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("$FreeBSD$");
   32 
   33 #include "opt_compat.h"
   34 #include "opt_mac.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/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 #include <compat/linux/linux_sysproto.h>
   79 #include <compat/linux/linux_emul.h>
   80 #include <compat/linux/linux_misc.h>
   81 
   82 #ifdef COMPAT_LINUX32
   83 #include <machine/../linux32/linux.h>
   84 #include <machine/../linux32/linux32_proto.h>
   85 #else
   86 #include <machine/../linux/linux.h>
   87 #include <machine/../linux/linux_proto.h>
   88 #endif
   89 
   90 #include <compat/linux/linux_mib.h>
   91 #include <compat/linux/linux_signal.h>
   92 #include <compat/linux/linux_util.h>
   93 
   94 #ifdef __i386__
   95 #include <machine/cputypes.h>
   96 #endif
   97 
   98 #define BSD_TO_LINUX_SIGNAL(sig)        \
   99         (((sig) <= LINUX_SIGTBLSZ) ? bsd_to_linux_signal[_SIG_IDX(sig)] : sig)
  100 
  101 static unsigned int linux_to_bsd_resource[LINUX_RLIM_NLIMITS] = {
  102         RLIMIT_CPU, RLIMIT_FSIZE, RLIMIT_DATA, RLIMIT_STACK,
  103         RLIMIT_CORE, RLIMIT_RSS, RLIMIT_NPROC, RLIMIT_NOFILE,
  104         RLIMIT_MEMLOCK, RLIMIT_AS 
  105 };
  106 
  107 struct l_sysinfo {
  108         l_long          uptime;         /* Seconds since boot */
  109         l_ulong         loads[3];       /* 1, 5, and 15 minute load averages */
  110 #define LINUX_SYSINFO_LOADS_SCALE 65536
  111         l_ulong         totalram;       /* Total usable main memory size */
  112         l_ulong         freeram;        /* Available memory size */
  113         l_ulong         sharedram;      /* Amount of shared memory */
  114         l_ulong         bufferram;      /* Memory used by buffers */
  115         l_ulong         totalswap;      /* Total swap space size */
  116         l_ulong         freeswap;       /* swap space still available */
  117         l_ushort        procs;          /* Number of current processes */
  118         l_ushort        pads;
  119         l_ulong         totalbig;
  120         l_ulong         freebig;
  121         l_uint          mem_unit;
  122         char            _f[20-2*sizeof(l_long)-sizeof(l_int)];  /* padding */
  123 };
  124 int
  125 linux_sysinfo(struct thread *td, struct linux_sysinfo_args *args)
  126 {
  127         struct l_sysinfo sysinfo;
  128         vm_object_t object;
  129         int i, j;
  130         struct timespec ts;
  131 
  132         getnanouptime(&ts);
  133         if (ts.tv_nsec != 0)
  134                 ts.tv_sec++;
  135         sysinfo.uptime = ts.tv_sec;
  136 
  137         /* Use the information from the mib to get our load averages */
  138         for (i = 0; i < 3; i++)
  139                 sysinfo.loads[i] = averunnable.ldavg[i] *
  140                     LINUX_SYSINFO_LOADS_SCALE / averunnable.fscale;
  141 
  142         sysinfo.totalram = physmem * PAGE_SIZE;
  143         sysinfo.freeram = sysinfo.totalram - cnt.v_wire_count * PAGE_SIZE;
  144 
  145         sysinfo.sharedram = 0;
  146         mtx_lock(&vm_object_list_mtx);
  147         TAILQ_FOREACH(object, &vm_object_list, object_list)
  148                 if (object->shadow_count > 1)
  149                         sysinfo.sharedram += object->resident_page_count;
  150         mtx_unlock(&vm_object_list_mtx);
  151 
  152         sysinfo.sharedram *= PAGE_SIZE;
  153         sysinfo.bufferram = 0;
  154 
  155         swap_pager_status(&i, &j);
  156         sysinfo.totalswap = i * PAGE_SIZE;
  157         sysinfo.freeswap = (i - j) * PAGE_SIZE;
  158 
  159         sysinfo.procs = nprocs;
  160 
  161         /* The following are only present in newer Linux kernels. */
  162         sysinfo.totalbig = 0;
  163         sysinfo.freebig = 0;
  164         sysinfo.mem_unit = 1;
  165 
  166         return copyout(&sysinfo, args->info, sizeof(sysinfo));
  167 }
  168 
  169 int
  170 linux_alarm(struct thread *td, struct linux_alarm_args *args)
  171 {
  172         struct itimerval it, old_it;
  173         int error;
  174 
  175 #ifdef DEBUG
  176         if (ldebug(alarm))
  177                 printf(ARGS(alarm, "%u"), args->secs);
  178 #endif
  179 
  180         if (args->secs > 100000000)
  181                 return (EINVAL);
  182 
  183         it.it_value.tv_sec = (long)args->secs;
  184         it.it_value.tv_usec = 0;
  185         it.it_interval.tv_sec = 0;
  186         it.it_interval.tv_usec = 0;
  187         error = kern_setitimer(td, ITIMER_REAL, &it, &old_it);
  188         if (error)
  189                 return (error);
  190         if (timevalisset(&old_it.it_value)) {
  191                 if (old_it.it_value.tv_usec != 0)
  192                         old_it.it_value.tv_sec++;
  193                 td->td_retval[0] = old_it.it_value.tv_sec;
  194         }
  195         return (0);
  196 }
  197 
  198 int
  199 linux_brk(struct thread *td, struct linux_brk_args *args)
  200 {
  201         struct vmspace *vm = td->td_proc->p_vmspace;
  202         vm_offset_t new, old;
  203         struct obreak_args /* {
  204                 char * nsize;
  205         } */ tmp;
  206 
  207 #ifdef DEBUG
  208         if (ldebug(brk))
  209                 printf(ARGS(brk, "%p"), (void *)(uintptr_t)args->dsend);
