| 1 | /* |
| 2 | * Copyright (c) 1982, 1986, 1989 The Regents of the University of California. |
| 3 | * 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 7.21 (Berkeley) 5/30/91 |
| 34 | */ |
| 35 | static char rcsid[] = "$Header: /usr/bill/working/sys/kern/RCS/tty_pty.c,v 1.3 92/01/21 21:31:23 william Exp $"; |
| 36 | |
| 37 | /* |
| 38 | * Pseudo-teletype Driver |
| 39 | * (Actually two drivers, requiring two entries in 'cdevsw') |
| 40 | */ |
| 41 | #include "pty.h" |
| 42 | |
| 43 | #if NPTY > 0 |
| 44 | #include "param.h" |
| 45 | #include "systm.h" |
| 46 | #include "ioctl.h" |
| 47 | #include "tty.h" |
| 48 | #include "conf.h" |
| 49 | #include "file.h" |
| 50 | #include "proc.h" |
| 51 | #include "uio.h" |
| 52 | #include "kernel.h" |
| 53 | #include "vnode.h" |
| 54 | |
| 55 | #if NPTY == 1 |
| 56 | #undef NPTY |
| 57 | #define NPTY 32 /* crude XXX */ |
| 58 | #endif |
| 59 | |
| 60 | #define BUFSIZ 100 /* Chunk size iomoved to/from user */ |
| 61 | |
| 62 | /* |
| 63 | * pts == /dev/tty[pqrs]? |
| 64 | * ptc == /dev/pty[pqrs]? |
| 65 | */ |
| 66 | struct tty pt_tty[NPTY]; |
| 67 | struct pt_ioctl { |
| 68 | int pt_flags; |
| 69 | struct proc *pt_selr, *pt_selw; |
| 70 | u_char pt_send; |
| 71 | u_char pt_ucntl; |
| 72 | } pt_ioctl[NPTY]; |
| 73 | int npty = NPTY; /* for pstat -t */ |
| 74 | |
| 75 | #define PF_RCOLL 0x01 |
| 76 | #define PF_WCOLL 0x02 |
| 77 | #define PF_PKT 0x08 /* packet mode */ |
| 78 | #define PF_STOPPED 0x10 /* user told stopped */ |
| 79 | #define PF_REMOTE 0x20 /* remote and flow controlled input */ |
| 80 | #define PF_NOSTOP 0x40 |
| 81 | #define PF_UCNTL 0x80 /* user control mode */ |
| 82 | |
| 83 | /*ARGSUSED*/ |
| 84 | ptsopen(dev, flag, devtype, p) |
| 85 | dev_t dev; |
| 86 | struct proc *p; |
| 87 | { |
| 88 | register struct tty *tp; |
| 89 | int error; |
| 90 | |
| 91 | #ifdef lint |
| 92 | npty = npty; |
| 93 | #endif |
| 94 | if (minor(dev) >= NPTY) |
| 95 | return (ENXIO); |
| 96 | tp = &pt_tty[minor(dev)]; |
| 97 | if ((tp->t_state & TS_ISOPEN) == 0) { |
| 98 | tp->t_state |= TS_WOPEN; |
| 99 | ttychars(tp); /* Set up default chars */ |
| 100 | tp->t_iflag = TTYDEF_IFLAG; |
| 101 | tp->t_oflag = TTYDEF_OFLAG; |
| 102 | tp->t_lflag = TTYDEF_LFLAG; |
| 103 | tp->t_cflag = TTYDEF_CFLAG; |
| 104 | tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; |
| 105 | ttsetwater(tp); /* would be done in xxparam() */ |
| 106 | } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) |
| 107 | return (EBUSY); |
| 108 | if (tp->t_oproc) /* Ctrlr still around. */ |
| 109 | tp->t_state |= TS_CARR_ON; |
| 110 | while ((tp->t_state & TS_CARR_ON) == 0) { |
| 111 | tp->t_state |= TS_WOPEN; |
| 112 | if (flag&FNONBLOCK) |
| 113 | break; |
| 114 | if (error = ttysleep(tp, (caddr_t)&tp->t_raw, TTIPRI | PCATCH, |
| 115 | ttopen, 0)) |
| 116 | return (error); |
| 117 | } |
| 118 | error = (*linesw[tp->t_line].l_open)(dev, tp, flag); |
