| 1 | /* $NetBSD: tty.c,v 1.274 2016/10/01 04:42:54 christos Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2008 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 17 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 18 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 19 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 20 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 26 | * POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | /*- |
| 30 | * Copyright (c) 1982, 1986, 1990, 1991, 1993 |
| 31 | * The Regents of the University of California. All rights reserved. |
| 32 | * (c) UNIX System Laboratories, Inc. |
| 33 | * All or some portions of this file are derived from material licensed |
| 34 | * to the University of California by American Telephone and Telegraph |
| 35 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 36 | * the permission of UNIX System Laboratories, Inc. |
| 37 | * |
| 38 | * Redistribution and use in source and binary forms, with or without |
| 39 | * modification, are permitted provided that the following conditions |
| 40 | * are met: |
| 41 | * 1. Redistributions of source code must retain the above copyright |
| 42 | * notice, this list of conditions and the following disclaimer. |
| 43 | * 2. Redistributions in binary form must reproduce the above copyright |
| 44 | * notice, this list of conditions and the following disclaimer in the |
| 45 | * documentation and/or other materials provided with the distribution. |
| 46 | * 3. Neither the name of the University nor the names of its contributors |
| 47 | * may be used to endorse or promote products derived from this software |
| 48 | * without specific prior written permission. |
| 49 | * |
| 50 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 51 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 52 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 53 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 54 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 55 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 56 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 57 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 58 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 59 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 60 | * SUCH DAMAGE. |
| 61 | * |
| 62 | * @(#)tty.c 8.13 (Berkeley) 1/9/95 |
| 63 | */ |
| 64 | |
| 65 | #include <sys/cdefs.h> |
| 66 | __KERNEL_RCSID(0, "$NetBSD: tty.c,v 1.274 2016/10/01 04:42:54 christos Exp $" ); |
| 67 | |
| 68 | #ifdef _KERNEL_OPT |
| 69 | #include "opt_compat_netbsd.h" |
| 70 | #endif |
| 71 | |
| 72 | #define TTY_ALLOW_PRIVATE |
| 73 | |
| 74 | #include <sys/param.h> |
| 75 | #include <sys/systm.h> |
| 76 | #include <sys/ioctl.h> |
| 77 | #include <sys/proc.h> |
| 78 | #define TTYDEFCHARS |
| 79 | #include <sys/tty.h> |
| 80 | #undef TTYDEFCHARS |
| 81 | #include <sys/file.h> |
| 82 | #include <sys/conf.h> |
| 83 | #include <sys/cpu.h> |
| 84 | #include <sys/dkstat.h> |
| 85 | #include <sys/uio.h> |
| 86 | #include <sys/kernel.h> |
| 87 | #include <sys/vnode.h> |
| 88 | #include <sys/syslog.h> |
| 89 | #include <sys/kmem.h> |
| 90 | #include <sys/signalvar.h> |
| 91 | #include <sys/resourcevar.h> |
| 92 | #include <sys/poll.h> |
| 93 | #include <sys/kprintf.h> |
| 94 | #include <sys/namei.h> |
| 95 | #include <sys/sysctl.h> |
| 96 | #include <sys/kauth.h> |
| 97 | #include <sys/intr.h> |
| 98 | #include <sys/ioctl_compat.h> |
| 99 | #include <sys/module.h> |
| 100 | #include <sys/bitops.h> |
| 101 | |
| 102 | #ifdef COMPAT_60 |
| 103 | #include <compat/sys/ttycom.h> |
| 104 | #endif /* COMPAT_60 */ |
| 105 | |
| 106 | static int ttnread(struct tty *); |
| 107 | static void ttyblock(struct tty *); |
| 108 | static void ttyecho(int, struct tty *); |
| 109 | static void ttyrubo(struct tty *, int); |
| 110 | static void ttyprintf_nolock(struct tty *, const char *fmt, ...) |
| 111 | __printflike(2, 3); |
| 112 | static int proc_compare_wrapper(struct proc *, struct proc *); |
| 113 | static void ttysigintr(void *); |
| 114 | |
| 115 | /* Symbolic sleep message strings. */ |
| 116 | const char ttclos[] = "ttycls" ; |
| 117 | const char ttopen[] = "ttyopn" ; |
| 118 | const char ttybg[] = "ttybg" ; |
| 119 | const char ttyin[] = "ttyin" ; |
| 120 | const char ttyout[] = "ttyout" ; |
| 121 | |
| 122 | /* |
| 123 | * Used to determine whether we still have a connection. This is true in |
| 124 | * one of 3 cases: |
| 125 | * 1) We have carrier. |
| 126 | * 2) It's a locally attached terminal, and we are therefore ignoring carrier. |
| 127 | * 3) We're using a flow control mechanism that overloads the carrier signal. |
| 128 | */ |
| 129 | #define CONNECTED(tp) (ISSET(tp->t_state, TS_CARR_ON) || \ |
| 130 | ISSET(tp->t_cflag, CLOCAL | MDMBUF)) |
| 131 | |
| 132 | /* |
| 133 | * Table with character classes and parity. The 8th bit indicates parity, |
| 134 | * the 7th bit indicates the character is an alphameric or underscore (for |
| 135 | * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits |
| 136 | * are 0 then the character needs no special processing on output; classes |
| 137 | * other than 0 might be translated or (not currently) require delays. |
| 138 | */ |
| 139 | #define E 0x00 /* Even parity. */ |
| 140 | #define O 0x80 /* Odd parity. */ |
| 141 | #define PARITY(c) (char_type[c] & O) |
| 142 | |
| 143 | #define ALPHA 0x40 /* Alpha or underscore. */ |
| 144 | #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) |
| 145 | |
| 146 | #define CCLASSMASK 0x3f |
| 147 | #define CCLASS(c) (char_type[c] & CCLASSMASK) |
| 148 | |
| 149 | #define BS BACKSPACE |
| 150 | #define CC CONTROL |
| 151 | #define CR RETURN |
| 152 | #define NA ORDINARY | ALPHA |
| 153 | #define NL NEWLINE |
| 154 | #define NO ORDINARY |
| 155 | #define TB TAB |
| 156 | #define VT VTAB |
| 157 | |
| 158 | unsigned char const char_type[] = { |
| 159 | E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ |
| 160 | O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ |
| 161 | O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ |
| 162 | E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ |
| 163 | O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ |
| 164 | E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ |
| 165 | E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ |
| 166 | O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ |
| 167 | O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ |
| 168 | E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ |
| 169 | E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ |
| 170 | O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ |
| 171 | E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ |
| 172 | O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ |
| 173 | O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ |
| 174 | E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ |
| 175 | /* |
| 176 | * Meta chars; should be settable per character set; |
| 177 | * for now, treat them all as normal characters. |
| 178 | */ |
| 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 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 185 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 186 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 187 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 188 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 189 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 190 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 191 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 192 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 193 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 194 | NA, NA, NA, NA, NA, NA, NA, NA, |
| 195 | }; |
| 196 | #undef BS |
| 197 | #undef CC |
| 198 | #undef CR |
| 199 | #undef NA |
| 200 | #undef NL |
| 201 | #undef NO |
| 202 | #undef TB |
| 203 | #undef VT |
| 204 | |
| 205 | static struct ttylist_head tty_sigqueue = TAILQ_HEAD_INITIALIZER(tty_sigqueue); |
| 206 | static void *tty_sigsih; |
| 207 | |
| 208 | struct ttylist_head ttylist = TAILQ_HEAD_INITIALIZER(ttylist); |
| 209 | int tty_count; |
| 210 | kmutex_t tty_lock; |
| 211 | krwlock_t ttcompat_lock; |
| 212 | int (*ttcompatvec)(struct tty *, u_long, void *, int, struct lwp *); |
| 213 | |
| 214 | uint64_t tk_cancc; |
| 215 | uint64_t tk_nin; |
| 216 | uint64_t tk_nout; |
| 217 | uint64_t tk_rawcc; |
| 218 | |
| 219 | static kauth_listener_t tty_listener; |
| 220 | |
| 221 | #define TTY_MINQSIZE 0x00400 |
| 222 | #define TTY_MAXQSIZE 0x10000 |
| 223 | int tty_qsize = TTY_MINQSIZE; |
| 224 | |
| 225 | static int |
| 226 | tty_get_qsize(int *qsize, int newsize) |
| 227 | { |
| 228 | newsize = 1 << ilog2(newsize); /* Make it a power of two */ |
| 229 | |
| 230 | if (newsize < TTY_MINQSIZE || newsize > TTY_MAXQSIZE) |
| 231 | return EINVAL; |
| 232 | |
| 233 | *qsize = newsize; |
| 234 | return 0; |
| 235 | } |
| 236 | |
| 237 | static int |
| 238 | tty_set_qsize(struct tty *tp, int newsize) |
| 239 | { |
| 240 | struct clist rawq, canq, outq; |
| 241 | struct clist orawq, ocanq, ooutq; |
| 242 | |
| 243 | clalloc(&rawq, newsize, 1); |
| 244 | clalloc(&canq, newsize, 1); |
| 245 | clalloc(&outq, newsize, 0); |
| 246 | |
| 247 | mutex_spin_enter(&tty_lock); |
| 248 | |
| 249 | if (tp->t_outq.c_cc != 0) { |
| 250 | mutex_spin_exit(&tty_lock); |
| 251 | clfree(&rawq); |
| 252 | clfree(&canq); |
| 253 | clfree(&outq); |
| 254 | return EBUSY; |
| 255 | } |
| 256 | |
| 257 | orawq = tp->t_rawq; |
| 258 | ocanq = tp->t_canq; |
| 259 | ooutq = tp->t_outq; |
| 260 | |
| 261 | tp->t_qsize = newsize; |
| 262 | tp->t_rawq = rawq; |
| 263 | tp->t_canq = canq; |
| 264 | tp->t_outq = outq; |
| 265 | |
| 266 | ttsetwater(tp); |
| 267 | |
| 268 | mutex_spin_exit(&tty_lock); |
| 269 | |
| 270 | clfree(&orawq); |
| 271 | clfree(&ocanq); |
| 272 | clfree(&ooutq); |
| 273 | |
| 274 | return 0; |
| 275 | } |
| 276 | |
| 277 | static int |
| 278 | sysctl_kern_tty_qsize(SYSCTLFN_ARGS) |
| 279 | { |
| 280 | int newsize; |
| 281 | int error; |
| 282 | struct sysctlnode node; |
| 283 | node = *rnode; |
| 284 | node.sysctl_data = &newsize; |
| 285 | |
| 286 | newsize = tty_qsize; |
| 287 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
| 288 | if (error || newp == NULL) |
| 289 | return error; |
| 290 | |
| 291 | |
| 292 | return tty_get_qsize(&tty_qsize, newsize); |
| 293 | } |
| 294 | |
| 295 | static void |
| 296 | sysctl_kern_tty_setup(void) |
| 297 | { |
| 298 | const struct sysctlnode *rnode, *cnode; |
| 299 | struct sysctllog *kern_tkstat_sysctllog, *kern_tty_sysctllog; |
| 300 | |
| 301 | kern_tkstat_sysctllog = NULL; |
| 302 | sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, |
| 303 | CTLFLAG_PERMANENT, |
| 304 | CTLTYPE_NODE, "tkstat" , |
| 305 | SYSCTL_DESCR("Number of characters sent and and " |
| 306 | "received on ttys" ), |
| 307 | NULL, 0, NULL, 0, |
| 308 | CTL_KERN, KERN_TKSTAT, CTL_EOL); |
| 309 | |
| 310 | sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, |
| 311 | CTLFLAG_PERMANENT, |
| 312 | CTLTYPE_QUAD, "nin" , |
| 313 | SYSCTL_DESCR("Total number of tty input characters" ), |
| 314 | NULL, 0, &tk_nin, 0, |
| 315 | CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_NIN, CTL_EOL); |
| 316 | sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, |
| 317 | CTLFLAG_PERMANENT, |
| 318 | CTLTYPE_QUAD, "nout" , |
| 319 | SYSCTL_DESCR("Total number of tty output characters" ), |
| 320 | NULL, 0, &tk_nout, 0, |
| 321 | CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_NOUT, CTL_EOL); |
| 322 | sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, |
| 323 | CTLFLAG_PERMANENT, |
| 324 | CTLTYPE_QUAD, "cancc" , |
| 325 | SYSCTL_DESCR("Number of canonical tty input characters" ), |
| 326 | NULL, 0, &tk_cancc, 0, |
| 327 | CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_CANCC, CTL_EOL); |
| 328 | sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, |
| 329 | CTLFLAG_PERMANENT, |
| 330 | CTLTYPE_QUAD, "rawcc" , |
| 331 | SYSCTL_DESCR("Number of raw tty input characters" ), |
| 332 | NULL, 0, &tk_rawcc, 0, |
