The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_misc.c

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    1 /*-
    2  * Copyright (c) 2002 Doug Rabson
    3  * Copyright (c) 1994-1995 Søren Schmidt
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer
   11  *    in this position and unchanged.
   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. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/9.0/sys/compat/linux/linux_misc.c 225617 2011-09-16 13:58:51Z kmacy $");
   32 
   33 #include "opt_compat.h"
   34 
   35 #include <sys/param.h>
   36 #include <sys/blist.h>
   37 #include <sys/fcntl.h>
   38 #if defined(__i386__)
   39 #include <sys/imgact_aout.h>
   40 #endif
   41 #include <sys/jail.h>
   42 #include <sys/kernel.h>
   43 #include <sys/limits.h>
   44 #include <sys/lock.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mman.h>
   47 #include <sys/mount.h>
   48 #include <sys/mutex.h>
   49 #include <sys/namei.h>
   50 #include <sys/priv.h>
   51 #include <sys/proc.h>
   52 #include <sys/reboot.h>
   53 #include <sys/racct.h>
   54 #include <sys/resourcevar.h>
   55 #include <sys/sched.h>
   56 #include <sys/signalvar.h>
   57 #include <sys/stat.h>
   58 #include <sys/syscallsubr.h>
   59 #include <sys/sysctl.h>
   60 #include <sys/sysproto.h>
   61 #include <sys/systm.h>
   62 #include <sys/time.h>
   63 #include <sys/vmmeter.h>
   64 #include <sys/vnode.h>
   65 #include <sys/wait.h>
   66 #include <sys/cpuset.h>
   67 
   68 #include <security/mac/mac_framework.h>
   69 
   70 #include <vm/vm.h>
   71 #include <vm/pmap.h>
   72 #include <vm/vm_kern.h>
   73 #include <vm/vm_map.h>
   74 #include <vm/vm_extern.h>
   75 #include <vm/vm_object.h>
   76 #include <vm/swap_pager.h>
   77 
   78 #ifdef COMPAT_LINUX32
   79 #include <machine/../linux32/linux.h>
   80 #include <machine/../linux32/linux32_proto.h>
   81 #else
   82 #include <machine/../linux/linux.h>
   83 #include <machine/../linux/linux_proto.h>
   84 #endif
   85 
   86 #include <compat/linux/linux_file.h>
   87 #include <compat/linux/linux_mib.h>
   88 #include <compat/linux/linux_signal.h>
   89 #include <compat/linux/linux_util.h>
   90 #include <compat/linux/linux_sysproto.h>
   91 #include <compat/linux/linux_emul.h>
   92 #include <compat/linux/linux_misc.h>
   93 
   94 int stclohz;                            /* Statistics clock frequency */
   95 
   96 static unsigned int linux_to_bsd_resource[LINUX_RLIM_NLIMITS] = {
   97         RLIMIT_CPU, RLIMIT_FSIZE, RLIMIT_DATA, RLIMIT_STACK,
   98         RLIMIT_CORE, RLIMIT_RSS, RLIMIT_NPROC, RLIMIT_NOFILE,
   99         RLIMIT_MEMLOCK, RLIMIT_AS 
  100 };
  101 
  102 struct l_sysinfo {
  103         l_long          uptime;         /* Seconds since boot */
  104         l_ulong         loads[3];       /* 1, 5, and 15 minute load averages */
  105 #define LINUX_SYSINFO_LOADS_SCALE 65536
  106         l_ulong         totalram;       /* Total usable main memory size */
  107         l_ulong         freeram;        /* Available memory size */
  108         l_ulong         sharedram;      /* Amount of shared memory */
  109         l_ulong         bufferram;      /* Memory used by buffers */
  110         l_ulong         totalswap;      /* Total swap space size */
  111         l_ulong         freeswap;       /* swap space still available */
  112         l_ushort        procs;          /* Number of current processes */
  113         l_ushort        pads;
  114         l_ulong         totalbig;
  115         l_ulong         freebig;
  116         l_uint          mem_unit;
  117         char            _f[20-2*sizeof(l_long)-sizeof(l_int)];  /* padding */
  118 };
  119 int
  120 linux_sysinfo(struct thread *td, struct linux_sysinfo_args *args)
  121 {
  122         struct l_sysinfo sysinfo;
  123         vm_object_t object;
  124         int i, j;
  125         struct timespec ts;
  126 
  127         getnanouptime(&ts);
  128         if (ts.tv_nsec != 0)
  129                 ts.tv_sec++;
  130         sysinfo.uptime = ts.tv_sec;
  131 
  132         /* Use the information from the mib to get our load averages */
  133         for (i = 0; i < 3; i++)
  134                 sysinfo.loads[i] = averunnable.ldavg[i] *
  135                     LINUX_SYSINFO_LOADS_SCALE / averunnable.fscale;
  136 
  137         sysinfo.totalram = physmem * PAGE_SIZE;
  138         sysinfo.freeram = sysinfo.totalram - cnt.v_wire_count * PAGE_SIZE;
  139 
  140         sysinfo.sharedram = 0;
  141         mtx_lock(&vm_object_list_mtx);
  142         TAILQ_FOREACH(object, &vm_object_list, object_list)
  143                 if (object->shadow_count > 1)
  144                         sysinfo.sharedram += object->resident_page_count;
  145         mtx_unlock(&vm_object_list_mtx);
  146 
  147         sysinfo.sharedram *= PAGE_SIZE;
  148         sysinfo.bufferram = 0;
  149 
  150         swap_pager_status(&i, &j);
  151         sysinfo.totalswap = i * PAGE_SIZE;
  152         sysinfo.freeswap = (i - j) * PAGE_SIZE;
  153 
  154         sysinfo.procs = nprocs;
  155 
  156         /* The following are only present in newer Linux kernels. */
  157         sysinfo.totalbig = 0;
  158         sysinfo.freebig = 0;
  159         sysinfo.mem_unit = 1;
  160 
  161         return (copyout(&sysinfo, args->info, sizeof(sysinfo)));
  162 }
  163 
  164 int
  165 linux_alarm(struct thread *td, struct linux_alarm_args *args)
  166 {
  167         struct itimerval it, old_it;
  168         u_int secs;
  169         int error;
  170 
  171 #ifdef DEBUG
  172         if (ldebug(alarm))
  173                 printf(ARGS(alarm, "%u"), args->secs);
  174 #endif
  175         
  176         secs = args->secs;
  177 
  178         if (secs > INT_MAX)
  179                 secs = INT_MAX;
  180 
  181         it.it_value.tv_sec = (long) secs;
  182         it.it_value.tv_usec = 0;
  183         it.it_interval.tv_sec = 0;
  184         it.it_interval.tv_usec = 0;
  185         error = kern_setitimer(td, ITIMER_REAL, &it, &old_it);
  186         if (error)
  187                 return (error);
  188         if (timevalisset(&old_it.it_value)) {
  189                 if (old_it.it_value.tv_usec != 0)
  190                         old_it.it_value.tv_sec++;
  191                 td->td_retval[0] = old_it.it_value.tv_sec;
  192         }
  193         return (0);
  194 }
  195 
  196 int
  197 linux_brk(struct thread *td, struct linux_brk_args *args)
  198 {
  199         struct vmspace *vm = td->td_proc->p_vmspace;
  200         vm_offset_t new, old;
  201         struct obreak_args /* {
  202                 char * nsize;
  203         } */ tmp;
  204 
  205 #ifdef DEBUG
  206         if (ldebug(brk))
  207                 printf(ARGS(brk, "%p"), (void *)(uintptr_t)args->dsend);
  208 #endif
  209         old = (vm_offset_t)vm->vm_daddr + ctob(vm->vm_dsize);
  210         new = (vm_offset_t)args->dsend;
  211         tmp.nsize = (char *)new;
  212         if (((caddr_t)new > vm->vm_daddr) && !sys_obreak(td, &tmp))
  213                 td->td_retval[0] = (long)new;
  214         else
  215                 td->td_retval[0] = (long)old;
  216 
  217         return (0);
  218 }
  219 
  220 #if defined(__i386__)
  221 /* XXX: what about amd64/linux32? */
  222 
  223 int
  224 linux_uselib(struct thread *td, struct linux_uselib_args *args)
  225 {
  226         struct nameidata ni;
  227         struct vnode *vp;
  228         struct exec *a_out;
  229         struct vattr attr;
  230         vm_offset_t vmaddr;
  231         unsigned long file_offset;
  232         vm_offset_t buffer;
  233         unsigned long bss_size;
  234         char *library;
  235         int error;
  236         int locked, vfslocked;
  237 
  238         LCONVPATHEXIST(td, args->library, &library);
  239 
  240 #ifdef DEBUG
  241         if (ldebug(uselib))
  242                 printf(ARGS(uselib, "%s"), library);
  243 #endif
  244 
  245         a_out = NULL;
  246         vfslocked = 0;
  247         locked = 0;
  248         vp = NULL;
  249 
  250         NDINIT(&ni, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
  251             UIO_SYSSPACE, library, td);
  252         error = namei(&ni);
  253         LFREEPATH(library);
  254         if (error)
  255                 goto cleanup;
  256 
  257         vp = ni.ni_vp;
  258         vfslocked = NDHASGIANT(&ni);
  259         NDFREE(&ni, NDF_ONLY_PNBUF);
  260 
  261         /*
  262          * From here on down, we have a locked vnode that must be unlocked.
