1 /* $NetBSD: linux_break.c,v 1.11 1995/08/14 01:27:53 mycroft 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 /* 35 * Linux compatibility module. Try to deal with various Linux system calls. 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/namei.h> 41 #include <sys/proc.h> 42 #include <sys/dir.h> 43 #include <sys/file.h> 44 #include <sys/stat.h> 45 #include <sys/filedesc.h> 46 #include <sys/ioctl.h> 47 #include <sys/kernel.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/mman.h> 51 #include <sys/mount.h> 52 #include <sys/ptrace.h> 53 #include <sys/resource.h> 54 #include <sys/resourcevar.h> 55 #include <sys/signal.h> 56 #include <sys/signalvar.h> 57 #include <sys/socket.h> 58 #include <sys/time.h> 59 #include <sys/times.h> 60 #include <sys/vnode.h> 61 #include <sys/uio.h> 62 #include <sys/wait.h> 63 #include <sys/utsname.h> 64 #include <sys/unistd.h> 65 66 #include <sys/syscallargs.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_param.h> 70 71 #include <compat/linux/linux_types.h> 72 #include <compat/linux/linux_fcntl.h> 73 #include <compat/linux/linux_mmap.h> 74 #include <compat/linux/linux_signal.h> 75 #include <compat/linux/linux_syscallargs.h> 76 #include <compat/linux/linux_util.h> 77 #include <compat/linux/linux_dirent.h> 78 79 /* 80 * The information on a terminated (or stopped) process needs 81 * to be converted in order for Linux binaries to get a valid signal 82 * number out of it. 83 */ 84 static int 85 bsd_to_linux_wstat(status) 86 int *status; 87 { 88 if (WIFSIGNALED(*status)) 89 *status = (*status & ~0177) | 90 bsd_to_linux_sig(WTERMSIG(*status)); 91 else if (WIFSTOPPED(*status)) 92 *status = (*status & ~0xff00) | 93 (bsd_to_linux_sig(WSTOPSIG(*status)) << 8); 94 } 95 96 /* 97 * waitpid(2). Passed on to the NetBSD call, surrounded by code to 98 * reserve some space for a NetBSD-style wait status, and converting 99 * it to what Linux wants. 100 */ 101 int 102 linux_waitpid(p, uap, retval) 103 struct proc *p; 104 struct linux_waitpid_args /* { 105 syscallarg(int) pid; 106 syscallarg(int *) status; 107 syscallarg(int) options; 108 } */ *uap; 109 register_t *retval; 110 { 111 struct wait4_args w4a; 112 int error, *status, tstat; 113 caddr_t sg; 114 115 sg = stackgap_init(p->p_emul); 116 status = (int *) stackgap_alloc(&sg, sizeof status); 117 118 SCARG(&w4a, pid) = SCARG(uap, pid); 119 SCARG(&w4a, status) = status; 120 SCARG(&w4a, options) = SCARG(uap, options); 121 SCARG(&w4a, rusage) = NULL; 122 123 if ((error = wait4(p, &w4a, retval))) 124 return error; 125 126 if ((error = copyin(status, &tstat, sizeof tstat))) 127 return error; 128 129 bsd_to_linux_wstat(&tstat); 130 131 return copyout(&tstat, SCARG(uap, status), sizeof tstat); 132 } 133 134 /* 135 * This is very much the same as waitpid() 136 */ 137 int 138 linux_wait4(p, uap, retval) 139 struct proc *p; 140 struct linux_wait4_args /* { 141 syscallarg(int) pid; 142 syscallarg(int *) status; 143 syscallarg(int) options; 144 syscallarg(struct rusage *) rusage; 145 } */ *uap; 146 register_t *retval; 147 { 148 struct wait4_args w4a; 149 int error, *status, tstat; 150 caddr_t sg; 151 152 sg = stackgap_init(p->p_emul); 153 status = (int *) stackgap_alloc(&sg, sizeof status); 154 155 SCARG(&w4a, pid) = SCARG(uap, pid); 156 SCARG(&w4a, status) = status; 157 SCARG(&w4a, options) = SCARG(uap, options); 158 SCARG(&w4a, rusage) = SCARG(uap, rusage); 159 160 if ((error = wait4(p, &w4a, retval))) 161 return error; 162 163 if ((error = copyin(status, &tstat, sizeof tstat))) 164 return error; 165 166 bsd_to_linux_wstat(&tstat); 167 168 return copyout(&tstat, SCARG(uap, status), sizeof tstat); 169 } 170 171 /* 172 * This is the old brk(2) call. I don't think anything in the Linux 173 * world uses this anymore 174 */ 175 int 176 linux_break(p, uap, retval) 177 struct proc *p; 178 struct linux_brk_args /* { 179 syscallarg(char *) nsize; 180 } */ *uap; 181 register_t *retval; 182 { 183 return ENOSYS; 184 } 185 186 /* 187 * Linux brk(2). The check if the new address is >= the old one is 188 * done in the kernel in Linux. NetBSD does it in the library. 