pty.c revision 11789
1258945Sroberto/* 2258945Sroberto * Copyright (c) 1982, 1986, 1989, 1993 3258945Sroberto * The Regents of the University of California. All rights reserved. 4258945Sroberto * 5258945Sroberto * Redistribution and use in source and binary forms, with or without 6258945Sroberto * modification, are permitted provided that the following conditions 7258945Sroberto * are met: 8258945Sroberto * 1. Redistributions of source code must retain the above copyright 9258945Sroberto * notice, this list of conditions and the following disclaimer. 10258945Sroberto * 2. Redistributions in binary form must reproduce the above copyright 11258945Sroberto * notice, this list of conditions and the following disclaimer in the 12258945Sroberto * documentation and/or other materials provided with the distribution. 13258945Sroberto * 3. All advertising materials mentioning features or use of this software 14258945Sroberto * must display the following acknowledgement: 15258945Sroberto * This product includes software developed by the University of 16258945Sroberto * California, Berkeley and its contributors. 17258945Sroberto * 4. Neither the name of the University nor the names of its contributors 18258945Sroberto * may be used to endorse or promote products derived from this software 19258945Sroberto * without specific prior written permission. 20258945Sroberto * 21258945Sroberto * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22258945Sroberto * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23258945Sroberto * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24258945Sroberto * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25258945Sroberto * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26258945Sroberto * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27258945Sroberto * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28258945Sroberto * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29258945Sroberto * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30258945Sroberto * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31258945Sroberto * SUCH DAMAGE. 32258945Sroberto * 33258945Sroberto * @(#)tty_pty.c 8.2 (Berkeley) 9/23/93 34258945Sroberto * $Id: tty_pty.c,v 1.21 1995/09/19 12:26:47 bde Exp $ 35258945Sroberto */ 36258945Sroberto 37258945Sroberto/* 38258945Sroberto * Pseudo-teletype Driver 39258945Sroberto * (Actually two drivers, requiring two entries in 'cdevsw') 40258945Sroberto */ 41258945Sroberto#include "pty.h" /* XXX */ 42258945Sroberto 43258945Sroberto#include <sys/param.h> 44258945Sroberto#include <sys/systm.h> 45258945Sroberto#include <sys/ioctl.h> 46258945Sroberto#include <sys/proc.h> 47258945Sroberto#include <sys/tty.h> 48258945Sroberto#include <sys/conf.h> 49258945Sroberto#include <sys/file.h> 50258945Sroberto#include <sys/uio.h> 51258945Sroberto#include <sys/kernel.h> 52258945Sroberto#include <sys/vnode.h> 53258945Sroberto#include <sys/signalvar.h> 54258945Sroberto 55258945Srobertovoid ptyattach __P((int n)); 56258945Srobertovoid ptsstart __P((struct tty *tp)); 57258945Srobertovoid ptcwakeup __P((struct tty *tp, int flag)); 58258945Sroberto 59258945Sroberto#if NPTY == 1 60258945Sroberto#undef NPTY 61258945Sroberto#define NPTY 32 /* crude XXX */ 62258945Sroberto#endif 63258945Sroberto 64258945Sroberto#define BUFSIZ 100 /* Chunk size iomoved to/from user */ 65258945Sroberto 66258945Sroberto/* 67258945Sroberto * pts == /dev/tty[pqrs]? 68258945Sroberto * ptc == /dev/pty[pqrs]? 