| 1 | #include <u.h> |
| 2 | #include <libc.h> |
| 3 | #include <ureg.h> |
| 4 | #include "dat.h" |
| 5 | #include "fns.h" |
| 6 | #include "linux.h" |
| 7 | |
| 8 | typedef struct Termios Termios; |
| 9 | typedef struct Winsize Winsize; |
| 10 | typedef struct Cbuf Cbuf; |
| 11 | typedef struct Tty Tty; |
| 12 | typedef struct Pty Pty; |
| 13 | typedef struct Ptyfile Ptyfile; |
| 14 | |
| 15 | /* cflags */ |
| 16 | enum { |
| 17 | IGNBRK = 01, |
| 18 | BRKINT = 02, |
| 19 | IGNPAR = 04, |
| 20 | PARMRK = 010, |
| 21 | INPCK = 020, |
| 22 | ISTRIP = 040, |
| 23 | INLCR = 0100, |
| 24 | IGNCR = 0200, |
| 25 | ICRNL = 0400, |
| 26 | IUCLC = 01000, |
| 27 | IXON = 02000, |
| 28 | IXANY = 04000, |
| 29 | IXOFF = 010000, |
| 30 | IMAXBEL = 020000, |
| 31 | IUTF8 = 040000, |
| 32 | }; |
| 33 | |
| 34 | /* oflags */ |
| 35 | enum { |
| 36 | OPOST = 01, |
| 37 | OLCUC = 02, |
| 38 | ONLCR = 04, |
| 39 | OCRNL = 010, |
| 40 | ONOCR = 020, |
| 41 | ONLRET = 040, |
| 42 | OFILL = 0100, |
| 43 | OFDEL = 0200, |
| 44 | NLDLY = 0400, |
| 45 | NL0 = 0, |
| 46 | NL1 = 0400, |
| 47 | CRDLY = 03000, |
| 48 | CR0 = 0, |
| 49 | CR1 = 01000, |
| 50 | CR2 = 02000, |
| 51 | CR3 = 03000, |
| 52 | TABDLY = 014000, |
| 53 | TAB0 = 0, |
| 54 | TAB1 = 04000, |
| 55 | TAB2 = 010000, |
| 56 | TAB3 = 014000, |
| 57 | XTABS = 014000, |
| 58 | BSDLY = 020000, |
| 59 | BS0 = 0, |
| 60 | BS1 = 020000, |
| 61 | VTDLY = 040000, |
| 62 | VT0 = 0, |
| 63 | VT1 = 040000, |
| 64 | FFDLY = 0100000, |
| 65 | FF0 = 0, |
| 66 | FF1 = 0100000, |
| 67 | }; |
| 68 | |
| 69 | /* cflags */ |
| 70 | enum { |
| 71 | CSIZE = 060, |
| 72 | CS5 = 0, |
| 73 | CS6 = 020, |
| 74 | CS7 = 040, |
| 75 | CS8 = 060, |
| 76 | CREAD = 0200, |
| 77 | CLOCAL = 04000, |
| 78 | HUPCL = 02000, |
| 79 | }; |
| 80 | |
| 81 | /* lflags */ |
| 82 | enum { |
| 83 | ISIG = 01, |
| 84 | ICANON = 02, |
| 85 | XCASE = 04, |
| 86 | ECHO = 010, |
| 87 | ECHOE = 020, |
| 88 | ECHOK = 040, |
| 89 | ECHONL = 0100, |
| 90 | NOFLSH = 0200, |
| 91 | TOSTOP = 0400, |
| 92 | ECHOCTL = 01000, |
| 93 | ECHOPRT = 02000, |
| 94 | ECHOKE = 04000, |
| 95 | FLUSH0 = 010000, |
| 96 | PENDIN = 040000, |
| 97 | IEXTEN = 0100000, |
| 98 | }; |
| 99 | |
| 100 | /* cc */ |
| 101 | enum { |
| 102 | VINTR = 0, |
| 103 | VQUIT, |
| 104 | VERASE, |
| 105 | VKILL, |
| 106 | VEOF, |
| 107 | VTIME, |
| 108 | VMIN, |
| 109 | VSWTCH, |
| 110 | VSTART, |
| 111 | VSTOP, |
| 112 | VSUSP, |
| 113 | VEOL, |
| 114 | VREPRINT, |
| 115 | VDISCARD, |
| 116 | VERASEW, |
| 117 | VLNEXT, |
| 118 | VEOL2, |
| 119 | NCCS, |
| 120 | }; |
| 121 | |
| 122 | struct Termios |
| 123 | { |
| 124 | int iflag; /* input modes */ |
| 125 | int oflag; /* output modes */ |
| 126 | int cflag; /* control modes */ |
| 127 | int lflag; /* local modes */ |