  263          * XXX: The code below largely duplicates exec_check_permissions().
  264          */
  265         locked = 1;
  266 
  267         /* Writable? */
  268         if (vp->v_writecount) {
  269                 error = ETXTBSY;
  270                 goto cleanup;
  271         }
  272 
  273         /* Executable? */
  274         error = VOP_GETATTR(vp, &attr, td->td_ucred);
  275         if (error)
  276                 goto cleanup;
  277 
  278         if ((vp->v_mount->mnt_flag & MNT_NOEXEC) ||
  279             ((attr.va_mode & 0111) == 0) || (attr.va_type != VREG)) {
  280                 /* EACCESS is what exec(2) returns. */
  281                 error = ENOEXEC;
  282                 goto cleanup;
  283         }
  284 
  285         /* Sensible size? */
  286         if (attr.va_size == 0) {
  287                 error = ENOEXEC;
  288                 goto cleanup;
  289         }
  290 
  291         /* Can we access it? */
  292         error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td);
  293         if (error)
  294                 goto cleanup;
  295 
  296         /*
  297          * XXX: This should use vn_open() so that it is properly authorized,
  298          * and to reduce code redundancy all over the place here.
  299          * XXX: Not really, it duplicates far more of exec_check_permissions()
  300          * than vn_open().
  301          */
  302 #ifdef MAC
  303         error = mac_vnode_check_open(td->td_ucred, vp, VREAD);
  304         if (error)
  305                 goto cleanup;
  306 #endif
  307         error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL);
  308         if (error)
  309                 goto cleanup;
  310 
  311         /* Pull in executable header into kernel_map */
  312         error = vm_mmap(kernel_map, (vm_offset_t *)&a_out, PAGE_SIZE,
  313             VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE, vp, 0);
  314         if (error)
  315                 goto cleanup;
  316 
  317         /* Is it a Linux binary ? */
  318         if (((a_out->a_magic >> 16) & 0xff) != 0x64) {
  319                 error = ENOEXEC;
  320                 goto cleanup;
  321         }
  322 
  323         /*
  324          * While we are here, we should REALLY do some more checks
  325          */
  326 
  327         /* Set file/virtual offset based on a.out variant. */
  328         switch ((int)(a_out->a_magic & 0xffff)) {
  329         case 0413:                      /* ZMAGIC */
  330                 file_offset = 1024;
  331                 break;
  332         case 0314:                      /* QMAGIC */
  333                 file_offset = 0;
  334                 break;
  335         default:
  336                 error = ENOEXEC;
  337                 goto cleanup;
  338         }
  339 
  340         bss_size = round_page(a_out->a_bss);
  341 
  342         /* Check various fields in header for validity/bounds. */
  343         if (a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) {
  344                 error = ENOEXEC;
  345                 goto cleanup;
  346         }
  347 
  348         /* text + data can't exceed file size */
  349         if (a_out->a_data + a_out->a_text > attr.va_size) {
  350                 error = EFAULT;
  351                 goto cleanup;
  352         }
  353 
  354         /*
  355          * text/data/bss must not exceed limits
  356          * XXX - this is not complete. it should check current usage PLUS
  357          * the resources needed by this library.
  358          */
  359         PROC_LOCK(td->td_proc);
  360         if (a_out->a_text > maxtsiz ||
  361             a_out->a_data + bss_size > lim_cur(td->td_proc, RLIMIT_DATA) ||
  362             racct_set(td->td_proc, RACCT_DATA, a_out->a_data +
  363             bss_size) != 0) {
  364                 PROC_UNLOCK(td->td_proc);
  365                 error = ENOMEM;
  366                 goto cleanup;
  367         }
  368         PROC_UNLOCK(td->td_proc);
  369 
  370         /*
  371          * Prevent more writers.
  372          * XXX: Note that if any of the VM operations fail below we don't
  373          * clear this flag.
  374          */
  375         vp->v_vflag |= VV_TEXT;
  376 
  377         /*
  378          * Lock no longer needed
  379          */
  380         locked = 0;
  381         VOP_UNLOCK(vp, 0);
  382         VFS_UNLOCK_GIANT(vfslocked);
  383 
  384         /*
  385          * Check if file_offset page aligned. Currently we cannot handle
  386          * misalinged file offsets, and so we read in the entire image
  387          * (what a waste).
  388          */
  389         if (file_offset & PAGE_MASK) {
  390 #ifdef DEBUG
  391                 printf("uselib: Non page aligned binary %lu\n", file_offset);
  392 #endif
  393                 /* Map text+data read/write/execute */
  394 
  395                 /* a_entry is the load address and is page aligned */
  396                 vmaddr = trunc_page(a_out->a_entry);
  397 
  398                 /* get anon user mapping, read+write+execute */
  399                 error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0,
  400                     &vmaddr, a_out->a_text + a_out->a_data, FALSE, VM_PROT_ALL,
  401                     VM_PROT_ALL, 0);
  402                 if (error)
  403                         goto cleanup;
  404 
  405                 /* map file into kernel_map */
  406                 error = vm_mmap(kernel_map, &buffer,
  407                     round_page(a_out->a_text + a_out->a_data + file_offset),
  408                     VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE, vp,
  409                     trunc_page(file_offset));
  410                 if (error)
  411                         goto cleanup;
  412 
  413                 /* copy from kernel VM space to user space */
  414                 error = copyout(PTRIN(buffer + file_offset),
  415                     (void *)vmaddr, a_out->a_text + a_out->a_data);
  416 
  417                 /* release temporary kernel space */
  418                 vm_map_remove(kernel_map, buffer, buffer +
  419                     round_page(a_out->a_text + a_out->a_data + file_offset));
  420 
  421                 if (error)
  422                         goto cleanup;
  423         } else {
  424 #ifdef DEBUG
  425                 printf("uselib: Page aligned binary %lu\n", file_offset);
  426 #endif
  427                 /*
  428                  * for QMAGIC, a_entry is 20 bytes beyond the load address
  429                  * to skip the executable header
  430                  */
  431                 vmaddr = trunc_page(a_out->a_entry);
  432 
  433                 /*
  434                  * Map it all into the process's space as a single
  435                  * copy-on-write "data" segment.
  436                  */
  437                 error = vm_mmap(&td->td_proc->p_vmspace->vm_map, &vmaddr,
  438                     a_out->a_text + a_out->a_data, VM_PROT_ALL, VM_PROT_ALL,
  439                     MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, vp, file_offset);
  440                 if (error)
  441                         goto cleanup;
  442         }
  443 #ifdef DEBUG
  444         printf("mem=%08lx = %08lx %08lx\n", (long)vmaddr, ((long *)vmaddr)[0],
  445             ((long *)vmaddr)[1]);
  446 #endif
  447         if (bss_size != 0) {
  448                 /* Calculate BSS start address */
  449                 vmaddr = trunc_page(a_out->a_entry) + a_out->a_text +
  450                     a_out->a_data;
  451 
  452                 /* allocate some 'anon' space */
  453                 error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0,
  454                     &vmaddr, bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
  455                 if (error)
  456                         goto cleanup;
  457         }
  458 
  459 cleanup:
  460         /* Unlock vnode if needed */
  461         if (locked) {
  462                 VOP_UNLOCK(vp, 0);
  463                 VFS_UNLOCK_GIANT(vfslocked);
  464         }
  465 
  466         /* Release the kernel mapping. */
  467         if (a_out)
  468                 vm_map_remove(kernel_map, (vm_offset_t)a_out,
  469                     (vm_offset_t)a_out + PAGE_SIZE);
  470 
  471         return (error);
  472 }
  473 
  474 #endif  /* __i386__ */
  475 
  476 int
  477 linux_select(struct thread *td, struct linux_select_args *args)
  478 {
  479         l_timeval ltv;
  480         struct timeval tv0, tv1, utv, *tvp;
  481         int error;
  482 
  483 #ifdef DEBUG
  484         if (ldebug(select))
  485                 printf(ARGS(select, "%d, %p, %p, %p, %p"), args->nfds,
  486                     (void *)args->readfds, (void *)args->writefds,
  487                     (void *)args->exceptfds, (void *)args->timeout);
  488 #endif
  489 
  490         /*
  491          * Store current time for computation of the amount of
  492          * time left.