| 119 | ptcwakeup(tp, FREAD|FWRITE); |
| 120 | return (error); |
| 121 | } |
| 122 | |
| 123 | ptsclose(dev, flag, mode, p) |
| 124 | dev_t dev; |
| 125 | int flag, mode; |
| 126 | struct proc *p; |
| 127 | { |
| 128 | register struct tty *tp; |
| 129 | |
| 130 | tp = &pt_tty[minor(dev)]; |
| 131 | (*linesw[tp->t_line].l_close)(tp, flag); |
| 132 | ttyclose(tp); |
| 133 | ptcwakeup(tp, FREAD|FWRITE); |
| 134 | } |
| 135 | |
| 136 | ptsread(dev, uio, flag) |
| 137 | dev_t dev; |
| 138 | struct uio *uio; |
| 139 | { |
| 140 | struct proc *p = curproc; |
| 141 | register struct tty *tp = &pt_tty[minor(dev)]; |
| 142 | register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; |
| 143 | int error = 0; |
| 144 | |
| 145 | again: |
| 146 | if (pti->pt_flags & PF_REMOTE) { |
| 147 | while (isbackground(p, tp)) { |
| 148 | if ((p->p_sigignore & sigmask(SIGTTIN)) || |
| 149 | (p->p_sigmask & sigmask(SIGTTIN)) || |
| 150 | p->p_pgrp->pg_jobc == 0 || |
| 151 | p->p_flag&SPPWAIT) |
| 152 | return (EIO); |
| 153 | pgsignal(p->p_pgrp, SIGTTIN, 1); |
| 154 | if (error = ttysleep(tp, (caddr_t)&lbolt, |
| 155 | TTIPRI | PCATCH, ttybg, 0)) |
| 156 | return (error); |
| 157 | } |
| 158 | if (RB_LEN(&tp->t_can) == 0) { |
| 159 | if (flag & IO_NDELAY) |
| 160 | return (EWOULDBLOCK); |
| 161 | if (error = ttysleep(tp, (caddr_t)&tp->t_can, |
| 162 | TTIPRI | PCATCH, ttyin, 0)) |
| 163 | return (error); |
| 164 | goto again; |
| 165 | } |
| 166 | while (RB_LEN(&tp->t_can) > 1 && uio->uio_resid > 0) |
| 167 | if (ureadc(getc(&tp->t_can), uio) < 0) { |
| 168 | error = EFAULT; |
| 169 | break; |
| 170 | } |
| 171 | if (RB_LEN(&tp->t_can) == 1) |
| 172 | (void) getc(&tp->t_can); |
| 173 | if (RB_LEN(&tp->t_can)) |
| 174 | return (error); |
| 175 | } else |
| 176 | if (tp->t_oproc) |
| 177 | error = (*linesw[tp->t_line].l_read)(tp, uio, flag); |
| 178 | ptcwakeup(tp, FWRITE); |
| 179 | return (error); |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Write to pseudo-tty. |
| 184 | * Wakeups of controlling tty will happen |
| 185 | * indirectly, when tty driver calls ptsstart. |
| 186 | */ |
| 187 | ptswrite(dev, uio, flag) |
| 188 | dev_t dev; |
| 189 | struct uio *uio; |
| 190 | { |
| 191 | register struct tty *tp; |
| 192 | |
| 193 | tp = &pt_tty[minor(dev)]; |
| 194 | if (tp->t_oproc == 0) |
| 195 | return (EIO); |
| 196 | return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * Start output on pseudo-tty. |
| 201 | * Wake up process selecting or sleeping for input from controlling tty. |
| 202 | */ |
| 203 | ptsstart(tp) |
| 204 | struct tty *tp; |
| 205 | { |
| 206 | register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; |
| 207 | |
| 208 | if (tp->t_state & TS_TTSTOP) |
| 209 | return; |
| 210 | if (pti->pt_flags & PF_STOPPED) { |
| 211 | pti->pt_flags &= ~PF_STOPPED; |
| 212 | pti->pt_send = TIOCPKT_START; |
| 213 | } |
| 214 | ptcwakeup(tp, FREAD); |
| 215 | } |
| 216 | |
