
| 75 | struct selinfo pt_selr, pt_selw; |
| 76 | u_char pt_send; |
| 77 | u_char pt_ucntl; |
| 78 | }; |
| 79 | |
| 80 | static struct pt_softc **pt_softc = NULL; /* pty array */ |
| 81 | static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ |
| 82 | kmutex_t pt_softc_mutex; |
| 83 | int npty = 0; /* for pstat -t */ |
| 84 | |
| 85 | #define PF_PKT 0x08 /* packet mode */ |
| 86 | #define PF_STOPPED 0x10 /* user told stopped */ |
| 87 | #define PF_REMOTE 0x20 /* remote and flow controlled input */ |
| 88 | #define PF_NOSTOP 0x40 |
| 89 | #define PF_UCNTL 0x80 /* user control mode */ |
| 90 | |
| 91 | void ptcwakeup(struct tty *, int); |
| 92 | void ptsstart(struct tty *); |
| 93 | int pty_maxptys(int, int); |
| 94 | |
| 95 | static struct pt_softc **ptyarralloc(int); |
| 96 | |
| 97 | dev_type_open(ptcopen); |
| 98 | dev_type_close(ptcclose); |
| 99 | dev_type_read(ptcread); |
| 100 | dev_type_write(ptcwrite); |
| 101 | dev_type_poll(ptcpoll); |
| 102 | dev_type_kqfilter(ptckqfilter); |
| 103 | |
| 104 | dev_type_open(ptsopen); |
| 105 | dev_type_close(ptsclose); |
| 106 | dev_type_read(ptsread); |
| 107 | dev_type_write(ptswrite); |
| 108 | dev_type_stop(ptsstop); |
| 109 | dev_type_poll(ptspoll); |
| 110 | |
| 111 | dev_type_ioctl(ptyioctl); |
| 112 | dev_type_tty(ptytty); |
| 113 | |
| 114 | const struct cdevsw ptc_cdevsw = { |
| 115 | .d_open = ptcopen, |
| 116 | .d_close = ptcclose, |
| 117 | .d_read = ptcread, |
| 118 | .d_write = ptcwrite, |
| 119 | .d_ioctl = ptyioctl, |
| 120 | .d_stop = nullstop, |
| 121 | .d_tty = ptytty, |
| 122 | .d_poll = ptcpoll, |
| 123 | .d_mmap = nommap, |
| 124 | .d_kqfilter = ptckqfilter, |
| 125 | .d_discard = nodiscard, |
| 126 | .d_flag = D_TTY |
| 127 | }; |
| 128 | |
| 129 | const struct cdevsw pts_cdevsw = { |
| 130 | .d_open = ptsopen, |
| 131 | .d_close = ptsclose, |
| 132 | .d_read = ptsread, |
| 133 | .d_write = ptswrite, |
| 134 | .d_ioctl = ptyioctl, |
| 135 | .d_stop = ptsstop, |
| 136 | .d_tty = ptytty, |
| 137 | .d_poll = ptspoll, |
| 138 | .d_mmap = nommap, |
| 139 | .d_kqfilter = ttykqfilter, |
| 140 | .d_discard = nodiscard, |
| 141 | .d_flag = D_TTY |
| 142 | }; |
| 143 | |
| 144 | #if defined(pmax) |
| 145 | /* |
| 146 | * Used by arch/pmax/conf/majors.pmax, which needs a second copy as it |
| 147 | * needs to map this stuff to two pairs of majors. |
| 148 | */ |
| 149 | |
| 150 | const struct cdevsw ptc_ultrix_cdevsw = { |
| 151 | .d_open = ptcopen, |
| 152 | .d_close = ptcclose, |
| 153 | .d_read = ptcread, |
| 154 | .d_write = ptcwrite, |
| 155 | .d_ioctl = ptyioctl, |
| 156 | .d_stop = nullstop, |
| 157 | .d_tty = ptytty, |
| 158 | .d_poll = ptcpoll, |
| 159 | .d_mmap = nommap, |
| 160 | .d_kqfilter = ptckqfilter, |
| 161 | .d_discard = nodiscard, |
| 162 | .d_flag = D_TTY |
| 163 | }; |
| 164 | |
| 165 | const struct cdevsw pts_ultrix_cdevsw = { |
| 166 | .d_open = ptsopen, |
| 167 | .d_close = ptsclose, |
| 168 | .d_read = ptsread, |
| 169 | .d_write = ptswrite, |
| 170 | .d_ioctl = ptyioctl, |
| 171 | .d_stop = ptsstop, |
| 172 | .d_tty = ptytty, |
| 173 | .d_poll = ptspoll, |
| 174 | .d_mmap = nommap, |
| 175 | .d_kqfilter = ttykqfilter, |
| 176 | .d_discard = nodiscard, |
| 177 | .d_flag = D_TTY |
| 178 | }; |
| 179 | #endif /* defined(pmax) */ |
| 180 | |
| 181 | /* |
| 182 | * Check if a pty is free to use. |
| 183 | */ |
| 184 | int |
| 185 | pty_isfree(int minor, int lock) |
| 186 | { |
| 187 | struct pt_softc *pt = pt_softc[minor]; |
| 188 | if (lock) |
| 189 | mutex_enter(&pt_softc_mutex); |
| 190 | minor = pt == NULL || pt->pt_tty == NULL || |
| 191 | pt->pt_tty->t_oproc == NULL; |
| 192 | if (lock) |
| 193 | mutex_exit(&pt_softc_mutex); |
| 194 | return minor; |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * Allocate and zero array of nelem elements. |
| 199 | */ |
| 200 | static struct pt_softc ** |
| 201 | ptyarralloc(int nelem) |
| 202 | { |
| 203 | struct pt_softc **pt; |
| 204 | nelem += 10; |
| 205 | pt = kmem_zalloc(nelem * sizeof(*pt), KM_SLEEP); |
| 206 | return pt; |
| 207 | } |
| 208 | |
| 209 | static void |
| 210 | ptyarrfree(struct pt_softc **pt, int nelem) |
| 211 | { |
| 212 | |
| 213 | nelem += 10; |
| 214 | kmem_free(pt, nelem * sizeof(*pt)); |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * Check if the minor is correct and ensure necessary structures |
