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sys/compat/linux/common/linux_file.c
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1 /* $NetBSD: linux_file.c,v 1.62.2.1 2004/08/15 14:23:45 tron Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden and Eric Haszlakiewicz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Functions in multiarch: 41 * linux_sys_llseek : linux_llseek.c 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: linux_file.c,v 1.62.2.1 2004/08/15 14:23:45 tron Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/namei.h> 50 #include <sys/proc.h> 51 #include <sys/file.h> 52 #include <sys/stat.h> 53 #include <sys/filedesc.h> 54 #include <sys/ioctl.h> 55 #include <sys/kernel.h> 56 #include <sys/mount.h> 57 #include <sys/malloc.h> 58 #include <sys/vnode.h> 59 #include <sys/tty.h> 60 #include <sys/socketvar.h> 61 #include <sys/conf.h> 62 #include <sys/pipe.h> 63 64 #include <sys/sa.h> 65 #include <sys/syscallargs.h> 66 67 #include <compat/linux/common/linux_types.h> 68 #include <compat/linux/common/linux_signal.h> 69 #include <compat/linux/common/linux_fcntl.h> 70 #include <compat/linux/common/linux_util.h> 71 #include <compat/linux/common/linux_machdep.h> 72 73 #include <compat/linux/linux_syscallargs.h> 74 75 static int linux_to_bsd_ioflags __P((int)); 76 static int bsd_to_linux_ioflags __P((int)); 77 static void bsd_to_linux_flock __P((struct flock *, struct linux_flock *)); 78 static void linux_to_bsd_flock __P((struct linux_flock *, struct flock *)); 79 static void bsd_to_linux_stat __P((struct stat *, struct linux_stat *)); 80 static int linux_stat1 __P((struct lwp *, void *, register_t *, int)); 81 82 /* 83 * Some file-related calls are handled here. The usual flag conversion 84 * an structure conversion is done, and alternate emul path searching. 85 */ 86 87 /* 88 * The next two functions convert between the Linux and NetBSD values 89 * of the flags used in open(2) and fcntl(2). 90 */ 91 static int 92 linux_to_bsd_ioflags(lflags) 93 int lflags; 94 { 95 int res = 0; 96 97 res |= cvtto_bsd_mask(lflags, LINUX_O_WRONLY, O_WRONLY); 98 res |= cvtto_bsd_mask(lflags, LINUX_O_RDONLY, O_RDONLY); 99 res |= cvtto_bsd_mask(lflags, LINUX_O_RDWR, O_RDWR); 100 res |= cvtto_bsd_mask(lflags, LINUX_O_CREAT, O_CREAT); 101 res |= cvtto_bsd_mask(lflags, LINUX_O_EXCL, O_EXCL); 102 res |= cvtto_bsd_mask(lflags, LINUX_O_NOCTTY, O_NOCTTY); 103 res |= cvtto_bsd_mask(lflags, LINUX_O_TRUNC, O_TRUNC); 104 res |= cvtto_bsd_mask(lflags, LINUX_O_NDELAY, O_NDELAY); 105 res |= cvtto_bsd_mask(lflags, LINUX_O_SYNC, O_FSYNC); 106 res |= cvtto_bsd_mask(lflags, LINUX_FASYNC, O_ASYNC); 107 res |= cvtto_bsd_mask(lflags, LINUX_O_APPEND, O_APPEND); 108 109 return res; 110 } 111 112 static int 113 bsd_to_linux_ioflags(bflags) 114 int bflags; 115 { 116 int res = 0; 117 118 res |= cvtto_linux_mask(bflags, O_WRONLY, LINUX_O_WRONLY); 119 res |= cvtto_linux_mask(bflags, O_RDONLY, LINUX_O_RDONLY); 120 res |= cvtto_linux_mask(bflags, O_RDWR, LINUX_O_RDWR); 121 res |= cvtto_linux_mask(bflags, O_CREAT, LINUX_O_CREAT); 122 res |= cvtto_linux_mask(bflags, O_EXCL, LINUX_O_EXCL); 123 res |= cvtto_linux_mask(bflags, O_NOCTTY, LINUX_O_NOCTTY); 124 res |= cvtto_linux_mask(bflags, O_TRUNC, LINUX_O_TRUNC); 125 res |= cvtto_linux_mask(bflags, O_NDELAY, LINUX_O_NDELAY); 126 res |= cvtto_linux_mask(bflags, O_FSYNC, LINUX_O_SYNC); 127 res |= cvtto_linux_mask(bflags, O_ASYNC, LINUX_FASYNC); 128 res |= cvtto_linux_mask(bflags, O_APPEND, LINUX_O_APPEND); 129 130 return res; 131 } 132 133 /* 134 * creat(2) is an obsolete function, but it's present as a Linux 135 * system call, so let's deal with it. 136 * 137 * Note: On the Alpha this doesn't really exist in Linux, but it's defined 138 * in syscalls.master anyway so this doesn't have to be special cased. 