| 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 Fd Fd; |
| 9 | typedef struct Fdtab Fdtab; |
| 10 | |
| 11 | struct Fd |
| 12 | { |
| 13 | int flags; |
| 14 | Ufile *file; |
| 15 | }; |
| 16 | |
| 17 | struct Fdtab |
| 18 | { |
| 19 | Ref; |
| 20 | QLock; |
| 21 | int lastfd; |
| 22 | int nfd; |
| 23 | Fd *fd; |
| 24 | }; |
| 25 | |
| 26 | Ufile* |
| 27 | getfile(Ufile *file) |
| 28 | { |
| 29 | if(file) |
| 30 | incref(file); |
| 31 | return file; |
| 32 | } |
| 33 | |
| 34 | void |
| 35 | putfile(Ufile *file) |
| 36 | { |
| 37 | Udirent *d; |
| 38 | |
| 39 | if(file == nil) |
| 40 | return; |
| 41 | if(decref(file)) |
| 42 | return; |
| 43 | trace("putfile(): closing %p %s", file, file->path); |
| 44 | if(devtab[file->dev]->close) |
| 45 | devtab[file->dev]->close(file); |
| 46 | free(file->path); |
| 47 | while(d = file->rdaux){ |
| 48 | file->rdaux = d->next; |
| 49 | free(d); |
| 50 | } |
| 51 | free(file); |
| 52 | } |
| 53 | |
| 54 | static Fdtab* |
| 55 | newfdtab(void) |
| 56 | { |
| 57 | Fdtab *tab; |
| 58 | |
| 59 | tab = kmallocz(sizeof(*tab), 1); |
| 60 | tab->ref = 1; |
| 61 | tab->lastfd = -1; |
| 62 | tab->nfd = 0; |
| 63 | tab->fd = nil; |
| 64 | |
| 65 | return tab; |
| 66 | } |
| 67 | |
| 68 | enum { |
| 69 | CHUNK = 64, |
| 70 | }; |
| 71 | |
| 72 | /* assumes tab->lock aquired */ |
| 73 | static int |
| 74 | grow1(Fdtab *tab) |
| 75 | { |
| 76 | if(tab->nfd >= MAXFD) |
| 77 | return -EMFILE; |
| 78 | if((tab->nfd % CHUNK) == 0) |
| 79 | tab->fd = krealloc(tab->fd, sizeof(tab->fd[0]) * (tab->nfd + CHUNK)); |
| 80 | memset(&tab->fd[tab->nfd], 0, sizeof(tab->fd[0])); |
| 81 | return tab->nfd++; |
| 82 | } |
| 83 | |
| 84 | Ufile *procfdgetfile(Uproc *proc, int fd) |
| 85 | { |
| 86 | Fdtab *tab; |
| 87 | Ufile *file; |
| 88 | |
| 89 | file = nil; |
| 90 | if(tab = proc->fdtab){ |
| 91 | qlock(tab); |
| 92 | if(fd >= 0 && fd < tab->nfd) |
| 93 | file = getfile(tab->fd[fd].file); |
| 94 | qunlock(tab); |
| 95 | } |
| 96 | return file; |
| 97 | } |
| 98 | |
| 99 | Ufile* |
| 100 | fdgetfile(int fd) |
| 101 | { |
| 102 | return procfdgetfile(current, fd); |
| 103 | } |
| 104 | |
| 105 | int |
| 106 | newfd(Ufile *file, int flags) |
| 107 | { |
| 108 | int fd; |
| 109 | Fdtab *tab; |
| 110 | |
| 111 | tab = current->fdtab; |
| 112 | qlock(tab); |
| 113 | fd = tab->lastfd; |
| 114 | if((fd >= 0) && (fd < tab->nfd) && (tab->fd[fd].file == nil)) |
| 115 | goto found; |
| 116 | for(fd=0; fd<tab->nfd; fd++) |
| 117 | if(tab->fd[fd].file == nil) |
| 118 | goto found; |
| 119 | fd = grow1(tab); |
| 120 | found: |
| 121 | if(fd >= 0){ |
| 122 | tab->fd[fd].file = file; |