| 333 | CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_RAWCC, CTL_EOL); |
| 334 | |
| 335 | kern_tty_sysctllog = NULL; |
| 336 | sysctl_createv(&kern_tty_sysctllog, 0, NULL, &rnode, |
| 337 | CTLFLAG_PERMANENT, |
| 338 | CTLTYPE_NODE, "tty" , NULL, |
| 339 | NULL, 0, NULL, 0, |
| 340 | CTL_KERN, CTL_CREATE, CTL_EOL); |
| 341 | sysctl_createv(&kern_tty_sysctllog, 0, &rnode, &cnode, |
| 342 | CTLFLAG_PERMANENT | CTLFLAG_READWRITE, |
| 343 | CTLTYPE_INT, "qsize" , |
| 344 | SYSCTL_DESCR("TTY input and output queue size" ), |
| 345 | sysctl_kern_tty_qsize, 0, &tty_qsize, 0, |
| 346 | CTL_CREATE, CTL_EOL); |
| 347 | } |
| 348 | |
| 349 | int |
| 350 | ttyopen(struct tty *tp, int dialout, int nonblock) |
| 351 | { |
| 352 | int error; |
| 353 | |
| 354 | error = 0; |
| 355 | |
| 356 | mutex_spin_enter(&tty_lock); |
| 357 | |
| 358 | if (dialout) { |
| 359 | /* |
| 360 | * If the device is already open for non-dialout, fail. |
| 361 | * Otherwise, set TS_DIALOUT to block any pending non-dialout |
| 362 | * opens. |
| 363 | */ |
| 364 | if (ISSET(tp->t_state, TS_ISOPEN) && |
| 365 | !ISSET(tp->t_state, TS_DIALOUT)) { |
| 366 | error = EBUSY; |
| 367 | goto out; |
| 368 | } |
| 369 | SET(tp->t_state, TS_DIALOUT); |
| 370 | } else { |
| 371 | if (!nonblock) { |
| 372 | /* |
| 373 | * Wait for carrier. Also wait for any dialout |
| 374 | * processes to close the tty first. |
| 375 | */ |
| 376 | while (ISSET(tp->t_state, TS_DIALOUT) || |
| 377 | !CONNECTED(tp)) { |
| 378 | tp->t_wopen++; |
| 379 | error = ttysleep(tp, &tp->t_rawcv, true, 0); |
| 380 | tp->t_wopen--; |
| 381 | if (error) |
| 382 | goto out; |
| 383 | } |
| 384 | } else { |
| 385 | /* |
| 386 | * Don't allow a non-blocking non-dialout open if the |
| 387 | * device is already open for dialout. |
| 388 | */ |
| 389 | if (ISSET(tp->t_state, TS_DIALOUT)) { |
| 390 | error = EBUSY; |
| 391 | goto out; |
| 392 | } |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | out: |
| 397 | mutex_spin_exit(&tty_lock); |
| 398 | return (error); |
| 399 | } |
| 400 | |
| 401 | /* |
| 402 | * Initial open of tty, or (re)entry to standard tty line discipline. |
| 403 | */ |
| 404 | int |
| 405 | ttylopen(dev_t device, struct tty *tp) |
| 406 | { |
| 407 | |
| 408 | mutex_spin_enter(&tty_lock); |
| 409 | tp->t_dev = device; |
| 410 | if (!ISSET(tp->t_state, TS_ISOPEN)) { |
| 411 | SET(tp->t_state, TS_ISOPEN); |
| 412 | memset(&tp->t_winsize, 0, sizeof(tp->t_winsize)); |
| 413 | tp->t_flags = 0; |
| 414 | } |
| 415 | mutex_spin_exit(&tty_lock); |
| 416 | if (tp->t_qsize != tty_qsize) |
| 417 | tty_set_qsize(tp, tty_qsize); |
| 418 | return (0); |
| 419 | } |
| 420 | |
| 421 | /* |
| 422 | * Handle close() on a tty line: flush and set to initial state, |
| 423 | * bumping generation number so that pending read/write calls |
| 424 | * can detect recycling of the tty. |
| 425 | */ |
| 426 | int |
| 427 | ttyclose(struct tty *tp) |
| 428 | { |
| 429 | extern struct tty *constty; /* Temporary virtual console. */ |
| 430 | struct session *sess; |
| 431 | |
| 432 | mutex_spin_enter(&tty_lock); |
| 433 | |
| 434 | if (constty == tp) |
| 435 | constty = NULL; |
| 436 | |
| 437 | ttyflush(tp, FREAD | FWRITE); |
| 438 | |
| 439 | tp->t_gen++; |
| 440 | tp->t_pgrp = NULL; |
| 441 | tp->t_state = 0; |
| 442 | sess = tp->t_session; |
| 443 | tp->t_session = NULL; |
| 444 | |
| 445 | mutex_spin_exit(&tty_lock); |
| 446 | |
| 447 | if (sess != NULL) { |
| 448 | mutex_enter(proc_lock); |
| 449 | /* Releases proc_lock. */ |
| 450 | proc_sessrele(sess); |
| 451 | } |
| 452 | return (0); |
| 453 | } |
| 454 | |
| 455 | #define FLUSHQ(q) { \ |
| 456 | if ((q)->c_cc) \ |
| 457 | ndflush(q, (q)->c_cc); \ |
| 458 | } |
| 459 | |
| 460 | /* |
| 461 | * This macro is used in canonical mode input processing, where a read |
| 462 | * request shall not return unless a 'line delimiter' ('\n') or 'break' |
| 463 | * (EOF, EOL, EOL2) character (or a signal) has been received. As EOL2 |
| 464 | * is an extension to the POSIX.1 defined set of special characters, |
| 465 | * recognize it only if IEXTEN is set in the set of local flags. |
| 466 | */ |
| 467 | #define TTBREAKC(c, lflg) \ |
| 468 | ((c) == '\n' || (((c) == cc[VEOF] || (c) == cc[VEOL] || \ |
| 469 | ((c) == cc[VEOL2] && ISSET(lflg, IEXTEN))) && (c) != _POSIX_VDISABLE)) |
| 470 | |
| 471 | |
| 472 | |
| 473 | /* |
| 474 | * ttyinput() helper. |
| 475 | * Call with the tty lock held. |
| 476 | */ |
| 477 | /* XXX static */ int |
| 478 | ttyinput_wlock(int c, struct tty *tp) |
| 479 | { |
| 480 | int iflag, lflag, i, error; |
| 481 | u_char *cc; |
| 482 | |
| 483 | KASSERT(mutex_owned(&tty_lock)); |
| 484 | |
| 485 | /* |
| 486 | * If input is pending take it first. |
| 487 | */ |
| 488 | lflag = tp->t_lflag; |
| 489 | if (ISSET(lflag, PENDIN)) |
| 490 | ttypend(tp); |
| 491 | /* |
| 492 | * Gather stats. |
| 493 | */ |
| 494 | if (ISSET(lflag, ICANON)) { |
| 495 | ++tk_cancc; |
| 496 | ++tp->t_cancc; |
| 497 | } else { |
| 498 | ++tk_rawcc; |
| 499 | ++tp->t_rawcc; |
| 500 | } |
| 501 | ++tk_nin; |
| 502 | |
| 503 | cc = tp->t_cc; |
| 504 | |
| 505 | /* |
| 506 | * Handle exceptional conditions (break, parity, framing). |
| 507 | */ |
| 508 | iflag = tp->t_iflag; |
| 509 | if ((error = (ISSET(c, TTY_ERRORMASK))) != 0) { |
| 510 | CLR(c, TTY_ERRORMASK); |
| 511 | if (ISSET(error, TTY_FE) && c == 0) { /* Break. */ |
| 512 | if (ISSET(iflag, IGNBRK)) |
| 513 | return (0); |
| 514 | else if (ISSET(iflag, BRKINT)) { |
| 515 | ttyflush(tp, FREAD | FWRITE); |
| 516 | ttysig(tp, TTYSIG_PG1, SIGINT); |
| 517 | return (0); |
| 518 | } else if (ISSET(iflag, PARMRK)) |
| 519 | goto parmrk; |
| 520 | } else if ((ISSET(error, TTY_PE) && ISSET(iflag, INPCK)) || |
| 521 | ISSET(error, TTY_FE)) { |
| 522 | if (ISSET(iflag, IGNPAR)) |
| 523 | return (0); |
| 524 | else if (ISSET(iflag, PARMRK)) { |
| 525 | parmrk: (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); |
| 526 | (void)putc(0 | TTY_QUOTE, &tp->t_rawq); |
| 527 | (void)putc(c | TTY_QUOTE, &tp->t_rawq); |
| 528 | return (0); |
| 529 | } else |
| 530 | c = 0; |
| 531 | } |
| 532 | } else if (c == 0377 && |
| 533 | ISSET(iflag, ISTRIP|IGNPAR|INPCK|PARMRK) == (INPCK|PARMRK)) { |
| 534 | /* "Escape" a valid character of '\377'. */ |
| 535 | (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); |
| 536 | (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); |
| 537 | goto endcase; |
| 538 | } |
| 539 | |
| 540 | /* |
| 541 | * In tandem mode, check high water mark. |
| 542 | */ |
| 543 | if (ISSET(iflag, IXOFF) || ISSET(tp->t_cflag, CHWFLOW)) |
| 544 | ttyblock(tp); |
| 545 | if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) |
| 546 | CLR(c, 0x80); |
| 547 | if (!ISSET(lflag, EXTPROC)) { |
| 548 | /* |
| 549 | * Check for literal nexting very first |
| 550 | */ |
| 551 | if (ISSET(tp->t_state, TS_LNCH)) { |
| 552 | SET(c, TTY_QUOTE); |
| 553 | CLR(tp->t_state, TS_LNCH); |
| 554 | } |
| 555 | /* |
| 556 | * Scan for special characters. This code |
| 557 | * is really just a big case statement with |
| 558 | * non-constant cases. The bottom of the |
| 559 | * case statement is labeled ``endcase'', so goto |
| 560 | * it after a case match, or similar. |
| 561 | */ |
| 562 | |
| 563 | /* |
| 564 | * Control chars which aren't controlled |
| 565 | * by ICANON, ISIG, or IXON. |
| 566 | */ |
| 567 | if (ISSET(lflag, IEXTEN)) { |
| 568 | if (CCEQ(cc[VLNEXT], c)) { |
| 569 | if (ISSET(lflag, ECHO)) { |
| 570 | if (ISSET(lflag, ECHOE)) { |
| 571 | (void)ttyoutput('^', tp); |
| 572 | (void)ttyoutput('\b', tp); |
| 573 | } else |
| 574 | ttyecho(c, tp); |
| 575 | } |
| 576 | SET(tp->t_state, TS_LNCH); |
| 577 | goto endcase; |
| 578 | } |
| 579 | if (CCEQ(cc[VDISCARD], c)) { |
| 580 | if (ISSET(lflag, FLUSHO)) |
| 581 | CLR(tp->t_lflag, FLUSHO); |
| 582 | else { |
| 583 | ttyflush(tp, FWRITE); |
| 584 | ttyecho(c, tp); |
| 585 | if (tp->t_rawq.c_cc + tp->t_canq.c_cc) |
| 586 | ttyretype(tp); |
| 587 | SET(tp->t_lflag, FLUSHO); |
| 588 | } |
| 589 | goto startoutput; |
| 590 | } |
| 591 | } |
| 592 | /* |
| 593 | * Signals. |
| 594 | */ |
| 595 | if (ISSET(lflag, ISIG)) { |
| 596 | if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { |
| 597 | if (!ISSET(lflag, NOFLSH)) |
| 598 | ttyflush(tp, FREAD | FWRITE); |
| 599 | ttyecho(c, tp); |
| 600 | ttysig(tp, TTYSIG_PG1, CCEQ(cc[VINTR], c) ? |
| 601 | SIGINT : SIGQUIT); |
| 602 | goto endcase; |
| 603 | } |
| 604 | if (CCEQ(cc[VSUSP], c)) { |
| 605 | if (!ISSET(lflag, NOFLSH)) |
| 606 | ttyflush(tp, FREAD); |
| 607 | ttyecho(c, tp); |
| 608 | ttysig(tp, TTYSIG_PG1, SIGTSTP); |
| 609 | goto endcase; |
| 610 | } |
| 611 | } |
| 612 | /* |
| 613 | * Handle start/stop characters. |
| 614 | */ |
| 615 | if (ISSET(iflag, IXON)) { |
| 616 | if (CCEQ(cc[VSTOP], c)) { |
| 617 | if (!ISSET(tp->t_state, TS_TTSTOP)) { |
| 618 | SET(tp->t_state, TS_TTSTOP); |
| 619 | cdev_stop(tp, 0); |
| 620 | return (0); |
| 621 | } |
| 622 | if (!CCEQ(cc[VSTART], c)) |
| 623 | return (0); |
| 624 | /* |
| 625 | * if VSTART == VSTOP then toggle |
| 626 | */ |
| 627 | goto endcase; |
| 628 | } |
| 629 | if (CCEQ(cc[VSTART], c)) |
| 630 | goto restartoutput; |
| 631 | } |
| 632 | /* |
| 633 | * IGNCR, ICRNL, & INLCR |
| 634 | */ |
| 635 | if (c == '\r') { |
| 636 | if (ISSET(iflag, IGNCR)) |
| 637 | goto endcase; |
| 638 | else if (ISSET(iflag, ICRNL)) |
| 639 | c = '\n'; |
| 640 | } else if (c == '\n' && ISSET(iflag, INLCR)) |
| 641 | c = '\r'; |
| 642 | } |
| 643 | if (!ISSET(lflag, EXTPROC) && ISSET(lflag, ICANON)) { |
| 644 | /* |
| 645 | * From here on down canonical mode character |
| 646 | * processing takes place. |
| 647 | */ |
| 648 | /* |
| 649 | * erase (^H / ^?) |
| 650 | */ |
| 651 | if (CCEQ(cc[VERASE], c)) { |
| 652 | if (tp->t_rawq.c_cc) |
| 653 | ttyrub(unputc(&tp->t_rawq), tp); |
| 654 | goto endcase; |
| 655 | } |
| 656 | /* |
| 657 | * kill (^U) |
| 658 | */ |
| 659 | if (CCEQ(cc[VKILL], c)) { |
| 660 | if (ISSET(lflag, ECHOKE) && |
| 661 | tp->t_rawq.c_cc == tp->t_rocount && |
| 662 | !ISSET(lflag, ECHOPRT)) |
| 663 | while (tp->t_rawq.c_cc) |
| 664 | ttyrub(unputc(&tp->t_rawq), tp); |
| 665 | else { |
| 666 | ttyecho(c, tp); |
| 667 | if (ISSET(lflag, ECHOK) || |
| 668 | ISSET(lflag, ECHOKE)) |
| 669 | ttyecho('\n', tp); |
| 670 | FLUSHQ(&tp->t_rawq); |
| 671 | tp->t_rocount = 0; |
| 672 | } |
| 673 | CLR(tp->t_state, TS_LOCAL); |
| 674 | goto endcase; |
| 675 | } |
| 676 | /* |
| 677 | * Extensions to the POSIX.1 GTI set of functions. |
| 678 | */ |
| 679 | if (ISSET(lflag, IEXTEN)) { |
| 680 | /* |
| 681 | * word erase (^W) |
| 682 | */ |
| 683 | if (CCEQ(cc[VWERASE], c)) { |
| 684 | int alt = ISSET(lflag, ALTWERASE); |
| 685 | int ctype; |
| 686 | |
| 687 | /* |
| 688 | * erase whitespace |
| 689 | */ |
| 690 | while ((c = unputc(&tp->t_rawq)) == ' ' || |
| 691 | c == '\t') |
| 692 | ttyrub(c, tp); |
| 693 | if (c == -1) |
| 694 | goto endcase; |
| 695 | /* |
| 696 | * erase last char of word and remember the |
| 697 | * next chars type (for ALTWERASE) |
| 698 | */ |
| 699 | ttyrub(c, tp); |
| 700 | c = unputc(&tp->t_rawq); |
| 701 | if (c == -1) |
| 702 | goto endcase; |
| 703 | if (c == ' ' || c == '\t') { |
| 704 | (void)putc(c, &tp->t_rawq); |
| 705 | goto endcase; |
| 706 | } |
| 707 | ctype = ISALPHA(c); |
| 708 | /* |
| 709 | * erase rest of word |
| 710 | */ |
| 711 | do { |
| 712 | ttyrub(c, tp); |
| 713 | c = unputc(&tp->t_rawq); |
| 714 | if (c == -1) |
| 715 | goto endcase; |
| 716 | } while (c != ' ' && c != '\t' && |
| 717 | (alt == 0 || ISALPHA(c) == ctype)); |
| 718 | (void)putc(c, &tp->t_rawq); |
| 719 | goto endcase; |
| 720 | } |
| 721 | /* |
| 722 | * reprint line (^R) |
| 723 | */ |
| 724 | if (CCEQ(cc[VREPRINT], c)) { |
| 725 | ttyretype(tp); |
| 726 | goto endcase; |
| 727 | } |
| 728 | /* |
| 729 | * ^T - kernel info and generate SIGINFO |
| 730 | */ |
| 731 | if (CCEQ(cc[VSTATUS], c)) { |
| 732 | ttysig(tp, TTYSIG_PG1, SIGINFO); |
| 733 | goto endcase; |
| 734 | } |
| 735 | } |
| 736 | } |
| 737 | /* |
| 738 | * Check for input buffer overflow |
| 739 | */ |
| 740 | if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= TTYHOG) { |
| 741 | if (ISSET(iflag, IMAXBEL)) { |