139 * 140 * Just call open(2) with the TRUNC, CREAT and WRONLY flags. 141 */ 142 int 143 linux_sys_creat(l, v, retval) 144 struct lwp *l; 145 void *v; 146 register_t *retval; 147 { 148 struct linux_sys_creat_args /* { 149 syscallarg(const char *) path; 150 syscallarg(int) mode; 151 } */ *uap = v; 152 struct proc *p = l->l_proc; 153 struct sys_open_args oa; 154 caddr_t sg; 155 156 sg = stackgap_init(p, 0); 157 CHECK_ALT_CREAT(p, &sg, SCARG(uap, path)); 158 159 SCARG(&oa, path) = SCARG(uap, path); 160 SCARG(&oa, flags) = O_CREAT | O_TRUNC | O_WRONLY; 161 SCARG(&oa, mode) = SCARG(uap, mode); 162 163 return sys_open(l, &oa, retval); 164 } 165 166 /* 167 * open(2). Take care of the different flag values, and let the 168 * NetBSD syscall do the real work. See if this operation 169 * gives the current process a controlling terminal. 170 * (XXX is this necessary?) 171 */ 172 int 173 linux_sys_open(l, v, retval) 174 struct lwp *l; 175 void *v; 176 register_t *retval; 177 { 178 struct linux_sys_open_args /* { 179 syscallarg(const char *) path; 180 syscallarg(int) flags; 181 syscallarg(int) mode; 182 } */ *uap = v; 183 struct proc *p = l->l_proc; 184 int error, fl; 185 struct sys_open_args boa; 186 caddr_t sg; 187 188 sg = stackgap_init(p, 0); 189 190 fl = linux_to_bsd_ioflags(SCARG(uap, flags)); 191 192 if (fl & O_CREAT) 193 CHECK_ALT_CREAT(p, &sg, SCARG(uap, path)); 194 else 195 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 196 197 SCARG(&boa, path) = SCARG(uap, path); 198 SCARG(&boa, flags) = fl; 199 SCARG(&boa, mode) = SCARG(uap, mode); 200 201 if ((error = sys_open(l, &boa, retval))) 202 return error; 203 204 /* 205 * this bit from sunos_misc.c (and svr4_fcntl.c). 206 * If we are a session leader, and we don't have a controlling 207 * terminal yet, and the O_NOCTTY flag is not set, try to make 208 * this the controlling terminal. 209 */ 210 if (!(fl & O_NOCTTY) && SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) { 211 struct filedesc *fdp = p->p_fd; 212 struct file *fp; 213 214 fp = fd_getfile(fdp, *retval); 215 216 /* ignore any error, just give it a try */ 217 if (fp != NULL) { 218 FILE_USE(fp); 219 if (fp->f_type == DTYPE_VNODE) { 220 (fp->f_ops->fo_ioctl) (fp, TIOCSCTTY, 221 (caddr_t) 0, p); 222 } 223 FILE_UNUSE(fp, p); 224 } 225 } 226 return 0; 227 } 228 229 /* 230 * The next two functions take care of converting the flock 231 * structure back and forth between Linux and NetBSD format. 232 * The only difference in the structures is the order of 233 * the fields, and the 'whence' value. 234 */ 235 static void 236 bsd_to_linux_flock(bfp, lfp) 237 struct flock *bfp; 238 struct linux_flock *lfp; 239 { 240 241 lfp->l_start = bfp->l_start; 242 lfp->l_len = bfp->l_len; 243 lfp->l_pid = bfp->l_pid; 244 lfp->l_whence = bfp->l_whence; 245 switch (bfp->l_type) { 246 case F_RDLCK: 247 lfp->l_type = LINUX_F_RDLCK; 248 break; 249 case F_UNLCK: 250 lfp->l_type = LINUX_F_UNLCK; 251 break; 252 case F_WRLCK: 253 lfp->l_type = LINUX_F_WRLCK; 254 break; 255 } 256 } 257 258 static void 259 linux_to_bsd_flock(lfp, bfp) 260 struct linux_flock *lfp; 261 struct flock *bfp; 262 { 263 264 bfp->l_start = lfp->l_start; 265 bfp->l_len = lfp->l_len; 266 bfp->l_pid = lfp->l_pid; 267 bfp->l_whence = lfp->l_whence; 268 switch (lfp->l_type) { 269 case LINUX_F_RDLCK: 270 bfp->l_type = F_RDLCK; 271 break; 272 case LINUX_F_UNLCK: 273 bfp->l_type = F_UNLCK; 274 break; 275 case LINUX_F_WRLCK: 276 bfp->l_type = F_WRLCK; 277 break; 278 } 279 } 280 281 /* 282 * Most actions in the fcntl() call are straightforward; simply 283 * pass control to the NetBSD system call. A few commands need 284 * conversions after the actual system call has done its work, 285 * because the flag values and lock structure are different. 