| 1 | /*- |
| 2 | * Copyright (c) 1982, 1986, 1990, 1991, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * (c) UNIX System Laboratories, Inc. |
| 5 | * All or some portions of this file are derived from material licensed |
| 6 | * to the University of California by American Telephone and Telegraph |
| 7 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 8 | * the permission of UNIX System Laboratories, Inc. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. All advertising materials mentioning features or use of this software |
| 19 | * must display the following acknowledgement: |
| 20 | * This product includes software developed by the University of |
| 21 | * California, Berkeley and its contributors. |
| 22 | * 4. Neither the name of the University nor the names of its contributors |
| 23 | * may be used to endorse or promote products derived from this software |
| 24 | * without specific prior written permission. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 36 | * SUCH DAMAGE. |
| 37 | * |
| 38 | * @(#)tty.c 8.8 (Berkeley) 1/21/94 |
| 39 | * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $ |
| 40 | * $DragonFly: src/sys/kern/tty.c,v 1.46 2008/09/10 09:50:09 y0netan1 Exp $ |
| 41 | */ |
| 42 | |
| 43 | /*- |
| 44 | * TODO: |
| 45 | * o Fix races for sending the start char in ttyflush(). |
| 46 | * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect(). |
| 47 | * With luck, there will be MIN chars before select() returns(). |
| 48 | * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it. |
| 49 | * o Don't allow input in TS_ZOMBIE case. It would be visible through |
| 50 | * FIONREAD. |
| 51 | * o Do the new sio locking stuff here and use it to avoid special |
| 52 | * case for EXTPROC? |
| 53 | * o Lock PENDIN too? |
| 54 | * o Move EXTPROC and/or PENDIN to t_state? |
| 55 | * o Wrap most of ttioctl in spltty/splx. |
| 56 | * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>. |
| 57 | * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set. |
| 58 | * o Don't allow certain termios flags to affect disciplines other |
| 59 | * than TTYDISC. Cancel their effects before switch disciplines |
| 60 | * and ignore them if they are set while we are in another |
| 61 | * discipline. |
| 62 | * o Now that historical speed conversions are handled here, don't |
| 63 | * do them in drivers. |
| 64 | * o Check for TS_CARR_ON being set while everything is closed and not |
| 65 | * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open, |
| 66 | * so it would live until the next open even if carrier drops. |
| 67 | * o Restore TS_WOPEN since it is useful in pstat. It must be cleared |
| 68 | * only when _all_ openers leave open(). |
| 69 | */ |
| 70 | |
| 71 | #include "opt_compat.h" |
| 72 | #include "opt_uconsole.h" |
| 73 | |
| 74 | #include <sys/param.h> |
| 75 | #include <sys/systm.h> |
| 76 | #include <sys/filio.h> |
| 77 | #if defined(COMPAT_43) || defined(COMPAT_SUNOS) |
| 78 | #include <sys/ioctl_compat.h> |
| 79 | #endif |
| 80 | #include <sys/proc.h> |
| 81 | #include <sys/priv.h> |
| 82 | #define TTYDEFCHARS |
| 83 | #include <sys/tty.h> |
| 84 | #include <sys/clist.h> |
| 85 | #undef TTYDEFCHARS |
| 86 | #include <sys/fcntl.h> |
| 87 | #include <sys/conf.h> |
| 88 | #include <sys/dkstat.h> |
| 89 | #include <sys/kernel.h> |
| 90 | #include <sys/vnode.h> |
| 91 | #include <sys/signalvar.h> |
| 92 | #include <sys/signal2.h> |
| 93 | #include <sys/resourcevar.h> |
| 94 | #include <sys/malloc.h> |
| 95 | #include <sys/filedesc.h> |
| 96 | #include <sys/sysctl.h> |
| 97 | #include <sys/thread2.h> |
| 98 | |
| 99 | #include <vm/vm.h> |
| 100 | #include <sys/lock.h> |
| 101 | #include <vm/pmap.h> |
| 102 | #include <vm/vm_map.h> |
| 103 | |
| 104 | MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures"); |
| 105 | |
| 106 | static int proc_compare (struct proc *p1, struct proc *p2); |
| 107 | static int ttnread (struct tty *tp); |
| 108 | static void ttyecho (int c, struct tty *tp); |
| 109 | static int ttyoutput (int c, struct tty *tp); |
| 110 | static void ttypend (struct tty *tp); |
| 111 | static void ttyretype (struct tty *tp); |
| 112 | static void ttyrub (int c, struct tty *tp); |
| 113 | static void ttyrubo (struct tty *tp, int cnt); |
| 114 | static void ttyunblock (struct tty *tp); |
| 115 | static int ttywflush (struct tty *tp); |
| 116 | static int filt_ttyread (struct knote *kn, long hint); |
| 117 | static void filt_ttyrdetach (struct knote *kn); |
| 118 | static int filt_ttywrite (struct knote *kn, long hint); |
| 119 | static void filt_ttywdetach (struct knote *kn); |
| 120 | |
| 121 | /* |
| 122 | * Table with character classes and parity. The 8th bit indicates parity, |
| 123 | * the 7th bit indicates the character is an alphameric or underscore (for |
| 124 | * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits |
| 125 | * are 0 then the character needs no special processing on output; classes |
| 126 | * other than 0 might be translated or (not currently) require delays. |
| 127 | */ |
| 128 | #define E 0x00 /* Even parity. */ |
| 129 | #define O 0x80 /* Odd parity. */ |
| 130 | #define PARITY(c) (char_type[c] & O) |
| 131 | |
| 132 | #define ALPHA 0x40 /* Alpha or underscore. */ |
| 133 | #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) |
| 134 | |
| 135 | #define CCLASSMASK 0x3f |
| 136 | #define CCLASS(c) (char_type[c] & CCLASSMASK) |
| 137 | |
| 138 | #define BS BACKSPACE |
| 139 | #define CC CONTROL |
| 140 | #define CR RETURN |
| 141 | #define NA ORDINARY | ALPHA |
| 142 | #define NL NEWLINE |
| 143 | #define NO ORDINARY |
| 144 | #define TB TAB |
| 145 | #define VT VTAB |
| 146 | |
| 147 | static u_char const char_type[] = { |
| 148 | E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ |
| 149 | O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ |
| 150 | O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ |
| 151 | E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ |
| 152 | O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ |
| 153 | E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ |
| 154 | E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ |
| 155 | O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ |
| 156 | O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ |
| 157 | E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ |
| 158 | E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ |
| 159 | O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ |
| 160 | E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ |
| 161 | O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ |
| 162 | O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ |
| 163 | E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ |
| 164 | /* |
| 165 | * Meta chars; should be settable per character set; |
| 166 | * for now, treat them all as normal characters. |
| 167 | */ |
| 168 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 169 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 170 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 171 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 172 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 173 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 174 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 175 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 176 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 177 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 178 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 179 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 180 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 181 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 182 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 183 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 184 | }; |
| 185 | #undef BS |
| 186 | #undef CC |
| 187 | #undef CR |
| 188 | #undef NA |
| 189 | #undef NL |
| 190 | #undef NO |
| 191 | #undef TB |
| 192 | #undef VT |
| 193 | |
| 194 | /* Macros to clear/set/test flags. */ |
| 195 | #define SET(t, f) (t) |= (f) |
| 196 | #define CLR(t, f) (t) &= ~(f) |
| 197 | #define ISSET(t, f) ((t) & (f)) |
| 198 | |
| 199 | #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */ |
| 200 | #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */ |
| 201 | |
| 202 | uint64_t tk_nin; |
| 203 | SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin), |
| 204 | "LU", "TTY input statistic"); |
| 205 | uint64_t tk_nout; |
| 206 | SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout), |
| 207 | "LU", "TTY output statistic"); |
| 208 | uint64_t tk_rawcc; |
| 209 | |
| 210 | /* |
| 211 | * list of struct tty where pstat(8) can pick it up with sysctl |
| 212 | */ |
| 213 | static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); |
| 214 | |
| 215 | /* |
| 216 | * Initial open of tty, or (re)entry to standard tty line discipline. |
| 217 | */ |
| 218 | int |
| 219 | ttyopen(cdev_t device, struct tty *tp) |
| 220 | { |
| 221 | crit_enter(); |
| 222 | tp->t_dev = device; |
| 223 | if (!ISSET(tp->t_state, TS_ISOPEN)) { |
| 224 | SET(tp->t_state, TS_ISOPEN); |
| 225 | if (ISSET(tp->t_cflag, CLOCAL)) { |
| 226 | SET(tp->t_state, TS_CONNECTED); |
| 227 | } |
| 228 | bzero(&tp->t_winsize, sizeof(tp->t_winsize)); |
| 229 | } |
| 230 | ttsetwater(tp); |
| 231 | crit_exit(); |
| 232 | return (0); |
| 233 | } |
| 234 | |
| 235 | /* |
| 236 | * Handle close() on a tty line: flush and set to initial state, |
| 237 | * bumping generation number so that pending read/write calls |
| 238 | * can detect recycling of the tty. |
| 239 | * |
| 240 | * XXX our caller should have done `spltty(); l_close(); ttyclose();' |
| 241 | * and l_close() should have flushed, but we repeat the spltty() and |
| 242 | * the flush in case there are buggy callers. |
| 243 | */ |
| 244 | int |
| 245 | ttyclose(struct tty *tp) |
| 246 | { |
| 247 | funsetown(tp->t_sigio); |
| 248 | crit_enter(); |
| 249 | if (constty == tp) |
| 250 | constty = NULL; |
| 251 | |
| 252 | ttyflush(tp, FREAD | FWRITE); |
| 253 | clist_free_cblocks(&tp->t_canq); |
| 254 | clist_free_cblocks(&tp->t_outq); |
| 255 | clist_free_cblocks(&tp->t_rawq); |
| 256 | |
| 257 | tp->t_gen++; |
| 258 | tp->t_line = TTYDISC; |
| 259 | ttyclearsession(tp); |
| 260 | tp->t_state &= TS_REGISTERED; /* clear all bits except */ |
| 261 | crit_exit(); |
| 262 | return (0); |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * Disassociate the tty from its session. Traditionally this has only been |
| 267 | * a half-close, meaning that the session was still allowed to point at the |
| 268 | * tty (resulting in the tty in the ps command showing something like 'p0-'), |
| 269 | * even though the tty is no longer pointing at the session. |