| 217 | ptcwakeup(tp, flag) |
| 218 | struct tty *tp; |
| 219 | { |
| 220 | struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; |
| 221 | |
| 222 | if (flag & FREAD) { |
| 223 | if (pti->pt_selr) { |
| 224 | selwakeup(pti->pt_selr, pti->pt_flags & PF_RCOLL); |
| 225 | pti->pt_selr = 0; |
| 226 | pti->pt_flags &= ~PF_RCOLL; |
| 227 | } |
| 228 | wakeup((caddr_t)&tp->t_out.rb_hd); |
| 229 | } |
| 230 | if (flag & FWRITE) { |
| 231 | if (pti->pt_selw) { |
| 232 | selwakeup(pti->pt_selw, pti->pt_flags & PF_WCOLL); |
| 233 | pti->pt_selw = 0; |
| 234 | pti->pt_flags &= ~PF_WCOLL; |
| 235 | } |
| 236 | wakeup((caddr_t)&tp->t_raw.rb_hd); |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | /*ARGSUSED*/ |
| 241 | #ifdef __STDC__ |
| 242 | ptcopen(dev_t dev, int flag, int devtype, struct proc *p) |
| 243 | #else |
| 244 | ptcopen(dev, flag, devtype, p) |
| 245 | dev_t dev; |
| 246 | int flag, devtype; |
| 247 | struct proc *p; |
| 248 | #endif |
| 249 | { |
| 250 | register struct tty *tp; |
| 251 | struct pt_ioctl *pti; |
| 252 | |
| 253 | if (minor(dev) >= NPTY) |
| 254 | return (ENXIO); |
| 255 | tp = &pt_tty[minor(dev)]; |
| 256 | if (tp->t_oproc) |
| 257 | return (EIO); |
| 258 | tp->t_oproc = ptsstart; |
| 259 | (void)(*linesw[tp->t_line].l_modem)(tp, 1); |
| 260 | tp->t_lflag &= ~EXTPROC; |
| 261 | pti = &pt_ioctl[minor(dev)]; |
| 262 | pti->pt_flags = 0; |
| 263 | pti->pt_send = 0; |
| 264 | pti->pt_ucntl = 0; |
| 265 | return (0); |
| 266 | } |
| 267 | |
| 268 | ptcclose(dev) |
| 269 | dev_t dev; |
| 270 | { |
| 271 | register struct tty *tp; |
| 272 | |
| 273 | tp = &pt_tty[minor(dev)]; |
| 274 | (void)(*linesw[tp->t_line].l_modem)(tp, 0); |
| 275 | tp->t_state &= ~TS_CARR_ON; |
| 276 | tp->t_oproc = 0; /* mark closed */ |
| 277 | tp->t_session = 0; |
| 278 | } |
| 279 | |
| 280 | ptcread(dev, uio, flag) |
| 281 | dev_t dev; |
| 282 | struct uio *uio; |
| 283 | { |
| 284 | register struct tty *tp = &pt_tty[minor(dev)]; |
| 285 | struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; |
| 286 | char buf[BUFSIZ]; |
| 287 | int error = 0, cc; |
| 288 | |
| 289 | /* |
| 290 | * We want to block until the slave |
| 291 | * is open, and there's something to read; |
| 292 | * but if we lost the slave or we're NBIO, |
| 293 | * then return the appropriate error instead. |
| 294 | */ |
| 295 | for (;;) { |
| 296 | if (tp->t_state&TS_ISOPEN) { |
| 297 | if (pti->pt_flags&PF_PKT && pti->pt_send) { |
| 298 | error = ureadc((int)pti->pt_send, uio); |
| 299 | if (error) |
| 300 | return (error); |
| 301 | if (pti->pt_send & TIOCPKT_IOCTL) { |
| 302 | cc = MIN(uio->uio_resid, |
| 303 | sizeof(tp->t_termios)); |
| 304 | uiomove(&tp->t_termios, cc, uio); |
| 305 | } |
| 306 | pti->pt_send = 0; |
| 307 | return (0); |
| 308 | } |
| 309 | if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { |
| 310 | error = ureadc((int)pti->pt_ucntl, uio); |
| 311 | if (error) |
| 312 | return (error); |