| 742 | if (tp->t_outq.c_cc < tp->t_hiwat) |
| 743 | (void)ttyoutput(CTRL('g'), tp); |
| 744 | } else |
| 745 | ttyflush(tp, FREAD | FWRITE); |
| 746 | goto endcase; |
| 747 | } |
| 748 | /* |
| 749 | * Put data char in q for user and |
| 750 | * wakeup on seeing a line delimiter. |
| 751 | */ |
| 752 | if (putc(c, &tp->t_rawq) >= 0) { |
| 753 | if (!ISSET(lflag, ICANON)) { |
| 754 | ttwakeup(tp); |
| 755 | ttyecho(c, tp); |
| 756 | goto endcase; |
| 757 | } |
| 758 | if (TTBREAKC(c, lflag)) { |
| 759 | tp->t_rocount = 0; |
| 760 | catq(&tp->t_rawq, &tp->t_canq); |
| 761 | ttwakeup(tp); |
| 762 | } else if (tp->t_rocount++ == 0) |
| 763 | tp->t_rocol = tp->t_column; |
| 764 | if (ISSET(tp->t_state, TS_ERASE)) { |
| 765 | /* |
| 766 | * end of prterase \.../ |
| 767 | */ |
| 768 | CLR(tp->t_state, TS_ERASE); |
| 769 | (void)ttyoutput('/', tp); |
| 770 | } |
| 771 | i = tp->t_column; |
| 772 | ttyecho(c, tp); |
| 773 | if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { |
| 774 | /* |
| 775 | * Place the cursor over the '^' of the ^D. |
| 776 | */ |
| 777 | i = min(2, tp->t_column - i); |
| 778 | while (i > 0) { |
| 779 | (void)ttyoutput('\b', tp); |
| 780 | i--; |
| 781 | } |
| 782 | } |
| 783 | } |
| 784 | endcase: |
| 785 | /* |
| 786 | * IXANY means allow any character to restart output. |
| 787 | */ |
| 788 | if (ISSET(tp->t_state, TS_TTSTOP) && |
| 789 | !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) { |
| 790 | return (0); |
| 791 | } |
| 792 | restartoutput: |
| 793 | CLR(tp->t_lflag, FLUSHO); |
| 794 | CLR(tp->t_state, TS_TTSTOP); |
| 795 | startoutput: |
| 796 | return (ttstart(tp)); |
| 797 | } |
| 798 | |
| 799 | /* |
| 800 | * Process input of a single character received on a tty. |
| 801 | * |
| 802 | * XXX - this is a hack, all drivers must changed to acquire the |
| 803 | * lock before calling linesw->l_rint() |
| 804 | */ |
| 805 | int |
| 806 | ttyinput(int c, struct tty *tp) |
| 807 | { |
| 808 | int error; |
| 809 | |
| 810 | /* |
| 811 | * Unless the receiver is enabled, drop incoming data. |
| 812 | */ |
| 813 | if (!ISSET(tp->t_cflag, CREAD)) |
| 814 | return (0); |
| 815 | |
| 816 | mutex_spin_enter(&tty_lock); |
| 817 | error = ttyinput_wlock(c, tp); |
| 818 | mutex_spin_exit(&tty_lock); |
| 819 | |
| 820 | return (error); |
| 821 | } |
| 822 | |
| 823 | /* |
| 824 | * Output a single character on a tty, doing output processing |
| 825 | * as needed (expanding tabs, newline processing, etc.). |
| 826 | * Returns < 0 if succeeds, otherwise returns char to resend. |
| 827 | * Must be recursive. |
| 828 | * |
| 829 | * Call with tty lock held. |
| 830 | */ |
| 831 | int |
| 832 | ttyoutput(int c, struct tty *tp) |
| 833 | { |
| 834 | long oflag; |
| 835 | int col, notout; |
| 836 | |
| 837 | KASSERT(mutex_owned(&tty_lock)); |
| 838 | |
| 839 | oflag = tp->t_oflag; |
| 840 | if (!ISSET(oflag, OPOST)) { |
| 841 | tk_nout++; |
| 842 | tp->t_outcc++; |
| 843 | if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) |
| 844 | return (c); |
| 845 | return (-1); |
| 846 | } |
| 847 | /* |
| 848 | * Do tab expansion if OXTABS is set. Special case if we do external |
| 849 | * processing, we don't do the tab expansion because we'll probably |
| 850 | * get it wrong. If tab expansion needs to be done, let it happen |
| 851 | * externally. |
| 852 | */ |
| 853 | CLR(c, ~TTY_CHARMASK); |
| 854 | if (c == '\t' && |
| 855 | ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { |
| 856 | c = 8 - (tp->t_column & 7); |
| 857 | if (ISSET(tp->t_lflag, FLUSHO)) { |
| 858 | notout = 0; |
| 859 | } else { |
| 860 | notout = b_to_q(" " , c, &tp->t_outq); |
| 861 | c -= notout; |
| 862 | tk_nout += c; |
| 863 | tp->t_outcc += c; |
| 864 | } |
| 865 | tp->t_column += c; |
| 866 | return (notout ? '\t' : -1); |
| 867 | } |
| 868 | if (c == CEOT && ISSET(oflag, ONOEOT)) |
| 869 | return (-1); |
| 870 | |
| 871 | /* |
| 872 | * Newline translation: if ONLCR is set, |
| 873 | * translate newline into "\r\n". |
| 874 | */ |
| 875 | if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { |
| 876 | tk_nout++; |
| 877 | tp->t_outcc++; |
| 878 | if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) |
| 879 | return (c); |
| 880 | } |
| 881 | /* If OCRNL is set, translate "\r" into "\n". */ |
| 882 | else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) |
| 883 | c = '\n'; |
| 884 | /* If ONOCR is set, don't transmit CRs when on column 0. */ |
| 885 | else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) |
| 886 | return (-1); |
| 887 | |
| 888 | tk_nout++; |
| 889 | tp->t_outcc++; |
| 890 | if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) |
| 891 | return (c); |
| 892 | |
| 893 | col = tp->t_column; |
| 894 | switch (CCLASS(c)) { |
| 895 | case BACKSPACE: |
| 896 | if (col > 0) |
| 897 | --col; |
| 898 | break; |
| 899 | case CONTROL: |
| 900 | break; |
| 901 | case NEWLINE: |
| 902 | if (ISSET(tp->t_oflag, ONLCR | ONLRET)) |
| 903 | col = 0; |
| 904 | break; |
| 905 | case RETURN: |
| 906 | col = 0; |
| 907 | break; |
| 908 | case ORDINARY: |
| 909 | ++col; |
| 910 | break; |
| 911 | case TAB: |
| 912 | col = (col + 8) & ~7; |
| 913 | break; |
| 914 | } |
| 915 | tp->t_column = col; |
| 916 | return (-1); |
| 917 | } |
| 918 | |
| 919 | /* |
| 920 | * Ioctls for all tty devices. Called after line-discipline specific ioctl |
| 921 | * has been called to do discipline-specific functions and/or reject any |
| 922 | * of these ioctl commands. |
| 923 | */ |
| 924 | /* ARGSUSED */ |
| 925 | int |
| 926 | ttioctl(struct tty *tp, u_long cmd, void *data, int flag, struct lwp *l) |
| 927 | { |
| 928 | extern struct tty *constty; /* Temporary virtual console. */ |
| 929 | struct proc *p; |
| 930 | struct linesw *lp; |
| 931 | int s, error; |
| 932 | struct pathbuf *pb; |
| 933 | struct nameidata nd; |
| 934 | char infobuf[200]; |
| 935 | |
| 936 | KASSERT(l != NULL); |
| 937 | p = l->l_proc; |
| 938 | |
| 939 | /* If the ioctl involves modification, hang if in the background. */ |
| 940 | switch (cmd) { |
| 941 | case TIOCFLUSH: |
| 942 | case TIOCDRAIN: |
| 943 | case TIOCSBRK: |
| 944 | case TIOCCBRK: |
| 945 | case TIOCSTART: |
| 946 | case TIOCSETA: |
| 947 | case TIOCSETD: |
| 948 | case TIOCSLINED: |
| 949 | case TIOCSETAF: |
| 950 | case TIOCSETAW: |
| 951 | #ifdef notdef |
| 952 | case TIOCSPGRP: |
| 953 | case FIOSETOWN: |
| 954 | #endif |
| 955 | case TIOCSTAT: |
| 956 | case TIOCSTI: |
| 957 | case TIOCSWINSZ: |
| 958 | case TIOCSQSIZE: |
| 959 | case TIOCLBIC: |
| 960 | case TIOCLBIS: |
| 961 | case TIOCLSET: |
| 962 | case TIOCSETC: |
| 963 | case OTIOCSETD: |
| 964 | case TIOCSETN: |
| 965 | case TIOCSETP: |
| 966 | case TIOCSLTC: |
| 967 | mutex_spin_enter(&tty_lock); |
| 968 | while (isbackground(curproc, tp) && |
| 969 | p->p_pgrp->pg_jobc && (p->p_lflag & PL_PPWAIT) == 0 && |
| 970 | !sigismasked(l, SIGTTOU)) { |
| 971 | mutex_spin_exit(&tty_lock); |
| 972 | |
| 973 | mutex_enter(proc_lock); |
| 974 | pgsignal(p->p_pgrp, SIGTTOU, 1); |
| 975 | mutex_exit(proc_lock); |
| 976 | |
| 977 | mutex_spin_enter(&tty_lock); |
| 978 | error = ttypause(tp, hz); |
| 979 | if (error) { |
| 980 | mutex_spin_exit(&tty_lock); |
| 981 | return (error); |
| 982 | } |
| 983 | } |
| 984 | mutex_spin_exit(&tty_lock); |
| 985 | break; |
| 986 | } |
| 987 | |
| 988 | switch (cmd) { /* Process the ioctl. */ |
| 989 | case FIOASYNC: /* set/clear async i/o */ |
| 990 | mutex_spin_enter(&tty_lock); |
| 991 | if (*(int *)data) |
| 992 | SET(tp->t_state, TS_ASYNC); |
| 993 | else |
| 994 | CLR(tp->t_state, TS_ASYNC); |
| 995 | mutex_spin_exit(&tty_lock); |
| 996 | break; |
| 997 | case FIONBIO: /* set/clear non-blocking i/o */ |
| 998 | break; /* XXX: delete. */ |
| 999 | case FIONREAD: /* get # bytes to read */ |
| 1000 | mutex_spin_enter(&tty_lock); |
| 1001 | *(int *)data = ttnread(tp); |
| 1002 | mutex_spin_exit(&tty_lock); |
| 1003 | break; |
| 1004 | case FIONWRITE: /* get # bytes to written & unsent */ |
| 1005 | mutex_spin_enter(&tty_lock); |
| 1006 | *(int *)data = tp->t_outq.c_cc; |
| 1007 | mutex_spin_exit(&tty_lock); |
| 1008 | break; |
| 1009 | case FIONSPACE: /* get # bytes to written & unsent */ |
| 1010 | mutex_spin_enter(&tty_lock); |
| 1011 | *(int *)data = tp->t_outq.c_cn - tp->t_outq.c_cc; |
| 1012 | mutex_spin_exit(&tty_lock); |
| 1013 | break; |
| 1014 | case TIOCEXCL: /* set exclusive use of tty */ |
| 1015 | mutex_spin_enter(&tty_lock); |
| 1016 | SET(tp->t_state, TS_XCLUDE); |
| 1017 | mutex_spin_exit(&tty_lock); |
| 1018 | break; |
| 1019 | case TIOCFLUSH: { /* flush buffers */ |
| 1020 | int flags = *(int *)data; |
| 1021 | |
| 1022 | if (flags == 0) |
| 1023 | flags = FREAD | FWRITE; |
| 1024 | else |
| 1025 | flags &= FREAD | FWRITE; |
| 1026 | mutex_spin_enter(&tty_lock); |
| 1027 | ttyflush(tp, flags); |
| 1028 | mutex_spin_exit(&tty_lock); |
| 1029 | break; |
| 1030 | } |
| 1031 | case TIOCCONS: /* become virtual console */ |
| 1032 | if (*(int *)data) { |
| 1033 | if (constty && constty != tp && |
| 1034 | ISSET(constty->t_state, TS_CARR_ON | TS_ISOPEN) == |
| 1035 | (TS_CARR_ON | TS_ISOPEN)) |
| 1036 | return EBUSY; |
| 1037 | |
| 1038 | pb = pathbuf_create("/dev/console" ); |
| 1039 | if (pb == NULL) { |
| 1040 | return ENOMEM; |
| 1041 | } |
| 1042 | NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, pb); |
| 1043 | if ((error = namei(&nd)) != 0) { |
| 1044 | pathbuf_destroy(pb); |
| 1045 | return error; |
| 1046 | } |
| 1047 | error = VOP_ACCESS(nd.ni_vp, VREAD, l->l_cred); |
| 1048 | vput(nd.ni_vp); |
| 1049 | pathbuf_destroy(pb); |
| 1050 | if (error) |
| 1051 | return error; |
| 1052 | |
| 1053 | constty = tp; |
| 1054 | } else if (tp == constty) |
| 1055 | constty = NULL; |
| 1056 | break; |
| 1057 | case TIOCDRAIN: /* wait till output drained */ |
| 1058 | if ((error = ttywait(tp)) != 0) |
| 1059 | return (error); |
| 1060 | break; |
| 1061 | case TIOCGETA: { /* get termios struct */ |
| 1062 | struct termios *t = (struct termios *)data; |
| 1063 | |
| 1064 | memcpy(t, &tp->t_termios, sizeof(struct termios)); |
| 1065 | break; |
| 1066 | } |
| 1067 | case TIOCGETD: /* get line discipline (old) */ |
| 1068 | *(int *)data = tp->t_linesw->l_no; |
| 1069 | break; |
| 1070 | case TIOCGLINED: /* get line discipline (new) */ |
| 1071 | (void)strncpy((char *)data, tp->t_linesw->l_name, |
| 1072 | TTLINEDNAMELEN - 1); |
| 1073 | break; |
| 1074 | case TIOCGWINSZ: /* get window size */ |
| 1075 | *(struct winsize *)data = tp->t_winsize; |
| 1076 | break; |
| 1077 | case TIOCGQSIZE: |
| 1078 | *(int *)data = tp->t_qsize; |
| 1079 | break; |
| 1080 | case FIOGETOWN: |
| 1081 | mutex_enter(proc_lock); |
| 1082 | if (tp->t_session != NULL && !isctty(p, tp)) { |
| 1083 | mutex_exit(proc_lock); |
| 1084 | return (ENOTTY); |
| 1085 | } |
| 1086 | *(int *)data = tp->t_pgrp ? -tp->t_pgrp->pg_id : 0; |
| 1087 | mutex_exit(proc_lock); |
| 1088 | break; |
| 1089 | case TIOCGPGRP: /* get pgrp of tty */ |
| 1090 | mutex_enter(proc_lock); |
| 1091 | if (!isctty(p, tp)) { |
| 1092 | mutex_exit(proc_lock); |
| 1093 | return (ENOTTY); |
| 1094 | } |
| 1095 | *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PGID; |
| 1096 | mutex_exit(proc_lock); |
| 1097 | break; |
| 1098 | case TIOCGSID: /* get sid of tty */ |
| 1099 | mutex_enter(proc_lock); |
| 1100 | if (!isctty(p, tp)) { |
| 1101 | mutex_exit(proc_lock); |
| 1102 | return (ENOTTY); |
| 1103 | } |
| 1104 | *(int *)data = tp->t_session->s_sid; |
| 1105 | mutex_exit(proc_lock); |
| 1106 | break; |
| 1107 | #ifdef TIOCHPCL |
| 1108 | case TIOCHPCL: /* hang up on last close */ |
| 1109 | mutex_spin_enter(&tty_lock); |
| 1110 | SET(tp->t_cflag, HUPCL); |
| 1111 | mutex_spin_exit(&tty_lock); |
| 1112 | break; |
| 1113 | #endif |
| 1114 | case TIOCNXCL: /* reset exclusive use of tty */ |
| 1115 | mutex_spin_enter(&tty_lock); |
| 1116 | CLR(tp->t_state, TS_XCLUDE); |
| 1117 | mutex_spin_exit(&tty_lock); |
| 1118 | break; |
| 1119 | case TIOCOUTQ: /* output queue size */ |
| 1120 | *(int *)data = tp->t_outq.c_cc; |
| 1121 | break; |
| 1122 | case TIOCSETA: /* set termios struct */ |
| 1123 | case TIOCSETAW: /* drain output, set */ |