189 */ 190 int 191 linux_brk(p, uap, retval) 192 struct proc *p; 193 struct linux_brk_args /* { 194 syscallarg(char *) nsize; 195 } */ *uap; 196 register_t *retval; 197 { 198 char *nbrk = SCARG(uap, nsize); 199 struct obreak_args oba; 200 struct vmspace *vm = p->p_vmspace; 201 int error = 0; 202 caddr_t oldbrk, newbrk; 203 204 oldbrk = vm->vm_daddr + ctob(vm->vm_dsize); 205 /* 206 * XXX inconsistent.. Linux always returns at least the old 207 * brk value, but it will be page-aligned if this fails, 208 * and possibly not page aligned if it succeeds (the user 209 * supplied pointer is returned). 210 */ 211 SCARG(&oba, nsize) = nbrk; 212 213 if ((caddr_t) nbrk > vm->vm_daddr && obreak(p, &oba, retval) == 0) 214 retval[0] = (register_t) nbrk; 215 else 216 retval[0] = (register_t) oldbrk; 217 218 return 0; 219 } 220 221 /* 222 * I wonder why Linux has gettimeofday() _and_ time().. Still, we 223 * need to deal with it. 224 */ 225 int 226 linux_time(p, uap, retval) 227 struct proc *p; 228 struct linux_time_args /* { 229 linux_time_t *t; 230 } */ *uap; 231 register_t *retval; 232 { 233 struct timeval atv; 234 linux_time_t tt; 235 int error; 236 237 microtime(&atv); 238 239 tt = atv.tv_sec; 240 if (SCARG(uap, t) && (error = copyout(&tt, SCARG(uap, t), sizeof tt))) 241 return error; 242 243 retval[0] = tt; 244 return 0; 245 } 246 247 /* 248 * Convert BSD statfs structure to Linux statfs structure. 249 * The Linux structure has less fields, and it also wants 250 * the length of a name in a dir entry in a field, which 251 * we fake (probably the wrong way). 252 */ 253 static void 254 bsd_to_linux_statfs(bsp, lsp) 255 struct statfs *bsp; 256 struct linux_statfs *lsp; 257 { 258 lsp->l_ftype = bsp->f_type; 259 lsp->l_fbsize = bsp->f_bsize; 260 lsp->l_fblocks = bsp->f_blocks; 261 lsp->l_fbfree = bsp->f_bfree; 262 lsp->l_fbavail = bsp->f_bavail; 263 lsp->l_ffiles = bsp->f_files; 264 lsp->l_fffree = bsp->f_ffree; 265 lsp->l_ffsid.val[0] = bsp->f_fsid.val[0]; 266 lsp->l_ffsid.val[1] = bsp->f_fsid.val[1]; 267 lsp->l_fnamelen = MAXNAMLEN; /* XXX */ 268 } 269 270 /* 271 * Implement the fs stat functions. Straightforward. 272 */ 273 int 274 linux_statfs(p, uap, retval) 275 struct proc *p; 276 struct linux_statfs_args /* { 277 syscallarg(char *) path; 278 syscallarg(struct linux_statfs *) sp; 279 } */ *uap; 280 register_t *retval; 281 { 282 struct statfs btmp, *bsp; 283 struct linux_statfs ltmp; 284 struct statfs_args bsa; 285 caddr_t sg; 286 int error; 287 288 sg = stackgap_init(p->p_emul); 289 bsp = (struct statfs *) stackgap_alloc(&sg, sizeof (struct statfs)); 290 291 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 292 293 SCARG(&bsa, path) = SCARG(uap, path); 294 SCARG(&bsa, buf) = bsp; 295 296 if ((error = statfs(p, &bsa, retval))) 297 return error; 298 299 if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp))) 300 return error; 301 302 bsd_to_linux_statfs(&btmp, <mp); 303 304 return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp); 305 } 306 307 int 308 linux_fstatfs(p, uap, retval) 309 struct proc *p; 310 struct linux_fstatfs_args /* { 