| 270 | * |
| 271 | * The half close seems to be useful only for 'ps' output but there is as |
| 272 | * yet no reason to remove the feature. The full-close code is currently |
| 273 | * #if 0'd out. See also sess_rele() in kern/kern_proc.c. |
| 274 | */ |
| 275 | void |
| 276 | ttyclearsession(struct tty *tp) |
| 277 | { |
| 278 | struct session *sp; |
| 279 | |
| 280 | tp->t_pgrp = NULL; |
| 281 | if ((sp = tp->t_session) != NULL) { |
| 282 | tp->t_session = NULL; |
| 283 | #ifdef TTY_DO_FULL_CLOSE |
| 284 | /* FULL CLOSE (not yet) */ |
| 285 | if (sp->s_ttyp == tp) { |
| 286 | sp->s_ttyp = NULL; |
| 287 | } else { |
| 288 | kprintf("ttyclearsession: warning: sp->s_ttyp != tp " |
| 289 | "%p/%p\n", sp->s_ttyp, tp); |
| 290 | } |
| 291 | #endif |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | /* |
| 296 | * Release the tty vnode association for a session. This is the |
| 297 | * 'other half' of the close. Because multiple opens of /dev/tty |
| 298 | * only generate a single open to the actual tty, the file modes |
| 299 | * are locked to FREAD|FWRITE. |
| 300 | * |
| 301 | * If dorevoke is non-zero, the session is also revoked. We have to |
| 302 | * close the vnode if VCTTYISOPEN is set. |
| 303 | */ |
| 304 | void |
| 305 | ttyclosesession(struct session *sp, int dorevoke) |
| 306 | { |
| 307 | struct vnode *vp; |
| 308 | |
| 309 | retry: |
| 310 | /* |
| 311 | * There may not be a controlling terminal or it may have been closed |
| 312 | * out from under us. |
| 313 | */ |
| 314 | if ((vp = sp->s_ttyvp) == NULL) |
| 315 | return; |
| 316 | |
| 317 | /* |
| 318 | * We need a lock if we have to close or revoke. |
| 319 | */ |
| 320 | if ((vp->v_flag & VCTTYISOPEN) || dorevoke) { |
| 321 | vhold(vp); |
| 322 | if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY)) { |
| 323 | vdrop(vp); |
| 324 | goto retry; |
| 325 | } |
| 326 | |
| 327 | /* |
| 328 | * Retry if the vnode was ripped out from under us |
| 329 | */ |
| 330 | if (vp != sp->s_ttyvp) { |
| 331 | vn_unlock(vp); |
| 332 | vdrop(vp); |
| 333 | goto retry; |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * Close and revoke as needed |
| 338 | */ |
| 339 | sp->s_ttyvp = NULL; |
| 340 | if (vp->v_flag & VCTTYISOPEN) { |
| 341 | vclrflags(vp, VCTTYISOPEN); |
| 342 | VOP_CLOSE(vp, FREAD|FWRITE); |
| 343 | } |
| 344 | vn_unlock(vp); |
| 345 | if (dorevoke) |
| 346 | vrevoke(vp, proc0.p_ucred); |
| 347 | vdrop(vp); |
| 348 | } else { |
| 349 | sp->s_ttyvp = NULL; |
| 350 | } |
| 351 | vrele(vp); |
| 352 | } |
| 353 | |
| 354 | #define FLUSHQ(q) { \ |
| 355 | if ((q)->c_cc) \ |
| 356 | ndflush(q, (q)->c_cc); \ |
| 357 | } |
| 358 | |
| 359 | /* Is 'c' a line delimiter ("break" character)? */ |
| 360 | #define TTBREAKC(c, lflag) \ |
| 361 | ((c) == '\n' || (((c) == cc[VEOF] || \ |
| 362 | (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ |
| 363 | (c) != _POSIX_VDISABLE)) |
| 364 | |
| 365 | /* |
| 366 | * Process input of a single character received on a tty. |
| 367 | */ |
| 368 | int |
| 369 | ttyinput(int c, struct tty *tp) |
| 370 | { |
| 371 | tcflag_t iflag, lflag; |
| 372 | cc_t *cc; |
| 373 | int i, err; |
| 374 | |
| 375 | /* |
| 376 | * If input is pending take it first. |
| 377 | */ |
| 378 | lflag = tp->t_lflag; |
| 379 | if (ISSET(lflag, PENDIN)) |
| 380 | ttypend(tp); |
| 381 | /* |
| 382 | * Gather stats. |
| 383 | */ |
| 384 | if (ISSET(lflag, ICANON)) |
| 385 | ++tp->t_cancc; |
| 386 | else |
| 387 | ++tp->t_rawcc; |
| 388 | ++tk_nin; |
| 389 | |
| 390 | /* |
| 391 | * Block further input iff: |
| 392 | * current input > threshold AND input is available to user program |
| 393 | * AND input flow control is enabled and not yet invoked. |
| 394 | * The 3 is slop for PARMRK. |
| 395 | */ |
| 396 | iflag = tp->t_iflag; |
| 397 | if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 && |
| 398 | (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && |
| 399 | (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && |
| 400 | !ISSET(tp->t_state, TS_TBLOCK)) |
| 401 | ttyblock(tp); |
| 402 | |
| 403 | /* Handle exceptional conditions (break, parity, framing). */ |
| 404 | cc = tp->t_cc; |
| 405 | err = (ISSET(c, TTY_ERRORMASK)); |
| 406 | if (err) { |
| 407 | CLR(c, TTY_ERRORMASK); |
| 408 | if (ISSET(err, TTY_BI)) { |
| 409 | if (ISSET(iflag, IGNBRK)) |
| 410 | return (0); |
| 411 | if (ISSET(iflag, BRKINT)) { |
| 412 | ttyflush(tp, FREAD | FWRITE); |
| 413 | pgsignal(tp->t_pgrp, SIGINT, 1); |
| 414 | goto endcase; |
| 415 | } |
| 416 | if (ISSET(iflag, PARMRK)) |
| 417 | goto parmrk; |
| 418 | } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) |
| 419 | || ISSET(err, TTY_FE)) { |
| 420 | if (ISSET(iflag, IGNPAR)) |
| 421 | return (0); |
| 422 | else if (ISSET(iflag, PARMRK)) { |
| 423 | parmrk: |
| 424 | if (tp->t_rawq.c_cc + tp->t_canq.c_cc > |
| 425 | MAX_INPUT - 3) |
| 426 | goto input_overflow; |
| 427 | clist_putc(0377 | TTY_QUOTE, &tp->t_rawq); |
| 428 | clist_putc(0 | TTY_QUOTE, &tp->t_rawq); |
| 429 | clist_putc(c | TTY_QUOTE, &tp->t_rawq); |
| 430 | goto endcase; |
| 431 | } else |
| 432 | c = 0; |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) |
| 437 | CLR(c, 0x80); |
| 438 | if (!ISSET(lflag, EXTPROC)) { |
| 439 | /* |
| 440 | * Check for literal nexting very first |
| 441 | */ |
| 442 | if (ISSET(tp->t_state, TS_LNCH)) { |
| 443 | SET(c, TTY_QUOTE); |
| 444 | CLR(tp->t_state, TS_LNCH); |
| 445 | } |
| 446 | /* |
| 447 | * Scan for special characters. This code |
| 448 | * is really just a big case statement with |
| 449 | * non-constant cases. The bottom of the |
| 450 | * case statement is labeled ``endcase'', so goto |
| 451 | * it after a case match, or similar. |
| 452 | */ |
| 453 | |
| 454 | /* |
| 455 | * Control chars which aren't controlled |
| 456 | * by ICANON, ISIG, or IXON. |
| 457 | */ |
| 458 | if (ISSET(lflag, IEXTEN)) { |
| 459 | if (CCEQ(cc[VLNEXT], c)) { |
| 460 | if (ISSET(lflag, ECHO)) { |
| 461 | if (ISSET(lflag, ECHOE)) { |
| 462 | (void)ttyoutput('^', tp); |
| 463 | (void)ttyoutput('\b', tp); |
| 464 | } else |
| 465 | ttyecho(c, tp); |
| 466 | } |
| 467 | SET(tp->t_state, TS_LNCH); |
| 468 | goto endcase; |
| 469 | } |
| 470 | if (CCEQ(cc[VDISCARD], c)) { |
| 471 | if (ISSET(lflag, FLUSHO)) |
| 472 | CLR(tp->t_lflag, FLUSHO); |
| 473 | else { |
| 474 | ttyflush(tp, FWRITE); |
| 475 | ttyecho(c, tp); |
| 476 | if (tp->t_rawq.c_cc + tp->t_canq.c_cc) |
| 477 | ttyretype(tp); |
| 478 | SET(tp->t_lflag, FLUSHO); |
| 479 | } |
| 480 | goto startoutput; |
| 481 | } |
| 482 | } |
| 483 | /* |
| 484 | * Signals. |
| 485 | */ |
| 486 | if (ISSET(lflag, ISIG)) { |
| 487 | if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { |
| 488 | if (!ISSET(lflag, NOFLSH)) |
| 489 | ttyflush(tp, FREAD | FWRITE); |
| 490 | ttyecho(c, tp); |
| 491 | pgsignal(tp->t_pgrp, |
| 492 | CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); |
| 493 | goto endcase; |
| 494 | } |
| 495 | if (CCEQ(cc[VSUSP], c)) { |
| 496 | if (!ISSET(lflag, NOFLSH)) |
| 497 | ttyflush(tp, FREAD); |
| 498 | ttyecho(c, tp); |
| 499 | pgsignal(tp->t_pgrp, SIGTSTP, 1); |
| 500 | goto endcase; |
| 501 | } |
| 502 | } |
| 503 | /* |
| 504 | * Handle start/stop characters. |
| 505 | */ |
| 506 | if (ISSET(iflag, IXON)) { |
| 507 | if (CCEQ(cc[VSTOP], c)) { |
| 508 | if (!ISSET(tp->t_state, TS_TTSTOP)) { |
| 509 | SET(tp->t_state, TS_TTSTOP); |
| 510 | (*tp->t_stop)(tp, 0); |
| 511 | return (0); |
| 512 | } |
| 513 | if (!CCEQ(cc[VSTART], c)) |
| 514 | return (0); |
| 515 | /* |
| 516 | * if VSTART == VSTOP then toggle |
| 517 | */ |
| 518 | goto endcase; |
| 519 | } |
| 520 | if (CCEQ(cc[VSTART], c)) |
| 521 | goto restartoutput; |
| 522 | } |
| 523 | /* |
| 524 | * IGNCR, ICRNL, & INLCR |
| 525 | */ |
| 526 | if (c == '\r') { |
| 527 | if (ISSET(iflag, IGNCR)) |
| 528 | return (0); |
| 529 | else if (ISSET(iflag, ICRNL)) |
| 530 | c = '\n'; |
| 531 | } else if (c == '\n' && ISSET(iflag, INLCR)) |
| 532 | c = '\r'; |
| 533 | } |
| 534 | if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { |
| 535 | /* |
| 536 | * From here on down canonical mode character |
| 537 | * processing takes place. |
| 538 | */ |
| 539 | /* |
| 540 | * erase or erase2 (^H / ^?) |
| 541 | */ |
| 542 | if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) { |
| 543 | if (tp->t_rawq.c_cc) |
| 544 | ttyrub(clist_unputc(&tp->t_rawq), tp); |
| 545 | goto endcase; |
| 546 | } |
| 547 | /* |
| 548 | * kill (^U) |
| 549 | */ |
| 550 | if (CCEQ(cc[VKILL], c)) { |
| 551 | if (ISSET(lflag, ECHOKE) && |
| 552 | tp->t_rawq.c_cc == tp->t_rocount && |
| 553 | !ISSET(lflag, ECHOPRT)) |
| 554 | while (tp->t_rawq.c_cc) |
| 555 | ttyrub(clist_unputc(&tp->t_rawq), tp); |
| 556 | else { |
| 557 | ttyecho(c, tp); |
| 558 | if (ISSET(lflag, ECHOK) || |
| 559 | ISSET(lflag, ECHOKE)) |
| 560 | ttyecho('\n', tp); |
| 561 | FLUSHQ(&tp->t_rawq); |
| 562 | tp->t_rocount = 0; |
| 563 | } |
| 564 | CLR(tp->t_state, TS_LOCAL); |
| 565 | goto endcase; |
| 566 | } |
| 567 | /* |
| 568 | * word erase (^W) |
| 569 | */ |
| 570 | if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { |
| 571 | int ctype; |
| 572 | |
| 573 | /* |
| 574 | * erase whitespace |
| 575 | */ |
| 576 | while ((c = clist_unputc(&tp->t_rawq)) == ' ' || c == '\t') |
| 577 | ttyrub(c, tp); |
| 578 | if (c == -1) |
| 579 | goto endcase; |
| 580 | /* |
| 581 | * erase last char of word and remember the |
| 582 | * next chars type (for ALTWERASE) |
| 583 | */ |
| 584 | ttyrub(c, tp); |
| 585 | c = clist_unputc(&tp->t_rawq); |
| 586 | if (c == -1) |
| 587 | goto endcase; |
| 588 | if (c == ' ' || c == '\t') { |
| 589 | clist_putc(c, &tp->t_rawq); |
| 590 | goto endcase; |
| 591 | } |
| 592 | ctype = ISALPHA(c); |
| 593 | /* |
| 594 | * erase rest of word |
| 595 | */ |
| 596 | do { |
| 597 | ttyrub(c, tp); |
| 598 | c = clist_unputc(&tp->t_rawq); |
| 599 | if (c == -1) |
| 600 | goto endcase; |
| 601 | } while (c != ' ' && c != '\t' && |
| 602 | (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); |
| 603 | clist_putc(c, &tp->t_rawq); |
| 604 | goto endcase; |
| 605 | } |
| 606 | /* |
| 607 | * reprint line (^R) |
| 608 | */ |
| 609 | if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { |
| 610 | ttyretype(tp); |
| 611 | goto endcase; |
| 612 | } |
| 613 | /* |
| 614 | * ^T - kernel info and generate SIGINFO |
| 615 | */ |
| 616 | if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { |
| 617 | if (ISSET(lflag, ISIG)) |
| 618 | pgsignal(tp->t_pgrp, SIGINFO, 1); |
| 619 | if (!ISSET(lflag, NOKERNINFO)) |
| 620 | ttyinfo(tp); |
| 621 | goto endcase; |
| 622 | } |
| 623 | if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) { |
| 624 | if (ISSET(lflag, ISIG)) |
| 625 | pgsignal(tp->t_pgrp, SIGCKPT, 1); |
