Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/tty_pty.c
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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 1.39.2.2 1999/09/05 08:15:27 peter Exp $ 35 */ 36 37 /* 38 * Pseudo-teletype Driver 39 * (Actually two drivers, requiring two entries in 'cdevsw') 40 */ 41 #include "pty.h" /* XXX */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/ioctl.h> 46 #include <sys/proc.h> 47 #include <sys/tty.h> 48 #include <sys/conf.h> 49 #include <sys/file.h> 50 #include <sys/uio.h> 51 #include <sys/kernel.h> 52 #include <sys/vnode.h> 53 #include <sys/signalvar.h> 54 55 #ifdef DEVFS 56 #include <sys/devfsext.h> 57 #endif /*DEVFS*/ 58 59 #ifdef notyet 60 static void ptyattach __P((int n)); 61 #endif 62 static void ptsstart __P((struct tty *tp)); 63 static void ptcwakeup __P((struct tty *tp, int flag)); 64 65 static d_open_t ptsopen; 66 static d_close_t ptsclose; 67 static d_read_t ptsread; 68 static d_write_t ptswrite; 69 static d_ioctl_t ptyioctl; 70 static d_stop_t ptsstop; 71 static d_devtotty_t ptydevtotty; 72 static d_open_t ptcopen; 73 static d_close_t ptcclose; 74 static d_read_t ptcread; 75 static d_write_t ptcwrite; 76 static d_select_t ptcselect; 77 78 #define CDEV_MAJOR_S 5 79 #define CDEV_MAJOR_C 6 80 static struct cdevsw pts_cdevsw = 81 { ptsopen, ptsclose, ptsread, ptswrite, /*5*/ 82 ptyioctl, ptsstop, nullreset, ptydevtotty,/* ttyp */ 83 ttselect, nommap, NULL, "pts", NULL, -1 }; 84 85 static struct cdevsw ptc_cdevsw = 86 { ptcopen, ptcclose, ptcread, ptcwrite, /*6*/ 87 ptyioctl, nullstop, nullreset, ptydevtotty,/* ptyp */ 88 ptcselect, nommap, NULL, "ptc", NULL, -1 }; 89 90 91 #if NPTY == 1 92 #undef NPTY 93 #define NPTY 32 /* crude XXX */ 94 #warning You have only one pty defined, redefining to 32. 95 #endif 96 97 #ifdef DEVFS 98 #define MAXUNITS (8 * 32) 99 static void *devfs_token_pts[MAXUNITS]; 100 static void *devfs_token_ptc[MAXUNITS]; 101 static const char jnames[] = "pqrsPQRS"; 102 #if NPTY > MAXUNITS 103 #undef NPTY 104 #define NPTY MAXUNITS 105 #warning Can't have more than 256 pty's with DEVFS defined. 106 #endif 107 #endif 108 109 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 110 111 /* 112 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 113 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 114 */ 115 static struct tty pt_tty[NPTY]; /* XXX */ 116 static 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 } pt_ioctl[NPTY]; /* XXX */ 122 static int npty = NPTY; /* for pstat -t */ 123 124 #define PF_PKT 0x08 /* packet mode */ 125 #define PF_STOPPED 0x10 /* user told stopped */ 126 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 127 #define PF_NOSTOP 0x40 128 #define PF_UCNTL 0x80 /* user control mode */ 129 130 #ifdef notyet 131 /* 132 * Establish n (or default if n is 1) ptys in the system. 