69258945Sroberto */ 70258945Srobertostruct tty pt_tty[NPTY]; /* XXX */ 71258945Srobertostruct pt_ioctl { 72258945Sroberto int pt_flags; 73258945Sroberto struct selinfo pt_selr, pt_selw; 74258945Sroberto u_char pt_send; 75258945Sroberto u_char pt_ucntl; 76258945Sroberto} pt_ioctl[NPTY]; /* XXX */ 77258945Srobertoint npty = NPTY; /* for pstat -t */ 78258945Sroberto 79258945Sroberto#define PF_PKT 0x08 /* packet mode */ 80258945Sroberto#define PF_STOPPED 0x10 /* user told stopped */ 81258945Sroberto#define PF_REMOTE 0x20 /* remote and flow controlled input */ 82258945Sroberto#define PF_NOSTOP 0x40 83258945Sroberto#define PF_UCNTL 0x80 /* user control mode */ 84258945Sroberto 85258945Srobertovoid ptsstop __P((struct tty *, int)); 86258945Srobertovoid ptcwakeup __P((struct tty *, int)); 87258945Sroberto 88258945Sroberto/* 89258945Sroberto * Establish n (or default if n is 1) ptys in the system. 90258945Sroberto * 91258945Sroberto * XXX cdevsw & pstat require the array `pty[]' to be an array 92258945Sroberto */ 93258945Srobertovoid 94258945Srobertoptyattach(n) 95258945Sroberto int n; 96258945Sroberto{ 97258945Sroberto#ifdef notyet 98258945Sroberto char *mem; 99258945Sroberto register u_long ntb; 100258945Sroberto#define DEFAULT_NPTY 32 101258945Sroberto 102258945Sroberto /* maybe should allow 0 => none? */ 103258945Sroberto if (n <= 1) 104258945Sroberto n = DEFAULT_NPTY; 105258945Sroberto ntb = n * sizeof(struct tty); 106258945Sroberto mem = malloc(ntb + ALIGNBYTES + n * sizeof(struct pt_ioctl), 107258945Sroberto M_DEVBUF, M_WAITOK); 108258945Sroberto pt_tty = (struct tty *)mem; 109258945Sroberto mem = (char *)ALIGN(mem + ntb); 110258945Sroberto pt_ioctl = (struct pt_ioctl *)mem; 111258945Sroberto npty = n; 112258945Sroberto#endif 113258945Sroberto} 114258945Sroberto 115258945Sroberto/*ARGSUSED*/ 116258945Srobertoint 117258945Srobertoptsopen(dev, flag, devtype, p) 118258945Sroberto dev_t dev; 119258945Sroberto int flag, devtype; 120258945Sroberto struct proc *p; 121258945Sroberto{ 122258945Sroberto register struct tty *tp; 123258945Sroberto int error; 124258945Sroberto 125258945Sroberto if (minor(dev) >= npty) 126258945Sroberto return (ENXIO); 127258945Sroberto tp = &pt_tty[minor(dev)]; 128258945Sroberto if ((tp->t_state & TS_ISOPEN) == 0) { 129258945Sroberto ttychars(tp); /* Set up default chars */ 130258945Sroberto tp->t_iflag = TTYDEF_IFLAG; 131258945Sroberto tp->t_oflag = TTYDEF_OFLAG; 132258945Sroberto tp->t_lflag = TTYDEF_LFLAG; 133258945Sroberto tp->t_cflag = TTYDEF_CFLAG; 134258945Sroberto tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 135258945Sroberto ttsetwater(tp); /* would be done in xxparam() */ 136258945Sroberto } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) 137258945Sroberto return (EBUSY); 138258945Sroberto if (tp->t_oproc) /* Ctrlr still around. */ 139258945Sroberto (void)(*linesw[tp->t_line].l_modem)(tp, 1); 140258945Sroberto while ((tp->t_state & TS_CARR_ON) == 0) { 141258945Sroberto if (flag&FNONBLOCK) 142258945Sroberto break; 143258945Sroberto error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 144258945Sroberto "ptsopn", 0); 145258945Sroberto if (error) 146258945Sroberto return (error); 147258945Sroberto } 148258945Sroberto error = (*linesw[tp->t_line].l_open)(dev, tp); 149258945Sroberto if (error == 0) 150258945Sroberto ptcwakeup(tp, FREAD|FWRITE); 151258945Sroberto return (error); 152258945Sroberto} 153258945Sroberto 154258945Srobertoint 155258945Srobertoptsclose(dev, flag, mode, p) 156258945Sroberto dev_t dev; 157258945Sroberto int flag, mode; 158258945Sroberto struct proc *p; 159258945Sroberto{ 160258945Sroberto register struct tty *tp; 161258945Sroberto int err; 162258945Sroberto 163258945Sroberto tp = &pt_tty[minor(dev)]; 164258945Sroberto err = (*linesw[tp->t_line].l_close)(tp, flag); 165258945Sroberto ptsstop(tp, FREAD|FWRITE); 166258945Sroberto (void) ttyclose(tp); 167258945Sroberto return (err); 