286 */ 287 int 288 linux_sys_fcntl(l, v, retval) 289 struct lwp *l; 290 void *v; 291 register_t *retval; 292 { 293 struct linux_sys_fcntl_args /* { 294 syscallarg(int) fd; 295 syscallarg(int) cmd; 296 syscallarg(void *) arg; 297 } */ *uap = v; 298 struct proc *p = l->l_proc; 299 int fd, cmd, error; 300 u_long val; 301 caddr_t arg, sg; 302 struct linux_flock lfl; 303 struct flock *bfp, bfl; 304 struct sys_fcntl_args fca; 305 struct filedesc *fdp; 306 struct file *fp; 307 struct vnode *vp; 308 struct vattr va; 309 const struct cdevsw *cdev; 310 long pgid; 311 struct pgrp *pgrp; 312 struct tty *tp, *(*d_tty) __P((dev_t)); 313 314 fd = SCARG(uap, fd); 315 cmd = SCARG(uap, cmd); 316 arg = (caddr_t) SCARG(uap, arg); 317 318 switch (cmd) { 319 case LINUX_F_DUPFD: 320 cmd = F_DUPFD; 321 break; 322 case LINUX_F_GETFD: 323 cmd = F_GETFD; 324 break; 325 case LINUX_F_SETFD: 326 cmd = F_SETFD; 327 break; 328 case LINUX_F_GETFL: 329 SCARG(&fca, fd) = fd; 330 SCARG(&fca, cmd) = F_GETFL; 331 SCARG(&fca, arg) = arg; 332 if ((error = sys_fcntl(l, &fca, retval))) 333 return error; 334 retval[0] = bsd_to_linux_ioflags(retval[0]); 335 return 0; 336 case LINUX_F_SETFL: { 337 struct file *fp = NULL; 338 339 val = linux_to_bsd_ioflags((unsigned long)SCARG(uap, arg)); 340 /* 341 * Linux seems to have same semantics for sending SIGIO to the 342 * read side of socket, but slighly different semantics 343 * for SIGIO to the write side. Rather than sending the SIGIO 344 * every time it's possible to write (directly) more data, it 345 * only sends SIGIO if last write(2) failed due to insufficient 346 * memory to hold the data. This is compatible enough 347 * with NetBSD semantics to not do anything about the 348 * difference. 349 * 350 * Linux does NOT send SIGIO for pipes. Deal with socketpair 351 * ones and DTYPE_PIPE ones. For these, we don't set 352 * the underlying flags (we don't pass O_ASYNC flag down 353 * to sys_fcntl()), but set the FASYNC flag for file descriptor, 354 * so that F_GETFL would report the ASYNC i/o is on. 355 */ 356 if (val & O_ASYNC) { 357 if (((fp = fd_getfile(p->p_fd, fd)) == NULL)) 358 return (EBADF); 359 360 FILE_USE(fp); 361 362 if (((fp->f_type == DTYPE_SOCKET) && fp->f_data 363 && ((struct socket *)fp->f_data)->so_state & SS_ISAPIPE) 364 || (fp->f_type == DTYPE_PIPE)) 365 val &= ~O_ASYNC; 366 else { 367 /* not a pipe, do not modify anything */ 368 FILE_UNUSE(fp, p); 369 fp = NULL; 370 } 371 } 372 373 SCARG(&fca, fd) = fd; 374 SCARG(&fca, cmd) = F_SETFL; 375 SCARG(&fca, arg) = (caddr_t) val; 376 377 error = sys_fcntl(l, &fca, retval); 378 379 /* Now set the FASYNC flag for pipes */ 380 if (fp) { 381 if (!error) 382 fp->f_flag |= FASYNC; 383 FILE_UNUSE(fp, p); 384 } 385 386 return (error); 387 } 388 case LINUX_F_GETLK: 389 sg = stackgap_init(p, 0); 390 bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp); 391 if ((error = copyin(arg, &lfl, sizeof lfl))) 392 return error; 393 linux_to_bsd_flock(&lfl, &bfl); 394 if ((error = copyout(&bfl, bfp, sizeof