| 1124 | case TIOCSETAF: { /* drn out, fls in, set */ |
| 1125 | struct termios *t = (struct termios *)data; |
| 1126 | |
| 1127 | if (cmd == TIOCSETAW || cmd == TIOCSETAF) { |
| 1128 | if ((error = ttywait(tp)) != 0) |
| 1129 | return (error); |
| 1130 | |
| 1131 | if (cmd == TIOCSETAF) { |
| 1132 | mutex_spin_enter(&tty_lock); |
| 1133 | ttyflush(tp, FREAD); |
| 1134 | mutex_spin_exit(&tty_lock); |
| 1135 | } |
| 1136 | } |
| 1137 | |
| 1138 | s = spltty(); |
| 1139 | /* |
| 1140 | * XXXSMP - some drivers call back on us from t_param(), so |
| 1141 | * don't take the tty spin lock here. |
| 1142 | * require t_param() to unlock upon callback? |
| 1143 | */ |
| 1144 | /* wanted here: mutex_spin_enter(&tty_lock); */ |
| 1145 | if (!ISSET(t->c_cflag, CIGNORE)) { |
| 1146 | /* |
| 1147 | * Set device hardware. |
| 1148 | */ |
| 1149 | if (tp->t_param && (error = (*tp->t_param)(tp, t))) { |
| 1150 | /* wanted here: mutex_spin_exit(&tty_lock); */ |
| 1151 | splx(s); |
| 1152 | return (error); |
| 1153 | } else { |
| 1154 | tp->t_cflag = t->c_cflag; |
| 1155 | tp->t_ispeed = t->c_ispeed; |
| 1156 | tp->t_ospeed = t->c_ospeed; |
| 1157 | if (t->c_ospeed == 0) |
| 1158 | ttysig(tp, TTYSIG_LEADER, SIGHUP); |
| 1159 | } |
| 1160 | ttsetwater(tp); |
| 1161 | } |
| 1162 | |
| 1163 | /* delayed lock acquiring */ |
| 1164 | mutex_spin_enter(&tty_lock); |
| 1165 | if (cmd != TIOCSETAF) { |
| 1166 | if (ISSET(t->c_lflag, ICANON) != |
| 1167 | ISSET(tp->t_lflag, ICANON)) { |
| 1168 | if (ISSET(t->c_lflag, ICANON)) { |
| 1169 | SET(tp->t_lflag, PENDIN); |
| 1170 | ttwakeup(tp); |
| 1171 | } else { |
| 1172 | struct clist tq; |
| 1173 | |
| 1174 | catq(&tp->t_rawq, &tp->t_canq); |
| 1175 | tq = tp->t_rawq; |
| 1176 | tp->t_rawq = tp->t_canq; |
| 1177 | tp->t_canq = tq; |
| 1178 | CLR(tp->t_lflag, PENDIN); |
| 1179 | } |
| 1180 | } |
| 1181 | } |
| 1182 | tp->t_iflag = t->c_iflag; |
| 1183 | tp->t_oflag = t->c_oflag; |
| 1184 | /* |
| 1185 | * Make the EXTPROC bit read only. |
| 1186 | */ |
| 1187 | if (ISSET(tp->t_lflag, EXTPROC)) |
| 1188 | SET(t->c_lflag, EXTPROC); |
| 1189 | else |
| 1190 | CLR(t->c_lflag, EXTPROC); |
| 1191 | tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); |
| 1192 | memcpy(tp->t_cc, t->c_cc, sizeof(t->c_cc)); |
| 1193 | mutex_spin_exit(&tty_lock); |
| 1194 | splx(s); |
| 1195 | break; |
| 1196 | } |
| 1197 | case TIOCSETD: /* set line discipline (old) */ |
| 1198 | lp = ttyldisc_lookup_bynum(*(int *)data); |
| 1199 | goto setldisc; |
| 1200 | |
| 1201 | case TIOCSLINED: { /* set line discipline (new) */ |
| 1202 | char *name = (char *)data; |
| 1203 | dev_t device; |
| 1204 | |
| 1205 | /* Null terminate to prevent buffer overflow */ |
| 1206 | name[TTLINEDNAMELEN - 1] = '\0'; |
| 1207 | lp = ttyldisc_lookup(name); |
| 1208 | setldisc: |
| 1209 | if (lp == NULL) |
| 1210 | return (ENXIO); |
| 1211 | |
| 1212 | if (lp != tp->t_linesw) { |
| 1213 | device = tp->t_dev; |
| 1214 | s = spltty(); |
| 1215 | (*tp->t_linesw->l_close)(tp, flag); |
| 1216 | error = (*lp->l_open)(device, tp); |
| 1217 | if (error) { |
| 1218 | (void)(*tp->t_linesw->l_open)(device, tp); |
| 1219 | splx(s); |
| 1220 | ttyldisc_release(lp); |
| 1221 | return (error); |
| 1222 | } |
| 1223 | ttyldisc_release(tp->t_linesw); |
| 1224 | tp->t_linesw = lp; |
| 1225 | splx(s); |
| 1226 | } else { |
| 1227 | /* Drop extra reference. */ |
| 1228 | ttyldisc_release(lp); |
| 1229 | } |
| 1230 | break; |
| 1231 | } |
| 1232 | case TIOCSTART: /* start output, like ^Q */ |
| 1233 | mutex_spin_enter(&tty_lock); |
| 1234 | if (ISSET(tp->t_state, TS_TTSTOP) || |
| 1235 | ISSET(tp->t_lflag, FLUSHO)) { |
| 1236 | CLR(tp->t_lflag, FLUSHO); |
| 1237 | CLR(tp->t_state, TS_TTSTOP); |
| 1238 | ttstart(tp); |
| 1239 | } |
| 1240 | mutex_spin_exit(&tty_lock); |
| 1241 | break; |
| 1242 | case TIOCSTI: /* simulate terminal input */ |
| 1243 | if ((error = kauth_authorize_device_tty(l->l_cred, |
| 1244 | KAUTH_DEVICE_TTY_STI, tp)) != 0) { |
| 1245 | if (!ISSET(flag, FREAD)) |
| 1246 | return EPERM; |
| 1247 | if (!isctty(p, tp)) |
| 1248 | return EACCES; |
| 1249 | if (tp->t_session->s_leader->p_cred != p->p_cred) |
| 1250 | return error; |
| 1251 | } |
| 1252 | (*tp->t_linesw->l_rint)(*(u_char *)data, tp); |
| 1253 | break; |
| 1254 | case TIOCSTOP: /* stop output, like ^S */ |
| 1255 | { |
| 1256 | mutex_spin_enter(&tty_lock); |
| 1257 | if (!ISSET(tp->t_state, TS_TTSTOP)) { |
| 1258 | SET(tp->t_state, TS_TTSTOP); |
| 1259 | cdev_stop(tp, 0); |
| 1260 | } |
| 1261 | mutex_spin_exit(&tty_lock); |
| 1262 | break; |
| 1263 | } |
| 1264 | case TIOCSCTTY: /* become controlling tty */ |
| 1265 | mutex_enter(proc_lock); |
| 1266 | mutex_spin_enter(&tty_lock); |
| 1267 | |
| 1268 | /* Session ctty vnode pointer set in vnode layer. */ |
| 1269 | if (!SESS_LEADER(p) || |
| 1270 | ((p->p_session->s_ttyvp || tp->t_session) && |
| 1271 | (tp->t_session != p->p_session))) { |
| 1272 | mutex_spin_exit(&tty_lock); |
| 1273 | mutex_exit(proc_lock); |
| 1274 | return (EPERM); |
| 1275 | } |
| 1276 | |
| 1277 | /* |
| 1278 | * `p_session' acquires a reference. |
| 1279 | * But note that if `t_session' is set at this point, |
| 1280 | * it must equal `p_session', in which case the session |
| 1281 | * already has the correct reference count. |
| 1282 | */ |
| 1283 | if (tp->t_session == NULL) { |
| 1284 | proc_sesshold(p->p_session); |
| 1285 | } |
| 1286 | tp->t_session = p->p_session; |
| 1287 | tp->t_pgrp = p->p_pgrp; |
| 1288 | p->p_session->s_ttyp = tp; |
| 1289 | p->p_lflag |= PL_CONTROLT; |
| 1290 | mutex_spin_exit(&tty_lock); |
| 1291 | mutex_exit(proc_lock); |
| 1292 | break; |
| 1293 | case FIOSETOWN: { /* set pgrp of tty */ |
| 1294 | pid_t pgid = *(pid_t *)data; |
| 1295 | struct pgrp *pgrp; |
| 1296 | |
| 1297 | mutex_enter(proc_lock); |
| 1298 | if (tp->t_session != NULL && !isctty(p, tp)) { |
| 1299 | mutex_exit(proc_lock); |
| 1300 | return (ENOTTY); |
| 1301 | } |
| 1302 | |
| 1303 | if (pgid < 0) { |
| 1304 | pgrp = pgrp_find(-pgid); |
| 1305 | if (pgrp == NULL) { |
| 1306 | mutex_exit(proc_lock); |
| 1307 | return (EINVAL); |
| 1308 | } |
| 1309 | } else { |
| 1310 | struct proc *p1; |
| 1311 | p1 = proc_find(pgid); |
| 1312 | if (!p1) { |
| 1313 | mutex_exit(proc_lock); |
| 1314 | return (ESRCH); |
| 1315 | } |
| 1316 | pgrp = p1->p_pgrp; |
| 1317 | } |
| 1318 | |
| 1319 | if (pgrp->pg_session != p->p_session) { |
| 1320 | mutex_exit(proc_lock); |
| 1321 | return (EPERM); |
| 1322 | } |
| 1323 | mutex_spin_enter(&tty_lock); |
| 1324 | tp->t_pgrp = pgrp; |
| 1325 | mutex_spin_exit(&tty_lock); |
| 1326 | mutex_exit(proc_lock); |
| 1327 | break; |
| 1328 | } |
| 1329 | case TIOCSPGRP: { /* set pgrp of tty */ |
| 1330 | struct pgrp *pgrp; |
| 1331 | pid_t pgid = *(pid_t *)data; |
| 1332 | |
| 1333 | if (pgid == NO_PGID) |
| 1334 | return EINVAL; |
| 1335 | |
| 1336 | mutex_enter(proc_lock); |
| 1337 | if (!isctty(p, tp)) { |
| 1338 | mutex_exit(proc_lock); |
| 1339 | return (ENOTTY); |
| 1340 | } |
| 1341 | pgrp = pgrp_find(pgid); |
| 1342 | if (pgrp == NULL || pgrp->pg_session != p->p_session) { |
| 1343 | mutex_exit(proc_lock); |
| 1344 | return (EPERM); |
| 1345 | } |
| 1346 | mutex_spin_enter(&tty_lock); |
| 1347 | tp->t_pgrp = pgrp; |
| 1348 | mutex_spin_exit(&tty_lock); |
| 1349 | mutex_exit(proc_lock); |
| 1350 | break; |
| 1351 | } |
| 1352 | case TIOCSTAT: /* get load avg stats */ |
| 1353 | mutex_enter(proc_lock); |
| 1354 | ttygetinfo(tp, 0, infobuf, sizeof(infobuf)); |
| 1355 | mutex_exit(proc_lock); |
| 1356 | |
| 1357 | mutex_spin_enter(&tty_lock); |
| 1358 | ttyputinfo(tp, infobuf); |
| 1359 | mutex_spin_exit(&tty_lock); |
| 1360 | break; |
| 1361 | case TIOCSWINSZ: /* set window size */ |
| 1362 | mutex_spin_enter(&tty_lock); |
| 1363 | if (memcmp((void *)&tp->t_winsize, data, |
| 1364 | sizeof(struct winsize))) { |
| 1365 | tp->t_winsize = *(struct winsize *)data; |
| 1366 | ttysig(tp, TTYSIG_PG1, SIGWINCH); |
| 1367 | } |
| 1368 | mutex_spin_exit(&tty_lock); |
| 1369 | break; |
| 1370 | case TIOCSQSIZE: |
| 1371 | if ((error = tty_get_qsize(&s, *(int *)data)) == 0 && |
| 1372 | s != tp->t_qsize) |
| 1373 | error = tty_set_qsize(tp, s); |
| 1374 | return error; |
| 1375 | |
| 1376 | case TIOCSBRK: |
| 1377 | case TIOCCBRK: |
| 1378 | case TIOCSDTR: |
| 1379 | case TIOCCDTR: |
| 1380 | case TIOCSFLAGS: |
| 1381 | case TIOCGFLAGS: |
| 1382 | case TIOCMSET: |
| 1383 | case TIOCMGET: |
| 1384 | case TIOCMBIS: |
| 1385 | case TIOCMBIC: |
| 1386 | /* Handled by the driver layer */ |
| 1387 | return EPASSTHROUGH; |
| 1388 | |
| 1389 | case TIOCEXT: |
| 1390 | case TIOCPTSNAME: |
| 1391 | case TIOCGRANTPT: |
| 1392 | case TIOCPKT: |
| 1393 | case TIOCUCNTL: |
| 1394 | case TIOCREMOTE: |
| 1395 | case TIOCSIG: |
| 1396 | /* for ptys */ |
| 1397 | return EPASSTHROUGH; |
| 1398 | |
| 1399 | default: |
| 1400 | /* Pass through various console ioctls */ |
| 1401 | switch (IOCGROUP(cmd)) { |
| 1402 | case 'c': /* syscons console */ |
| 1403 | case 'v': /* usl console, video - where one letter */ |
| 1404 | case 'K': /* usl console, keyboard - aint enough */ |
| 1405 | case 'V': /* pcvt compat */ |
| 1406 | case 'W': /* wscons console */ |
| 1407 | return EPASSTHROUGH; |
| 1408 | default: |
| 1409 | break; |
| 1410 | } |
| 1411 | #ifdef COMPAT_60 |
| 1412 | error = compat_60_ttioctl(tp, cmd, data, flag, l); |
| 1413 | if (error != EPASSTHROUGH) |
| 1414 | return error; |
| 1415 | #endif /* COMPAT_60 */ |
| 1416 | /* We may have to load the compat module for this. */ |
| 1417 | for (;;) { |
| 1418 | rw_enter(&ttcompat_lock, RW_READER); |
| 1419 | if (ttcompatvec != NULL) { |
| 1420 | break; |
| 1421 | } |
| 1422 | rw_exit(&ttcompat_lock); |
| 1423 | (void)module_autoload("compat" , MODULE_CLASS_ANY); |
| 1424 | if (ttcompatvec == NULL) { |
| 1425 | return EPASSTHROUGH; |
| 1426 | } |
| 1427 | } |
| 1428 | error = (*ttcompatvec)(tp, cmd, data, flag, l); |
| 1429 | rw_exit(&ttcompat_lock); |
| 1430 | return error; |
| 1431 | } |
| 1432 | return (0); |
| 1433 | } |
| 1434 | |
| 1435 | int |
| 1436 | ttpoll(struct tty *tp, int events, struct lwp *l) |
| 1437 | { |
| 1438 | int revents; |
| 1439 | |
| 1440 | revents = 0; |
| 1441 | mutex_spin_enter(&tty_lock); |
| 1442 | if (events & (POLLIN | POLLRDNORM)) |
| 1443 | if (ttnread(tp) > 0) |
| 1444 | revents |= events & (POLLIN | POLLRDNORM); |
| 1445 | |
| 1446 | if (events & (POLLOUT | POLLWRNORM)) |
| 1447 | if (tp->t_outq.c_cc <= tp->t_lowat) |
| 1448 | revents |= events & (POLLOUT | POLLWRNORM); |
| 1449 | |
| 1450 | if (events & POLLHUP) |
| 1451 | if (!CONNECTED(tp)) |
| 1452 | revents |= POLLHUP; |
| 1453 | |
| 1454 | if (revents == 0) { |
| 1455 | if (events & (POLLIN | POLLHUP | POLLRDNORM)) |
| 1456 | selrecord(l, &tp->t_rsel); |
| 1457 | |
| 1458 | if (events & (POLLOUT | POLLWRNORM)) |
| 1459 | selrecord(l, &tp->t_wsel); |
| 1460 | } |
| 1461 | |
| 1462 | mutex_spin_exit(&tty_lock); |
| 1463 | |
| 1464 | return (revents); |
| 1465 | } |
| 1466 | |
| 1467 | static void |
| 1468 | filt_ttyrdetach(struct knote *kn) |
| 1469 | { |
| 1470 | struct tty *tp; |
| 1471 | |
| 1472 | tp = kn->kn_hook; |
| 1473 | mutex_spin_enter(&tty_lock); |
| 1474 | SLIST_REMOVE(&tp->t_rsel.sel_klist, kn, knote, kn_selnext); |
| 1475 | mutex_spin_exit(&tty_lock); |
| 1476 | } |
| 1477 | |
| 1478 | static int |
| 1479 | filt_ttyread(struct knote *kn, long hint) |
| 1480 | { |
| 1481 | struct tty *tp; |
| 1482 | |
| 1483 | tp = kn->kn_hook; |
| 1484 | if ((hint & NOTE_SUBMIT) == 0) |
| 1485 | mutex_spin_enter(&tty_lock); |
| 1486 | kn->kn_data = ttnread(tp); |
| 1487 | if ((hint & NOTE_SUBMIT) == 0) |
| 1488 | mutex_spin_exit(&tty_lock); |
| 1489 | return (kn->kn_data > 0); |
| 1490 | } |
| 1491 | |
| 1492 | static void |
| 1493 | filt_ttywdetach(struct knote *kn) |
| 1494 | { |
| 1495 | struct tty *tp; |
| 1496 | |
| 1497 | tp = kn->kn_hook; |
| 1498 | mutex_spin_enter(&tty_lock); |
| 1499 | SLIST_REMOVE(&tp->t_wsel.sel_klist, kn, knote, kn_selnext); |
| 1500 | mutex_spin_exit(&tty_lock); |
| 1501 | } |
| 1502 | |
| 1503 | static int |
| 1504 | filt_ttywrite(struct knote *kn, long hint) |
| 1505 | { |
| 1506 | struct tty *tp; |
| 1507 | int canwrite; |