  493          */
  494         if (args->timeout) {
  495                 if ((error = copyin(args->timeout, &ltv, sizeof(ltv))))
  496                         goto select_out;
  497                 utv.tv_sec = ltv.tv_sec;
  498                 utv.tv_usec = ltv.tv_usec;
  499 #ifdef DEBUG
  500                 if (ldebug(select))
  501                         printf(LMSG("incoming timeout (%jd/%ld)"),
  502                             (intmax_t)utv.tv_sec, utv.tv_usec);
  503 #endif
  504 
  505                 if (itimerfix(&utv)) {
  506                         /*
  507                          * The timeval was invalid.  Convert it to something
  508                          * valid that will act as it does under Linux.
  509                          */
  510                         utv.tv_sec += utv.tv_usec / 1000000;
  511                         utv.tv_usec %= 1000000;
  512                         if (utv.tv_usec < 0) {
  513                                 utv.tv_sec -= 1;
  514                                 utv.tv_usec += 1000000;
  515                         }
  516                         if (utv.tv_sec < 0)
  517                                 timevalclear(&utv);
  518                 }
  519                 microtime(&tv0);
  520                 tvp = &utv;
  521         } else
  522                 tvp = NULL;
  523 
  524         error = kern_select(td, args->nfds, args->readfds, args->writefds,
  525             args->exceptfds, tvp, sizeof(l_int) * 8);
  526 
  527 #ifdef DEBUG
  528         if (ldebug(select))
  529                 printf(LMSG("real select returns %d"), error);
  530 #endif
  531         if (error)
  532                 goto select_out;
  533 
  534         if (args->timeout) {
  535                 if (td->td_retval[0]) {
  536                         /*
  537                          * Compute how much time was left of the timeout,
  538                          * by subtracting the current time and the time
  539                          * before we started the call, and subtracting
  540                          * that result from the user-supplied value.
  541                          */
  542                         microtime(&tv1);
  543                         timevalsub(&tv1, &tv0);
  544                         timevalsub(&utv, &tv1);
  545                         if (utv.tv_sec < 0)
  546                                 timevalclear(&utv);
  547                 } else
  548                         timevalclear(&utv);
  549 #ifdef DEBUG
  550                 if (ldebug(select))
  551                         printf(LMSG("outgoing timeout (%jd/%ld)"),
  552                             (intmax_t)utv.tv_sec, utv.tv_usec);
  553 #endif
  554                 ltv.tv_sec = utv.tv_sec;
  555                 ltv.tv_usec = utv.tv_usec;
  556                 if ((error = copyout(&ltv, args->timeout, sizeof(ltv))))
  557                         goto select_out;
  558         }
  559 
  560 select_out:
  561 #ifdef DEBUG
  562         if (ldebug(select))
  563                 printf(LMSG("select_out -> %d"), error);
  564 #endif
  565         return (error);
  566 }
  567 
  568 int
  569 linux_mremap(struct thread *td, struct linux_mremap_args *args)
  570 {
  571         struct munmap_args /* {
  572                 void *addr;
  573                 size_t len;
  574         } */ bsd_args;
  575         int error = 0;
  576 
  577 #ifdef DEBUG
  578         if (ldebug(mremap))
  579                 printf(ARGS(mremap, "%p, %08lx, %08lx, %08lx"),
  580                     (void *)(uintptr_t)args->addr,
  581                     (unsigned long)args->old_len,
  582                     (unsigned long)args->new_len,
  583                     (unsigned long)args->flags);
  584 #endif
  585 
  586         if (args->flags & ~(LINUX_MREMAP_FIXED | LINUX_MREMAP_MAYMOVE)) {
  587                 td->td_retval[0] = 0;
  588                 return (EINVAL);
  589         }
  590 
  591         /*
  592          * Check for the page alignment.
  593          * Linux defines PAGE_MASK to be FreeBSD ~PAGE_MASK.
  594          */
  595         if (args->addr & PAGE_MASK) {
  596                 td->td_retval[0] = 0;
  597                 return (EINVAL);
  598         }
  599 
  600         args->new_len = round_page(args->new_len);
  601         args->old_len = round_page(args->old_len);
  602 
  603         if (args->new_len > args->old_len) {
  604                 td->td_retval[0] = 0;
  605                 return (ENOMEM);
  606         }
  607 
  608         if (args->new_len < args->old_len) {
  609                 bsd_args.addr =
  610                     (caddr_t)((uintptr_t)args->addr + args->new_len);
  611                 bsd_args.len = args->old_len - args->new_len;
  612                 error = sys_munmap(td, &bsd_args);
  613         }
  614 
  615         td->td_retval[0] = error ? 0 : (uintptr_t)args->addr;
  616         return (error);
  617 }
  618 
  619 #define LINUX_MS_ASYNC       0x0001
  620 #define LINUX_MS_INVALIDATE  0x0002
  621 #define LINUX_MS_SYNC        0x0004
  622 
  623 int
  624 linux_msync(struct thread *td, struct linux_msync_args *args)
  625 {
  626         struct msync_args bsd_args;
  627 
  628         bsd_args.addr = (caddr_t)(uintptr_t)args->addr;
  629         bsd_args.len = (uintptr_t)args->len;
  630         bsd_args.flags = args->fl & ~LINUX_MS_SYNC;
  631 
  632         return (sys_msync(td, &bsd_args));
  633 }
  634 
  635 int
  636 linux_time(struct thread *td, struct linux_time_args *args)
  637 {
  638         struct timeval tv;
  639         l_time_t tm;
  640         int error;
  641 
  642 #ifdef DEBUG
  643         if (ldebug(time))
  644                 printf(ARGS(time, "*"));
  645 #endif
  646 
  647         microtime(&tv);
  648         tm = tv.tv_sec;
  649         if (args->tm && (error = copyout(&tm, args->tm, sizeof(tm))))
  650                 return (error);
  651         td->td_retval[0] = tm;
  652         return (0);
  653 }
  654 
  655 struct l_times_argv {
  656         l_clock_t       tms_utime;
  657         l_clock_t       tms_stime;
  658         l_clock_t       tms_cutime;
  659         l_clock_t       tms_cstime;
  660 };
  661 
  662 
  663 /*
  664  * Glibc versions prior to 2.2.1 always use hard-coded CLK_TCK value.
  665  * Since 2.2.1 Glibc uses value exported from kernel via AT_CLKTCK
  666  * auxiliary vector entry.
  667  */
  668 #define CLK_TCK         100
  669 
  670 #define CONVOTCK(r)     (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
  671 #define CONVNTCK(r)     (r.tv_sec * stclohz + r.tv_usec / (1000000 / stclohz))
  672 
  673 #define CONVTCK(r)      (linux_kernver(td) >= LINUX_KERNVER_2004000 ?           \
  674                             CONVNTCK(r) : CONVOTCK(r))
  675 
  676 int
  677 linux_times(struct thread *td, struct linux_times_args *args)
  678 {
  679         struct timeval tv, utime, stime, cutime, cstime;
  680         struct l_times_argv tms;
  681         struct proc *p;
  682         int error;
  683 
  684 #ifdef DEBUG
  685         if (ldebug(times))
  686                 printf(ARGS(times, "*"));
  687 #endif
  688 
  689         if (args->buf != NULL) {
  690                 p = td->td_proc;
  691                 PROC_LOCK(p);
  692                 PROC_SLOCK(p);
  693                 calcru(p, &utime, &stime);
  694                 PROC_SUNLOCK(p);
  695                 calccru(p, &cutime, &cstime);
  696                 PROC_UNLOCK(p);
  697 
  698                 tms.tms_utime = CONVTCK(utime);
  699                 tms.tms_stime = CONVTCK(stime);
  700 
  701                 tms.tms_cutime = CONVTCK(cutime);
  702                 tms.tms_cstime = CONVTCK(cstime);
  703 
  704                 if ((error = copyout(&tms, args->buf, sizeof(tms))))
  705                         return (error);
  706         }
  707 
  708         microuptime(&tv);
  709         td->td_retval[0] = (int)CONVTCK(tv);
  710         return (0);
  711 }
  712 
  713 int
  714 linux_newuname(struct thread *td, struct linux_newuname_args *args)
  715 {
  716         struct l_new_utsname utsname;
  717         char osname[LINUX_MAX_UTSNAME];
  718         char osrelease[LINUX_MAX_UTSNAME];
  719         char *p;
  720 
  721 #ifdef DEBUG
  722         if (ldebug(newuname))
  723                 printf(ARGS(newuname, "*"));
  724 #endif
  725 
  726         linux_get_osname(td, osname);
  727         linux_get_osrelease(td, osrelease);
  728 
  729         bzero(&utsname, sizeof(utsname));
  730         strlcpy(utsname.sysname, osname, LINUX_MAX_UTSNAME);
  731         getcredhostname(td->td_ucred, utsname.nodename, LINUX_MAX_UTSNAME);
  732         getcreddomainname(td->td_ucred, utsname.domainname, LINUX_MAX_UTSNAME);
  733         strlcpy(utsname.release, osrelease, LINUX_MAX_UTSNAME);
  734         strlcpy(utsname.version, version, LINUX_MAX_UTSNAME);