bfl))) 395 return error; 396 SCARG(&fca, fd) = fd; 397 SCARG(&fca, cmd) = F_GETLK; 398 SCARG(&fca, arg) = bfp; 399 if ((error = sys_fcntl(l, &fca, retval))) 400 return error; 401 if ((error = copyin(bfp, &bfl, sizeof bfl))) 402 return error; 403 bsd_to_linux_flock(&bfl, &lfl); 404 return copyout(&lfl, arg, sizeof lfl); 405 406 case LINUX_F_SETLK: 407 case LINUX_F_SETLKW: 408 cmd = (cmd == LINUX_F_SETLK ? F_SETLK : F_SETLKW); 409 if ((error = copyin(arg, &lfl, sizeof lfl))) 410 return error; 411 linux_to_bsd_flock(&lfl, &bfl); 412 sg = stackgap_init(p, 0); 413 bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp); 414 if ((error = copyout(&bfl, bfp, sizeof bfl))) 415 return error; 416 arg = (caddr_t)bfp; 417 break; 418 419 case LINUX_F_SETOWN: 420 case LINUX_F_GETOWN: 421 /* 422 * We need to route fcntl() for tty descriptors around normal 423 * fcntl(), since NetBSD tty TIOC{G,S}PGRP semantics is too 424 * restrictive for Linux F_{G,S}ETOWN. For non-tty descriptors, 425 * this is not a problem. 426 */ 427 fdp = p->p_fd; 428 if ((fp = fd_getfile(fdp, fd)) == NULL) 429 return EBADF; 430 FILE_USE(fp); 431 432 /* Check it's a character device vnode */ 433 if (fp->f_type != DTYPE_VNODE 434 || (vp = (struct vnode *)fp->f_data) == NULL 435 || vp->v_type != VCHR) { 436 FILE_UNUSE(fp, p); 437 438 not_tty: 439 /* Not a tty, proceed with common fcntl() */ 440 cmd = cmd == LINUX_F_SETOWN ? F_SETOWN : F_GETOWN; 441 break; 442 } 443 444 error = VOP_GETATTR(vp, &va, p->p_ucred, p); 445 446 FILE_UNUSE(fp, p); 447 448 if (error) 449 return error; 450 451 cdev = cdevsw_lookup(va.va_rdev); 452 if (cdev == NULL) 453 return (ENXIO); 454 d_tty = cdev->d_tty; 455 if (!d_tty || (!(tp = (*d_tty)(va.va_rdev)))) 456 goto not_tty; 457 458 /* set tty pg_id appropriately */ 459 if (cmd == LINUX_F_GETOWN) { 460 retval[0] = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PGID; 461 return 0; 462 } 463 if ((long)arg <= 0) { 464 pgid = -(long)arg; 465 } else { 466 struct proc *p1 = pfind((long)arg); 467 if (p1 == NULL) 468 return (ESRCH); 469 pgid = (long)p1->p_pgrp->pg_id; 470 } 471 pgrp = pgfind(pgid); 472 if (pgrp == NULL || pgrp->pg_session != p->p_session) 473 return EPERM; 474 tp->t_pgrp = pgrp; 475 return 0; 476 477 default: 478 return EOPNOTSUPP; 479 } 480 481 SCARG(&fca, fd) = fd; 482 SCARG(&fca, cmd) = cmd; 483 SCARG(&fca, arg) = arg; 484 485 return sys_fcntl(l, &fca, retval); 486 } 487 488 /* 489 * Convert a NetBSD stat structure to a Linux stat structure. 490 * Only the order of the fields and the padding in the structure 491 * is different. linux_fakedev is a machine-dependent function 492 * which optionally converts device driver major/minor numbers 493 * (XXX horrible, but what can you do against code that compares 494 * things against constant major device numbers? sigh) 495 */ 496 static void 497 bsd_to_linux_stat(bsp, lsp) 498 struct stat *bsp; 499 struct linux_stat *lsp; 500 { 501 502 lsp->lst_dev = linux_fakedev(bsp->st_dev, 0); 503 lsp->lst_ino = bsp->st_ino; 504 lsp->lst_mode = (linux_mode_t)bsp->st_mode; 505 if (bsp->st_nlink >= (1 << 15)) 506 lsp->lst_nlink = (1 << 15) - 1; 507 else 508 lsp->lst_nlink = (linux_nlink_t)bsp->st_nlink; 509 lsp->lst_uid = bsp->st_uid; 510 lsp->lst_gid = bsp->st_gid; 511 lsp->lst_rdev = linux_fakedev(bsp->st_rdev, 1); 512 lsp->lst_size = bsp->st_size; 513 lsp->lst_blksize = bsp->st_blksize; 514 lsp->lst_blocks = bsp->st_blocks; 515 lsp->lst_atime = bsp->st_atime; 516 lsp->lst_mtime = bsp->st_mtime; 517 lsp->lst_ctime = bsp->st_ctime; 518 } 519 520 /* 521 * The stat functions below are plain sailing. stat and lstat are handled 522 * by one function to avoid code duplication. 