| 219 | * are properly allocated. |
| 220 | */ |
| 221 | int |
| 222 | pty_check(int ptn) |
| 223 | { |
| 224 | struct pt_softc *pti; |
| 225 | |
| 226 | if (ptn >= npty) { |
| 227 | struct pt_softc **newpt, **oldpt; |
| 228 | int newnpty; |
| 229 | int oldnpty; |
| 230 | |
| 231 | /* check if the requested pty can be granted */ |
| 232 | if (ptn >= maxptys) { |
| 233 | limit_reached: |
| 234 | tablefull("pty" , "increase kern.maxptys" ); |
| 235 | return ENXIO; |
| 236 | } |
| 237 | |
| 238 | /* Allocate a larger pty array */ |
| 239 | for (newnpty = npty; newnpty <= ptn;) |
| 240 | newnpty *= 2; |
| 241 | if (newnpty > maxptys) |
| 242 | newnpty = maxptys; |
| 243 | newpt = ptyarralloc(newnpty); |
| 244 | |
| 245 | /* |
| 246 | * Now grab the pty array mutex - we need to ensure |
| 247 | * that the pty array is consistent while copying its |
| 248 | * content to newly allocated, larger space; we also |
| 249 | * need to be safe against pty_maxptys(). |
| 250 | */ |
| 251 | mutex_enter(&pt_softc_mutex); |
| 252 | |
| 253 | if (newnpty >= maxptys) { |
| 254 | /* limit cut away beneath us... */ |
| 255 | if (ptn >= maxptys) { |
| 256 | mutex_exit(&pt_softc_mutex); |
| 257 | ptyarrfree(newpt, newnpty); |
| 258 | goto limit_reached; |
| 259 | } |
| 260 | newnpty = maxptys; |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * If the pty array was not enlarged while we were waiting |
| 265 | * for mutex, copy current contents of pt_softc[] to newly |
| 266 | * allocated array and start using the new bigger array. |
| 267 | */ |
| 268 | if (newnpty > npty) { |
| 269 | memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); |
| 270 | oldpt = pt_softc; |
| 271 | oldnpty = npty; |
| 272 | pt_softc = newpt; |
| 273 | npty = newnpty; |
| 274 | } else { |
| 275 | /* was enlarged when waited for lock, free new space */ |
| 276 | oldpt = newpt; |
| 277 | oldnpty = newnpty; |
| 278 | } |
| 279 | |
| 280 | mutex_exit(&pt_softc_mutex); |
| 281 | ptyarrfree(oldpt, oldnpty); |
| 282 | } |
| 283 | |
| 284 | /* |
| 285 | * If the entry is not yet allocated, allocate one. The mutex is |
| 286 | * needed so that the state of pt_softc[] array is consistant |
| 287 | * in case it has been lengthened above. |
| 288 | */ |
| 289 | if (!pt_softc[ptn]) { |
| 290 | pti = kmem_zalloc(sizeof(*pti), KM_SLEEP); |
| 291 | |
| 292 | selinit(&pti->pt_selr); |
| 293 | selinit(&pti->pt_selw); |
| 294 | pti->pt_tty = tty_alloc(); |
| 295 | |
| 296 | mutex_enter(&pt_softc_mutex); |
| 297 | |
| 298 | /* |
| 299 | * Check the entry again - it might have been |
| 300 | * added while we were waiting for mutex. |
| 301 | */ |
| 302 | if (pt_softc[ptn]) { |
| 303 | mutex_exit(&pt_softc_mutex); |
| 304 | tty_free(pti->pt_tty); |
| 305 | seldestroy(&pti->pt_selr); |
| 306 | seldestroy(&pti->pt_selw); |
| 307 | kmem_free(pti, sizeof(*pti)); |
| 308 | return 0; |
| 309 | } |
| 310 | tty_attach(pti->pt_tty); |
| 311 | pt_softc[ptn] = pti; |
| 312 | |
| 313 | mutex_exit(&pt_softc_mutex); |
| 314 | } |
| 315 | |
| 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | /* |
| 320 | * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise |
| 321 | * new value of maxptys. |
| 322 | */ |
| 323 | int |
| 324 | pty_maxptys(int newmax, int set) |
| 325 | { |
| 326 | if (!set) |
| 327 | return maxptys; |
| 328 | |
| 329 | /* |
| 330 | * We have to grab the pt_softc lock, so that we would pick correct |
| 331 | * value of npty (might be modified in pty_check()). |
| 332 | */ |
| 333 | mutex_enter(&pt_softc_mutex); |
| 334 | |
| 335 | /* |
| 336 | * The value cannot be set to value lower than the highest pty |
| 337 | * number ever allocated. |
| 338 | */ |
| 339 | if (newmax >= npty) |
| 340 | maxptys = newmax; |
| 341 | else |
| 342 | newmax = 0; |
| 343 | |
| 344 | mutex_exit(&pt_softc_mutex); |
| 345 | |
| 346 | return newmax; |
| 347 | } |
| 348 | |
| 349 | /* |
| 350 | * Establish n (or default if n is 1) ptys in the system. |
| 351 | */ |
| 352 | void |
| 353 | ptyattach(int n) |
| 354 | { |
| 355 | |
| 356 | mutex_init(&pt_softc_mutex, MUTEX_DEFAULT, IPL_NONE); |
| 357 | |
| 358 | /* maybe should allow 0 => none? */ |
| 359 | if (n <= 1) |
| 360 | n = DEFAULT_NPTYS; |
| 361 | pt_softc = ptyarralloc(n); |
| 362 | npty = n; |
| 363 | #ifndef NO_DEV_PTM |
| 364 | ptmattach(1); |
| 365 | #endif |
| 366 | } |
| 367 | |
| 368 | /*ARGSUSED*/ |