| 1508 | |
| 1509 | tp = kn->kn_hook; |
| 1510 | if ((hint & NOTE_SUBMIT) == 0) |
| 1511 | mutex_spin_enter(&tty_lock); |
| 1512 | kn->kn_data = tp->t_outq.c_cn - tp->t_outq.c_cc; |
| 1513 | canwrite = (tp->t_outq.c_cc <= tp->t_lowat) && CONNECTED(tp); |
| 1514 | if ((hint & NOTE_SUBMIT) == 0) |
| 1515 | mutex_spin_exit(&tty_lock); |
| 1516 | return (canwrite); |
| 1517 | } |
| 1518 | |
| 1519 | static const struct filterops ttyread_filtops = |
| 1520 | { 1, NULL, filt_ttyrdetach, filt_ttyread }; |
| 1521 | static const struct filterops ttywrite_filtops = |
| 1522 | { 1, NULL, filt_ttywdetach, filt_ttywrite }; |
| 1523 | |
| 1524 | int |
| 1525 | ttykqfilter(dev_t dev, struct knote *kn) |
| 1526 | { |
| 1527 | struct tty *tp; |
| 1528 | struct klist *klist; |
| 1529 | |
| 1530 | if ((tp = cdev_tty(dev)) == NULL) |
| 1531 | return (ENXIO); |
| 1532 | |
| 1533 | switch (kn->kn_filter) { |
| 1534 | case EVFILT_READ: |
| 1535 | klist = &tp->t_rsel.sel_klist; |
| 1536 | kn->kn_fop = &ttyread_filtops; |
| 1537 | break; |
| 1538 | case EVFILT_WRITE: |
| 1539 | klist = &tp->t_wsel.sel_klist; |
| 1540 | kn->kn_fop = &ttywrite_filtops; |
| 1541 | break; |
| 1542 | default: |
| 1543 | return EINVAL; |
| 1544 | } |
| 1545 | |
| 1546 | kn->kn_hook = tp; |
| 1547 | |
| 1548 | mutex_spin_enter(&tty_lock); |
| 1549 | SLIST_INSERT_HEAD(klist, kn, kn_selnext); |
| 1550 | mutex_spin_exit(&tty_lock); |
| 1551 | |
| 1552 | return (0); |
| 1553 | } |
| 1554 | |
| 1555 | /* |
| 1556 | * Find the number of chars ready to be read from this tty. |
| 1557 | * Call with the tty lock held. |
| 1558 | */ |
| 1559 | static int |
| 1560 | ttnread(struct tty *tp) |
| 1561 | { |
| 1562 | int nread; |
| 1563 | |
| 1564 | KASSERT(mutex_owned(&tty_lock)); |
| 1565 | |
| 1566 | if (ISSET(tp->t_lflag, PENDIN)) |
| 1567 | ttypend(tp); |
| 1568 | nread = tp->t_canq.c_cc; |
| 1569 | if (!ISSET(tp->t_lflag, ICANON)) { |
| 1570 | nread += tp->t_rawq.c_cc; |
| 1571 | if (nread < tp->t_cc[VMIN] && !tp->t_cc[VTIME]) |
| 1572 | nread = 0; |
| 1573 | } |
| 1574 | return (nread); |
| 1575 | } |
| 1576 | |
| 1577 | /* |
| 1578 | * Wait for output to drain, or if this times out, flush it. |
| 1579 | */ |
| 1580 | static int |
| 1581 | ttywait_timo(struct tty *tp, int timo) |
| 1582 | { |
| 1583 | int error; |
| 1584 | |
| 1585 | error = 0; |
| 1586 | |
| 1587 | mutex_spin_enter(&tty_lock); |
| 1588 | while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && |
| 1589 | CONNECTED(tp) && tp->t_oproc) { |
| 1590 | (*tp->t_oproc)(tp); |
| 1591 | error = ttysleep(tp, &tp->t_outcv, true, timo); |
| 1592 | if (error == EWOULDBLOCK) |
| 1593 | ttyflush(tp, FWRITE); |
| 1594 | if (error) |
| 1595 | break; |
| 1596 | } |
| 1597 | mutex_spin_exit(&tty_lock); |
| 1598 | |
| 1599 | return (error); |
| 1600 | } |
| 1601 | |
| 1602 | /* |
| 1603 | * Wait for output to drain. |
| 1604 | */ |
| 1605 | int |
| 1606 | ttywait(struct tty *tp) |
| 1607 | { |
| 1608 | return ttywait_timo(tp, 0); |
| 1609 | } |
| 1610 | |
| 1611 | /* |
| 1612 | * Flush if successfully wait. |
| 1613 | */ |
| 1614 | int |
| 1615 | ttywflush(struct tty *tp) |
| 1616 | { |
| 1617 | int error; |
| 1618 | |
| 1619 | error = ttywait_timo(tp, 5 * hz); |
| 1620 | if (error == 0 || error == EWOULDBLOCK) { |
| 1621 | mutex_spin_enter(&tty_lock); |
| 1622 | ttyflush(tp, FREAD); |
| 1623 | mutex_spin_exit(&tty_lock); |
| 1624 | } |
| 1625 | return (error); |
| 1626 | } |
| 1627 | |
| 1628 | /* |
| 1629 | * Flush tty read and/or write queues, notifying anyone waiting. |
| 1630 | * Call with the tty lock held. |
| 1631 | */ |
| 1632 | void |
| 1633 | ttyflush(struct tty *tp, int rw) |
| 1634 | { |
| 1635 | |
| 1636 | KASSERT(mutex_owned(&tty_lock)); |
| 1637 | |
| 1638 | if (rw & FREAD) { |
| 1639 | FLUSHQ(&tp->t_canq); |
| 1640 | FLUSHQ(&tp->t_rawq); |
| 1641 | tp->t_rocount = 0; |
| 1642 | tp->t_rocol = 0; |
| 1643 | CLR(tp->t_state, TS_LOCAL); |
| 1644 | ttwakeup(tp); |
| 1645 | } |
| 1646 | if (rw & FWRITE) { |
| 1647 | CLR(tp->t_state, TS_TTSTOP); |
| 1648 | cdev_stop(tp, rw); |
| 1649 | FLUSHQ(&tp->t_outq); |
| 1650 | cv_broadcast(&tp->t_outcv); |
| 1651 | selnotify(&tp->t_wsel, 0, NOTE_SUBMIT); |
| 1652 | } |
| 1653 | } |
| 1654 | |
| 1655 | /* |
| 1656 | * Copy in the default termios characters. |
| 1657 | */ |
| 1658 | void |
| 1659 | ttychars(struct tty *tp) |
| 1660 | { |
| 1661 | |
| 1662 | memcpy(tp->t_cc, ttydefchars, sizeof(ttydefchars)); |
| 1663 | } |
| 1664 | |
| 1665 | /* |
| 1666 | * Send stop character on input overflow. |
| 1667 | * Call with the tty lock held. |
| 1668 | */ |
| 1669 | static void |
| 1670 | ttyblock(struct tty *tp) |
| 1671 | { |
| 1672 | int total; |
| 1673 | |
| 1674 | KASSERT(mutex_owned(&tty_lock)); |
| 1675 | |
| 1676 | total = tp->t_rawq.c_cc + tp->t_canq.c_cc; |
| 1677 | if (tp->t_rawq.c_cc > TTYHOG) { |
| 1678 | ttyflush(tp, FREAD | FWRITE); |
| 1679 | CLR(tp->t_state, TS_TBLOCK); |
| 1680 | } |
| 1681 | /* |
| 1682 | * Block further input iff: current input > threshold |
| 1683 | * AND input is available to user program. |
| 1684 | */ |
| 1685 | if (total >= TTYHOG / 2 && |
| 1686 | !ISSET(tp->t_state, TS_TBLOCK) && |
| 1687 | (!ISSET(tp->t_lflag, ICANON) || tp->t_canq.c_cc > 0)) { |
| 1688 | if (ISSET(tp->t_iflag, IXOFF) && |
| 1689 | tp->t_cc[VSTOP] != _POSIX_VDISABLE && |
| 1690 | putc(tp->t_cc[VSTOP], &tp->t_outq) == 0) { |
| 1691 | SET(tp->t_state, TS_TBLOCK); |
| 1692 | ttstart(tp); |
| 1693 | } |
| 1694 | /* Try to block remote output via hardware flow control. */ |
| 1695 | if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow && |
| 1696 | (*tp->t_hwiflow)(tp, 1) != 0) |
| 1697 | SET(tp->t_state, TS_TBLOCK); |
| 1698 | } |
| 1699 | } |
| 1700 | |
| 1701 | /* |
| 1702 | * Delayed line discipline output |
| 1703 | */ |
| 1704 | void |
| 1705 | ttrstrt(void *tp_arg) |
| 1706 | { |
| 1707 | struct tty *tp; |
| 1708 | |
| 1709 | #ifdef DIAGNOSTIC |
| 1710 | if (tp_arg == NULL) |
| 1711 | panic("ttrstrt" ); |
| 1712 | #endif |
| 1713 | tp = tp_arg; |
| 1714 | mutex_spin_enter(&tty_lock); |
| 1715 | |
| 1716 | CLR(tp->t_state, TS_TIMEOUT); |
| 1717 | ttstart(tp); /* XXX - Shouldn't this be tp->l_start(tp)? */ |
| 1718 | |
| 1719 | mutex_spin_exit(&tty_lock); |
| 1720 | } |
| 1721 | |
| 1722 | /* |
| 1723 | * start a line discipline |
| 1724 | * Always call with tty lock held? |
| 1725 | */ |
| 1726 | int |
| 1727 | ttstart(struct tty *tp) |
| 1728 | { |
| 1729 | |
| 1730 | if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ |
| 1731 | (*tp->t_oproc)(tp); |
| 1732 | return (0); |
| 1733 | } |
| 1734 | |
| 1735 | /* |
| 1736 | * "close" a line discipline |
| 1737 | */ |
| 1738 | int |
| 1739 | ttylclose(struct tty *tp, int flag) |
| 1740 | { |
| 1741 | |
| 1742 | if (flag & FNONBLOCK) { |
| 1743 | mutex_spin_enter(&tty_lock); |
| 1744 | ttyflush(tp, FREAD | FWRITE); |
| 1745 | mutex_spin_exit(&tty_lock); |
| 1746 | } else |
| 1747 | ttywflush(tp); |
| 1748 | return (0); |
| 1749 | } |
| 1750 | |
| 1751 | /* |
| 1752 | * Handle modem control transition on a tty. |
| 1753 | * Flag indicates new state of carrier. |
| 1754 | * Returns 0 if the line should be turned off, otherwise 1. |
| 1755 | */ |
| 1756 | int |
| 1757 | ttymodem(struct tty *tp, int flag) |
| 1758 | { |
| 1759 | |
| 1760 | mutex_spin_enter(&tty_lock); |
| 1761 | if (flag == 0) { |
| 1762 | if (ISSET(tp->t_state, TS_CARR_ON)) { |
| 1763 | /* |
| 1764 | * Lost carrier. |
| 1765 | */ |
| 1766 | CLR(tp->t_state, TS_CARR_ON); |
| 1767 | if (ISSET(tp->t_state, TS_ISOPEN) && !CONNECTED(tp)) { |
| 1768 | ttysig(tp, TTYSIG_LEADER, SIGHUP); |
| 1769 | ttyflush(tp, FREAD | FWRITE); |
| 1770 | mutex_spin_exit(&tty_lock); |
| 1771 | return (0); |
| 1772 | } |
| 1773 | } |
| 1774 | } else { |
| 1775 | if (!ISSET(tp->t_state, TS_CARR_ON)) { |
| 1776 | /* |
| 1777 | * Carrier now on. |
| 1778 | */ |
| 1779 | SET(tp->t_state, TS_CARR_ON); |
| 1780 | ttwakeup(tp); |
| 1781 | } |
| 1782 | } |
| 1783 | mutex_spin_exit(&tty_lock); |
| 1784 | |
| 1785 | return (1); |
| 1786 | } |
| 1787 | |
| 1788 | /* |
| 1789 | * Default modem control routine (for other line disciplines). |
| 1790 | * Return argument flag, to turn off device on carrier drop. |
| 1791 | */ |
| 1792 | int |
| 1793 | nullmodem(struct tty *tp, int flag) |
| 1794 | { |
| 1795 | |
| 1796 | mutex_spin_enter(&tty_lock); |
| 1797 | if (flag) |
| 1798 | SET(tp->t_state, TS_CARR_ON); |
| 1799 | else { |
| 1800 | CLR(tp->t_state, TS_CARR_ON); |
| 1801 | if (!CONNECTED(tp)) { |
| 1802 | ttysig(tp, TTYSIG_LEADER, SIGHUP); |
| 1803 | mutex_spin_exit(&tty_lock); |
| 1804 | return (0); |
| 1805 | } |
| 1806 | } |
| 1807 | mutex_spin_exit(&tty_lock); |
| 1808 | |
| 1809 | return (1); |
| 1810 | } |
| 1811 | |
| 1812 | /* |
| 1813 | * Reinput pending characters after state switch. |
| 1814 | */ |
| 1815 | void |
| 1816 | ttypend(struct tty *tp) |
| 1817 | { |
| 1818 | struct clist tq; |
| 1819 | int c; |
| 1820 | |
| 1821 | KASSERT(mutex_owned(&tty_lock)); |
| 1822 | |
| 1823 | CLR(tp->t_lflag, PENDIN); |
| 1824 | SET(tp->t_state, TS_TYPEN); |
| 1825 | tq = tp->t_rawq; |
| 1826 | tp->t_rawq.c_cc = 0; |
| 1827 | tp->t_rawq.c_cf = tp->t_rawq.c_cl = 0; |
| 1828 | while ((c = getc(&tq)) >= 0) |
| 1829 | ttyinput_wlock(c, tp); |
| 1830 | CLR(tp->t_state, TS_TYPEN); |
| 1831 | } |
| 1832 | |
| 1833 | /* |
| 1834 | * Process a read call on a tty device. |
| 1835 | */ |
| 1836 | int |
| 1837 | ttread(struct tty *tp, struct uio *uio, int flag) |
| 1838 | { |
| 1839 | struct clist *qp; |
| 1840 | u_char *cc; |
| 1841 | struct proc *p; |
| 1842 | int c, first, error, has_stime, last_cc; |
| 1843 | long lflag, slp; |
| 1844 | struct timeval now, stime; |
| 1845 | |
| 1846 | if (uio->uio_resid == 0) |
| 1847 | return 0; |
| 1848 | |
| 1849 | stime.tv_usec = 0; /* XXX gcc */ |
| 1850 | stime.tv_sec = 0; /* XXX gcc */ |
| 1851 | |
| 1852 | cc = tp->t_cc; |
| 1853 | p = curproc; |
| 1854 | error = 0; |
| 1855 | has_stime = 0; |
| 1856 | last_cc = 0; |
| 1857 | slp = 0; |
| 1858 | |
| 1859 | loop: |
| 1860 | mutex_spin_enter(&tty_lock); |
| 1861 | lflag = tp->t_lflag; |
| 1862 | /* |
| 1863 | * take pending input first |
| 1864 | */ |
| 1865 | if (ISSET(lflag, PENDIN)) |
| 1866 | ttypend(tp); |
| 1867 | |
| 1868 | /* |
| 1869 | * Hang process if it's in the background. |
| 1870 | */ |
| 1871 | if (isbackground(p, tp)) { |
| 1872 | if (sigismasked(curlwp, SIGTTIN) || |
| 1873 | p->p_lflag & PL_PPWAIT || p->p_pgrp->pg_jobc == 0) { |
| 1874 | mutex_spin_exit(&tty_lock); |
| 1875 | return (EIO); |
| 1876 | } |
| 1877 | mutex_spin_exit(&tty_lock); |
| 1878 | |
| 1879 | mutex_enter(proc_lock); |
| 1880 | pgsignal(p->p_pgrp, SIGTTIN, 1); |
| 1881 | mutex_exit(proc_lock); |
| 1882 | |
| 1883 | mutex_spin_enter(&tty_lock); |
| 1884 | error = ttypause(tp, hz); |
| 1885 | mutex_spin_exit(&tty_lock); |
| 1886 | if (error) |
| 1887 | return (error); |
| 1888 | goto loop; |
| 1889 | } |
| 1890 | |
| 1891 | if (!ISSET(lflag, ICANON)) { |
| 1892 | int m = cc[VMIN]; |
| 1893 | long t = cc[VTIME]; |
| 1894 | |
| 1895 | qp = &tp->t_rawq; |
| 1896 | /* |
| 1897 | * Check each of the four combinations. |
| 1898 | * (m > 0 && t == 0) is the normal read case. |
| 1899 | * It should be fairly efficient, so we check that and its |
| 1900 | * companion case (m == 0 && t == 0) first. |
| 1901 | * For the other two cases, we compute the target sleep time |
| 1902 | * into slp. |
| 1903 | */ |
| 1904 | if (t == 0) { |
| 1905 | if (qp->c_cc < m) |
| 1906 | goto sleep; |
| 1907 | goto read; |
| 1908 | } |
| 1909 | t *= hz; /* time in deca-ticks */ |
| 1910 | /* |
| 1911 | * Time difference in deca-ticks, split division to avoid numeric overflow. |
| 1912 | * Ok for hz < ~200kHz |
| 1913 | */ |
| 1914 | #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 10 * hz + \ |
| 1915 | ((t1).tv_usec - (t2).tv_usec) / 100 * hz / 1000) |
| 1916 | if (m > 0) { |
| 1917 | if (qp->c_cc <= 0) |
| 1918 | goto sleep; |
| 1919 | if (qp->c_cc >= m) |
| 1920 | goto read; |
| 1921 | if (!has_stime) { |
| 1922 | /* first character, start timer */ |
| 1923 | has_stime = 1; |
| 1924 | getmicrotime(&stime); |
| 1925 | slp = t; |