523 */ 524 int 525 linux_sys_fstat(l, v, retval) 526 struct lwp *l; 527 void *v; 528 register_t *retval; 529 { 530 struct linux_sys_fstat_args /* { 531 syscallarg(int) fd; 532 syscallarg(linux_stat *) sp; 533 } */ *uap = v; 534 struct proc *p = l->l_proc; 535 struct sys___fstat13_args fsa; 536 struct linux_stat tmplst; 537 struct stat *st,tmpst; 538 caddr_t sg; 539 int error; 540 541 sg = stackgap_init(p, 0); 542 543 st = stackgap_alloc(p, &sg, sizeof (struct stat)); 544 545 SCARG(&fsa, fd) = SCARG(uap, fd); 546 SCARG(&fsa, sb) = st; 547 548 if ((error = sys___fstat13(l, &fsa, retval))) 549 return error; 550 551 if ((error = copyin(st, &tmpst, sizeof tmpst))) 552 return error; 553 554 bsd_to_linux_stat(&tmpst, &tmplst); 555 556 if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst))) 557 return error; 558 559 return 0; 560 } 561 562 static int 563 linux_stat1(l, v, retval, dolstat) 564 struct lwp *l; 565 void *v; 566 register_t *retval; 567 int dolstat; 568 { 569 struct sys___stat13_args sa; 570 struct linux_stat tmplst; 571 struct stat *st, tmpst; 572 struct proc *p = l->l_proc; 573 caddr_t sg; 574 int error; 575 struct linux_sys_stat_args *uap = v; 576 577 sg = stackgap_init(p, 0); 578 st = stackgap_alloc(p, &sg, sizeof (struct stat)); 579 if (dolstat) 580 CHECK_ALT_SYMLINK(p, &sg, SCARG(uap, path)); 581 else 582 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 583 584 SCARG(&sa, ub) = st; 585 SCARG(&sa, path) = SCARG(uap, path); 586 587 if ((error = (dolstat ? sys___lstat13(l, &sa, retval) : 588 sys___stat13(l, &sa, retval)))) 589 return error; 590 591 if ((error = copyin(st, &tmpst, sizeof tmpst))) 592 return error; 593 594 bsd_to_linux_stat(&tmpst, &tmplst); 595 596 if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst))) 597 return error; 598 599 return 0; 600 } 601 602 int 603 linux_sys_stat(l, v, retval) 604 struct lwp *l; 605 void *v; 606 register_t *retval; 607 { 608 struct linux_sys_stat_args /* { 609 syscallarg(const char *) path; 610 syscallarg(struct linux_stat *) sp; 611 } */ *uap = v; 612 613 return linux_stat1(l, uap, retval, 0); 614 } 615 616 /* Note: this is "newlstat" in the Linux sources */ 617 /* (we don't bother with the old lstat currently) */ 618 int 619 linux_sys_lstat(l, v, retval) 620 struct lwp *l; 621 void *v; 622 register_t *retval; 623 { 624 struct linux_sys_lstat_args /* { 625 syscallarg(const char *) path; 626 syscallarg(struct linux_stat *) sp; 627 } */ *uap = v; 628 629 return linux_stat1(l, uap, retval, 1); 630 } 631 632 /* 633 * The following syscalls are mostly here because of the alternate path check. 634 */ 635 int 636 linux_sys_access(l, v, retval) 637 struct lwp *l; 638 void *v; 639 register_t *retval; 640 { 641 struct linux_sys_access_args /* { 642 syscallarg(const char *) path; 643 syscallarg(int) flags; 644 } */ *uap = v; 645 struct proc *p = l->l_proc; 646 caddr_t sg = stackgap_init(p, 0); 647 648 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 649 650 return sys_access(l, uap, retval); 651 } 652 653 int 654 linux_sys_unlink(l, v, retval) 655 struct lwp *l; 656 void *v; 657 register_t *retval; 658 659 { 660 struct linux_sys_unlink_args /* { 661 syscallarg(const char *) path; 662 } */ *uap = v; 663 struct proc *p = l->l_proc; 664 caddr_t sg = stackgap_init(p, 0); 665 int error; 666 struct nameidata nd; 667 668 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 669 670 error = sys_unlink(l, uap, retval); 671 if (error != EPERM) 672 return (error); 673 674 /* 675 * Linux returns EISDIR if unlink(2) is called on a directory. 