  735         for (p = utsname.version; *p != '\0'; ++p)
  736                 if (*p == '\n') {
  737                         *p = '\0';
  738                         break;
  739                 }
  740         strlcpy(utsname.machine, linux_platform, LINUX_MAX_UTSNAME);
  741 
  742         return (copyout(&utsname, args->buf, sizeof(utsname)));
  743 }
  744 
  745 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  746 struct l_utimbuf {
  747         l_time_t l_actime;
  748         l_time_t l_modtime;
  749 };
  750 
  751 int
  752 linux_utime(struct thread *td, struct linux_utime_args *args)
  753 {
  754         struct timeval tv[2], *tvp;
  755         struct l_utimbuf lut;
  756         char *fname;
  757         int error;
  758 
  759         LCONVPATHEXIST(td, args->fname, &fname);
  760 
  761 #ifdef DEBUG
  762         if (ldebug(utime))
  763                 printf(ARGS(utime, "%s, *"), fname);
  764 #endif
  765 
  766         if (args->times) {
  767                 if ((error = copyin(args->times, &lut, sizeof lut))) {
  768                         LFREEPATH(fname);
  769                         return (error);
  770                 }
  771                 tv[0].tv_sec = lut.l_actime;
  772                 tv[0].tv_usec = 0;
  773                 tv[1].tv_sec = lut.l_modtime;
  774                 tv[1].tv_usec = 0;
  775                 tvp = tv;
  776         } else
  777                 tvp = NULL;
  778 
  779         error = kern_utimes(td, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  780         LFREEPATH(fname);
  781         return (error);
  782 }
  783 
  784 int
  785 linux_utimes(struct thread *td, struct linux_utimes_args *args)
  786 {
  787         l_timeval ltv[2];
  788         struct timeval tv[2], *tvp = NULL;
  789         char *fname;
  790         int error;
  791 
  792         LCONVPATHEXIST(td, args->fname, &fname);
  793 
  794 #ifdef DEBUG
  795         if (ldebug(utimes))
  796                 printf(ARGS(utimes, "%s, *"), fname);
  797 #endif
  798 
  799         if (args->tptr != NULL) {
  800                 if ((error = copyin(args->tptr, ltv, sizeof ltv))) {
  801                         LFREEPATH(fname);
  802                         return (error);
  803                 }
  804                 tv[0].tv_sec = ltv[0].tv_sec;
  805                 tv[0].tv_usec = ltv[0].tv_usec;
  806                 tv[1].tv_sec = ltv[1].tv_sec;
  807                 tv[1].tv_usec = ltv[1].tv_usec;
  808                 tvp = tv;
  809         }
  810 
  811         error = kern_utimes(td, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  812         LFREEPATH(fname);
  813         return (error);
  814 }
  815 
  816 int
  817 linux_futimesat(struct thread *td, struct linux_futimesat_args *args)
  818 {
  819         l_timeval ltv[2];
  820         struct timeval tv[2], *tvp = NULL;
  821         char *fname;
  822         int error, dfd;
  823 
  824         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  825         LCONVPATHEXIST_AT(td, args->filename, &fname, dfd);
  826 
  827 #ifdef DEBUG
  828         if (ldebug(futimesat))
  829                 printf(ARGS(futimesat, "%s, *"), fname);
  830 #endif
  831 
  832         if (args->utimes != NULL) {
  833                 if ((error = copyin(args->utimes, ltv, sizeof ltv))) {
  834                         LFREEPATH(fname);
  835                         return (error);
  836                 }
  837                 tv[0].tv_sec = ltv[0].tv_sec;
  838                 tv[0].tv_usec = ltv[0].tv_usec;
  839                 tv[1].tv_sec = ltv[1].tv_sec;
  840                 tv[1].tv_usec = ltv[1].tv_usec;
  841                 tvp = tv;
  842         }
  843 
  844         error = kern_utimesat(td, dfd, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  845         LFREEPATH(fname);
  846         return (error);
  847 }
  848 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
  849 
  850 int
  851 linux_common_wait(struct thread *td, int pid, int *status,
  852     int options, struct rusage *ru)
  853 {
  854         int error, tmpstat;
  855 
  856         error = kern_wait(td, pid, &tmpstat, options, ru);
  857         if (error)
  858                 return (error);
  859 
  860         if (status) {
  861                 tmpstat &= 0xffff;
  862                 if (WIFSIGNALED(tmpstat))
  863                         tmpstat = (tmpstat & 0xffffff80) |
  864                             BSD_TO_LINUX_SIGNAL(WTERMSIG(tmpstat));
  865                 else if (WIFSTOPPED(tmpstat))
  866                         tmpstat = (tmpstat & 0xffff00ff) |
  867                             (BSD_TO_LINUX_SIGNAL(WSTOPSIG(tmpstat)) << 8);
  868                 error = copyout(&tmpstat, status, sizeof(int));
  869         }
  870 
  871         return (error);
  872 }
  873 
  874 int
  875 linux_waitpid(struct thread *td, struct linux_waitpid_args *args)
  876 {
  877         int options;
  878  
  879 #ifdef DEBUG
  880         if (ldebug(waitpid))
  881                 printf(ARGS(waitpid, "%d, %p, %d"),
  882                     args->pid, (void *)args->status, args->options);
  883 #endif
  884         /*
  885          * this is necessary because the test in kern_wait doesn't work
  886          * because we mess with the options here
  887          */
  888         if (args->options & ~(WUNTRACED | WNOHANG | WCONTINUED | __WCLONE))
  889                 return (EINVAL);
  890    
  891         options = (args->options & (WNOHANG | WUNTRACED));
  892         /* WLINUXCLONE should be equal to __WCLONE, but we make sure */
  893         if (args->options & __WCLONE)
  894                 options |= WLINUXCLONE;
  895 
  896         return (linux_common_wait(td, args->pid, args->status, options, NULL));
  897 }
  898 
  899 
  900 int
  901 linux_mknod(struct thread *td, struct linux_mknod_args *args)
  902 {
  903         char *path;
  904         int error;
  905 
  906         LCONVPATHCREAT(td, args->path, &path);
  907 
  908 #ifdef DEBUG
  909         if (ldebug(mknod))
  910                 printf(ARGS(mknod, "%s, %d, %d"), path, args->mode, args->dev);
  911 #endif
  912 
  913         switch (args->mode & S_IFMT) {
  914         case S_IFIFO:
  915         case S_IFSOCK:
  916                 error = kern_mkfifo(td, path, UIO_SYSSPACE, args->mode);
  917                 break;
  918 
  919         case S_IFCHR:
  920         case S_IFBLK:
  921                 error = kern_mknod(td, path, UIO_SYSSPACE, args->mode,
  922                     args->dev);
  923                 break;
  924 
  925         case S_IFDIR:
  926                 error = EPERM;
  927                 break;
  928 
  929         case 0:
  930                 args->mode |= S_IFREG;
  931                 /* FALLTHROUGH */
  932         case S_IFREG:
  933                 error = kern_open(td, path, UIO_SYSSPACE,
  934                     O_WRONLY | O_CREAT | O_TRUNC, args->mode);
  935                 if (error == 0)
  936                         kern_close(td, td->td_retval[0]);
  937                 break;
  938 
  939         default:
  940                 error = EINVAL;
  941                 break;
  942         }
  943         LFREEPATH(path);
  944         return (error);
  945 }
  946 
  947 int
  948 linux_mknodat(struct thread *td, struct linux_mknodat_args *args)
  949 {
  950         char *path;
  951         int error, dfd;
  952 
  953         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  954         LCONVPATHCREAT_AT(td, args->filename, &path, dfd);
  955 
  956 #ifdef DEBUG
  957         if (ldebug(mknodat))
  958                 printf(ARGS(mknodat, "%s, %d, %d"), path, args->mode, args->dev);
  959 #endif
  960 
  961         switch (args->mode & S_IFMT) {
  962         case S_IFIFO:
  963         case S_IFSOCK:
  964                 error = kern_mkfifoat(td, dfd, path, UIO_SYSSPACE, args->mode);
  965                 break;
  966 
  967         case S_IFCHR:
  968         case S_IFBLK:
  969                 error = kern_mknodat(td, dfd, path, UIO_SYSSPACE, args->mode,
  970                     args->dev);
  971                 break;
  972 
  973         case S_IFDIR:
  974                 error = EPERM;
  975                 break;
  976 
  977         case 0:
  978                 args->mode |= S_IFREG;
  979                 /* FALLTHROUGH */
  980         case S_IFREG:
  981                 error = kern_openat(td, dfd, path, UIO_SYSSPACE,
  982                     O_WRONLY | O_CREAT | O_TRUNC, args->mode);
  983                 if (error == 0)
  984                         kern_close(td, td->td_retval[0]);
  985                 break;
  986 
  987         default:
  988                 error = EINVAL;
  989                 break;
  990         }
  991         LFREEPATH(path);
  992         return (error);
  993 }
  994 
  995 /*
  996  * UGH! This is just about the dumbest idea I've ever heard!!