  210 #endif
  211         old = (vm_offset_t)vm->vm_daddr + ctob(vm->vm_dsize);
  212         new = (vm_offset_t)args->dsend;
  213         tmp.nsize = (char *)new;
  214         if (((caddr_t)new > vm->vm_daddr) && !obreak(td, &tmp))
  215                 td->td_retval[0] = (long)new;
  216         else
  217                 td->td_retval[0] = (long)old;
  218 
  219         return 0;
  220 }
  221 
  222 #if defined(__i386__)
  223 /* XXX: what about amd64/linux32? */
  224 
  225 int
  226 linux_uselib(struct thread *td, struct linux_uselib_args *args)
  227 {
  228         struct nameidata ni;
  229         struct vnode *vp;
  230         struct exec *a_out;
  231         struct vattr attr;
  232         vm_offset_t vmaddr;
  233         unsigned long file_offset;
  234         vm_offset_t buffer;
  235         unsigned long bss_size;
  236         char *library;
  237         int error;
  238         int locked, vfslocked;
  239 
  240         LCONVPATHEXIST(td, args->library, &library);
  241 
  242 #ifdef DEBUG
  243         if (ldebug(uselib))
  244                 printf(ARGS(uselib, "%s"), library);
  245 #endif
  246 
  247         a_out = NULL;
  248         vfslocked = 0;
  249         locked = 0;
  250         vp = NULL;
  251 
  252         NDINIT(&ni, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
  253             UIO_SYSSPACE, library, td);
  254         error = namei(&ni);
  255         LFREEPATH(library);
  256         if (error)
  257                 goto cleanup;
  258 
  259         vp = ni.ni_vp;
  260         vfslocked = NDHASGIANT(&ni);
  261         NDFREE(&ni, NDF_ONLY_PNBUF);
  262 
  263         /*
  264          * From here on down, we have a locked vnode that must be unlocked.
  265          * XXX: The code below largely duplicates exec_check_permissions().
  266          */
  267         locked = 1;
  268 
  269         /* Writable? */
  270         if (vp->v_writecount) {
  271                 error = ETXTBSY;
  272                 goto cleanup;
  273         }
  274 
  275         /* Executable? */
  276         error = VOP_GETATTR(vp, &attr, td->td_ucred, td);
  277         if (error)
  278                 goto cleanup;
  279 
  280         if ((vp->v_mount->mnt_flag & MNT_NOEXEC) ||
  281             ((attr.va_mode & 0111) == 0) || (attr.va_type != VREG)) {
  282                 /* EACCESS is what exec(2) returns. */
  283                 error = ENOEXEC;
  284                 goto cleanup;
  285         }
  286 
  287         /* Sensible size? */
  288         if (attr.va_size == 0) {
  289                 error = ENOEXEC;
  290                 goto cleanup;
  291         }
  292 
  293         /* Can we access it? */
  294         error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td);
  295         if (error)
  296                 goto cleanup;
  297 
  298         /*
  299          * XXX: This should use vn_open() so that it is properly authorized,
  300          * and to reduce code redundancy all over the place here.
  301          * XXX: Not really, it duplicates far more of exec_check_permissions()
  302          * than vn_open().
  303          */
  304 #ifdef MAC
  305         error = mac_check_vnode_open(td->td_ucred, vp, FREAD);
  306         if (error)
  307                 goto cleanup;
  308 #endif
  309         error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL);
  310         if (error)
  311                 goto cleanup;
  312 
  313         /* Pull in executable header into kernel_map */
  314         error = vm_mmap(kernel_map, (vm_offset_t *)&a_out, PAGE_SIZE,
  315             VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE, vp, 0);
  316         if (error)
  317                 goto cleanup;
  318 
  319         /* Is it a Linux binary ? */
  320         if (((a_out->a_magic >> 16) & 0xff) != 0x64) {
  321                 error = ENOEXEC;
  322                 goto cleanup;
  323         }
  324 
  325         /*
  326          * While we are here, we should REALLY do some more checks
  327          */
  328 
  329         /* Set file/virtual offset based on a.out variant. */
  330         switch ((int)(a_out->a_magic & 0xffff)) {
  331         case 0413:                      /* ZMAGIC */
  332                 file_offset = 1024;
  333                 break;
  334         case 0314:                      /* QMAGIC */
  335                 file_offset = 0;
  336                 break;
  337         default:
  338                 error = ENOEXEC;
  339                 goto cleanup;
  340         }
  341 
  342         bss_size = round_page(a_out->a_bss);
  343 
  344         /* Check various fields in header for validity/bounds. */
  345         if (a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) {
  346                 error = ENOEXEC;
  347                 goto cleanup;
  348         }
  349 
  350         /* text + data can't exceed file size */
  351         if (a_out->a_data + a_out->a_text > attr.va_size) {
  352                 error = EFAULT;
  353                 goto cleanup;
  354         }
  355 
  356         /*
  357          * text/data/bss must not exceed limits
  358          * XXX - this is not complete. it should check current usage PLUS
  359          * the resources needed by this library.