133 * 134 * XXX cdevsw & pstat require the array `pty[]' to be an array 135 */ 136 static void 137 ptyattach(n) 138 int n; 139 { 140 char *mem; 141 register u_long ntb; 142 #define DEFAULT_NPTY 32 143 144 /* maybe should allow 0 => none? */ 145 if (n <= 1) 146 n = DEFAULT_NPTY; 147 ntb = n * sizeof(struct tty); 148 mem = malloc(ntb + ALIGNBYTES + n * sizeof(struct pt_ioctl), 149 M_DEVBUF, M_WAITOK); 150 pt_tty = (struct tty *)mem; 151 mem = (char *)ALIGN(mem + ntb); 152 pt_ioctl = (struct pt_ioctl *)mem; 153 npty = n; 154 } 155 #endif 156 157 /*ARGSUSED*/ 158 static int 159 ptsopen(dev, flag, devtype, p) 160 dev_t dev; 161 int flag, devtype; 162 struct proc *p; 163 { 164 register struct tty *tp; 165 int error; 166 167 if (minor(dev) >= npty) 168 return (ENXIO); 169 tp = &pt_tty[minor(dev)]; 170 if ((tp->t_state & TS_ISOPEN) == 0) { 171 ttychars(tp); /* Set up default chars */ 172 tp->t_iflag = TTYDEF_IFLAG; 173 tp->t_oflag = TTYDEF_OFLAG; 174 tp->t_lflag = TTYDEF_LFLAG; 175 tp->t_cflag = TTYDEF_CFLAG; 176 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 177 ttsetwater(tp); /* would be done in xxparam() */ 178 } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) 179 return (EBUSY); 180 if (tp->t_oproc) /* Ctrlr still around. */ 181 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 182 while ((tp->t_state & TS_CARR_ON) == 0) { 183 if (flag&FNONBLOCK) 184 break; 185 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 186 "ptsopn", 0); 187 if (error) 188 return (error); 189 } 190 error = (*linesw[tp->t_line].l_open)(dev, tp); 191 if (error == 0) 192 ptcwakeup(tp, FREAD|FWRITE); 193 return (error); 194 } 195 196 static int 197 ptsclose(dev, flag, mode, p) 198 dev_t dev; 199 int flag, mode; 200 struct proc *p; 201 { 202 register struct tty *tp; 203 int err; 204 205 tp = &pt_tty[minor(dev)]; 206 err = (*linesw[tp->t_line].l_close)(tp, flag); 207 ptsstop(tp, FREAD|FWRITE); 208 (void) ttyclose(tp); 209 return (err); 210 } 211 212 static int 213 ptsread(dev, uio, flag) 214 dev_t dev; 215 struct uio *uio; 216 int flag; 217 { 218 struct proc *p = curproc; 219 register struct tty *tp = &pt_tty[minor(dev)]; 220 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 221 int error = 0; 222 223 again: 224 if (pti->pt_flags & PF_REMOTE) { 225 while (isbackground(p, tp)) { 226 if ((p->p_sigignore & sigmask(SIGTTIN)) || 227 (p->p_sigmask & sigmask(SIGTTIN)) || 228 p->p_pgrp->pg_jobc == 0 || 229 p->p_flag & P_PPWAIT) 230 return (EIO); 231 pgsignal(p->p_pgrp, SIGTTIN, 1); 232 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 233 0); 234 if (error) 235 return (error); 236 } 237 if (tp->t_canq.c_cc == 0) { 238 if (flag & IO_NDELAY) 239 return (EWOULDBLOCK); 240 error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 241 "ptsin", 0); 242 if (error) 243 return (error); 244 goto again; 245 } 246 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 247 if (ureadc(getc(&tp->t_canq), uio) < 0) { 248 error = EFAULT; 249 break; 250 } 251 if (tp->t_canq.c_cc == 1) 252 (void) getc(&tp->t_canq); 253 if (tp->t_canq.c_cc) 254 return (error); 255 } else 256 if (tp->t_oproc) 257 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 258 ptcwakeup(tp, FWRITE); 259 return (error); 260 } 261 262 /* 263 * Write to pseudo-tty. 264 * Wakeups of controlling tty will happen 265 * indirectly, when tty driver calls ptsstart. 