linux_pipe.c revision 1.7
1/* $NetBSD: linux_pipe.c,v 1.7 1995/06/11 21:51:38 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/* 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_syscallargs.h> 75#include <compat/linux/linux_util.h> 76#include <compat/linux/linux_dirent.h> 77 78/* 79 * The information on a terminated (or stopped) process needs 80 * to be converted in order for Linux binaries to get a valid signal 81 * number out of it. 82 */ 83static int 84bsd_to_linux_wstat(status) 85 int *status; 86{ 87 if (WIFSIGNALED(*status)) 88 *status = (*status & ~0177) | 89 bsd_to_linux_sig(WTERMSIG(*status)); 90 else if (WIFSTOPPED(*status)) 91 *status = (*status & ~0xff00) | 92 (bsd_to_linux_sig(WSTOPSIG(*status)) << 8); 93} 94 95/* 96 * waitpid(2). Passed on to the NetBSD call, surrounded by code to 97 * reserve some space for a NetBSD-style wait status, and converting 98 * it to what Linux wants. 99 */ 100int 101linux_waitpid(p, uap, retval) 102 struct proc *p; 103 struct linux_waitpid_args /* { 104 syscallarg(int) pid; 105 syscallarg(int *) status; 106 syscallarg(int) options; 107 } */ *uap; 108 register_t *retval; 109{ 110 struct wait4_args w4a; 111 int error, *status, tstat; 112 caddr_t sg; 113 114 sg = stackgap_init(); 115 status = (int *) stackgap_alloc(&sg, sizeof status); 116 117 SCARG(&w4a, pid) = SCARG(uap, pid); 118 SCARG(&w4a, status) = status; 119 SCARG(&w4a, options) = SCARG(uap, options); 120 SCARG(&w4a, rusage) = NULL; 121 122 if ((error = wait4(p, &w4a, retval))) 123 return error; 124 125 if ((error = copyin(status, &tstat, sizeof tstat))) 126 return error; 127 128 bsd_to_linux_wstat(&tstat); 129 130 return copyout(&tstat, SCARG(uap, status), sizeof tstat); 131} 132 133/* 134 * This is very much the same as waitpid() 135 */ 136int 137linux_wait4(p, uap, retval) 138 struct proc *p; 139 struct linux_wait4_args /* { 140 syscallarg(int) pid; 141 syscallarg(int *) status; 142 syscallarg(int) options; 143 syscallarg(struct rusage *) rusage; 144 } */ *uap; 145 register_t *retval; 146{ 147 struct wait4_args w4a; 148 int error, *status, tstat; 149 caddr_t sg; 150 151 sg = stackgap_init(); 152 status = (int *) stackgap_alloc(&sg, sizeof status); 153 154 SCARG(&w4a, pid) = SCARG(uap, pid); 155 SCARG(&w4a, status) = status; 156 SCARG(&w4a, options) = SCARG(uap, options); 157 SCARG(&w4a, rusage) = SCARG(uap, rusage); 158 159 if ((error = wait4(p, &w4a, retval))) 160 return error; 161 162 if ((error = copyin(status, &tstat, sizeof tstat))) 163 return error; 164 165 bsd_to_linux_wstat(&tstat); 166 167 return copyout(&tstat, SCARG(uap, status), sizeof tstat); 168} 169 170/* 171 * This is the old brk(2) call. I don't think anything in the Linux 172 * world uses this anymore 173 */ 174int 175linux_break(p, uap, retval) 176 struct proc *p; 177 struct linux_brk_args /* { 178 syscallarg(char *) nsize; 179 } */ *uap; 180 register_t *retval; 181{ 182 return ENOSYS; 183} 184 185/* 186 * Linux brk(2). The check if the new address is >= the old one is 187 * done in the kernel in Linux. NetBSD does it in the library. 188 */ 189int 190linux_brk(p, uap, retval) 191 struct proc *p; 192 struct linux_brk_args /* { 193 syscallarg(char *) nsize; 194 } */ *uap; 195 register_t *retval; 196{ 197 char *nbrk = SCARG(uap, nsize); 198 struct obreak_args oba; 199 struct vmspace *vm = p->p_vmspace; 200 int error = 0; 201 caddr_t oldbrk, newbrk; 202 203 oldbrk = vm->vm_daddr + ctob(vm->vm_dsize); 204 /* 205 * XXX inconsistent.. Linux always returns at least the old 206 * brk value, but it will be page-aligned if this fails, 207 * and possibly not page aligned if it succeeds (the user 208 * supplied pointer is returned). 