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/10.2/sys/compat/linux/linux_misc.c 301051 2016-05-31 16:55:45Z glebius $");
   32 
   33 #include "opt_compat.h"
   34 #include "opt_kdtrace.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/blist.h>
   38 #include <sys/fcntl.h>
   39 #if defined(__i386__)
   40 #include <sys/imgact_aout.h>
   41 #endif
   42 #include <sys/jail.h>
   43 #include <sys/kernel.h>
   44 #include <sys/limits.h>
   45 #include <sys/lock.h>
   46 #include <sys/malloc.h>
   47 #include <sys/mman.h>
   48 #include <sys/mount.h>
   49 #include <sys/mutex.h>
   50 #include <sys/namei.h>
   51 #include <sys/priv.h>
   52 #include <sys/proc.h>
   53 #include <sys/reboot.h>
   54 #include <sys/racct.h>
   55 #include <sys/resourcevar.h>
   56 #include <sys/sched.h>
   57 #include <sys/sdt.h>
   58 #include <sys/signalvar.h>
   59 #include <sys/stat.h>
   60 #include <sys/syscallsubr.h>
   61 #include <sys/sysctl.h>
   62 #include <sys/sysproto.h>
   63 #include <sys/systm.h>
   64 #include <sys/time.h>
   65 #include <sys/vmmeter.h>
   66 #include <sys/vnode.h>
   67 #include <sys/wait.h>
   68 #include <sys/cpuset.h>
   69 
   70 #include <security/mac/mac_framework.h>
   71 
   72 #include <vm/vm.h>
   73 #include <vm/pmap.h>
   74 #include <vm/vm_kern.h>
   75 #include <vm/vm_map.h>
   76 #include <vm/vm_extern.h>
   77 #include <vm/vm_object.h>
   78 #include <vm/swap_pager.h>
   79 
   80 #ifdef COMPAT_LINUX32
   81 #include <machine/../linux32/linux.h>
   82 #include <machine/../linux32/linux32_proto.h>
   83 #else
   84 #include <machine/../linux/linux.h>
   85 #include <machine/../linux/linux_proto.h>
   86 #endif
   87 
   88 #include <compat/linux/linux_dtrace.h>
   89 #include <compat/linux/linux_file.h>
   90 #include <compat/linux/linux_mib.h>
   91 #include <compat/linux/linux_signal.h>
   92 #include <compat/linux/linux_util.h>
   93 #include <compat/linux/linux_sysproto.h>
   94 #include <compat/linux/linux_emul.h>
   95 #include <compat/linux/linux_misc.h>
   96 
   97 /* DTrace init */
   98 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
   99 
  100 /* Linuxulator-global DTrace probes */
  101 LIN_SDT_PROBE_DECLARE(locks, emul_lock, locked);
  102 LIN_SDT_PROBE_DECLARE(locks, emul_lock, unlock);
  103 LIN_SDT_PROBE_DECLARE(locks, emul_shared_rlock, locked);
  104 LIN_SDT_PROBE_DECLARE(locks, emul_shared_rlock, unlock);
  105 LIN_SDT_PROBE_DECLARE(locks, emul_shared_wlock, locked);
  106 LIN_SDT_PROBE_DECLARE(locks, emul_shared_wlock, unlock);
  107 
  108 int stclohz;                            /* Statistics clock frequency */
  109 
  110 static unsigned int linux_to_bsd_resource[LINUX_RLIM_NLIMITS] = {
  111         RLIMIT_CPU, RLIMIT_FSIZE, RLIMIT_DATA, RLIMIT_STACK,
  112         RLIMIT_CORE, RLIMIT_RSS, RLIMIT_NPROC, RLIMIT_NOFILE,
  113         RLIMIT_MEMLOCK, RLIMIT_AS 
  114 };
  115 
  116 struct l_sysinfo {
  117         l_long          uptime;         /* Seconds since boot */
  118         l_ulong         loads[3];       /* 1, 5, and 15 minute load averages */
  119 #define LINUX_SYSINFO_LOADS_SCALE 65536
  120         l_ulong         totalram;       /* Total usable main memory size */
  121         l_ulong         freeram;        /* Available memory size */
  122         l_ulong         sharedram;      /* Amount of shared memory */
  123         l_ulong         bufferram;      /* Memory used by buffers */
  124         l_ulong         totalswap;      /* Total swap space size */
  125         l_ulong         freeswap;       /* swap space still available */
  126         l_ushort        procs;          /* Number of current processes */
  127         l_ushort        pads;
  128         l_ulong         totalbig;
  129         l_ulong         freebig;
  130         l_uint          mem_unit;
  131         char            _f[20-2*sizeof(l_long)-sizeof(l_int)];  /* padding */
  132 };
  133 int
  134 linux_sysinfo(struct thread *td, struct linux_sysinfo_args *args)
  135 {
  136         struct l_sysinfo sysinfo;
  137         vm_object_t object;
  138         int i, j;
  139         struct timespec ts;
  140 
  141         bzero(&sysinfo, sizeof(sysinfo));
  142         getnanouptime(&ts);
  143         if (ts.tv_nsec != 0)
  144                 ts.tv_sec++;
  145         sysinfo.uptime = ts.tv_sec;
  146 
  147         /* Use the information from the mib to get our load averages */
  148         for (i = 0; i < 3; i++)
  149                 sysinfo.loads[i] = averunnable.ldavg[i] *
  150                     LINUX_SYSINFO_LOADS_SCALE / averunnable.fscale;
  151 
  152         sysinfo.totalram = physmem * PAGE_SIZE;
  153         sysinfo.freeram = sysinfo.totalram - cnt.v_wire_count * PAGE_SIZE;
  154 
  155         sysinfo.sharedram = 0;
  156         mtx_lock(&vm_object_list_mtx);
  157         TAILQ_FOREACH(object, &vm_object_list, object_list)
  158                 if (object->shadow_count > 1)
  159                         sysinfo.sharedram += object->resident_page_count;
  160         mtx_unlock(&vm_object_list_mtx);
  161 
  162         sysinfo.sharedram *= PAGE_SIZE;
  163         sysinfo.bufferram = 0;
  164 
  165         swap_pager_status(&i, &j);
  166         sysinfo.totalswap = i * PAGE_SIZE;
  167         sysinfo.freeswap = (i - j) * PAGE_SIZE;
  168 
  169         sysinfo.procs = nprocs;
  170 
  171         /* The following are only present in newer Linux kernels. */
  172         sysinfo.totalbig = 0;
  173         sysinfo.freebig = 0;
  174         sysinfo.mem_unit = 1;
  175 
  176         return (copyout(&sysinfo, args->info, sizeof(sysinfo)));
  177 }
  178 
  179 int
  180 linux_alarm(struct thread *td, struct linux_alarm_args *args)
  181 {
  182         struct itimerval it, old_it;
  183         u_int secs;
  184         int error;
  185 
  186 #ifdef DEBUG
  187         if (ldebug(alarm))
  188                 printf(ARGS(alarm, "%u"), args->secs);
  189 #endif
  190         
  191         secs = args->secs;
  192 
  193         if (secs > INT_MAX)
  194                 secs = INT_MAX;
  195 
  196         it.it_value.tv_sec = (long) secs;
  197         it.it_value.tv_usec = 0;
  198         it.it_interval.tv_sec = 0;
  199         it.it_interval.tv_usec = 0;
  200         error = kern_setitimer(td, ITIMER_REAL, &it, &old_it);
  201         if (error)
  202                 return (error);
  203         if (timevalisset(&old_it.it_value)) {
  204                 if (old_it.it_value.tv_usec != 0)
  205                         old_it.it_value.tv_sec++;
  206                 td->td_retval[0] = old_it.it_value.tv_sec;
  207         }
  208         return (0);
  209 }
  210 
  211 int
  212 linux_brk(struct thread *td, struct linux_brk_args *args)
  213 {
  214         struct vmspace *vm = td->td_proc->p_vmspace;
  215         vm_offset_t new, old;
  216         struct obreak_args /* {
  217                 char * nsize;
  218         } */ tmp;
  219 
  220 #ifdef DEBUG
  221         if (ldebug(brk))
  222                 printf(ARGS(brk, "%p"), (void *)(uintptr_t)args->dsend);
  223 #endif
  224         old = (vm_offset_t)vm->vm_daddr + ctob(vm->vm_dsize);
  225         new = (vm_offset_t)args->dsend;
  226         tmp.nsize = (char *)new;
  227         if (((caddr_t)new > vm->vm_daddr) && !sys_obreak(td, &tmp))
  228                 td->td_retval[0] = (long)new;
  229         else
  230                 td->td_retval[0] = (long)old;
  231 
  232         return (0);
  233 }
  234 
  235 #if defined(__i386__)
  236 /* XXX: what about amd64/linux32? */
  237 
  238 int
  239 linux_uselib(struct thread *td, struct linux_uselib_args *args)
  240 {
  241         struct nameidata ni;
  242         struct vnode *vp;
  243         struct exec *a_out;
  244         struct vattr attr;
  245         vm_offset_t vmaddr;
  246         unsigned long file_offset;
  247         unsigned long bss_size;
  248         char *library;
  249         ssize_t aresid;
  250         int error, locked, writecount;
  251 
  252         LCONVPATHEXIST(td, args->library, &library);
  253 
  254 #ifdef DEBUG
  255         if (ldebug(uselib))
  256                 printf(ARGS(uselib, "%s"), library);
  257 #endif
  258 
  259         a_out = NULL;
  260         locked = 0;
  261         vp = NULL;
  262 
  263         NDINIT(&ni, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | AUDITVNODE1,
  264             UIO_SYSSPACE, library, td);
  265         error = namei(&ni);
  266         LFREEPATH(library);
  267         if (error)
  268                 goto cleanup;
  269 
  270         vp = ni.ni_vp;
  271         NDFREE(&ni, NDF_ONLY_PNBUF);
  272 
  273         /*
  274          * From here on down, we have a locked vnode that must be unlocked.
