linux_llseek.c revision 1.7
1 /* $NetBSD: linux_llseek.c,v 1.7 1995/07/24 06:35:28 fvdl Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Frank van der Linden 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed for the NetBSD Project 18 * by Frank van der Linden 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/namei.h> 37 #include <sys/proc.h> 38 #include <sys/file.h> 39 #include <sys/stat.h> 40 #include <sys/filedesc.h> 41 #include <sys/ioctl.h> 42 #include <sys/kernel.h> 43 #include <sys/mount.h> 44 #include <sys/malloc.h> 45 46 #include <sys/syscallargs.h> 47 48 #include <compat/linux/linux_types.h> 49 #include <compat/linux/linux_syscallargs.h> 50 #include <compat/linux/linux_fcntl.h> 51 #include <compat/linux/linux_util.h> 52 53 /* 54 * Some file-related calls are handled here. The usual flag conversion 55 * an structure conversion is done, and alternate emul path searching. 56 */ 57 58 /* 59 * The next two functions convert between the Linux and NetBSD values 60 * of the flags used in open(2) and fcntl(2). 61 */ 62 static int 63 linux_to_bsd_ioflags(int lflags) 64 { 65 int res = 0; 66 67 res |= cvtto_bsd_mask(lflags, LINUX_O_WRONLY, O_WRONLY); 68 res |= cvtto_bsd_mask(lflags, LINUX_O_RDONLY, O_RDONLY); 69 res |= cvtto_bsd_mask(lflags, LINUX_O_RDWR, O_RDWR); 70 res |= cvtto_bsd_mask(lflags, LINUX_O_CREAT, O_CREAT); 71 res |= cvtto_bsd_mask(lflags, LINUX_O_EXCL, O_EXCL); 72 res |= cvtto_bsd_mask(lflags, LINUX_O_NOCTTY, O_NOCTTY); 73 res |= cvtto_bsd_mask(lflags, LINUX_O_TRUNC, O_TRUNC); 74 res |= cvtto_bsd_mask(lflags, LINUX_O_NDELAY, O_NDELAY); 75 res |= cvtto_bsd_mask(lflags, LINUX_O_SYNC, O_FSYNC); 76 res |= cvtto_bsd_mask(lflags, LINUX_FASYNC, O_ASYNC); 77 res |= cvtto_bsd_mask(lflags, LINUX_O_APPEND, O_APPEND); 78 79 return res; 80 } 81 82 static int 83 bsd_to_linux_ioflags(int bflags) 84 { 85 int res = 0; 86 87 res |= cvtto_linux_mask(bflags, O_WRONLY, LINUX_O_WRONLY); 88 res |= cvtto_linux_mask(bflags, O_RDONLY, LINUX_O_RDONLY); 89 res |= cvtto_linux_mask(bflags, O_RDWR, LINUX_O_RDWR); 90 res |= cvtto_linux_mask(bflags, O_CREAT, LINUX_O_CREAT); 91 res |= cvtto_linux_mask(bflags, O_EXCL, LINUX_O_EXCL); 92 res |= cvtto_linux_mask(bflags, O_NOCTTY, LINUX_O_NOCTTY); 93 res |= cvtto_linux_mask(bflags, O_TRUNC, LINUX_O_TRUNC); 94 res |= cvtto_linux_mask(bflags, O_NDELAY, LINUX_O_NDELAY); 95 res |= cvtto_linux_mask(bflags, O_FSYNC, LINUX_O_SYNC); 96 res |= cvtto_linux_mask(bflags, O_ASYNC, LINUX_FASYNC); 97 res |= cvtto_linux_mask(bflags, O_APPEND, LINUX_O_APPEND); 98 99 return res; 100 } 101 102 /* 103 * creat(2) is an obsolete function, but it's present as a Linux 104 * system call, so let's deal with it. 105 * 106 * Just call open(2) with the TRUNC, CREAT and WRONLY flags. 107 */ 108 int 109 linux_creat(p, uap, retval) 110 struct proc *p; 111 struct linux_creat_args /* { 112 syscallarg(char *) path; 113 syscallarg(int) mode; 114 } */ *uap; 115 register_t *retval; 116 { 117 struct open_args oa; 118 caddr_t sg; 119 120 sg = stackgap_init(p->p_emul); 121 LINUX_CHECK_ALT_CREAT(p, &sg, SCARG(uap, path)); 122 123 SCARG(&oa, path) = SCARG(uap, path); 124 SCARG(&oa, flags) = O_CREAT | O_TRUNC | O_WRONLY; 125 SCARG(&oa, mode) = SCARG(uap, mode); 126 return open(p, &oa, retval); 127 } 128 129 /* 130 * open(2). Take care of the different flag values, and let the 131 * NetBSD syscall do the real work. See if this operation 132 * gives the current process a controlling terminal. 