| 626 | goto endcase; |
| 627 | } |
| 628 | } |
| 629 | /* |
| 630 | * Check for input buffer overflow |
| 631 | */ |
| 632 | if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { |
| 633 | input_overflow: |
| 634 | if (ISSET(iflag, IMAXBEL)) { |
| 635 | if (tp->t_outq.c_cc < tp->t_ohiwat) |
| 636 | (void)ttyoutput(CTRL('g'), tp); |
| 637 | } |
| 638 | goto endcase; |
| 639 | } |
| 640 | |
| 641 | if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) |
| 642 | && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) |
| 643 | clist_putc(0377 | TTY_QUOTE, &tp->t_rawq); |
| 644 | |
| 645 | /* |
| 646 | * Put data char in q for user and |
| 647 | * wakeup on seeing a line delimiter. |
| 648 | */ |
| 649 | if (clist_putc(c, &tp->t_rawq) >= 0) { |
| 650 | if (!ISSET(lflag, ICANON)) { |
| 651 | ttwakeup(tp); |
| 652 | ttyecho(c, tp); |
| 653 | goto endcase; |
| 654 | } |
| 655 | if (TTBREAKC(c, lflag)) { |
| 656 | tp->t_rocount = 0; |
| 657 | catq(&tp->t_rawq, &tp->t_canq); |
| 658 | ttwakeup(tp); |
| 659 | } else if (tp->t_rocount++ == 0) |
| 660 | tp->t_rocol = tp->t_column; |
| 661 | if (ISSET(tp->t_state, TS_ERASE)) { |
| 662 | /* |
| 663 | * end of prterase \.../ |
| 664 | */ |
| 665 | CLR(tp->t_state, TS_ERASE); |
| 666 | (void)ttyoutput('/', tp); |
| 667 | } |
| 668 | i = tp->t_column; |
| 669 | ttyecho(c, tp); |
| 670 | if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { |
| 671 | /* |
| 672 | * Place the cursor over the '^' of the ^D. |
| 673 | */ |
| 674 | i = imin(2, tp->t_column - i); |
| 675 | while (i > 0) { |
| 676 | (void)ttyoutput('\b', tp); |
| 677 | i--; |
| 678 | } |
| 679 | } |
| 680 | } |
| 681 | endcase: |
| 682 | /* |
| 683 | * IXANY means allow any character to restart output. |
| 684 | */ |
| 685 | if (ISSET(tp->t_state, TS_TTSTOP) && |
| 686 | !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) |
| 687 | return (0); |
| 688 | restartoutput: |
| 689 | CLR(tp->t_lflag, FLUSHO); |
| 690 | CLR(tp->t_state, TS_TTSTOP); |
| 691 | startoutput: |
| 692 | return (ttstart(tp)); |
| 693 | } |
| 694 | |
| 695 | /* |
| 696 | * Output a single character on a tty, doing output processing |
| 697 | * as needed (expanding tabs, newline processing, etc.). |
| 698 | * Returns < 0 if succeeds, otherwise returns char to resend. |
| 699 | * Must be recursive. |
| 700 | */ |
| 701 | static int |
| 702 | ttyoutput(int c, struct tty *tp) |
| 703 | { |
| 704 | tcflag_t oflag; |
| 705 | int col; |
| 706 | |
| 707 | oflag = tp->t_oflag; |
| 708 | if (!ISSET(oflag, OPOST)) { |
| 709 | if (ISSET(tp->t_lflag, FLUSHO)) |
| 710 | return (-1); |
| 711 | if (clist_putc(c, &tp->t_outq)) |
| 712 | return (c); |
| 713 | tk_nout++; |
| 714 | tp->t_outcc++; |
| 715 | return (-1); |
| 716 | } |
| 717 | /* |
| 718 | * Do tab expansion if OXTABS is set. Special case if we external |
| 719 | * processing, we don't do the tab expansion because we'll probably |
| 720 | * get it wrong. If tab expansion needs to be done, let it happen |
| 721 | * externally. |
| 722 | */ |
| 723 | CLR(c, ~TTY_CHARMASK); |
| 724 | if (c == '\t' && |
| 725 | ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { |
| 726 | c = 8 - (tp->t_column & 7); |
| 727 | if (!ISSET(tp->t_lflag, FLUSHO)) { |
| 728 | crit_enter(); /* Don't interrupt tabs. */ |
| 729 | c -= b_to_q(" ", c, &tp->t_outq); |
| 730 | tk_nout += c; |
| 731 | tp->t_outcc += c; |
| 732 | crit_exit(); |
| 733 | } |
| 734 | tp->t_column += c; |
| 735 | return (c ? -1 : '\t'); |
| 736 | } |
| 737 | if (c == CEOT && ISSET(oflag, ONOEOT)) |
| 738 | return (-1); |
| 739 | |
| 740 | /* |
| 741 | * Newline translation: if ONLCR is set, |
| 742 | * translate newline into "\r\n". |
| 743 | */ |
| 744 | if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { |
| 745 | tk_nout++; |
| 746 | tp->t_outcc++; |
| 747 | if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc('\r', &tp->t_outq)) |
| 748 | return (c); |
| 749 | } |
| 750 | /* If OCRNL is set, translate "\r" into "\n". */ |
| 751 | else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) |
| 752 | c = '\n'; |
| 753 | /* If ONOCR is set, don't transmit CRs when on column 0. */ |
| 754 | else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) |
| 755 | return (-1); |
| 756 | |
| 757 | tk_nout++; |
| 758 | tp->t_outcc++; |
| 759 | if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc(c, &tp->t_outq)) |
| 760 | return (c); |
| 761 | |
| 762 | col = tp->t_column; |
| 763 | switch (CCLASS(c)) { |
| 764 | case BACKSPACE: |
| 765 | if (col > 0) |
| 766 | --col; |
| 767 | break; |
| 768 | case CONTROL: |
| 769 | break; |
| 770 | case NEWLINE: |
| 771 | if (ISSET(tp->t_oflag, ONLCR | ONLRET)) |
| 772 | col = 0; |
| 773 | break; |
| 774 | case RETURN: |
| 775 | col = 0; |
| 776 | break; |
| 777 | case ORDINARY: |
| 778 | ++col; |
| 779 | break; |
| 780 | case TAB: |
| 781 | col = (col + 8) & ~7; |
| 782 | break; |
| 783 | } |
| 784 | tp->t_column = col; |
| 785 | return (-1); |
| 786 | } |
| 787 | |
| 788 | /* |
| 789 | * Ioctls for all tty devices. Called after line-discipline specific ioctl |
| 790 | * has been called to do discipline-specific functions and/or reject any |
| 791 | * of these ioctl commands. |
| 792 | */ |
| 793 | /* ARGSUSED */ |
| 794 | int |
| 795 | ttioctl(struct tty *tp, u_long cmd, void *data, int flag) |
| 796 | { |
| 797 | struct thread *td = curthread; |
| 798 | struct lwp *lp = td->td_lwp; |
| 799 | struct proc *p = td->td_proc; |
| 800 | int error; |
| 801 | |
| 802 | KKASSERT(p); |
| 803 | |
| 804 | /* If the ioctl involves modification, hang if in the background. */ |
| 805 | switch (cmd) { |
| 806 | case TIOCCBRK: |
| 807 | case TIOCCONS: |
| 808 | case TIOCDRAIN: |
| 809 | case TIOCEXCL: |
| 810 | case TIOCFLUSH: |
| 811 | #ifdef TIOCHPCL |
| 812 | case TIOCHPCL: |
| 813 | #endif |
| 814 | case TIOCNXCL: |
| 815 | case TIOCSBRK: |
| 816 | case TIOCSCTTY: |
| 817 | case TIOCSDRAINWAIT: |
| 818 | case TIOCSETA: |
| 819 | case TIOCSETAF: |
| 820 | case TIOCSETAW: |
| 821 | case TIOCSETD: |
| 822 | case TIOCSPGRP: |
| 823 | case TIOCSTART: |
| 824 | case TIOCSTAT: |
| 825 | case TIOCSTI: |
| 826 | case TIOCSTOP: |
| 827 | case TIOCSWINSZ: |
| 828 | #if defined(COMPAT_43) || defined(COMPAT_SUNOS) |
| 829 | case TIOCLBIC: |
| 830 | case TIOCLBIS: |
| 831 | case TIOCLSET: |
| 832 | case TIOCSETC: |
| 833 | case OTIOCSETD: |
| 834 | case TIOCSETN: |
| 835 | case TIOCSETP: |
| 836 | case TIOCSLTC: |
| 837 | #endif |
| 838 | while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) && |
| 839 | !SIGISMEMBER(p->p_sigignore, SIGTTOU) && |
| 840 | !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) { |
| 841 | if (p->p_pgrp->pg_jobc == 0) |
| 842 | return (EIO); |
| 843 | pgsignal(p->p_pgrp, SIGTTOU, 1); |
| 844 | error = ttysleep(tp, &lbolt, PCATCH, "ttybg1", |
| 845 | 0); |
| 846 | if (error) |
| 847 | return (error); |
| 848 | } |
| 849 | break; |
| 850 | } |
| 851 | |
| 852 | switch (cmd) { /* Process the ioctl. */ |
| 853 | case FIOASYNC: /* set/clear async i/o */ |
| 854 | crit_enter(); |
| 855 | if (*(int *)data) |
| 856 | SET(tp->t_state, TS_ASYNC); |
| 857 | else |
| 858 | CLR(tp->t_state, TS_ASYNC); |
| 859 | crit_exit(); |
| 860 | break; |
| 861 | case FIONREAD: /* get # bytes to read */ |
| 862 | crit_enter(); |
| 863 | *(int *)data = ttnread(tp); |
| 864 | crit_exit(); |
| 865 | break; |
| 866 | |
| 867 | case FIOSETOWN: |
| 868 | /* |
| 869 | * Policy -- Don't allow FIOSETOWN on someone else's |
| 870 | * controlling tty |
| 871 | */ |
| 872 | if (tp->t_session != NULL && !isctty(p, tp)) |
| 873 | return (ENOTTY); |
| 874 | |
| 875 | error = fsetown(*(int *)data, &tp->t_sigio); |
| 876 | if (error) |
| 877 | return (error); |
| 878 | break; |
| 879 | case FIOGETOWN: |
| 880 | if (tp->t_session != NULL && !isctty(p, tp)) |
| 881 | return (ENOTTY); |
| 882 | *(int *)data = fgetown(tp->t_sigio); |
| 883 | break; |
| 884 | |
| 885 | case TIOCEXCL: /* set exclusive use of tty */ |
| 886 | crit_enter(); |
| 887 | SET(tp->t_state, TS_XCLUDE); |
| 888 | crit_exit(); |
| 889 | break; |
| 890 | case TIOCFLUSH: { /* flush buffers */ |
| 891 | int flags = *(int *)data; |
| 892 | |
| 893 | if (flags == 0) |
| 894 | flags = FREAD | FWRITE; |
| 895 | else |
| 896 | flags &= FREAD | FWRITE; |
| 897 | ttyflush(tp, flags); |
| 898 | break; |
| 899 | } |
| 900 | case TIOCCONS: /* become virtual console */ |
| 901 | if (*(int *)data) { |
| 902 | if (constty && constty != tp && |
| 903 | ISSET(constty->t_state, TS_CONNECTED)) |
| 904 | return (EBUSY); |
| 905 | #ifndef UCONSOLE |
| 906 | if ((error = priv_check(td, PRIV_ROOT)) != 0) |
| 907 | return (error); |
| 908 | #endif |
| 909 | constty = tp; |
| 910 | } else if (tp == constty) |
| 911 | constty = NULL; |
| 912 | break; |
| 913 | case TIOCDRAIN: /* wait till output drained */ |
| 914 | error = ttywait(tp); |
| 915 | if (error) |
| 916 | return (error); |
| 917 | break; |
| 918 | case TIOCGETA: { /* get termios struct */ |
| 919 | struct termios *t = (struct termios *)data; |
| 920 | |
| 921 | bcopy(&tp->t_termios, t, sizeof(struct termios)); |
| 922 | break; |
| 923 | } |
| 924 | case TIOCGETD: /* get line discipline */ |
| 925 | *(int *)data = tp->t_line; |
| 926 | break; |
| 927 | case TIOCGWINSZ: /* get window size */ |
| 928 | *(struct winsize *)data = tp->t_winsize; |
| 929 | break; |
| 930 | case TIOCGPGRP: /* get pgrp of tty */ |
| 931 | if (!isctty(p, tp)) |
| 932 | return (ENOTTY); |
| 933 | *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; |
| 934 | break; |
| 935 | case TIOCGSID: /* get sid of tty */ |
| 936 | if (!isctty(p, tp)) |
| 937 | return (ENOTTY); |
| 938 | *(int *)data = tp->t_session->s_sid; |
| 939 | break; |
| 940 | #ifdef TIOCHPCL |
| 941 | case TIOCHPCL: /* hang up on last close */ |
| 942 | crit_enter(); |
| 943 | SET(tp->t_cflag, HUPCL); |
| 944 | crit_exit(); |
| 945 | break; |
| 946 | #endif |
| 947 | case TIOCNXCL: /* reset exclusive use of tty */ |
| 948 | crit_enter(); |
| 949 | CLR(tp->t_state, TS_XCLUDE); |
| 950 | crit_exit(); |
| 951 | break; |
| 952 | case TIOCOUTQ: /* output queue size */ |
| 953 | *(int *)data = tp->t_outq.c_cc; |
| 954 | break; |
| 955 | case TIOCSETA: /* set termios struct */ |
| 956 | case TIOCSETAW: /* drain output, set */ |
| 957 | case TIOCSETAF: { /* drn out, fls in, set */ |
| 958 | struct termios *t = (struct termios *)data; |
| 959 | |
| 960 | if (t->c_ispeed == 0) |
| 961 | t->c_ispeed = t->c_ospeed; |
| 962 | if (t->c_ispeed == 0) |
| 963 | t->c_ispeed = tp->t_ospeed; |
| 964 | if (t->c_ispeed == 0) |
| 965 | return (EINVAL); |
| 966 | crit_enter(); |
| 967 | if (cmd == TIOCSETAW || cmd == TIOCSETAF) { |
| 968 | error = ttywait(tp); |
| 969 | if (error) { |
| 970 | crit_exit(); |
| 971 | return (error); |
| 972 | } |