311 syscallarg(int) fd; 312 syscallarg(struct linux_statfs *) sp; 313 } */ *uap; 314 register_t *retval; 315 { 316 struct statfs btmp, *bsp; 317 struct linux_statfs ltmp; 318 struct fstatfs_args bsa; 319 caddr_t sg; 320 int error; 321 322 sg = stackgap_init(p->p_emul); 323 bsp = (struct statfs *) stackgap_alloc(&sg, sizeof (struct statfs)); 324 325 SCARG(&bsa, fd) = SCARG(uap, fd); 326 SCARG(&bsa, buf) = bsp; 327 328 if ((error = statfs(p, &bsa, retval))) 329 return error; 330 331 if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp))) 332 return error; 333 334 bsd_to_linux_statfs(&btmp, <mp); 335 336 return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp); 337 } 338 339 /* 340 * uname(). Just copy the info from the various strings stored in the 341 * kernel, and put it in the Linux utsname structure. That structure 342 * is almost the same as the NetBSD one, only it has fields 65 characters 343 * long, and an extra domainname field. 344 */ 345 int 346 linux_uname(p, uap, retval) 347 struct proc *p; 348 struct linux_uname_args /* { 349 syscallarg(struct linux_utsname *) up; 350 } */ *uap; 351 register_t *retval; 352 { 353 extern char ostype[], osrelease[], version[], hostname[], domainname[]; 354 extern char machine[]; 355 struct linux_utsname tluts; 356 int len; 357 char *cp; 358 359 strncpy(tluts.l_sysname, ostype, sizeof (tluts.l_sysname)); 360 strncpy(tluts.l_nodename, hostname, sizeof (tluts.l_nodename)); 361 strncpy(tluts.l_release, osrelease, sizeof (tluts.l_release)); 362 strncpy(tluts.l_machine, machine, sizeof (tluts.l_machine)); 363 strncpy(tluts.l_domainname, domainname, sizeof (tluts.l_domainname)); 364 strncpy(tluts.l_version, version, sizeof (tluts.l_version)); 365 366 /* This part taken from the the uname() in libc */ 367 len = sizeof (tluts.l_version); 368 for (cp = tluts.l_version; len--; ++cp) 369 if (*cp == '\n' || *cp == '\t') 370 if (len > 1) 371 *cp = ' '; 372 else 373 *cp = '\0'; 374 375 return copyout(&tluts, SCARG(uap, up), sizeof tluts); 376 } 377 378 /* 379 * Linux wants to pass everything to a syscall in registers. However, 380 * mmap() has 6 of them. Oops: out of register error. They just pass 381 * everything in a structure. 382 */ 383 int 384 linux_mmap(p, uap, retval) 385 struct proc *p; 386 struct linux_mmap_args /* { 387 syscallarg(struct linux_mmap *) lmp; 388 } */ *uap; 389 register_t *retval; 390 { 391 struct linux_mmap lmap; 392 struct mmap_args cma; 393 int error, flags; 394 395 if ((error = copyin(SCARG(uap, lmp), &lmap, sizeof lmap))) 396 return error; 397 398 flags = 0; 399 flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_SHARED, MAP_SHARED); 400 flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_PRIVATE, MAP_PRIVATE); 401 flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_FIXED, MAP_FIXED); 402 flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_ANON, MAP_ANON); 403 404 SCARG(&cma,addr) = lmap.lm_addr; 405 SCARG(&cma,len) = lmap.lm_len; 406 SCARG(&cma,prot) = lmap.lm_prot; 407 SCARG(&cma,flags) = flags; 408 SCARG(&cma,fd) = lmap.lm_fd; 409 SCARG(&cma,pad) = 0; 410 SCARG(&cma,pos) = lmap.lm_pos; 411 412 return mmap(p, &cma, retval); 413 } 414 415 /* 416 * Linux doesn't use the retval[1] value to determine whether 417 * we are the child or parent. 