209 */ 210 SCARG(&oba, nsize) = nbrk; 211 212 if ((caddr_t) nbrk > vm->vm_daddr && obreak(p, &oba, retval) == 0) 213 retval[0] = (register_t) nbrk; 214 else 215 retval[0] = (register_t) oldbrk; 216 217 return 0; 218} 219 220/* 221 * I wonder why Linux has gettimeofday() _and_ time().. Still, we 222 * need to deal with it. 223 */ 224int 225linux_time(p, uap, retval) 226 struct proc *p; 227 struct linux_time_args /* { 228 linux_time_t *t; 229 } */ *uap; 230 register_t *retval; 231{ 232 struct timeval atv; 233 linux_time_t tt; 234 int error; 235 236 microtime(&atv); 237 238 tt = atv.tv_sec; 239 if (SCARG(uap, t) && (error = copyout(&tt, SCARG(uap, t), sizeof tt))) 240 return error; 241 242 retval[0] = tt; 243 return 0; 244} 245 246/* 247 * Convert BSD statfs structure to Linux statfs structure. 248 * The Linux structure has less fields, and it also wants 249 * the length of a name in a dir entry in a field, which 250 * we fake (probably the wrong way). 251 */ 252static void 253bsd_to_linux_statfs(bsp, lsp) 254 struct statfs *bsp; 255 struct linux_statfs *lsp; 256{ 257 lsp->l_ftype = bsp->f_type; 258 lsp->l_fbsize = bsp->f_bsize; 259 lsp->l_fblocks = bsp->f_blocks; 260 lsp->l_fbfree = bsp->f_bfree; 261 lsp->l_fbavail = bsp->f_bavail; 262 lsp->l_ffiles = bsp->f_files; 263 lsp->l_fffree = bsp->f_ffree; 264 lsp->l_ffsid.val[0] = bsp->f_fsid.val[0]; 265 lsp->l_ffsid.val[1] = bsp->f_fsid.val[1]; 266 lsp->l_fnamelen = MAXNAMLEN; /* XXX */ 267} 268 269/* 270 * Implement the fs stat functions. Straightforward. 271 */ 272int 273linux_statfs(p, uap, retval) 274 struct proc *p; 275 struct linux_statfs_args /* { 276 syscallarg(char *) path; 277 syscallarg(struct linux_statfs *) sp; 278 } */ *uap; 279 register_t *retval; 280{ 281 struct statfs btmp, *bsp; 282 struct linux_statfs ltmp; 283 struct statfs_args bsa; 284 caddr_t sg; 285 int error; 286 287 sg = stackgap_init(); 288 bsp = (struct statfs *) stackgap_alloc(&sg, sizeof (struct statfs)); 289 290 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 291 292 SCARG(&bsa, path) = SCARG(uap, path); 293 SCARG(&bsa, buf) = bsp; 294 295 if ((error = statfs(p, &bsa, retval))) 296 return error; 297 298 if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp))) 299 return error; 300 301 bsd_to_linux_statfs(&btmp, <mp); 302 303 return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp); 304} 305 306int 307linux_fstatfs(p, uap, retval) 308 struct proc *p; 309 struct linux_fstatfs_args /* { 310 syscallarg(int) fd; 311 syscallarg(struct linux_statfs *) sp; 312 } */ *uap; 313 register_t *retval; 314{ 315 struct statfs btmp, *bsp; 316 struct linux_statfs ltmp; 317 struct fstatfs_args bsa; 318 caddr_t sg; 319 int error; 320 321 sg = stackgap_init(); 322 bsp = (struct statfs *) stackgap_alloc(&sg, sizeof (struct statfs)); 323 324 SCARG(&bsa, fd) = SCARG(uap, fd); 325 SCARG(&bsa, buf) = bsp; 326 327 if ((error = statfs(p, &bsa, retval))) 328 return error; 329 330 if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp))) 331 return error; 332 333 bsd_to_linux_statfs(&btmp, <mp); 334 335 return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp); 336} 337 338/* 339 * uname(). Just copy the info from the various strings stored in the 340 * kernel, and put it in the Linux utsname structure. That structure 341 * is almost the same as the NetBSD one, only it has fields 65 characters 342 * long, and an extra domainname field. 