  275          * XXX: The code below largely duplicates exec_check_permissions().
  276          */
  277         locked = 1;
  278 
  279         /* Writable? */
  280         error = VOP_GET_WRITECOUNT(vp, &writecount);
  281         if (error != 0)
  282                 goto cleanup;
  283         if (writecount != 0) {
  284                 error = ETXTBSY;
  285                 goto cleanup;
  286         }
  287 
  288         /* Executable? */
  289         error = VOP_GETATTR(vp, &attr, td->td_ucred);
  290         if (error)
  291                 goto cleanup;
  292 
  293         if ((vp->v_mount->mnt_flag & MNT_NOEXEC) ||
  294             ((attr.va_mode & 0111) == 0) || (attr.va_type != VREG)) {
  295                 /* EACCESS is what exec(2) returns. */
  296                 error = ENOEXEC;
  297                 goto cleanup;
  298         }
  299 
  300         /* Sensible size? */
  301         if (attr.va_size == 0) {
  302                 error = ENOEXEC;
  303                 goto cleanup;
  304         }
  305 
  306         /* Can we access it? */
  307         error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td);
  308         if (error)
  309                 goto cleanup;
  310 
  311         /*
  312          * XXX: This should use vn_open() so that it is properly authorized,
  313          * and to reduce code redundancy all over the place here.
  314          * XXX: Not really, it duplicates far more of exec_check_permissions()
  315          * than vn_open().
  316          */
  317 #ifdef MAC
  318         error = mac_vnode_check_open(td->td_ucred, vp, VREAD);
  319         if (error)
  320                 goto cleanup;
  321 #endif
  322         error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL);
  323         if (error)
  324                 goto cleanup;
  325 
  326         /* Pull in executable header into exec_map */
  327         error = vm_mmap(exec_map, (vm_offset_t *)&a_out, PAGE_SIZE,
  328             VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE, vp, 0);
  329         if (error)
  330                 goto cleanup;
  331 
  332         /* Is it a Linux binary ? */
  333         if (((a_out->a_magic >> 16) & 0xff) != 0x64) {
  334                 error = ENOEXEC;
  335                 goto cleanup;
  336         }
  337 
  338         /*
  339          * While we are here, we should REALLY do some more checks
  340          */
  341 
  342         /* Set file/virtual offset based on a.out variant. */
  343         switch ((int)(a_out->a_magic & 0xffff)) {
  344         case 0413:                      /* ZMAGIC */
  345                 file_offset = 1024;
  346                 break;
  347         case 0314:                      /* QMAGIC */
  348                 file_offset = 0;
  349                 break;
  350         default:
  351                 error = ENOEXEC;
  352                 goto cleanup;
  353         }
  354 
  355         bss_size = round_page(a_out->a_bss);
  356 
  357         /* Check various fields in header for validity/bounds. */
  358         if (a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) {
  359                 error = ENOEXEC;
  360                 goto cleanup;
  361         }
  362 
  363         /* text + data can't exceed file size */
  364         if (a_out->a_data + a_out->a_text > attr.va_size) {
  365                 error = EFAULT;
  366                 goto cleanup;
  367         }
  368 
  369         /*
  370          * text/data/bss must not exceed limits
  371          * XXX - this is not complete. it should check current usage PLUS
  372          * the resources needed by this library.
  373          */
  374         PROC_LOCK(td->td_proc);
  375         if (a_out->a_text > maxtsiz ||
  376             a_out->a_data + bss_size > lim_cur(td->td_proc, RLIMIT_DATA) ||
  377             racct_set(td->td_proc, RACCT_DATA, a_out->a_data +
  378             bss_size) != 0) {
  379                 PROC_UNLOCK(td->td_proc);
  380                 error = ENOMEM;
  381                 goto cleanup;
  382         }
  383         PROC_UNLOCK(td->td_proc);
  384 
  385         /*
  386          * Prevent more writers.
  387          * XXX: Note that if any of the VM operations fail below we don't
  388          * clear this flag.
  389          */
  390         VOP_SET_TEXT(vp);
  391 
  392         /*
  393          * Lock no longer needed
  394          */
  395         locked = 0;
  396         VOP_UNLOCK(vp, 0);
  397 
  398         /*
  399          * Check if file_offset page aligned. Currently we cannot handle
  400          * misalinged file offsets, and so we read in the entire image
  401          * (what a waste).
  402          */
  403         if (file_offset & PAGE_MASK) {
  404 #ifdef DEBUG
  405                 printf("uselib: Non page aligned binary %lu\n", file_offset);
  406 #endif
  407                 /* Map text+data read/write/execute */
  408 
  409                 /* a_entry is the load address and is page aligned */
  410                 vmaddr = trunc_page(a_out->a_entry);
  411 
  412                 /* get anon user mapping, read+write+execute */
  413                 error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0,
  414                     &vmaddr, a_out->a_text + a_out->a_data, 0, VMFS_NO_SPACE,
  415                     VM_PROT_ALL, VM_PROT_ALL, 0);
  416                 if (error)
  417                         goto cleanup;
  418 
  419                 error = vn_rdwr(UIO_READ, vp, (void *)vmaddr, file_offset,
  420                     a_out->a_text + a_out->a_data, UIO_USERSPACE, 0,
  421                     td->td_ucred, NOCRED, &aresid, td);
  422                 if (error != 0)
  423                         goto cleanup;
  424                 if (aresid != 0) {
  425                         error = ENOEXEC;
  426                         goto cleanup;
  427                 }
  428         } else {
  429 #ifdef DEBUG
  430                 printf("uselib: Page aligned binary %lu\n", file_offset);
  431 #endif
  432                 /*
  433                  * for QMAGIC, a_entry is 20 bytes beyond the load address
  434                  * to skip the executable header
  435                  */
  436                 vmaddr = trunc_page(a_out->a_entry);
  437 
  438                 /*
  439                  * Map it all into the process's space as a single
  440                  * copy-on-write "data" segment.
  441                  */
  442                 error = vm_mmap(&td->td_proc->p_vmspace->vm_map, &vmaddr,
  443                     a_out->a_text + a_out->a_data, VM_PROT_ALL, VM_PROT_ALL,
  444                     MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, vp, file_offset);
  445                 if (error)
  446                         goto cleanup;
  447         }
  448 #ifdef DEBUG
  449         printf("mem=%08lx = %08lx %08lx\n", (long)vmaddr, ((long *)vmaddr)[0],
  450             ((long *)vmaddr)[1]);
  451 #endif
  452         if (bss_size != 0) {
  453                 /* Calculate BSS start address */
  454                 vmaddr = trunc_page(a_out->a_entry) + a_out->a_text +
  455                     a_out->a_data;
  456 
  457                 /* allocate some 'anon' space */
  458                 error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0,
  459                     &vmaddr, bss_size, 0, VMFS_NO_SPACE, VM_PROT_ALL,
  460                     VM_PROT_ALL, 0);
  461                 if (error)
  462                         goto cleanup;
  463         }
  464 
  465 cleanup:
  466         /* Unlock vnode if needed */
  467         if (locked)
  468                 VOP_UNLOCK(vp, 0);
  469 
  470         /* Release the temporary mapping. */
  471         if (a_out)
  472                 kmap_free_wakeup(exec_map, (vm_offset_t)a_out, PAGE_SIZE);
  473 
  474         return (error);
  475 }
  476 
  477 #endif  /* __i386__ */
  478 
  479 int
  480 linux_select(struct thread *td, struct linux_select_args *args)
  481 {
  482         l_timeval ltv;
  483         struct timeval tv0, tv1, utv, *tvp;
  484         int error;
  485 
  486 #ifdef DEBUG
  487         if (ldebug(select))
  488                 printf(ARGS(select, "%d, %p, %p, %p, %p"), args->nfds,
  489                     (void *)args->readfds, (void *)args->writefds,
  490                     (void *)args->exceptfds, (void *)args->timeout);
  491 #endif
  492 
  493         /*
  494          * Store current time for computation of the amount of
  495          * time left.