| 369 | int |
| 370 | ptsopen(dev_t dev, int flag, int devtype, struct lwp *l) |
| 371 | { |
| 372 | struct pt_softc *pti; |
| 373 | struct tty *tp; |
| 374 | int error; |
| 375 | int ptn = minor(dev); |
| 376 | |
| 377 | if ((error = pty_check(ptn)) != 0) |
| 378 | return error; |
| 379 | |
| 380 | mutex_spin_enter(&tty_lock); |
| 381 | pti = pt_softc[ptn]; |
| 382 | tp = pti->pt_tty; |
| 383 | if (!ISSET(tp->t_state, TS_ISOPEN)) { |
| 384 | tp->t_dev = dev; |
| 385 | ttychars(tp); /* Set up default chars */ |
| 386 | tp->t_iflag = TTYDEF_IFLAG; |
| 387 | tp->t_oflag = TTYDEF_OFLAG; |
| 388 | tp->t_lflag = TTYDEF_LFLAG; |
| 389 | tp->t_cflag = TTYDEF_CFLAG; |
| 390 | tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; |
| 391 | ttsetwater(tp); /* would be done in xxparam() */ |
| 392 | } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, |
| 393 | tp) != 0) { |
| 394 | mutex_spin_exit(&tty_lock); |
| 395 | return EBUSY; |
| 396 | } |
| 397 | if (tp->t_oproc) /* Ctrlr still around. */ |
| 398 | SET(tp->t_state, TS_CARR_ON); |
| 399 | if (!ISSET(flag, O_NONBLOCK)) { |
| 400 | while (!ISSET(tp->t_state, TS_CARR_ON)) { |
| 401 | tp->t_wopen++; |
| 402 | error = ttysleep(tp, &tp->t_rawcv, true, 0); |
| 403 | tp->t_wopen--; |
| 404 | if (error != 0) { |
| 405 | mutex_spin_exit(&tty_lock); |
| 406 | return error; |
| 407 | } |
| 408 | } |
| 409 | } |
| 410 | mutex_spin_exit(&tty_lock); |
| 411 | error = (*tp->t_linesw->l_open)(dev, tp); |
| 412 | ptcwakeup(tp, FREAD|FWRITE); |
| 413 | return error; |
| 414 | } |
| 415 | |
| 416 | int |
| 417 | ptsclose(dev_t dev, int flag, int mode, struct lwp *l) |
| 418 | { |
| 419 | struct pt_softc *pti = pt_softc[minor(dev)]; |
| 420 | struct tty *tp = pti->pt_tty; |
| 421 | int error; |
| 422 | |
| 423 | error = (*tp->t_linesw->l_close)(tp, flag); |
| 424 | error |= ttyclose(tp); |
| 425 | ptcwakeup(tp, FREAD|FWRITE); |
| 426 | return error; |
| 427 | } |
| 428 | |
| 429 | int |
| 430 | ptsread(dev_t dev, struct uio *uio, int flag) |
| 431 | { |
| 432 | struct proc *p = curproc; |
| 433 | struct pt_softc *pti = pt_softc[minor(dev)]; |
| 434 | struct tty *tp = pti->pt_tty; |
| 435 | int error = 0; |
| 436 | int cc, c; |
| 437 | |
| 438 | again: |
| 439 | if (pti->pt_flags & PF_REMOTE) { |
| 440 | mutex_spin_enter(&tty_lock); |
| 441 | while (isbackground(p, tp)) { /* XXXSMP */ |
| 442 | if (sigismasked(curlwp, SIGTTIN) || |
| 443 | p->p_pgrp->pg_jobc == 0 || |
| 444 | p->p_lflag & PL_PPWAIT) { |
| 445 | mutex_spin_exit(&tty_lock); |
| 446 | return EIO; |
| 447 | } |
| 448 | ttysig(tp, TTYSIG_PG1, SIGTTIN); |
| 449 | error = ttypause(tp, hz); |
| 450 | if (error != 0) { |
| 451 | mutex_spin_exit(&tty_lock); |
| 452 | return error; |
| 453 | } |
| 454 | } |
| 455 | if (tp->t_canq.c_cc == 0) { |
| 456 | if (flag & IO_NDELAY) { |
| 457 | mutex_spin_exit(&tty_lock); |
| 458 | return EWOULDBLOCK; |
| 459 | } |
| 460 | error = ttysleep(tp, &tp->t_cancv, true, 0); |
| 461 | mutex_spin_exit(&tty_lock); |
| 462 | if (error != 0) |
| 463 | return error; |
| 464 | goto again; |
| 465 | } |
| 466 | while(error == 0 && tp->t_canq.c_cc > 1 && uio->uio_resid > 0) { |
| 467 | c = getc(&tp->t_canq); |
| 468 | mutex_spin_exit(&tty_lock); |
| 469 | error = ureadc(c, uio); |
| 470 | mutex_spin_enter(&tty_lock); |
| 471 | /* Re-check terminal state here? */ |
| 472 | } |
| 473 | if (tp->t_canq.c_cc == 1) |
| 474 | (void) getc(&tp->t_canq); |
| 475 | cc = tp->t_canq.c_cc; |
| 476 | mutex_spin_exit(&tty_lock); |
| 477 | if (cc) |
| 478 | return error; |
| 479 | } else if (tp->t_oproc) |
| 480 | error = (*tp->t_linesw->l_read)(tp, uio, flag); |
| 481 | ptcwakeup(tp, FWRITE); |
| 482 | return error; |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Write to pseudo-tty. |
| 487 | * Wakeups of controlling tty will happen |
| 488 | * indirectly, when tty driver calls ptsstart. |
| 489 | */ |
| 490 | int |
| 491 | ptswrite(dev_t dev, struct uio *uio, int flag) |
| 492 | { |
| 493 | struct pt_softc *pti = pt_softc[minor(dev)]; |
| 494 | struct tty *tp = pti->pt_tty; |
| 495 | |
| 496 | if (tp->t_oproc == NULL) |
| 497 | return EIO; |
| 498 | return (*tp->t_linesw->l_write)(tp, uio, flag); |
| 499 | } |
| 500 | |
| 501 | /* |
| 502 | * Poll pseudo-tty. |
| 503 | */ |
| 504 | int |
| 505 | ptspoll(dev_t dev, int events, struct lwp *l) |
| 506 | { |