343 */ 344int 345linux_uname(p, uap, retval) 346 struct proc *p; 347 struct linux_uname_args /* { 348 syscallarg(struct linux_utsname *) up; 349 } */ *uap; 350 register_t *retval; 351{ 352 extern char ostype[], osrelease[], version[], hostname[], domainname[]; 353 extern char machine[]; 354 struct linux_utsname tluts; 355 int len; 356 char *cp; 357 358 strncpy(tluts.l_sysname, ostype, sizeof (tluts.l_sysname)); 359 strncpy(tluts.l_nodename, hostname, sizeof (tluts.l_nodename)); 360 strncpy(tluts.l_release, osrelease, sizeof (tluts.l_release)); 361 strncpy(tluts.l_machine, machine, sizeof (tluts.l_machine)); 362 strncpy(tluts.l_domainname, domainname, sizeof (tluts.l_domainname)); 363 strncpy(tluts.l_version, version, sizeof (tluts.l_version)); 364 365 /* This part taken from the the uname() in libc */ 366 len = sizeof (tluts.l_version); 367 for (cp = tluts.l_version; len--; ++cp) 368 if (*cp == '\n' || *cp == '\t') 369 if (len > 1) 370 *cp = ' '; 371 else 372 *cp = '\0'; 373 374 return copyout(&tluts, SCARG(uap, up), sizeof tluts); 375} 376 377/* 378 * Linux wants to pass everything to a syscall in registers. However, 379 * mmap() has 6 of them. Oops: out of register error. They just pass 380 * everything in a structure. 381 */ 382int 383linux_mmap(p, uap, retval) 384 struct proc *p; 385 struct linux_mmap_args /* { 386 syscallarg(struct linux_mmap *) lmp; 387 } */ *uap; 388 register_t *retval; 389{ 390 struct linux_mmap lmap; 391 struct mmap_args cma; 392 int error, flags; 393 394 if ((error = copyin(SCARG(uap, lmp), &lmap, sizeof lmap))) 395 return error; 396 397 flags = 0; 398 flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_SHARED, MAP_SHARED); 399 flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_PRIVATE, MAP_PRIVATE); 400 flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_FIXED, MAP_FIXED); 401 flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_ANON, MAP_ANON); 402 403 SCARG(&cma,addr) = lmap.lm_addr; 404 SCARG(&cma,len) = lmap.lm_len; 405 SCARG(&cma,prot) = lmap.lm_prot; 406 SCARG(&cma,flags) = flags; 407 SCARG(&cma,fd) = lmap.lm_fd; 408 SCARG(&cma,pad) = 0; 409 SCARG(&cma,pos) = lmap.lm_pos; 410 411 return mmap(p, &cma, retval); 412} 413 414/* 415 * Linux doesn't use the retval[1] value to determine whether 416 * we are the child or parent. 417 */ 418int 419linux_fork(p, uap, retval) 420 struct proc *p; 421 void *uap; 422 register_t *retval; 423{ 424 int error; 425 426 if ((error = fork(p, uap, retval))) 427 return error; 428 429 if (retval[1] == 1) 430 retval[0] = 0; 431 432 return 0; 433} 434 435/* 436 * This code is partly stolen from src/lib/libc/compat-43/times.c 437 * XXX - CLK_TCK isn't declared in /sys, just in <time.h>, done here 438 */ 439 440#define CLK_TCK 100 441#define CONVTCK(r) (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK)) 442 443int 444linux_times(p, uap, retval) 445 struct proc *p; 446 struct linux_times_args /* { 447 syscallarg(struct times *) tms; 448 } */ *uap; 449 register_t *retval; 450{ 451 struct timeval t; 452 struct linux_tms