  496          */
  497         if (args->timeout) {
  498                 if ((error = copyin(args->timeout, &ltv, sizeof(ltv))))
  499                         goto select_out;
  500                 utv.tv_sec = ltv.tv_sec;
  501                 utv.tv_usec = ltv.tv_usec;
  502 #ifdef DEBUG
  503                 if (ldebug(select))
  504                         printf(LMSG("incoming timeout (%jd/%ld)"),
  505                             (intmax_t)utv.tv_sec, utv.tv_usec);
  506 #endif
  507 
  508                 if (itimerfix(&utv)) {
  509                         /*
  510                          * The timeval was invalid.  Convert it to something
  511                          * valid that will act as it does under Linux.
  512                          */
  513                         utv.tv_sec += utv.tv_usec / 1000000;
  514                         utv.tv_usec %= 1000000;
  515                         if (utv.tv_usec < 0) {
  516                                 utv.tv_sec -= 1;
  517                                 utv.tv_usec += 1000000;
  518                         }
  519                         if (utv.tv_sec < 0)
  520                                 timevalclear(&utv);
  521                 }
  522                 microtime(&tv0);
  523                 tvp = &utv;
  524         } else
  525                 tvp = NULL;
  526 
  527         error = kern_select(td, args->nfds, args->readfds, args->writefds,
  528             args->exceptfds, tvp, sizeof(l_int) * 8);
  529 
  530 #ifdef DEBUG
  531         if (ldebug(select))
  532                 printf(LMSG("real select returns %d"), error);
  533 #endif
  534         if (error)
  535                 goto select_out;
  536 
  537         if (args->timeout) {
  538                 if (td->td_retval[0]) {
  539                         /*
  540                          * Compute how much time was left of the timeout,
  541                          * by subtracting the current time and the time
  542                          * before we started the call, and subtracting
  543                          * that result from the user-supplied value.
  544                          */
  545                         microtime(&tv1);
  546                         timevalsub(&tv1, &tv0);
  547                         timevalsub(&utv, &tv1);
  548                         if (utv.tv_sec < 0)
  549                                 timevalclear(&utv);
  550                 } else
  551                         timevalclear(&utv);
  552 #ifdef DEBUG
  553                 if (ldebug(select))
  554                         printf(LMSG("outgoing timeout (%jd/%ld)"),
  555                             (intmax_t)utv.tv_sec, utv.tv_usec);
  556 #endif
  557                 ltv.tv_sec = utv.tv_sec;
  558                 ltv.tv_usec = utv.tv_usec;
  559                 if ((error = copyout(&ltv, args->timeout, sizeof(ltv))))
  560                         goto select_out;
  561         }
  562 
  563 select_out:
  564 #ifdef DEBUG
  565         if (ldebug(select))
  566                 printf(LMSG("select_out -> %d"), error);
  567 #endif
  568         return (error);
  569 }
  570 
  571 int
  572 linux_mremap(struct thread *td, struct linux_mremap_args *args)
  573 {
  574         struct munmap_args /* {
  575                 void *addr;
  576                 size_t len;
  577         } */ bsd_args;
  578         int error = 0;
  579 
  580 #ifdef DEBUG
  581         if (ldebug(mremap))
  582                 printf(ARGS(mremap, "%p, %08lx, %08lx, %08lx"),
  583                     (void *)(uintptr_t)args->addr,
  584                     (unsigned long)args->old_len,
  585                     (unsigned long)args->new_len,
  586                     (unsigned long)args->flags);
  587 #endif
  588 
  589         if (args->flags & ~(LINUX_MREMAP_FIXED | LINUX_MREMAP_MAYMOVE)) {
  590                 td->td_retval[0] = 0;
  591                 return (EINVAL);
  592         }
  593 
  594         /*
  595          * Check for the page alignment.
  596          * Linux defines PAGE_MASK to be FreeBSD ~PAGE_MASK.
  597          */
  598         if (args->addr & PAGE_MASK) {
  599                 td->td_retval[0] = 0;
  600                 return (EINVAL);
  601         }
  602 
  603         args->new_len = round_page(args->new_len);
  604         args->old_len = round_page(args->old_len);
  605 
  606         if (args->new_len > args->old_len) {
  607                 td->td_retval[0] = 0;
  608                 return (ENOMEM);
  609         }
  610 
  611         if (args->new_len < args->old_len) {
  612                 bsd_args.addr =
  613                     (caddr_t)((uintptr_t)args->addr + args->new_len);
  614                 bsd_args.len = args->old_len - args->new_len;
  615                 error = sys_munmap(td, &bsd_args);
  616         }
  617 
  618         td->td_retval[0] = error ? 0 : (uintptr_t)args->addr;
  619         return (error);
  620 }
  621 
  622 #define LINUX_MS_ASYNC       0x0001
  623 #define LINUX_MS_INVALIDATE  0x0002
  624 #define LINUX_MS_SYNC        0x0004
  625 
  626 int
  627 linux_msync(struct thread *td, struct linux_msync_args *args)
  628 {
  629         struct msync_args bsd_args;
  630 
  631         bsd_args.addr = (caddr_t)(uintptr_t)args->addr;
  632         bsd_args.len = (uintptr_t)args->len;
  633         bsd_args.flags = args->fl & ~LINUX_MS_SYNC;
  634 
  635         return (sys_msync(td, &bsd_args));
  636 }
  637 
  638 int
  639 linux_time(struct thread *td, struct linux_time_args *args)
  640 {
  641         struct timeval tv;
  642         l_time_t tm;
  643         int error;
  644 
  645 #ifdef DEBUG
  646         if (ldebug(time))
  647                 printf(ARGS(time, "*"));
  648 #endif
  649 
  650         microtime(&tv);
  651         tm = tv.tv_sec;
  652         if (args->tm && (error = copyout(&tm, args->tm, sizeof(tm))))
  653                 return (error);
  654         td->td_retval[0] = tm;
  655         return (0);
  656 }
  657 
  658 struct l_times_argv {
  659         l_clock_t       tms_utime;
  660         l_clock_t       tms_stime;
  661         l_clock_t       tms_cutime;
  662         l_clock_t       tms_cstime;
  663 };
  664 
  665 
  666 /*
  667  * Glibc versions prior to 2.2.1 always use hard-coded CLK_TCK value.
  668  * Since 2.2.1 Glibc uses value exported from kernel via AT_CLKTCK
  669  * auxiliary vector entry.
  670  */
  671 #define CLK_TCK         100
  672 
  673 #define CONVOTCK(r)     (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
  674 #define CONVNTCK(r)     (r.tv_sec * stclohz + r.tv_usec / (1000000 / stclohz))
  675 
  676 #define CONVTCK(r)      (linux_kernver(td) >= LINUX_KERNVER_2004000 ?           \
  677                             CONVNTCK(r) : CONVOTCK(r))
  678 
  679 int
  680 linux_times(struct thread *td, struct linux_times_args *args)
  681 {
  682         struct timeval tv, utime, stime, cutime, cstime;
  683         struct l_times_argv tms;
  684         struct proc *p;
  685         int error;
  686 
  687 #ifdef DEBUG
  688         if (ldebug(times))
  689                 printf(ARGS(times, "*"));
  690 #endif
  691 
  692         if (args->buf != NULL) {
  693                 p = td->td_proc;
  694                 PROC_LOCK(p);
  695                 PROC_SLOCK(p);
  696                 calcru(p, &utime, &stime);
  697                 PROC_SUNLOCK(p);
  698                 calccru(p, &cutime, &cstime);
  699                 PROC_UNLOCK(p);
  700 
  701                 tms.tms_utime = CONVTCK(utime);
  702                 tms.tms_stime = CONVTCK(stime);
  703 
  704                 tms.tms_cutime = CONVTCK(cutime);
  705                 tms.tms_cstime = CONVTCK(cstime);
  706 
  707                 if ((error = copyout(&tms, args->buf, sizeof(tms))))
  708                         return (error);
  709         }
  710 
  711         microuptime(&tv);
  712         td->td_retval[0] = (int)CONVTCK(tv);
  713         return (0);
  714 }
  715 
  716 int
  717 linux_newuname(struct thread *td, struct linux_newuname_args *args)
  718 {
  719         struct l_new_utsname utsname;
  720         char osname[LINUX_MAX_UTSNAME];
  721         char osrelease[LINUX_MAX_UTSNAME];
  722         char *p;
  723 
  724 #ifdef DEBUG
  725         if (ldebug(newuname))
  726                 printf(ARGS(newuname, "*"));
  727 #endif
  728 
  729         linux_get_osname(td, osname);
  730         linux_get_osrelease(td, osrelease);
  731 
  732         bzero(&utsname, sizeof(utsname));
  733         strlcpy(utsname.sysname, osname, LINUX_MAX_UTSNAME);
  734         getcredhostname(td->td_ucred, utsname.nodename, LINUX_MAX_UTSNAME);
  735         getcreddomainname(td->td_ucred, utsname.domainname, LINUX_MAX_UTSNAME);
  736         strlcpy(utsname.release, osrelease, LINUX_MAX_UTSNAME);
  737         strlcpy(utsname.version, version, LINUX_MAX_UTSNAME);