168258945Sroberto} 169258945Sroberto 170258945Srobertoint 171258945Srobertoptsread(dev, uio, flag) 172258945Sroberto dev_t dev; 173258945Sroberto struct uio *uio; 174258945Sroberto int flag; 175258945Sroberto{ 176258945Sroberto struct proc *p = curproc; 177258945Sroberto register struct tty *tp = &pt_tty[minor(dev)]; 178258945Sroberto register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 179258945Sroberto int error = 0; 180258945Sroberto 181258945Srobertoagain: 182258945Sroberto if (pti->pt_flags & PF_REMOTE) { 183258945Sroberto while (isbackground(p, tp)) { 184258945Sroberto if ((p->p_sigignore & sigmask(SIGTTIN)) || 185258945Sroberto (p->p_sigmask & sigmask(SIGTTIN)) || 186258945Sroberto p->p_pgrp->pg_jobc == 0 || 187258945Sroberto p->p_flag & P_PPWAIT) 188258945Sroberto return (EIO); 189258945Sroberto pgsignal(p->p_pgrp, SIGTTIN, 1); 190258945Sroberto error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 191258945Sroberto 0); 192258945Sroberto if (error) 193258945Sroberto return (error); 194258945Sroberto } 195258945Sroberto if (tp->t_canq.c_cc == 0) { 196258945Sroberto if (flag & IO_NDELAY) 197258945Sroberto return (EWOULDBLOCK); 198258945Sroberto error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 199258945Sroberto "ptsin", 0); 200258945Sroberto if (error) 201258945Sroberto return (error); 202258945Sroberto goto again; 203258945Sroberto } 204258945Sroberto while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 205258945Sroberto if (ureadc(getc(&tp->t_canq), uio) < 0) { 206258945Sroberto error = EFAULT; 207258945Sroberto break; 208258945Sroberto } 209258945Sroberto if (tp->t_canq.c_cc == 1) 210258945Sroberto (void) getc(&tp->t_canq); 211258945Sroberto if (tp->t_canq.c_cc) 212258945Sroberto return (error); 213258945Sroberto } else 214258945Sroberto if (tp->t_oproc) 215258945Sroberto error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 216258945Sroberto ptcwakeup(tp, FWRITE); 217258945Sroberto return (error); 218258945Sroberto} 219258945Sroberto 220258945Sroberto/* 221258945Sroberto * Write to pseudo-tty. 222258945Sroberto * Wakeups of controlling tty will happen 223258945Sroberto * indirectly, when tty driver calls ptsstart. 224258945Sroberto */ 225258945Srobertoint 226258945Srobertoptswrite(dev, uio, flag) 227258945Sroberto dev_t dev; 228258945Sroberto struct uio *uio; 229258945Sroberto int flag; 230258945Sroberto{ 231258945Sroberto register struct tty *tp; 232258945Sroberto 233258945Sroberto tp = &pt_tty[minor(dev)]; 234258945Sroberto if (tp->t_oproc == 0) 235258945Sroberto return (EIO); 236258945Sroberto return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 237258945Sroberto} 238258945Sroberto 239258945Sroberto/* 240258945Sroberto * Start output on pseudo-tty. 241258945Sroberto * Wake up process selecting or sleeping for input from controlling tty. 242258945Sroberto */ 243258945Srobertovoid 244258945Srobertoptsstart(tp) 245258945Sroberto struct tty *tp; 246258945Sroberto{ 247258945Sroberto register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 248258945Sroberto 249258945Sroberto if (tp->t_state & TS_TTSTOP) 250258945Sroberto return; 251258945Sroberto if (pti->pt_flags & PF_STOPPED) { 252258945Sroberto pti->pt_flags &= ~PF_STOPPED; 253258945Sroberto pti->pt_send = TIOCPKT_START; 254258945Sroberto } 255258945Sroberto ptcwakeup(tp, FREAD); 256258945Sroberto} 257258945Sroberto 258258945Srobertovoid 259ptcwakeup(tp, flag) 260 struct tty *tp; 261 int flag; 262{ 263 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 264 265 if (flag & FREAD) { 266 selwakeup(&pti->pt_selr); 267 wakeup(TSA_PTC_READ(tp)); 268 } 269 if (flag & FWRITE) { 270 selwakeup(&pti->pt_selw); 271 wakeup(TSA_PTC_WRITE(tp)); 