  360          */
  361         PROC_LOCK(td->td_proc);
  362         if (a_out->a_text > maxtsiz ||
  363             a_out->a_data + bss_size > lim_cur(td->td_proc, RLIMIT_DATA)) {
  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, td);
  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, td);
  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);
  526 
  527 #ifdef DEBUG
  528         if (ldebug(select))
  529                 printf(LMSG("real select returns %d"), error);
  530 #endif
  531         if (error) {
  532                 /*
  533                  * See fs/select.c in the Linux kernel.  Without this,
  534                  * Maelstrom doesn't work.
  535                  */
  536                 if (error == ERESTART)
  537                         error = EINTR;
  538                 goto select_out;
  539         }
  540 
  541         if (args->timeout) {
  542                 if (td->td_retval[0]) {
  543                         /*
  544                          * Compute how much time was left of the timeout,
  545                          * by subtracting the current time and the time
  546                          * before we started the call, and subtracting
  547                          * that result from the user-supplied value.
  548                          */
  549                         microtime(&tv1);
  550                         timevalsub(&tv1, &tv0);
  551                         timevalsub(&utv, &tv1);
  552                         if (utv.tv_sec < 0)
  553                                 timevalclear(&utv);
  554                 } else
  555                         timevalclear(&utv);
  556 #ifdef DEBUG
  557                 if (ldebug(select))
  558                         printf(LMSG("outgoing timeout (%jd/%ld)"),
  559                             (intmax_t)utv.tv_sec, utv.tv_usec);
  560 #endif
  561                 ltv.tv_sec = utv.tv_sec;
  562                 ltv.tv_usec = utv.tv_usec;
  563                 if ((error = copyout(&ltv, args->timeout, sizeof(ltv))))
  564                         goto select_out;
  565         }
  566 
  567 select_out:
  568 #ifdef DEBUG
  569         if (ldebug(select))
  570                 printf(LMSG("select_out -> %d"), error);
  571 #endif
  572         return error;
  573 }
  574 
  575 int
  576 linux_mremap(struct thread *td, struct linux_mremap_args *args)
  577 {
  578         struct munmap_args /* {
  579                 void *addr;
  580                 size_t len;
  581         } */ bsd_args;
  582         int error = 0;
  583 
  584 #ifdef DEBUG
  585         if (ldebug(mremap))
  586                 printf(ARGS(mremap, "%p, %08lx, %08lx, %08lx"),
  587                     (void *)(uintptr_t)args->addr,
  588                     (unsigned long)args->old_len,
  589                     (unsigned long)args->new_len,
  590                     (unsigned long)args->flags);
  591 #endif
  592 
  593         if (args->flags & ~(LINUX_MREMAP_FIXED | LINUX_MREMAP_MAYMOVE)) {
  594                 td->td_retval[0] = 0;
  595                 return (EINVAL);
  596         }
  597 
  598         /*
  599          * Check for the page alignment.
  600          * Linux defines PAGE_MASK to be FreeBSD ~PAGE_MASK.
  601          */
  602         if (args->addr & PAGE_MASK) {
  603                 td->td_retval[0] = 0;
  604                 return (EINVAL);
  605         }
  606 
  607         args->new_len = round_page(args->new_len);
  608         args->old_len = round_page(args->old_len);
  609 
  610         if (args->new_len > args->old_len) {
  611                 td->td_retval[0] = 0;
  612                 return ENOMEM;
  613         }
  614 
  615         if (args->new_len < args->old_len) {
  616                 bsd_args.addr =
  617                     (caddr_t)((uintptr_t)args->addr + args->new_len);
  618                 bsd_args.len = args->old_len - args->new_len;
  619                 error = munmap(td, &bsd_args);
  620         }
  621 
  622         td->td_retval[0] = error ? 0 : (uintptr_t)args->addr;
  623         return error;
  624 }
  625 
  626 #define LINUX_MS_ASYNC       0x0001
  627 #define LINUX_MS_INVALIDATE  0x0002
  628 #define LINUX_MS_SYNC        0x0004
  629 
  630 int
  631 linux_msync(struct thread *td, struct linux_msync_args *args)
  632 {
  633         struct msync_args bsd_args;
  634 
  635         bsd_args.addr = (caddr_t)(uintptr_t)args->addr;
  636         bsd_args.len = (uintptr_t)args->len;
  637         bsd_args.flags = args->fl & ~LINUX_MS_SYNC;
  638 
  639         return msync(td, &bsd_args);
  640 }
  641 
  642 int
  643 linux_time(struct thread *td, struct linux_time_args *args)
  644 {
  645         struct timeval tv;
  646         l_time_t tm;
  647         int error;
  648 
  649 #ifdef DEBUG
  650         if (ldebug(time))
  651                 printf(ARGS(time, "*"));
  652 #endif
  653 
  654         microtime(&tv);
  655         tm = tv.tv_sec;
  656         if (args->tm && (error = copyout(&tm, args->tm, sizeof(tm))))
  657                 return error;
  658         td->td_retval[0] = tm;
  659         return 0;
  660 }
  661 
  662 struct l_times_argv {
  663         l_long  tms_utime;
  664         l_long  tms_stime;
  665         l_long  tms_cutime;
  666         l_long  tms_cstime;
  667 };
  668 
  669 #define CLK_TCK 100                     /* Linux uses 100 */
  670 
  671 #define CONVTCK(r)      (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