133 * (XXX is this necessary?) 134 */ 135 int 136 linux_open(p, uap, retval) 137 struct proc *p; 138 struct linux_open_args /* { 139 syscallarg(char *) path; 140 syscallarg(int) flags; 141 syscallarg(int) mode; 142 } */ *uap; 143 register_t *retval; 144 { 145 int error, fl; 146 struct open_args boa; 147 caddr_t sg; 148 149 sg = stackgap_init(p->p_emul); 150 151 fl = linux_to_bsd_ioflags(SCARG(uap, flags)); 152 153 if (fl & O_CREAT) 154 LINUX_CHECK_ALT_CREAT(p, &sg, SCARG(uap, path)); 155 else 156 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 157 158 SCARG(&boa, path) = SCARG(uap, path); 159 SCARG(&boa, flags) = fl; 160 SCARG(&boa, mode) = SCARG(uap, mode); 161 162 if ((error = open(p, &boa, retval))) 163 return error; 164 165 /* 166 * this bit from sunos_misc.c (and svr4_fcntl.c). 167 * If we are a session leader, and we don't have a controlling 168 * terminal yet, and the O_NOCTTY flag is not set, try to make 169 * this the controlling terminal. 170 */ 171 if (!(fl & O_NOCTTY) && SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) { 172 struct filedesc *fdp = p->p_fd; 173 struct file *fp = fdp->fd_ofiles[*retval]; 174 175 /* ignore any error, just give it a try */ 176 if (fp->f_type == DTYPE_VNODE) 177 (fp->f_ops->fo_ioctl) (fp, TIOCSCTTY, (caddr_t) 0, p); 178 } 179 return 0; 180 } 181 182 /* 183 * This appears to be part of a Linux attempt to switch to 64 bits file sizes. 184 */ 185 int 186 linux_llseek(p, uap, retval) 187 struct proc *p; 188 struct linux_llseek_args /* { 189 syscallarg(int) fd; 190 syscallarg(uint32_t) ohigh; 191 syscallarg(uint32_t) olow; 192 syscallarg(caddr_t) res; 193 syscallarg(int) whence; 194 } */ *uap; 195 register_t *retval; 196 { 197 struct lseek_args bla; 198 int error; 199 off_t off; 200 201 off = SCARG(uap, olow) | (((off_t) SCARG(uap, ohigh)) << 32); 202 203 SCARG(&bla, fd) = SCARG(uap, fd); 204 SCARG(&bla, offset) = off; 205 SCARG(&bla, whence) = SCARG(uap, whence); 206 207 if ((error = lseek(p, &bla, retval))) 208 return error; 209 210 if ((error = copyout(retval, SCARG(uap, res), sizeof (off_t)))) 211 return error; 212 213 retval[0] = 0; 214 return 0; 215 } 216 217 /* 218 * The next two functions take care of converting the flock 219 * structure back and forth between Linux and NetBSD format. 220 * The only difference in the structures is the order of 221 * the fields, and the 'whence' value. 222 */ 223 static void 224 bsd_to_linux_flock(bfp, lfp) 225 struct flock *bfp; 226 struct linux_flock *lfp; 227 { 228 lfp->l_start = bfp->l_start; 229 lfp->l_len = bfp->l_len; 230 lfp->l_pid = bfp->l_pid; 231 lfp->l_whence = bfp->l_whence; 232 switch (bfp->l_type) { 233 case F_RDLCK: 234 lfp->l_type = LINUX_F_RDLCK; 235 break; 236 case F_UNLCK: 237 lfp->l_type = LINUX_F_UNLCK; 238 break; 239 case F_WRLCK: 240 lfp->l_type = LINUX_F_WRLCK; 241 break; 242 } 243 } 244 245 static void 246 linux_to_bsd_flock(lfp, bfp) 247 struct linux_flock *lfp; 248 struct flock *bfp; 249 { 250 bfp->l_start = lfp->l_start; 251 bfp->l_len = lfp->l_len; 252 bfp->l_pid = lfp->l_pid; 253 bfp->l_whence = lfp->l_whence; 254 switch (lfp->l_type) { 255 case LINUX_F_RDLCK: 256 bfp->l_type = F_RDLCK; 257 break; 258 case LINUX_F_UNLCK: 259 bfp->l_type = F_UNLCK; 260 break; 261 case LINUX_F_WRLCK: 262 bfp->l_type = F_WRLCK; 263 break; 264 } 265 } 266 267 /* 268 * Most actions in the fcntl() call are straightforward; simply 269 * pass control to the NetBSD system call. A few commands need 270 * conversions after the actual system call has done its work, 271 * because the flag values and lock structure are different. 