| 123 | tab->fd[fd].flags = flags; |
| 124 | file = nil; |
| 125 | } |
| 126 | qunlock(tab); |
| 127 | putfile(file); |
| 128 | |
| 129 | return fd; |
| 130 | } |
| 131 | |
| 132 | static Fdtab* |
| 133 | getfdtab(Fdtab *tab, int copy) |
| 134 | { |
| 135 | Fdtab *new; |
| 136 | int i; |
| 137 | |
| 138 | if(!copy){ |
| 139 | incref(tab); |
| 140 | return tab; |
| 141 | } |
| 142 | qlock(tab); |
| 143 | new = newfdtab(); |
| 144 | new->lastfd = tab->lastfd; |
| 145 | new->nfd = tab->nfd; |
| 146 | new->fd = kmallocz(sizeof(new->fd[0]) * (((tab->nfd+CHUNK-1)/CHUNK)*CHUNK), 1); |
| 147 | for(i=0; i<new->nfd; i++){ |
| 148 | Ufile *file; |
| 149 | |
| 150 | if((file = tab->fd[i].file) == nil) |
| 151 | continue; |
| 152 | incref(file); |
| 153 | new->fd[i].file = file; |
| 154 | new->fd[i].flags = tab->fd[i].flags; |
| 155 | } |
| 156 | qunlock(tab); |
| 157 | return new; |
| 158 | } |
| 159 | |
| 160 | static void |
| 161 | putfdtab(Fdtab *tab) |
| 162 | { |
| 163 | int i; |
| 164 | |
| 165 | if(decref(tab)) |
| 166 | return; |
| 167 | for(i=0; i<tab->nfd; i++){ |
| 168 | Ufile *file; |
| 169 | if((file = tab->fd[i].file) == nil) |
| 170 | continue; |
| 171 | tab->fd[i].file = nil; |
| 172 | putfile(file); |
| 173 | } |
| 174 | free(tab->fd); |
| 175 | free(tab); |
| 176 | } |
| 177 | |
| 178 | int sys_dup2(int old, int new) |
| 179 | { |
| 180 | Ufile *file; |
| 181 | Fdtab *tab; |
| 182 | int err; |
| 183 | |
| 184 | trace("sys_dup2(%d, %d)", old, new); |
| 185 | |
| 186 | tab = current->fdtab; |
| 187 | |
| 188 | if((file = fdgetfile(old)) == nil) |
| 189 | return -EBADF; |
| 190 | if(new < 0) |
| 191 | return newfd(file, 0); |
| 192 | if(new >= MAXFD) |
| 193 | return -EBADF; |
| 194 | qlock(tab); |
| 195 | while(new >= tab->nfd){ |
| 196 | err = grow1(tab); |
| 197 | if(err < 0){ |
| 198 | qunlock(tab); |
| 199 | putfile(file); |
| 200 | return err; |
| 201 | } |
| 202 | } |
| 203 | if(tab->fd[new].file != nil) |
| 204 | putfile(tab->fd[new].file); |
| 205 | tab->fd[new].file = file; |
| 206 | tab->fd[new].flags &= ~FD_CLOEXEC; |
| 207 | qunlock(tab); |
| 208 | |
| 209 | return new; |
| 210 | } |
| 211 | |
| 212 | int sys_dup(int fd) |
| 213 | { |
| 214 | return sys_dup2(fd, -1); |
| 215 | } |
| 216 | |
| 217 | struct linux_flock |
| 218 | { |
| 219 | short l_type; |
| 220 | short l_whence; |
| 221 | ulong l_start; |
| 222 | ulong l_len; |
| 223 | int l_pid; |
| 224 | }; |
| 225 | |
| 226 | struct linux_flock64 |
| 227 | { |
| 228 | short l_type; |
| 229 | short l_whence; |
| 230 | uvlong l_start; |
| 231 | uvlong l_len; |
| 232 | int l_pid; |
| 233 | }; |
| 234 | |
| 235 | enum { |
| 236 | F_RDLCK, |