  672 
  673 int
  674 linux_times(struct thread *td, struct linux_times_args *args)
  675 {
  676         struct timeval tv, utime, stime, cutime, cstime;
  677         struct l_times_argv tms;
  678         struct proc *p;
  679         int error;
  680 
  681 #ifdef DEBUG
  682         if (ldebug(times))
  683                 printf(ARGS(times, "*"));
  684 #endif
  685 
  686         if (args->buf != NULL) {
  687                 p = td->td_proc;
  688                 PROC_LOCK(p);
  689                 PROC_SLOCK(p);
  690                 calcru(p, &utime, &stime);
  691                 PROC_SUNLOCK(p);
  692                 calccru(p, &cutime, &cstime);
  693                 PROC_UNLOCK(p);
  694 
  695                 tms.tms_utime = CONVTCK(utime);
  696                 tms.tms_stime = CONVTCK(stime);
  697 
  698                 tms.tms_cutime = CONVTCK(cutime);
  699                 tms.tms_cstime = CONVTCK(cstime);
  700 
  701                 if ((error = copyout(&tms, args->buf, sizeof(tms))))
  702                         return error;
  703         }
  704 
  705         microuptime(&tv);
  706         td->td_retval[0] = (int)CONVTCK(tv);
  707         return 0;
  708 }
  709 
  710 int
  711 linux_newuname(struct thread *td, struct linux_newuname_args *args)
  712 {
  713         struct l_new_utsname utsname;
  714         char osname[LINUX_MAX_UTSNAME];
  715         char osrelease[LINUX_MAX_UTSNAME];
  716         char *p;
  717 
  718 #ifdef DEBUG
  719         if (ldebug(newuname))
  720                 printf(ARGS(newuname, "*"));
  721 #endif
  722 
  723         linux_get_osname(td, osname);
  724         linux_get_osrelease(td, osrelease);
  725 
  726         bzero(&utsname, sizeof(utsname));
  727         strlcpy(utsname.sysname, osname, LINUX_MAX_UTSNAME);
  728         getcredhostname(td->td_ucred, utsname.nodename, LINUX_MAX_UTSNAME);
  729         strlcpy(utsname.release, osrelease, LINUX_MAX_UTSNAME);
  730         strlcpy(utsname.version, version, LINUX_MAX_UTSNAME);
  731         for (p = utsname.version; *p != '\0'; ++p)
  732                 if (*p == '\n') {
  733                         *p = '\0';
  734                         break;
  735                 }
  736 #ifdef __i386__
  737         {
  738                 const char *class;
  739 
  740                 switch (cpu_class) {
  741                 case CPUCLASS_686:
  742                         class = "i686";
  743                         break;
  744                 case CPUCLASS_586:
  745                         class = "i586";
  746                         break;
  747                 case CPUCLASS_486:
  748                         class = "i486";
  749                         break;
  750                 default:
  751                         class = "i386";
  752                 }
  753                 strlcpy(utsname.machine, class, LINUX_MAX_UTSNAME);
  754         }
  755 #elif defined(__amd64__)        /* XXX: Linux can change 'personality'. */
  756 #ifdef COMPAT_LINUX32
  757         strlcpy(utsname.machine, "i686", LINUX_MAX_UTSNAME);
  758 #else
  759         strlcpy(utsname.machine, "x86_64", LINUX_MAX_UTSNAME);
  760 #endif /* COMPAT_LINUX32 */
  761 #else /* something other than i386 or amd64 - assume we and Linux agree */
  762         strlcpy(utsname.machine, machine, LINUX_MAX_UTSNAME);
  763 #endif /* __i386__ */
  764         strlcpy(utsname.domainname, domainname, LINUX_MAX_UTSNAME);
  765 
  766         return (copyout(&utsname, args->buf, sizeof(utsname)));
  767 }
  768 
  769 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  770 struct l_utimbuf {
  771         l_time_t l_actime;
  772         l_time_t l_modtime;
  773 };
  774 
  775 int
  776 linux_utime(struct thread *td, struct linux_utime_args *args)
  777 {
  778         struct timeval tv[2], *tvp;
  779         struct l_utimbuf lut;
  780         char *fname;
  781         int error;
  782 
  783         LCONVPATHEXIST(td, args->fname, &fname);
  784 
  785 #ifdef DEBUG
  786         if (ldebug(utime))
  787                 printf(ARGS(utime, "%s, *"), fname);
  788 #endif
  789 
  790         if (args->times) {
  791                 if ((error = copyin(args->times, &lut, sizeof lut))) {
  792                         LFREEPATH(fname);
  793                         return error;
  794                 }
  795                 tv[0].tv_sec = lut.l_actime;
  796                 tv[0].tv_usec = 0;
  797                 tv[1].tv_sec = lut.l_modtime;
  798                 tv[1].tv_usec = 0;
  799                 tvp = tv;
  800         } else
  801                 tvp = NULL;
  802 
  803         error = kern_utimes(td, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  804         LFREEPATH(fname);
  805         return (error);
  806 }
  807 
  808 int
  809 linux_utimes(struct thread *td, struct linux_utimes_args *args)
  810 {
  811         l_timeval ltv[2];
  812         struct timeval tv[2], *tvp = NULL;
  813         char *fname;
  814         int error;
  815 
  816         LCONVPATHEXIST(td, args->fname, &fname);
  817 
  818 #ifdef DEBUG
  819         if (ldebug(utimes))
  820                 printf(ARGS(utimes, "%s, *"), fname);
  821 #endif
  822 
  823         if (args->tptr != NULL) {
  824                 if ((error = copyin(args->tptr, ltv, sizeof ltv))) {
  825                         LFREEPATH(fname);
  826                         return (error);