676 * We return EPERM in such cases. To emulate correct behaviour, 677 * check if the path points to directory and return EISDIR if this 678 * is the case. 679 */ 680 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 681 SCARG(uap, path), p); 682 if (namei(&nd) == 0) { 683 struct stat sb; 684 685 if (vn_stat(nd.ni_vp, &sb, p) == 0 686 && S_ISDIR(sb.st_mode)) 687 error = EISDIR; 688 689 vput(nd.ni_vp); 690 } 691 692 return (error); 693 } 694 695 int 696 linux_sys_chdir(l, v, retval) 697 struct lwp *l; 698 void *v; 699 register_t *retval; 700 { 701 struct linux_sys_chdir_args /* { 702 syscallarg(const char *) path; 703 } */ *uap = v; 704 struct proc *p = l->l_proc; 705 caddr_t sg = stackgap_init(p, 0); 706 707 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 708 709 return sys_chdir(l, uap, retval); 710 } 711 712 int 713 linux_sys_mknod(l, v, retval) 714 struct lwp *l; 715 void *v; 716 register_t *retval; 717 { 718 struct linux_sys_mknod_args /* { 719 syscallarg(const char *) path; 720 syscallarg(int) mode; 721 syscallarg(int) dev; 722 } */ *uap = v; 723 struct proc *p = l->l_proc; 724 caddr_t sg = stackgap_init(p, 0); 725 726 CHECK_ALT_CREAT(p, &sg, SCARG(uap, path)); 727 728 /* 729 * BSD handles FIFOs separately 730 */ 731 if (SCARG(uap, mode) & S_IFIFO) { 732 struct sys_mkfifo_args bma; 733 734 SCARG(&bma, path) = SCARG(uap, path); 735 SCARG(&bma, mode) = SCARG(uap, mode); 736 return sys_mkfifo(l, &bma, retval); 737 } else { 738 struct sys_mknod_args bma; 739 740 SCARG(&bma, path) = SCARG(uap, path); 741 SCARG(&bma, mode) = SCARG(uap, mode); 742 /* 743 * Linux device numbers uses 8 bits for minor and 8 bits 744 * for major. Due to how we map our major and minor, 745 * this just fints into our dev_t. Just mask off the 746 * upper 16bit to remove any random junk. 747 */ 748 SCARG(&bma, dev) = SCARG(uap, dev) & 0xffff; 749 return sys_mknod(l, &bma, retval); 750 } 751 } 752 753 int 754 linux_sys_chmod(l, v, retval) 755 struct lwp *l; 756 void *v; 757 register_t *retval; 758 { 759 struct linux_sys_chmod_args /* { 760 syscallarg(const char *) path; 761 syscallarg(int) mode; 762 } */ *uap = v; 763 struct proc *p = l->l_proc; 764 caddr_t sg = stackgap_init(p, 0); 765 766 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 767 768 return sys_chmod(l, uap, retval); 769 } 770 771 #if defined(__i386__) || defined(__m68k__) || defined(__arm__) 772 int 773 linux_sys_chown16(l, v, retval) 774 struct lwp *l; 775 void *v; 776 register_t *retval; 777 { 778 struct linux_sys_chown16_args /* { 779 syscallarg(const char *) path; 780 syscallarg(int) uid; 781 syscallarg(int) gid; 782 } */ *uap = v; 783 struct proc *p = l->l_proc; 784 struct sys___posix_chown_args bca; 785 caddr_t sg = stackgap_init(p, 0); 786 787 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 788 789 SCARG(&bca, path) = SCARG(uap, path); 790 SCARG(&bca, uid) = ((linux_uid_t)SCARG(uap, uid) == (linux_uid_t)-1) ? 791 (uid_t)-1 : SCARG(uap, uid); 792 SCARG(&bca, gid) = ((linux_gid_t)SCARG(uap, gid) == (linux_gid_t)-1) ? 793 (gid_t)-1 : SCARG(uap, gid); 794 795 return sys___posix_chown(l, &bca, retval); 796 } 797 798 int 799 linux_sys_fchown16(l, v, retval) 800 struct lwp *l; 801 void *v; 802 register_t *retval; 803 { 804 struct linux_sys_fchown16_args /* { 805 syscallarg(int) fd; 806 syscallarg(int) uid; 807 syscallarg(int) gid; 808 } */ *uap = v; 809 struct sys___posix_fchown_args bfa; 810 811 SCARG(&bfa, fd) = SCARG(uap, fd); 812 SCARG(&bfa, uid) = ((linux_uid_t)SCARG(uap, uid) == (linux_uid_t)-1) ? 