| 1926 | } else if (qp->c_cc > last_cc) { |
| 1927 | /* got a character, restart timer */ |
| 1928 | getmicrotime(&stime); |
| 1929 | slp = t; |
| 1930 | } else { |
| 1931 | /* nothing, check expiration */ |
| 1932 | getmicrotime(&now); |
| 1933 | slp = t - diff(now, stime); |
| 1934 | } |
| 1935 | } else { /* m == 0 */ |
| 1936 | if (qp->c_cc > 0) |
| 1937 | goto read; |
| 1938 | if (!has_stime) { |
| 1939 | has_stime = 1; |
| 1940 | getmicrotime(&stime); |
| 1941 | slp = t; |
| 1942 | } else { |
| 1943 | getmicrotime(&now); |
| 1944 | slp = t - diff(now, stime); |
| 1945 | } |
| 1946 | } |
| 1947 | last_cc = qp->c_cc; |
| 1948 | #undef diff |
| 1949 | if (slp > 0) { |
| 1950 | /* |
| 1951 | * Convert deca-ticks back to ticks. |
| 1952 | * Rounding down may make us wake up just short |
| 1953 | * of the target, so we round up. |
| 1954 | * Maybe we should do 'slp/10 + 1' because the |
| 1955 | * first tick maybe almost immediate. |
| 1956 | * However it is more useful for a program that sets |
| 1957 | * VTIME=10 to wakeup every second not every 1.01 |
| 1958 | * seconds (if hz=100). |
| 1959 | */ |
| 1960 | slp = (slp + 9)/ 10; |
| 1961 | goto sleep; |
| 1962 | } |
| 1963 | } else if ((qp = &tp->t_canq)->c_cc <= 0) { |
| 1964 | int carrier; |
| 1965 | |
| 1966 | sleep: |
| 1967 | /* |
| 1968 | * If there is no input, sleep on rawq |
| 1969 | * awaiting hardware receipt and notification. |
| 1970 | * If we have data, we don't need to check for carrier. |
| 1971 | */ |
| 1972 | carrier = CONNECTED(tp); |
| 1973 | if (!carrier && ISSET(tp->t_state, TS_ISOPEN)) { |
| 1974 | mutex_spin_exit(&tty_lock); |
| 1975 | return (0); /* EOF */ |
| 1976 | } |
| 1977 | if (!has_stime || slp <= 0) { |
| 1978 | if (flag & IO_NDELAY) { |
| 1979 | mutex_spin_exit(&tty_lock); |
| 1980 | return (EWOULDBLOCK); |
| 1981 | } |
| 1982 | } |
| 1983 | error = ttysleep(tp, &tp->t_rawcv, true, slp); |
| 1984 | mutex_spin_exit(&tty_lock); |
| 1985 | /* VMIN == 0: any quantity read satisfies */ |
| 1986 | if (cc[VMIN] == 0 && error == EWOULDBLOCK) |
| 1987 | return (0); |
| 1988 | if (error && error != EWOULDBLOCK) |
| 1989 | return (error); |
| 1990 | goto loop; |
| 1991 | } |
| 1992 | read: |
| 1993 | |
| 1994 | /* |
| 1995 | * Input present, check for input mapping and processing. |
| 1996 | */ |
| 1997 | first = 1; |
| 1998 | while ((c = getc(qp)) >= 0) { |
| 1999 | /* |
| 2000 | * delayed suspend (^Y) |
| 2001 | */ |
| 2002 | if (CCEQ(cc[VDSUSP], c) && |
| 2003 | ISSET(lflag, IEXTEN|ISIG) == (IEXTEN|ISIG)) { |
| 2004 | ttysig(tp, TTYSIG_PG1, SIGTSTP); |
| 2005 | if (first) { |
| 2006 | error = ttypause(tp, hz); |
| 2007 | if (error) |
| 2008 | break; |
| 2009 | mutex_spin_exit(&tty_lock); |
| 2010 | goto loop; |
| 2011 | } |
| 2012 | break; |
| 2013 | } |
| 2014 | /* |
| 2015 | * Interpret EOF only in canonical mode. |
| 2016 | */ |
| 2017 | if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) |
| 2018 | break; |
| 2019 | /* |
| 2020 | * Give user character. |
| 2021 | */ |
| 2022 | mutex_spin_exit(&tty_lock); |
| 2023 | error = ureadc(c, uio); |
| 2024 | mutex_spin_enter(&tty_lock); |
| 2025 | if (error) |
| 2026 | break; |
| 2027 | if (uio->uio_resid == 0) |
| 2028 | break; |
| 2029 | /* |
| 2030 | * In canonical mode check for a "break character" |
| 2031 | * marking the end of a "line of input". |
| 2032 | */ |
| 2033 | if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) |
| 2034 | break; |
| 2035 | first = 0; |
| 2036 | } |
| 2037 | |
| 2038 | /* |
| 2039 | * Look to unblock output now that (presumably) |
| 2040 | * the input queue has gone down. |
| 2041 | */ |
| 2042 | if (ISSET(tp->t_state, TS_TBLOCK) && tp->t_rawq.c_cc < TTYHOG / 5) { |
| 2043 | if (ISSET(tp->t_iflag, IXOFF) && |
| 2044 | cc[VSTART] != _POSIX_VDISABLE && |
| 2045 | putc(cc[VSTART], &tp->t_outq) == 0) { |
| 2046 | CLR(tp->t_state, TS_TBLOCK); |
| 2047 | ttstart(tp); |
| 2048 | } |
| 2049 | /* Try to unblock remote output via hardware flow control. */ |
| 2050 | if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow && |
| 2051 | (*tp->t_hwiflow)(tp, 0) != 0) |
| 2052 | CLR(tp->t_state, TS_TBLOCK); |
| 2053 | } |
| 2054 | mutex_spin_exit(&tty_lock); |
| 2055 | |
| 2056 | return (error); |
| 2057 | } |
| 2058 | |
| 2059 | /* |
| 2060 | * Check the output queue on tp for space for a kernel message (from uprintf |
| 2061 | * or tprintf). Allow some space over the normal hiwater mark so we don't |
| 2062 | * lose messages due to normal flow control, but don't let the tty run amok. |
| 2063 | * Sleeps here are not interruptible, but we return prematurely if new signals |
| 2064 | * arrive. |
| 2065 | * Call with tty lock held. |
| 2066 | */ |
| 2067 | static int |
| 2068 | ttycheckoutq_wlock(struct tty *tp, int wait) |
| 2069 | { |
| 2070 | int hiwat, error; |
| 2071 | |
| 2072 | KASSERT(mutex_owned(&tty_lock)); |
| 2073 | |
| 2074 | hiwat = tp->t_hiwat; |
| 2075 | if (tp->t_outq.c_cc > hiwat + 200) |
| 2076 | while (tp->t_outq.c_cc > hiwat) { |
| 2077 | ttstart(tp); |
| 2078 | if (wait == 0) |
| 2079 | return (0); |
| 2080 | error = ttysleep(tp, &tp->t_outcv, true, hz); |
| 2081 | if (error == EINTR) |
| 2082 | wait = 0; |
| 2083 | } |
| 2084 | |
| 2085 | return (1); |
| 2086 | } |
| 2087 | |
| 2088 | int |
| 2089 | ttycheckoutq(struct tty *tp, int wait) |
| 2090 | { |
| 2091 | int r; |
| 2092 | |
| 2093 | mutex_spin_enter(&tty_lock); |
| 2094 | r = ttycheckoutq_wlock(tp, wait); |
| 2095 | mutex_spin_exit(&tty_lock); |
| 2096 | |
| 2097 | return (r); |
| 2098 | } |
| 2099 | |
| 2100 | /* |
| 2101 | * Process a write call on a tty device. |
| 2102 | */ |
| 2103 | int |
| 2104 | ttwrite(struct tty *tp, struct uio *uio, int flag) |
| 2105 | { |
| 2106 | u_char *cp; |
| 2107 | struct proc *p; |
| 2108 | int cc, ce, i, hiwat, error; |
| 2109 | u_char obuf[OBUFSIZ]; |
| 2110 | |
| 2111 | cp = NULL; |
| 2112 | hiwat = tp->t_hiwat; |
| 2113 | error = 0; |
| 2114 | cc = 0; |
| 2115 | loop: |
| 2116 | mutex_spin_enter(&tty_lock); |
| 2117 | if (!CONNECTED(tp)) { |
| 2118 | if (ISSET(tp->t_state, TS_ISOPEN)) { |
| 2119 | mutex_spin_exit(&tty_lock); |
| 2120 | return (EIO); |
| 2121 | } else if (flag & IO_NDELAY) { |
| 2122 | mutex_spin_exit(&tty_lock); |
| 2123 | error = EWOULDBLOCK; |
| 2124 | goto out; |
| 2125 | } else { |
| 2126 | /* Sleep awaiting carrier. */ |
| 2127 | error = ttysleep(tp, &tp->t_rawcv, true, 0); |
| 2128 | mutex_spin_exit(&tty_lock); |
| 2129 | if (error) |
| 2130 | goto out; |
| 2131 | goto loop; |
| 2132 | } |
| 2133 | } |
| 2134 | |
| 2135 | /* |
| 2136 | * Hang the process if it's in the background. |
| 2137 | */ |
| 2138 | p = curproc; |
| 2139 | if (isbackground(p, tp) && |
| 2140 | ISSET(tp->t_lflag, TOSTOP) && (p->p_lflag & PL_PPWAIT) == 0 && |
| 2141 | !sigismasked(curlwp, SIGTTOU)) { |
| 2142 | if (p->p_pgrp->pg_jobc == 0) { |
| 2143 | error = EIO; |
| 2144 | mutex_spin_exit(&tty_lock); |
| 2145 | goto out; |
| 2146 | } |
| 2147 | mutex_spin_exit(&tty_lock); |
| 2148 | |
| 2149 | mutex_enter(proc_lock); |
| 2150 | pgsignal(p->p_pgrp, SIGTTOU, 1); |
| 2151 | mutex_exit(proc_lock); |
| 2152 | |
| 2153 | mutex_spin_enter(&tty_lock); |
| 2154 | error = ttypause(tp, hz); |
| 2155 | mutex_spin_exit(&tty_lock); |
| 2156 | if (error) |
| 2157 | goto out; |
| 2158 | goto loop; |
| 2159 | } |
| 2160 | mutex_spin_exit(&tty_lock); |
| 2161 | |
| 2162 | /* |
| 2163 | * Process the user's data in at most OBUFSIZ chunks. Perform any |
| 2164 | * output translation. Keep track of high water mark, sleep on |
| 2165 | * overflow awaiting device aid in acquiring new space. |
| 2166 | */ |
| 2167 | while (uio->uio_resid > 0 || cc > 0) { |
| 2168 | if (ISSET(tp->t_lflag, FLUSHO)) { |
| 2169 | uio->uio_resid = 0; |
| 2170 | return (0); |
| 2171 | } |
| 2172 | if (tp->t_outq.c_cc > hiwat) |
| 2173 | goto ovhiwat; |
| 2174 | /* |
| 2175 | * Grab a hunk of data from the user, unless we have some |
| 2176 | * leftover from last time. |
| 2177 | */ |
| 2178 | if (cc == 0) { |
| 2179 | cc = min(uio->uio_resid, OBUFSIZ); |
| 2180 | cp = obuf; |
| 2181 | error = uiomove(cp, cc, uio); |
| 2182 | if (error) { |
| 2183 | cc = 0; |
| 2184 | goto out; |
| 2185 | } |
| 2186 | } |
| 2187 | /* |
| 2188 | * If nothing fancy need be done, grab those characters we |
| 2189 | * can handle without any of ttyoutput's processing and |
| 2190 | * just transfer them to the output q. For those chars |
| 2191 | * which require special processing (as indicated by the |
| 2192 | * bits in char_type), call ttyoutput. After processing |
| 2193 | * a hunk of data, look for FLUSHO so ^O's will take effect |
| 2194 | * immediately. |
| 2195 | */ |
| 2196 | mutex_spin_enter(&tty_lock); |
| 2197 | while (cc > 0) { |
| 2198 | if (!ISSET(tp->t_oflag, OPOST)) |
| 2199 | ce = cc; |
| 2200 | else { |
| 2201 | ce = cc - scanc((u_int)cc, cp, char_type, |
| 2202 | CCLASSMASK); |
| 2203 | /* |
| 2204 | * If ce is zero, then we're processing |
| 2205 | * a special character through ttyoutput. |
| 2206 | */ |
| 2207 | if (ce == 0) { |
| 2208 | tp->t_rocount = 0; |
| 2209 | if (ttyoutput(*cp, tp) >= 0) { |
| 2210 | /* out of space */ |
| 2211 | mutex_spin_exit(&tty_lock); |
| 2212 | goto overfull; |
| 2213 | } |
| 2214 | cp++; |
| 2215 | cc--; |
| 2216 | if (ISSET(tp->t_lflag, FLUSHO) || |
| 2217 | tp->t_outq.c_cc > hiwat) { |
| 2218 | mutex_spin_exit(&tty_lock); |
| 2219 | goto ovhiwat; |
| 2220 | } |
| 2221 | continue; |
| 2222 | } |
| 2223 | } |
| 2224 | /* |
| 2225 | * A bunch of normal characters have been found. |
| 2226 | * Transfer them en masse to the output queue and |
| 2227 | * continue processing at the top of the loop. |
| 2228 | * If there are any further characters in this |
| 2229 | * <= OBUFSIZ chunk, the first should be a character |
| 2230 | * requiring special handling by ttyoutput. |
| 2231 | */ |
| 2232 | tp->t_rocount = 0; |
| 2233 | i = b_to_q(cp, ce, &tp->t_outq); |
| 2234 | ce -= i; |
| 2235 | tp->t_column += ce; |
| 2236 | cp += ce, cc -= ce, tk_nout += ce; |
| 2237 | tp->t_outcc += ce; |
| 2238 | if (i > 0) { |
| 2239 | /* out of space */ |
| 2240 | mutex_spin_exit(&tty_lock); |
| 2241 | goto overfull; |
| 2242 | } |
| 2243 | if (ISSET(tp->t_lflag, FLUSHO) || |
| 2244 | tp->t_outq.c_cc > hiwat) |
| 2245 | break; |
| 2246 | } |
| 2247 | ttstart(tp); |
| 2248 | mutex_spin_exit(&tty_lock); |
| 2249 | } |
| 2250 | |
| 2251 | out: |
| 2252 | /* |
| 2253 | * If cc is nonzero, we leave the uio structure inconsistent, as the |
| 2254 | * offset and iov pointers have moved forward, but it doesn't matter |
| 2255 | * (the call will either return short or restart with a new uio). |
| 2256 | */ |
| 2257 | uio->uio_resid += cc; |
| 2258 | return (error); |
| 2259 | |
| 2260 | overfull: |
| 2261 | /* |
| 2262 | * Since we are using ring buffers, if we can't insert any more into |
| 2263 | * the output queue, we can assume the ring is full and that someone |
| 2264 | * forgot to set the high water mark correctly. We set it and then |
| 2265 | * proceed as normal. |
| 2266 | */ |
| 2267 | hiwat = tp->t_outq.c_cc - 1; |
| 2268 | |
| 2269 | ovhiwat: |
| 2270 | mutex_spin_enter(&tty_lock); |
| 2271 | ttstart(tp); |
| 2272 | /* |
| 2273 | * This can only occur if FLUSHO is set in t_lflag, |
| 2274 | * or if ttstart/oproc is synchronous (or very fast). |
| 2275 | */ |
| 2276 | if (tp->t_outq.c_cc <= hiwat) { |
| 2277 | mutex_spin_exit(&tty_lock); |
| 2278 | goto loop; |
| 2279 | } |
| 2280 | if (flag & IO_NDELAY) { |
| 2281 | mutex_spin_exit(&tty_lock); |
| 2282 | error = EWOULDBLOCK; |
| 2283 | goto out; |
| 2284 | } |
| 2285 | error = ttysleep(tp, &tp->t_outcv, true, 0); |
| 2286 | mutex_spin_exit(&tty_lock); |
| 2287 | if (error) |
| 2288 | goto out; |
| 2289 | goto loop; |
| 2290 | } |
| 2291 | |
| 2292 | /* |
| 2293 | * Try to pull more output from the producer. Return non-zero if |
| 2294 | * there is output ready to be sent. |
| 2295 | */ |
| 2296 | bool |
| 2297 | ttypull(struct tty *tp) |
| 2298 | { |
| 2299 | |
| 2300 | /* XXXSMP not yet KASSERT(mutex_owned(&tty_lock)); */ |
| 2301 | |
| 2302 | if (tp->t_outq.c_cc <= tp->t_lowat) { |
| 2303 | cv_broadcast(&tp->t_outcv); |
| 2304 | selnotify(&tp->t_wsel, 0, NOTE_SUBMIT); |