266 */ 267 static int 268 ptswrite(dev, uio, flag) 269 dev_t dev; 270 struct uio *uio; 271 int flag; 272 { 273 register struct tty *tp; 274 275 tp = &pt_tty[minor(dev)]; 276 if (tp->t_oproc == 0) 277 return (EIO); 278 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 279 } 280 281 /* 282 * Start output on pseudo-tty. 283 * Wake up process selecting or sleeping for input from controlling tty. 284 */ 285 static void 286 ptsstart(tp) 287 struct tty *tp; 288 { 289 register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 290 291 if (tp->t_state & TS_TTSTOP) 292 return; 293 if (pti->pt_flags & PF_STOPPED) { 294 pti->pt_flags &= ~PF_STOPPED; 295 pti->pt_send = TIOCPKT_START; 296 } 297 ptcwakeup(tp, FREAD); 298 } 299 300 static void 301 ptcwakeup(tp, flag) 302 struct tty *tp; 303 int flag; 304 { 305 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 306 307 if (flag & FREAD) { 308 selwakeup(&pti->pt_selr); 309 wakeup(TSA_PTC_READ(tp)); 310 } 311 if (flag & FWRITE) { 312 selwakeup(&pti->pt_selw); 313 wakeup(TSA_PTC_WRITE(tp)); 314 } 315 } 316 317 static int 318 ptcopen(dev, flag, devtype, p) 319 dev_t dev; 320 int flag, devtype; 321 struct proc *p; 322 { 323 register struct tty *tp; 324 struct pt_ioctl *pti; 325 326 if (minor(dev) >= npty) 327 return (ENXIO); 328 tp = &pt_tty[minor(dev)]; 329 if (tp->t_oproc) 330 return (EIO); 331 tp->t_oproc = ptsstart; 332 #ifdef sun4c 333 tp->t_stop = ptsstop; 334 #endif 335 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 336 tp->t_lflag &= ~EXTPROC; 337 pti = &pt_ioctl[minor(dev)]; 338 pti->pt_flags = 0; 339 pti->pt_send = 0; 340 pti->pt_ucntl = 0; 341 return (0); 342 } 343 344 static int 345 ptcclose(dev, flags, fmt, p) 346 dev_t dev; 347 int flags; 348 int fmt; 349 struct proc *p; 350 { 351 register struct tty *tp; 352 353 tp = &pt_tty[minor(dev)]; 354 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 355 356 /* 357 * XXX MDMBUF makes no sense for ptys but would inhibit the above 358 * l_modem(). CLOCAL makes sense but isn't supported. Special 359 * l_modem()s that ignore carrier drop make no sense for ptys but 360 * may be in use because other parts of the line discipline make 361 * sense for ptys. Recover by doing everything that a normal 362 * ttymodem() would have done except for sending a SIGHUP. 363 */ 364 if (tp->t_state & TS_ISOPEN) { 365 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 366 tp->t_state |= TS_ZOMBIE; 367 ttyflush(tp, FREAD | FWRITE); 368 } 369 370 tp->t_oproc = 0; /* mark closed */ 371 return (0); 372 } 373 374 static int 375 ptcread(dev, uio, flag) 376 dev_t dev; 377 struct uio *uio; 378 int flag; 379 { 380 register struct tty *tp = &pt_tty[minor(dev)]; 381 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 382 char buf[BUFSIZ]; 383 int error = 0, cc; 384 385 /* 386 * We want to block until the slave 387 * is open, and there's something to read; 388 * but if we lost the slave or we're NBIO, 389 * then return the appropriate error instead. 390 */ 391 for (;;) { 392 if (tp->t_state&TS_ISOPEN) { 393 if (pti->pt_flags&PF_PKT && pti->pt_send) { 394 error = ureadc((int)pti->pt_send, uio); 395 if (error) 396 return (error); 397 if (pti->pt_send & TIOCPKT_IOCTL) { 398 cc = min(uio->uio_resid, 399 sizeof(tp->t_termios)); 400 uiomove((caddr_t)&tp->t_termios, cc, 401 uio); 402 } 403 pti->pt_send = 0; 404 return (0); 405 } 406 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 407 error = ureadc((int)pti->pt_ucntl, uio); 408 if (error) 409 return (error); 410 pti->pt_ucntl = 0; 411 return (0); 412 } 413 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 414 break; 415 } 416 if ((tp->t_state & TS_CONNECTED) == 0) 417 return (0); /* EOF */ 418 if (flag & IO_NDELAY) 419 return (EWOULDBLOCK); 420 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 421 if (error) 422 return (error); 423 } 424 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 425 error = ureadc(0, uio); 426 while (uio->uio_resid > 0 && error == 0) { 427 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 428 if (cc <= 0) 429 break; 430 error = uiomove(buf, cc, uio); 431 } 432 ttwwakeup(tp); 433 return (error); 434 } 435 436 static void 437 ptsstop(tp, flush) 438 register struct tty *tp; 439 int flush; 440 { 441 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 442 int flag; 443 444 /* note: FLUSHREAD and FLUSHWRITE already ok */ 445 if (flush == 0) { 446 flush = TIOCPKT_STOP; 447 pti->pt_flags |= PF_STOPPED; 448 } else 449 pti->pt_flags &= ~PF_STOPPED; 450 pti->pt_send |= flush; 451 /* change of perspective */ 452 flag = 0; 453 if (flush & FREAD) 454 flag |= FWRITE; 455 if (flush & FWRITE) 456 flag |= FREAD; 457 ptcwakeup(tp, flag); 458 } 459 460 static int 461 ptcselect(dev, rw, p) 462 dev_t dev; 463 int rw; 464 struct proc *p; 465 { 466 register struct tty *tp = &pt_tty[minor(dev)]; 467 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 468 int s; 469 470 if ((tp->t_state & TS_CONNECTED) == 0) 471 return (1); 472 switch (rw) { 473 474 case FREAD: 475 /* 476 * Need to block timeouts (ttrstart). 477 */ 478 s = spltty(); 479 if ((tp->t_state&TS_ISOPEN) && 480 tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { 481 splx(s); 482 return (1); 483 } 484 splx(s); 485 /* FALLTHROUGH */ 486 487 case 0: /* exceptional */ 488 if ((tp->t_state&TS_ISOPEN) && 489 ((pti->pt_flags&PF_PKT && pti->pt_send) || 490 (pti->pt_flags&PF_UCNTL && pti->pt_ucntl))) 491 return (1); 492 selrecord(p, &pti->pt_selr); 493 break; 494 495 496 case FWRITE: 497 if (tp->t_state&TS_ISOPEN) { 498 if (pti->pt_flags & PF_REMOTE) { 499 if (tp->t_canq.c_cc == 0) 500 return (1); 501 } else { 502 if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 503 return (1); 504 if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON)) 505 return (1); 506 } 507 } 508 selrecord(p, &pti->pt_selw); 509 break; 510 511 } 512 return (0); 513 } 514 515 static int 516 ptcwrite(dev, uio, flag) 517 dev_t dev; 518 register struct uio *uio; 519 int flag; 520 { 521 register struct tty *tp = &pt_tty[minor(dev)]; 522 register u_char *cp = 0; 523 register int cc = 0; 524 u_char locbuf[BUFSIZ]; 525 int cnt = 0; 526 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 527 int error = 0; 528 529 again: 530 if ((tp->t_state&TS_ISOPEN) == 0) 531 goto block; 532 if (pti->pt_flags & PF_REMOTE) { 533 if (tp->t_canq.c_cc) 534 goto block; 535 while ((uio->uio_resid > 0 || cc > 0) && 536 tp->t_canq.c_cc < TTYHOG - 1) { 537 if (cc == 0) { 538 cc = min(uio->uio_resid, BUFSIZ); 539 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 540 cp = locbuf; 541 error = uiomove((caddr_t)cp, cc, uio); 542 if (error) 543 return (error); 544 /* check again for safety */ 545 if ((tp->t_state & TS_ISOPEN) == 0) { 546 /* adjust as usual */ 547 uio->uio_resid += cc; 548 return (EIO); 549 } 550 } 551 if (cc > 0) { 552 cc = b_to_q((char *)cp, cc, &tp->t_canq); 553 /* 554 * XXX we don't guarantee that the canq size 555 * is >= TTYHOG, so the above b_to_q() may 556 * leave some bytes uncopied. However, space 557 * is guaranteed for the null terminator if 558 * we don't fail here since (TTYHOG - 1) is 559 * not a multiple of CBSIZE. 