  997  */
  998 int
  999 linux_personality(struct thread *td, struct linux_personality_args *args)
 1000 {
 1001 #ifdef DEBUG
 1002         if (ldebug(personality))
 1003                 printf(ARGS(personality, "%lu"), (unsigned long)args->per);
 1004 #endif
 1005         if (args->per != 0)
 1006                 return (EINVAL);
 1007 
 1008         /* Yes Jim, it's still a Linux... */
 1009         td->td_retval[0] = 0;
 1010         return (0);
 1011 }
 1012 
 1013 struct l_itimerval {
 1014         l_timeval it_interval;
 1015         l_timeval it_value;
 1016 };
 1017 
 1018 #define B2L_ITIMERVAL(bip, lip)                                         \
 1019         (bip)->it_interval.tv_sec = (lip)->it_interval.tv_sec;          \
 1020         (bip)->it_interval.tv_usec = (lip)->it_interval.tv_usec;        \
 1021         (bip)->it_value.tv_sec = (lip)->it_value.tv_sec;                \
 1022         (bip)->it_value.tv_usec = (lip)->it_value.tv_usec;
 1023 
 1024 int
 1025 linux_setitimer(struct thread *td, struct linux_setitimer_args *uap)
 1026 {
 1027         int error;
 1028         struct l_itimerval ls;
 1029         struct itimerval aitv, oitv;
 1030 
 1031 #ifdef DEBUG
 1032         if (ldebug(setitimer))
 1033                 printf(ARGS(setitimer, "%p, %p"),
 1034                     (void *)uap->itv, (void *)uap->oitv);
 1035 #endif
 1036 
 1037         if (uap->itv == NULL) {
 1038                 uap->itv = uap->oitv;
 1039                 return (linux_getitimer(td, (struct linux_getitimer_args *)uap));
 1040         }
 1041 
 1042         error = copyin(uap->itv, &ls, sizeof(ls));
 1043         if (error != 0)
 1044                 return (error);
 1045         B2L_ITIMERVAL(&aitv, &ls);
 1046 #ifdef DEBUG
 1047         if (ldebug(setitimer)) {
 1048                 printf("setitimer: value: sec: %jd, usec: %ld\n",
 1049                     (intmax_t)aitv.it_value.tv_sec, aitv.it_value.tv_usec);
 1050                 printf("setitimer: interval: sec: %jd, usec: %ld\n",
 1051                     (intmax_t)aitv.it_interval.tv_sec, aitv.it_interval.tv_usec);
 1052         }
 1053 #endif
 1054         error = kern_setitimer(td, uap->which, &aitv, &oitv);
 1055         if (error != 0 || uap->oitv == NULL)
 1056                 return (error);
 1057         B2L_ITIMERVAL(&ls, &oitv);
 1058 
 1059         return (copyout(&ls, uap->oitv, sizeof(ls)));
 1060 }
 1061 
 1062 int
 1063 linux_getitimer(struct thread *td, struct linux_getitimer_args *uap)
 1064 {
 1065         int error;
 1066         struct l_itimerval ls;
 1067         struct itimerval aitv;
 1068 
 1069 #ifdef DEBUG
 1070         if (ldebug(getitimer))
 1071                 printf(ARGS(getitimer, "%p"), (void *)uap->itv);
 1072 #endif
 1073         error = kern_getitimer(td, uap->which, &aitv);
 1074         if (error != 0)
 1075                 return (error);
 1076         B2L_ITIMERVAL(&ls, &aitv);
 1077         return (copyout(&ls, uap->itv, sizeof(ls)));
 1078 }
 1079 
 1080 int
 1081 linux_nice(struct thread *td, struct linux_nice_args *args)
 1082 {
 1083         struct setpriority_args bsd_args;
 1084 
 1085         bsd_args.which = PRIO_PROCESS;
 1086         bsd_args.who = 0;               /* current process */
 1087         bsd_args.prio = args->inc;
 1088         return (sys_setpriority(td, &bsd_args));
 1089 }
 1090 
 1091 int
 1092 linux_setgroups(struct thread *td, struct linux_setgroups_args *args)
 1093 {
 1094         struct ucred *newcred, *oldcred;
 1095         l_gid_t *linux_gidset;
 1096         gid_t *bsd_gidset;
 1097         int ngrp, error;
 1098         struct proc *p;
 1099 
 1100         ngrp = args->gidsetsize;
 1101         if (ngrp < 0 || ngrp >= ngroups_max + 1)
 1102                 return (EINVAL);
 1103         linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_TEMP, M_WAITOK);
 1104         error = copyin(args->grouplist, linux_gidset, ngrp * sizeof(l_gid_t));
 1105         if (error)
 1106                 goto out;
 1107         newcred = crget();
 1108         p = td->td_proc;
 1109         PROC_LOCK(p);
 1110         oldcred = crcopysafe(p, newcred);
 1111 
 1112         /*
 1113          * cr_groups[0] holds egid. Setting the whole set from
 1114          * the supplied set will cause egid to be changed too.
 1115          * Keep cr_groups[0] unchanged to prevent that.
 1116          */
 1117 
 1118         if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) {
 1119                 PROC_UNLOCK(p);
 1120                 crfree(newcred);
 1121                 goto out;
 1122         }
 1123 
 1124         if (ngrp > 0) {
 1125                 newcred->cr_ngroups = ngrp + 1;
 1126 
 1127                 bsd_gidset = newcred->cr_groups;
 1128                 ngrp--;
 1129                 while (ngrp >= 0) {
 1130                         bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
 1131                         ngrp--;
 1132                 }
 1133         } else
 1134                 newcred->cr_ngroups = 1;
 1135 
 1136         setsugid(p);
 1137         p->p_ucred = newcred;
 1138         PROC_UNLOCK(p);
 1139         crfree(oldcred);
 1140         error = 0;
 1141 out:
 1142         free(linux_gidset, M_TEMP);
 1143         return (error);
 1144 }
 1145 
 1146 int
 1147 linux_getgroups(struct thread *td, struct linux_getgroups_args *args)
 1148 {
 1149         struct ucred *cred;
 1150         l_gid_t *linux_gidset;
 1151         gid_t *bsd_gidset;
 1152         int bsd_gidsetsz, ngrp, error;
 1153 
 1154         cred = td->td_ucred;
 1155         bsd_gidset = cred->cr_groups;
 1156         bsd_gidsetsz = cred->cr_ngroups - 1;
 1157 
 1158         /*
 1159          * cr_groups[0] holds egid. Returning the whole set
 1160          * here will cause a duplicate. Exclude cr_groups[0]
 1161          * to prevent that.