272 */ 273 int 274 linux_fcntl(p, uap, retval) 275 struct proc *p; 276 struct linux_fcntl_args /* { 277 syscallarg(int) fd; 278 syscallarg(int) cmd; 279 syscallarg(void *) arg; 280 } */ *uap; 281 register_t *retval; 282 { 283 int fd, cmd, error, val; 284 caddr_t arg, sg; 285 struct linux_flock lfl; 286 struct flock *bfp, bfl; 287 struct fcntl_args fca; 288 289 fd = SCARG(uap, fd); 290 cmd = SCARG(uap, cmd); 291 arg = (caddr_t) SCARG(uap, arg); 292 293 switch (cmd) { 294 case LINUX_F_DUPFD: 295 cmd = F_DUPFD; 296 break; 297 case LINUX_F_GETFD: 298 cmd = F_GETFD; 299 break; 300 case LINUX_F_SETFD: 301 cmd = F_SETFD; 302 break; 303 case LINUX_F_GETFL: 304 SCARG(&fca, fd) = fd; 305 SCARG(&fca, cmd) = F_GETFL; 306 SCARG(&fca, arg) = arg; 307 if ((error = fcntl(p, &fca, retval))) 308 return error; 309 retval[0] = bsd_to_linux_ioflags(retval[0]); 310 return 0; 311 case LINUX_F_SETFL: 312 val = linux_to_bsd_ioflags((int)SCARG(uap, arg)); 313 SCARG(&fca, fd) = fd; 314 SCARG(&fca, cmd) = F_SETFL; 315 SCARG(&fca, arg) = (caddr_t) val; 316 return fcntl(p, &fca, retval); 317 case LINUX_F_GETLK: 318 sg = stackgap_init(p->p_emul); 319 bfp = (struct flock *) stackgap_alloc(&sg, sizeof *bfp); 320 SCARG(&fca, fd) = fd; 321 SCARG(&fca, cmd) = F_GETLK; 322 SCARG(&fca, arg) = bfp; 323 if ((error = fcntl(p, &fca, retval))) 324 return error; 325 if ((error = copyin(bfp, &bfl, sizeof bfl))) 326 return error; 327 bsd_to_linux_flock(&bfl, &lfl); 328 return copyout(&lfl, arg, sizeof lfl); 329 break; 330 case LINUX_F_SETLK: 331 case LINUX_F_SETLKW: 332 cmd = (cmd == LINUX_F_SETLK ? F_SETLK : F_SETLKW); 333 if ((error = copyin(arg, &lfl, sizeof lfl))) 334 return error; 335 linux_to_bsd_flock(&lfl, &bfl); 336 sg = stackgap_init(p->p_emul); 337 bfp = (struct flock *) stackgap_alloc(&sg, sizeof *bfp); 338 if ((error = copyout(&bfl, bfp, sizeof bfl))) 339 return error; 340 SCARG(&fca, fd) = fd; 341 SCARG(&fca, cmd) = cmd; 342 SCARG(&fca, arg) = bfp; 343 return fcntl(p, &fca, retval); 344 break; 345 case LINUX_F_SETOWN: 346 cmd = F_SETOWN; 347 break; 348 case LINUX_F_GETOWN: 349 cmd = F_GETOWN; 350 break; 351 default: 352 return EOPNOTSUPP; 353 } 354 355 SCARG(&fca, fd) = fd; 356 SCARG(&fca, cmd) = cmd; 357 SCARG(&fca, arg) = arg; 358 return fcntl(p, &fca, retval); 359 } 360 361 /* 362 * Convert a NetBSD stat structure to a Linux stat structure. 363 * Only the order of the fields and the padding in the structure 364 * is different. 365 */ 366 static void 367 bsd_to_linux_stat(bsp, lsp) 368 struct stat *bsp; 369 struct linux_stat *lsp; 370 { 371 lsp->lst_dev = bsp->st_dev; 372 lsp->lst_ino = bsp->st_ino; 373 lsp->lst_mode = bsp->st_mode; 374 lsp->lst_nlink = bsp->st_nlink; 375 lsp->lst_uid = bsp->st_uid; 376 lsp->lst_gid = bsp->st_gid; 377 lsp->lst_rdev = bsp->st_rdev; 378 lsp->lst_size = bsp->st_size; 379 lsp->lst_blksize = bsp->st_blksize; 380 lsp->lst_blocks = bsp->st_blocks; 381 lsp->lst_atime = bsp->st_atime; 382 lsp->lst_mtime = bsp->st_mtime; 383 lsp->lst_ctime = bsp->st_ctime; 384 } 385 386 /* 387 * The stat functions below are plain sailing. stat and lstat are handled 388 * by one function to avoid code duplication. 