| 507 | struct pt_softc *pti = pt_softc[minor(dev)]; |
| 508 | struct tty *tp = pti->pt_tty; |
| 509 | |
| 510 | if (tp->t_oproc == NULL) |
| 511 | return POLLHUP; |
| 512 | |
| 513 | return (*tp->t_linesw->l_poll)(tp, events, l); |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * Start output on pseudo-tty. |
| 518 | * Wake up process polling or sleeping for input from controlling tty. |
| 519 | */ |
| 520 | void |
| 521 | ptsstart(struct tty *tp) |
| 522 | { |
| 523 | struct pt_softc *pti; |
| 524 | |
| 525 | KASSERT(tp->t_dev != NODEV); |
| 526 | pti = pt_softc[minor(tp->t_dev)]; |
| 527 | |
| 528 | KASSERT(mutex_owned(&tty_lock)); |
| 529 | |
| 530 | if (ISSET(tp->t_state, TS_TTSTOP)) |
| 531 | return; |
| 532 | if (pti->pt_flags & PF_STOPPED) { |
| 533 | pti->pt_flags &= ~PF_STOPPED; |
| 534 | pti->pt_send = TIOCPKT_START; |
| 535 | } |
| 536 | |
| 537 | selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); |
| 538 | cv_broadcast(&tp->t_outcvf); |
| 539 | } |
| 540 | |
| 541 | /* |
| 542 | * Stop output. |
| 543 | */ |
| 544 | void |
| 545 | ptsstop(struct tty *tp, int flush) |
| 546 | { |
| 547 | struct pt_softc *pti; |
| 548 | |
| 549 | KASSERT(tp->t_dev != NODEV); |
| 550 | pti = pt_softc[minor(tp->t_dev)]; |
| 551 | |
| 552 | KASSERT(mutex_owned(&tty_lock)); |
| 553 | |
| 554 | /* note: FLUSHREAD and FLUSHWRITE already ok */ |
| 555 | CTASSERT(TIOCPKT_FLUSHREAD == FREAD); |
| 556 | CTASSERT(TIOCPKT_FLUSHWRITE == FWRITE); |
| 557 | if (flush == 0) { |
| 558 | flush = TIOCPKT_STOP; |
| 559 | pti->pt_flags |= PF_STOPPED; |
| 560 | } else |
| 561 | pti->pt_flags &= ~PF_STOPPED; |
| 562 | pti->pt_send |= flush; |
| 563 | |
| 564 | /* change of perspective */ |
| 565 | if (flush & FREAD) { |
| 566 | selnotify(&pti->pt_selw, 0, NOTE_SUBMIT); |
| 567 | cv_broadcast(&tp->t_rawcvf); |
| 568 | } |
| 569 | if (flush & FWRITE) { |
| 570 | selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); |
| 571 | cv_broadcast(&tp->t_outcvf); |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | void |
| 576 | ptcwakeup(struct tty *tp, int flag) |
| 577 | { |
| 578 | struct pt_softc *pti; |
| 579 | |
| 580 | if (tp->t_dev == NODEV) |
| 581 | return; /* client side not open yet */ |
| 582 | |
| 583 | pti = pt_softc[minor(tp->t_dev)]; |
| 584 | KASSERT(pti != NULL); |
| 585 | |
| 586 | mutex_spin_enter(&tty_lock); |
| 587 | if (flag & FREAD) { |
| 588 | selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); |
| 589 | cv_broadcast(&tp->t_outcvf); |
| 590 | } |
| 591 | if (flag & FWRITE) { |
| 592 | selnotify(&pti->pt_selw, 0, NOTE_SUBMIT); |
| 593 | cv_broadcast(&tp->t_rawcvf); |
| 594 | } |
| 595 | mutex_spin_exit(&tty_lock); |
| 596 | } |
| 597 | |
| 598 | /*ARGSUSED*/ |
| 599 | int |
| 600 | ptcopen(dev_t dev, int flag, int devtype, struct lwp *l) |
| 601 | { |
| 602 | struct pt_softc *pti; |
| 603 | struct tty *tp; |
| 604 | int error; |
| 605 | int ptn = minor(dev); |
| 606 | |
| 607 | if ((error = pty_check(ptn)) != 0) |
| 608 | return error; |
| 609 | |
| 610 | pti = pt_softc[ptn]; |
| 611 | tp = pti->pt_tty; |
| 612 | |
| 613 | mutex_spin_enter(&tty_lock); |
| 614 | if (tp->t_oproc) { |
| 615 | mutex_spin_exit(&tty_lock); |
| 616 | return EIO; |
| 617 | } |
| 618 | tp->t_dev = dev; |
| 619 | tp->t_oproc = ptsstart; |
| 620 | mutex_spin_exit(&tty_lock); |
| 621 | (void)(*tp->t_linesw->l_modem)(tp, 1); |
| 622 | CLR(tp->t_lflag, EXTPROC); |
| 623 | pti->pt_flags = 0; |
| 624 | pti->pt_send = 0; |
| 625 | pti->pt_ucntl = 0; |
| 626 | return 0; |
| 627 | } |
| 628 | |
| 629 | /*ARGSUSED*/ |
| 630 | int |
| 631 | ptcclose(dev_t dev, int flag, int devtype, struct lwp *l) |
| 632 | { |
| 633 | struct pt_softc *pti = pt_softc[minor(dev)]; |
| 634 | struct tty *tp = pti->pt_tty; |
| 635 | |
| 636 | (void)(*tp->t_linesw->l_modem)(tp, 0); |
| 637 | mutex_spin_enter(&tty_lock); |
| 638 | CLR(tp->t_state, TS_CARR_ON); |
| 639 | tp->t_oproc = NULL; /* mark closed */ |
| 640 | mutex_spin_exit(&tty_lock); |
| 641 | return 0; |
| 642 | } |
| 643 | |
| 644 | int |
| 645 | ptcread(dev_t dev, struct uio *uio, int flag) |
| 646 | { |
| 647 | struct pt_softc *pti = pt_softc[minor(dev)]; |
| 648 | struct tty *tp = pti->pt_tty; |
| 649 | u_char bf[BUFSIZ]; |
| 650 | int error = 0, cc; |
| 651 | int c; |
| 652 | |
| 653 | if (uio->uio_resid <= 0) |
| 654 | return EINVAL; |
| 655 | |
| 656 | /* |