560 */ 561 if (cc > 0) 562 break; 563 } 564 } 565 /* adjust for data copied in but not written */ 566 uio->uio_resid += cc; 567 (void) putc(0, &tp->t_canq); 568 ttwakeup(tp); 569 wakeup(TSA_PTS_READ(tp)); 570 return (0); 571 } 572 while (uio->uio_resid > 0 || cc > 0) { 573 if (cc == 0) { 574 cc = min(uio->uio_resid, BUFSIZ); 575 cp = locbuf; 576 error = uiomove((caddr_t)cp, cc, uio); 577 if (error) 578 return (error); 579 /* check again for safety */ 580 if ((tp->t_state & TS_ISOPEN) == 0) { 581 /* adjust for data copied in but not written */ 582 uio->uio_resid += cc; 583 return (EIO); 584 } 585 } 586 while (cc > 0) { 587 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 588 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 589 wakeup(TSA_HUP_OR_INPUT(tp)); 590 goto block; 591 } 592 (*linesw[tp->t_line].l_rint)(*cp++, tp); 593 cnt++; 594 cc--; 595 } 596 cc = 0; 597 } 598 return (0); 599 block: 600 /* 601 * Come here to wait for slave to open, for space 602 * in outq, or space in rawq, or an empty canq. 603 */ 604 if ((tp->t_state & TS_CONNECTED) == 0) { 605 /* adjust for data copied in but not written */ 606 uio->uio_resid += cc; 607 return (EIO); 608 } 609 if (flag & IO_NDELAY) { 610 /* adjust for data copied in but not written */ 611 uio->uio_resid += cc; 612 if (cnt == 0) 613 return (EWOULDBLOCK); 614 return (0); 615 } 616 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 617 if (error) { 618 /* adjust for data copied in but not written */ 619 uio->uio_resid += cc; 620 return (error); 621 } 622 goto again; 623 } 624 625 static struct tty * 626 ptydevtotty(dev) 627 dev_t dev; 628 { 629 if (minor(dev) >= npty) 630 return (NULL); 631 632 return &pt_tty[minor(dev)]; 633 } 634 635 /*ARGSUSED*/ 636 static int 637 ptyioctl(dev, cmd, data, flag, p) 638 dev_t dev; 639 int cmd; 640 caddr_t data; 641 int flag; 642 struct proc *p; 643 { 644 register struct tty *tp = &pt_tty[minor(dev)]; 645 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 646 register u_char *cc = tp->t_cc; 647 int stop, error; 648 649 /* 650 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 651 * ttywflush(tp) will hang if there are characters in the outq. 652 */ 653 if (cmd == TIOCEXT) { 654 /* 655 * When the EXTPROC bit is being toggled, we need 656 * to send an TIOCPKT_IOCTL if the packet driver 657 * is turned on. 658 */ 659 if (*(int *)data) { 660 if (pti->pt_flags & PF_PKT) { 661 pti->pt_send |= TIOCPKT_IOCTL; 662 ptcwakeup(tp, FREAD); 663 } 664 tp->t_lflag |= EXTPROC; 665 } else { 666 if ((tp->t_lflag & EXTPROC) && 667 (pti->pt_flags & PF_PKT)) { 668 pti->pt_send |= TIOCPKT_IOCTL; 669 ptcwakeup(tp, FREAD); 670 } 671 tp->t_lflag &= ~EXTPROC; 672 } 673 return(0); 674 } else 675 if (cdevsw[major(dev)]->d_open == ptcopen) 676 switch (cmd) { 677 678 case TIOCGPGRP: 679 /* 680 * We aviod calling ttioctl on the controller since, 681 * in that case, tp must be the controlling terminal. 