| 237 | F_WRLCK, |
| 238 | F_UNLCK, |
| 239 | }; |
| 240 | |
| 241 | int sys_fcntl(int fd, int cmd, int arg) |
| 242 | { |
| 243 | int ret; |
| 244 | Ufile *file; |
| 245 | Fdtab *tab; |
| 246 | |
| 247 | trace("sys_fcntl(%d, %lux, %lux)", fd, (ulong)cmd, (ulong)arg); |
| 248 | |
| 249 | tab = current->fdtab; |
| 250 | |
| 251 | ret = -EBADF; |
| 252 | if((file = fdgetfile(fd)) == nil) |
| 253 | goto out; |
| 254 | ret = -EINVAL; |
| 255 | switch(cmd){ |
| 256 | default: |
| 257 | trace("sys_fcntl() cmd %lux not implemented", (ulong)cmd); |
| 258 | break; |
| 259 | |
| 260 | case F_DUPFD: |
| 261 | if(arg < 0 || arg >= MAXFD) |
| 262 | break; |
| 263 | qlock(tab); |
| 264 | for(ret=arg; ret<tab->nfd; ret++) |
| 265 | if(tab->fd[ret].file == nil) |
| 266 | goto found; |
| 267 | do { |
| 268 | if((ret = grow1(tab)) < 0) |
| 269 | break; |
| 270 | } while(ret < arg); |
| 271 | found: |
| 272 | if(ret >= 0){ |
| 273 | tab->fd[ret].file = file; |
| 274 | tab->fd[ret].flags = tab->fd[fd].flags & ~FD_CLOEXEC; |
| 275 | file = nil; |
| 276 | } |
| 277 | qunlock(tab); |
| 278 | break; |
| 279 | |
| 280 | case F_GETFD: |
| 281 | case F_SETFD: |
| 282 | qlock(tab); |
| 283 | if(cmd == F_GETFD){ |
| 284 | ret = tab->fd[fd].flags & FD_CLOEXEC; |
| 285 | } else { |
| 286 | tab->fd[fd].flags = (arg & FD_CLOEXEC); |
| 287 | ret = 0; |
| 288 | } |
| 289 | qunlock(tab); |
| 290 | break; |
| 291 | |
| 292 | case F_GETFL: |
| 293 | ret = file->mode; |
| 294 | break; |
| 295 | case F_SETFL: |
| 296 | trace("sys_fcntl() changing mode from %o to %o", file->mode, arg); |
| 297 | file->mode = arg; |
| 298 | ret = 0; |
| 299 | break; |
| 300 | |
| 301 | case F_GETLK: |
| 302 | ((struct linux_flock*)arg)->l_type = F_UNLCK; |
| 303 | case F_SETLK: |
| 304 | case F_SETLKW: |
| 305 | ret = 0; |
| 306 | break; |
| 307 | |
| 308 | case F_GETLK64: |
| 309 | ((struct linux_flock64*)arg)->l_type = F_UNLCK; |
| 310 | case F_SETLK64: |
| 311 | ret = 0; |
| 312 | break; |
| 313 | } |
| 314 | out: |
| 315 | putfile(file); |
| 316 | return ret; |
| 317 | } |
| 318 | |
| 319 | int sys_close(int fd) |
| 320 | { |
| 321 | Fdtab *tab; |
| 322 | Ufile *file; |
| 323 | |
| 324 | trace("sys_close(%d)", fd); |
| 325 | |
| 326 | tab = current->fdtab; |
| 327 | qlock(tab); |
| 328 | if(fd >= 0 && fd < tab->nfd){ |
| 329 | if(file = tab->fd[fd].file){ |
| 330 | tab->fd[fd].file = nil; |
| 331 | tab->lastfd = fd; |
| 332 | qunlock(tab); |
| 333 | |
| 334 | putfile(file); |
| 335 | return 0; |
| 336 | } |
| 337 | } |
| 338 | qunlock(tab); |
| 339 | return -EBADF; |
| 340 | } |
| 341 | |
| 342 | int sys_ioctl(int fd, int cmd, void *arg) |
| 343 | { |