| 973 | if (cmd == TIOCSETAF) |
| 974 | ttyflush(tp, FREAD); |
| 975 | } |
| 976 | if (!ISSET(t->c_cflag, CIGNORE)) { |
| 977 | /* |
| 978 | * Set device hardware. |
| 979 | */ |
| 980 | if (tp->t_param && (error = (*tp->t_param)(tp, t))) { |
| 981 | crit_exit(); |
| 982 | return (error); |
| 983 | } |
| 984 | if (ISSET(t->c_cflag, CLOCAL) && |
| 985 | !ISSET(tp->t_cflag, CLOCAL)) { |
| 986 | /* |
| 987 | * XXX disconnections would be too hard to |
| 988 | * get rid of without this kludge. The only |
| 989 | * way to get rid of controlling terminals |
| 990 | * is to exit from the session leader. |
| 991 | */ |
| 992 | CLR(tp->t_state, TS_ZOMBIE); |
| 993 | |
| 994 | wakeup(TSA_CARR_ON(tp)); |
| 995 | ttwakeup(tp); |
| 996 | ttwwakeup(tp); |
| 997 | } |
| 998 | if ((ISSET(tp->t_state, TS_CARR_ON) || |
| 999 | ISSET(t->c_cflag, CLOCAL)) && |
| 1000 | !ISSET(tp->t_state, TS_ZOMBIE)) |
| 1001 | SET(tp->t_state, TS_CONNECTED); |
| 1002 | else |
| 1003 | CLR(tp->t_state, TS_CONNECTED); |
| 1004 | tp->t_cflag = t->c_cflag; |
| 1005 | tp->t_ispeed = t->c_ispeed; |
| 1006 | if (t->c_ospeed != 0) |
| 1007 | tp->t_ospeed = t->c_ospeed; |
| 1008 | ttsetwater(tp); |
| 1009 | } |
| 1010 | if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && |
| 1011 | cmd != TIOCSETAF) { |
| 1012 | if (ISSET(t->c_lflag, ICANON)) |
| 1013 | SET(tp->t_lflag, PENDIN); |
| 1014 | else { |
| 1015 | /* |
| 1016 | * XXX we really shouldn't allow toggling |
| 1017 | * ICANON while we're in a non-termios line |
| 1018 | * discipline. Now we have to worry about |
| 1019 | * panicing for a null queue. |
| 1020 | */ |
| 1021 | if (tp->t_canq.c_cbreserved > 0 && |
| 1022 | tp->t_rawq.c_cbreserved > 0) { |
| 1023 | catq(&tp->t_rawq, &tp->t_canq); |
| 1024 | /* |
| 1025 | * XXX the queue limits may be |
| 1026 | * different, so the old queue |
| 1027 | * swapping method no longer works. |
| 1028 | */ |
| 1029 | catq(&tp->t_canq, &tp->t_rawq); |
| 1030 | } |
| 1031 | CLR(tp->t_lflag, PENDIN); |
| 1032 | } |
| 1033 | ttwakeup(tp); |
| 1034 | } |
| 1035 | tp->t_iflag = t->c_iflag; |
| 1036 | tp->t_oflag = t->c_oflag; |
| 1037 | /* |
| 1038 | * Make the EXTPROC bit read only. |
| 1039 | */ |
| 1040 | if (ISSET(tp->t_lflag, EXTPROC)) |
| 1041 | SET(t->c_lflag, EXTPROC); |
| 1042 | else |
| 1043 | CLR(t->c_lflag, EXTPROC); |
| 1044 | tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); |
| 1045 | if (t->c_cc[VMIN] != tp->t_cc[VMIN] || |
| 1046 | t->c_cc[VTIME] != tp->t_cc[VTIME]) |
| 1047 | ttwakeup(tp); |
| 1048 | bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); |
| 1049 | crit_exit(); |
| 1050 | break; |
| 1051 | } |
| 1052 | case TIOCSETD: { /* set line discipline */ |
| 1053 | int t = *(int *)data; |
| 1054 | cdev_t device = tp->t_dev; |
| 1055 | |
| 1056 | if ((u_int)t >= nlinesw) |
| 1057 | return (ENXIO); |
| 1058 | if (t != tp->t_line) { |
| 1059 | crit_enter(); |
| 1060 | (*linesw[tp->t_line].l_close)(tp, flag); |
| 1061 | error = (*linesw[t].l_open)(device, tp); |
| 1062 | if (error) { |
| 1063 | (void)(*linesw[tp->t_line].l_open)(device, tp); |
| 1064 | crit_exit(); |
| 1065 | return (error); |
| 1066 | } |
| 1067 | tp->t_line = t; |
| 1068 | crit_exit(); |
| 1069 | } |
| 1070 | break; |
| 1071 | } |
| 1072 | case TIOCSTART: /* start output, like ^Q */ |
| 1073 | crit_enter(); |
| 1074 | if (ISSET(tp->t_state, TS_TTSTOP) || |
| 1075 | ISSET(tp->t_lflag, FLUSHO)) { |
| 1076 | CLR(tp->t_lflag, FLUSHO); |
| 1077 | CLR(tp->t_state, TS_TTSTOP); |
| 1078 | ttstart(tp); |
| 1079 | } |
| 1080 | crit_exit(); |
| 1081 | break; |
| 1082 | case TIOCSTI: /* simulate terminal input */ |
| 1083 | if ((flag & FREAD) == 0 && priv_check(td, PRIV_ROOT)) |
| 1084 | return (EPERM); |
| 1085 | if (!isctty(p, tp) && priv_check(td, PRIV_ROOT)) |
| 1086 | return (EACCES); |
| 1087 | crit_enter(); |
| 1088 | (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp); |
| 1089 | crit_exit(); |
| 1090 | break; |
| 1091 | case TIOCSTOP: /* stop output, like ^S */ |
| 1092 | crit_enter(); |
| 1093 | if (!ISSET(tp->t_state, TS_TTSTOP)) { |
| 1094 | SET(tp->t_state, TS_TTSTOP); |
| 1095 | (*tp->t_stop)(tp, 0); |
| 1096 | } |
| 1097 | crit_exit(); |
| 1098 | break; |
| 1099 | case TIOCSCTTY: /* become controlling tty */ |
| 1100 | /* Session ctty vnode pointer set in vnode layer. */ |
| 1101 | if (!SESS_LEADER(p) || |
| 1102 | ((p->p_session->s_ttyvp || tp->t_session) && |
| 1103 | (tp->t_session != p->p_session))) |
| 1104 | return (EPERM); |
| 1105 | tp->t_session = p->p_session; |
| 1106 | tp->t_pgrp = p->p_pgrp; |
| 1107 | p->p_session->s_ttyp = tp; |
| 1108 | p->p_flag |= P_CONTROLT; |
| 1109 | break; |
| 1110 | case TIOCSPGRP: { /* set pgrp of tty */ |
| 1111 | pid_t pgid = *(int *)data; |
| 1112 | |
| 1113 | if (!isctty(p, tp)) |
| 1114 | return (ENOTTY); |
| 1115 | else if (pgid < 1 || pgid > PID_MAX) |
| 1116 | return (EINVAL); |
| 1117 | else { |
| 1118 | struct pgrp *pgrp = pgfind(pgid); |
| 1119 | if (pgrp == NULL || pgrp->pg_session != p->p_session) |
| 1120 | return (EPERM); |
| 1121 | |
| 1122 | tp->t_pgrp = pgrp; |
| 1123 | } |
| 1124 | break; |
| 1125 | } |
| 1126 | case TIOCSTAT: /* simulate control-T */ |
| 1127 | crit_enter(); |
| 1128 | ttyinfo(tp); |
| 1129 | crit_exit(); |
| 1130 | break; |
| 1131 | case TIOCSWINSZ: /* set window size */ |
| 1132 | if (bcmp((caddr_t)&tp->t_winsize, data, |
| 1133 | sizeof (struct winsize))) { |
| 1134 | tp->t_winsize = *(struct winsize *)data; |
| 1135 | pgsignal(tp->t_pgrp, SIGWINCH, 1); |
| 1136 | } |
| 1137 | break; |
| 1138 | case TIOCSDRAINWAIT: |
| 1139 | error = priv_check(td, PRIV_ROOT); |
| 1140 | if (error) |
| 1141 | return (error); |
| 1142 | tp->t_timeout = *(int *)data * hz; |
| 1143 | wakeup(TSA_OCOMPLETE(tp)); |
| 1144 | wakeup(TSA_OLOWAT(tp)); |
| 1145 | break; |
| 1146 | case TIOCGDRAINWAIT: |
| 1147 | *(int *)data = tp->t_timeout / hz; |
| 1148 | break; |
| 1149 | default: |
| 1150 | #if defined(COMPAT_43) || defined(COMPAT_SUNOS) |
| 1151 | return (ttcompat(tp, cmd, data, flag)); |
| 1152 | #else |
| 1153 | return (ENOIOCTL); |
| 1154 | #endif |
| 1155 | } |
| 1156 | return (0); |
| 1157 | } |
| 1158 | |
| 1159 | static struct filterops ttyread_filtops = |
| 1160 | { FILTEROP_ISFD, NULL, filt_ttyrdetach, filt_ttyread }; |
| 1161 | static struct filterops ttywrite_filtops = |
| 1162 | { FILTEROP_ISFD, NULL, filt_ttywdetach, filt_ttywrite }; |
| 1163 | |
| 1164 | int |
| 1165 | ttykqfilter(struct dev_kqfilter_args *ap) |
| 1166 | { |
| 1167 | cdev_t dev = ap->a_head.a_dev; |
| 1168 | struct knote *kn = ap->a_kn; |
| 1169 | struct tty *tp = dev->si_tty; |
| 1170 | struct klist *klist; |
| 1171 | |
| 1172 | ap->a_result = 0; |
| 1173 | switch (kn->kn_filter) { |
| 1174 | case EVFILT_READ: |
| 1175 | klist = &tp->t_rkq.ki_note; |
| 1176 | kn->kn_fop = &ttyread_filtops; |
| 1177 | break; |
| 1178 | case EVFILT_WRITE: |
| 1179 | klist = &tp->t_wkq.ki_note; |
| 1180 | kn->kn_fop = &ttywrite_filtops; |
| 1181 | break; |
| 1182 | default: |
| 1183 | ap->a_result = EOPNOTSUPP; |
| 1184 | return (0); |
| 1185 | } |
| 1186 | |
| 1187 | kn->kn_hook = (caddr_t)dev; |
| 1188 | knote_insert(klist, kn); |
| 1189 | |
| 1190 | return (0); |
| 1191 | } |
| 1192 | |
| 1193 | static void |
| 1194 | filt_ttyrdetach(struct knote *kn) |
| 1195 | { |
| 1196 | struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty; |
| 1197 | |
| 1198 | knote_remove(&tp->t_rkq.ki_note, kn); |
| 1199 | } |
| 1200 | |
| 1201 | static int |
| 1202 | filt_ttyread(struct knote *kn, long hint) |
| 1203 | { |
| 1204 | struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty; |
| 1205 | |
| 1206 | kn->kn_data = ttnread(tp); |
| 1207 | if (ISSET(tp->t_state, TS_ZOMBIE)) { |
| 1208 | kn->kn_flags |= EV_EOF; |
| 1209 | return (1); |
| 1210 | } |
| 1211 | return (kn->kn_data > 0); |
| 1212 | } |
| 1213 | |
| 1214 | static void |
| 1215 | filt_ttywdetach(struct knote *kn) |
| 1216 | { |
| 1217 | struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty; |
| 1218 | |
| 1219 | knote_remove(&tp->t_wkq.ki_note, kn); |
| 1220 | } |
| 1221 | |
| 1222 | static int |
| 1223 | filt_ttywrite(struct knote *kn, long hint) |
| 1224 | { |
| 1225 | struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty; |
| 1226 | |
| 1227 | kn->kn_data = tp->t_outq.c_cc; |
| 1228 | if (ISSET(tp->t_state, TS_ZOMBIE)) |
| 1229 | return (1); |
| 1230 | return (kn->kn_data <= tp->t_olowat && |
| 1231 | ISSET(tp->t_state, TS_CONNECTED)); |
| 1232 | } |
| 1233 | |
| 1234 | /* |
| 1235 | * Must be called while in a critical section. |
| 1236 | */ |
| 1237 | static int |
| 1238 | ttnread(struct tty *tp) |
| 1239 | { |
| 1240 | int nread; |
| 1241 | |
| 1242 | if (ISSET(tp->t_lflag, PENDIN)) |
| 1243 | ttypend(tp); |
| 1244 | nread = tp->t_canq.c_cc; |
| 1245 | if (!ISSET(tp->t_lflag, ICANON)) { |
| 1246 | nread += tp->t_rawq.c_cc; |
| 1247 | if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) |
| 1248 | nread = 0; |
| 1249 | } |
| 1250 | return (nread); |
| 1251 | } |
| 1252 | |
| 1253 | /* |
| 1254 | * Wait for output to drain. |
| 1255 | */ |
| 1256 | int |
| 1257 | ttywait(struct tty *tp) |
| 1258 | { |
| 1259 | int error; |
| 1260 | |
| 1261 | error = 0; |
| 1262 | crit_enter(); |
| 1263 | while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && |
| 1264 | ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { |
| 1265 | (*tp->t_oproc)(tp); |
| 1266 | if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && |
| 1267 | ISSET(tp->t_state, TS_CONNECTED)) { |
| 1268 | SET(tp->t_state, TS_SO_OCOMPLETE); |
| 1269 | error = ttysleep(tp, TSA_OCOMPLETE(tp), |
| 1270 | PCATCH, "ttywai", |
| 1271 | tp->t_timeout); |
| 1272 | if (error) { |
| 1273 | if (error == EWOULDBLOCK) |
| 1274 | error = EIO; |
| 1275 | break; |
| 1276 | } |
| 1277 | } else |
| 1278 | break; |
| 1279 | } |
| 1280 | if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) |
| 1281 | error = EIO; |
| 1282 | crit_exit(); |
| 1283 | return (error); |
| 1284 | } |
| 1285 | |
| 1286 | /* |
| 1287 | * Flush if successfully wait. |
| 1288 | */ |
| 1289 | static int |
| 1290 | ttywflush(struct tty *tp) |
| 1291 | { |
| 1292 | int error; |
| 1293 | |
| 1294 | if ((error = ttywait(tp)) == 0) |
| 1295 | ttyflush(tp, FREAD); |
| 1296 | return (error); |
| 1297 | } |
| 1298 | |
| 1299 | /* |
| 1300 | * Flush tty read and/or write queues, notifying anyone waiting. |
| 1301 | */ |
| 1302 | void |
| 1303 | ttyflush(struct tty *tp, int rw) |
| 1304 | { |
| 1305 | crit_enter(); |
| 1306 | #if 0 |
| 1307 | again: |
| 1308 | #endif |
| 1309 | if (rw & FWRITE) { |
| 1310 | FLUSHQ(&tp->t_outq); |
| 1311 | CLR(tp->t_state, TS_TTSTOP); |
| 1312 | } |
| 1313 | (*tp->t_stop)(tp, rw); |
| 1314 | if (rw & FREAD) { |
| 1315 | FLUSHQ(&tp->t_canq); |
| 1316 | FLUSHQ(&tp->t_rawq); |