  827                 }
  828                 tv[0].tv_sec = ltv[0].tv_sec;
  829                 tv[0].tv_usec = ltv[0].tv_usec;
  830                 tv[1].tv_sec = ltv[1].tv_sec;
  831                 tv[1].tv_usec = ltv[1].tv_usec;
  832                 tvp = tv;
  833         }
  834 
  835         error = kern_utimes(td, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  836         LFREEPATH(fname);
  837         return (error);
  838 }
  839 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
  840 
  841 #define __WCLONE 0x80000000
  842 
  843 int
  844 linux_waitpid(struct thread *td, struct linux_waitpid_args *args)
  845 {
  846         int error, options, tmpstat;
  847 
  848 #ifdef DEBUG
  849         if (ldebug(waitpid))
  850                 printf(ARGS(waitpid, "%d, %p, %d"),
  851                     args->pid, (void *)args->status, args->options);
  852 #endif
  853         /*
  854          * this is necessary because the test in kern_wait doesn't work
  855          * because we mess with the options here
  856          */
  857         if (args->options & ~(WUNTRACED | WNOHANG | WCONTINUED | __WCLONE))
  858                 return (EINVAL);
  859 
  860         options = (args->options & (WNOHANG | WUNTRACED));
  861         /* WLINUXCLONE should be equal to __WCLONE, but we make sure */
  862         if (args->options & __WCLONE)
  863                 options |= WLINUXCLONE;
  864 
  865         error = kern_wait(td, args->pid, &tmpstat, options, NULL);
  866         if (error)
  867                 return error;
  868 
  869         if (args->status) {
  870                 tmpstat &= 0xffff;
  871                 if (WIFSIGNALED(tmpstat))
  872                         tmpstat = (tmpstat & 0xffffff80) |
  873                             BSD_TO_LINUX_SIGNAL(WTERMSIG(tmpstat));
  874                 else if (WIFSTOPPED(tmpstat))
  875                         tmpstat = (tmpstat & 0xffff00ff) |
  876                             (BSD_TO_LINUX_SIGNAL(WSTOPSIG(tmpstat)) << 8);
  877                 return copyout(&tmpstat, args->status, sizeof(int));
  878         }
  879 
  880         return 0;
  881 }
  882 
  883 int
  884 linux_wait4(struct thread *td, struct linux_wait4_args *args)
  885 {
  886         int error, options, tmpstat;
  887         struct rusage ru, *rup;
  888         struct proc *p;
  889 
  890 #ifdef DEBUG
  891         if (ldebug(wait4))
  892                 printf(ARGS(wait4, "%d, %p, %d, %p"),
  893                     args->pid, (void *)args->status, args->options,
  894                     (void *)args->rusage);
  895 #endif
  896 
  897         options = (args->options & (WNOHANG | WUNTRACED));
  898         /* WLINUXCLONE should be equal to __WCLONE, but we make sure */
  899         if (args->options & __WCLONE)
  900                 options |= WLINUXCLONE;
  901 
  902         if (args->rusage != NULL)
  903                 rup = &ru;
  904         else
  905                 rup = NULL;
  906         error = kern_wait(td, args->pid, &tmpstat, options, rup);
  907         if (error)
  908                 return error;
  909 
  910         p = td->td_proc;
  911         PROC_LOCK(p);
  912         sigqueue_delete(&p->p_sigqueue, SIGCHLD);
  913         PROC_UNLOCK(p);
  914 
  915         if (args->status) {
  916                 tmpstat &= 0xffff;
  917                 if (WIFSIGNALED(tmpstat))
  918                         tmpstat = (tmpstat & 0xffffff80) |
  919                             BSD_TO_LINUX_SIGNAL(WTERMSIG(tmpstat));
  920                 else if (WIFSTOPPED(tmpstat))
  921                         tmpstat = (tmpstat & 0xffff00ff) |
  922                             (BSD_TO_LINUX_SIGNAL(WSTOPSIG(tmpstat)) << 8);
  923                 error = copyout(&tmpstat, args->status, sizeof(int));
  924         }
  925         if (args->rusage != NULL && error == 0)
  926                 error = copyout(&ru, args->rusage, sizeof(ru));
  927 
  928         return (error);
  929 }
  930 
  931 int
  932 linux_mknod(struct thread *td, struct linux_mknod_args *args)
  933 {
  934         char *path;
  935         int error;
  936 
  937         LCONVPATHCREAT(td, args->path, &path);
  938 
  939 #ifdef DEBUG
  940         if (ldebug(mknod))
  941                 printf(ARGS(mknod, "%s, %d, %d"), path, args->mode, args->dev);
  942 #endif
  943 
  944         switch (args->mode & S_IFMT) {
  945         case S_IFIFO:
  946         case S_IFSOCK:
  947                 error = kern_mkfifo(td, path, UIO_SYSSPACE, args->mode);
  948                 break;
  949 
  950         case S_IFCHR:
  951         case S_IFBLK:
  952                 error = kern_mknod(td, path, UIO_SYSSPACE, args->mode,
  953                     args->dev);
  954                 break;
  955 
  956         case S_IFDIR:
  957                 error = EPERM;
  958                 break;
  959 
  960         case 0:
  961                 args->mode |= S_IFREG;
  962                 /* FALLTHROUGH */
  963         case S_IFREG:
  964                 error = kern_open(td, path, UIO_SYSSPACE,
  965                     O_WRONLY | O_CREAT | O_TRUNC, args->mode);
  966                 break;
  967 
  968         default:
  969                 error = EINVAL;
  970                 break;
  971         }
  972         LFREEPATH(path);
  973         return (error);
  974 }
  975 
  976 /*
  977  * UGH! This is just about the dumbest idea I've ever heard!!