| 657 | * We want to block until the slave |
| 658 | * is open, and there's something to read; |
| 659 | * but if we lost the slave or we're NBIO, |
| 660 | * then return the appropriate error instead. |
| 661 | */ |
| 662 | mutex_spin_enter(&tty_lock); |
| 663 | for (;;) { |
| 664 | if (ISSET(tp->t_state, TS_ISOPEN)) { |
| 665 | if (pti->pt_flags & PF_PKT && (c = pti->pt_send)) { |
| 666 | pti->pt_send = 0; |
| 667 | mutex_spin_exit(&tty_lock); |
| 668 | error = ureadc(c, uio); |
| 669 | if (error != 0) |
| 670 | return error; |
| 671 | /* |
| 672 | * Since we don't have the tty locked, there's |
| 673 | * a risk of messing up `t_termios'. This is |
| 674 | * relevant only if the tty got closed and then |
| 675 | * opened again while we were out uiomoving. |
| 676 | */ |
| 677 | if (c & TIOCPKT_IOCTL) { |
| 678 | cc = min(uio->uio_resid, |
| 679 | sizeof(tp->t_termios)); |
| 680 | uiomove((void *) &tp->t_termios, |
| 681 | cc, uio); |
| 682 | } |
| 683 | return 0; |
| 684 | } |
| 685 | if (pti->pt_flags & PF_UCNTL && (c = pti->pt_ucntl)) { |
| 686 | pti->pt_ucntl = 0; |
| 687 | mutex_spin_exit(&tty_lock); |
| 688 | error = ureadc(c, uio); |
| 689 | if (error != 0) |
| 690 | return error; |
| 691 | return 0; |
| 692 | } |
| 693 | if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) |
| 694 | break; |
| 695 | } |
| 696 | if (!ISSET(tp->t_state, TS_CARR_ON)) { |
| 697 | error = 0; /* EOF */ |
| 698 | goto out; |
| 699 | } |
| 700 | if (flag & IO_NDELAY) { |
| 701 | error = EWOULDBLOCK; |
| 702 | goto out; |
| 703 | } |
| 704 | error = cv_wait_sig(&tp->t_outcvf, &tty_lock); |
| 705 | if (error != 0) |
| 706 | goto out; |
| 707 | } |
| 708 | |
| 709 | if (pti->pt_flags & (PF_PKT|PF_UCNTL)) { |
| 710 | mutex_spin_exit(&tty_lock); |
| 711 | error = ureadc(0, uio); |
| 712 | mutex_spin_enter(&tty_lock); |
| 713 | if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) |
| 714 | error = EIO; |
| 715 | } |
| 716 | while (uio->uio_resid > 0 && error == 0) { |
| 717 | cc = q_to_b(&tp->t_outq, bf, min(uio->uio_resid, BUFSIZ)); |
| 718 | if (cc <= 0) |
| 719 | break; |
| 720 | mutex_spin_exit(&tty_lock); |
| 721 | error = uiomove(bf, cc, uio); |
| 722 | mutex_spin_enter(&tty_lock); |
| 723 | if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) |
| 724 | error = EIO; |
| 725 | } |
| 726 | ttypull(tp); |
| 727 | out: |
| 728 | mutex_spin_exit(&tty_lock); |
| 729 | return error; |
| 730 | } |
| 731 | |
| 732 | |
| 733 | int |
| 734 | ptcwrite(dev_t dev, struct uio *uio, int flag) |
| 735 | { |
| 736 | struct pt_softc *pti = pt_softc[minor(dev)]; |
| 737 | struct tty *tp = pti->pt_tty; |
| 738 | u_char *cp = NULL; |
| 739 | int cc = 0; |
| 740 | u_char locbuf[BUFSIZ]; |
| 741 | int cnt = 0; |
| 742 | int error = 0; |
| 743 | |
| 744 | again: |
| 745 | mutex_spin_enter(&tty_lock); |
| 746 | if (!ISSET(tp->t_state, TS_ISOPEN)) |
| 747 | goto block; |
| 748 | if (pti->pt_flags & PF_REMOTE) { |
| 749 | if (tp->t_canq.c_cc) |
| 750 | goto block; |
| 751 | while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG) { |
| 752 | if (cc == 0) { |
| 753 | cc = min(uio->uio_resid, BUFSIZ); |
| 754 | cc = min(cc, TTYHOG - tp->t_canq.c_cc); |
| 755 | cp = locbuf; |
| 756 | mutex_spin_exit(&tty_lock); |
| 757 | error = uiomove(cp, cc, uio); |
| 758 | if (error != 0) |
| 759 | return error; |
| 760 | mutex_spin_enter(&tty_lock); |
| 761 | /* check again for safety */ |
| 762 | if (!ISSET(tp->t_state, TS_ISOPEN)) { |
| 763 | /* |
| 764 | * adjust for data copied in but not |
| 765 | * written |
| 766 | */ |
| 767 | uio->uio_resid += cc; |
| 768 | error = EIO; |
| 769 | goto out; |
| 770 | } |
| 771 | } |
| 772 | if (cc) { |
| 773 | cc = b_to_q(cp, cc, &tp->t_outq); |
| 774 | if (cc > 0) |
| 775 | goto block; |
| 776 | } |
| 777 | } |
| 778 | (void) putc(0, &tp->t_canq); |
| 779 | ttwakeup(tp); |
| 780 | cv_broadcast(&tp->t_cancv); |
| 781 | error = 0; |
| 782 | goto out; |
| 783 | } |
| 784 | while (uio->uio_resid > 0) { |
| 785 | if (cc == 0) { |
| 786 | cc = min(uio->uio_resid, BUFSIZ); |
| 787 | cp = locbuf; |
| 788 | mutex_spin_exit(&tty_lock); |
| 789 | error = uiomove(cp, cc, uio); |
| 790 | if (error != 0) |
| 791 | return error; |
| 792 | mutex_spin_enter(&tty_lock); |
| 793 | /* check again for safety */ |
| 794 | if (!ISSET(tp->t_state, TS_ISOPEN)) { |
| 795 | /* adjust for data copied in but not written */ |