| 128 | uchar cline; |
| 129 | uchar cc[NCCS]; /* control characters */ |
| 130 | }; |
| 131 | |
| 132 | struct Winsize |
| 133 | { |
| 134 | ushort row; |
| 135 | ushort col; |
| 136 | ushort px; |
| 137 | ushort py; |
| 138 | }; |
| 139 | |
| 140 | struct Cbuf |
| 141 | { |
| 142 | int rp; |
| 143 | int wp; |
| 144 | char cb[256]; |
| 145 | }; |
| 146 | |
| 147 | struct Tty |
| 148 | { |
| 149 | Termios t; |
| 150 | Winsize winsize; |
| 151 | |
| 152 | int escaped; |
| 153 | int eol; |
| 154 | |
| 155 | int pgid; |
| 156 | |
| 157 | Cbuf wb; |
| 158 | Cbuf rb; |
| 159 | }; |
| 160 | |
| 161 | struct Pty |
| 162 | { |
| 163 | Tty; |
| 164 | |
| 165 | int id; |
| 166 | int closed; |
| 167 | int locked; |
| 168 | |
| 169 | struct { |
| 170 | Uwaitq r; |
| 171 | Uwaitq w; |
| 172 | } q[2]; |
| 173 | |
| 174 | Ref; |
| 175 | QLock; |
| 176 | }; |
| 177 | |
| 178 | struct Ptyfile |
| 179 | { |
| 180 | Ufile; |
| 181 | |
| 182 | Pty *pty; |
| 183 | |
| 184 | int master; |
| 185 | }; |
| 186 | |
| 187 | static Pty *ptys[64]; |
| 188 | |
| 189 | int cbput(Cbuf *b, char c) |
| 190 | { |
| 191 | int x; |
| 192 | x = b->wp+1&(sizeof(b->cb)-1); |
| 193 | if(x == b->rp) |
| 194 | return -1; |
| 195 | b->cb[b->wp] = c; |
| 196 | b->wp = x; |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | int cbget(Cbuf *b) |
| 201 | { |
| 202 | char c; |
| 203 | if(b->rp == b->wp) |
| 204 | return -1; |
| 205 | c = b->cb[b->rp]; |
| 206 | b->rp = (b->rp + 1) & (sizeof(b->cb)-1); |
| 207 | return c; |
| 208 | } |
| 209 | |
| 210 | int cbfill(Cbuf *b) |
| 211 | { |
| 212 | return (b->wp - b->rp) & (sizeof(b->cb)-1); |
| 213 | } |
| 214 | |
| 215 | void ttyinit(Tty *t) |
| 216 | { |
| 217 | memset(&t->t, 0, sizeof(t->t)); |
| 218 | |
| 219 | t->t.iflag = ICRNL; |
| 220 | t->t.oflag = OPOST|ONLCR|NL0|CR0|TAB0|BS0|VT0|FF0; |
| 221 | t->t.lflag = ICANON|IEXTEN|ECHO|ECHOE|ECHOK; |
| 222 | |
| 223 | if(current) |
| 224 | t->pgid = current->pgid; |
| 225 | } |
| 226 | |
| 227 | int ttywrite(Tty *t, char *buf, int len) |
| 228 | { |
| 229 | char *p, *e; |
| 230 | |
| 231 | for(p=buf, e=buf+len; p<e; p++){ |
| 232 | char c; |
| 233 | |
| 234 | c = *p; |
| 235 | if((t->t.oflag & OPOST) == 0) { |
| 236 | if(cbput(&t->wb, c) < 0) |
| 237 | break; |
| 238 | continue; |
| 239 | } |
| 240 | switch(c) { |
| 241 | case '\n': |
| 242 | if(t->t.oflag & ONLCR) { |
| 243 | if(cbput(&t->wb, '\r') < 0) |
| 244 | goto done; |
| 245 | } |
| 246 | if(cbput(&t->wb, c) < 0) |
| 247 | goto done; |
| 248 | break; |
| 249 | |
| 250 | case '\t': |
| 251 | if((t->t.oflag & TAB3) == TAB3) { |
| 252 | int tab; |
| 253 | |
| 254 | tab = 8; |
| 255 | while(tab--) |
| 256 | cbput(&t->wb, ' '); |
| 257 | break; |
| 258 | } |
| 259 | /* Fall Through */ |
| 260 | default: |