  978  */
  979 int
  980 linux_personality(struct thread *td, struct linux_personality_args *args)
  981 {
  982 #ifdef DEBUG
  983         if (ldebug(personality))
  984                 printf(ARGS(personality, "%lu"), (unsigned long)args->per);
  985 #endif
  986         if (args->per != 0)
  987                 return EINVAL;
  988 
  989         /* Yes Jim, it's still a Linux... */
  990         td->td_retval[0] = 0;
  991         return 0;
  992 }
  993 
  994 struct l_itimerval {
  995         l_timeval it_interval;
  996         l_timeval it_value;
  997 };
  998 
  999 #define B2L_ITIMERVAL(bip, lip)                                         \
 1000         (bip)->it_interval.tv_sec = (lip)->it_interval.tv_sec;          \
 1001         (bip)->it_interval.tv_usec = (lip)->it_interval.tv_usec;        \
 1002         (bip)->it_value.tv_sec = (lip)->it_value.tv_sec;                \
 1003         (bip)->it_value.tv_usec = (lip)->it_value.tv_usec;
 1004 
 1005 int
 1006 linux_setitimer(struct thread *td, struct linux_setitimer_args *uap)
 1007 {
 1008         int error;
 1009         struct l_itimerval ls;
 1010         struct itimerval aitv, oitv;
 1011 
 1012 #ifdef DEBUG
 1013         if (ldebug(setitimer))
 1014                 printf(ARGS(setitimer, "%p, %p"),
 1015                     (void *)uap->itv, (void *)uap->oitv);
 1016 #endif
 1017 
 1018         if (uap->itv == NULL) {
 1019                 uap->itv = uap->oitv;
 1020                 return (linux_getitimer(td, (struct linux_getitimer_args *)uap));
 1021         }
 1022 
 1023         error = copyin(uap->itv, &ls, sizeof(ls));
 1024         if (error != 0)
 1025                 return (error);
 1026         B2L_ITIMERVAL(&aitv, &ls);
 1027 #ifdef DEBUG
 1028         if (ldebug(setitimer)) {
 1029                 printf("setitimer: value: sec: %jd, usec: %ld\n",
 1030                     (intmax_t)aitv.it_value.tv_sec, aitv.it_value.tv_usec);
 1031                 printf("setitimer: interval: sec: %jd, usec: %ld\n",
 1032                     (intmax_t)aitv.it_interval.tv_sec, aitv.it_interval.tv_usec);
 1033         }
 1034 #endif
 1035         error = kern_setitimer(td, uap->which, &aitv, &oitv);
 1036         if (error != 0 || uap->oitv == NULL)
 1037                 return (error);
 1038         B2L_ITIMERVAL(&ls, &oitv);
 1039 
 1040         return (copyout(&ls, uap->oitv, sizeof(ls)));
 1041 }
 1042 
 1043 int
 1044 linux_getitimer(struct thread *td, struct linux_getitimer_args *uap)
 1045 {
 1046         int error;
 1047         struct l_itimerval ls;
 1048         struct itimerval aitv;
 1049 
 1050 #ifdef DEBUG
 1051         if (ldebug(getitimer))
 1052                 printf(ARGS(getitimer, "%p"), (void *)uap->itv);
 1053 #endif
 1054         error = kern_getitimer(td, uap->which, &aitv);
 1055         if (error != 0)
 1056                 return (error);
 1057         B2L_ITIMERVAL(&ls, &aitv);
 1058         return (copyout(&ls, uap->itv, sizeof(ls)));
 1059 }
 1060 
 1061 int
 1062 linux_nice(struct thread *td, struct linux_nice_args *args)
 1063 {
 1064         struct setpriority_args bsd_args;
 1065 
 1066         bsd_args.which = PRIO_PROCESS;
 1067         bsd_args.who = 0;               /* current process */
 1068         bsd_args.prio = args->inc;
 1069         return setpriority(td, &bsd_args);
 1070 }
 1071 
 1072 int
 1073 linux_setgroups(struct thread *td, struct linux_setgroups_args *args)
 1074 {
 1075         struct ucred *newcred, *oldcred;
 1076         l_gid_t linux_gidset[NGROUPS];
 1077         gid_t *bsd_gidset;
 1078         int ngrp, error;
 1079         struct proc *p;
 1080 
 1081         ngrp = args->gidsetsize;
 1082         if (ngrp < 0 || ngrp >= NGROUPS)
 1083                 return (EINVAL);
 1084         error = copyin(args->grouplist, linux_gidset, ngrp * sizeof(l_gid_t));
 1085         if (error)
 1086                 return (error);
 1087         newcred = crget();
 1088         p = td->td_proc;
 1089         PROC_LOCK(p);
 1090         oldcred = p->p_ucred;
 1091 
 1092         /*
 1093          * cr_groups[0] holds egid. Setting the whole set from
 1094          * the supplied set will cause egid to be changed too.