272 } 273} 274 275int 276ptcopen(dev, flag, devtype, p) 277 dev_t dev; 278 int flag, devtype; 279 struct proc *p; 280{ 281 register struct tty *tp; 282 struct pt_ioctl *pti; 283 284 if (minor(dev) >= npty) 285 return (ENXIO); 286 tp = &pt_tty[minor(dev)]; 287 if (tp->t_oproc) 288 return (EIO); 289 tp->t_oproc = ptsstart; 290#ifdef sun4c 291 tp->t_stop = ptsstop; 292#endif 293 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 294 tp->t_lflag &= ~EXTPROC; 295 pti = &pt_ioctl[minor(dev)]; 296 pti->pt_flags = 0; 297 pti->pt_send = 0; 298 pti->pt_ucntl = 0; 299 return (0); 300} 301 302int 303ptcclose(dev, flags, fmt, p) 304 dev_t dev; 305 int flags; 306 int fmt; 307 struct proc *p; 308{ 309 register struct tty *tp; 310 311 tp = &pt_tty[minor(dev)]; 312 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 313 314 /* 315 * XXX MDMBUF makes no sense for ptys but would inhibit the above 316 * l_modem(). CLOCAL makes sense but isn't supported. Special 317 * l_modem()s that ignore carrier drop make no sense for ptys but 318 * may be in use because other parts of the line discipline make 319 * sense for ptys. Recover by doing everything that a normal 320 * ttymodem() would have done except for sending a SIGHUP. 321 */ 322 if (tp->t_state & TS_ISOPEN) { 323 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 324 tp->t_state |= TS_ZOMBIE; 325 ttyflush(tp, FREAD | FWRITE); 326 } 327 328 tp->t_oproc = 0; /* mark closed */ 329 return (0); 330} 331 332int 333ptcread(dev, uio, flag) 334 dev_t dev; 335 struct uio *uio; 336 int flag; 337{ 338 register struct tty *tp = &pt_tty[minor(dev)]; 339 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 340 char buf[BUFSIZ]; 341 int error = 0, cc; 342 343 /* 344 * We want to block until the slave 345 * is open, and there's something to read; 346 * but if we lost the slave or we're NBIO, 347 * then return the appropriate error instead. 348 */ 349 for (;;) { 350 if (tp->t_state&TS_ISOPEN) { 351 if (pti->pt_flags&PF_PKT && pti->pt_send) { 352 error = ureadc((int)pti->pt_send, uio); 353 if (error) 354 return (error); 355 if (pti->pt_send & TIOCPKT_IOCTL) { 356 cc = min(uio->uio_resid, 357 sizeof(tp->t_termios)); 358 uiomove((caddr_t)&tp->t_termios, cc, 359 uio); 360 } 361 pti->pt_send = 0; 362 return (0); 363 } 364 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 365 error = ureadc((int)pti->pt_ucntl, uio); 366 if (error) 367 return (error); 368 pti->pt_ucntl = 0; 369 return (0); 370 } 371 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 372 break; 373 } 374 if ((tp->t_state & TS_CONNECTED) == 0) 375 return (0); /* EOF */ 376 if (flag & IO_NDELAY) 377 return (EWOULDBLOCK); 378 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 379 if (error) 380 return (error); 381 } 382 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 383 error = ureadc(0, uio); 384 while (uio->uio_resid > 0 && error == 0) { 385 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 386 if (cc <= 0) 387 break; 388 error = uiomove(buf, cc, uio); 389 } 390 ttwwakeup(tp); 391 return (error); 392} 393 394void 395ptsstop(tp, flush) 396 register struct tty *tp; 397 int flush; 398{ 399 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 400 int flag; 401 402 /* note: FLUSHREAD and FLUSHWRITE already ok */ 403 if (flush == 0) { 404 flush = TIOCPKT_STOP; 405 pti->pt_flags |= PF_STOPPED; 406 } else 407 pti->pt_flags &= ~PF_STOPPED; 408 pti->pt_send |= flush; 409 /* change of perspective */ 410 flag = 0; 411 if (flush & FREAD) 412 flag |= FWRITE; 413 if (flush & FWRITE) 414 flag |= FREAD; 415 ptcwakeup(tp, flag); 416} 417 418int 419ptcselect(dev, rw, p) 420 dev_t dev; 421 int rw; 422 struct proc *p; 423{ 424 register struct tty *tp = &pt_tty[minor(dev)]; 425 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 426 int s; 427 428 if ((tp->t_state & TS_CONNECTED) == 0) 429 return (1); 430 switch (rw) { 431 432 case FREAD: 433 /* 434 * Need to block timeouts (ttrstart). 