| 344 | Ufile *file; |
| 345 | int ret; |
| 346 | |
| 347 | trace("sys_ioctl(%d, %lux, %p)", fd, (ulong)cmd, arg); |
| 348 | |
| 349 | if((file = fdgetfile(fd)) == nil) |
| 350 | return -EBADF; |
| 351 | ret = -ENOTTY; |
| 352 | if(devtab[file->dev]->ioctl) |
| 353 | ret = devtab[file->dev]->ioctl(file, cmd, arg); |
| 354 | putfile(file); |
| 355 | return ret; |
| 356 | } |
| 357 | |
| 358 | int preadfile(Ufile *file, void *buf, int len, vlong off) |
| 359 | { |
| 360 | if(file->mode & O_NONBLOCK){ |
| 361 | if(devtab[file->dev]->poll != nil){ |
| 362 | if((devtab[file->dev]->poll(file, nil) & POLLIN) == 0){ |
| 363 | trace("readfile(): nonblocking read blocked"); |
| 364 | |
| 365 | return -EAGAIN; |
| 366 | } |
| 367 | } |
| 368 | } |
| 369 | if(devtab[file->dev]->read == nil) |
| 370 | return 0; |
| 371 | return devtab[file->dev]->read(file, buf, len, off); |
| 372 | } |
| 373 | |
| 374 | int readfile(Ufile *file, void *buf, int len) |
| 375 | { |
| 376 | int err; |
| 377 | |
| 378 | if((err = preadfile(file, buf, len, file->off)) > 0) |
| 379 | file->off += err; |
| 380 | return err; |
| 381 | } |
| 382 | |
| 383 | int pwritefile(Ufile *file, void *buf, int len, vlong off) |
| 384 | { |
| 385 | if(devtab[file->dev]->write == nil) |
| 386 | return 0; |
| 387 | if(file->mode & O_APPEND){ |
| 388 | if(devtab[file->dev]->size){ |
| 389 | off = devtab[file->dev]->size(file); |
| 390 | if(off < 0) |
| 391 | return (int)off; |
| 392 | } |
| 393 | } |
| 394 | return devtab[file->dev]->write(file, buf, len, off); |
| 395 | } |
| 396 | |
| 397 | int writefile(Ufile *file, void *buf, int len) |
| 398 | { |
| 399 | int err; |
| 400 | vlong end; |
| 401 | |
| 402 | if(devtab[file->dev]->write == nil) |
| 403 | return 0; |
| 404 | if(file->mode & O_APPEND){ |
| 405 | if(devtab[file->dev]->size){ |
| 406 | end = devtab[file->dev]->size(file); |
| 407 | if(end < 0) |
| 408 | return (int)end; |
| 409 | file->off = end; |
| 410 | } |
| 411 | } |
| 412 | if(len == 0) |
| 413 | return 0; |
| 414 | if((err = devtab[file->dev]->write(file, buf, len, file->off)) > 0) |
| 415 | file->off += err; |
| 416 | return err; |
| 417 | } |
| 418 | |
| 419 | int sys_read(int fd, void *buf, int len) |
| 420 | { |
| 421 | int ret; |
| 422 | Ufile *file; |
| 423 | |
| 424 | trace("sys_read(%d, %p, %x)", fd, buf, len); |
| 425 | if((file = fdgetfile(fd)) == nil) |
| 426 | return -EBADF; |
| 427 | ret = readfile(file, buf, len); |
| 428 | putfile(file); |
| 429 | return ret; |
| 430 | } |
| 431 | |
| 432 | int sys_write(int fd, void *buf, int len) |
| 433 | { |
| 434 | Ufile *file; |
| 435 | int ret; |
| 436 | |
| 437 | trace("sys_write(%d, %p, %x)", fd, buf, len); |