| 1317 | CLR(tp->t_lflag, PENDIN); |
| 1318 | tp->t_rocount = 0; |
| 1319 | tp->t_rocol = 0; |
| 1320 | CLR(tp->t_state, TS_LOCAL); |
| 1321 | ttwakeup(tp); |
| 1322 | if (ISSET(tp->t_state, TS_TBLOCK)) { |
| 1323 | if (rw & FWRITE) |
| 1324 | FLUSHQ(&tp->t_outq); |
| 1325 | ttyunblock(tp); |
| 1326 | |
| 1327 | /* |
| 1328 | * Don't let leave any state that might clobber the |
| 1329 | * next line discipline (although we should do more |
| 1330 | * to send the START char). Not clearing the state |
| 1331 | * may have caused the "putc to a clist with no |
| 1332 | * reserved cblocks" panic/kprintf. |
| 1333 | */ |
| 1334 | CLR(tp->t_state, TS_TBLOCK); |
| 1335 | |
| 1336 | #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ |
| 1337 | if (ISSET(tp->t_iflag, IXOFF)) { |
| 1338 | /* |
| 1339 | * XXX wait a bit in the hope that the stop |
| 1340 | * character (if any) will go out. Waiting |
| 1341 | * isn't good since it allows races. This |
| 1342 | * will be fixed when the stop character is |
| 1343 | * put in a special queue. Don't bother with |
| 1344 | * the checks in ttywait() since the timeout |
| 1345 | * will save us. |
| 1346 | */ |
| 1347 | SET(tp->t_state, TS_SO_OCOMPLETE); |
| 1348 | ttysleep(tp, TSA_OCOMPLETE(tp), 0, |
| 1349 | "ttyfls", hz / 10); |
| 1350 | /* |
| 1351 | * Don't try sending the stop character again. |
| 1352 | */ |
| 1353 | CLR(tp->t_state, TS_TBLOCK); |
| 1354 | goto again; |
| 1355 | } |
| 1356 | #endif |
| 1357 | } |
| 1358 | } |
| 1359 | if (rw & FWRITE) { |
| 1360 | FLUSHQ(&tp->t_outq); |
| 1361 | ttwwakeup(tp); |
| 1362 | } |
| 1363 | crit_exit(); |
| 1364 | } |
| 1365 | |
| 1366 | /* |
| 1367 | * Copy in the default termios characters. |
| 1368 | */ |
| 1369 | void |
| 1370 | termioschars(struct termios *t) |
| 1371 | { |
| 1372 | |
| 1373 | bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); |
| 1374 | } |
| 1375 | |
| 1376 | /* |
| 1377 | * Old interface. |
| 1378 | */ |
| 1379 | void |
| 1380 | ttychars(struct tty *tp) |
| 1381 | { |
| 1382 | |
| 1383 | termioschars(&tp->t_termios); |
| 1384 | } |
| 1385 | |
| 1386 | /* |
| 1387 | * Handle input high water. Send stop character for the IXOFF case. Turn |
| 1388 | * on our input flow control bit and propagate the changes to the driver. |
| 1389 | * XXX the stop character should be put in a special high priority queue. |
| 1390 | */ |
| 1391 | void |
| 1392 | ttyblock(struct tty *tp) |
| 1393 | { |
| 1394 | |
| 1395 | SET(tp->t_state, TS_TBLOCK); |
| 1396 | if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && |
| 1397 | clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) |
| 1398 | CLR(tp->t_state, TS_TBLOCK); /* try again later */ |
| 1399 | ttstart(tp); |
| 1400 | } |
| 1401 | |
| 1402 | /* |
| 1403 | * Handle input low water. Send start character for the IXOFF case. Turn |
| 1404 | * off our input flow control bit and propagate the changes to the driver. |
| 1405 | * XXX the start character should be put in a special high priority queue. |
| 1406 | */ |
| 1407 | static void |
| 1408 | ttyunblock(struct tty *tp) |
| 1409 | { |
| 1410 | |
| 1411 | CLR(tp->t_state, TS_TBLOCK); |
| 1412 | if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && |
| 1413 | clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0) |
| 1414 | SET(tp->t_state, TS_TBLOCK); /* try again later */ |
| 1415 | ttstart(tp); |
| 1416 | } |
| 1417 | |
| 1418 | #ifdef notyet |
| 1419 | /* Not used by any current (i386) drivers. */ |
| 1420 | /* |
| 1421 | * Restart after an inter-char delay. |
| 1422 | */ |
| 1423 | void |
| 1424 | ttrstrt(void *tp_arg) |
| 1425 | { |
| 1426 | struct tty *tp; |
| 1427 | |
| 1428 | KASSERT(tp_arg != NULL, ("ttrstrt")); |
| 1429 | |
| 1430 | tp = tp_arg; |
| 1431 | crit_enter(); |
| 1432 | CLR(tp->t_state, TS_TIMEOUT); |
| 1433 | ttstart(tp); |
| 1434 | crit_exit(); |
| 1435 | } |
| 1436 | #endif |
| 1437 | |
| 1438 | int |
| 1439 | ttstart(struct tty *tp) |
| 1440 | { |
| 1441 | |
| 1442 | if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ |
| 1443 | (*tp->t_oproc)(tp); |
| 1444 | return (0); |
| 1445 | } |
| 1446 | |
| 1447 | /* |
| 1448 | * "close" a line discipline |
| 1449 | */ |
| 1450 | int |
| 1451 | ttylclose(struct tty *tp, int flag) |
| 1452 | { |
| 1453 | |
| 1454 | if (flag & FNONBLOCK || ttywflush(tp)) |
| 1455 | ttyflush(tp, FREAD | FWRITE); |
| 1456 | return (0); |
| 1457 | } |
| 1458 | |
| 1459 | /* |
| 1460 | * Handle modem control transition on a tty. |
| 1461 | * Flag indicates new state of carrier. |
| 1462 | * Returns 0 if the line should be turned off, otherwise 1. |
| 1463 | */ |
| 1464 | int |
| 1465 | ttymodem(struct tty *tp, int flag) |
| 1466 | { |
| 1467 | |
| 1468 | if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { |
| 1469 | /* |
| 1470 | * MDMBUF: do flow control according to carrier flag |
| 1471 | * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP |
| 1472 | * works if IXON and IXANY are clear. |
| 1473 | */ |
| 1474 | if (flag) { |
| 1475 | CLR(tp->t_state, TS_CAR_OFLOW); |
| 1476 | CLR(tp->t_state, TS_TTSTOP); |
| 1477 | ttstart(tp); |
| 1478 | } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { |
| 1479 | SET(tp->t_state, TS_CAR_OFLOW); |
| 1480 | SET(tp->t_state, TS_TTSTOP); |
| 1481 | (*tp->t_stop)(tp, 0); |
| 1482 | } |
| 1483 | } else if (flag == 0) { |
| 1484 | /* |
| 1485 | * Lost carrier. |
| 1486 | */ |
| 1487 | CLR(tp->t_state, TS_CARR_ON); |
| 1488 | if (ISSET(tp->t_state, TS_ISOPEN) && |
| 1489 | !ISSET(tp->t_cflag, CLOCAL)) { |
| 1490 | SET(tp->t_state, TS_ZOMBIE); |
| 1491 | CLR(tp->t_state, TS_CONNECTED); |
| 1492 | if (tp->t_session && tp->t_session->s_leader) |
| 1493 | ksignal(tp->t_session->s_leader, SIGHUP); |
| 1494 | ttyflush(tp, FREAD | FWRITE); |
| 1495 | return (0); |
| 1496 | } |
| 1497 | } else { |
| 1498 | /* |
| 1499 | * Carrier now on. |
| 1500 | */ |
| 1501 | SET(tp->t_state, TS_CARR_ON); |
| 1502 | if (!ISSET(tp->t_state, TS_ZOMBIE)) |
| 1503 | SET(tp->t_state, TS_CONNECTED); |
| 1504 | wakeup(TSA_CARR_ON(tp)); |
| 1505 | ttwakeup(tp); |
| 1506 | ttwwakeup(tp); |
| 1507 | } |
| 1508 | return (1); |
| 1509 | } |
| 1510 | |
| 1511 | /* |
| 1512 | * Reinput pending characters after state switch |
| 1513 | * call from a critical section. |
| 1514 | */ |
| 1515 | static void |
| 1516 | ttypend(struct tty *tp) |
| 1517 | { |
| 1518 | struct clist tq; |
| 1519 | int c; |
| 1520 | |
| 1521 | CLR(tp->t_lflag, PENDIN); |
| 1522 | SET(tp->t_state, TS_TYPEN); |
| 1523 | /* |
| 1524 | * XXX this assumes too much about clist internals. It may even |
| 1525 | * fail if the cblock slush pool is empty. We can't allocate more |
| 1526 | * cblocks here because we are called from an interrupt handler |
| 1527 | * and clist_alloc_cblocks() can wait. |
| 1528 | */ |
| 1529 | tq = tp->t_rawq; |
| 1530 | bzero(&tp->t_rawq, sizeof tp->t_rawq); |
| 1531 | tp->t_rawq.c_cbmax = tq.c_cbmax; |
| 1532 | tp->t_rawq.c_cbreserved = tq.c_cbreserved; |
| 1533 | while ((c = clist_getc(&tq)) >= 0) |
| 1534 | ttyinput(c, tp); |
| 1535 | CLR(tp->t_state, TS_TYPEN); |
| 1536 | } |
| 1537 | |
| 1538 | /* |
| 1539 | * Process a read call on a tty device. |
| 1540 | */ |
| 1541 | int |
| 1542 | ttread(struct tty *tp, struct uio *uio, int flag) |
| 1543 | { |
| 1544 | struct clist *qp; |
| 1545 | int c; |
| 1546 | tcflag_t lflag; |
| 1547 | cc_t *cc = tp->t_cc; |
| 1548 | struct proc *pp; |
| 1549 | struct lwp *lp; |
| 1550 | int first, error = 0; |
| 1551 | int has_stime = 0, last_cc = 0; |
| 1552 | long slp = 0; /* XXX this should be renamed `timo'. */ |
| 1553 | struct timeval stime; |
| 1554 | |
| 1555 | lp = curthread->td_lwp; |
| 1556 | stime.tv_sec = 0; /* fix compiler warnings */ |
| 1557 | stime.tv_usec = 0; |
| 1558 | |
| 1559 | loop: |
| 1560 | crit_enter(); |
| 1561 | lflag = tp->t_lflag; |
| 1562 | /* |
| 1563 | * take pending input first |
| 1564 | */ |
| 1565 | if (ISSET(lflag, PENDIN)) { |
| 1566 | ttypend(tp); |
| 1567 | splz(); /* reduce latency */ |
| 1568 | lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ |
| 1569 | } |
| 1570 | |
| 1571 | /* |
| 1572 | * Hang process if it's in the background. |
| 1573 | */ |
| 1574 | if ((pp = curproc) && isbackground(pp, tp)) { |
| 1575 | crit_exit(); |
| 1576 | if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) || |
| 1577 | SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) || |
| 1578 | (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0) |
| 1579 | return (EIO); |
| 1580 | pgsignal(pp->p_pgrp, SIGTTIN, 1); |
| 1581 | error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0); |
| 1582 | if (error) |
| 1583 | return (error); |
| 1584 | goto loop; |
| 1585 | } |
| 1586 | |
| 1587 | if (ISSET(tp->t_state, TS_ZOMBIE)) { |
| 1588 | crit_exit(); |
| 1589 | return (0); /* EOF */ |
| 1590 | } |
| 1591 | |
| 1592 | /* |
| 1593 | * If canonical, use the canonical queue, |
| 1594 | * else use the raw queue. |
| 1595 | * |
| 1596 | * (should get rid of clists...) |
| 1597 | */ |
| 1598 | qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; |
| 1599 | |
| 1600 | if (flag & IO_NDELAY) { |
| 1601 | if (qp->c_cc > 0) |
| 1602 | goto read; |
| 1603 | if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { |
| 1604 | crit_exit(); |
| 1605 | return (0); |
| 1606 | } |
| 1607 | crit_exit(); |
| 1608 | return (EWOULDBLOCK); |
| 1609 | } |
| 1610 | if (!ISSET(lflag, ICANON)) { |
| 1611 | int m = cc[VMIN]; |
| 1612 | long t = cc[VTIME]; |
| 1613 | struct timeval timecopy; |
| 1614 | |
| 1615 | /* |
| 1616 | * Check each of the four combinations. |
| 1617 | * (m > 0 && t == 0) is the normal read case. |
| 1618 | * It should be fairly efficient, so we check that and its |
| 1619 | * companion case (m == 0 && t == 0) first. |
| 1620 | * For the other two cases, we compute the target sleep time |
| 1621 | * into slp. |
| 1622 | */ |
| 1623 | if (t == 0) { |
| 1624 | if (qp->c_cc < m) |
| 1625 | goto sleep; |
| 1626 | if (qp->c_cc > 0) |
| 1627 | goto read; |
| 1628 | |
| 1629 | /* m, t and qp->c_cc are all 0. 0 is enough input. */ |
| 1630 | crit_exit(); |
| 1631 | return (0); |
| 1632 | } |
| 1633 | t *= 100000; /* time in us */ |
| 1634 | #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ |
| 1635 | ((t1).tv_usec - (t2).tv_usec)) |
| 1636 | if (m > 0) { |
| 1637 | if (qp->c_cc <= 0) |
| 1638 | goto sleep; |
| 1639 | if (qp->c_cc >= m) |
| 1640 | goto read; |
| 1641 | getmicrotime(&timecopy); |
| 1642 | if (has_stime == 0) { |
| 1643 | /* first character, start timer */ |
| 1644 | has_stime = 1; |
| 1645 | stime = timecopy; |
| 1646 | slp = t; |
| 1647 | } else if (qp->c_cc > last_cc) { |
| 1648 | /* got a character, restart timer */ |
| 1649 | stime = timecopy; |
| 1650 | slp = t; |
| 1651 | } else { |
| 1652 | /* nothing, check expiration */ |