 1095          * Keep cr_groups[0] unchanged to prevent that.
 1096          */
 1097 
 1098         if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) {
 1099                 PROC_UNLOCK(p);
 1100                 crfree(newcred);
 1101                 return (error);
 1102         }
 1103 
 1104         crcopy(newcred, oldcred);
 1105         if (ngrp > 0) {
 1106                 newcred->cr_ngroups = ngrp + 1;
 1107 
 1108                 bsd_gidset = newcred->cr_groups;
 1109                 ngrp--;
 1110                 while (ngrp >= 0) {
 1111                         bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
 1112                         ngrp--;
 1113                 }
 1114         } else
 1115                 newcred->cr_ngroups = 1;
 1116 
 1117         setsugid(p);
 1118         p->p_ucred = newcred;
 1119         PROC_UNLOCK(p);
 1120         crfree(oldcred);
 1121         return (0);
 1122 }
 1123 
 1124 int
 1125 linux_getgroups(struct thread *td, struct linux_getgroups_args *args)
 1126 {
 1127         struct ucred *cred;
 1128         l_gid_t linux_gidset[NGROUPS];
 1129         gid_t *bsd_gidset;
 1130         int bsd_gidsetsz, ngrp, error;
 1131 
 1132         cred = td->td_ucred;
 1133         bsd_gidset = cred->cr_groups;
 1134         bsd_gidsetsz = cred->cr_ngroups - 1;
 1135 
 1136         /*
 1137          * cr_groups[0] holds egid. Returning the whole set
 1138          * here will cause a duplicate. Exclude cr_groups[0]
 1139          * to prevent that.
 1140          */
 1141 
 1142         if ((ngrp = args->gidsetsize) == 0) {
 1143                 td->td_retval[0] = bsd_gidsetsz;
 1144                 return (0);
 1145         }
 1146 
 1147         if (ngrp < bsd_gidsetsz)
 1148                 return (EINVAL);
 1149 
 1150         ngrp = 0;
 1151         while (ngrp < bsd_gidsetsz) {
 1152                 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
 1153                 ngrp++;
 1154         }
 1155 
 1156         if ((error = copyout(linux_gidset, args->grouplist,
 1157             ngrp * sizeof(l_gid_t))))
 1158                 return (error);
 1159 
 1160         td->td_retval[0] = ngrp;
 1161         return (0);
 1162 }
 1163 
 1164 int
 1165 linux_setrlimit(struct thread *td, struct linux_setrlimit_args *args)
 1166 {
 1167         struct rlimit bsd_rlim;
 1168         struct l_rlimit rlim;
 1169         u_int which;
 1170         int error;
 1171 
 1172 #ifdef DEBUG
 1173         if (ldebug(setrlimit))
 1174                 printf(ARGS(setrlimit, "%d, %p"),
 1175                     args->resource, (void *)args->rlim);
 1176 #endif
 1177 
 1178         if (args->resource >= LINUX_RLIM_NLIMITS)
 1179                 return (EINVAL);
 1180 
 1181         which = linux_to_bsd_resource[args->resource];
 1182         if (which == -1)
 1183                 return (EINVAL);
 1184 
 1185         error = copyin(args->rlim, &rlim, sizeof(rlim));
 1186         if (error)
 1187                 return (error);
 1188 
 1189         bsd_rlim.rlim_cur = (rlim_t)rlim.rlim_cur;
 1190         bsd_rlim.rlim_max = (rlim_t)rlim.rlim_max;
 1191         return (kern_setrlimit(td, which, &bsd_rlim));
 1192 }
 1193 
 1194 int
 1195 linux_old_getrlimit(struct thread *td, struct linux_old_getrlimit_args *args)
 1196 {
 1197         struct l_rlimit rlim;
 1198         struct proc *p = td->td_proc;
 1199         struct rlimit bsd_rlim;
 1200         u_int which;
 1201 
 1202 #ifdef DEBUG
 1203         if (ldebug(old_getrlimit))
 1204                 printf(ARGS(old_getrlimit, "%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         PROC_LOCK(p);
 1216         lim_rlimit(p, which, &bsd_rlim);
 1217         PROC_UNLOCK(p);
 1218 
 1219 #ifdef COMPAT_LINUX32
 1220         rlim.rlim_cur = (unsigned int)bsd_rlim.rlim_cur;
 1221         if (rlim.rlim_cur == UINT_MAX)
 1222                 rlim.rlim_cur = INT_MAX;
 1223         rlim.rlim_max = (unsigned int)bsd_rlim.rlim_max;
 1224         if (rlim.rlim_max == UINT_MAX)
 1225                 rlim.rlim_max = INT_MAX;
 1226 #else
 1227         rlim.rlim_cur = (unsigned long)bsd_rlim.rlim_cur;
 1228         if (rlim.rlim_cur == ULONG_MAX)
 1229                 rlim.rlim_cur = LONG_MAX;
 1230         rlim.rlim_max = (unsigned long)bsd_rlim.rlim_max;
 1231         if (rlim.rlim_max == ULONG_MAX)
 1232                 rlim.rlim_max = LONG_MAX;
 1233 #endif
 1234         return (copyout(&rlim, args->rlim, sizeof(rlim)));
 1235 }
 1236 