| 261 | if(t->t.oflag & OLCUC) |
| 262 | if(c >= 'a' && c <= 'z') |
| 263 | c = 'A' + (c-'a'); |
| 264 | if(cbput(&t->wb, c) < 0) |
| 265 | goto done; |
| 266 | } |
| 267 | } |
| 268 | done: |
| 269 | return p-buf; |
| 270 | } |
| 271 | |
| 272 | int ttycanread(Tty *t, int *n) |
| 273 | { |
| 274 | int x; |
| 275 | |
| 276 | x = cbfill(&t->rb); |
| 277 | if(t->t.lflag & ICANON){ |
| 278 | if(t->eol == 0) |
| 279 | return 0; |
| 280 | } else { |
| 281 | if(x == 0) |
| 282 | return 0; |
| 283 | } |
| 284 | if(n != nil) |
| 285 | *n = x; |
| 286 | return 1; |
| 287 | } |
| 288 | |
| 289 | int ttyread(Tty *t, char *buf, int len) |
| 290 | { |
| 291 | char *p, *e; |
| 292 | |
| 293 | if((t->t.lflag & ICANON) && t->eol == 0) |
| 294 | return 0; |
| 295 | |
| 296 | for(p=buf, e=buf+len; p<e; p++){ |
| 297 | int c; |
| 298 | |
| 299 | if((c = cbget(&t->rb)) < 0) |
| 300 | break; |
| 301 | |
| 302 | if(c==0 || c=='\n'){ |
| 303 | t->eol--; |
| 304 | if(t->t.lflag & ICANON){ |
| 305 | if(c == 0) |
| 306 | break; |
| 307 | *p++ = c; |
| 308 | break; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | *p = c; |
| 313 | } |
| 314 | return p-buf; |
| 315 | } |
| 316 | |
| 317 | |
| 318 | static void |
| 319 | echo(Tty *t, char c) |
| 320 | { |
| 321 | if(t->t.lflag & ECHO) { |
| 322 | switch(c) { |
| 323 | case '\r': |
| 324 | if(t->t.oflag & OCRNL) { |
| 325 | cbput(&t->wb, '\n'); |
| 326 | break; |
| 327 | } |
| 328 | cbput(&t->wb, c); |
| 329 | break; |
| 330 | case '\n': |
| 331 | if(t->t.oflag & ONLCR) |
| 332 | cbput(&t->wb, '\r'); |
| 333 | cbput(&t->wb, '\n'); |
| 334 | break; |
| 335 | case '\t': |
| 336 | if((t->t.oflag & TAB3) == TAB3) { |
| 337 | int tab; |
| 338 | |
| 339 | tab = 8; |
| 340 | while(tab--) |
| 341 | cbput(&t->wb, ' '); |
| 342 | break; |
| 343 | } |
| 344 | /* Fall Through */ |
| 345 | default: |
| 346 | cbput(&t->wb, c); |
| 347 | break; |
| 348 | } |
| 349 | } |
| 350 | else |
| 351 | if(c == '\n' && (t->t.lflag&(ECHONL|ICANON)) == (ECHONL|ICANON)) { |
| 352 | if(t->t.oflag & ONLCR) |
| 353 | cbput(&t->wb, '\r'); |
| 354 | cbput(&t->wb, '\n'); |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | static int |
| 359 | bs(Tty *t) |
| 360 | { |
| 361 | char c; |
| 362 | int x; |
| 363 | |
| 364 | if(cbfill(&t->rb) == 0) |
| 365 | return 0; |
| 366 | x = (t->rb.wp-1)&(sizeof(t->rb.cb)-1); |
| 367 | c = t->rb.cb[x]; |
| 368 | if(c == 0 || c == '\n') |
| 369 | return 0; |
| 370 | t->rb.wp = x; |
| 371 | echo(t, '\b'); |
| 372 | if(t->t.lflag & ECHOE) { |
| 373 | echo(t, ' '); |
| 374 | echo(t, '\b'); |
| 375 | } |
| 376 | return 1; |
| 377 | } |
| 378 | |
| 379 | int ttywriteinput(Tty *t, char *buf, int len) |
| 380 | { |
| 381 | char *p, *e; |
| 382 | |
| 383 | for(p=buf, e=buf+len; p<e; p++){ |