| 1653 | slp = t - diff(timecopy, stime); |
| 1654 | if (slp <= 0) |
| 1655 | goto read; |
| 1656 | } |
| 1657 | last_cc = qp->c_cc; |
| 1658 | } else { /* m == 0 */ |
| 1659 | if (qp->c_cc > 0) |
| 1660 | goto read; |
| 1661 | getmicrotime(&timecopy); |
| 1662 | if (has_stime == 0) { |
| 1663 | has_stime = 1; |
| 1664 | stime = timecopy; |
| 1665 | slp = t; |
| 1666 | } else { |
| 1667 | slp = t - diff(timecopy, stime); |
| 1668 | if (slp <= 0) { |
| 1669 | /* Timed out, but 0 is enough input. */ |
| 1670 | crit_exit(); |
| 1671 | return (0); |
| 1672 | } |
| 1673 | } |
| 1674 | } |
| 1675 | #undef diff |
| 1676 | /* |
| 1677 | * Rounding down may make us wake up just short |
| 1678 | * of the target, so we round up. |
| 1679 | * The formula is ceiling(slp * hz/1000000). |
| 1680 | * 32-bit arithmetic is enough for hz < 169. |
| 1681 | * XXX see tvtohz() for how to avoid overflow if hz |
| 1682 | * is large (divide by `tick' and/or arrange to |
| 1683 | * use tvtohz() if hz is large). |
| 1684 | */ |
| 1685 | slp = (long) (((u_long)slp * hz) + 999999) / 1000000; |
| 1686 | goto sleep; |
| 1687 | } |
| 1688 | if (qp->c_cc <= 0) { |
| 1689 | sleep: |
| 1690 | /* |
| 1691 | * There is no input, or not enough input and we can block. |
| 1692 | */ |
| 1693 | error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH, |
| 1694 | ISSET(tp->t_state, TS_CONNECTED) ? |
| 1695 | "ttyin" : "ttyhup", (int)slp); |
| 1696 | crit_exit(); |
| 1697 | if (error == EWOULDBLOCK) |
| 1698 | error = 0; |
| 1699 | else if (error) |
| 1700 | return (error); |
| 1701 | /* |
| 1702 | * XXX what happens if another process eats some input |
| 1703 | * while we are asleep (not just here)? It would be |
| 1704 | * safest to detect changes and reset our state variables |
| 1705 | * (has_stime and last_cc). |
| 1706 | */ |
| 1707 | slp = 0; |
| 1708 | goto loop; |
| 1709 | } |
| 1710 | read: |
| 1711 | crit_exit(); |
| 1712 | /* |
| 1713 | * Input present, check for input mapping and processing. |
| 1714 | */ |
| 1715 | first = 1; |
| 1716 | if (ISSET(lflag, ICANON | ISIG)) |
| 1717 | goto slowcase; |
| 1718 | for (;;) { |
| 1719 | char ibuf[IBUFSIZ]; |
| 1720 | int icc; |
| 1721 | |
| 1722 | icc = (int)szmin(uio->uio_resid, IBUFSIZ); |
| 1723 | icc = q_to_b(qp, ibuf, icc); |
| 1724 | if (icc <= 0) { |
| 1725 | if (first) |
| 1726 | goto loop; |
| 1727 | break; |
| 1728 | } |
| 1729 | error = uiomove(ibuf, (size_t)icc, uio); |
| 1730 | /* |
| 1731 | * XXX if there was an error then we should ungetc() the |
| 1732 | * unmoved chars and reduce icc here. |
| 1733 | */ |
| 1734 | if (error) |
| 1735 | break; |
| 1736 | if (uio->uio_resid == 0) |
| 1737 | break; |
| 1738 | first = 0; |
| 1739 | } |
| 1740 | goto out; |
| 1741 | slowcase: |
| 1742 | for (;;) { |
| 1743 | c = clist_getc(qp); |
| 1744 | if (c < 0) { |
| 1745 | if (first) |
| 1746 | goto loop; |
| 1747 | break; |
| 1748 | } |
| 1749 | /* |
| 1750 | * delayed suspend (^Y) |
| 1751 | */ |
| 1752 | if (CCEQ(cc[VDSUSP], c) && |
| 1753 | ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { |
| 1754 | pgsignal(tp->t_pgrp, SIGTSTP, 1); |
| 1755 | if (first) { |
| 1756 | error = ttysleep(tp, &lbolt, PCATCH, |
| 1757 | "ttybg3", 0); |
| 1758 | if (error) |
| 1759 | break; |
| 1760 | goto loop; |
| 1761 | } |
| 1762 | break; |
| 1763 | } |
| 1764 | /* |
| 1765 | * Interpret EOF only in canonical mode. |
| 1766 | */ |
| 1767 | if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) |
| 1768 | break; |
| 1769 | /* |
| 1770 | * Give user character. |
| 1771 | */ |
| 1772 | error = ureadc(c, uio); |
| 1773 | if (error) |
| 1774 | /* XXX should ungetc(c, qp). */ |
| 1775 | break; |
| 1776 | if (uio->uio_resid == 0) |
| 1777 | break; |
| 1778 | /* |
| 1779 | * In canonical mode check for a "break character" |
| 1780 | * marking the end of a "line of input". |
| 1781 | */ |
| 1782 | if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) |
| 1783 | break; |
| 1784 | first = 0; |
| 1785 | } |
| 1786 | |
| 1787 | out: |
| 1788 | /* |
| 1789 | * Look to unblock input now that (presumably) |
| 1790 | * the input queue has gone down. |
| 1791 | */ |
| 1792 | crit_enter(); |
| 1793 | if (ISSET(tp->t_state, TS_TBLOCK) && |
| 1794 | tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat) |
| 1795 | ttyunblock(tp); |
| 1796 | crit_exit(); |
| 1797 | |
| 1798 | return (error); |
| 1799 | } |
| 1800 | |
| 1801 | /* |
| 1802 | * Check the output queue on tp for space for a kernel message (from uprintf |
| 1803 | * or tprintf). Allow some space over the normal hiwater mark so we don't |
| 1804 | * lose messages due to normal flow control, but don't let the tty run amok. |
| 1805 | * Sleeps here are not interruptible, but we return prematurely if new signals |
| 1806 | * arrive. |
| 1807 | */ |
| 1808 | int |
| 1809 | ttycheckoutq(struct tty *tp, int wait) |
| 1810 | { |
| 1811 | struct lwp *lp = curthread->td_lwp; |
| 1812 | int hiwat; |
| 1813 | sigset_t oldset, newset; |
| 1814 | |
| 1815 | hiwat = tp->t_ohiwat; |
| 1816 | SIGEMPTYSET(oldset); |
| 1817 | SIGEMPTYSET(newset); |
| 1818 | crit_enter(); |
| 1819 | if (wait) |
| 1820 | oldset = lwp_sigpend(lp); |
| 1821 | if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) { |
| 1822 | while (tp->t_outq.c_cc > hiwat) { |
| 1823 | ttstart(tp); |
| 1824 | if (tp->t_outq.c_cc <= hiwat) |
| 1825 | break; |
| 1826 | if (wait) |
| 1827 | newset = lwp_sigpend(lp); |
| 1828 | if (!wait || SIGSETNEQ(oldset, newset)) { |
| 1829 | crit_exit(); |
| 1830 | return (0); |
| 1831 | } |
| 1832 | SET(tp->t_state, TS_SO_OLOWAT); |
| 1833 | tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz); |
| 1834 | } |
| 1835 | } |
| 1836 | crit_exit(); |
| 1837 | return (1); |
| 1838 | } |
| 1839 | |
| 1840 | /* |
| 1841 | * Process a write call on a tty device. |
| 1842 | */ |
| 1843 | int |
| 1844 | ttwrite(struct tty *tp, struct uio *uio, int flag) |
| 1845 | { |
| 1846 | char *cp = NULL; |
| 1847 | int cc, ce; |
| 1848 | struct proc *pp; |
| 1849 | struct lwp *lp; |
| 1850 | int i, hiwat, error; |
| 1851 | size_t cnt; |
| 1852 | |
| 1853 | char obuf[OBUFSIZ]; |
| 1854 | |
| 1855 | lp = curthread->td_lwp; |
| 1856 | hiwat = tp->t_ohiwat; |
| 1857 | cnt = uio->uio_resid; |
| 1858 | error = 0; |
| 1859 | cc = 0; |
| 1860 | loop: |
| 1861 | crit_enter(); |
| 1862 | if (ISSET(tp->t_state, TS_ZOMBIE)) { |
| 1863 | crit_exit(); |
| 1864 | if (uio->uio_resid == cnt) |
| 1865 | error = EIO; |
| 1866 | goto out; |
| 1867 | } |
| 1868 | if (!ISSET(tp->t_state, TS_CONNECTED)) { |
| 1869 | if (flag & IO_NDELAY) { |
| 1870 | crit_exit(); |
| 1871 | error = EWOULDBLOCK; |
| 1872 | goto out; |
| 1873 | } |
| 1874 | error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0); |
| 1875 | crit_exit(); |
| 1876 | if (error) |
| 1877 | goto out; |
| 1878 | goto loop; |
| 1879 | } |
| 1880 | crit_exit(); |
| 1881 | |
| 1882 | /* |
| 1883 | * Hang the process if it's in the background. |
| 1884 | */ |
| 1885 | if ((pp = curproc) && isbackground(pp, tp) && |
| 1886 | ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) && |
| 1887 | !SIGISMEMBER(pp->p_sigignore, SIGTTOU) && |
| 1888 | !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) { |
| 1889 | if (pp->p_pgrp->pg_jobc == 0) { |
| 1890 | error = EIO; |
| 1891 | goto out; |
| 1892 | } |
| 1893 | pgsignal(pp->p_pgrp, SIGTTOU, 1); |
| 1894 | error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0); |
| 1895 | if (error) |
| 1896 | goto out; |
| 1897 | goto loop; |
| 1898 | } |
| 1899 | /* |
| 1900 | * Process the user's data in at most OBUFSIZ chunks. Perform any |
| 1901 | * output translation. Keep track of high water mark, sleep on |
| 1902 | * overflow awaiting device aid in acquiring new space. |
| 1903 | */ |
| 1904 | while (uio->uio_resid > 0 || cc > 0) { |
| 1905 | if (ISSET(tp->t_lflag, FLUSHO)) { |
| 1906 | uio->uio_resid = 0; |
| 1907 | return (0); |
| 1908 | } |
| 1909 | if (tp->t_outq.c_cc > hiwat) |
| 1910 | goto ovhiwat; |
| 1911 | /* |
| 1912 | * Grab a hunk of data from the user, unless we have some |
| 1913 | * leftover from last time. |
| 1914 | */ |
| 1915 | if (cc == 0) { |
| 1916 | cc = szmin(uio->uio_resid, OBUFSIZ); |
| 1917 | cp = obuf; |
| 1918 | error = uiomove(cp, (size_t)cc, uio); |
| 1919 | if (error) { |
| 1920 | cc = 0; |
| 1921 | break; |
| 1922 | } |
| 1923 | } |
| 1924 | /* |
| 1925 | * If nothing fancy need be done, grab those characters we |
| 1926 | * can handle without any of ttyoutput's processing and |
| 1927 | * just transfer them to the output q. For those chars |
| 1928 | * which require special processing (as indicated by the |
| 1929 | * bits in char_type), call ttyoutput. After processing |
| 1930 | * a hunk of data, look for FLUSHO so ^O's will take effect |
| 1931 | * immediately. |
| 1932 | */ |
| 1933 | while (cc > 0) { |
| 1934 | if (!ISSET(tp->t_oflag, OPOST)) |
| 1935 | ce = cc; |
| 1936 | else { |
| 1937 | ce = cc - scanc((u_int)cc, (u_char *)cp, |
| 1938 | char_type, CCLASSMASK); |
| 1939 | /* |
| 1940 | * If ce is zero, then we're processing |
| 1941 | * a special character through ttyoutput. |
| 1942 | */ |
| 1943 | if (ce == 0) { |
| 1944 | tp->t_rocount = 0; |
| 1945 | if (ttyoutput(*cp, tp) >= 0) { |
| 1946 | /* No Clists, wait a bit. */ |
| 1947 | ttstart(tp); |
| 1948 | if (flag & IO_NDELAY) { |
| 1949 | error = EWOULDBLOCK; |
| 1950 | goto out; |
| 1951 | } |
| 1952 | error = ttysleep(tp, &lbolt, |
| 1953 | PCATCH, |
| 1954 | "ttybf1", 0); |
| 1955 | if (error) |
| 1956 | goto out; |
| 1957 | goto loop; |
| 1958 | } |
| 1959 | cp++; |
| 1960 | cc--; |
| 1961 | if (ISSET(tp->t_lflag, FLUSHO) || |
| 1962 | tp->t_outq.c_cc > hiwat) |
| 1963 | goto ovhiwat; |
| 1964 | continue; |
| 1965 | } |
| 1966 | } |
| 1967 | /* |
| 1968 | * A bunch of normal characters have been found. |
| 1969 | * Transfer them en masse to the output queue and |
| 1970 | * continue processing at the top of the loop. |
| 1971 | * If there are any further characters in this |
| 1972 | * <= OBUFSIZ chunk, the first should be a character |
| 1973 | * requiring special handling by ttyoutput. |
| 1974 | */ |
| 1975 | tp->t_rocount = 0; |
| 1976 | i = b_to_q(cp, ce, &tp->t_outq); |
| 1977 | ce -= i; |
| 1978 | tp->t_column += ce; |
| 1979 | cp += ce, cc -= ce, tk_nout += ce; |
| 1980 | tp->t_outcc += ce; |
| 1981 | if (i > 0) { |
| 1982 | /* No Clists, wait a bit. */ |
| 1983 | ttstart(tp); |
| 1984 | if (flag & IO_NDELAY) { |
| 1985 | error = EWOULDBLOCK; |
| 1986 | goto out; |
| 1987 | } |
| 1988 | error = ttysleep(tp, &lbolt, PCATCH, |
| 1989 | "ttybf2", 0); |
| 1990 | if (error) |
| 1991 | goto out; |
| 1992 | goto loop; |
| 1993 | } |
| 1994 | if (ISSET(tp->t_lflag, FLUSHO) || |
| 1995 | tp->t_outq.c_cc > hiwat) |
| 1996 | break; |