 1162          */
 1163 
 1164         if ((ngrp = args->gidsetsize) == 0) {
 1165                 td->td_retval[0] = bsd_gidsetsz;
 1166                 return (0);
 1167         }
 1168 
 1169         if (ngrp < bsd_gidsetsz)
 1170                 return (EINVAL);
 1171 
 1172         ngrp = 0;
 1173         linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset),
 1174             M_TEMP, M_WAITOK);
 1175         while (ngrp < bsd_gidsetsz) {
 1176                 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
 1177                 ngrp++;
 1178         }
 1179 
 1180         error = copyout(linux_gidset, args->grouplist, ngrp * sizeof(l_gid_t));
 1181         free(linux_gidset, M_TEMP);
 1182         if (error)
 1183                 return (error);
 1184 
 1185         td->td_retval[0] = ngrp;
 1186         return (0);
 1187 }
 1188 
 1189 int
 1190 linux_setrlimit(struct thread *td, struct linux_setrlimit_args *args)
 1191 {
 1192         struct rlimit bsd_rlim;
 1193         struct l_rlimit rlim;
 1194         u_int which;
 1195         int error;
 1196 
 1197 #ifdef DEBUG
 1198         if (ldebug(setrlimit))
 1199                 printf(ARGS(setrlimit, "%d, %p"),
 1200                     args->resource, (void *)args->rlim);
 1201 #endif
 1202 
 1203         if (args->resource >= LINUX_RLIM_NLIMITS)
 1204                 return (EINVAL);
 1205 
 1206         which = linux_to_bsd_resource[args->resource];
 1207         if (which == -1)
 1208                 return (EINVAL);
 1209 
 1210         error = copyin(args->rlim, &rlim, sizeof(rlim));
 1211         if (error)
 1212                 return (error);
 1213 
 1214         bsd_rlim.rlim_cur = (rlim_t)rlim.rlim_cur;
 1215         bsd_rlim.rlim_max = (rlim_t)rlim.rlim_max;
 1216         return (kern_setrlimit(td, which, &bsd_rlim));
 1217 }
 1218 
 1219 int
 1220 linux_old_getrlimit(struct thread *td, struct linux_old_getrlimit_args *args)
 1221 {
 1222         struct l_rlimit rlim;
 1223         struct proc *p = td->td_proc;
 1224         struct rlimit bsd_rlim;
 1225         u_int which;
 1226 
 1227 #ifdef DEBUG
 1228         if (ldebug(old_getrlimit))
 1229                 printf(ARGS(old_getrlimit, "%d, %p"),
 1230                     args->resource, (void *)args->rlim);
 1231 #endif
 1232 
 1233         if (args->resource >= LINUX_RLIM_NLIMITS)
 1234                 return (EINVAL);
 1235 
 1236         which = linux_to_bsd_resource[args->resource];
 1237         if (which == -1)
 1238                 return (EINVAL);
 1239 
 1240         PROC_LOCK(p);
 1241         lim_rlimit(p, which, &bsd_rlim);
 1242         PROC_UNLOCK(p);
 1243 
 1244 #ifdef COMPAT_LINUX32
 1245         rlim.rlim_cur = (unsigned int)bsd_rlim.rlim_cur;
 1246         if (rlim.rlim_cur == UINT_MAX)
 1247                 rlim.rlim_cur = INT_MAX;
 1248         rlim.rlim_max = (unsigned int)bsd_rlim.rlim_max;
 1249         if (rlim.rlim_max == UINT_MAX)
 1250                 rlim.rlim_max = INT_MAX;
 1251 #else
 1252         rlim.rlim_cur = (unsigned long)bsd_rlim.rlim_cur;
 1253         if (rlim.rlim_cur == ULONG_MAX)
 1254                 rlim.rlim_cur = LONG_MAX;
 1255         rlim.rlim_max = (unsigned long)bsd_rlim.rlim_max;
 1256         if (rlim.rlim_max == ULONG_MAX)
 1257                 rlim.rlim_max = LONG_MAX;
 1258 #endif
 1259         return (copyout(&rlim, args->rlim, sizeof(rlim)));
 1260 }
 1261 
 1262 int
 1263 linux_getrlimit(struct thread *td, struct linux_getrlimit_args *args)
 1264 {
 1265         struct l_rlimit rlim;
 1266         struct proc *p = td->td_proc;
 1267         struct rlimit bsd_rlim;
 1268         u_int which;
 1269 
 1270 #ifdef DEBUG
 1271         if (ldebug(getrlimit))
 1272                 printf(ARGS(getrlimit, "%d, %p"),
 1273                     args->resource, (void *)args->rlim);
 1274 #endif
 1275 
 1276         if (args->resource >= LINUX_RLIM_NLIMITS)
 1277                 return (EINVAL);
 1278 
 1279         which = linux_to_bsd_resource[args->resource];
 1280         if (which == -1)
 1281                 return (EINVAL);
 1282 
 1283         PROC_LOCK(p);
 1284         lim_rlimit(p, which, &bsd_rlim);
 1285         PROC_UNLOCK(p);
 1286 
 1287         rlim.rlim_cur = (l_ulong)bsd_rlim.rlim_cur;
 1288         rlim.rlim_max = (l_ulong)bsd_rlim.rlim_max;
 1289         return (copyout(&rlim, args->rlim, sizeof(rlim)));
 1290 }
 1291 
 1292 int
 1293 linux_sched_setscheduler(struct thread *td,
 1294     struct linux_sched_setscheduler_args *args)
 1295 {
 1296         struct sched_setscheduler_args bsd;
 1297 
 1298 #ifdef DEBUG
 1299         if (ldebug(sched_setscheduler))
 1300                 printf(ARGS(sched_setscheduler, "%d, %d, %p"),
 1301                     args->pid, args->policy, (const void *)args->param);
 1302 #endif
 1303 
 1304         switch (args->policy) {
 1305         case LINUX_SCHED_OTHER:
 1306                 bsd.policy = SCHED_OTHER;
 1307                 break;
 1308         case LINUX_SCHED_FIFO:
 1309                 bsd.policy = SCHED_FIFO;
 1310                 break;
 1311         case LINUX_SCHED_RR:
 1312                 bsd.policy = SCHED_RR;
 1313                 break;
 1314         default:
 1315                 return (EINVAL);
 1316         }
 1317 
 1318         bsd.pid = args->pid;
 1319         bsd.param = (struct sched_param *)args->param;
 1320         return (sys_sched_setscheduler(td, &bsd));
 1321 }
 1322 
 1323 int
 1324 linux_sched_getscheduler(struct thread *td,
 1325     struct linux_sched_getscheduler_args *args)
 1326 {
 1327         struct sched_getscheduler_args bsd;
 1328         int error;
 1329 
 1330 #ifdef DEBUG
 1331         if (ldebug(sched_getscheduler))
 1332                 printf(ARGS(sched_getscheduler, "%d"), args->pid);
 1333 #endif
 1334 
 1335         bsd.pid = args->pid;
 1336         error = sys_sched_getscheduler(td, &bsd);
 1337 
 1338         switch (td->td_retval[0]) {
 1339         case SCHED_OTHER:
 1340                 td->td_retval[0] = LINUX_SCHED_OTHER;
 1341                 break;
 1342         case SCHED_FIFO:
 1343                 td->td_retval[0] = LINUX_SCHED_FIFO;
 1344                 break;
 1345         case SCHED_RR:
 1346                 td->td_retval[0] = LINUX_SCHED_RR;
 1347                 break;
 1348         }
 1349 
 1350         return (error);
 1351 }
 1352 
 1353 int
 1354 linux_sched_get_priority_max(struct thread *td,
 1355     struct linux_sched_get_priority_max_args *args)
 1356 {
 1357         struct sched_get_priority_max_args bsd;
 1358 
 1359 #ifdef DEBUG
 1360         if (ldebug(sched_get_priority_max))
 1361                 printf(ARGS(sched_get_priority_max, "%d"), args->policy);
 1362 #endif
 1363 
 1364         switch (args->policy) {
 1365         case LINUX_SCHED_OTHER:
 1366                 bsd.policy = SCHED_OTHER;
 1367                 break;
 1368         case LINUX_SCHED_FIFO:
 1369                 bsd.policy = SCHED_FIFO;
 1370                 break;
 1371         case LINUX_SCHED_RR:
 1372                 bsd.policy = SCHED_RR;
 1373                 break;
 1374         default:
 1375                 return (EINVAL);
 1376         }
 1377         return (sys_sched_get_priority_max(td, &bsd));
 1378 }
 1379 
 1380 int
 1381 linux_sched_get_priority_min(struct thread *td,
 1382     struct linux_sched_get_priority_min_args *args)
 1383 {
 1384         struct sched_get_priority_min_args bsd;
 1385 
 1386 #ifdef DEBUG
 1387         if (ldebug(sched_get_priority_min))
 1388                 printf(ARGS(sched_get_priority_min, "%d"), args->policy);
 1389 #endif
 1390 
 1391         switch (args->policy) {
 1392         case LINUX_SCHED_OTHER:
 1393                 bsd.policy = SCHED_OTHER;
 1394                 break;
 1395         case LINUX_SCHED_FIFO:
 1396                 bsd.policy = SCHED_FIFO;
 1397                 break;
 1398         case LINUX_SCHED_RR:
 1399                 bsd.policy = SCHED_RR;
 1400                 break;
 1401         default:
 1402                 return (EINVAL);
 1403         }
 1404         return (sys_sched_get_priority_min(td, &bsd));
 1405 }
 1406 
 1407 #define REBOOT_CAD_ON   0x89abcdef
 1408 #define REBOOT_CAD_OFF  0
 1409 #define REBOOT_HALT     0xcdef0123