| 313 | pti->pt_ucntl = 0; |
| 314 | return (0); |
| 315 | } |
| 316 | if (RB_LEN(&tp->t_out) && (tp->t_state&TS_TTSTOP) == 0) |
| 317 | break; |
| 318 | } |
| 319 | if ((tp->t_state&TS_CARR_ON) == 0) |
| 320 | return (0); /* EOF */ |
| 321 | if (flag & IO_NDELAY) |
| 322 | return (EWOULDBLOCK); |
| 323 | if (error = tsleep((caddr_t)&tp->t_out.rb_hd, TTIPRI | PCATCH, |
| 324 | ttyin, 0)) |
| 325 | return (error); |
| 326 | } |
| 327 | if (pti->pt_flags & (PF_PKT|PF_UCNTL)) |
| 328 | error = ureadc(0, uio); |
| 329 | while (uio->uio_resid > 0 && error == 0) { |
| 330 | #ifdef was |
| 331 | cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ)); |
| 332 | #else |
| 333 | cc = min(MIN(uio->uio_resid, BUFSIZ), RB_CONTIGGET(&tp->t_out)); |
| 334 | if (cc) { |
| 335 | bcopy(tp->t_out.rb_hd, buf, cc); |
| 336 | tp->t_out.rb_hd = |
| 337 | RB_ROLLOVER(&tp->t_out, tp->t_out.rb_hd+cc); |
| 338 | } |
| 339 | #endif |
| 340 | if (cc <= 0) |
| 341 | break; |
| 342 | error = uiomove(buf, cc, uio); |
| 343 | } |
| 344 | if (RB_LEN(&tp->t_out) <= tp->t_lowat) { |
| 345 | if (tp->t_state&TS_ASLEEP) { |
| 346 | tp->t_state &= ~TS_ASLEEP; |
| 347 | wakeup((caddr_t)&tp->t_out); |
| 348 | } |
| 349 | if (tp->t_wsel) { |
| 350 | selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL); |
| 351 | tp->t_wsel = 0; |
| 352 | tp->t_state &= ~TS_WCOLL; |
| 353 | } |
| 354 | } |
| 355 | return (error); |
| 356 | } |
| 357 | |
| 358 | ptsstop(tp, flush) |
| 359 | register struct tty *tp; |
| 360 | int flush; |
| 361 | { |
| 362 | struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; |
| 363 | int flag; |
| 364 | |
| 365 | /* note: FLUSHREAD and FLUSHWRITE already ok */ |
| 366 | if (flush == 0) { |
| 367 | flush = TIOCPKT_STOP; |
| 368 | pti->pt_flags |= PF_STOPPED; |
| 369 | } else |
| 370 | pti->pt_flags &= ~PF_STOPPED; |
| 371 | pti->pt_send |= flush; |
| 372 | /* change of perspective */ |
| 373 | flag = 0; |
| 374 | if (flush & FREAD) |
| 375 | flag |= FWRITE; |
| 376 | if (flush & FWRITE) |
| 377 | flag |= FREAD; |
| 378 | ptcwakeup(tp, flag); |
| 379 | } |
| 380 | |
| 381 | ptcselect(dev, rw, p) |
| 382 | dev_t dev; |
| 383 | int rw; |
| 384 | struct proc *p; |
| 385 | { |
| 386 | register struct tty *tp = &pt_tty[minor(dev)]; |
| 387 | struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; |
| 388 | struct proc *prev; |
| 389 | int s; |
| 390 | |
| 391 | if ((tp->t_state&TS_CARR_ON) == 0) |
| 392 | return (1); |
| 393 | switch (rw) { |
| 394 | |
| 395 | case FREAD: |
| 396 | /* |
| 397 | * Need to block timeouts (ttrstart). |
| 398 | */ |
| 399 | s = spltty(); |
| 400 | if ((tp->t_state&TS_ISOPEN) && |
| 401 | RB_LEN(&tp->t_out) && (tp->t_state&TS_TTSTOP) == 0) { |
| 402 | splx(s); |
| 403 | return (1); |
| 404 | } |
| 405 | splx(s); |
| 406 | /* FALLTHROUGH */ |
| 407 | |
| 408 | case 0: /* exceptional */ |
| 409 | if ((tp->t_state&TS_ISOPEN) && |
| 410 | (pti->pt_flags&PF_PKT && pti->pt_send || |