813 (uid_t)-1 : SCARG(uap, uid); 814 SCARG(&bfa, gid) = ((linux_gid_t)SCARG(uap, gid) == (linux_gid_t)-1) ? 815 (gid_t)-1 : SCARG(uap, gid); 816 817 return sys___posix_fchown(l, &bfa, retval); 818 } 819 820 int 821 linux_sys_lchown16(l, v, retval) 822 struct lwp *l; 823 void *v; 824 register_t *retval; 825 { 826 struct linux_sys_lchown16_args /* { 827 syscallarg(char *) path; 828 syscallarg(int) uid; 829 syscallarg(int) gid; 830 } */ *uap = v; 831 struct proc *p = l->l_proc; 832 struct sys___posix_lchown_args bla; 833 caddr_t sg = stackgap_init(p, 0); 834 835 CHECK_ALT_SYMLINK(p, &sg, SCARG(uap, path)); 836 837 SCARG(&bla, path) = SCARG(uap, path); 838 SCARG(&bla, uid) = ((linux_uid_t)SCARG(uap, uid) == (linux_uid_t)-1) ? 839 (uid_t)-1 : SCARG(uap, uid); 840 SCARG(&bla, gid) = ((linux_gid_t)SCARG(uap, gid) == (linux_gid_t)-1) ? 841 (gid_t)-1 : SCARG(uap, gid); 842 843 return sys___posix_lchown(l, &bla, retval); 844 } 845 #endif /* __i386__ || __m68k__ || __arm__ */ 846 #if defined (__i386__) || defined (__m68k__) || \ 847 defined (__powerpc__) || defined (__mips__) || defined(__arm__) 848 int 849 linux_sys_chown(l, v, retval) 850 struct lwp *l; 851 void *v; 852 register_t *retval; 853 { 854 struct linux_sys_chown_args /* { 855 syscallarg(char *) path; 856 syscallarg(int) uid; 857 syscallarg(int) gid; 858 } */ *uap = v; 859 struct proc *p = l->l_proc; 860 caddr_t sg = stackgap_init(p, 0); 861 862 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 863 864 return sys___posix_chown(l, uap, retval); 865 } 866 867 int 868 linux_sys_lchown(l, v, retval) 869 struct lwp *l; 870 void *v; 871 register_t *retval; 872 { 873 struct linux_sys_lchown_args /* { 874 syscallarg(char *) path; 875 syscallarg(int) uid; 876 syscallarg(int) gid; 877 } */ *uap = v; 878 struct proc *p = l->l_proc; 879 caddr_t sg = stackgap_init(p, 0); 880 881 CHECK_ALT_SYMLINK(p, &sg, SCARG(uap, path)); 882 883 return sys___posix_lchown(l, uap, retval); 884 } 885 #endif /* __i386__ || __m68k__ || __powerpc__ || __mips__ || __arm__ */ 886 887 int 888 linux_sys_rename(l, v, retval) 889 struct lwp *l; 890 void *v; 891 register_t *retval; 892 { 893 struct linux_sys_rename_args /* { 894 syscallarg(const char *) from; 895 syscallarg(const char *) to; 896 } */ *uap = v; 897 struct proc *p = l->l_proc; 898 caddr_t sg = stackgap_init(p, 0); 899 900 CHECK_ALT_EXIST(p, &sg, SCARG(uap, from)); 901 CHECK_ALT_CREAT(p, &sg, SCARG(uap, to)); 902 903 return sys___posix_rename(l, uap, retval); 904 } 905 906 int 907 linux_sys_mkdir(l, v, retval) 908 struct lwp *l; 909 void *v; 910 register_t *retval; 911 { 912 struct linux_sys_mkdir_args /* { 913 syscallarg(const char *) path; 914 syscallarg(int) mode; 915 } */ *uap = v; 916 struct proc *p = l->l_proc; 917 caddr_t sg = stackgap_init(p, 0); 918 919 CHECK_ALT_CREAT(p, &sg, SCARG(uap, path)); 920 921 return sys_mkdir(l, uap, retval); 922 } 923 924 int 925 linux_sys_rmdir(l, v, retval) 926 struct lwp *l; 927 void *v; 928 register_t *retval; 929 { 930 struct linux_sys_rmdir_args /* { 931 syscallarg(const char *) path; 932 } */ *uap = v; 933 struct proc *p = l->l_proc; 934 caddr_t sg = stackgap_init(p, 0); 935 936 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 937 938 return sys_rmdir(l, uap, retval); 939 } 940 941 int 942 linux_sys_symlink(l, v, retval) 