| 438 | if((file = fdgetfile(fd)) == nil) |
| 439 | return -EBADF; |
| 440 | ret = writefile(file, buf, len); |
| 441 | putfile(file); |
| 442 | |
| 443 | return ret; |
| 444 | } |
| 445 | |
| 446 | int sys_pread64(int fd, void *buf, int len, ulong off) |
| 447 | { |
| 448 | Ufile *file; |
| 449 | int ret; |
| 450 | |
| 451 | trace("sys_pread(%d, %p, %x, %lux)", fd, buf, len, off); |
| 452 | if((file = fdgetfile(fd)) == nil) |
| 453 | return -EBADF; |
| 454 | ret = preadfile(file, buf, len, off); |
| 455 | putfile(file); |
| 456 | return ret; |
| 457 | } |
| 458 | |
| 459 | int sys_pwrite64(int fd, void *buf, int len, ulong off) |
| 460 | { |
| 461 | Ufile *file; |
| 462 | int ret; |
| 463 | |
| 464 | trace("sys_pwrite(%d, %p, %x, %lux)", fd, buf, len, off); |
| 465 | if((file = fdgetfile(fd)) == nil) |
| 466 | return -EBADF; |
| 467 | ret = pwritefile(file, buf, len, off); |
| 468 | putfile(file); |
| 469 | return ret; |
| 470 | } |
| 471 | |
| 472 | struct linux_iovec |
| 473 | { |
| 474 | void *base; |
| 475 | ulong len; |
| 476 | }; |
| 477 | |
| 478 | int sys_writev(int fd, void *vec, int n) |
| 479 | { |
| 480 | struct linux_iovec *v = vec; |
| 481 | int ret, i, w; |
| 482 | Ufile *file; |
| 483 | |
| 484 | trace("sys_writev(%d, %p, %d)", fd, vec, n); |
| 485 | |
| 486 | if((file = fdgetfile(fd)) == nil) |
| 487 | return -EBADF; |
| 488 | ret = 0; |
| 489 | for(i=0; i<n; i++){ |
| 490 | w = writefile(file, v[i].base, v[i].len); |
| 491 | if(w < 0){ |
| 492 | if(ret == 0) |
| 493 | ret = w; |
| 494 | break; |
| 495 | } |
| 496 | ret += w; |
| 497 | if(w < v[i].len) |
| 498 | break; |
| 499 | } |
| 500 | putfile(file); |
| 501 | |
| 502 | return ret; |
| 503 | } |
| 504 | |
| 505 | int sys_readv(int fd, void *vec, int n) |
| 506 | { |
| 507 | struct linux_iovec *v = vec; |
| 508 | int ret, i, r; |
| 509 | Ufile *file; |
| 510 | |
| 511 | trace("sys_readv(%d, %p, %d)", fd, vec, n); |
| 512 | |
| 513 | if((file = fdgetfile(fd)) == nil) |
| 514 | return -EBADF; |
| 515 | ret = 0; |
| 516 | for(i=0; i<n; i++){ |
| 517 | r = readfile(file, v[i].base, v[i].len); |
| 518 | if(r < 0){ |
| 519 | if(ret == 0) |
| 520 | ret = r; |
| 521 | break; |
| 522 | } |
| 523 | ret += r; |
| 524 | if(r < v[i].len) |
| 525 | break; |
| 526 | } |
| 527 | putfile(file); |
| 528 | |
| 529 | return ret; |
| 530 | } |
| 531 | |
| 532 | int seekfile(Ufile *file, vlong off, int whence) |
| 533 | { |
| 534 | vlong end; |
| 535 | |
| 536 | if(devtab[file->dev]->size == nil) |
| 537 | return -ESPIPE; |
| 538 | |
| 539 | switch(whence){ |
| 540 | case 0: |
| 541 | file->off = off; |
| 542 | return 0; |