435 */ 436 s = spltty(); 437 if ((tp->t_state&TS_ISOPEN) && 438 tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { 439 splx(s); 440 return (1); 441 } 442 splx(s); 443 /* FALLTHROUGH */ 444 445 case 0: /* exceptional */ 446 if ((tp->t_state&TS_ISOPEN) && 447 ((pti->pt_flags&PF_PKT && pti->pt_send) || 448 (pti->pt_flags&PF_UCNTL && pti->pt_ucntl))) 449 return (1); 450 selrecord(p, &pti->pt_selr); 451 break; 452 453 454 case FWRITE: 455 if (tp->t_state&TS_ISOPEN) { 456 if (pti->pt_flags & PF_REMOTE) { 457 if (tp->t_canq.c_cc == 0) 458 return (1); 459 } else { 460 if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 461 return (1); 462 if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON)) 463 return (1); 464 } 465 } 466 selrecord(p, &pti->pt_selw); 467 break; 468 469 } 470 return (0); 471} 472 473int 474ptcwrite(dev, uio, flag) 475 dev_t dev; 476 register struct uio *uio; 477 int flag; 478{ 479 register struct tty *tp = &pt_tty[minor(dev)]; 480 register u_char *cp = 0; 481 register int cc = 0; 482 u_char locbuf[BUFSIZ]; 483 int cnt = 0; 484 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 485 int error = 0; 486 487again: 488 if ((tp->t_state&TS_ISOPEN) == 0) 489 goto block; 490 if (pti->pt_flags & PF_REMOTE) { 491 if (tp->t_canq.c_cc) 492 goto block; 493 while ((uio->uio_resid > 0 || cc > 0) && 494 tp->t_canq.c_cc < TTYHOG - 1) { 495 if (cc == 0) { 496 cc = min(uio->uio_resid, BUFSIZ); 497 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 498 cp = locbuf; 499 error = uiomove((caddr_t)cp, cc, uio); 500 if (error) 501 return (error); 502 /* check again for safety */ 503 if ((tp->t_state & TS_ISOPEN) == 0) { 504 /* adjust as usual */ 505 uio->uio_resid += cc; 506 return (EIO); 507 } 508 } 509 if (cc) 510 cc -= b_to_q((char *)cp, cc, &tp->t_canq); 511 } 512 /* adjust for data copied in but not written */ 513 uio->uio_resid += cc; 514 (void) putc(0, &tp->t_canq); 515 ttwakeup(tp); 516 wakeup(TSA_PTS_READ(tp)); 517 return (0); 518 } 519 while (uio->uio_resid > 0 || cc > 0) { 520 if (cc == 0) { 521 cc = min(uio->uio_resid, BUFSIZ); 522 cp = locbuf; 523 error = uiomove((caddr_t)cp, cc, uio); 524 if (error) 525 return (error); 526 /* check again for safety */ 527 if ((tp->t_state & TS_ISOPEN) == 0) { 528 /* adjust for data copied in but not written */ 529 uio->uio_resid += cc; 530 return (EIO); 531 } 532 } 533 while (cc > 0) { 534 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 535 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 536 wakeup(TSA_HUP_OR_INPUT(tp)); 537 goto block; 538 } 539 (*linesw[tp->t_line].l_rint)(*cp++, tp); 540 cnt++; 541 cc--; 542 } 543 cc = 0; 544 } 545 return (0); 546block: 547 /* 548 * Come here to wait for slave to open, for space 549 * in outq, or space in rawq. 550 */ 551 if ((tp->t_state & TS_CONNECTED) == 0) { 552 /* adjust for data copied in but not written */ 553 uio->uio_resid += cc; 554 return (EIO); 555 } 556 if (flag & IO_NDELAY) { 557 /* adjust for data copied in but not written */ 558 uio->uio_resid += cc; 559 if (cnt == 0) 560 return (EWOULDBLOCK); 561 return (0); 562 } 563 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 564 if (error) { 565 /* adjust for data copied in but not written */ 566 uio->uio_resid += cc; 567 return (error); 568 } 569 goto again; 570} 571 572struct tty * 573ptydevtotty(dev) 574 dev_t dev; 575{ 576 if (minor(dev) >= npty) 577 return (NULL); 578 579 return &pt_tty[minor(dev)]; 580} 581 582/*ARGSUSED*/ 583int 