ltms; 453 struct rusage ru; 454 int error, s; 455 456 calcru(p, &ru.ru_utime, &ru.ru_stime, NULL); 457 ltms.ltms_utime = CONVTCK(ru.ru_utime); 458 ltms.ltms_stime = CONVTCK(ru.ru_stime); 459 460 ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime); 461 ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime); 462 463 if ((error = copyout(<ms, SCARG(uap, tms), sizeof ltms))) 464 return error; 465 466 s = splclock(); 467 timersub(&time, &boottime, &t); 468 splx(s); 469 470 retval[0] = ((linux_clock_t)(CONVTCK(t))); 471 return 0; 472} 473 474/* 475 * NetBSD passes fd[0] in retval[0], and fd[1] in retval[1]. 476 * Linux directly passes the pointer. 477 */ 478int 479linux_pipe(p, uap, retval) 480 struct proc *p; 481 struct linux_pipe_args /* { 482 syscallarg(int *) pfds; 483 } */ *uap; 484 register_t *retval; 485{ 486 int error; 487 488 if ((error = pipe(p, 0, retval))) 489 return error; 490 491 /* Assumes register_t is an int */ 492 493 if ((error = copyout(retval, SCARG(uap, pfds), 2 * sizeof (int)))) 494 return error; 495 496 retval[0] = 0; 497 return 0; 498} 499 500/* 501 * Alarm. This is a libc call which used setitimer(2) in NetBSD. 502 * Fiddle with the timers to make it work. 503 */ 504int 505linux_alarm(p, uap, retval) 506 struct proc *p; 507 struct linux_alarm_args /* { 508 syscallarg(unsigned int) secs; 509 } */ *uap; 510 register_t *retval; 511{ 512 int error, s; 513 struct itimerval *itp, it; 514 515 itp = &p->p_realtimer; 516 s = splclock(); 517 /* 518 * Clear any pending timer alarms. 519 */ 520 untimeout(realitexpire, p); 521 timerclear(&itp->it_interval); 522 if (timerisset(&itp->it_value) && 523 timercmp(&itp->it_value, &time, >)) 524 timersub(&itp->it_value, &time, &itp->it_value); 525 /* 526 * Return how many seconds were left (rounded up) 527 */ 528 retval[0] = itp->it_value.tv_sec; 529 if (itp->it_value.tv_usec) 530 retval[0]++; 531 532 /* 533 * alarm(0) just resets the timer. 534 */ 535 if (SCARG(uap, secs) == 0) { 536 timerclear(&itp->it_value); 537 splx(s); 538 return 0; 539 } 540 541 /* 542 * Check the new alarm time for sanity, and set it. 543 */ 544 timerclear(&it.it_interval); 545 it.it_value.tv_sec = SCARG(uap, secs); 546 it.it_value.tv_usec = 0; 547 if (itimerfix(&it.it_value) || itimerfix(&it.it_interval)) { 548 splx(s); 549 return (EINVAL); 550 } 551 552 if (timerisset(&it.it_value)) { 553 timeradd(&it.it_value, &time, &it.it_value); 554 timeout(realitexpire, p, hzto(&it.it_value)); 555 } 556 p->p_realtimer = it; 557 splx(s); 558 559 return 0; 560} 561 562/* 563 * utime(). Do conversion to things that utimes() understands, 564 * and pass it on. 565 */ 566int 567linux_utime(p, uap, retval) 568 struct proc *p; 569 struct linux_utime_args /* { 570 syscallarg(char *) path; 571 syscallarg(struct linux_utimbuf *)times; 572 } */ *uap; 573 register_t *retval; 574{ 575 caddr_t sg; 576 int error; 577 struct utimes_args ua; 578 struct timeval tv[2], *tvp; 579 struct linux_utimbuf lut; 580 581 sg = stackgap_init(); 582 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 583 584 SCARG(&ua, path) = SCARG(uap, path); 585 586 if (SCARG(uap, times) != NULL) { 587 if ((error = copyin(SCARG(uap, times), &lut, sizeof lut))) 588 return error; 589 tv[0].tv_usec = tv[1].tv_usec = 0; 590 tv[0].tv_sec = lut.l_actime; 591 tv[1].tv_sec = lut.l_modtime; 592 tvp = (struct timeval *) stackgap_alloc(sizeof tv); 593 if ((error = copyout(tv, tvp, sizeof tv))) 594 return error; 595 SCARG(&ua, tptr) = tvp; 596 } 597 else 598 SCARG(&ua, tptr) = NULL; 599 600 return utimes(p, uap, retval); 601} 602 603/* 604 * Linux 'readdir' call. This code is mostly taken from the 605 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 606 * an attempt has been made to keep it a little cleaner (failing 607 * miserably, because of the cruft needed if count 1 is passed). 