  738         for (p = utsname.version; *p != '\0'; ++p)
  739                 if (*p == '\n') {
  740                         *p = '\0';
  741                         break;
  742                 }
  743         strlcpy(utsname.machine, linux_platform, LINUX_MAX_UTSNAME);
  744 
  745         return (copyout(&utsname, args->buf, sizeof(utsname)));
  746 }
  747 
  748 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  749 struct l_utimbuf {
  750         l_time_t l_actime;
  751         l_time_t l_modtime;
  752 };
  753 
  754 int
  755 linux_utime(struct thread *td, struct linux_utime_args *args)
  756 {
  757         struct timeval tv[2], *tvp;
  758         struct l_utimbuf lut;
  759         char *fname;
  760         int error;
  761 
  762         LCONVPATHEXIST(td, args->fname, &fname);
  763 
  764 #ifdef DEBUG
  765         if (ldebug(utime))
  766                 printf(ARGS(utime, "%s, *"), fname);
  767 #endif
  768 
  769         if (args->times) {
  770                 if ((error = copyin(args->times, &lut, sizeof lut))) {
  771                         LFREEPATH(fname);
  772                         return (error);
  773                 }
  774                 tv[0].tv_sec = lut.l_actime;
  775                 tv[0].tv_usec = 0;
  776                 tv[1].tv_sec = lut.l_modtime;
  777                 tv[1].tv_usec = 0;
  778                 tvp = tv;
  779         } else
  780                 tvp = NULL;
  781 
  782         error = kern_utimes(td, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  783         LFREEPATH(fname);
  784         return (error);
  785 }
  786 
  787 int
  788 linux_utimes(struct thread *td, struct linux_utimes_args *args)
  789 {
  790         l_timeval ltv[2];
  791         struct timeval tv[2], *tvp = NULL;
  792         char *fname;
  793         int error;
  794 
  795         LCONVPATHEXIST(td, args->fname, &fname);
  796 
  797 #ifdef DEBUG
  798         if (ldebug(utimes))
  799                 printf(ARGS(utimes, "%s, *"), fname);
  800 #endif
  801 
  802         if (args->tptr != NULL) {
  803                 if ((error = copyin(args->tptr, ltv, sizeof ltv))) {
  804                         LFREEPATH(fname);
  805                         return (error);
  806                 }
  807                 tv[0].tv_sec = ltv[0].tv_sec;
  808                 tv[0].tv_usec = ltv[0].tv_usec;
  809                 tv[1].tv_sec = ltv[1].tv_sec;
  810                 tv[1].tv_usec = ltv[1].tv_usec;
  811                 tvp = tv;
  812         }
  813 
  814         error = kern_utimes(td, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  815         LFREEPATH(fname);
  816         return (error);
  817 }
  818 
  819 int
  820 linux_futimesat(struct thread *td, struct linux_futimesat_args *args)
  821 {
  822         l_timeval ltv[2];
  823         struct timeval tv[2], *tvp = NULL;
  824         char *fname;
  825         int error, dfd;
  826 
  827         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  828         LCONVPATHEXIST_AT(td, args->filename, &fname, dfd);
  829 
  830 #ifdef DEBUG
  831         if (ldebug(futimesat))
  832                 printf(ARGS(futimesat, "%s, *"), fname);
  833 #endif
  834 
  835         if (args->utimes != NULL) {
  836                 if ((error = copyin(args->utimes, ltv, sizeof ltv))) {
  837                         LFREEPATH(fname);
  838                         return (error);
  839                 }
  840                 tv[0].tv_sec = ltv[0].tv_sec;
  841                 tv[0].tv_usec = ltv[0].tv_usec;
  842                 tv[1].tv_sec = ltv[1].tv_sec;
  843                 tv[1].tv_usec = ltv[1].tv_usec;
  844                 tvp = tv;
  845         }
  846 
  847         error = kern_utimesat(td, dfd, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  848         LFREEPATH(fname);
  849         return (error);
  850 }
  851 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
  852 
  853 int
  854 linux_common_wait(struct thread *td, int pid, int *status,
  855     int options, struct rusage *ru)
  856 {
  857         int error, tmpstat;
  858 
  859         error = kern_wait(td, pid, &tmpstat, options, ru);
  860         if (error)
  861                 return (error);
  862 
  863         if (status) {
  864                 tmpstat &= 0xffff;
  865                 if (WIFSIGNALED(tmpstat))
  866                         tmpstat = (tmpstat & 0xffffff80) |
  867                             BSD_TO_LINUX_SIGNAL(WTERMSIG(tmpstat));
  868                 else if (WIFSTOPPED(tmpstat))
  869                         tmpstat = (tmpstat & 0xffff00ff) |
  870                             (BSD_TO_LINUX_SIGNAL(WSTOPSIG(tmpstat)) << 8);
  871                 error = copyout(&tmpstat, status, sizeof(int));
  872         }
  873 
  874         return (error);
  875 }
  876 
  877 int
  878 linux_waitpid(struct thread *td, struct linux_waitpid_args *args)
  879 {
  880         int options;
  881  
  882 #ifdef DEBUG
  883         if (ldebug(waitpid))
  884                 printf(ARGS(waitpid, "%d, %p, %d"),
  885                     args->pid, (void *)args->status, args->options);
  886 #endif
  887         /*
  888          * this is necessary because the test in kern_wait doesn't work
  889          * because we mess with the options here
  890          */
  891         if (args->options & ~(WUNTRACED | WNOHANG | WCONTINUED | __WCLONE))
  892                 return (EINVAL);
  893    
  894         options = (args->options & (WNOHANG | WUNTRACED));
  895         /* WLINUXCLONE should be equal to __WCLONE, but we make sure */
  896         if (args->options & __WCLONE)
  897                 options |= WLINUXCLONE;
  898 
  899         return (linux_common_wait(td, args->pid, args->status, options, NULL));
  900 }
  901 
  902 
  903 int
  904 linux_mknod(struct thread *td, struct linux_mknod_args *args)
  905 {
  906         char *path;
  907         int error;
  908 
  909         LCONVPATHCREAT(td, args->path, &path);
  910 
  911 #ifdef DEBUG
  912         if (ldebug(mknod))
  913                 printf(ARGS(mknod, "%s, %d, %d"), path, args->mode, args->dev);
  914 #endif
  915 
  916         switch (args->mode & S_IFMT) {
  917         case S_IFIFO:
  918         case S_IFSOCK:
  919                 error = kern_mkfifo(td, path, UIO_SYSSPACE, args->mode);
  920                 break;
  921 
  922         case S_IFCHR:
  923         case S_IFBLK:
  924                 error = kern_mknod(td, path, UIO_SYSSPACE, args->mode,
  925                     args->dev);
  926                 break;
  927 
  928         case S_IFDIR:
  929                 error = EPERM;
  930                 break;
  931 
  932         case 0:
  933                 args->mode |= S_IFREG;
  934                 /* FALLTHROUGH */
  935         case S_IFREG:
  936                 error = kern_open(td, path, UIO_SYSSPACE,
  937                     O_WRONLY | O_CREAT | O_TRUNC, args->mode);
  938                 if (error == 0)
  939                         kern_close(td, td->td_retval[0]);
  940                 break;
  941 
  942         default:
  943                 error = EINVAL;
  944                 break;
  945         }
  946         LFREEPATH(path);
  947         return (error);
  948 }
  949 
  950 int
  951 linux_mknodat(struct thread *td, struct linux_mknodat_args *args)
  952 {
  953         char *path;
  954         int error, dfd;
  955 
  956         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  957         LCONVPATHCREAT_AT(td, args->filename, &path, dfd);
  958 
  959 #ifdef DEBUG
  960         if (ldebug(mknodat))
  961                 printf(ARGS(mknodat, "%s, %d, %d"), path, args->mode, args->dev);
  962 #endif
  963 
  964         switch (args->mode & S_IFMT) {
  965         case S_IFIFO:
  966         case S_IFSOCK:
  967                 error = kern_mkfifoat(td, dfd, path, UIO_SYSSPACE, args->mode);
  968                 break;
  969 
  970         case S_IFCHR:
  971         case S_IFBLK:
  972                 error = kern_mknodat(td, dfd, path, UIO_SYSSPACE, args->mode,
  973                     args->dev);
  974                 break;
  975 
  976         case S_IFDIR:
  977                 error = EPERM;
  978                 break;
  979 
  980         case 0:
  981                 args->mode |= S_IFREG;
  982                 /* FALLTHROUGH */
  983         case S_IFREG:
  984                 error = kern_openat(td, dfd, path, UIO_SYSSPACE,
  985                     O_WRONLY | O_CREAT | O_TRUNC, args->mode);
  986                 if (error == 0)
  987                         kern_close(td, td->td_retval[0]);
  988                 break;
  989 
  990         default:
  991                 error = EINVAL;
  992                 break;
  993         }
  994         LFREEPATH(path);
  995         return (error);
  996 }
  997 
  998 /*
  999  * UGH! This is just about the dumbest idea I've ever heard!!