584ptyioctl(dev, cmd, data, flag, p) 585 dev_t dev; 586 int cmd; 587 caddr_t data; 588 int flag; 589 struct proc *p; 590{ 591 register struct tty *tp = &pt_tty[minor(dev)]; 592 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 593 register u_char *cc = tp->t_cc; 594 int stop, error; 595 596 /* 597 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 598 * ttywflush(tp) will hang if there are characters in the outq. 599 */ 600 if (cmd == TIOCEXT) { 601 /* 602 * When the EXTPROC bit is being toggled, we need 603 * to send an TIOCPKT_IOCTL if the packet driver 604 * is turned on. 605 */ 606 if (*(int *)data) { 607 if (pti->pt_flags & PF_PKT) { 608 pti->pt_send |= TIOCPKT_IOCTL; 609 ptcwakeup(tp, FREAD); 610 } 611 tp->t_lflag |= EXTPROC; 612 } else { 613 if ((tp->t_state & EXTPROC) && 614 (pti->pt_flags & PF_PKT)) { 615 pti->pt_send |= TIOCPKT_IOCTL; 616 ptcwakeup(tp, FREAD); 617 } 618 tp->t_lflag &= ~EXTPROC; 619 } 620 return(0); 621 } else 622 if (cdevsw[major(dev)].d_open == ptcopen) 623 switch (cmd) { 624 625 case TIOCGPGRP: 626 /* 627 * We aviod calling ttioctl on the controller since, 628 * in that case, tp must be the controlling terminal. 629 */ 630 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 631 return (0); 632 633 case TIOCPKT: 634 if (*(int *)data) { 635 if (pti->pt_flags & PF_UCNTL) 636 return (EINVAL); 637 pti->pt_flags |= PF_PKT; 638 } else 639 pti->pt_flags &= ~PF_PKT; 640 return (0); 641 642 case TIOCUCNTL: 643 if (*(int *)data) { 644 if (pti->pt_flags & PF_PKT) 645 return (EINVAL); 646 pti->pt_flags |= PF_UCNTL; 647 } else 648 pti->pt_flags &= ~PF_UCNTL; 649 return (0); 650 651 case TIOCREMOTE: 652 if (*(int *)data) 653 pti->pt_flags |= PF_REMOTE; 654 else 655 pti->pt_flags &= ~PF_REMOTE; 656 ttyflush(tp, FREAD|FWRITE); 657 return (0); 658 659#ifdef COMPAT_43 660 case TIOCSETP: 661 case TIOCSETN: 662#endif 663 case TIOCSETD: 664 case TIOCSETA: 665 case TIOCSETAW: 666 case TIOCSETAF: 667 ndflush(&tp->t_outq, tp->t_outq.c_cc); 668 break; 669 670 case TIOCSIG: 671 if (*(unsigned int *)data >= NSIG) 672 return(EINVAL); 673 if ((tp->t_lflag&NOFLSH) == 0) 674 ttyflush(tp, FREAD|FWRITE); 675 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 676 if ((*(unsigned int *)data == SIGINFO) && 677 ((tp->t_lflag&NOKERNINFO) == 0)) 678 ttyinfo(tp); 679 return(0); 680 } 681 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 682 if (error < 0) 683 error = ttioctl(tp, cmd, data, flag); 684 if (error < 0) { 685 if (pti->pt_flags & PF_UCNTL && 686 (cmd & ~0xff) == UIOCCMD(0)) { 687 if (cmd & 0xff) { 688 pti->pt_ucntl = (u_char)cmd; 689 ptcwakeup(tp, FREAD); 690 } 691 return (0); 692 } 693 error = ENOTTY; 694 } 695 /* 696 * If external processing and packet mode send ioctl packet. 697 */ 698 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 699 switch(cmd) { 700 case TIOCSETA: 701 case TIOCSETAW: 702 case TIOCSETAF: 703#ifdef COMPAT_43 704 case TIOCSETP: 705 case TIOCSETN: 706#endif 707#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 708 case TIOCSETC: 709 case TIOCSLTC: 710 case TIOCLBIS: 711 case TIOCLBIC: 712 case TIOCLSET: 713#endif 714 pti->pt_send |= TIOCPKT_IOCTL; 715 ptcwakeup(tp, FREAD); 716 default: 717 break; 718 } 719 } 720 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 721 && CCEQ(cc[VSTART], CTRL('q')); 722 if (pti->pt_flags & PF_NOSTOP) { 723 if (stop) { 724 pti->pt_send &= ~TIOCPKT_NOSTOP; 725 pti->pt_send |= TIOCPKT_DOSTOP; 726 pti->pt_flags &= ~PF_NOSTOP; 727 ptcwakeup(tp, FREAD); 728 } 729 } else { 730 if (!stop) { 731 pti->pt_send &= ~TIOCPKT_DOSTOP; 732 pti->pt_send |= TIOCPKT_NOSTOP; 733 pti->pt_flags |= PF_NOSTOP; 734 ptcwakeup(tp, FREAD); 735 } 736 } 737 return (error); 738} 739