| 2305 | } |
| 2306 | return tp->t_outq.c_cc != 0; |
| 2307 | } |
| 2308 | |
| 2309 | /* |
| 2310 | * Rubout one character from the rawq of tp |
| 2311 | * as cleanly as possible. |
| 2312 | * Called with tty lock held. |
| 2313 | */ |
| 2314 | void |
| 2315 | ttyrub(int c, struct tty *tp) |
| 2316 | { |
| 2317 | u_char *cp; |
| 2318 | int savecol, tabc; |
| 2319 | |
| 2320 | KASSERT(mutex_owned(&tty_lock)); |
| 2321 | |
| 2322 | if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) |
| 2323 | return; |
| 2324 | CLR(tp->t_lflag, FLUSHO); |
| 2325 | if (ISSET(tp->t_lflag, ECHOE)) { |
| 2326 | if (tp->t_rocount == 0) { |
| 2327 | /* |
| 2328 | * Screwed by ttwrite; retype |
| 2329 | */ |
| 2330 | ttyretype(tp); |
| 2331 | return; |
| 2332 | } |
| 2333 | if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) |
| 2334 | ttyrubo(tp, 2); |
| 2335 | else { |
| 2336 | CLR(c, ~TTY_CHARMASK); |
| 2337 | switch (CCLASS(c)) { |
| 2338 | case ORDINARY: |
| 2339 | ttyrubo(tp, 1); |
| 2340 | break; |
| 2341 | case BACKSPACE: |
| 2342 | case CONTROL: |
| 2343 | case NEWLINE: |
| 2344 | case RETURN: |
| 2345 | case VTAB: |
| 2346 | if (ISSET(tp->t_lflag, ECHOCTL)) |
| 2347 | ttyrubo(tp, 2); |
| 2348 | break; |
| 2349 | case TAB: |
| 2350 | if (tp->t_rocount < tp->t_rawq.c_cc) { |
| 2351 | ttyretype(tp); |
| 2352 | return; |
| 2353 | } |
| 2354 | savecol = tp->t_column; |
| 2355 | SET(tp->t_state, TS_CNTTB); |
| 2356 | SET(tp->t_lflag, FLUSHO); |
| 2357 | tp->t_column = tp->t_rocol; |
| 2358 | for (cp = firstc(&tp->t_rawq, &tabc); cp; |
| 2359 | cp = nextc(&tp->t_rawq, cp, &tabc)) |
| 2360 | ttyecho(tabc, tp); |
| 2361 | CLR(tp->t_lflag, FLUSHO); |
| 2362 | CLR(tp->t_state, TS_CNTTB); |
| 2363 | |
| 2364 | /* savecol will now be length of the tab. */ |
| 2365 | savecol -= tp->t_column; |
| 2366 | tp->t_column += savecol; |
| 2367 | if (savecol > 8) |
| 2368 | savecol = 8; /* overflow screw */ |
| 2369 | while (--savecol >= 0) |
| 2370 | (void)ttyoutput('\b', tp); |
| 2371 | break; |
| 2372 | default: /* XXX */ |
| 2373 | (void)printf("ttyrub: would panic c = %d, " |
| 2374 | "val = %d\n" , c, CCLASS(c)); |
| 2375 | } |
| 2376 | } |
| 2377 | } else if (ISSET(tp->t_lflag, ECHOPRT)) { |
| 2378 | if (!ISSET(tp->t_state, TS_ERASE)) { |
| 2379 | SET(tp->t_state, TS_ERASE); |
| 2380 | (void)ttyoutput('\\', tp); |
| 2381 | } |
| 2382 | ttyecho(c, tp); |
| 2383 | } else |
| 2384 | ttyecho(tp->t_cc[VERASE], tp); |
| 2385 | --tp->t_rocount; |
| 2386 | } |
| 2387 | |
| 2388 | /* |
| 2389 | * Back over cnt characters, erasing them. |
| 2390 | * Called with tty lock held. |
| 2391 | */ |
| 2392 | static void |
| 2393 | ttyrubo(struct tty *tp, int cnt) |
| 2394 | { |
| 2395 | |
| 2396 | KASSERT(mutex_owned(&tty_lock)); |
| 2397 | |
| 2398 | while (cnt-- > 0) { |
| 2399 | (void)ttyoutput('\b', tp); |
| 2400 | (void)ttyoutput(' ', tp); |
| 2401 | (void)ttyoutput('\b', tp); |
| 2402 | } |
| 2403 | } |
| 2404 | |
| 2405 | /* |
| 2406 | * ttyretype -- |
| 2407 | * Reprint the rawq line. Note, it is assumed that c_cc has already |
| 2408 | * been checked. |
| 2409 | * |
| 2410 | * Called with tty lock held. |
| 2411 | */ |
| 2412 | void |
| 2413 | ttyretype(struct tty *tp) |
| 2414 | { |
| 2415 | u_char *cp; |
| 2416 | int c; |
| 2417 | |
| 2418 | KASSERT(mutex_owned(&tty_lock)); |
| 2419 | |
| 2420 | /* Echo the reprint character. */ |
| 2421 | if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) |
| 2422 | ttyecho(tp->t_cc[VREPRINT], tp); |
| 2423 | |
| 2424 | (void)ttyoutput('\n', tp); |
| 2425 | |
| 2426 | for (cp = firstc(&tp->t_canq, &c); cp; cp = nextc(&tp->t_canq, cp, &c)) |
| 2427 | ttyecho(c, tp); |
| 2428 | for (cp = firstc(&tp->t_rawq, &c); cp; cp = nextc(&tp->t_rawq, cp, &c)) |
| 2429 | ttyecho(c, tp); |
| 2430 | CLR(tp->t_state, TS_ERASE); |
| 2431 | |
| 2432 | tp->t_rocount = tp->t_rawq.c_cc; |
| 2433 | tp->t_rocol = 0; |
| 2434 | } |
| 2435 | |
| 2436 | /* |
| 2437 | * Echo a typed character to the terminal. |
| 2438 | * Called with tty lock held. |
| 2439 | */ |
| 2440 | static void |
| 2441 | ttyecho(int c, struct tty *tp) |
| 2442 | { |
| 2443 | |
| 2444 | KASSERT(mutex_owned(&tty_lock)); |
| 2445 | |
| 2446 | if (!ISSET(tp->t_state, TS_CNTTB)) |
| 2447 | CLR(tp->t_lflag, FLUSHO); |
| 2448 | if ((!ISSET(tp->t_lflag, ECHO) && |
| 2449 | (!ISSET(tp->t_lflag, ECHONL) || c != '\n')) || |
| 2450 | ISSET(tp->t_lflag, EXTPROC)) |
| 2451 | return; |
| 2452 | if (((ISSET(tp->t_lflag, ECHOCTL) && |
| 2453 | (ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n')) || |
| 2454 | ISSET(c, TTY_CHARMASK) == 0177)) { |
| 2455 | (void)ttyoutput('^', tp); |
| 2456 | CLR(c, ~TTY_CHARMASK); |
| 2457 | if (c == 0177) |
| 2458 | c = '?'; |
| 2459 | else |
| 2460 | c += 'A' - 1; |
| 2461 | } |
| 2462 | (void)ttyoutput(c, tp); |
| 2463 | } |
| 2464 | |
| 2465 | /* |
| 2466 | * Wake up any readers on a tty. |
| 2467 | * Called with tty lock held. |
| 2468 | */ |
| 2469 | void |
| 2470 | ttwakeup(struct tty *tp) |
| 2471 | { |
| 2472 | |
| 2473 | KASSERT(mutex_owned(&tty_lock)); |
| 2474 | |
| 2475 | selnotify(&tp->t_rsel, 0, NOTE_SUBMIT); |
| 2476 | if (ISSET(tp->t_state, TS_ASYNC)) |
| 2477 | ttysig(tp, TTYSIG_PG2, SIGIO); |
| 2478 | cv_broadcast(&tp->t_rawcv); |
| 2479 | } |
| 2480 | |
| 2481 | /* |
| 2482 | * Look up a code for a specified speed in a conversion table; |
| 2483 | * used by drivers to map software speed values to hardware parameters. |
| 2484 | */ |
| 2485 | int |
| 2486 | ttspeedtab(int speed, const struct speedtab *table) |
| 2487 | { |
| 2488 | |
| 2489 | for (; table->sp_speed != -1; table++) |
| 2490 | if (table->sp_speed == speed) |
| 2491 | return (table->sp_code); |
| 2492 | return (-1); |
| 2493 | } |
| 2494 | |
| 2495 | /* |
| 2496 | * Set tty hi and low water marks. |
| 2497 | * |
| 2498 | * Try to arrange the dynamics so there's about one second |
| 2499 | * from hi to low water. |
| 2500 | */ |
| 2501 | void |
| 2502 | ttsetwater(struct tty *tp) |
| 2503 | { |
| 2504 | int cps, x; |
| 2505 | |
| 2506 | /* XXX not yet KASSERT(mutex_owned(&tty_lock)); */ |
| 2507 | |
| 2508 | #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) |
| 2509 | |
| 2510 | cps = tp->t_ospeed / 10; |
| 2511 | tp->t_lowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); |
| 2512 | x += cps; |
| 2513 | x = CLAMP(x, TTMAXHIWAT, TTMINHIWAT); |
| 2514 | tp->t_hiwat = roundup(x, TTROUND); |
| 2515 | #undef CLAMP |
| 2516 | } |
| 2517 | |
| 2518 | /* |
| 2519 | * Prepare report on state of foreground process group. |
| 2520 | * Call with proc_lock held. |
| 2521 | */ |
| 2522 | void |
| 2523 | ttygetinfo(struct tty *tp, int fromsig, char *buf, size_t bufsz) |
| 2524 | { |
| 2525 | struct lwp *l; |
| 2526 | struct proc *p, *pick = NULL; |
| 2527 | struct timeval utime, stime; |
| 2528 | int tmp; |
| 2529 | fixpt_t pctcpu = 0; |
| 2530 | const char *msg; |
| 2531 | char lmsg[100]; |
| 2532 | long ; |
| 2533 | |
| 2534 | KASSERT(mutex_owned(proc_lock)); |
| 2535 | |
| 2536 | *buf = '\0'; |
| 2537 | |
| 2538 | if (tp->t_session == NULL) |
| 2539 | msg = "not a controlling terminal\n" ; |
| 2540 | else if (tp->t_pgrp == NULL) |
| 2541 | msg = "no foreground process group\n" ; |
| 2542 | else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == NULL) |
| 2543 | msg = "empty foreground process group\n" ; |
| 2544 | else { |
| 2545 | /* Pick interesting process. */ |
| 2546 | for (; p != NULL; p = LIST_NEXT(p, p_pglist)) { |
| 2547 | struct proc *oldpick; |
| 2548 | |
| 2549 | if (pick == NULL) { |
| 2550 | pick = p; |
| 2551 | continue; |
| 2552 | } |
| 2553 | if (pick->p_lock < p->p_lock) { |
| 2554 | mutex_enter(pick->p_lock); |
| 2555 | mutex_enter(p->p_lock); |
| 2556 | } else if (pick->p_lock > p->p_lock) { |
| 2557 | mutex_enter(p->p_lock); |
| 2558 | mutex_enter(pick->p_lock); |
| 2559 | } else |
| 2560 | mutex_enter(p->p_lock); |
| 2561 | oldpick = pick; |
| 2562 | if (proc_compare_wrapper(pick, p)) |
| 2563 | pick = p; |
| 2564 | mutex_exit(p->p_lock); |
| 2565 | if (p->p_lock != oldpick->p_lock) |
| 2566 | mutex_exit(oldpick->p_lock); |
| 2567 | } |
| 2568 | if (fromsig && |
| 2569 | (SIGACTION_PS(pick->p_sigacts, SIGINFO).sa_flags & |
| 2570 | SA_NOKERNINFO)) |
| 2571 | return; |
| 2572 | msg = NULL; |
| 2573 | } |
| 2574 | |
| 2575 | /* Print load average. */ |
| 2576 | tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; |
| 2577 | snprintf(lmsg, sizeof(lmsg), "load: %d.%02d " , tmp / 100, tmp % 100); |
| 2578 | strlcat(buf, lmsg, bufsz); |
| 2579 | |
| 2580 | if (pick == NULL) { |
| 2581 | strlcat(buf, msg, bufsz); |
| 2582 | return; |
| 2583 | } |
| 2584 | |
| 2585 | snprintf(lmsg, sizeof(lmsg), " cmd: %s %d [" , pick->p_comm, |
| 2586 | pick->p_pid); |
| 2587 | strlcat(buf, lmsg, bufsz); |
| 2588 | |
| 2589 | mutex_enter(pick->p_lock); |
| 2590 | LIST_FOREACH(l, &pick->p_lwps, l_sibling) { |
| 2591 | const char *lp; |
| 2592 | lwp_lock(l); |
| 2593 | #ifdef LWP_PC |
| 2594 | #define FMT_RUN "%#"PRIxVADDR |
| 2595 | #define VAL_RUNNING (vaddr_t)LWP_PC(l) |
| 2596 | #define VAL_RUNABLE (vaddr_t)LWP_PC(l) |
| 2597 | #else |
| 2598 | #define FMT_RUN "%s" |
| 2599 | #define VAL_RUNNING "running" |
| 2600 | #define VAL_RUNABLE "runnable" |
| 2601 | #endif |
| 2602 | switch (l->l_stat) { |
| 2603 | case LSONPROC: |
| 2604 | snprintf(lmsg, sizeof(lmsg), FMT_RUN"/%d" , VAL_RUNNING, |
| 2605 | cpu_index(l->l_cpu)); |
| 2606 | lp = lmsg; |
| 2607 | break; |
| 2608 | case LSRUN: |
| 2609 | snprintf(lmsg, sizeof(lmsg), FMT_RUN, VAL_RUNABLE); |
| 2610 | lp = lmsg; |
| 2611 | break; |
| 2612 | default: |
| 2613 | lp = l->l_wchan ? l->l_wmesg : "iowait" ; |
| 2614 | break; |
| 2615 | } |
| 2616 | strlcat(buf, lp, bufsz); |
| 2617 | strlcat(buf, LIST_NEXT(l, l_sibling) != NULL ? " " : "] " , |
| 2618 | bufsz); |
| 2619 | pctcpu += l->l_pctcpu; |
| 2620 | lwp_unlock(l); |
| 2621 | } |
| 2622 | pctcpu += pick->p_pctcpu; |
| 2623 | calcru(pick, &utime, &stime, NULL, NULL); |
| 2624 | mutex_exit(pick->p_lock); |
| 2625 | |
| 2626 | /* Round up and print user+system time, %CPU and RSS. */ |
| 2627 | utime.tv_usec += 5000; |
| 2628 | if (utime.tv_usec >= 1000000) { |
| 2629 | utime.tv_sec += 1; |
| 2630 | utime.tv_usec -= 1000000; |
| 2631 | } |
| 2632 | stime.tv_usec += 5000; |
| 2633 | if (stime.tv_usec >= 1000000) { |
| 2634 | stime.tv_sec += 1; |
| 2635 | stime.tv_usec -= 1000000; |
| 2636 | } |
| 2637 | #define pgtok(a) (((u_long) ((a) * PAGE_SIZE) / 1024)) |
| 2638 | tmp = (pctcpu * 10000 + FSCALE / 2) >> FSHIFT; |
| 2639 | if (pick->p_stat == SIDL || P_ZOMBIE(pick)) |
| 2640 | rss = 0; |
| 2641 | else |
| 2642 | rss = pgtok(vm_resident_count(pick->p_vmspace)); |
| 2643 | |
| 2644 | snprintf(lmsg, sizeof(lmsg), "%ld.%02ldu %ld.%02lds %d%% %ldk" , |
| 2645 | (long)utime.tv_sec, (long)utime.tv_usec / 10000, |
| 2646 | (long)stime.tv_sec, (long)stime.tv_usec / 10000, |
| 2647 | tmp / 100, rss); |
| 2648 | strlcat(buf, lmsg, bufsz); |
| 2649 | } |
| 2650 | |
| 2651 | /* |
| 2652 | * Print report on state of foreground process group. |
| 2653 | * Call with tty_lock held. |
| 2654 | */ |
| 2655 | void |
| 2656 | ttyputinfo(struct tty *tp, char *buf) |
| 2657 | { |
| 2658 | |
| 2659 | KASSERT(mutex_owned(&tty_lock)); |
| 2660 | |
| 2661 | if (ttycheckoutq_wlock(tp, 0) == 0) |
| 2662 | return; |
| 2663 | ttyprintf_nolock(tp, "%s\n" , buf); |
| 2664 | tp->t_rocount = 0; /* so pending input will be retyped if BS */ |
| 2665 | } |
| 2666 | |
| 2667 | /* |
| 2668 | * Returns 1 if p2 has a better chance being the active foreground process |
| 2669 | * in a terminal instead of p1. |
| 2670 | */ |
| 2671 | static int |
| 2672 | proc_compare_wrapper(struct proc *p1, struct proc *p2) |
| 2673 | { |
| 2674 | lwp_t *l1, *l2; |
| 2675 | |
| 2676 | KASSERT(mutex_owned(p1->p_lock)); |
| 2677 | KASSERT(mutex_owned(p2->p_lock)); |
| 2678 | |
| 2679 | if ((l1 = LIST_FIRST(&p1->p_lwps)) == NULL) |
| 2680 | return 1; |
| 2681 | |
| 2682 | if ((l2 = LIST_FIRST(&p2->p_lwps)) == NULL) |
| 2683 | return 0; |
| 2684 | |
| 2685 | return proc_compare(p1, l1, p2, l2); |
| 2686 | } |
| 2687 | |
| 2688 | /* |
| 2689 | * Output char to tty; console putchar style. |