 1000  */
 1001 int
 1002 linux_personality(struct thread *td, struct linux_personality_args *args)
 1003 {
 1004 #ifdef DEBUG
 1005         if (ldebug(personality))
 1006                 printf(ARGS(personality, "%lu"), (unsigned long)args->per);
 1007 #endif
 1008         if (args->per != 0)
 1009                 return (EINVAL);
 1010 
 1011         /* Yes Jim, it's still a Linux... */
 1012         td->td_retval[0] = 0;
 1013         return (0);
 1014 }
 1015 
 1016 struct l_itimerval {
 1017         l_timeval it_interval;
 1018         l_timeval it_value;
 1019 };
 1020 
 1021 #define B2L_ITIMERVAL(bip, lip)                                         \
 1022         (bip)->it_interval.tv_sec = (lip)->it_interval.tv_sec;          \
 1023         (bip)->it_interval.tv_usec = (lip)->it_interval.tv_usec;        \
 1024         (bip)->it_value.tv_sec = (lip)->it_value.tv_sec;                \
 1025         (bip)->it_value.tv_usec = (lip)->it_value.tv_usec;
 1026 
 1027 int
 1028 linux_setitimer(struct thread *td, struct linux_setitimer_args *uap)
 1029 {
 1030         int error;
 1031         struct l_itimerval ls;
 1032         struct itimerval aitv, oitv;
 1033 
 1034 #ifdef DEBUG
 1035         if (ldebug(setitimer))
 1036                 printf(ARGS(setitimer, "%p, %p"),
 1037                     (void *)uap->itv, (void *)uap->oitv);
 1038 #endif
 1039 
 1040         if (uap->itv == NULL) {
 1041                 uap->itv = uap->oitv;
 1042                 return (linux_getitimer(td, (struct linux_getitimer_args *)uap));
 1043         }
 1044 
 1045         error = copyin(uap->itv, &ls, sizeof(ls));
 1046         if (error != 0)
 1047                 return (error);
 1048         B2L_ITIMERVAL(&aitv, &ls);
 1049 #ifdef DEBUG
 1050         if (ldebug(setitimer)) {
 1051                 printf("setitimer: value: sec: %jd, usec: %ld\n",
 1052                     (intmax_t)aitv.it_value.tv_sec, aitv.it_value.tv_usec);
 1053                 printf("setitimer: interval: sec: %jd, usec: %ld\n",
 1054                     (intmax_t)aitv.it_interval.tv_sec, aitv.it_interval.tv_usec);
 1055         }
 1056 #endif
 1057         error = kern_setitimer(td, uap->which, &aitv, &oitv);
 1058         if (error != 0 || uap->oitv == NULL)
 1059                 return (error);
 1060         B2L_ITIMERVAL(&ls, &oitv);
 1061 
 1062         return (copyout(&ls, uap->oitv, sizeof(ls)));
 1063 }
 1064 
 1065 int
 1066 linux_getitimer(struct thread *td, struct linux_getitimer_args *uap)
 1067 {
 1068         int error;
 1069         struct l_itimerval ls;
 1070         struct itimerval aitv;
 1071 
 1072 #ifdef DEBUG
 1073         if (ldebug(getitimer))
 1074                 printf(ARGS(getitimer, "%p"), (void *)uap->itv);
 1075 #endif
 1076         error = kern_getitimer(td, uap->which, &aitv);
 1077         if (error != 0)
 1078                 return (error);
 1079         B2L_ITIMERVAL(&ls, &aitv);
 1080         return (copyout(&ls, uap->itv, sizeof(ls)));
 1081 }
 1082 
 1083 int
 1084 linux_nice(struct thread *td, struct linux_nice_args *args)
 1085 {
 1086         struct setpriority_args bsd_args;
 1087 
 1088         bsd_args.which = PRIO_PROCESS;
 1089         bsd_args.who = 0;               /* current process */
 1090         bsd_args.prio = args->inc;
 1091         return (sys_setpriority(td, &bsd_args));
 1092 }
 1093 
 1094 int
 1095 linux_setgroups(struct thread *td, struct linux_setgroups_args *args)
 1096 {
 1097         struct ucred *newcred, *oldcred;
 1098         l_gid_t *linux_gidset;
 1099         gid_t *bsd_gidset;
 1100         int ngrp, error;
 1101         struct proc *p;
 1102 
 1103         ngrp = args->gidsetsize;
 1104         if (ngrp < 0 || ngrp >= ngroups_max + 1)
 1105                 return (EINVAL);
 1106         linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_TEMP, M_WAITOK);
 1107         error = copyin(args->grouplist, linux_gidset, ngrp * sizeof(l_gid_t));
 1108         if (error)
 1109                 goto out;
 1110         newcred = crget();
 1111         crextend(newcred, ngrp + 1);
 1112         p = td->td_proc;
 1113         PROC_LOCK(p);
 1114         oldcred = p->p_ucred;
 1115         crcopy(newcred, oldcred);
 1116 
 1117         /*
 1118          * cr_groups[0] holds egid. Setting the whole set from
 1119          * the supplied set will cause egid to be changed too.
 1120          * Keep cr_groups[0] unchanged to prevent that.
 1121          */
 1122 
 1123         if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) {
 1124                 PROC_UNLOCK(p);
 1125                 crfree(newcred);
 1126                 goto out;
 1127         }
 1128 
 1129         if (ngrp > 0) {
 1130                 newcred->cr_ngroups = ngrp + 1;
 1131 
 1132                 bsd_gidset = newcred->cr_groups;
 1133                 ngrp--;
 1134                 while (ngrp >= 0) {
 1135                         bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
 1136                         ngrp--;
 1137                 }
 1138         } else
 1139                 newcred->cr_ngroups = 1;
 1140 
 1141         setsugid(p);
 1142         p->p_ucred = newcred;
 1143         PROC_UNLOCK(p);
 1144         crfree(oldcred);
 1145         error = 0;
 1146 out:
 1147         free(linux_gidset, M_TEMP);
 1148         return (error);
 1149 }
 1150 
 1151 int
 1152 linux_getgroups(struct thread *td, struct linux_getgroups_args *args)
 1153 {
 1154         struct ucred *cred;
 1155         l_gid_t *linux_gidset;
 1156         gid_t *bsd_gidset;
 1157         int bsd_gidsetsz, ngrp, error;
 1158 
 1159         cred = td->td_ucred;
 1160         bsd_gidset = cred->cr_groups;
 1161         bsd_gidsetsz = cred->cr_ngroups - 1;
 1162 
 1163         /*
 1164          * cr_groups[0] holds egid. Returning the whole set
 1165          * here will cause a duplicate. Exclude cr_groups[0]
 1166          * to prevent that.