 1410 #define REBOOT_RESTART  0x01234567
 1411 #define REBOOT_RESTART2 0xA1B2C3D4
 1412 #define REBOOT_POWEROFF 0x4321FEDC
 1413 #define REBOOT_MAGIC1   0xfee1dead
 1414 #define REBOOT_MAGIC2   0x28121969
 1415 #define REBOOT_MAGIC2A  0x05121996
 1416 #define REBOOT_MAGIC2B  0x16041998
 1417 
 1418 int
 1419 linux_reboot(struct thread *td, struct linux_reboot_args *args)
 1420 {
 1421         struct reboot_args bsd_args;
 1422 
 1423 #ifdef DEBUG
 1424         if (ldebug(reboot))
 1425                 printf(ARGS(reboot, "0x%x"), args->cmd);
 1426 #endif
 1427 
 1428         if (args->magic1 != REBOOT_MAGIC1)
 1429                 return (EINVAL);
 1430 
 1431         switch (args->magic2) {
 1432         case REBOOT_MAGIC2:
 1433         case REBOOT_MAGIC2A:
 1434         case REBOOT_MAGIC2B:
 1435                 break;
 1436         default:
 1437                 return (EINVAL);
 1438         }
 1439 
 1440         switch (args->cmd) {
 1441         case REBOOT_CAD_ON:
 1442         case REBOOT_CAD_OFF:
 1443                 return (priv_check(td, PRIV_REBOOT));
 1444         case REBOOT_HALT:
 1445                 bsd_args.opt = RB_HALT;
 1446                 break;
 1447         case REBOOT_RESTART:
 1448         case REBOOT_RESTART2:
 1449                 bsd_args.opt = 0;
 1450                 break;
 1451         case REBOOT_POWEROFF:
 1452                 bsd_args.opt = RB_POWEROFF;
 1453                 break;
 1454         default:
 1455                 return (EINVAL);
 1456         }
 1457         return (sys_reboot(td, &bsd_args));
 1458 }
 1459 
 1460 
 1461 /*
 1462  * The FreeBSD native getpid(2), getgid(2) and getuid(2) also modify
 1463  * td->td_retval[1] when COMPAT_43 is defined. This clobbers registers that
 1464  * are assumed to be preserved. The following lightweight syscalls fixes
 1465  * this. See also linux_getgid16() and linux_getuid16() in linux_uid16.c
 1466  *
 1467  * linux_getpid() - MP SAFE
 1468  * linux_getgid() - MP SAFE
 1469  * linux_getuid() - MP SAFE
 1470  */
 1471 
 1472 int
 1473 linux_getpid(struct thread *td, struct linux_getpid_args *args)
 1474 {
 1475         struct linux_emuldata *em;
 1476 
 1477 #ifdef DEBUG
 1478         if (ldebug(getpid))
 1479                 printf(ARGS(getpid, ""));
 1480 #endif
 1481 
 1482         if (linux_use26(td)) {
 1483                 em = em_find(td->td_proc, EMUL_DONTLOCK);
 1484                 KASSERT(em != NULL, ("getpid: emuldata not found.\n"));
 1485                 td->td_retval[0] = em->shared->group_pid;
 1486         } else {
 1487                 td->td_retval[0] = td->td_proc->p_pid;
 1488         }
 1489 
 1490         return (0);
 1491 }
 1492 
 1493 int
 1494 linux_gettid(struct thread *td, struct linux_gettid_args *args)
 1495 {
 1496 
 1497 #ifdef DEBUG
 1498         if (ldebug(gettid))
 1499                 printf(ARGS(gettid, ""));
 1500 #endif
 1501 
 1502         td->td_retval[0] = td->td_proc->p_pid;
 1503         return (0);
 1504 }
 1505 
 1506 
 1507 int
 1508 linux_getppid(struct thread *td, struct linux_getppid_args *args)
 1509 {
 1510         struct linux_emuldata *em;
 1511         struct proc *p, *pp;
 1512 
 1513 #ifdef DEBUG
 1514         if (ldebug(getppid))
 1515                 printf(ARGS(getppid, ""));
 1516 #endif
 1517 
 1518         if (!linux_use26(td)) {
 1519                 PROC_LOCK(td->td_proc);
 1520                 td->td_retval[0] = td->td_proc->p_pptr->p_pid;
 1521                 PROC_UNLOCK(td->td_proc);
 1522                 return (0);
 1523         }
 1524 
 1525         em = em_find(td->td_proc, EMUL_DONTLOCK);
 1526 
 1527         KASSERT(em != NULL, ("getppid: process emuldata not found.\n"));
 1528 
 1529         /* find the group leader */
 1530         p = pfind(em->shared->group_pid);
 1531 
 1532         if (p == NULL) {
 1533 #ifdef DEBUG
 1534                 printf(LMSG("parent process not found.\n"));
 1535 #endif
 1536                 return (0);
 1537         }
 1538 
 1539         pp = p->p_pptr;         /* switch to parent */
 1540         PROC_LOCK(pp);
 1541         PROC_UNLOCK(p);
 1542 
 1543         /* if its also linux process */
 1544         if (pp->p_sysent == &elf_linux_sysvec) {
 1545                 em = em_find(pp, EMUL_DONTLOCK);
 1546                 KASSERT(em != NULL, ("getppid: parent emuldata not found.\n"));
 1547 
 1548                 td->td_retval[0] = em->shared->group_pid;
 1549         } else
 1550                 td->td_retval[0] = pp->p_pid;
 1551 
 1552         PROC_UNLOCK(pp);
 1553 
 1554         return (0);
 1555 }
 1556 
 1557 int
 1558 linux_getgid(struct thread *td, struct linux_getgid_args *args)
 1559 {
 1560 
 1561 #ifdef DEBUG
 1562         if (ldebug(getgid))
 1563                 printf(ARGS(getgid, ""));
 1564 #endif
 1565 
 1566         td->td_retval[0] = td->td_ucred->cr_rgid;
 1567         return (0);
 1568 }
 1569 
 1570 int
 1571 linux_getuid(struct thread *td, struct linux_getuid_args *args)
 1572 {
 1573 
 1574 #ifdef DEBUG
 1575         if (ldebug(getuid))
 1576                 printf(ARGS(getuid, ""));
 1577 #endif
 1578 
 1579         td->td_retval[0] = td->td_ucred->cr_ruid;
 1580         return (0);
 1581 }
 1582 
 1583 
 1584 int
 1585 linux_getsid(struct thread *td, struct linux_getsid_args *args)
 1586 {
 1587         struct getsid_args bsd;
 1588 
 1589 #ifdef DEBUG
 1590         if (ldebug(getsid))
 1591                 printf(ARGS(getsid, "%i"), args->pid);
 1592 #endif
 1593 
 1594         bsd.pid = args->pid;
 1595         return (sys_getsid(td, &bsd));
 1596 }
 1597 
 1598 int
 1599 linux_nosys(struct thread *td, struct nosys_args *ignore)
 1600 {
 1601 
 1602         return (ENOSYS);
 1603 }
 1604 
 1605 int
 1606 linux_getpriority(struct thread *td, struct linux_getpriority_args *args)
 1607 {
 1608         struct getpriority_args bsd_args;
 1609         int error;
 1610 
 1611 #ifdef DEBUG
 1612         if (ldebug(getpriority))
 1613                 printf(ARGS(getpriority, "%i, %i"), args->which, args->who);
 1614 #endif
 1615 
 1616         bsd_args.which = args->which;
 1617         bsd_args.who = args->who;
 1618         error = sys_getpriority(td, &bsd_args);
 1619         td->td_retval[0] = 20 - td->td_retval[0];
 1620         return (error);
 1621 }
 1622 
 1623 int
 1624 linux_sethostname(struct thread *td, struct linux_sethostname_args *args)
 1625 {
 1626         int name[2];
 1627 
 1628 #ifdef DEBUG
 1629         if (ldebug(sethostname))
 1630                 printf(ARGS(sethostname, "*, %i"), args->len);
 1631 #endif
 1632 
 1633         name[0] = CTL_KERN;
 1634         name[1] = KERN_HOSTNAME;
 1635         return (userland_sysctl(td, name, 2, 0, 0, 0, args->hostname,
 1636             args->len, 0, 0));
 1637 }
 1638 
 1639 int
 1640 linux_setdomainname(struct thread *td, struct linux_setdomainname_args *args)
 1641 {
 1642         int name[2];
 1643 
 1644 #ifdef DEBUG
 1645         if (ldebug(setdomainname))
 1646                 printf(ARGS(setdomainname, "*, %i"), args->len);
 1647 #endif
 1648 
 1649         name[0] = CTL_KERN;
 1650         name[1] = KERN_NISDOMAINNAME;
 1651         return (userland_sysctl(td, name, 2, 0, 0, 0, args->name,
 1652             args->len, 0, 0));
 1653 }
 1654 
 1655 int
 1656 linux_exit_group(struct thread *td, struct linux_exit_group_args *args)
 1657 {
 1658         struct linux_emuldata *em;
 1659 
 1660 #ifdef DEBUG
 1661         if (ldebug(exit_group))
 1662                 printf(ARGS(exit_group, "%i"), args->error_code);
 1663 #endif
 1664 
 1665         em = em_find(td->td_proc, EMUL_DONTLOCK);
 1666         if (em->shared->refs > 1) {
 1667                 EMUL_SHARED_WLOCK(&emul_shared_lock);
 1668                 em->shared->flags |= EMUL_SHARED_HASXSTAT;
 1669                 em->shared->xstat = W_EXITCODE(args->error_code, 0);
 1670                 EMUL_SHARED_WUNLOCK(&emul_shared_lock);
 1671                 if (linux_use26(td))
 1672                         linux_kill_threads(td, SIGKILL);
 1673         }
 1674 
 1675         /*
 1676          * XXX: we should send a signal to the parent if
 1677          * SIGNAL_EXIT_GROUP is set. We ignore that (temporarily?)
 1678          * as it doesnt occur often.