| 2690 | * Can be called with tty lock held through kprintf() machinery.. |
| 2691 | */ |
| 2692 | int |
| 2693 | tputchar(int c, int flags, struct tty *tp) |
| 2694 | { |
| 2695 | int r = 0; |
| 2696 | |
| 2697 | if ((flags & NOLOCK) == 0) |
| 2698 | mutex_spin_enter(&tty_lock); |
| 2699 | if (!CONNECTED(tp)) { |
| 2700 | r = -1; |
| 2701 | goto out; |
| 2702 | } |
| 2703 | if (c == '\n') |
| 2704 | (void)ttyoutput('\r', tp); |
| 2705 | (void)ttyoutput(c, tp); |
| 2706 | ttstart(tp); |
| 2707 | out: |
| 2708 | if ((flags & NOLOCK) == 0) |
| 2709 | mutex_spin_exit(&tty_lock); |
| 2710 | return (r); |
| 2711 | } |
| 2712 | |
| 2713 | /* |
| 2714 | * Sleep on chan, returning ERESTART if tty changed while we napped and |
| 2715 | * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by |
| 2716 | * cv_timedwait(_sig). |
| 2717 | * If the tty is revoked, restarting a pending call will redo validation done |
| 2718 | * at the start of the call. |
| 2719 | * |
| 2720 | * Must be called with the tty lock held. |
| 2721 | */ |
| 2722 | int |
| 2723 | ttysleep(struct tty *tp, kcondvar_t *cv, bool catch_p, int timo) |
| 2724 | { |
| 2725 | int error; |
| 2726 | short gen; |
| 2727 | |
| 2728 | KASSERT(mutex_owned(&tty_lock)); |
| 2729 | |
| 2730 | gen = tp->t_gen; |
| 2731 | if (cv == NULL) |
| 2732 | error = kpause("ttypause" , catch_p, timo, &tty_lock); |
| 2733 | else if (catch_p) |
| 2734 | error = cv_timedwait_sig(cv, &tty_lock, timo); |
| 2735 | else |
| 2736 | error = cv_timedwait(cv, &tty_lock, timo); |
| 2737 | if (error != 0) |
| 2738 | return (error); |
| 2739 | return (tp->t_gen == gen ? 0 : ERESTART); |
| 2740 | } |
| 2741 | |
| 2742 | int |
| 2743 | ttypause(struct tty *tp, int timo) |
| 2744 | { |
| 2745 | int error; |
| 2746 | |
| 2747 | error = ttysleep(tp, NULL, true, timo); |
| 2748 | if (error == EWOULDBLOCK) |
| 2749 | error = 0; |
| 2750 | return error; |
| 2751 | } |
| 2752 | |
| 2753 | /* |
| 2754 | * Attach a tty to the tty list. |
| 2755 | * |
| 2756 | * This should be called ONLY once per real tty (including pty's). |
| 2757 | * eg, on the sparc, the keyboard and mouse have struct tty's that are |
| 2758 | * distinctly NOT usable as tty's, and thus should not be attached to |
| 2759 | * the ttylist. This is why this call is not done from tty_alloc(). |
| 2760 | * |
| 2761 | * Device drivers should attach tty's at a similar time that they are |
| 2762 | * allocated, or, for the case of statically allocated struct tty's |
| 2763 | * either in the attach or (first) open routine. |
| 2764 | */ |
| 2765 | void |
| 2766 | tty_attach(struct tty *tp) |
| 2767 | { |
| 2768 | |
| 2769 | mutex_spin_enter(&tty_lock); |
| 2770 | TAILQ_INSERT_TAIL(&ttylist, tp, tty_link); |
| 2771 | ++tty_count; |
| 2772 | mutex_spin_exit(&tty_lock); |
| 2773 | } |
| 2774 | |
| 2775 | /* |
| 2776 | * Remove a tty from the tty list. |
| 2777 | */ |
| 2778 | void |
| 2779 | tty_detach(struct tty *tp) |
| 2780 | { |
| 2781 | |
| 2782 | mutex_spin_enter(&tty_lock); |
| 2783 | --tty_count; |
| 2784 | #ifdef DIAGNOSTIC |
| 2785 | if (tty_count < 0) |
| 2786 | panic("tty_detach: tty_count < 0" ); |
| 2787 | #endif |
| 2788 | TAILQ_REMOVE(&ttylist, tp, tty_link); |
| 2789 | mutex_spin_exit(&tty_lock); |
| 2790 | } |
| 2791 | |
| 2792 | /* |
| 2793 | * Allocate a tty structure and its associated buffers. |
| 2794 | */ |
| 2795 | struct tty * |
| 2796 | tty_alloc(void) |
| 2797 | { |
| 2798 | struct tty *tp; |
| 2799 | int i; |
| 2800 | |
| 2801 | tp = kmem_zalloc(sizeof(*tp), KM_SLEEP); |
| 2802 | callout_init(&tp->t_rstrt_ch, 0); |
| 2803 | callout_setfunc(&tp->t_rstrt_ch, ttrstrt, tp); |
| 2804 | tp->t_qsize = tty_qsize; |
| 2805 | clalloc(&tp->t_rawq, tp->t_qsize, 1); |
| 2806 | cv_init(&tp->t_rawcv, "ttyraw" ); |
| 2807 | cv_init(&tp->t_rawcvf, "ttyrawf" ); |
| 2808 | clalloc(&tp->t_canq, tp->t_qsize, 1); |
| 2809 | cv_init(&tp->t_cancv, "ttycan" ); |
| 2810 | cv_init(&tp->t_cancvf, "ttycanf" ); |
| 2811 | /* output queue doesn't need quoting */ |
| 2812 | clalloc(&tp->t_outq, tp->t_qsize, 0); |
| 2813 | cv_init(&tp->t_outcv, "ttyout" ); |
| 2814 | cv_init(&tp->t_outcvf, "ttyoutf" ); |
| 2815 | /* Set default line discipline. */ |
| 2816 | tp->t_linesw = ttyldisc_default(); |
| 2817 | tp->t_dev = NODEV; |
| 2818 | selinit(&tp->t_rsel); |
| 2819 | selinit(&tp->t_wsel); |
| 2820 | for (i = 0; i < TTYSIG_COUNT; i++) { |
| 2821 | sigemptyset(&tp->t_sigs[i]); |
| 2822 | } |
| 2823 | |
| 2824 | return tp; |
| 2825 | } |
| 2826 | |
| 2827 | /* |
| 2828 | * Free a tty structure and its buffers. |
| 2829 | * |
| 2830 | * Be sure to call tty_detach() for any tty that has been |
| 2831 | * tty_attach()ed. |
| 2832 | */ |
| 2833 | void |
| 2834 | tty_free(struct tty *tp) |
| 2835 | { |
| 2836 | int i; |
| 2837 | |
| 2838 | mutex_enter(proc_lock); |
| 2839 | mutex_enter(&tty_lock); |
| 2840 | for (i = 0; i < TTYSIG_COUNT; i++) |
| 2841 | sigemptyset(&tp->t_sigs[i]); |
| 2842 | if (tp->t_sigcount != 0) |
| 2843 | TAILQ_REMOVE(&tty_sigqueue, tp, t_sigqueue); |
| 2844 | mutex_exit(&tty_lock); |
| 2845 | mutex_exit(proc_lock); |
| 2846 | |
| 2847 | callout_halt(&tp->t_rstrt_ch, NULL); |
| 2848 | callout_destroy(&tp->t_rstrt_ch); |
| 2849 | ttyldisc_release(tp->t_linesw); |
| 2850 | clfree(&tp->t_rawq); |
| 2851 | clfree(&tp->t_canq); |
| 2852 | clfree(&tp->t_outq); |
| 2853 | cv_destroy(&tp->t_rawcv); |
| 2854 | cv_destroy(&tp->t_rawcvf); |
| 2855 | cv_destroy(&tp->t_cancv); |
| 2856 | cv_destroy(&tp->t_cancvf); |
| 2857 | cv_destroy(&tp->t_outcv); |
| 2858 | cv_destroy(&tp->t_outcvf); |
| 2859 | seldestroy(&tp->t_rsel); |
| 2860 | seldestroy(&tp->t_wsel); |
| 2861 | kmem_free(tp, sizeof(*tp)); |
| 2862 | } |
| 2863 | |
| 2864 | /* |
| 2865 | * ttyprintf_nolock: send a message to a specific tty, without locking. |
| 2866 | * |
| 2867 | * => should be used only by tty driver or anything that knows the |
| 2868 | * underlying tty will not be revoked(2)'d away. [otherwise, |
| 2869 | * use tprintf] |
| 2870 | */ |
| 2871 | static void |
| 2872 | ttyprintf_nolock(struct tty *tp, const char *fmt, ...) |
| 2873 | { |
| 2874 | va_list ap; |
| 2875 | |
| 2876 | /* No mutex needed; going to process TTY. */ |
| 2877 | va_start(ap, fmt); |
| 2878 | kprintf(fmt, TOTTY|NOLOCK, tp, NULL, ap); |
| 2879 | va_end(ap); |
| 2880 | } |
| 2881 | |
| 2882 | static int |
| 2883 | tty_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, |
| 2884 | void *arg0, void *arg1, void *arg2, void *arg3) |
| 2885 | { |
| 2886 | struct tty *tty; |
| 2887 | int result; |
| 2888 | |
| 2889 | result = KAUTH_RESULT_DEFER; |
| 2890 | |
| 2891 | if (action != KAUTH_DEVICE_TTY_OPEN) |
| 2892 | return result; |
| 2893 | |
| 2894 | tty = arg0; |
| 2895 | |
| 2896 | /* If it's not opened, we allow. */ |
| 2897 | if ((tty->t_state & TS_ISOPEN) == 0) |
| 2898 | result = KAUTH_RESULT_ALLOW; |
| 2899 | else { |
| 2900 | /* |
| 2901 | * If it's opened, we can only allow if it's not exclusively |
| 2902 | * opened; otherwise, that's a privileged operation and we |
| 2903 | * let the secmodel handle it. |
| 2904 | */ |
| 2905 | if ((tty->t_state & TS_XCLUDE) == 0) |
| 2906 | result = KAUTH_RESULT_ALLOW; |
| 2907 | } |
| 2908 | |
| 2909 | return result; |
| 2910 | } |
| 2911 | |
| 2912 | /* |
| 2913 | * Initialize the tty subsystem. |
| 2914 | */ |
| 2915 | void |
| 2916 | tty_init(void) |
| 2917 | { |
| 2918 | |
| 2919 | mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_VM); |
| 2920 | rw_init(&ttcompat_lock); |
| 2921 | tty_sigsih = softint_establish(SOFTINT_CLOCK, ttysigintr, NULL); |
| 2922 | KASSERT(tty_sigsih != NULL); |
| 2923 | |
| 2924 | tty_listener = kauth_listen_scope(KAUTH_SCOPE_DEVICE, |
| 2925 | tty_listener_cb, NULL); |
| 2926 | |
| 2927 | sysctl_kern_tty_setup(); |
| 2928 | } |
| 2929 | |
| 2930 | /* |
| 2931 | * Send a signal from a tty to its process group or session leader. |
| 2932 | * Handoff to the target is deferred to a soft interrupt. |
| 2933 | */ |
| 2934 | void |
| 2935 | ttysig(struct tty *tp, enum ttysigtype st, int sig) |
| 2936 | { |
| 2937 | sigset_t *sp; |
| 2938 | |
| 2939 | /* XXXSMP not yet KASSERT(mutex_owned(&tty_lock)); */ |
| 2940 | |
| 2941 | sp = &tp->t_sigs[st]; |
| 2942 | if (sigismember(sp, sig)) |
| 2943 | return; |
| 2944 | sigaddset(sp, sig); |
| 2945 | if (tp->t_sigcount++ == 0) |
| 2946 | TAILQ_INSERT_TAIL(&tty_sigqueue, tp, t_sigqueue); |
| 2947 | softint_schedule(tty_sigsih); |
| 2948 | } |
| 2949 | |
| 2950 | /* |
| 2951 | * Deliver deferred signals from ttys. Note that the process groups |
| 2952 | * and sessions associated with the ttys may have changed from when |
| 2953 | * the signal was originally sent, but in practice it should not matter. |
| 2954 | * For signals produced as a result of a syscall, the soft interrupt |
| 2955 | * will fire before the syscall returns to the user. |
| 2956 | */ |
| 2957 | static void |
| 2958 | ttysigintr(void *cookie) |
| 2959 | { |
| 2960 | struct tty *tp; |
| 2961 | enum ttysigtype st; |
| 2962 | struct pgrp *pgrp; |
| 2963 | struct session *sess; |
| 2964 | int sig, lflag; |
| 2965 | char infobuf[200]; |
| 2966 | |
| 2967 | mutex_enter(proc_lock); |
| 2968 | mutex_spin_enter(&tty_lock); |
| 2969 | while ((tp = TAILQ_FIRST(&tty_sigqueue)) != NULL) { |
| 2970 | KASSERT(tp->t_sigcount > 0); |
| 2971 | for (st = TTYSIG_PG1; st < TTYSIG_COUNT; st++) { |
| 2972 | if ((sig = firstsig(&tp->t_sigs[st])) != 0) |
| 2973 | break; |
| 2974 | } |
| 2975 | KASSERT(st < TTYSIG_COUNT); |
| 2976 | sigdelset(&tp->t_sigs[st], sig); |
| 2977 | if (--tp->t_sigcount == 0) |
| 2978 | TAILQ_REMOVE(&tty_sigqueue, tp, t_sigqueue); |
| 2979 | pgrp = tp->t_pgrp; |
| 2980 | sess = tp->t_session; |
| 2981 | lflag = tp->t_lflag; |
| 2982 | if (sig == SIGINFO) { |
| 2983 | if (ISSET(tp->t_state, TS_SIGINFO)) { |
| 2984 | /* Via ioctl: ignore tty option. */ |
| 2985 | tp->t_state &= ~TS_SIGINFO; |
| 2986 | lflag |= ISIG; |
| 2987 | } |
| 2988 | if (!ISSET(lflag, NOKERNINFO)) { |
| 2989 | mutex_spin_exit(&tty_lock); |
| 2990 | ttygetinfo(tp, 1, infobuf, sizeof(infobuf)); |
| 2991 | mutex_spin_enter(&tty_lock); |
| 2992 | ttyputinfo(tp, infobuf); |
| 2993 | } |
| 2994 | if (!ISSET(lflag, ISIG)) |
| 2995 | continue; |
| 2996 | } |
| 2997 | mutex_spin_exit(&tty_lock); |
| 2998 | KASSERT(sig != 0); |
| 2999 | switch (st) { |
| 3000 | case TTYSIG_PG1: |
| 3001 | if (pgrp != NULL) |
| 3002 | pgsignal(pgrp, sig, 1); |
| 3003 | break; |
| 3004 | case TTYSIG_PG2: |
| 3005 | if (pgrp != NULL) |
| 3006 | pgsignal(pgrp, sig, sess != NULL); |
| 3007 | break; |
| 3008 | case TTYSIG_LEADER: |
| 3009 | if (sess != NULL && sess->s_leader != NULL) |
| 3010 | psignal(sess->s_leader, sig); |
| 3011 | break; |
| 3012 | default: |
| 3013 | /* NOTREACHED */ |
| 3014 | break; |
| 3015 | } |
| 3016 | mutex_spin_enter(&tty_lock); |
| 3017 | } |
| 3018 | mutex_spin_exit(&tty_lock); |
| 3019 | mutex_exit(proc_lock); |
| 3020 | } |
| 3021 | |
| 3022 | unsigned char |
| 3023 | tty_getctrlchar(struct tty *tp, unsigned which) |
| 3024 | { |
| 3025 | KASSERT(which < NCCS); |
| 3026 | return tp->t_cc[which]; |
| 3027 | } |
| 3028 | |
| 3029 | void |
| 3030 | tty_setctrlchar(struct tty *tp, unsigned which, unsigned char val) |
| 3031 | { |
| 3032 | KASSERT(which < NCCS); |
| 3033 | tp->t_cc[which] = val; |
| 3034 | } |
| 3035 | |
| 3036 | int |
| 3037 | tty_try_xonxoff(struct tty *tp, unsigned char c) |
| 3038 | { |
| 3039 | const struct cdevsw *cdev; |
| 3040 | |
| 3041 | if (tp->t_iflag & IXON) { |
| 3042 | if (c == tp->t_cc[VSTOP] && tp->t_cc[VSTOP] != _POSIX_VDISABLE) { |
| 3043 | if ((tp->t_state & TS_TTSTOP) == 0) { |
| 3044 | tp->t_state |= TS_TTSTOP; |
| 3045 | cdev = cdevsw_lookup(tp->t_dev); |
| 3046 | if (cdev != NULL) |
| 3047 | (*cdev->d_stop)(tp, 0); |
| 3048 | } |
| 3049 | return 0; |
| 3050 | } |
| 3051 | if (c == tp->t_cc[VSTART] && tp->t_cc[VSTART] != _POSIX_VDISABLE) { |
| 3052 | tp->t_state &= ~TS_TTSTOP; |
| 3053 | if (tp->t_oproc != NULL) { |
| 3054 | mutex_spin_enter(&tty_lock); /* XXX */ |
| 3055 | (*tp->t_oproc)(tp); |
| 3056 | mutex_spin_exit(&tty_lock); /* XXX */ |
| 3057 | } |
| 3058 | return 0; |
| 3059 | } |
| 3060 | } |
| 3061 | return EAGAIN; |
| 3062 | } |
| 3063 | |