| 384 | char c; |
| 385 | |
| 386 | c = *p; |
| 387 | |
| 388 | if(t->t.iflag & ISTRIP) |
| 389 | c &= 0177; |
| 390 | |
| 391 | if((t->t.iflag & IXON) && c == t->t.cc[VSTOP]) { |
| 392 | p++; |
| 393 | break; |
| 394 | } |
| 395 | |
| 396 | switch(c) { |
| 397 | case '\r': |
| 398 | if(t->t.iflag & IGNCR) |
| 399 | continue; |
| 400 | if(t->t.iflag & ICRNL) |
| 401 | c = '\n'; |
| 402 | break; |
| 403 | case '\n': |
| 404 | if(t->t.iflag&INLCR) |
| 405 | c = '\r'; |
| 406 | break; |
| 407 | } |
| 408 | |
| 409 | if(t->t.lflag & ISIG) { |
| 410 | if(c == t->t.cc[VINTR]){ |
| 411 | if(t->pgid > 0) |
| 412 | sys_kill(-t->pgid, SIGINT); |
| 413 | continue; |
| 414 | } |
| 415 | if(c == t->t.cc[VQUIT]){ |
| 416 | if(t->pgid > 0) |
| 417 | sys_kill(-t->pgid, SIGQUIT); |
| 418 | continue; |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | if((t->t.lflag & ICANON) && t->escaped == 0) { |
| 423 | if(c == t->t.cc[VERASE]) { |
| 424 | bs(t); |
| 425 | continue; |
| 426 | } |
| 427 | if(c == t->t.cc[VKILL]) { |
| 428 | while(bs(t)) |
| 429 | ; |
| 430 | if(t->t.lflag & ECHOK) |
| 431 | echo(t, '\n'); |
| 432 | continue; |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | if(t->escaped == 0 && (c == t->t.cc[VEOF] || c == '\n')) |
| 437 | t->eol++; |
| 438 | |
| 439 | if((t->t.lflag & ICANON) == 0) { |
| 440 | echo(t, c); |
| 441 | cbput(&t->rb, c); |
| 442 | continue; |
| 443 | } |
| 444 | |
| 445 | if(t->escaped) |
| 446 | echo(t, '\b'); |
| 447 | |
| 448 | if(c != t->t.cc[VEOF]) |
| 449 | echo(t, c); |
| 450 | |
| 451 | if(c != '\\') { |
| 452 | if(c == t->t.cc[VEOF]) |
| 453 | c = 0; |
| 454 | cbput(&t->rb, c); |
| 455 | t->escaped = 0; |
| 456 | continue; |
| 457 | } |
| 458 | if(t->escaped) { |
| 459 | cbput(&t->rb, '\\'); |
| 460 | t->escaped = 0; |
| 461 | } |
| 462 | else |
| 463 | t->escaped = 1; |
| 464 | } |
| 465 | |
| 466 | return p-buf; |
| 467 | } |
| 468 | |
| 469 | int ttycanreadoutput(Tty *t, int *n) |
| 470 | { |
| 471 | int x; |
| 472 | |
| 473 | x = cbfill(&t->wb); |
| 474 | if(n != nil) |
| 475 | *n = x; |
| 476 | return x > 0 ? 1 : 0; |
| 477 | } |
| 478 | |
| 479 | int ttyreadoutput(Tty *t, char *buf, int len) |
| 480 | { |
| 481 | char *p, *e; |
| 482 | |
| 483 | for(p=buf, e=buf+len; p<e; p++){ |
| 484 | int c; |
| 485 | |
| 486 | if((c = cbget(&t->wb)) < 0) |
| 487 | break; |
| 488 | *p = c; |
| 489 | } |
| 490 | return p-buf; |
| 491 | } |
| 492 | |
| 493 | static int |
| 494 | pollpty(Ufile *f, void *tab) |
| 495 | { |
| 496 | Ptyfile *p = (Ptyfile*)f; |
| 497 | int err; |
| 498 | int n; |
| 499 | |
| 500 | if(p->pty == nil) |
| 501 | return 0; |
| 502 | |
| 503 | qlock(p->pty); |
| 504 | if(p->master){ |
| 505 | pollwait(p, &p->pty->q[1].r, tab); |
| 506 | n = ttycanreadoutput(p->pty, nil); |