| 1997 | } |
| 1998 | ttstart(tp); |
| 1999 | } |
| 2000 | out: |
| 2001 | /* |
| 2002 | * If cc is nonzero, we leave the uio structure inconsistent, as the |
| 2003 | * offset and iov pointers have moved forward, but it doesn't matter |
| 2004 | * (the call will either return short or restart with a new uio). |
| 2005 | */ |
| 2006 | uio->uio_resid += cc; |
| 2007 | return (error); |
| 2008 | |
| 2009 | ovhiwat: |
| 2010 | ttstart(tp); |
| 2011 | crit_enter(); |
| 2012 | /* |
| 2013 | * This can only occur if FLUSHO is set in t_lflag, |
| 2014 | * or if ttstart/oproc is synchronous (or very fast). |
| 2015 | */ |
| 2016 | if (tp->t_outq.c_cc <= hiwat) { |
| 2017 | crit_exit(); |
| 2018 | goto loop; |
| 2019 | } |
| 2020 | if (flag & IO_NDELAY) { |
| 2021 | crit_exit(); |
| 2022 | uio->uio_resid += cc; |
| 2023 | return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); |
| 2024 | } |
| 2025 | SET(tp->t_state, TS_SO_OLOWAT); |
| 2026 | error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout); |
| 2027 | crit_exit(); |
| 2028 | if (error == EWOULDBLOCK) |
| 2029 | error = EIO; |
| 2030 | if (error) |
| 2031 | goto out; |
| 2032 | goto loop; |
| 2033 | } |
| 2034 | |
| 2035 | /* |
| 2036 | * Rubout one character from the rawq of tp |
| 2037 | * as cleanly as possible. |
| 2038 | */ |
| 2039 | static void |
| 2040 | ttyrub(int c, struct tty *tp) |
| 2041 | { |
| 2042 | char *cp; |
| 2043 | int savecol; |
| 2044 | int tabc; |
| 2045 | |
| 2046 | if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) |
| 2047 | return; |
| 2048 | CLR(tp->t_lflag, FLUSHO); |
| 2049 | if (ISSET(tp->t_lflag, ECHOE)) { |
| 2050 | if (tp->t_rocount == 0) { |
| 2051 | /* |
| 2052 | * Screwed by ttwrite; retype |
| 2053 | */ |
| 2054 | ttyretype(tp); |
| 2055 | return; |
| 2056 | } |
| 2057 | if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) |
| 2058 | ttyrubo(tp, 2); |
| 2059 | else { |
| 2060 | CLR(c, ~TTY_CHARMASK); |
| 2061 | switch (CCLASS(c)) { |
| 2062 | case ORDINARY: |
| 2063 | ttyrubo(tp, 1); |
| 2064 | break; |
| 2065 | case BACKSPACE: |
| 2066 | case CONTROL: |
| 2067 | case NEWLINE: |
| 2068 | case RETURN: |
| 2069 | case VTAB: |
| 2070 | if (ISSET(tp->t_lflag, ECHOCTL)) |
| 2071 | ttyrubo(tp, 2); |
| 2072 | break; |
| 2073 | case TAB: |
| 2074 | if (tp->t_rocount < tp->t_rawq.c_cc) { |
| 2075 | ttyretype(tp); |
| 2076 | return; |
| 2077 | } |
| 2078 | crit_enter(); |
| 2079 | savecol = tp->t_column; |
| 2080 | SET(tp->t_state, TS_CNTTB); |
| 2081 | SET(tp->t_lflag, FLUSHO); |
| 2082 | tp->t_column = tp->t_rocol; |
| 2083 | cp = tp->t_rawq.c_cf; |
| 2084 | if (cp) |
| 2085 | tabc = *cp; /* XXX FIX NEXTC */ |
| 2086 | for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) |
| 2087 | ttyecho(tabc, tp); |
| 2088 | CLR(tp->t_lflag, FLUSHO); |
| 2089 | CLR(tp->t_state, TS_CNTTB); |
| 2090 | crit_exit(); |
| 2091 | |
| 2092 | /* savecol will now be length of the tab. */ |
| 2093 | savecol -= tp->t_column; |
| 2094 | tp->t_column += savecol; |
| 2095 | if (savecol > 8) |
| 2096 | savecol = 8; /* overflow screw */ |
| 2097 | while (--savecol >= 0) |
| 2098 | (void)ttyoutput('\b', tp); |
| 2099 | break; |
| 2100 | default: /* XXX */ |
| 2101 | #define PANICSTR "ttyrub: would panic c = %d, val = %d\n" |
| 2102 | (void)kprintf(PANICSTR, c, CCLASS(c)); |
| 2103 | #ifdef notdef |
| 2104 | panic(PANICSTR, c, CCLASS(c)); |
| 2105 | #endif |
| 2106 | } |
| 2107 | } |
| 2108 | } else if (ISSET(tp->t_lflag, ECHOPRT)) { |
| 2109 | if (!ISSET(tp->t_state, TS_ERASE)) { |
| 2110 | SET(tp->t_state, TS_ERASE); |
| 2111 | (void)ttyoutput('\\', tp); |
| 2112 | } |
| 2113 | ttyecho(c, tp); |
| 2114 | } else { |
| 2115 | ttyecho(tp->t_cc[VERASE], tp); |
| 2116 | /* |
| 2117 | * This code may be executed not only when an ERASE key |
| 2118 | * is pressed, but also when ^U (KILL) or ^W (WERASE) are. |
| 2119 | * So, I didn't think it was worthwhile to pass the extra |
| 2120 | * information (which would need an extra parameter, |
| 2121 | * changing every call) needed to distinguish the ERASE2 |
| 2122 | * case from the ERASE. |
| 2123 | */ |
| 2124 | } |
| 2125 | --tp->t_rocount; |
| 2126 | } |
| 2127 | |
| 2128 | /* |
| 2129 | * Back over cnt characters, erasing them. |
| 2130 | */ |
| 2131 | static void |
| 2132 | ttyrubo(struct tty *tp, int cnt) |
| 2133 | { |
| 2134 | |
| 2135 | while (cnt-- > 0) { |
| 2136 | (void)ttyoutput('\b', tp); |
| 2137 | (void)ttyoutput(' ', tp); |
| 2138 | (void)ttyoutput('\b', tp); |
| 2139 | } |
| 2140 | } |
| 2141 | |
| 2142 | /* |
| 2143 | * ttyretype -- |
| 2144 | * Reprint the rawq line. Note, it is assumed that c_cc has already |
| 2145 | * been checked. |
| 2146 | */ |
| 2147 | static void |
| 2148 | ttyretype(struct tty *tp) |
| 2149 | { |
| 2150 | char *cp; |
| 2151 | int c; |
| 2152 | |
| 2153 | /* Echo the reprint character. */ |
| 2154 | if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) |
| 2155 | ttyecho(tp->t_cc[VREPRINT], tp); |
| 2156 | |
| 2157 | (void)ttyoutput('\n', tp); |
| 2158 | |
| 2159 | /* |
| 2160 | * XXX |
| 2161 | * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE |
| 2162 | * BIT OF FIRST CHAR. |
| 2163 | */ |
| 2164 | crit_enter(); |
| 2165 | for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); |
| 2166 | cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) |
| 2167 | ttyecho(c, tp); |
| 2168 | for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); |
| 2169 | cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) |
| 2170 | ttyecho(c, tp); |
| 2171 | CLR(tp->t_state, TS_ERASE); |
| 2172 | crit_exit(); |
| 2173 | |
| 2174 | tp->t_rocount = tp->t_rawq.c_cc; |
| 2175 | tp->t_rocol = 0; |
| 2176 | } |
| 2177 | |
| 2178 | /* |
| 2179 | * Echo a typed character to the terminal. |
| 2180 | */ |
| 2181 | static void |
| 2182 | ttyecho(int c, struct tty *tp) |
| 2183 | { |
| 2184 | |
| 2185 | if (!ISSET(tp->t_state, TS_CNTTB)) |
| 2186 | CLR(tp->t_lflag, FLUSHO); |
| 2187 | if ((!ISSET(tp->t_lflag, ECHO) && |
| 2188 | (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || |
| 2189 | ISSET(tp->t_lflag, EXTPROC)) |
| 2190 | return; |
| 2191 | if (ISSET(tp->t_lflag, ECHOCTL) && |
| 2192 | ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || |
| 2193 | ISSET(c, TTY_CHARMASK) == 0177)) { |
| 2194 | (void)ttyoutput('^', tp); |
| 2195 | CLR(c, ~TTY_CHARMASK); |
| 2196 | if (c == 0177) |
| 2197 | c = '?'; |
| 2198 | else |
| 2199 | c += 'A' - 1; |
| 2200 | } |
| 2201 | (void)ttyoutput(c, tp); |
| 2202 | } |
| 2203 | |
| 2204 | /* |
| 2205 | * Wake up any readers on a tty. |
| 2206 | */ |
| 2207 | void |
| 2208 | ttwakeup(struct tty *tp) |
| 2209 | { |
| 2210 | |
| 2211 | if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) |
| 2212 | pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); |
| 2213 | wakeup(TSA_HUP_OR_INPUT(tp)); |
| 2214 | KNOTE(&tp->t_rkq.ki_note, 0); |
| 2215 | } |
| 2216 | |
| 2217 | /* |
| 2218 | * Wake up any writers on a tty. |
| 2219 | */ |
| 2220 | void |
| 2221 | ttwwakeup(struct tty *tp) |
| 2222 | { |
| 2223 | |
| 2224 | if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) |
| 2225 | pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); |
| 2226 | if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == |
| 2227 | TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { |
| 2228 | CLR(tp->t_state, TS_SO_OCOMPLETE); |
| 2229 | wakeup(TSA_OCOMPLETE(tp)); |
| 2230 | } |
| 2231 | if (ISSET(tp->t_state, TS_SO_OLOWAT) && |
| 2232 | tp->t_outq.c_cc <= tp->t_olowat) { |
| 2233 | CLR(tp->t_state, TS_SO_OLOWAT); |
| 2234 | wakeup(TSA_OLOWAT(tp)); |
| 2235 | } |
| 2236 | KNOTE(&tp->t_wkq.ki_note, 0); |
| 2237 | } |
| 2238 | |
| 2239 | /* |
| 2240 | * Look up a code for a specified speed in a conversion table; |
| 2241 | * used by drivers to map software speed values to hardware parameters. |
| 2242 | */ |
| 2243 | int |
| 2244 | ttspeedtab(int speed, struct speedtab *table) |
| 2245 | { |
| 2246 | |
| 2247 | for ( ; table->sp_speed != -1; table++) |
| 2248 | if (table->sp_speed == speed) |
| 2249 | return (table->sp_code); |
| 2250 | return (-1); |
| 2251 | } |
| 2252 | |
| 2253 | /* |
| 2254 | * Set input and output watermarks and buffer sizes. For input, the |
| 2255 | * high watermark is about one second's worth of input above empty, the |
| 2256 | * low watermark is slightly below high water, and the buffer size is a |
| 2257 | * driver-dependent amount above high water. For output, the watermarks |
| 2258 | * are near the ends of the buffer, with about 1 second's worth of input |
| 2259 | * between them. All this only applies to the standard line discipline. |
| 2260 | */ |
| 2261 | void |
| 2262 | ttsetwater(struct tty *tp) |
| 2263 | { |
| 2264 | int cps, ttmaxhiwat, x; |
| 2265 | |
| 2266 | /* Input. */ |
| 2267 | clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); |
| 2268 | switch (tp->t_ispeedwat) { |
| 2269 | case (speed_t)-1: |
| 2270 | cps = tp->t_ispeed / 10; |
| 2271 | break; |
| 2272 | case 0: |
| 2273 | /* |
| 2274 | * This case is for old drivers that don't know about |
| 2275 | * t_ispeedwat. Arrange for them to get the old buffer |
| 2276 | * sizes and watermarks. |
| 2277 | */ |
| 2278 | cps = TTYHOG - 2 * 256; |
| 2279 | tp->t_ififosize = 2 * 2048; |
| 2280 | break; |
| 2281 | default: |
| 2282 | cps = tp->t_ispeedwat / 10; |
| 2283 | break; |
| 2284 | } |
| 2285 | tp->t_ihiwat = cps; |
| 2286 | tp->t_ilowat = 7 * cps / 8; |
| 2287 | x = cps + tp->t_ififosize; |
| 2288 | clist_alloc_cblocks(&tp->t_rawq, x, x); |
| 2289 | |
| 2290 | /* Output. */ |
| 2291 | switch (tp->t_ospeedwat) { |
| 2292 | case (speed_t)-1: |
| 2293 | cps = tp->t_ospeed / 10; |
| 2294 | ttmaxhiwat = 2 * TTMAXHIWAT; |
| 2295 | break; |
| 2296 | case 0: |
| 2297 | cps = tp->t_ospeed / 10; |
| 2298 | ttmaxhiwat = TTMAXHIWAT; |
| 2299 | break; |
| 2300 | default: |
| 2301 | cps = tp->t_ospeedwat / 10; |
| 2302 | ttmaxhiwat = 8 * TTMAXHIWAT; |
| 2303 | break; |
| 2304 | } |
| 2305 | #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) |
| 2306 | tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); |
| 2307 | x += cps; |
| 2308 | x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */ |
| 2309 | tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */ |
| 2310 | x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */ |
| 2311 | x += OBUFSIZ + 100; |
| 2312 | clist_alloc_cblocks(&tp->t_outq, x, x); |
| 2313 | #undef CLAMP |
| 2314 | } |
| 2315 | |
| 2316 | /* |
| 2317 | * Report on state of foreground process group. |
| 2318 | */ |
| 2319 | void |
| 2320 | ttyinfo(struct tty *tp) |
| 2321 | { |
| 2322 | struct proc *p, *pick; |
| 2323 | struct lwp *lp; |
| 2324 | struct rusage ru; |
| 2325 | int tmp; |
| 2326 | |
| 2327 | if (ttycheckoutq(tp,0) == 0) |