| 411 | pti->pt_flags&PF_UCNTL && pti->pt_ucntl)) |
| 412 | return (1); |
| 413 | if ((prev = pti->pt_selr) && prev->p_wchan == (caddr_t)&selwait) |
| 414 | pti->pt_flags |= PF_RCOLL; |
| 415 | else |
| 416 | pti->pt_selr = p; |
| 417 | break; |
| 418 | |
| 419 | |
| 420 | case FWRITE: |
| 421 | if (tp->t_state&TS_ISOPEN) { |
| 422 | if (pti->pt_flags & PF_REMOTE) { |
| 423 | if (RB_LEN(&tp->t_can) == 0) |
| 424 | return (1); |
| 425 | } else { |
| 426 | if (RB_LEN(&tp->t_raw) + RB_LEN(&tp->t_can) < TTYHOG-2) |
| 427 | return (1); |
| 428 | if (RB_LEN(&tp->t_can) == 0 && (tp->t_iflag&ICANON)) |
| 429 | return (1); |
| 430 | } |
| 431 | } |
| 432 | if ((prev = pti->pt_selw) && prev->p_wchan == (caddr_t)&selwait) |
| 433 | pti->pt_flags |= PF_WCOLL; |
| 434 | else |
| 435 | pti->pt_selw = p; |
| 436 | break; |
| 437 | |
| 438 | } |
| 439 | return (0); |
| 440 | } |
| 441 | |
| 442 | ptcwrite(dev, uio, flag) |
| 443 | dev_t dev; |
| 444 | register struct uio *uio; |
| 445 | { |
| 446 | register struct tty *tp = &pt_tty[minor(dev)]; |
| 447 | register u_char *cp; |
| 448 | register int cc = 0; |
| 449 | u_char locbuf[BUFSIZ]; |
| 450 | int cnt = 0; |
| 451 | struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; |
| 452 | int error = 0; |
| 453 | |
| 454 | again: |
| 455 | if ((tp->t_state&TS_ISOPEN) == 0) |
| 456 | goto block; |
| 457 | if (pti->pt_flags & PF_REMOTE) { |
| 458 | if (RB_LEN(&tp->t_can)) |
| 459 | goto block; |
| 460 | while (uio->uio_resid > 0 && RB_LEN(&tp->t_can) < TTYHOG - 1) { |
| 461 | if (cc == 0) { |
| 462 | cc = min(uio->uio_resid, BUFSIZ); |
| 463 | cc = min(cc, TTYHOG - 1 - RB_CONTIGPUT(&tp->t_can)); |
| 464 | cp = locbuf; |
| 465 | error = uiomove((caddr_t)cp, cc, uio); |
| 466 | if (error) |
| 467 | return (error); |
| 468 | /* check again for safety */ |
| 469 | if ((tp->t_state&TS_ISOPEN) == 0) |
| 470 | return (EIO); |
| 471 | } |
| 472 | #ifdef was |
| 473 | if (cc) |
| 474 | (void) b_to_q((char *)cp, cc, &tp->t_canq); |
| 475 | #else |
| 476 | if (cc) { |
| 477 | bcopy(cp, tp->t_can.rb_tl, cc); |
| 478 | tp->t_can.rb_tl = |
| 479 | RB_ROLLOVER(&tp->t_can, tp->t_can.rb_tl+cc); |
| 480 | } |
| 481 | #endif |
| 482 | cc = 0; |
| 483 | } |
| 484 | (void) putc(0, &tp->t_can); |
| 485 | ttwakeup(tp); |
| 486 | wakeup((caddr_t)&tp->t_can); |
| 487 | return (0); |
| 488 | } |
| 489 | while (uio->uio_resid > 0) { |
| 490 | if (cc == 0) { |
| 491 | cc = min(uio->uio_resid, BUFSIZ); |
| 492 | cp = locbuf; |
| 493 | error = uiomove((caddr_t)cp, cc, uio); |
| 494 | if (error) |
| 495 | return (error); |
| 496 | /* check again for safety */ |
| 497 | if ((tp->t_state&TS_ISOPEN) == 0) |
| 498 | return (EIO); |
| 499 | } |
| 500 | while (cc > 0) { |
| 501 | if ((RB_LEN(&tp->t_raw) + RB_LEN(&tp->t_can)) >= TTYHOG - 2 && |
| 502 | (RB_LEN(&tp->t_can) > 0 || !(tp->t_iflag&ICANON))) { |
| 503 | wakeup((caddr_t)&tp->t_raw); |