| 507 | } else { |
| 508 | pollwait(p, &p->pty->q[0].r, tab); |
| 509 | n = ttycanread(p->pty, nil); |
| 510 | } |
| 511 | err = POLLOUT; |
| 512 | if(n){ |
| 513 | err |= POLLIN; |
| 514 | } else if(p->master==0 && p->pty->closed){ |
| 515 | err |= (POLLIN | POLLHUP); |
| 516 | } |
| 517 | qunlock(p->pty); |
| 518 | |
| 519 | return err; |
| 520 | } |
| 521 | |
| 522 | static int |
| 523 | readpty(Ufile *f, void *data, int len, vlong) |
| 524 | { |
| 525 | int err; |
| 526 | Ptyfile *p = (Ptyfile*)f; |
| 527 | |
| 528 | if(p->pty == nil) |
| 529 | return -EPERM; |
| 530 | qlock(p->pty); |
| 531 | for(;;){ |
| 532 | if(p->master){ |
| 533 | err = ttycanreadoutput(p->pty, nil); |
| 534 | } else { |
| 535 | err = ttycanread(p->pty, nil); |
| 536 | } |
| 537 | if(err > 0){ |
| 538 | if(p->master){ |
| 539 | err = ttyreadoutput(p->pty, (char*)data, len); |
| 540 | }else{ |
| 541 | err = ttyread(p->pty, (char*)data, len); |
| 542 | } |
| 543 | } else { |
| 544 | if(p->master == 0 && p->pty->closed){ |
| 545 | err = -EIO; |
| 546 | } else if(p->mode & O_NONBLOCK){ |
| 547 | err = -EAGAIN; |
| 548 | } else { |
| 549 | if((err = sleepq(&p->pty->q[p->master].r, p->pty, 1)) == 0) |
| 550 | continue; |
| 551 | } |
| 552 | } |
| 553 | wakeq(&p->pty->q[!p->master].w, MAXPROC); |
| 554 | break; |
| 555 | } |
| 556 | qunlock(p->pty); |
| 557 | |
| 558 | return err; |
| 559 | } |
| 560 | |
| 561 | static int |
| 562 | writepty(Ufile *f, void *data, int len, vlong) |
| 563 | { |
| 564 | Ptyfile *p = (Ptyfile*)f; |
| 565 | int err; |
| 566 | |
| 567 | if(p->pty == nil) |
| 568 | return -EPERM; |
| 569 | if(len == 0) |
| 570 | return len; |
| 571 | |
| 572 | qlock(p->pty); |
| 573 | for(;;){ |
| 574 | if(p->pty->closed){ |
| 575 | err = -EIO; |
| 576 | break; |
| 577 | } |
| 578 | if(p->master){ |
| 579 | err = ttywriteinput(p->pty, (char*)data, len); |
| 580 | } else{ |
| 581 | err = ttywrite(p->pty, (char*)data, len); |
| 582 | } |
| 583 | if(err == 0){ |
| 584 | if((err = sleepq(&p->pty->q[p->master].w, p->pty, 1)) == 0) |
| 585 | continue; |
| 586 | } else { |
| 587 | if(ttycanread(p->pty, nil)) |
| 588 | wakeq(&p->pty->q[0].r, MAXPROC); |
| 589 | if(ttycanreadoutput(p->pty, nil)) |
| 590 | wakeq(&p->pty->q[1].r, MAXPROC); |
| 591 | } |
| 592 | break; |
| 593 | } |
| 594 | qunlock(p->pty); |
| 595 | |
| 596 | return err; |
| 597 | } |
| 598 | |
| 599 | static int |
| 600 | closepty(Ufile *f) |
| 601 | { |
| 602 | Ptyfile *p = (Ptyfile*)f; |
| 603 | |
| 604 | if(p->pty == nil) |
| 605 | return 0; |
| 606 | |
| 607 | qlock(p->pty); |
| 608 | if(p->master) |
| 609 | p->pty->closed = 1; |
| 610 | if(!decref(p->pty)){ |
| 611 | ptys[p->pty->id] = nil; |
| 612 | qunlock(p->pty); |
| 613 | free(p->pty); |