| 2328 | return; |
| 2329 | |
| 2330 | /* |
| 2331 | * We always print the load average, then figure out what else to |
| 2332 | * print based on the state of the current process group. |
| 2333 | */ |
| 2334 | tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; |
| 2335 | ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100); |
| 2336 | |
| 2337 | if (tp->t_session == NULL) { |
| 2338 | ttyprintf(tp, "not a controlling terminal\n"); |
| 2339 | } else if (tp->t_pgrp == NULL) { |
| 2340 | ttyprintf(tp, "no foreground process group\n"); |
| 2341 | } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) { |
| 2342 | ttyprintf(tp, "empty foreground process group\n"); |
| 2343 | } else { |
| 2344 | /* |
| 2345 | * Pick an interesting process. Note that certain elements, |
| 2346 | * in particular the wmesg, require a critical section for |
| 2347 | * safe access (YYY and we are still not MP safe). |
| 2348 | * |
| 2349 | * NOTE: lwp_wmesg is lwp_thread->td_wmesg. |
| 2350 | */ |
| 2351 | char buf[64]; |
| 2352 | const char *str; |
| 2353 | long vmsz; |
| 2354 | int pctcpu; |
| 2355 | |
| 2356 | crit_enter(); |
| 2357 | |
| 2358 | /* XXX lwp should compare lwps */ |
| 2359 | |
| 2360 | for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) { |
| 2361 | if (proc_compare(pick, p)) |
| 2362 | pick = p; |
| 2363 | } |
| 2364 | |
| 2365 | /* XXX lwp */ |
| 2366 | lp = FIRST_LWP_IN_PROC(pick); |
| 2367 | if (lp == NULL) { |
| 2368 | ttyprintf(tp, "foreground process without lwp\n"); |
| 2369 | tp->t_rocount = 0; |
| 2370 | crit_exit(); |
| 2371 | return; |
| 2372 | } |
| 2373 | |
| 2374 | /* |
| 2375 | * Figure out what wait/process-state message, and command |
| 2376 | * buffer to present |
| 2377 | */ |
| 2378 | /* |
| 2379 | * XXX lwp This is a horrible mixture. We need to rework this |
| 2380 | * as soon as lwps have their own runnable status. |
| 2381 | */ |
| 2382 | if (pick->p_flag & P_WEXIT) |
| 2383 | str = "exiting"; |
| 2384 | else if (lp->lwp_stat == LSRUN) |
| 2385 | str = "running"; |
| 2386 | else if (pick->p_stat == SIDL) |
| 2387 | str = "spawning"; |
| 2388 | else if (lp->lwp_wmesg) /* lwp_thread must not be NULL */ |
| 2389 | str = lp->lwp_wmesg; |
| 2390 | else |
| 2391 | str = "iowait"; |
| 2392 | |
| 2393 | ksnprintf(buf, sizeof(buf), "cmd: %s %d [%s]", |
| 2394 | pick->p_comm, pick->p_pid, str); |
| 2395 | |
| 2396 | /* |
| 2397 | * Calculate cpu usage, percent cpu, and cmsz. Note that |
| 2398 | * 'pick' becomes invalid the moment we exit the critical |
| 2399 | * section. |
| 2400 | */ |
| 2401 | if (lp->lwp_thread && (pick->p_flag & P_SWAPPEDOUT) == 0) |
| 2402 | calcru_proc(pick, &ru); |
| 2403 | |
| 2404 | pctcpu = (lp->lwp_pctcpu * 10000 + FSCALE / 2) >> FSHIFT; |
| 2405 | |
| 2406 | if (pick->p_stat == SIDL || pick->p_stat == SZOMB) |
| 2407 | vmsz = 0; |
| 2408 | else |
| 2409 | vmsz = pgtok(vmspace_resident_count(pick->p_vmspace)); |
| 2410 | |
| 2411 | crit_exit(); |
| 2412 | |
| 2413 | /* |
| 2414 | * Dump the output |
| 2415 | */ |
| 2416 | ttyprintf(tp, " %s ", buf); |
| 2417 | ttyprintf(tp, "%ld.%02ldu ", |
| 2418 | ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000); |
| 2419 | ttyprintf(tp, "%ld.%02lds ", |
| 2420 | ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000); |
| 2421 | ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz); |
| 2422 | } |
| 2423 | tp->t_rocount = 0; /* so pending input will be retyped if BS */ |
| 2424 | } |
| 2425 | |
| 2426 | /* |
| 2427 | * Returns 1 if p2 is "better" than p1 |
| 2428 | * |
| 2429 | * The algorithm for picking the "interesting" process is thus: |
| 2430 | * |
| 2431 | * 1) Only foreground processes are eligible - implied. |
| 2432 | * 2) Runnable processes are favored over anything else. The runner |
| 2433 | * with the highest cpu utilization is picked (p_cpticks). Ties are |
| 2434 | * broken by picking the highest pid. |
| 2435 | * 3) The sleeper with the shortest sleep time is next. With ties, |
| 2436 | * we pick out just "short-term" sleepers (LWP_SINTR == 0). |
| 2437 | * 4) Further ties are broken by picking the highest pid. |
| 2438 | */ |
| 2439 | #define ISRUN(lp) ((lp)->lwp_stat == LSRUN) |
| 2440 | #define TESTAB(a, b) ((a)<<1 | (b)) |
| 2441 | #define ONLYA 2 |
| 2442 | #define ONLYB 1 |
| 2443 | #define BOTH 3 |
| 2444 | |
| 2445 | static int |
| 2446 | proc_compare(struct proc *p1, struct proc *p2) |
| 2447 | { |
| 2448 | struct lwp *lp1, *lp2; |
| 2449 | if (p1 == NULL) |
| 2450 | return (1); |
| 2451 | |
| 2452 | /* |
| 2453 | * weed out zombies |
| 2454 | */ |
| 2455 | switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) { |
| 2456 | case ONLYA: |
| 2457 | return (1); |
| 2458 | case ONLYB: |
| 2459 | return (0); |
| 2460 | case BOTH: |
| 2461 | return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ |
| 2462 | } |
| 2463 | |
| 2464 | /* XXX lwp */ |
| 2465 | lp1 = FIRST_LWP_IN_PROC(p1); |
| 2466 | lp2 = FIRST_LWP_IN_PROC(p2); |
| 2467 | |
| 2468 | /* |
| 2469 | * see if at least one of them is runnable |
| 2470 | */ |
| 2471 | switch (TESTAB(ISRUN(lp1), ISRUN(lp2))) { |
| 2472 | case ONLYA: |
| 2473 | return (0); |
| 2474 | case ONLYB: |
| 2475 | return (1); |
| 2476 | case BOTH: |
| 2477 | /* |
| 2478 | * tie - favor one with highest recent cpu utilization |
| 2479 | */ |
| 2480 | if (lp2->lwp_cpticks > lp1->lwp_cpticks) |
| 2481 | return (1); |
| 2482 | if (lp1->lwp_cpticks > lp2->lwp_cpticks) |
| 2483 | return (0); |
| 2484 | return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ |
| 2485 | } |
| 2486 | /* |
| 2487 | * pick the one with the smallest sleep time |
| 2488 | */ |
| 2489 | if (lp2->lwp_slptime > lp1->lwp_slptime) |
| 2490 | return (0); |
| 2491 | if (lp1->lwp_slptime > lp2->lwp_slptime) |
| 2492 | return (1); |
| 2493 | /* |
| 2494 | * favor one sleeping in a non-interruptible sleep |
| 2495 | */ |
| 2496 | if (lp1->lwp_flag & LWP_SINTR && (lp2->lwp_flag & LWP_SINTR) == 0) |
| 2497 | return (1); |
| 2498 | if (lp2->lwp_flag & LWP_SINTR && (lp1->lwp_flag & LWP_SINTR) == 0) |
| 2499 | return (0); |
| 2500 | return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ |
| 2501 | } |
| 2502 | |
| 2503 | /* |
| 2504 | * Output char to tty; console putchar style. |
| 2505 | */ |
| 2506 | int |
| 2507 | tputchar(int c, struct tty *tp) |
| 2508 | { |
| 2509 | crit_enter(); |
| 2510 | if (!ISSET(tp->t_state, TS_CONNECTED)) { |
| 2511 | crit_exit(); |
| 2512 | return (-1); |
| 2513 | } |
| 2514 | if (c == '\n') |
| 2515 | (void)ttyoutput('\r', tp); |
| 2516 | (void)ttyoutput(c, tp); |
| 2517 | ttstart(tp); |
| 2518 | crit_exit(); |
| 2519 | return (0); |
| 2520 | } |
| 2521 | |
| 2522 | /* |
| 2523 | * Sleep on chan, returning ERESTART if tty changed while we napped and |
| 2524 | * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If |
| 2525 | * the tty is revoked, restarting a pending call will redo validation done |
| 2526 | * at the start of the call. |
| 2527 | */ |
| 2528 | int |
| 2529 | ttysleep(struct tty *tp, void *chan, int slpflags, char *wmesg, int timo) |
| 2530 | { |
| 2531 | int error; |
| 2532 | int gen; |
| 2533 | |
| 2534 | gen = tp->t_gen; |
| 2535 | error = tsleep(chan, slpflags, wmesg, timo); |
| 2536 | if (error) |
| 2537 | return (error); |
| 2538 | return (tp->t_gen == gen ? 0 : ERESTART); |
| 2539 | } |
| 2540 | |
| 2541 | /* |
| 2542 | * Revoke a tty. |
| 2543 | * |
| 2544 | * We bump the gen to force any ttysleep()'s to return with ERESTART |
| 2545 | * and flush the tty. The related fp's should already have been |
| 2546 | * replaced so the tty will close when the last references on the |
| 2547 | * original fp's go away. |
| 2548 | */ |
| 2549 | int |
| 2550 | ttyrevoke(struct dev_revoke_args *ap) |
| 2551 | { |
| 2552 | struct tty *tp; |
| 2553 | |
| 2554 | tp = ap->a_head.a_dev->si_tty; |
| 2555 | tp->t_gen++; |
| 2556 | ttyflush(tp, FREAD | FWRITE); |
| 2557 | wakeup(TSA_CARR_ON(tp)); |
| 2558 | ttwakeup(tp); |
| 2559 | ttwwakeup(tp); |
| 2560 | return (0); |
| 2561 | } |
| 2562 | |
| 2563 | /* |
| 2564 | * Allocate a tty struct. Clists in the struct will be allocated by |
| 2565 | * ttyopen(). |
| 2566 | */ |
| 2567 | struct tty * |
| 2568 | ttymalloc(struct tty *tp) |
| 2569 | { |
| 2570 | |
| 2571 | if (tp) { |
| 2572 | return(tp); |
| 2573 | } |
| 2574 | tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO); |
| 2575 | ttyregister(tp); |
| 2576 | return (tp); |
| 2577 | } |
| 2578 | |
| 2579 | void |
| 2580 | ttyunregister(struct tty *tp) |
| 2581 | { |
| 2582 | KKASSERT(ISSET(tp->t_state, TS_REGISTERED)); |
| 2583 | CLR(tp->t_state, TS_REGISTERED); |
| 2584 | TAILQ_REMOVE(&tty_list, tp, t_list); |
| 2585 | } |
| 2586 | |
| 2587 | void |
| 2588 | ttyregister(struct tty *tp) |
| 2589 | { |
| 2590 | KKASSERT(!ISSET(tp->t_state, TS_REGISTERED)); |
| 2591 | SET(tp->t_state, TS_REGISTERED); |
| 2592 | TAILQ_INSERT_HEAD(&tty_list, tp, t_list); |
| 2593 | } |
| 2594 | |
| 2595 | static int |
| 2596 | sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) |
| 2597 | { |
| 2598 | int error; |
| 2599 | struct tty *tp; |
| 2600 | struct tty t; |
| 2601 | struct tty marker; |
| 2602 | |
| 2603 | bzero(&marker, sizeof(marker)); |
| 2604 | marker.t_state = TS_MARKER; |
| 2605 | error = 0; |
| 2606 | |
| 2607 | TAILQ_INSERT_HEAD(&tty_list, &marker, t_list); |
| 2608 | while ((tp = TAILQ_NEXT(&marker, t_list)) != NULL) { |
| 2609 | TAILQ_REMOVE(&tty_list, &marker, t_list); |
| 2610 | TAILQ_INSERT_AFTER(&tty_list, tp, &marker, t_list); |
| 2611 | if (tp->t_state & TS_MARKER) |
| 2612 | continue; |
| 2613 | t = *tp; |
| 2614 | if (t.t_dev) |
| 2615 | t.t_dev = (cdev_t)(uintptr_t)dev2udev(t.t_dev); |
| 2616 | error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t)); |
| 2617 | if (error) |
| 2618 | break; |
| 2619 | } |
| 2620 | TAILQ_REMOVE(&tty_list, &marker, t_list); |
| 2621 | return (error); |
| 2622 | } |
| 2623 | |
| 2624 | SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD, |
| 2625 | 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys"); |
| 2626 | |
| 2627 | void |
| 2628 | nottystop(struct tty *tp, int rw) |
| 2629 | { |
| 2630 | |
| 2631 | return; |
| 2632 | } |
| 2633 | |
| 2634 | int |
| 2635 | ttyread(struct dev_read_args *ap) |
| 2636 | { |
| 2637 | struct tty *tp; |
| 2638 | |
| 2639 | tp = ap->a_head.a_dev->si_tty; |
| 2640 | if (tp == NULL) |
| 2641 | return (ENODEV); |
| 2642 | return ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag)); |
| 2643 | } |
| 2644 | |
| 2645 | int |
| 2646 | ttywrite(struct dev_write_args *ap) |
| 2647 | { |
| 2648 | struct tty *tp; |
| 2649 | |
| 2650 | tp = ap->a_head.a_dev->si_tty; |
| 2651 | if (tp == NULL) |
| 2652 | return (ENODEV); |
| 2653 | return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag)); |
| 2654 | } |