389 */ 390 int 391 linux_fstat(p, uap, retval) 392 struct proc *p; 393 struct linux_fstat_args /* { 394 syscallarg(int) fd; 395 syscallarg(linux_stat *) sp; 396 } */ *uap; 397 register_t *retval; 398 { 399 struct fstat_args fsa; 400 struct linux_stat tmplst; 401 struct stat *st,tmpst; 402 caddr_t sg; 403 int error; 404 405 sg = stackgap_init(p->p_emul); 406 407 st = stackgap_alloc(&sg, sizeof (struct stat)); 408 409 SCARG(&fsa, fd) = SCARG(uap, fd); 410 SCARG(&fsa, sb) = st; 411 412 if ((error = fstat(p, &fsa, retval))) 413 return error; 414 415 if ((error = copyin(st, &tmpst, sizeof tmpst))) 416 return error; 417 418 bsd_to_linux_stat(&tmpst, &tmplst); 419 420 if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst))) 421 return error; 422 423 return 0; 424 } 425 426 static int 427 linux_stat1(p, uap, retval, dolstat) 428 struct proc *p; 429 struct linux_stat_args *uap; 430 register_t *retval; 431 int dolstat; 432 { 433 struct stat_args sa; 434 struct linux_stat tmplst; 435 struct stat *st, tmpst; 436 caddr_t sg; 437 int error; 438 439 sg = stackgap_init(p->p_emul); 440 441 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 442 443 st = stackgap_alloc(&sg, sizeof (struct stat)); 444 SCARG(&sa, ub) = st; 445 SCARG(&sa, path) = SCARG(uap, path); 446 447 if ((error = (dolstat ? lstat(p, &sa, retval) : stat(p, &sa, retval)))) 448 return error; 449 450 if ((error = copyin(st, &tmpst, sizeof tmpst))) 451 return error; 452 453 bsd_to_linux_stat(&tmpst, &tmplst); 454 455 if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst))) 456 return error; 457 458 return 0; 459 } 460 461 int 462 linux_stat(p, uap, retval) 463 struct proc *p; 464 struct linux_stat_args /* { 465 syscallarg(char *) path; 466 syscallarg(struct linux_stat *) sp; 467 } */ *uap; 468 register_t *retval; 469 { 470 return linux_stat1(p, uap, retval, 0); 471 } 472 473 int 474 linux_lstat(p, uap, retval) 475 struct proc *p; 476 struct linux_lstat_args /* { 477 syscallarg(char *) path; 478 syscallarg(struct linux_stat *) sp; 479 } */ *uap; 480 register_t *retval; 481 { 482 return linux_stat1(p, uap, retval, 1); 483 } 484 485 /* 486 * The following syscalls are only here because of the alternate path check. 487 */ 488 int 489 linux_access(p, uap, retval) 490 struct proc *p; 491 struct linux_access_args /* { 492 syscallarg(char *) path; 493 syscallarg(int) flags; 494 } */ *uap; 495 register_t *retval; 496 { 497 caddr_t sg = stackgap_init(p->p_emul); 498 499 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 500 501 return access(p, uap, retval); 502 } 503 504 int 505 linux_unlink(p, uap, retval) 506 struct proc *p; 507 struct linux_unlink_args /* { 508 syscallarg(char *) path; 509 } */ *uap; 510 register_t *retval; 511 512 { 513 caddr_t sg = stackgap_init(p->p_emul); 514 515 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 516 517 return unlink(p, uap, retval); 518 } 519 520 int linux_chdir(p, uap, retval) 521 struct proc *p; 522 struct linux_chdir_args /* { 523 syscallarg(char *) path; 524 } */ *uap; 525 register_t *retval; 526 { 527 caddr_t sg = stackgap_init(p->p_emul); 528 529 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 530 531 