| 614 | } else { |
| 615 | wakeq(&p->pty->q[0].r, MAXPROC); |
| 616 | wakeq(&p->pty->q[0].w, MAXPROC); |
| 617 | wakeq(&p->pty->q[1].r, MAXPROC); |
| 618 | wakeq(&p->pty->q[1].w, MAXPROC); |
| 619 | qunlock(p->pty); |
| 620 | } |
| 621 | return 0; |
| 622 | } |
| 623 | |
| 624 | static int |
| 625 | changetty(Ptyfile *tty) |
| 626 | { |
| 627 | Ufile *old; |
| 628 | |
| 629 | if(old = gettty()){ |
| 630 | putfile(old); |
| 631 | return (old == tty) ? 0 : -EPERM; |
| 632 | } |
| 633 | tty->pty->pgid = current->pgid; |
| 634 | settty(tty); |
| 635 | return 0; |
| 636 | } |
| 637 | |
| 638 | static int |
| 639 | ioctlpty(Ufile *f, int cmd, void *arg) |
| 640 | { |
| 641 | Ptyfile *p = (Ptyfile*)f; |
| 642 | int err, pid; |
| 643 | |
| 644 | if(p->pty == nil) |
| 645 | return -ENOTTY; |
| 646 | |
| 647 | trace("ioctlpty(%s, %lux, %p)", p->path, (ulong)cmd, arg); |
| 648 | |
| 649 | err = 0; |
| 650 | qlock(p->pty); |
| 651 | switch(cmd){ |
| 652 | default: |
| 653 | trace("ioctlpty: unknown: 0x%x", cmd); |
| 654 | err = -ENOTTY; |
| 655 | break; |
| 656 | |
| 657 | case 0x5401: /* TCGETS */ |
| 658 | memmove(arg, &p->pty->t, sizeof(Termios)); |
| 659 | break; |
| 660 | |
| 661 | case 0x5402: /* TCSETS */ |
| 662 | case 0x5403: /* TCSETSW */ |
| 663 | case 0x5404: /* TCSETSF */ |
| 664 | memmove(&p->pty->t, arg, sizeof(Termios)); |
| 665 | break; |
| 666 | |
| 667 | case 0x5422: // TIOCNOTTY |
| 668 | if((f = gettty()) && (f != p)){ |
| 669 | putfile(f); |
| 670 | err = -ENOTTY; |
| 671 | break; |
| 672 | } |
| 673 | settty(nil); |
| 674 | break; |
| 675 | |
| 676 | case 0x540E: // TIOCSCTTY |
| 677 | err = changetty(p); |
| 678 | break; |
| 679 | |
| 680 | case 0x540F: // TIOCGPGRP |
| 681 | *(int*)arg = p->pty->pgid; |
| 682 | break; |
| 683 | |
| 684 | case 0x5410: // TIOCSPGRP |
| 685 | p->pty->pgid = *(int*)arg; |
| 686 | break; |
| 687 | |
| 688 | case 0x5413: // TIOCGWINSZ |
| 689 | memmove(arg, &p->pty->winsize, sizeof(Winsize)); |
| 690 | break; |
| 691 | |
| 692 | case 0x5414: // TIOCSWINSZ |
| 693 | if(memcmp(&p->pty->winsize, arg, sizeof(Winsize)) == 0) |
| 694 | break; |
| 695 | memmove(&p->pty->winsize, arg, sizeof(Winsize)); |
| 696 | if((pid = p->pty->pgid) > 0){ |
| 697 | qunlock(p->pty); |
| 698 | |
| 699 | sys_kill(-pid, SIGWINCH); |
| 700 | return 0; |
| 701 | } |
| 702 | break; |
| 703 | case 0x40045431: // TIOCSPTLCK |
| 704 | if(p->master) |
| 705 | p->pty->locked = *(int*)arg; |
| 706 | break; |
| 707 | |
| 708 | case 0x80045430: |
| 709 | *(int*)arg = p->pty->id; |
| 710 | break; |
| 711 | |
| 712 | case 0x541B: |
| 713 | if(arg == nil) |
| 714 | break; |
| 715 | if(p->master){ |
| 716 | ttycanreadoutput(p->pty, &err); |
| 717 | } else { |
| 718 | ttycanread(p->pty, &err); |
| 719 | } |
| 720 | if(err < 0){ |