418 */ 419 int 420 linux_fork(p, uap, retval) 421 struct proc *p; 422 void *uap; 423 register_t *retval; 424 { 425 int error; 426 427 if ((error = fork(p, uap, retval))) 428 return error; 429 430 if (retval[1] == 1) 431 retval[0] = 0; 432 433 return 0; 434 } 435 436 /* 437 * This code is partly stolen from src/lib/libc/compat-43/times.c 438 * XXX - CLK_TCK isn't declared in /sys, just in <time.h>, done here 439 */ 440 441 #define CLK_TCK 100 442 #define CONVTCK(r) (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK)) 443 444 int 445 linux_times(p, uap, retval) 446 struct proc *p; 447 struct linux_times_args /* { 448 syscallarg(struct times *) tms; 449 } */ *uap; 450 register_t *retval; 451 { 452 struct timeval t; 453 struct linux_tms ltms; 454 struct rusage ru; 455 int error, s; 456 457 calcru(p, &ru.ru_utime, &ru.ru_stime, NULL); 458 ltms.ltms_utime = CONVTCK(ru.ru_utime); 459 ltms.ltms_stime = CONVTCK(ru.ru_stime); 460 461 ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime); 462 ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime); 463 464 if ((error = copyout(<ms, SCARG(uap, tms), sizeof ltms))) 465 return error; 466 467 s = splclock(); 468 timersub(&time, &boottime, &t); 469 splx(s); 470 471 retval[0] = ((linux_clock_t)(CONVTCK(t))); 472 return 0; 473 } 474 475 /* 476 * NetBSD passes fd[0] in retval[0], and fd[1] in retval[1]. 477 * Linux directly passes the pointer. 478 */ 479 int 480 linux_pipe(p, uap, retval) 481 struct proc *p; 482 struct linux_pipe_args /* { 483 syscallarg(int *) pfds; 484 } */ *uap; 485 register_t *retval; 486 { 487 int error; 488 489 if ((error = pipe(p, 0, retval))) 490 return error; 491 492 /* Assumes register_t is an int */ 493 494 if ((error = copyout(retval, SCARG(uap, pfds), 2 * sizeof (int)))) 495 return error; 496 497 retval[0] = 0; 498 return 0; 499 } 500 501 /* 502 * Alarm. This is a libc call which used setitimer(2) in NetBSD. 503 * Fiddle with the timers to make it work. 504 */ 505 int 506 linux_alarm(p, uap, retval) 507 struct proc *p; 508 struct linux_alarm_args /* { 509 syscallarg(unsigned int) secs; 510 } */ *uap; 511 register_t *retval; 512 { 513 int error, s; 514 struct itimerval *itp, it; 515 516 itp = &p->p_realtimer; 517 s = splclock(); 518 /* 519 * Clear any pending timer alarms. 520 */ 521 untimeout(realitexpire, p); 522 timerclear(&itp->it_interval); 523 if (timerisset(&itp->it_value) && 524 timercmp(&itp->it_value, &time, >)) 525 timersub(&itp->it_value, &time, &itp->it_value); 526 /* 527 * Return how many seconds were left (rounded up) 528 */ 529 retval[0] = itp->it_value.tv_sec; 530 if (itp->it_value.tv_usec) 531 retval[0]++; 532 533 /* 534 * alarm(0) just resets the timer. 535 */ 536 if (SCARG(uap, secs) == 0) { 537 timerclear(&itp->it_value); 538 splx(s); 539 return 0; 540 } 541 542 /* 543 * Check the new alarm time for sanity, and set it. 544 */ 545 timerclear(&it.it_interval); 546 it.it_value.tv_sec = SCARG(uap, secs); 547 it.it_value.tv_usec = 0; 548 if (itimerfix(&it.it_value) || itimerfix(&it.it_interval)) { 549 splx(s); 550 return (EINVAL); 551 } 552 553 if (timerisset(&it.it_value)) { 554 timeradd(&it.it_value, &time, &it.it_value); 555 timeout(realitexpire, p, hzto(&it.it_value)); 556 } 557 p->p_realtimer = it; 558 splx(s); 559 560 return 0; 561 } 562 563 /* 564 * utime(). Do conversion to things that utimes() understands, 565 * and pass it on. 566 */ 567 int 568 linux_utime(p, uap, retval) 569 struct proc *p; 570 struct linux_utime_args /* { 571 syscallarg(char *) path; 572 syscallarg(struct linux_utimbuf *)times; 573 } */ *uap; 574 register_t *retval; 575 { 576 caddr_t sg; 577 int error; 578 struct utimes_args ua; 579 struct timeval tv[2], *tvp; 580 struct linux_utimbuf lut; 581 582 sg = stackgap_init(p->p_emul); 583 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 584 585 SCARG(&ua, path) = SCARG(uap, path); 586 587 if (SCARG(uap, times) != NULL) { 