| 796 | uio->uio_resid += cc; |
| 797 | error = EIO; |
| 798 | goto out; |
| 799 | } |
| 800 | } |
| 801 | while (cc > 0) { |
| 802 | int used = tp->t_rawq.c_cc + tp->t_canq.c_cc; |
| 803 | int canon = ISSET(tp->t_lflag, ICANON) ? 1 : 0; |
| 804 | /* |
| 805 | * We need space for 2 characters if canonical |
| 806 | * because we might need to print ^C |
| 807 | */ |
| 808 | if (used >= (TTYHOG - canon) && |
| 809 | (tp->t_canq.c_cc > 0 || !canon)) { |
| 810 | cv_broadcast(&tp->t_rawcv); |
| 811 | goto block; |
| 812 | } |
| 813 | /* |
| 814 | * XXX - should change l_rint to be called with lock |
| 815 | * see also tty.c:ttyinput_wlock() |
| 816 | */ |
| 817 | mutex_spin_exit(&tty_lock); |
| 818 | (*tp->t_linesw->l_rint)(*cp++, tp); |
| 819 | mutex_spin_enter(&tty_lock); |
| 820 | cnt++; |
| 821 | cc--; |
| 822 | } |
| 823 | } |
| 824 | error = 0; |
| 825 | goto out; |
| 826 | |
| 827 | block: |
| 828 | /* |
| 829 | * Come here to wait for slave to open, for space |
| 830 | * in outq, or space in rawq. |
| 831 | */ |
| 832 | if (!ISSET(tp->t_state, TS_CARR_ON)) { |
| 833 | /* adjust for data copied in but not written */ |
| 834 | uio->uio_resid += cc; |
| 835 | error = EIO; |
| 836 | goto out; |
| 837 | } |
| 838 | if (flag & IO_NDELAY) { |
| 839 | /* adjust for data copied in but not written */ |
| 840 | uio->uio_resid += cc; |
| 841 | error = cnt == 0 ? EWOULDBLOCK : 0; |
| 842 | goto out; |
| 843 | } |
| 844 | error = cv_wait_sig(&tp->t_rawcvf, &tty_lock); |
| 845 | mutex_spin_exit(&tty_lock); |
| 846 | if (error != 0) { |
| 847 | /* adjust for data copied in but not written */ |
| 848 | uio->uio_resid += cc; |
| 849 | return error; |
| 850 | } |
| 851 | goto again; |
| 852 | |
| 853 | out: |
| 854 | mutex_spin_exit(&tty_lock); |
| 855 | return error; |
| 856 | } |
| 857 | |
| 858 | int |
| 859 | ptcpoll(dev_t dev, int events, struct lwp *l) |
| 860 | { |
| 861 | struct pt_softc *pti = pt_softc[minor(dev)]; |
| 862 | struct tty *tp = pti->pt_tty; |
| 863 | int revents = 0; |
| 864 | |
| 865 | mutex_spin_enter(&tty_lock); |
| 866 | |
| 867 | if (events & (POLLIN | POLLRDNORM)) |
| 868 | if (ISSET(tp->t_state, TS_ISOPEN) && |
| 869 | ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || |
| 870 | ((pti->pt_flags & PF_PKT) && pti->pt_send) || |
| 871 | ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) |
| 872 | revents |= events & (POLLIN | POLLRDNORM); |
| 873 | |
| 874 | if (events & (POLLOUT | POLLWRNORM)) |
| 875 | if (ISSET(tp->t_state, TS_ISOPEN) && |
| 876 | ((pti->pt_flags & PF_REMOTE) ? |
| 877 | (tp->t_canq.c_cc == 0) : |
| 878 | ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || |
| 879 | (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) |
| 880 | revents |= events & (POLLOUT | POLLWRNORM); |
| 881 | |
| 882 | if (events & POLLHUP) |
| 883 | if (!ISSET(tp->t_state, TS_CARR_ON)) |
| 884 | revents |= POLLHUP; |
| 885 | |
| 886 | if (revents == 0) { |
| 887 | if (events & (POLLIN | POLLHUP | POLLRDNORM)) |
| 888 | selrecord(l, &pti->pt_selr); |
| 889 | |
| 890 | if (events & (POLLOUT | POLLWRNORM)) |
| 891 | selrecord(l, &pti->pt_selw); |
| 892 | } |
| 893 | |
| 894 | mutex_spin_exit(&tty_lock); |
| 895 | |
| 896 | return revents; |
| 897 | } |
| 898 | |
| 899 | static void |
| 900 | filt_ptcrdetach(struct knote *kn) |
| 901 | { |
| 902 | struct pt_softc *pti; |
| 903 | |
| 904 | pti = kn->kn_hook; |
| 905 | |
| 906 | mutex_spin_enter(&tty_lock); |
| 907 | SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext); |
| 908 | mutex_spin_exit(&tty_lock); |
| 909 | } |
| 910 | |
| 911 | static int |
| 912 | filt_ptcread(struct knote *kn, long hint) |
| 913 | { |
| 914 | struct pt_softc *pti; |
| 915 | struct tty *tp; |
| 916 | int canread; |
| 917 | |
| 918 | pti = kn->kn_hook; |
| 919 | tp = pti->pt_tty; |
| 920 | |
| 921 | if ((hint & NOTE_SUBMIT) == 0) { |
| 922 | mutex_spin_enter(&tty_lock); |
| 923 | } |
| 924 | |
| 925 | canread = (ISSET(tp->t_state, TS_ISOPEN) && |
| 926 | ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || |
| 927 | ((pti->pt_flags & PF_PKT) && pti->pt_send) || |
| 928 | ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))); |
| 929 | |
| 930 | if (canread) { |
| 931 | /* |
| 932 | * c_cc is number of characters after output post-processing; |
| 933 | * the amount of data actually read(2) depends on |