 1167          */
 1168 
 1169         if ((ngrp = args->gidsetsize) == 0) {
 1170                 td->td_retval[0] = bsd_gidsetsz;
 1171                 return (0);
 1172         }
 1173 
 1174         if (ngrp < bsd_gidsetsz)
 1175                 return (EINVAL);
 1176 
 1177         ngrp = 0;
 1178         linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset),
 1179             M_TEMP, M_WAITOK);
 1180         while (ngrp < bsd_gidsetsz) {
 1181                 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
 1182                 ngrp++;
 1183         }
 1184 
 1185         error = copyout(linux_gidset, args->grouplist, ngrp * sizeof(l_gid_t));
 1186         free(linux_gidset, M_TEMP);
 1187         if (error)
 1188                 return (error);
 1189 
 1190         td->td_retval[0] = ngrp;
 1191         return (0);
 1192 }
 1193 
 1194 int
 1195 linux_setrlimit(struct thread *td, struct linux_setrlimit_args *args)
 1196 {
 1197         struct rlimit bsd_rlim;
 1198         struct l_rlimit rlim;
 1199         u_int which;
 1200         int error;
 1201 
 1202 #ifdef DEBUG
 1203         if (ldebug(setrlimit))
 1204                 printf(ARGS(setrlimit, "%d, %p"),
 1205                     args->resource, (void *)args->rlim);
 1206 #endif
 1207 
 1208         if (args->resource >= LINUX_RLIM_NLIMITS)
 1209                 return (EINVAL);
 1210 
 1211         which = linux_to_bsd_resource[args->resource];
 1212         if (which == -1)
 1213                 return (EINVAL);
 1214 
 1215         error = copyin(args->rlim, &rlim, sizeof(rlim));
 1216         if (error)
 1217                 return (error);
 1218 
 1219         bsd_rlim.rlim_cur = (rlim_t)rlim.rlim_cur;
 1220         bsd_rlim.rlim_max = (rlim_t)rlim.rlim_max;
 1221         return (kern_setrlimit(td, which, &bsd_rlim));
 1222 }
 1223 
 1224 int
 1225 linux_old_getrlimit(struct thread *td, struct linux_old_getrlimit_args *args)
 1226 {
 1227         struct l_rlimit rlim;
 1228         struct proc *p = td->td_proc;
 1229         struct rlimit bsd_rlim;
 1230         u_int which;
 1231 
 1232 #ifdef DEBUG
 1233         if (ldebug(old_getrlimit))
 1234                 printf(ARGS(old_getrlimit, "%d, %p"),
 1235                     args->resource, (void *)args->rlim);
 1236 #endif
 1237 
 1238         if (args->resource >= LINUX_RLIM_NLIMITS)
 1239                 return (EINVAL);
 1240 
 1241         which = linux_to_bsd_resource[args->resource];
 1242         if (which == -1)
 1243                 return (EINVAL);
 1244 
 1245         PROC_LOCK(p);
 1246         lim_rlimit(p, which, &bsd_rlim);
 1247         PROC_UNLOCK(p);
 1248 
 1249 #ifdef COMPAT_LINUX32
 1250         rlim.rlim_cur = (unsigned int)bsd_rlim.rlim_cur;
 1251         if (rlim.rlim_cur == UINT_MAX)
 1252                 rlim.rlim_cur = INT_MAX;
 1253         rlim.rlim_max = (unsigned int)bsd_rlim.rlim_max;
 1254         if (rlim.rlim_max == UINT_MAX)
 1255                 rlim.rlim_max = INT_MAX;
 1256 #else
 1257         rlim.rlim_cur = (unsigned long)bsd_rlim.rlim_cur;
 1258         if (rlim.rlim_cur == ULONG_MAX)
 1259                 rlim.rlim_cur = LONG_MAX;
 1260         rlim.rlim_max = (unsigned long)bsd_rlim.rlim_max;
 1261         if (rlim.rlim_max == ULONG_MAX)
 1262                 rlim.rlim_max = LONG_MAX;
 1263 #endif
 1264         return (copyout(&rlim, args->rlim, sizeof(rlim)));
 1265 }
 1266 
 1267 int
 1268 linux_getrlimit(struct thread *td, struct linux_getrlimit_args *args)
 1269 {
 1270         struct l_rlimit rlim;
 1271         struct proc *p = td->td_proc;
 1272         struct rlimit bsd_rlim;
 1273         u_int which;
 1274 
 1275 #ifdef DEBUG
 1276         if (ldebug(getrlimit))
 1277                 printf(ARGS(getrlimit, "%d, %p"),
 1278                     args->resource, (void *)args->rlim);
 1279 #endif
 1280 
 1281         if (args->resource >= LINUX_RLIM_NLIMITS)
 1282                 return (EINVAL);
 1283 
 1284         which = linux_to_bsd_resource[args->resource];
 1285         if (which == -1)
 1286                 return (EINVAL);
 1287 
 1288         PROC_LOCK(p);
 1289         lim_rlimit(p, which, &bsd_rlim);
 1290         PROC_UNLOCK(p);
 1291 
 1292         rlim.rlim_cur = (l_ulong)bsd_rlim.rlim_cur;
 1293         rlim.rlim_max = (l_ulong)bsd_rlim.rlim_max;
 1294         return (copyout(&rlim, args->rlim, sizeof(rlim)));
 1295 }
 1296 
 1297 int
 1298 linux_sched_setscheduler(struct thread *td,
 1299     struct linux_sched_setscheduler_args *args)
 1300 {
 1301         struct sched_setscheduler_args bsd;
 1302 
 1303 #ifdef DEBUG
 1304         if (ldebug(sched_setscheduler))
 1305                 printf(ARGS(sched_setscheduler, "%d, %d, %p"),
 1306                     args->pid, args->policy, (const void *)args->param);
 1307 #endif
 1308 
 1309         switch (args->policy) {
 1310         case LINUX_SCHED_OTHER:
 1311                 bsd.policy = SCHED_OTHER;
 1312                 break;
 1313         case LINUX_SCHED_FIFO:
 1314                 bsd.policy = SCHED_FIFO;
 1315                 break;
 1316         case LINUX_SCHED_RR:
 1317                 bsd.policy = SCHED_RR;
 1318                 break;
 1319         default:
 1320                 return (EINVAL);
 1321         }
 1322 
 1323         bsd.pid = args->pid;
 1324         bsd.param = (struct sched_param *)args->param;
 1325         return (sys_sched_setscheduler(td, &bsd));
 1326 }
 1327 
 1328 int
 1329 linux_sched_getscheduler(struct thread *td,
 1330     struct linux_sched_getscheduler_args *args)
 1331 {
 1332         struct sched_getscheduler_args bsd;
 1333         int error;
 1334 
 1335 #ifdef DEBUG
 1336         if (ldebug(sched_getscheduler))
 1337                 printf(ARGS(sched_getscheduler, "%d"), args->pid);
 1338 #endif
 1339 
 1340         bsd.pid = args->pid;
 1341         error = sys_sched_getscheduler(td, &bsd);
 1342 
 1343         switch (td->td_retval[0]) {
 1344         case SCHED_OTHER:
 1345                 td->td_retval[0] = LINUX_SCHED_OTHER;
 1346                 break;
 1347         case SCHED_FIFO:
 1348                 td->td_retval[0] = LINUX_SCHED_FIFO;
 1349                 break;
 1350         case SCHED_RR:
 1351                 td->td_retval[0] = LINUX_SCHED_RR;
 1352                 break;
 1353         }
 1354 
 1355         return (error);
 1356 }
 1357 
 1358 int
 1359 linux_sched_get_priority_max(struct thread *td,
 1360     struct linux_sched_get_priority_max_args *args)
 1361 {
 1362         struct sched_get_priority_max_args bsd;
 1363 
 1364 #ifdef DEBUG
 1365         if (ldebug(sched_get_priority_max))
 1366                 printf(ARGS(sched_get_priority_max, "%d"), args->policy);
 1367 #endif
 1368 
 1369         switch (args->policy) {
 1370         case LINUX_SCHED_OTHER:
 1371                 bsd.policy = SCHED_OTHER;
 1372                 break;
 1373         case LINUX_SCHED_FIFO:
 1374                 bsd.policy = SCHED_FIFO;
 1375                 break;
 1376         case LINUX_SCHED_RR:
 1377                 bsd.policy = SCHED_RR;
 1378                 break;
 1379         default:
 1380                 return (EINVAL);
 1381         }
 1382         return (sys_sched_get_priority_max(td, &bsd));
 1383 }
 1384 
 1385 int
 1386 linux_sched_get_priority_min(struct thread *td,
 1387     struct linux_sched_get_priority_min_args *args)
 1388 {
 1389         struct sched_get_priority_min_args bsd;
 1390 
 1391 #ifdef DEBUG
 1392         if (ldebug(sched_get_priority_min))
 1393                 printf(ARGS(sched_get_priority_min, "%d"), args->policy);
 1394 #endif
 1395 
 1396         switch (args->policy) {
 1397         case LINUX_SCHED_OTHER:
 1398                 bsd.policy = SCHED_OTHER;
 1399                 break;
 1400         case LINUX_SCHED_FIFO:
 1401                 bsd.policy = SCHED_FIFO;
 1402                 break;
 1403         case LINUX_SCHED_RR:
 1404                 bsd.policy = SCHED_RR;
 1405                 break;
 1406         default:
 1407                 return (EINVAL);
 1408         }
 1409         return (sys_sched_get_priority_min(td, &bsd));
 1410 }
 1411 
 1412 #define REBOOT_CAD_ON   0x89abcdef
 1413 #define REBOOT_CAD_OFF  0
 1414 #define REBOOT_HALT     0xcdef0123