588 if ((error = copyin(SCARG(uap, times), &lut, sizeof lut))) 589 return error; 590 tv[0].tv_usec = tv[1].tv_usec = 0; 591 tv[0].tv_sec = lut.l_actime; 592 tv[1].tv_sec = lut.l_modtime; 593 tvp = (struct timeval *) stackgap_alloc(&sg, sizeof(tv)); 594 if ((error = copyout(tv, tvp, sizeof tv))) 595 return error; 596 SCARG(&ua, tptr) = tvp; 597 } 598 else 599 SCARG(&ua, tptr) = NULL; 600 601 return utimes(p, uap, retval); 602 } 603 604 /* 605 * Linux 'readdir' call. This code is mostly taken from the 606 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 607 * an attempt has been made to keep it a little cleaner (failing 608 * miserably, because of the cruft needed if count 1 is passed). 609 * 610 * Read in BSD-style entries, convert them, and copy them out. 611 * Note that the Linux d_reclen is actually the name length, 612 * and d_off is the reclen. 613 * 614 * Note that this doesn't handle union-mounted filesystems. 615 */ 616 int 617 linux_readdir(p, uap, retval) 618 struct proc *p; 619 struct linux_readdir_args /* { 620 syscallarg(int) fd; 621 syscallarg(struct linux_dirent *) dent; 622 syscallarg(unsigned int) count; 623 } */ *uap; 624 register_t *retval; 625 { 626 register struct dirent *bdp; 627 struct vnode *vp; 628 caddr_t inp, buf; /* BSD-format */ 629 int len, reclen; /* BSD-format */ 630 caddr_t outp; /* Linux-format */ 631 int resid, linuxreclen; /* Linux-format */ 632 struct file *fp; 633 struct uio auio; 634 struct iovec aiov; 635 struct linux_dirent idb; 636 off_t off; /* true file offset */ 637 linux_off_t soff; /* Linux file offset */ 638 int buflen, error, eofflag, nbytes, justone; 639 struct vattr va; 640 641 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 642 return (error); 643 644 if ((fp->f_flag & FREAD) == 0) 645 return (EBADF); 646 647 vp = (struct vnode *)fp->f_data; 648 649 if (vp->v_type != VDIR) /* XXX vnode readdir op should do this */ 650 return (EINVAL); 651 652 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p))) 653 return error; 654 655 nbytes = SCARG(uap, count); 656 if (nbytes == 1) { /* Need this for older Linux libs, apparently */ 657 nbytes = sizeof (struct linux_dirent); 658 buflen = max(va.va_blocksize, nbytes); 659 justone = 1; 660 } else { 661 buflen = min(MAXBSIZE, nbytes); 662 justone = 0; 663 } 664 buf = malloc(buflen, M_TEMP, M_WAITOK); 665 VOP_LOCK(vp); 666 off = fp->f_offset; 667 again: 668 aiov.iov_base = buf; 669 aiov.iov_len = buflen; 670 auio.uio_iov = &aiov; 671 auio.uio_iovcnt = 1; 672 auio.uio_rw = UIO_READ; 673 auio.uio_segflg = UIO_SYSSPACE; 674 auio.uio_procp = p; 675 auio.uio_resid = buflen; 676 auio.uio_offset = off; 677 /* 678 * First we read into the malloc'ed buffer, then 679 * we massage it into user space, one record at a time. 680 */ 681 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, (u_long *)0, 0); 682 if (error) 683 goto out; 684 685 inp = buf; 686 outp = (caddr_t) SCARG(uap, dent); 687 resid = nbytes; 688 if ((len = buflen - auio.uio_resid) == 0) 689 goto eof; 690 691 for (; len > 0; len -= reclen) { 692 bdp = (struct dirent *)inp; 693 reclen = bdp->d_reclen; 694 if (reclen & 3) 695 panic("linux_readdir"); 696 off += reclen; /* each entry points to next */ 697 if (bdp->d_fileno == 0) { 698 inp += reclen; /* it is a hole; squish it out */ 699 continue; 700 } 701 linuxreclen = LINUX_RECLEN(&idb, bdp->d_namlen); 702 if (reclen > len || resid < linuxreclen) { 703 /* entry too big for buffer, so just stop */ 704 outp++; 705 break; 706 } 707 /* 708 * Massage in place to make a Linux-shaped dirent (otherwise 709 * we have to worry about touching user memory outside of 710 * the copyout() call). 