| 934 | * setting of input flags for the terminal. |
| 935 | */ |
| 936 | kn->kn_data = tp->t_outq.c_cc; |
| 937 | if (((pti->pt_flags & PF_PKT) && pti->pt_send) || |
| 938 | ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) |
| 939 | kn->kn_data++; |
| 940 | } |
| 941 | |
| 942 | if ((hint & NOTE_SUBMIT) == 0) { |
| 943 | mutex_spin_exit(&tty_lock); |
| 944 | } |
| 945 | |
| 946 | return canread; |
| 947 | } |
| 948 | |
| 949 | static void |
| 950 | filt_ptcwdetach(struct knote *kn) |
| 951 | { |
| 952 | struct pt_softc *pti; |
| 953 | |
| 954 | pti = kn->kn_hook; |
| 955 | |
| 956 | mutex_spin_enter(&tty_lock); |
| 957 | SLIST_REMOVE(&pti->pt_selw.sel_klist, kn, knote, kn_selnext); |
| 958 | mutex_spin_exit(&tty_lock); |
| 959 | } |
| 960 | |
| 961 | static int |
| 962 | filt_ptcwrite(struct knote *kn, long hint) |
| 963 | { |
| 964 | struct pt_softc *pti; |
| 965 | struct tty *tp; |
| 966 | int canwrite; |
| 967 | int nwrite; |
| 968 | |
| 969 | pti = kn->kn_hook; |
| 970 | tp = pti->pt_tty; |
| 971 | |
| 972 | if ((hint & NOTE_SUBMIT) == 0) { |
| 973 | mutex_spin_enter(&tty_lock); |
| 974 | } |
| 975 | |
| 976 | canwrite = (ISSET(tp->t_state, TS_ISOPEN) && |
| 977 | ((pti->pt_flags & PF_REMOTE) ? |
| 978 | (tp->t_canq.c_cc == 0) : |
| 979 | ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || |
| 980 | (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))); |
| 981 | |
| 982 | if (canwrite) { |
| 983 | if (pti->pt_flags & PF_REMOTE) |
| 984 | nwrite = tp->t_canq.c_cn; |
| 985 | else { |
| 986 | /* this is guaranteed to be > 0 due to above check */ |
| 987 | nwrite = tp->t_canq.c_cn |
| 988 | - (tp->t_rawq.c_cc + tp->t_canq.c_cc); |
| 989 | } |
| 990 | kn->kn_data = nwrite; |
| 991 | } |
| 992 | |
| 993 | if ((hint & NOTE_SUBMIT) == 0) { |
| 994 | mutex_spin_exit(&tty_lock); |
| 995 | } |
| 996 | |
| 997 | return canwrite; |
| 998 | } |
| 999 | |
| 1000 | static const struct filterops ptcread_filtops = |
| 1001 | { 1, NULL, filt_ptcrdetach, filt_ptcread }; |
| 1002 | static const struct filterops ptcwrite_filtops = |
| 1003 | { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; |
| 1004 | |
| 1005 | int |
| 1006 | ptckqfilter(dev_t dev, struct knote *kn) |
| 1007 | { |
| 1008 | struct pt_softc *pti = pt_softc[minor(dev)]; |
| 1009 | struct klist *klist; |
| 1010 | |
| 1011 | switch (kn->kn_filter) { |
| 1012 | case EVFILT_READ: |
| 1013 | klist = &pti->pt_selr.sel_klist; |
| 1014 | kn->kn_fop = &ptcread_filtops; |
| 1015 | break; |
| 1016 | case EVFILT_WRITE: |
| 1017 | klist = &pti->pt_selw.sel_klist; |
| 1018 | kn->kn_fop = &ptcwrite_filtops; |
| 1019 | break; |
| 1020 | default: |
| 1021 | return EINVAL; |
| 1022 | } |
| 1023 | |
| 1024 | kn->kn_hook = pti; |
| 1025 | |
| 1026 | mutex_spin_enter(&tty_lock); |
| 1027 | SLIST_INSERT_HEAD(klist, kn, kn_selnext); |
| 1028 | mutex_spin_exit(&tty_lock); |
| 1029 | |
| 1030 | return 0; |
| 1031 | } |
| 1032 | |
| 1033 | struct tty * |
| 1034 | ptytty(dev_t dev) |
| 1035 | { |
| 1036 | struct pt_softc *pti = pt_softc[minor(dev)]; |
| 1037 | struct tty *tp = pti->pt_tty; |
| 1038 | |
| 1039 | return tp; |
| 1040 | } |
| 1041 | |
| 1042 | /*ARGSUSED*/ |
| 1043 | int |
| 1044 | ptyioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) |
| 1045 | { |
| 1046 | struct pt_softc *pti = pt_softc[minor(dev)]; |
| 1047 | struct tty *tp = pti->pt_tty; |
| 1048 | const struct cdevsw *cdev; |
| 1049 | u_char *cc = tp->t_cc; |
| 1050 | int stop, error, sig; |
| 1051 | #ifndef NO_DEV_PTM |
| 1052 | struct mount *mp; |
| 1053 | #endif |
| 1054 | |
| 1055 | /* |
| 1056 | * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. |
| 1057 | * ttywflush(tp) will hang if there are characters in the outq. |
| 1058 | */ |
| 1059 | if (cmd == TIOCEXT) { |
| 1060 | /* |
| 1061 | * When the EXTPROC bit is being toggled, we need |
| 1062 | * to send an TIOCPKT_IOCTL if the packet driver |
| 1063 | * is turned on. |
| 1064 | */ |
| 1065 | if (*(int *)data) { |
| 1066 | if (pti->pt_flags & PF_PKT) { |
| 1067 | pti->pt_send |= TIOCPKT_IOCTL; |
| 1068 | ptcwakeup(tp, FREAD); |
| 1069 | } |
| 1070 | SET(tp->t_lflag, EXTPROC); |
| 1071 | } else { |
| 1072 | if (ISSET(tp->t_lflag, EXTPROC) && |
| 1073 | (pti->pt_flags & PF_PKT)) { |
| 1074 | pti->pt_send |= TIOCPKT_IOCTL; |
| 1075 | ptcwakeup(tp, FREAD); |
| 1076 | } |
| 1077 | CLR(tp->t_lflag, EXTPROC); |
| 1078 | } |