return chdir(p, uap, retval); 532 } 533 534 int 535 linux_mknod(p, uap, retval) 536 struct proc *p; 537 struct linux_mknod_args /* { 538 syscallarg(char *) path; 539 syscallarg(int) mode; 540 syscallarg(int) dev; 541 } */ *uap; 542 register_t *retval; 543 { 544 caddr_t sg = stackgap_init(p->p_emul); 545 546 LINUX_CHECK_ALT_CREAT(p, &sg, SCARG(uap, path)); 547 548 return mknod(p, uap, retval); 549 } 550 551 int 552 linux_chmod(p, uap, retval) 553 struct proc *p; 554 struct linux_chmod_args /* { 555 syscallarg(char *) path; 556 syscallarg(int) mode; 557 } */ *uap; 558 register_t *retval; 559 { 560 caddr_t sg = stackgap_init(p->p_emul); 561 562 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 563 564 return chmod(p, uap, retval); 565 } 566 567 int 568 linux_chown(p, uap, retval) 569 struct proc *p; 570 struct linux_chown_args /* { 571 syscallarg(char *) path; 572 syscallarg(int) uid; 573 syscallarg(int) gid; 574 } */ *uap; 575 register_t *retval; 576 { 577 caddr_t sg = stackgap_init(p->p_emul); 578 579 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 580 581 return chmod(p, uap, retval); 582 } 583 584 int 585 linux_rename(p, uap, retval) 586 struct proc *p; 587 struct linux_rename_args /* { 588 syscallarg(char *) from; 589 syscallarg(char *) to; 590 } */ *uap; 591 register_t *retval; 592 { 593 caddr_t sg = stackgap_init(p->p_emul); 594 595 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, from)); 596 LINUX_CHECK_ALT_CREAT(p, &sg, SCARG(uap, to)); 597 598 return rename(p, uap, retval); 599 } 600 601 int 602 linux_mkdir(p, uap, retval) 603 struct proc *p; 604 struct linux_mkdir_args /* { 605 syscallarg(char *) path; 606 syscallarg(int) mode; 607 } */ *uap; 608 register_t *retval; 609 { 610 caddr_t sg = stackgap_init(p->p_emul); 611 612 LINUX_CHECK_ALT_CREAT(p, &sg, SCARG(uap, path)); 613 return mkdir(p, uap, retval); 614 } 615 616 int 617 linux_rmdir(p, uap, retval) 618 struct proc *p; 619 struct linux_rmdir_args /* { 620 syscallarg(char *) path; 621 } */ *uap; 622 register_t *retval; 623 { 624 caddr_t sg = stackgap_init(p->p_emul); 625 626 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 627 return rmdir(p, uap, retval); 628 } 629 630 int 631 linux_symlink(p, uap, retval) 632 struct proc *p; 633 struct linux_symlink_args /* { 634 syscallarg(char *) path; 635 syscallarg(char *) to; 636 } */ *uap; 637 register_t *retval; 638 { 639 caddr_t sg = stackgap_init(p->p_emul); 640 641 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 642 LINUX_CHECK_ALT_CREAT(p, &sg, SCARG(uap, to)); 643 644 return symlink(p, uap, retval); 645 } 646 647 int 648 linux_readlink(p, uap, retval) 649 struct proc *p; 650 struct linux_readlink_args /* { 651 syscallarg(char *) name; 652 syscallarg(char *) buf; 653 syscallarg(int) count; 654 } */ *uap; 655 { 656 caddr_t sg = stackgap_init(p->p_emul); 657 658 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, name)); 659 return readlink(p, uap, retval); 660 } 661 662 int 663 linux_truncate(p, uap, retval) 664 struct proc *p; 665 struct linux_truncate_args /* { 666 syscallarg(char *) path; 667 syscallarg(long) length; 668 } */ *uap; 669 { 670 caddr_t sg = stackgap_init(p->p_emul); 671 672 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 673 return compat_43_truncate(p, uap, retval); 674 } 675
Indexes created Tue Sep 23 07:09:52 GMT 2025