711 */ 712 idb.d_ino = (long)bdp->d_fileno; 713 idb.d_off = (linux_off_t)linuxreclen; 714 idb.d_reclen = (u_short)bdp->d_namlen; 715 strcpy(idb.d_name, bdp->d_name); 716 if ((error = copyout((caddr_t)&idb, outp, linuxreclen))) 717 goto out; 718 /* advance past this real entry */ 719 inp += reclen; 720 /* advance output past Linux-shaped entry */ 721 outp += linuxreclen; 722 resid -= linuxreclen; 723 if (justone) 724 break; 725 } 726 727 /* if we squished out the whole block, try again */ 728 if (outp == (caddr_t) SCARG(uap, dent)) 729 goto again; 730 fp->f_offset = off; /* update the vnode offset */ 731 732 if (justone) 733 nbytes = resid + linuxreclen; 734 735 eof: 736 *retval = nbytes - resid; 737 out: 738 VOP_UNLOCK(vp); 739 free(buf, M_TEMP); 740 return error; 741 } 742 743 /* 744 * Out of register error once more.. Also, Linux copies the amount of 745 * time left into the user-supplied timeval structure. 746 */ 747 int 748 linux_select(p, uap, retval) 749 struct proc *p; 750 struct linux_select_args /* { 751 syscallarg(struct linux_select *) lsp; 752 } */ *uap; 753 register_t *retval; 754 { 755 struct linux_select ls; 756 struct select_args bsa; 757 struct timeval tv0, tv1, utv; 758 int error; 759 760 if ((error = copyin(SCARG(uap, lsp), (caddr_t)&ls, sizeof ls))) 761 return error; 762 763 SCARG(&bsa, nd) = ls.nfds; 764 SCARG(&bsa, in) = ls.readfds; 765 SCARG(&bsa, ou) = ls.writefds; 766 SCARG(&bsa, ex) = ls.exceptfds; 767 SCARG(&bsa, tv) = ls.timeout; 768 769 /* 770 * Store current time for computation of the amount of 771 * time left. 772 */ 773 if (ls.timeout) 774 microtime(&tv0); 775 776 error = select(p, &bsa, retval); 777 if (error) { 778 /* 779 * See fs/select.c in the Linux kernel. Without this, 780 * Maelstrom doesn't work. 781 */ 782 if (error == ERESTART) 783 error = EINTR; 784 return error; 785 } 786 787 if (ls.timeout) { 788 if (!*retval) { 789 utv.tv_sec = 0; 790 utv.tv_usec = 0; 791 } else { 792 /* 793 * Compute how many time was left of the timeout, 794 * by subtracting the current time and the time 795 * before we started the call, and subtracting 796 * that result from the user-supplied value. 797 */ 798 microtime(&tv1); 799 if ((error = copyin((caddr_t)ls.timeout, (caddr_t)&utv, 800 sizeof utv))) 801 return error; 802 timersub(&tv1, &tv0, &tv1); 803 timersub(&utv, &tv1, &utv); 804 } 805 if ((error = copyout((caddr_t)&utv, (caddr_t)ls.timeout, 806 sizeof utv))) 807 return error; 808 } 809 return 0; 810 } 811 812 /* 813 * Get the process group of a certain process. Look it up 814 * and return the value. 815 */ 816 int 817 linux_getpgid(p, uap, retval) 818 struct proc *p; 819 struct linux_getpgid_args /* { 820 syscallarg(int) pid; 821 } */ *uap; 822 register_t *retval; 823 { 824 struct proc *targp; 825 826 if (SCARG(uap, pid) != 0 && SCARG(uap, pid) != p->p_pid) 827 if ((targp = pfind(SCARG(uap, pid))) == 0) 828 return ESRCH; 829 else 830 targp = p; 831 832 retval[0] = targp->p_pgid; 833 return 0; 834 } 835 836 /* 837 * Set the 'personality' (emulation mode) for the current process. Only 838 * accept the Linux personality here (0). This call is needed because 839 * the Linux ELF crt0 issues it in an ugly kludge to make sure that 840 * ELF binaries run in Linux mode, not SVR4 mode. 841 */ 842 int 843 linux_personality(p, uap, retval) 844 struct proc *p; 845 struct linux_personality_args /* P 846 syscallarg(int) per; 847 } */ *uap; 848 register_t *retval; 849 { 850 if (SCARG(uap, per) != 0) 851 return EINVAL; 852 retval[0] = 0; 853 return 0; 854 } 855