 1415 #define REBOOT_RESTART  0x01234567
 1416 #define REBOOT_RESTART2 0xA1B2C3D4
 1417 #define REBOOT_POWEROFF 0x4321FEDC
 1418 #define REBOOT_MAGIC1   0xfee1dead
 1419 #define REBOOT_MAGIC2   0x28121969
 1420 #define REBOOT_MAGIC2A  0x05121996
 1421 #define REBOOT_MAGIC2B  0x16041998
 1422 
 1423 int
 1424 linux_reboot(struct thread *td, struct linux_reboot_args *args)
 1425 {
 1426         struct reboot_args bsd_args;
 1427 
 1428 #ifdef DEBUG
 1429         if (ldebug(reboot))
 1430                 printf(ARGS(reboot, "0x%x"), args->cmd);
 1431 #endif
 1432 
 1433         if (args->magic1 != REBOOT_MAGIC1)
 1434                 return (EINVAL);
 1435 
 1436         switch (args->magic2) {
 1437         case REBOOT_MAGIC2:
 1438         case REBOOT_MAGIC2A:
 1439         case REBOOT_MAGIC2B:
 1440                 break;
 1441         default:
 1442                 return (EINVAL);
 1443         }
 1444 
 1445         switch (args->cmd) {
 1446         case REBOOT_CAD_ON:
 1447         case REBOOT_CAD_OFF:
 1448                 return (priv_check(td, PRIV_REBOOT));
 1449         case REBOOT_HALT:
 1450                 bsd_args.opt = RB_HALT;
 1451                 break;
 1452         case REBOOT_RESTART:
 1453         case REBOOT_RESTART2:
 1454                 bsd_args.opt = 0;
 1455                 break;
 1456         case REBOOT_POWEROFF:
 1457                 bsd_args.opt = RB_POWEROFF;
 1458                 break;
 1459         default:
 1460                 return (EINVAL);
 1461         }
 1462         return (sys_reboot(td, &bsd_args));
 1463 }
 1464 
 1465 
 1466 /*
 1467  * The FreeBSD native getpid(2), getgid(2) and getuid(2) also modify
 1468  * td->td_retval[1] when COMPAT_43 is defined. This clobbers registers that
 1469  * are assumed to be preserved. The following lightweight syscalls fixes
 1470  * this. See also linux_getgid16() and linux_getuid16() in linux_uid16.c
 1471  *
 1472  * linux_getpid() - MP SAFE
 1473  * linux_getgid() - MP SAFE
 1474  * linux_getuid() - MP SAFE
 1475  */
 1476 
 1477 int
 1478 linux_getpid(struct thread *td, struct linux_getpid_args *args)
 1479 {
 1480         struct linux_emuldata *em;
 1481 
 1482 #ifdef DEBUG
 1483         if (ldebug(getpid))
 1484                 printf(ARGS(getpid, ""));
 1485 #endif
 1486 
 1487         if (linux_use26(td)) {
 1488                 em = em_find(td->td_proc, EMUL_DONTLOCK);
 1489                 KASSERT(em != NULL, ("getpid: emuldata not found.\n"));
 1490                 td->td_retval[0] = em->shared->group_pid;
 1491         } else {
 1492                 td->td_retval[0] = td->td_proc->p_pid;
 1493         }
 1494 
 1495         return (0);
 1496 }
 1497 
 1498 int
 1499 linux_gettid(struct thread *td, struct linux_gettid_args *args)
 1500 {
 1501 
 1502 #ifdef DEBUG
 1503         if (ldebug(gettid))
 1504                 printf(ARGS(gettid, ""));
 1505 #endif
 1506 
 1507         td->td_retval[0] = td->td_proc->p_pid;
 1508         return (0);
 1509 }
 1510 
 1511 
 1512 int
 1513 linux_getppid(struct thread *td, struct linux_getppid_args *args)
 1514 {
 1515         struct linux_emuldata *em;
 1516         struct proc *p, *pp;
 1517 
 1518 #ifdef DEBUG
 1519         if (ldebug(getppid))
 1520                 printf(ARGS(getppid, ""));
 1521 #endif
 1522 
 1523         if (!linux_use26(td)) {
 1524                 PROC_LOCK(td->td_proc);
 1525                 td->td_retval[0] = td->td_proc->p_pptr->p_pid;
 1526                 PROC_UNLOCK(td->td_proc);
 1527                 return (0);
 1528         }
 1529 
 1530         em = em_find(td->td_proc, EMUL_DONTLOCK);
 1531 
 1532         KASSERT(em != NULL, ("getppid: process emuldata not found.\n"));
 1533 
 1534         /* find the group leader */
 1535         p = pfind(em->shared->group_pid);
 1536 
 1537         if (p == NULL) {
 1538 #ifdef DEBUG
 1539                 printf(LMSG("parent process not found.\n"));
 1540 #endif
 1541                 return (0);
 1542         }
 1543 
 1544         pp = p->p_pptr;         /* switch to parent */
 1545         PROC_LOCK(pp);
 1546         PROC_UNLOCK(p);
 1547 
 1548         /* if its also linux process */
 1549         if (pp->p_sysent == &elf_linux_sysvec) {
 1550                 em = em_find(pp, EMUL_DONTLOCK);
 1551                 KASSERT(em != NULL, ("getppid: parent emuldata not found.\n"));
 1552 
 1553                 td->td_retval[0] = em->shared->group_pid;
 1554         } else
 1555                 td->td_retval[0] = pp->p_pid;
 1556 
 1557         PROC_UNLOCK(pp);
 1558 
 1559         return (0);
 1560 }
 1561 
 1562 int
 1563 linux_getgid(struct thread *td, struct linux_getgid_args *args)
 1564 {
 1565 
 1566 #ifdef DEBUG
 1567         if (ldebug(getgid))
 1568                 printf(ARGS(getgid, ""));
 1569 #endif
 1570 
 1571         td->td_retval[0] = td->td_ucred->cr_rgid;
 1572         return (0);
 1573 }
 1574 
 1575 int
 1576 linux_getuid(struct thread *td, struct linux_getuid_args *args)
 1577 {
 1578 
 1579 #ifdef DEBUG
 1580         if (ldebug(getuid))
 1581                 printf(ARGS(getuid, ""));
 1582 #endif
 1583 
 1584         td->td_retval[0] = td->td_ucred->cr_ruid;
 1585         return (0);
 1586 }
 1587 
 1588 
 1589 int
 1590 linux_getsid(struct thread *td, struct linux_getsid_args *args)
 1591 {
 1592         struct getsid_args bsd;
 1593 
 1594 #ifdef DEBUG
 1595         if (ldebug(getsid))
 1596                 printf(ARGS(getsid, "%i"), args->pid);
 1597 #endif
 1598 
 1599         bsd.pid = args->pid;
 1600         return (sys_getsid(td, &bsd));
 1601 }
 1602 
 1603 int
 1604 linux_nosys(struct thread *td, struct nosys_args *ignore)
 1605 {
 1606 
 1607         return (ENOSYS);
 1608 }
 1609 
 1610 int
 1611 linux_getpriority(struct thread *td, struct linux_getpriority_args *args)
 1612 {
 1613         struct getpriority_args bsd_args;
 1614         int error;
 1615 
 1616 #ifdef DEBUG
 1617         if (ldebug(getpriority))
 1618                 printf(ARGS(getpriority, "%i, %i"), args->which, args->who);
 1619 #endif
 1620 
 1621         bsd_args.which = args->which;
 1622         bsd_args.who = args->who;
 1623         error = sys_getpriority(td, &bsd_args);
 1624         td->td_retval[0] = 20 - td->td_retval[0];
 1625         return (error);
 1626 }
 1627 
 1628 int
 1629 linux_sethostname(struct thread *td, struct linux_sethostname_args *args)
 1630 {
 1631         int name[2];
 1632 
 1633 #ifdef DEBUG
 1634         if (ldebug(sethostname))
 1635                 printf(ARGS(sethostname, "*, %i"), args->len);
 1636 #endif
 1637 
 1638         name[0] = CTL_KERN;
 1639         name[1] = KERN_HOSTNAME;
 1640         return (userland_sysctl(td, name, 2, 0, 0, 0, args->hostname,
 1641             args->len, 0, 0));
 1642 }
 1643 
 1644 int
 1645 linux_setdomainname(struct thread *td, struct linux_setdomainname_args *args)
 1646 {
 1647         int name[2];
 1648 
 1649 #ifdef DEBUG
 1650         if (ldebug(setdomainname))
 1651                 printf(ARGS(setdomainname, "*, %i"), args->len);
 1652 #endif
 1653 
 1654         name[0] = CTL_KERN;
 1655         name[1] = KERN_NISDOMAINNAME;
 1656         return (userland_sysctl(td, name, 2, 0, 0, 0, args->name,
 1657             args->len, 0, 0));
 1658 }
 1659 
 1660 int
 1661 linux_exit_group(struct thread *td, struct linux_exit_group_args *args)
 1662 {
 1663         struct linux_emuldata *em;
 1664 
 1665 #ifdef DEBUG
 1666         if (ldebug(exit_group))
 1667                 printf(ARGS(exit_group, "%i"), args->error_code);
 1668 #endif
 1669 
 1670         em = em_find(td->td_proc, EMUL_DONTLOCK);
 1671         if (em->shared->refs > 1) {
 1672                 EMUL_SHARED_WLOCK(&emul_shared_lock);
 1673                 em->shared->flags |= EMUL_SHARED_HASXSTAT;
 1674                 em->shared->xstat = W_EXITCODE(args->error_code, 0);
 1675                 EMUL_SHARED_WUNLOCK(&emul_shared_lock);
 1676                 if (linux_use26(td))
 1677                         linux_kill_threads(td, SIGKILL);
 1678         }
 1679 
 1680         /*
 1681          * XXX: we should send a signal to the parent if
 1682          * SIGNAL_EXIT_GROUP is set. We ignore that (temporarily?)
 1683          * as it doesnt occur often.