943 struct lwp *l; 944 void *v; 945 register_t *retval; 946 { 947 struct linux_sys_symlink_args /* { 948 syscallarg(const char *) path; 949 syscallarg(const char *) to; 950 } */ *uap = v; 951 struct proc *p = l->l_proc; 952 caddr_t sg = stackgap_init(p, 0); 953 954 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 955 CHECK_ALT_CREAT(p, &sg, SCARG(uap, to)); 956 957 return sys_symlink(l, uap, retval); 958 } 959 960 int 961 linux_sys_link(l, v, retval) 962 struct lwp *l; 963 void *v; 964 register_t *retval; 965 { 966 struct linux_sys_link_args /* { 967 syscallarg(const char *) path; 968 syscallarg(const char *) link; 969 } */ *uap = v; 970 struct proc *p = l->l_proc; 971 caddr_t sg = stackgap_init(p, 0); 972 973 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 974 CHECK_ALT_CREAT(p, &sg, SCARG(uap, link)); 975 976 return sys_link(l, uap, retval); 977 } 978 979 int 980 linux_sys_readlink(l, v, retval) 981 struct lwp *l; 982 void *v; 983 register_t *retval; 984 { 985 struct linux_sys_readlink_args /* { 986 syscallarg(const char *) name; 987 syscallarg(char *) buf; 988 syscallarg(int) count; 989 } */ *uap = v; 990 struct proc *p = l->l_proc; 991 caddr_t sg = stackgap_init(p, 0); 992 993 CHECK_ALT_SYMLINK(p, &sg, SCARG(uap, name)); 994 995 return sys_readlink(l, uap, retval); 996 } 997 998 int 999 linux_sys_truncate(l, v, retval) 1000 struct lwp *l; 1001 void *v; 1002 register_t *retval; 1003 { 1004 struct linux_sys_truncate_args /* { 1005 syscallarg(const char *) path; 1006 syscallarg(long) length; 1007 } */ *uap = v; 1008 struct proc *p = l->l_proc; 1009 caddr_t sg = stackgap_init(p, 0); 1010 1011 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 1012 1013 return compat_43_sys_truncate(l, uap, retval); 1014 } 1015 1016 /* 1017 * This is just fsync() for now (just as it is in the Linux kernel) 1018 * Note: this is not implemented under Linux on Alpha and Arm 1019 * but should still be defined in our syscalls.master. 1020 * (syscall #148 on the arm) 1021 */ 1022 int 1023 linux_sys_fdatasync(l, v, retval) 1024 struct lwp *l; 1025 void *v; 1026 register_t *retval; 1027 { 1028 #ifdef notdef 1029 struct linux_sys_fdatasync_args /* { 1030 syscallarg(int) fd; 1031 } */ *uap = v; 1032 #endif 1033 return sys_fsync(l, v, retval); 1034 } 1035 1036 /* 1037 * pread(2). 1038 */ 1039 int 1040 linux_sys_pread(l, v, retval) 1041 struct lwp *l; 1042 void *v; 1043 register_t *retval; 1044 { 1045 struct linux_sys_pread_args /* { 1046 syscallarg(int) fd; 1047 syscallarg(void *) buf; 1048 syscallarg(size_t) nbyte; 1049 syscallarg(linux_off_t) offset; 1050 } */ *uap = v; 1051 struct sys_pread_args pra; 1052 1053 SCARG(&pra, fd) = SCARG(uap, fd); 1054 SCARG(&pra, buf) = SCARG(uap, buf); 1055 SCARG(&pra, nbyte) = SCARG(uap, nbyte); 1056 SCARG(&pra, offset) = SCARG(uap, offset); 1057 1058 return sys_pread(l, &pra, retval); 1059 } 1060 1061 /* 1062 * pwrite(2). 1063 */ 1064 int 1065 linux_sys_pwrite(l, v, retval) 1066 struct lwp *l; 1067 void *v; 1068 register_t *retval; 1069 { 1070 struct linux_sys_pwrite_args /* { 1071 syscallarg(int) fd; 1072 syscallarg(void *) buf; 1073 syscallarg(size_t) nbyte; 1074 syscallarg(linux_off_t) offset; 1075 } */ *uap = v; 1076 struct sys_pwrite_args pra; 1077 1078 SCARG(&pra, fd) = SCARG(uap, fd); 1079 SCARG(&pra, buf) = SCARG(uap, buf); 1080 SCARG(&pra, nbyte) = SCARG(uap, nbyte); 1081 SCARG(&pra, offset) = SCARG(uap, offset); 1082 1083 return sys_pwrite(l, &pra, retval); 1084 }
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