| 504 | goto block; |
| 505 | } |
| 506 | (*linesw[tp->t_line].l_rint)(*cp++, tp); |
| 507 | cnt++; |
| 508 | cc--; |
| 509 | } |
| 510 | cc = 0; |
| 511 | } |
| 512 | return (0); |
| 513 | block: |
| 514 | /* |
| 515 | * Come here to wait for slave to open, for space |
| 516 | * in outq, or space in rawq. |
| 517 | */ |
| 518 | if ((tp->t_state&TS_CARR_ON) == 0) |
| 519 | return (EIO); |
| 520 | if (flag & IO_NDELAY) { |
| 521 | /* adjust for data copied in but not written */ |
| 522 | uio->uio_resid += cc; |
| 523 | if (cnt == 0) |
| 524 | return (EWOULDBLOCK); |
| 525 | return (0); |
| 526 | } |
| 527 | if (error = tsleep((caddr_t)&tp->t_raw.rb_hd, TTOPRI | PCATCH, |
| 528 | ttyout, 0)) { |
| 529 | /* adjust for data copied in but not written */ |
| 530 | uio->uio_resid += cc; |
| 531 | return (error); |
| 532 | } |
| 533 | goto again; |
| 534 | } |
| 535 | |
| 536 | /*ARGSUSED*/ |
| 537 | ptyioctl(dev, cmd, data, flag) |
| 538 | caddr_t data; |
| 539 | dev_t dev; |
| 540 | { |
| 541 | register struct tty *tp = &pt_tty[minor(dev)]; |
| 542 | register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; |
| 543 | register u_char *cc = tp->t_cc; |
| 544 | int stop, error; |
| 545 | extern ttyinput(); |
| 546 | |
| 547 | /* |
| 548 | * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. |
| 549 | * ttywflush(tp) will hang if there are characters in the outq. |
| 550 | */ |
| 551 | if (cmd == TIOCEXT) { |
| 552 | /* |
| 553 | * When the EXTPROC bit is being toggled, we need |
| 554 | * to send an TIOCPKT_IOCTL if the packet driver |
| 555 | * is turned on. |
| 556 | */ |
| 557 | if (*(int *)data) { |
| 558 | if (pti->pt_flags & PF_PKT) { |
| 559 | pti->pt_send |= TIOCPKT_IOCTL; |
| 560 | ptcwakeup(tp, FREAD); |
| 561 | } |
| 562 | tp->t_lflag |= EXTPROC; |
| 563 | } else { |
| 564 | if ((tp->t_state & EXTPROC) && |
| 565 | (pti->pt_flags & PF_PKT)) { |
| 566 | pti->pt_send |= TIOCPKT_IOCTL; |
| 567 | ptcwakeup(tp, FREAD); |
| 568 | } |
| 569 | tp->t_lflag &= ~EXTPROC; |
| 570 | } |
| 571 | return(0); |
| 572 | } else |
| 573 | if (cdevsw[major(dev)].d_open == ptcopen) |
| 574 | switch (cmd) { |
| 575 | |
| 576 | case TIOCGPGRP: |
| 577 | /* |
| 578 | * We aviod calling ttioctl on the controller since, |
| 579 | * in that case, tp must be the controlling terminal. |
| 580 | */ |
| 581 | *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; |
| 582 | return (0); |
| 583 | |
| 584 | case TIOCPKT: |
| 585 | if (*(int *)data) { |
| 586 | if (pti->pt_flags & PF_UCNTL) |
| 587 | return (EINVAL); |
| 588 | pti->pt_flags |= PF_PKT; |
| 589 | } else |
| 590 | pti->pt_flags &= ~PF_PKT; |
| 591 | return (0); |
| 592 | |
| 593 | case TIOCUCNTL: |
| 594 | if (*(int *)data) { |
| 595 | if (pti->pt_flags & PF_PKT) |
| 596 | return (EINVAL); |
| 597 | pti->pt_flags |= PF_UCNTL; |
| 598 | } else |
| 599 | pti->pt_flags &= ~PF_UCNTL; |
| 600 | return (0); |
| 601 | |
| 602 | case TIOCREMOTE: |