| 721 | *((int*)arg) = 0; |
| 722 | break; |
| 723 | } |
| 724 | *((int*)arg) = err; |
| 725 | err = 0; |
| 726 | break; |
| 727 | } |
| 728 | qunlock(p->pty); |
| 729 | |
| 730 | return err; |
| 731 | } |
| 732 | |
| 733 | static int |
| 734 | openpty(char *path, int mode, int perm, Ufile **pf) |
| 735 | { |
| 736 | Pty *pty; |
| 737 | Ptyfile *p; |
| 738 | int id; |
| 739 | int master; |
| 740 | |
| 741 | USED(perm); |
| 742 | |
| 743 | if(strcmp("/dev/tty", path)==0){ |
| 744 | if(*pf = gettty()) |
| 745 | return 0; |
| 746 | return -ENOTTY; |
| 747 | } else if(strcmp("/dev/pts", path)==0){ |
| 748 | pty = nil; |
| 749 | master = -1; |
| 750 | } else if(strcmp("/dev/ptmx", path)==0){ |
| 751 | master = 1; |
| 752 | for(id=0; id<nelem(ptys); id++){ |
| 753 | if(ptys[id] == nil) |
| 754 | break; |
| 755 | } |
| 756 | if(id == nelem(ptys)) |
| 757 | return -EBUSY; |
| 758 | |
| 759 | pty = kmallocz(sizeof(*pty), 1); |
| 760 | pty->ref = 1; |
| 761 | |
| 762 | ttyinit(pty); |
| 763 | |
| 764 | ptys[pty->id = id] = pty; |
| 765 | } else { |
| 766 | master = 0; |
| 767 | if(strncmp("/dev/pts/", path, 9) != 0) |
| 768 | return -ENOENT; |
| 769 | id = atoi(path + 9); |
| 770 | if(id < 0 || id >= nelem(ptys)) |
| 771 | return -ENOENT; |
| 772 | if((pty = ptys[id]) == nil) |
| 773 | return -ENOENT; |
| 774 | |
| 775 | qlock(pty); |
| 776 | if(pty->closed || pty->locked){ |
| 777 | qunlock(pty); |
| 778 | return -EIO; |
| 779 | } |
| 780 | incref(pty); |
| 781 | qunlock(pty); |
| 782 | } |
| 783 | |
| 784 | p = kmallocz(sizeof(*p), 1); |
| 785 | p->dev = PTYDEV; |
| 786 | p->ref = 1; |
| 787 | p->fd = -1; |
| 788 | p->mode = mode; |
| 789 | p->path = kstrdup(path); |
| 790 | p->pty = pty; |
| 791 | p->master = master; |
| 792 | |
| 793 | if(!master && !(mode & O_NOCTTY)) |
| 794 | changetty(p); |
| 795 | |
| 796 | *pf = p; |
| 797 | |
| 798 | return 0; |
| 799 | } |
| 800 | |
| 801 | static int |
| 802 | readdirpty(Ufile *f, Udirent **pd) |
| 803 | { |
| 804 | Ptyfile *p = (Ptyfile*)f; |
| 805 | int i, n; |
| 806 | |
| 807 | *pd = nil; |
| 808 | if(p->pty != nil) |
| 809 | return -EPERM; |
| 810 | n = 0; |
| 811 | for(i=0; i<nelem(ptys); i++){ |
| 812 | char buf[12]; |
| 813 | |
| 814 | if(ptys[i] == nil) |
| 815 | continue; |
| 816 | snprint(buf, sizeof(buf), "%d", i); |
| 817 | if((*pd = newdirent(f->path, buf, S_IFCHR | 0666)) == nil) |
| 818 | break; |
| 819 | pd = &((*pd)->next); |
| 820 | n++; |
| 821 | } |
| 822 | return n; |
| 823 | } |
| 824 | |
| 825 | static int |
| 826 | fstatpty(Ufile *f, Ustat *s) |
| 827 | { |
| 828 | Ptyfile *p = (Ptyfile*)f; |
| 829 | |
| 830 | if(p->pty != nil){ |
| 831 | s->mode = 0666 | S_IFCHR; |
| 832 | if(p->master){ |
| 833 | s->rdev = 5<<8 | 2; |
| 834 | } else { |