608 * 609 * Read in BSD-style entries, convert them, and copy them out. 610 * Note that the Linux d_reclen is actually the name length, 611 * and d_off is the reclen. 612 * 613 * Note that this doesn't handle union-mounted filesystems. 614 */ 615int 616linux_readdir(p, uap, retval) 617 struct proc *p; 618 struct linux_readdir_args /* { 619 syscallarg(int) fd; 620 syscallarg(struct linux_dirent *) dent; 621 syscallarg(unsigned int) count; 622 } */ *uap; 623 register_t *retval; 624{ 625 register struct dirent *bdp; 626 struct vnode *vp; 627 caddr_t inp, buf; /* BSD-format */ 628 int len, reclen; /* BSD-format */ 629 caddr_t outp; /* Linux-format */ 630 int resid, linuxreclen; /* Linux-format */ 631 struct file *fp; 632 struct uio auio; 633 struct iovec aiov; 634 struct linux_dirent idb; 635 off_t off; /* true file offset */ 636 linux_off_t soff; /* Linux file offset */ 637 int buflen, error, eofflag, nbytes, justone; 638 struct vattr va; 639 640 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 641 return (error); 642 643 if ((fp->f_flag & FREAD) == 0) 644 return (EBADF); 645 646 vp = (struct vnode *)fp->f_data; 647 648 if (vp->v_type != VDIR) /* XXX vnode readdir op should do this */ 649 return (EINVAL); 650 651 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p))) 652 return error; 653 654 nbytes = SCARG(uap, count); 655 if (nbytes == 1) { /* Need this for older Linux libs, apparently */ 656 nbytes = sizeof (struct linux_dirent); 657 buflen = max(va.va_blocksize, nbytes); 658 justone = 1; 659 } else { 660 buflen = min(MAXBSIZE, nbytes); 661 justone = 0; 662 } 663 buf = malloc(buflen, M_TEMP, M_WAITOK); 664 VOP_LOCK(vp); 665 off = fp->f_offset; 666again: 667 aiov.iov_base = buf; 668 aiov.iov_len = buflen; 669 auio.uio_iov = &aiov; 670 auio.uio_iovcnt = 1; 671 auio.uio_rw = UIO_READ; 672 auio.uio_segflg = UIO_SYSSPACE; 673 auio.uio_procp = p; 674 auio.uio_resid = buflen; 675 auio.uio_offset = off; 676 /* 677 * First we read into the malloc'ed buffer, then 678 * we massage it into user space, one record at a time. 679 */ 680 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, (u_long *)0, 0); 681 if (error) 682 goto out; 683 684 inp = buf; 685 outp = (caddr_t) SCARG(uap, dent); 686 resid = nbytes; 687 if ((len = buflen - auio.uio_resid) == 0) 688 goto eof; 689 690 for (; len > 0; len -= reclen) { 691 bdp = (struct dirent *)inp; 692 reclen = bdp->d_reclen; 693 if (reclen & 3) 694 panic("linux_readdir"); 695 off += reclen; /* each entry points to next */ 696 if (bdp->d_fileno == 0) { 697 inp += reclen; /* it is a hole; squish it out */ 698 continue; 699 } 700 linuxreclen = LINUX_RECLEN(&idb, bdp->d_namlen); 701 if (reclen > len || resid < linuxreclen) { 702 /* entry too big for buffer, so just stop */ 703 outp++; 704 break; 705 } 706 /* 707 * Massage in place to make a Linux-shaped dirent (otherwise 708 * we have to worry about touching user memory outside of 709 * the copyout() call). 