 1679          */
 1680         exit1(td, W_EXITCODE(args->error_code, 0));
 1681 
 1682         return (0);
 1683 }
 1684 
 1685 #define _LINUX_CAPABILITY_VERSION  0x19980330
 1686 
 1687 struct l_user_cap_header {
 1688         l_int   version;
 1689         l_int   pid;
 1690 };
 1691 
 1692 struct l_user_cap_data {
 1693         l_int   effective;
 1694         l_int   permitted;
 1695         l_int   inheritable;
 1696 };
 1697 
 1698 int
 1699 linux_capget(struct thread *td, struct linux_capget_args *args)
 1700 {
 1701         struct l_user_cap_header luch;
 1702         struct l_user_cap_data lucd;
 1703         int error;
 1704 
 1705         if (args->hdrp == NULL)
 1706                 return (EFAULT);
 1707 
 1708         error = copyin(args->hdrp, &luch, sizeof(luch));
 1709         if (error != 0)
 1710                 return (error);
 1711 
 1712         if (luch.version != _LINUX_CAPABILITY_VERSION) {
 1713                 luch.version = _LINUX_CAPABILITY_VERSION;
 1714                 error = copyout(&luch, args->hdrp, sizeof(luch));
 1715                 if (error)
 1716                         return (error);
 1717                 return (EINVAL);
 1718         }
 1719 
 1720         if (luch.pid)
 1721                 return (EPERM);
 1722 
 1723         if (args->datap) {
 1724                 /*
 1725                  * The current implementation doesn't support setting
 1726                  * a capability (it's essentially a stub) so indicate
 1727                  * that no capabilities are currently set or available
 1728                  * to request.
 1729                  */
 1730                 bzero (&lucd, sizeof(lucd));
 1731                 error = copyout(&lucd, args->datap, sizeof(lucd));
 1732         }
 1733 
 1734         return (error);
 1735 }
 1736 
 1737 int
 1738 linux_capset(struct thread *td, struct linux_capset_args *args)
 1739 {
 1740         struct l_user_cap_header luch;
 1741         struct l_user_cap_data lucd;
 1742         int error;
 1743 
 1744         if (args->hdrp == NULL || args->datap == NULL)
 1745                 return (EFAULT);
 1746 
 1747         error = copyin(args->hdrp, &luch, sizeof(luch));
 1748         if (error != 0)
 1749                 return (error);
 1750 
 1751         if (luch.version != _LINUX_CAPABILITY_VERSION) {
 1752                 luch.version = _LINUX_CAPABILITY_VERSION;
 1753                 error = copyout(&luch, args->hdrp, sizeof(luch));
 1754                 if (error)
 1755                         return (error);
 1756                 return (EINVAL);
 1757         }
 1758 
 1759         if (luch.pid)
 1760                 return (EPERM);
 1761 
 1762         error = copyin(args->datap, &lucd, sizeof(lucd));
 1763         if (error != 0)
 1764                 return (error);
 1765 
 1766         /* We currently don't support setting any capabilities. */
 1767         if (lucd.effective || lucd.permitted || lucd.inheritable) {
 1768                 linux_msg(td,
 1769                           "capset effective=0x%x, permitted=0x%x, "
 1770                           "inheritable=0x%x is not implemented",
 1771                           (int)lucd.effective, (int)lucd.permitted,
 1772                           (int)lucd.inheritable);
 1773                 return (EPERM);
 1774         }
 1775 
 1776         return (0);
 1777 }
 1778 
 1779 int
 1780 linux_prctl(struct thread *td, struct linux_prctl_args *args)
 1781 {
 1782         int error = 0, max_size;
 1783         struct proc *p = td->td_proc;
 1784         char comm[LINUX_MAX_COMM_LEN];
 1785         struct linux_emuldata *em;
 1786         int pdeath_signal;
 1787 
 1788 #ifdef DEBUG
 1789         if (ldebug(prctl))
 1790                 printf(ARGS(prctl, "%d, %d, %d, %d, %d"), args->option,
 1791                     args->arg2, args->arg3, args->arg4, args->arg5);
 1792 #endif
 1793 
 1794         switch (args->option) {
 1795         case LINUX_PR_SET_PDEATHSIG:
 1796                 if (!LINUX_SIG_VALID(args->arg2))
 1797                         return (EINVAL);
 1798                 em = em_find(p, EMUL_DOLOCK);
 1799                 KASSERT(em != NULL, ("prctl: emuldata not found.\n"));
 1800                 em->pdeath_signal = args->arg2;
 1801                 EMUL_UNLOCK(&emul_lock);
 1802                 break;
 1803         case LINUX_PR_GET_PDEATHSIG:
 1804                 em = em_find(p, EMUL_DOLOCK);
 1805                 KASSERT(em != NULL, ("prctl: emuldata not found.\n"));
 1806                 pdeath_signal = em->pdeath_signal;
 1807                 EMUL_UNLOCK(&emul_lock);
 1808                 error = copyout(&pdeath_signal,
 1809                     (void *)(register_t)args->arg2,
 1810                     sizeof(pdeath_signal));
 1811                 break;
 1812         case LINUX_PR_GET_KEEPCAPS:
 1813                 /*
 1814                  * Indicate that we always clear the effective and
 1815                  * permitted capability sets when the user id becomes
 1816                  * non-zero (actually the capability sets are simply
 1817                  * always zero in the current implementation).
 1818                  */
 1819                 td->td_retval[0] = 0;
 1820                 break;
 1821         case LINUX_PR_SET_KEEPCAPS:
 1822                 /*
 1823                  * Ignore requests to keep the effective and permitted
 1824                  * capability sets when the user id becomes non-zero.
 1825                  */
 1826                 break;
 1827         case LINUX_PR_SET_NAME:
 1828                 /*
 1829                  * To be on the safe side we need to make sure to not
 1830                  * overflow the size a linux program expects. We already
 1831                  * do this here in the copyin, so that we don't need to
 1832                  * check on copyout.
 1833                  */
 1834                 max_size = MIN(sizeof(comm), sizeof(p->p_comm));
 1835                 error = copyinstr((void *)(register_t)args->arg2, comm,
 1836                     max_size, NULL);
 1837 
 1838                 /* Linux silently truncates the name if it is too long. */
 1839                 if (error == ENAMETOOLONG) {
 1840                         /*
 1841                          * XXX: copyinstr() isn't documented to populate the
 1842                          * array completely, so do a copyin() to be on the
 1843                          * safe side. This should be changed in case
 1844                          * copyinstr() is changed to guarantee this.
 1845                          */
 1846                         error = copyin((void *)(register_t)args->arg2, comm,
 1847                             max_size - 1);
 1848                         comm[max_size - 1] = '\0';
 1849                 }
 1850                 if (error)
 1851                         return (error);
 1852 
 1853                 PROC_LOCK(p);
 1854                 strlcpy(p->p_comm, comm, sizeof(p->p_comm));
 1855                 PROC_UNLOCK(p);
 1856                 break;
 1857         case LINUX_PR_GET_NAME:
 1858                 PROC_LOCK(p);
 1859                 strlcpy(comm, p->p_comm, sizeof(comm));
 1860                 PROC_UNLOCK(p);
 1861                 error = copyout(comm, (void *)(register_t)args->arg2,
 1862                     strlen(comm) + 1);
 1863                 break;
 1864         default:
 1865                 error = EINVAL;
 1866                 break;
 1867         }
 1868 
 1869         return (error);
 1870 }
 1871 
 1872 /*
 1873  * Get affinity of a process.
 1874  */
 1875 int
 1876 linux_sched_getaffinity(struct thread *td,
 1877     struct linux_sched_getaffinity_args *args)
 1878 {
 1879         int error;
 1880         struct cpuset_getaffinity_args cga;
 1881 
 1882 #ifdef DEBUG
 1883         if (ldebug(sched_getaffinity))
 1884                 printf(ARGS(sched_getaffinity, "%d, %d, *"), args->pid,
 1885                     args->len);
 1886 #endif
 1887         if (args->len < sizeof(cpuset_t))
 1888                 return (EINVAL);
 1889 
 1890         cga.level = CPU_LEVEL_WHICH;
 1891         cga.which = CPU_WHICH_PID;
 1892         cga.id = args->pid;
 1893         cga.cpusetsize = sizeof(cpuset_t);
 1894         cga.mask = (cpuset_t *) args->user_mask_ptr;
 1895 
 1896         if ((error = sys_cpuset_getaffinity(td, &cga)) == 0)
 1897                 td->td_retval[0] = sizeof(cpuset_t);
 1898 
 1899         return (error);
 1900 }
 1901 
 1902 /*
 1903  *  Set affinity of a process.
 1904  */
 1905 int
 1906 linux_sched_setaffinity(struct thread *td,
 1907     struct linux_sched_setaffinity_args *args)
 1908 {
 1909         struct cpuset_setaffinity_args csa;
 1910 
 1911 #ifdef DEBUG
 1912         if (ldebug(sched_setaffinity))
 1913                 printf(ARGS(sched_setaffinity, "%d, %d, *"), args->pid,
 1914                     args->len);
 1915 #endif
 1916         if (args->len < sizeof(cpuset_t))
 1917                 return (EINVAL);
 1918 
 1919         csa.level = CPU_LEVEL_WHICH;
 1920         csa.which = CPU_WHICH_PID;
 1921         csa.id = args->pid;
 1922         csa.cpusetsize = sizeof(cpuset_t);
 1923         csa.mask = (cpuset_t *) args->user_mask_ptr;
 1924 
 1925         return (sys_cpuset_setaffinity(td, &csa));
 1926 }

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