682 */ 683 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 684 return (0); 685 686 case TIOCPKT: 687 if (*(int *)data) { 688 if (pti->pt_flags & PF_UCNTL) 689 return (EINVAL); 690 pti->pt_flags |= PF_PKT; 691 } else 692 pti->pt_flags &= ~PF_PKT; 693 return (0); 694 695 case TIOCUCNTL: 696 if (*(int *)data) { 697 if (pti->pt_flags & PF_PKT) 698 return (EINVAL); 699 pti->pt_flags |= PF_UCNTL; 700 } else 701 pti->pt_flags &= ~PF_UCNTL; 702 return (0); 703 704 case TIOCREMOTE: 705 if (*(int *)data) 706 pti->pt_flags |= PF_REMOTE; 707 else 708 pti->pt_flags &= ~PF_REMOTE; 709 ttyflush(tp, FREAD|FWRITE); 710 return (0); 711 712 #ifdef COMPAT_43 713 case TIOCSETP: 714 case TIOCSETN: 715 #endif 716 case TIOCSETD: 717 case TIOCSETA: 718 case TIOCSETAW: 719 case TIOCSETAF: 720 ndflush(&tp->t_outq, tp->t_outq.c_cc); 721 break; 722 723 case TIOCSIG: 724 if (*(unsigned int *)data >= NSIG || 725 *(unsigned int *)data == 0) 726 return(EINVAL); 727 if ((tp->t_lflag&NOFLSH) == 0) 728 ttyflush(tp, FREAD|FWRITE); 729 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 730 if ((*(unsigned int *)data == SIGINFO) && 731 ((tp->t_lflag&NOKERNINFO) == 0)) 732 ttyinfo(tp); 733 return(0); 734 } 735 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 736 if (error < 0) 737 error = ttioctl(tp, cmd, data, flag); 738 if (error < 0) { 739 if (pti->pt_flags & PF_UCNTL && 740 (cmd & ~0xff) == UIOCCMD(0)) { 741 if (cmd & 0xff) { 742 pti->pt_ucntl = (u_char)cmd; 743 ptcwakeup(tp, FREAD); 744 } 745 return (0); 746 } 747 error = ENOTTY; 748 } 749 /* 750 * If external processing and packet mode send ioctl packet. 751 */ 752 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 753 switch(cmd) { 754 case TIOCSETA: 755 case TIOCSETAW: 756 case TIOCSETAF: 757 #ifdef COMPAT_43 758 case TIOCSETP: 759 case TIOCSETN: 760 #endif 761 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 762 case TIOCSETC: 763 case TIOCSLTC: 764 case TIOCLBIS: 765 case TIOCLBIC: 766 case TIOCLSET: 767 #endif 768 pti->pt_send |= TIOCPKT_IOCTL; 769 ptcwakeup(tp, FREAD); 770 default: 771 break; 772 } 773 } 774 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 775 && CCEQ(cc[VSTART], CTRL('q')); 776 if (pti->pt_flags & PF_NOSTOP) { 777 if (stop) { 778 pti->pt_send &= ~TIOCPKT_NOSTOP; 779 pti->pt_send |= TIOCPKT_DOSTOP; 780 pti->pt_flags &= ~PF_NOSTOP; 781 ptcwakeup(tp, FREAD); 782 } 783 } else { 784 if (!stop) { 785 pti->pt_send &= ~TIOCPKT_DOSTOP; 786 pti->pt_send |= TIOCPKT_NOSTOP; 787 pti->pt_flags |= PF_NOSTOP; 788 ptcwakeup(tp, FREAD); 789 } 790 } 791 return (error); 792 } 793 794 static ptc_devsw_installed = 0; 795 796 static void 797 ptc_drvinit(void *unused) 798 { 799 #ifdef DEVFS 800 int i,j,k; 801 #endif 802 dev_t dev; 803 804 if( ! ptc_devsw_installed ) { 805 dev = makedev(CDEV_MAJOR_S, 0); 806 cdevsw_add(&dev, &pts_cdevsw, NULL); 807 dev = makedev(CDEV_MAJOR_C, 0); 808 cdevsw_add(&dev, &ptc_cdevsw, NULL); 809 ptc_devsw_installed = 1; 810 #ifdef DEVFS 811 for ( i = 0 ; i<NPTY ; i++ ) { 812 j = i / 32; 813 k = i % 32; 814 devfs_token_pts[i] = 815 devfs_add_devswf(&pts_cdevsw,i, 816 DV_CHR,0,0,0666, 817 "tty%c%n",jnames[j],k); 818 devfs_token_ptc[i] = 819 devfs_add_devswf(&ptc_cdevsw,i, 820 DV_CHR,0,0,0666, 821 "pty%c%n",jnames[j],k); 822 } 823 #endif 824 } 825 } 826 827 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)
Cache object: 38c86be03d7fdcd0603aa9fa75e3981e
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