| 543 | case 1: |
| 544 | file->off += off; |
| 545 | return 0; |
| 546 | case 2: |
| 547 | end = devtab[file->dev]->size(file); |
| 548 | if(end < 0) |
| 549 | return end; |
| 550 | file->off = end + off; |
| 551 | return 0; |
| 552 | } |
| 553 | |
| 554 | return -EINVAL; |
| 555 | } |
| 556 | |
| 557 | ulong sys_lseek(int fd, ulong off, int whence) |
| 558 | { |
| 559 | Ufile *file; |
| 560 | int ret; |
| 561 | |
| 562 | trace("sys_lseek(%d, %lux, %d)", fd, off, whence); |
| 563 | |
| 564 | if((file = fdgetfile(fd)) == nil) |
| 565 | return (ulong)-EBADF; |
| 566 | ret = seekfile(file, off, whence); |
| 567 | if(ret == 0) |
| 568 | ret = file->off; |
| 569 | putfile(file); |
| 570 | |
| 571 | return ret; |
| 572 | } |
| 573 | |
| 574 | int sys_llseek(int fd, ulong hioff, ulong looff, vlong *res, int whence) |
| 575 | { |
| 576 | Ufile *file; |
| 577 | int ret; |
| 578 | |
| 579 | trace("sys_llseek(%d, %lux, %lux, %p, %d)", fd, hioff, looff, res, whence); |
| 580 | |
| 581 | if((file = fdgetfile(fd)) == nil) |
| 582 | return -EBADF; |
| 583 | ret = seekfile(file, ((vlong)hioff<<32) | ((vlong)looff), whence); |
| 584 | if((ret == 0) && res) |
| 585 | *res = file->off; |
| 586 | putfile(file); |
| 587 | |
| 588 | return ret; |
| 589 | } |
| 590 | |
| 591 | int sys_umask(int umask) |
| 592 | { |
| 593 | int old; |
| 594 | |
| 595 | trace("sys_umask(%#o)", umask); |
| 596 | |
| 597 | old = current->umask; |
| 598 | current->umask = (umask & 0777); |
| 599 | return old; |
| 600 | } |
| 601 | |
| 602 | int |
| 603 | chdirfile(Ufile *f) |
| 604 | { |
| 605 | Ustat s; |
| 606 | int err; |
| 607 | |
| 608 | trace("chdirfile(%s)", f->path); |
| 609 | |
| 610 | err = -ENOTDIR; |
| 611 | if(f->path == nil) |
| 612 | return err; |
| 613 | if(devtab[f->dev]->fstat == nil) |
| 614 | return err; |
| 615 | if((err = devtab[f->dev]->fstat(f, &s)) < 0) |
| 616 | return err; |
| 617 | err = -ENOTDIR; |
| 618 | if((s.mode & ~0777) != S_IFDIR) |
| 619 | return err; |
| 620 | free(current->cwd); |
| 621 | current->cwd = kstrdup(fsrootpath(f->path)); |
| 622 | if(f->dev == ROOTDEV && chdir(f->path) == 0){ |
| 623 | free(current->kcwd); |
| 624 | current->kcwd = kstrdup(f->path); |
| 625 | } |
| 626 | return 0; |
| 627 | } |
| 628 | |
| 629 | int |
| 630 | sys_fchdir(int fd) |
| 631 | { |
| 632 | Ufile *f; |
| 633 | int err; |
| 634 | |
| 635 | trace("sys_fchdir(%d)", fd); |
| 636 | |
| 637 | if((f = fdgetfile(fd)) == nil) |
| 638 | return -EBADF; |
| 639 | err = chdirfile(f); |
| 640 | putfile(f); |
| 641 | return err; |
| 642 | } |
| 643 | |
| 644 | int |
| 645 | sys_fchown(int fd, int uid, int gid) |
| 646 | { |