| 603 | if (*(int *)data) |
| 604 | pti->pt_flags |= PF_REMOTE; |
| 605 | else |
| 606 | pti->pt_flags &= ~PF_REMOTE; |
| 607 | ttyflush(tp, FREAD|FWRITE); |
| 608 | return (0); |
| 609 | |
| 610 | case TIOCSETP: |
| 611 | case TIOCSETN: |
| 612 | case TIOCSETD: |
| 613 | case TIOCSETA: |
| 614 | case TIOCSETAW: |
| 615 | case TIOCSETAF: |
| 616 | while (getc(&tp->t_out) >= 0) |
| 617 | ; |
| 618 | break; |
| 619 | |
| 620 | case TIOCSIG: |
| 621 | if (*(unsigned int *)data >= NSIG) |
| 622 | return(EINVAL); |
| 623 | if ((tp->t_lflag&NOFLSH) == 0) |
| 624 | ttyflush(tp, FREAD|FWRITE); |
| 625 | pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); |
| 626 | if ((*(unsigned int *)data == SIGINFO) && |
| 627 | ((tp->t_lflag&NOKERNINFO) == 0)) |
| 628 | ttyinfo(tp); |
| 629 | return(0); |
| 630 | } |
| 631 | error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag); |
| 632 | if (error < 0) |
| 633 | error = ttioctl(tp, cmd, data, flag); |
| 634 | /* |
| 635 | * Since we use the tty queues internally, |
| 636 | * pty's can't be switched to disciplines which overwrite |
| 637 | * the queues. We can't tell anything about the discipline |
| 638 | * from here... |
| 639 | */ |
| 640 | if (linesw[tp->t_line].l_rint != ttyinput) { |
| 641 | (*linesw[tp->t_line].l_close)(tp, flag); |
| 642 | tp->t_line = TTYDISC; |
| 643 | (void)(*linesw[tp->t_line].l_open)(dev, tp, flag); |
| 644 | error = ENOTTY; |
| 645 | } |
| 646 | if (error < 0) { |
| 647 | if (pti->pt_flags & PF_UCNTL && |
| 648 | (cmd & ~0xff) == UIOCCMD(0)) { |
| 649 | if (cmd & 0xff) { |
| 650 | pti->pt_ucntl = (u_char)cmd; |
| 651 | ptcwakeup(tp, FREAD); |
| 652 | } |
| 653 | return (0); |
| 654 | } |
| 655 | error = ENOTTY; |
| 656 | } |
| 657 | /* |
| 658 | * If external processing and packet mode send ioctl packet. |
| 659 | */ |
| 660 | if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { |
| 661 | switch(cmd) { |
| 662 | case TIOCSETA: |
| 663 | case TIOCSETAW: |
| 664 | case TIOCSETAF: |
| 665 | case TIOCSETP: |
| 666 | case TIOCSETN: |
| 667 | #ifdef COMPAT_43 |
| 668 | case TIOCSETC: |
| 669 | case TIOCSLTC: |
| 670 | case TIOCLBIS: |
| 671 | case TIOCLBIC: |
| 672 | case TIOCLSET: |
| 673 | #endif |
| 674 | pti->pt_send |= TIOCPKT_IOCTL; |
| 675 | default: |
| 676 | break; |
| 677 | } |
| 678 | } |
| 679 | stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) |
| 680 | && CCEQ(cc[VSTART], CTRL('q')); |
| 681 | if (pti->pt_flags & PF_NOSTOP) { |
| 682 | if (stop) { |
| 683 | pti->pt_send &= ~TIOCPKT_NOSTOP; |
| 684 | pti->pt_send |= TIOCPKT_DOSTOP; |
| 685 | pti->pt_flags &= ~PF_NOSTOP; |
| 686 | ptcwakeup(tp, FREAD); |
| 687 | } |
| 688 | } else { |
| 689 | if (!stop) { |
| 690 | pti->pt_send &= ~TIOCPKT_DOSTOP; |
| 691 | pti->pt_send |= TIOCPKT_NOSTOP; |
| 692 | pti->pt_flags |= PF_NOSTOP; |
| 693 | ptcwakeup(tp, FREAD); |
| 694 | } |
| 695 | } |
| 696 | return (error); |
| 697 | } |
| 698 | #endif |