| 835 | s->rdev = 3<<8; |
| 836 | } |
| 837 | } else { |
| 838 | s->mode = 0777 | S_IFDIR; |
| 839 | s->rdev = 0; |
| 840 | } |
| 841 | s->ino = hashpath(p->path); |
| 842 | s->dev = 0; |
| 843 | s->uid = current->uid; |
| 844 | s->gid = current->gid; |
| 845 | s->size = 0; |
| 846 | s->atime = s->mtime = s->ctime = boottime/1000000000LL; |
| 847 | return 0; |
| 848 | }; |
| 849 | |
| 850 | static int |
| 851 | statpty(char *path, int, Ustat *s) |
| 852 | { |
| 853 | if(strcmp("/dev/tty", path)==0){ |
| 854 | s->mode = 0666 | S_IFCHR; |
| 855 | } else if(strcmp("/dev/ptmx", path)==0){ |
| 856 | s->mode = 0666 | S_IFCHR; |
| 857 | s->rdev = 5<<8 | 2; |
| 858 | } else if(strcmp("/dev/pts", path)==0){ |
| 859 | s->mode = 0777 | S_IFDIR; |
| 860 | } else if(strncmp("/dev/pts/", path, 9)==0){ |
| 861 | int id; |
| 862 | |
| 863 | id = atoi(path + 9); |
| 864 | if(id < 0 || id >= nelem(ptys)) |
| 865 | return -ENOENT; |
| 866 | if(ptys[id] == nil) |
| 867 | return -ENOENT; |
| 868 | |
| 869 | s->mode = 0666 | S_IFCHR; |
| 870 | s->rdev = 3<<8; |
| 871 | } else { |
| 872 | return -ENOENT; |
| 873 | } |
| 874 | s->ino = hashpath(path); |
| 875 | s->uid = current->uid; |
| 876 | s->gid = current->gid; |
| 877 | s->size = 0; |
| 878 | s->atime = s->mtime = s->ctime = boottime/1000000000LL; |
| 879 | return 0; |
| 880 | } |
| 881 | |
| 882 | static int |
| 883 | chmodpty(char *path, int mode) |
| 884 | { |
| 885 | USED(path); |
| 886 | USED(mode); |
| 887 | |
| 888 | return 0; |
| 889 | } |
| 890 | |
| 891 | static int |
| 892 | chownpty(char *path, int uid, int gid, int link) |
| 893 | { |
| 894 | USED(path); |
| 895 | USED(uid); |
| 896 | USED(gid); |
| 897 | USED(link); |
| 898 | |
| 899 | return 0; |
| 900 | } |
| 901 | |
| 902 | static int |
| 903 | fchmodpty(Ufile *f, int mode) |
| 904 | { |
| 905 | USED(f); |
| 906 | USED(mode); |
| 907 | |
| 908 | return 0; |
| 909 | } |
| 910 | |
| 911 | static int |
| 912 | fchownpty(Ufile *f, int uid, int gid) |
| 913 | { |
| 914 | USED(f); |
| 915 | USED(uid); |
| 916 | USED(gid); |
| 917 | |
| 918 | return 0; |
| 919 | } |
| 920 | |
| 921 | static Udev ptydev = |
| 922 | { |
| 923 | .open = openpty, |
| 924 | .read = readpty, |
| 925 | .write = writepty, |
| 926 | .poll = pollpty, |
| 927 | .close = closepty, |
| 928 | .readdir = readdirpty, |
| 929 | .ioctl = ioctlpty, |
| 930 | .fstat = fstatpty, |
| 931 | .stat = statpty, |
| 932 | .fchmod = fchmodpty, |
| 933 | .fchown = fchownpty, |
| 934 | .chmod = chmodpty, |
| 935 | .chown = chownpty, |
| 936 | }; |
| 937 | |
| 938 | void ptydevinit(void) |
| 939 | { |
| 940 | devtab[PTYDEV] = &ptydev; |
| 941 | fsmount(&ptydev, "/dev/pts"); |
| 942 | fsmount(&ptydev, "/dev/ptmx"); |
| 943 | fsmount(&ptydev, "/dev/tty"); |
| 944 | } |