 1684          */
 1685         exit1(td, W_EXITCODE(args->error_code, 0));
 1686 
 1687         return (0);
 1688 }
 1689 
 1690 #define _LINUX_CAPABILITY_VERSION  0x19980330
 1691 
 1692 struct l_user_cap_header {
 1693         l_int   version;
 1694         l_int   pid;
 1695 };
 1696 
 1697 struct l_user_cap_data {
 1698         l_int   effective;
 1699         l_int   permitted;
 1700         l_int   inheritable;
 1701 };
 1702 
 1703 int
 1704 linux_capget(struct thread *td, struct linux_capget_args *args)
 1705 {
 1706         struct l_user_cap_header luch;
 1707         struct l_user_cap_data lucd;
 1708         int error;
 1709 
 1710         if (args->hdrp == NULL)
 1711                 return (EFAULT);
 1712 
 1713         error = copyin(args->hdrp, &luch, sizeof(luch));
 1714         if (error != 0)
 1715                 return (error);
 1716 
 1717         if (luch.version != _LINUX_CAPABILITY_VERSION) {
 1718                 luch.version = _LINUX_CAPABILITY_VERSION;
 1719                 error = copyout(&luch, args->hdrp, sizeof(luch));
 1720                 if (error)
 1721                         return (error);
 1722                 return (EINVAL);
 1723         }
 1724 
 1725         if (luch.pid)
 1726                 return (EPERM);
 1727 
 1728         if (args->datap) {
 1729                 /*
 1730                  * The current implementation doesn't support setting
 1731                  * a capability (it's essentially a stub) so indicate
 1732                  * that no capabilities are currently set or available
 1733                  * to request.
 1734                  */
 1735                 bzero (&lucd, sizeof(lucd));
 1736                 error = copyout(&lucd, args->datap, sizeof(lucd));
 1737         }
 1738 
 1739         return (error);
 1740 }
 1741 
 1742 int
 1743 linux_capset(struct thread *td, struct linux_capset_args *args)
 1744 {
 1745         struct l_user_cap_header luch;
 1746         struct l_user_cap_data lucd;
 1747         int error;
 1748 
 1749         if (args->hdrp == NULL || args->datap == NULL)
 1750                 return (EFAULT);
 1751 
 1752         error = copyin(args->hdrp, &luch, sizeof(luch));
 1753         if (error != 0)
 1754                 return (error);
 1755 
 1756         if (luch.version != _LINUX_CAPABILITY_VERSION) {
 1757                 luch.version = _LINUX_CAPABILITY_VERSION;
 1758                 error = copyout(&luch, args->hdrp, sizeof(luch));
 1759                 if (error)
 1760                         return (error);
 1761                 return (EINVAL);
 1762         }
 1763 
 1764         if (luch.pid)
 1765                 return (EPERM);
 1766 
 1767         error = copyin(args->datap, &lucd, sizeof(lucd));
 1768         if (error != 0)
 1769                 return (error);
 1770 
 1771         /* We currently don't support setting any capabilities. */
 1772         if (lucd.effective || lucd.permitted || lucd.inheritable) {
 1773                 linux_msg(td,
 1774                           "capset effective=0x%x, permitted=0x%x, "
 1775                           "inheritable=0x%x is not implemented",
 1776                           (int)lucd.effective, (int)lucd.permitted,
 1777                           (int)lucd.inheritable);
 1778                 return (EPERM);
 1779         }
 1780 
 1781         return (0);
 1782 }
 1783 
 1784 int
 1785 linux_prctl(struct thread *td, struct linux_prctl_args *args)
 1786 {
 1787         int error = 0, max_size;
 1788         struct proc *p = td->td_proc;
 1789         char comm[LINUX_MAX_COMM_LEN];
 1790         struct linux_emuldata *em;
 1791         int pdeath_signal;
 1792 
 1793 #ifdef DEBUG
 1794         if (ldebug(prctl))
 1795                 printf(ARGS(prctl, "%d, %d, %d, %d, %d"), args->option,
 1796                     args->arg2, args->arg3, args->arg4, args->arg5);
 1797 #endif
 1798 
 1799         switch (args->option) {
 1800         case LINUX_PR_SET_PDEATHSIG:
 1801                 if (!LINUX_SIG_VALID(args->arg2))
 1802                         return (EINVAL);
 1803                 em = em_find(p, EMUL_DOLOCK);
 1804                 KASSERT(em != NULL, ("prctl: emuldata not found.\n"));
 1805                 em->pdeath_signal = args->arg2;
 1806                 EMUL_UNLOCK(&emul_lock);
 1807                 break;
 1808         case LINUX_PR_GET_PDEATHSIG:
 1809                 em = em_find(p, EMUL_DOLOCK);
 1810                 KASSERT(em != NULL, ("prctl: emuldata not found.\n"));
 1811                 pdeath_signal = em->pdeath_signal;
 1812                 EMUL_UNLOCK(&emul_lock);
 1813                 error = copyout(&pdeath_signal,
 1814                     (void *)(register_t)args->arg2,
 1815                     sizeof(pdeath_signal));
 1816                 break;
 1817         case LINUX_PR_GET_KEEPCAPS:
 1818                 /*
 1819                  * Indicate that we always clear the effective and
 1820                  * permitted capability sets when the user id becomes
 1821                  * non-zero (actually the capability sets are simply
 1822                  * always zero in the current implementation).
 1823                  */
 1824                 td->td_retval[0] = 0;
 1825                 break;
 1826         case LINUX_PR_SET_KEEPCAPS:
 1827                 /*
 1828                  * Ignore requests to keep the effective and permitted
 1829                  * capability sets when the user id becomes non-zero.
 1830                  */
 1831                 break;
 1832         case LINUX_PR_SET_NAME:
 1833                 /*
 1834                  * To be on the safe side we need to make sure to not
 1835                  * overflow the size a linux program expects. We already
 1836                  * do this here in the copyin, so that we don't need to
 1837                  * check on copyout.
 1838                  */
 1839                 max_size = MIN(sizeof(comm), sizeof(p->p_comm));
 1840                 error = copyinstr((void *)(register_t)args->arg2, comm,
 1841                     max_size, NULL);
 1842 
 1843                 /* Linux silently truncates the name if it is too long. */
 1844                 if (error == ENAMETOOLONG) {
 1845                         /*
 1846                          * XXX: copyinstr() isn't documented to populate the
 1847                          * array completely, so do a copyin() to be on the
 1848                          * safe side. This should be changed in case
 1849                          * copyinstr() is changed to guarantee this.
 1850                          */
 1851                         error = copyin((void *)(register_t)args->arg2, comm,
 1852                             max_size - 1);
 1853                         comm[max_size - 1] = '\0';
 1854                 }
 1855                 if (error)
 1856                         return (error);
 1857 
 1858                 PROC_LOCK(p);
 1859                 strlcpy(p->p_comm, comm, sizeof(p->p_comm));
 1860                 PROC_UNLOCK(p);
 1861                 break;
 1862         case LINUX_PR_GET_NAME:
 1863                 PROC_LOCK(p);
 1864                 strlcpy(comm, p->p_comm, sizeof(comm));
 1865                 PROC_UNLOCK(p);
 1866                 error = copyout(comm, (void *)(register_t)args->arg2,
 1867                     strlen(comm) + 1);
 1868                 break;
 1869         default:
 1870                 error = EINVAL;
 1871                 break;
 1872         }
 1873 
 1874         return (error);
 1875 }
 1876 
 1877 /*
 1878  * Get affinity of a process.
 1879  */
 1880 int
 1881 linux_sched_getaffinity(struct thread *td,
 1882     struct linux_sched_getaffinity_args *args)
 1883 {
 1884         int error;
 1885         struct cpuset_getaffinity_args cga;
 1886 
 1887 #ifdef DEBUG
 1888         if (ldebug(sched_getaffinity))
 1889                 printf(ARGS(sched_getaffinity, "%d, %d, *"), args->pid,
 1890                     args->len);
 1891 #endif
 1892         if (args->len < sizeof(cpuset_t))
 1893                 return (EINVAL);
 1894 
 1895         cga.level = CPU_LEVEL_WHICH;
 1896         cga.which = CPU_WHICH_PID;
 1897         cga.id = args->pid;
 1898         cga.cpusetsize = sizeof(cpuset_t);
 1899         cga.mask = (cpuset_t *) args->user_mask_ptr;
 1900 
 1901         if ((error = sys_cpuset_getaffinity(td, &cga)) == 0)
 1902                 td->td_retval[0] = sizeof(cpuset_t);
 1903 
 1904         return (error);
 1905 }
 1906 
 1907 /*
 1908  *  Set affinity of a process.
 1909  */
 1910 int
 1911 linux_sched_setaffinity(struct thread *td,
 1912     struct linux_sched_setaffinity_args *args)
 1913 {
 1914         struct cpuset_setaffinity_args csa;
 1915 
 1916 #ifdef DEBUG
 1917         if (ldebug(sched_setaffinity))
 1918                 printf(ARGS(sched_setaffinity, "%d, %d, *"), args->pid,
 1919                     args->len);
 1920 #endif
 1921         if (args->len < sizeof(cpuset_t))
 1922                 return (EINVAL);
 1923 
 1924         csa.level = CPU_LEVEL_WHICH;
 1925         csa.which = CPU_WHICH_PID;
 1926         csa.id = args->pid;
 1927         csa.cpusetsize = sizeof(cpuset_t);
 1928         csa.mask = (cpuset_t *) args->user_mask_ptr;
 1929 
 1930         return (sys_cpuset_setaffinity(td, &csa));
 1931 }

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