710 */ 711 idb.d_ino = (long)bdp->d_fileno; 712 idb.d_off = (linux_off_t)linuxreclen; 713 idb.d_reclen = (u_short)bdp->d_namlen; 714 strcpy(idb.d_name, bdp->d_name); 715 if ((error = copyout((caddr_t)&idb, outp, linuxreclen))) 716 goto out; 717 /* advance past this real entry */ 718 inp += reclen; 719 /* advance output past Linux-shaped entry */ 720 outp += linuxreclen; 721 resid -= linuxreclen; 722 if (justone) 723 break; 724 } 725 726 /* if we squished out the whole block, try again */ 727 if (outp == (caddr_t) SCARG(uap, dent)) 728 goto again; 729 fp->f_offset = off; /* update the vnode offset */ 730 731 if (justone) 732 nbytes = resid + linuxreclen; 733 734eof: 735 *retval = nbytes - resid; 736out: 737 VOP_UNLOCK(vp); 738 free(buf, M_TEMP); 739 return error; 740} 741 742/* 743 * Out of register error once more.. Also, Linux copies the amount of 744 * time left into the user-supplied timeval structure. 745 */ 746int 747linux_select(p, uap, retval) 748 struct proc *p; 749 struct linux_select_args /* { 750 syscallarg(struct linux_select *) lsp; 751 } */ *uap; 752 register_t *retval; 753{ 754 struct linux_select ls; 755 struct select_args bsa; 756 struct timeval tv0, tv1, utv; 757 int error; 758 759 if ((error = copyin(SCARG(uap, lsp), (caddr_t)&ls, sizeof ls))) 760 return error; 761 762 SCARG(&bsa, nd) = ls.nfds; 763 SCARG(&bsa, in) = ls.readfds; 764 SCARG(&bsa, ou) = ls.writefds; 765 SCARG(&bsa, ex) = ls.exceptfds; 766 SCARG(&bsa, tv) = ls.timeout; 767 768 /* 769 * Store current time for computation of the amount of 770 * time left. 771 */ 772 if (ls.timeout) 773 microtime(&tv0); 774 775 if ((error = select(p, &bsa, retval))) 776 return error; 777 778 if (ls.timeout) { 779 if (!*retval) { 780 utv.tv_sec = 0; 781 utv.tv_usec = 0; 782 } else { 783 /* 784 * Compute how many time was left of the timeout, 785 * by subtracting the current time and the time 786 * before we started the call, and subtracting 787 * that result from the user-supplied value. 788 */ 789 microtime(&tv1); 790 if ((error = copyin((caddr_t)ls.timeout, (caddr_t)&utv, 791 sizeof utv))) 792 return error; 793 timersub(&tv1, &tv0, &tv1); 794 timersub(&utv, &tv1, &utv); 795 } 796 if ((error = copyout((caddr_t)&utv, (caddr_t)ls.timeout, 797 sizeof utv))) 798 return error; 799 } 800 return 0; 801} 802 803/* 804 * Get the process group of a certain process. Look it up 805 * and return the value. 806 */ 807int 808linux_getpgid(p, uap, retval) 809 struct proc *p; 810 struct linux_getpgid_args /* { 811 syscallarg(int) pid; 812 } */ *uap; 813 register_t *retval; 814{ 815 struct proc *targp; 816 817 if (SCARG(uap, pid) != 0 && SCARG(uap, pid) != p->p_pid) 818 if ((targp = pfind(SCARG(uap, pid))) == 0) 819 return ESRCH; 820 else 821 targp = p; 822 823 retval[0] = targp->p_pgid; 824 return 0; 825} 826 827/* 828 * Set the 'personality' (emulation mode) for the current process. Only 829 * accept the Linux personality here (0). This call is needed because 830 * the Linux ELF crt0 issues it in an ugly kludge to make sure that 831 * ELF binaries run in Linux mode, not SVR4 mode. 832 */ 833int 834linux_personality(p, uap, retval) 835 struct proc *p; 836 struct linux_personality_args /* P 837 syscallarg(int) per; 838 } */ *uap; 839 register_t *retval; 840{ 841 if (SCARG(uap, per) != 0) 842 return EINVAL; 843 retval[0] = 0; 844 return 0; 845} 846