| 1079 | return(0); |
| 1080 | } |
| 1081 | |
| 1082 | #ifndef NO_DEV_PTM |
| 1083 | /* Allow getting the name from either the master or the slave */ |
| 1084 | if (cmd == TIOCPTSNAME) { |
| 1085 | if ((error = pty_getmp(l, &mp)) != 0) |
| 1086 | return error; |
| 1087 | return pty_fill_ptmget(l, dev, -1, -1, data, mp); |
| 1088 | } |
| 1089 | #endif |
| 1090 | |
| 1091 | cdev = cdevsw_lookup(dev); |
| 1092 | if (cdev != NULL && cdev->d_open == ptcopen) |
| 1093 | switch (cmd) { |
| 1094 | #ifndef NO_DEV_PTM |
| 1095 | case TIOCGRANTPT: |
| 1096 | if ((error = pty_getmp(l, &mp)) != 0) |
| 1097 | return error; |
| 1098 | return pty_grant_slave(l, dev, mp); |
| 1099 | #endif |
| 1100 | |
| 1101 | case TIOCGPGRP: |
| 1102 | /* |
| 1103 | * We avoid calling ttioctl on the controller since, |
| 1104 | * in that case, tp must be the controlling terminal. |
| 1105 | */ |
| 1106 | *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; |
| 1107 | return 0; |
| 1108 | |
| 1109 | case TIOCPKT: |
| 1110 | if (*(int *)data) { |
| 1111 | if (pti->pt_flags & PF_UCNTL) |
| 1112 | return EINVAL; |
| 1113 | pti->pt_flags |= PF_PKT; |
| 1114 | } else |
| 1115 | pti->pt_flags &= ~PF_PKT; |
| 1116 | return 0; |
| 1117 | |
| 1118 | case TIOCUCNTL: |
| 1119 | if (*(int *)data) { |
| 1120 | if (pti->pt_flags & PF_PKT) |
| 1121 | return EINVAL; |
| 1122 | pti->pt_flags |= PF_UCNTL; |
| 1123 | } else |
| 1124 | pti->pt_flags &= ~PF_UCNTL; |
| 1125 | return 0; |
| 1126 | |
| 1127 | case TIOCREMOTE: |
| 1128 | if (*(int *)data) |
| 1129 | pti->pt_flags |= PF_REMOTE; |
| 1130 | else |
| 1131 | pti->pt_flags &= ~PF_REMOTE; |
| 1132 | mutex_spin_enter(&tty_lock); |
| 1133 | ttyflush(tp, FREAD|FWRITE); |
| 1134 | mutex_spin_exit(&tty_lock); |
| 1135 | return 0; |
| 1136 | |
| 1137 | case TIOCSETP: |
| 1138 | case TIOCSETN: |
| 1139 | case TIOCSETD: |
| 1140 | case TIOCSETA: |
| 1141 | case TIOCSETAW: |
| 1142 | case TIOCSETAF: |
| 1143 | mutex_spin_enter(&tty_lock); |
| 1144 | ndflush(&tp->t_outq, tp->t_outq.c_cc); |
| 1145 | mutex_spin_exit(&tty_lock); |
| 1146 | break; |
| 1147 | |
| 1148 | case TIOCSIG: |
| 1149 | sig = (int)(long)*(void **)data; |
| 1150 | if (sig <= 0 || sig >= NSIG) |
| 1151 | return EINVAL; |
| 1152 | mutex_spin_enter(&tty_lock); |
| 1153 | if (!ISSET(tp->t_lflag, NOFLSH)) |
| 1154 | ttyflush(tp, FREAD|FWRITE); |
| 1155 | tp->t_state |= TS_SIGINFO; |
| 1156 | ttysig(tp, TTYSIG_PG1, sig); |
| 1157 | mutex_spin_exit(&tty_lock); |
| 1158 | return 0; |
| 1159 | |
| 1160 | case FIONREAD: |
| 1161 | mutex_spin_enter(&tty_lock); |
| 1162 | *(int *)data = tp->t_outq.c_cc; |
| 1163 | mutex_spin_exit(&tty_lock); |
| 1164 | return 0; |
| 1165 | } |
| 1166 | |
| 1167 | error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); |
| 1168 | if (error == EPASSTHROUGH) |
| 1169 | error = ttioctl(tp, cmd, data, flag, l); |
| 1170 | if (error == EPASSTHROUGH) { |
| 1171 | if (pti->pt_flags & PF_UCNTL && |
| 1172 | (cmd & ~0xff) == UIOCCMD(0)) { |
| 1173 | if (cmd & 0xff) { |
| 1174 | pti->pt_ucntl = (u_char)cmd; |
| 1175 | ptcwakeup(tp, FREAD); |
| 1176 | } |
| 1177 | return 0; |
| 1178 | } |
| 1179 | } |
| 1180 | /* |
| 1181 | * If external processing and packet mode send ioctl packet. |
| 1182 | */ |
| 1183 | if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { |
| 1184 | switch(cmd) { |
| 1185 | case TIOCSETA: |
| 1186 | case TIOCSETAW: |
| 1187 | case TIOCSETAF: |
| 1188 | case TIOCSETP: |
| 1189 | case TIOCSETN: |
| 1190 | case TIOCSETC: |
| 1191 | case TIOCSLTC: |
| 1192 | case TIOCLBIS: |
| 1193 | case TIOCLBIC: |
| 1194 | case TIOCLSET: |
| 1195 | pti->pt_send |= TIOCPKT_IOCTL; |
| 1196 | ptcwakeup(tp, FREAD); |
| 1197 | default: |
| 1198 | break; |
| 1199 | } |
| 1200 | } |
| 1201 | stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) |
| 1202 | && CCEQ(cc[VSTART], CTRL('q')); |
| 1203 | if (pti->pt_flags & PF_NOSTOP) { |
| 1204 | if (stop) { |
| 1205 | pti->pt_send &= ~TIOCPKT_NOSTOP; |
| 1206 | pti->pt_send |= TIOCPKT_DOSTOP; |
| 1207 | pti->pt_flags &= ~PF_NOSTOP; |
| 1208 | ptcwakeup(tp, FREAD); |
| 1209 | } |
| 1210 | } else { |
| 1211 | if (!stop) { |
| 1212 | pti->pt_send &= ~TIOCPKT_DOSTOP; |
| 1213 | pti->pt_send |= TIOCPKT_NOSTOP; |
| 1214 | pti->pt_flags |= PF_NOSTOP; |
| 1215 | ptcwakeup(tp, FREAD); |
| 1216 | } |
| 1217 | } |
| 1218 | return error; |
| 1219 | } |
| 1220 | |