| 647 | int err; |
| 648 | Ufile *f; |
| 649 | |
| 650 | trace("sys_fchown(%d, %d, %d)", fd, uid, gid); |
| 651 | |
| 652 | if((f = fdgetfile(fd)) == nil) |
| 653 | return -EBADF; |
| 654 | err = -EPERM; |
| 655 | if(devtab[f->dev]->fchown) |
| 656 | err = devtab[f->dev]->fchown(f, uid, gid); |
| 657 | putfile(f); |
| 658 | |
| 659 | return err; |
| 660 | } |
| 661 | |
| 662 | int |
| 663 | sys_fchmod(int fd, int mode) |
| 664 | { |
| 665 | int err; |
| 666 | Ufile *f; |
| 667 | |
| 668 | trace("sys_fchmod(%d, %#o)", fd, mode); |
| 669 | |
| 670 | if((f = fdgetfile(fd)) == nil) |
| 671 | return -EBADF; |
| 672 | err = -EPERM; |
| 673 | if(devtab[f->dev]->fchmod) |
| 674 | err = devtab[f->dev]->fchmod(f, mode); |
| 675 | putfile(f); |
| 676 | |
| 677 | return err; |
| 678 | } |
| 679 | |
| 680 | int |
| 681 | sys_ftruncate(int fd, ulong size) |
| 682 | { |
| 683 | int err; |
| 684 | Ufile *f; |
| 685 | |
| 686 | trace("sys_ftruncate(%d, %lux)", fd, size); |
| 687 | |
| 688 | if((f = fdgetfile(fd)) == nil) |
| 689 | return -EBADF; |
| 690 | err = -EPERM; |
| 691 | if(devtab[f->dev]->ftruncate) |
| 692 | err = devtab[f->dev]->ftruncate(f, (uvlong)size); |
| 693 | putfile(f); |
| 694 | |
| 695 | return err; |
| 696 | } |
| 697 | |
| 698 | void initfile(void) |
| 699 | { |
| 700 | current->fdtab = newfdtab(); |
| 701 | current->umask = 022; |
| 702 | } |
| 703 | |
| 704 | void exitfile(Uproc *proc) |
| 705 | { |
| 706 | Fdtab *tab; |
| 707 | |
| 708 | if(tab = proc->fdtab){ |
| 709 | proc->fdtab = nil; |
| 710 | putfdtab(tab); |
| 711 | } |
| 712 | } |
| 713 | |
| 714 | void clonefile(Uproc *new, int copy) |
| 715 | { |
| 716 | Fdtab *tab; |
| 717 | |
| 718 | if((tab = current->fdtab) == nil){ |
| 719 | new->fdtab = nil; |
| 720 | return; |
| 721 | } |
| 722 | new->fdtab = getfdtab(tab, copy); |
| 723 | } |
| 724 | |
| 725 | void closexfds(void) |
| 726 | { |
| 727 | Fdtab *tab; |
| 728 | int i; |
| 729 | |
| 730 | if((tab = current->fdtab) == nil) |
| 731 | return; |
| 732 | qlock(tab); |
| 733 | for(i=0; i<tab->nfd; i++){ |
| 734 | Ufile *f; |
| 735 | |
| 736 | if((f = tab->fd[i].file) == nil) |
| 737 | continue; |
| 738 | if((tab->fd[i].flags & FD_CLOEXEC) == 0) |
| 739 | continue; |
| 740 | |
| 741 | tab->fd[i].file = nil; |
| 742 | tab->fd[i].flags = 0; |
| 743 | |
| 744 | putfile(f); |
| 745 | } |
| 746 | qunlock(tab); |
| 747 | } |
| 748 | |
| 749 | int sys_flock(int fd, int cmd) |
| 750 | { |
| 751 | trace("sys_flock(%d, %d)", fd, cmd); |
| 752 | return 0; |
| 753 | } |
| 754 | |
| 755 | int sys_fsync(int fd) |
| 756 | { |
| 757 | trace("sys_fsync(%d)", fd); |
| 758 | return 0; |
| 759 | } |
| 760 | |