 1237 int
 1238 linux_getrlimit(struct thread *td, struct linux_getrlimit_args *args)
 1239 {
 1240         struct l_rlimit rlim;
 1241         struct proc *p = td->td_proc;
 1242         struct rlimit bsd_rlim;
 1243         u_int which;
 1244 
 1245 #ifdef DEBUG
 1246         if (ldebug(getrlimit))
 1247                 printf(ARGS(getrlimit, "%d, %p"),
 1248                     args->resource, (void *)args->rlim);
 1249 #endif
 1250 
 1251         if (args->resource >= LINUX_RLIM_NLIMITS)
 1252                 return (EINVAL);
 1253 
 1254         which = linux_to_bsd_resource[args->resource];
 1255         if (which == -1)
 1256                 return (EINVAL);
 1257 
 1258         PROC_LOCK(p);
 1259         lim_rlimit(p, which, &bsd_rlim);
 1260         PROC_UNLOCK(p);
 1261 
 1262         rlim.rlim_cur = (l_ulong)bsd_rlim.rlim_cur;
 1263         rlim.rlim_max = (l_ulong)bsd_rlim.rlim_max;
 1264         return (copyout(&rlim, args->rlim, sizeof(rlim)));
 1265 }
 1266 
 1267 int
 1268 linux_sched_setscheduler(struct thread *td,
 1269     struct linux_sched_setscheduler_args *args)
 1270 {
 1271         struct sched_setscheduler_args bsd;
 1272 
 1273 #ifdef DEBUG
 1274         if (ldebug(sched_setscheduler))
 1275                 printf(ARGS(sched_setscheduler, "%d, %d, %p"),
 1276                     args->pid, args->policy, (const void *)args->param);
 1277 #endif
 1278 
 1279         switch (args->policy) {
 1280         case LINUX_SCHED_OTHER:
 1281                 bsd.policy = SCHED_OTHER;
 1282                 break;
 1283         case LINUX_SCHED_FIFO:
 1284                 bsd.policy = SCHED_FIFO;
 1285                 break;
 1286         case LINUX_SCHED_RR:
 1287                 bsd.policy = SCHED_RR;
 1288                 break;
 1289         default:
 1290                 return EINVAL;
 1291         }
 1292 
 1293         bsd.pid = args->pid;
 1294         bsd.param = (struct sched_param *)args->param;
 1295         return sched_setscheduler(td, &bsd);
 1296 }
 1297 
 1298 int
 1299 linux_sched_getscheduler(struct thread *td,
 1300     struct linux_sched_getscheduler_args *args)
 1301 {
 1302         struct sched_getscheduler_args bsd;
 1303         int error;
 1304 
 1305 #ifdef DEBUG
 1306         if (ldebug(sched_getscheduler))
 1307                 printf(ARGS(sched_getscheduler, "%d"), args->pid);
 1308 #endif
 1309 
 1310         bsd.pid = args->pid;
 1311         error = sched_getscheduler(td, &bsd);
 1312 
 1313         switch (td->td_retval[0]) {
 1314         case SCHED_OTHER:
 1315                 td->td_retval[0] = LINUX_SCHED_OTHER;
 1316                 break;
 1317         case SCHED_FIFO:
 1318                 td->td_retval[0] = LINUX_SCHED_FIFO;
 1319                 break;
 1320         case SCHED_RR:
 1321                 td->td_retval[0] = LINUX_SCHED_RR;
 1322                 break;
 1323         }
 1324 
 1325         return error;
 1326 }
 1327 
 1328 int
 1329 linux_sched_get_priority_max(struct thread *td,
 1330     struct linux_sched_get_priority_max_args *args)
 1331 {
 1332         struct sched_get_priority_max_args bsd;
 1333 
 1334 #ifdef DEBUG
 1335         if (ldebug(sched_get_priority_max))
 1336                 printf(ARGS(sched_get_priority_max, "%d"), args->policy);
 1337 #endif
 1338 
 1339         switch (args->policy) {
 1340         case LINUX_SCHED_OTHER:
 1341                 bsd.policy = SCHED_OTHER;
 1342                 break;
 1343         case LINUX_SCHED_FIFO:
 1344                 bsd.policy = SCHED_FIFO;
 1345                 break;
 1346         case LINUX_SCHED_RR:
 1347                 bsd.policy = SCHED_RR;
 1348                 break;
 1349         default:
 1350                 return EINVAL;
 1351         }
 1352         return sched_get_priority_max(td, &bsd);
 1353 }
 1354 
 1355 int
 1356 linux_sched_get_priority_min(struct thread *td,
 1357     struct linux_sched_get_priority_min_args *args)
 1358 {
 1359         struct sched_get_priority_min_args bsd;
 1360 
 1361 #ifdef DEBUG
 1362         if (ldebug(sched_get_priority_min))
 1363                 printf(ARGS(sched_get_priority_min, "%d"), args->policy);
 1364 #endif
 1365 
 1366         switch (args->policy) {
 1367         case LINUX_SCHED_OTHER:
 1368                 bsd.policy = SCHED_OTHER;
 1369                 break;
 1370         case LINUX_SCHED_FIFO:
 1371                 bsd.policy = SCHED_FIFO;
 1372                 break;
 1373         case LINUX_SCHED_RR:
 1374                 bsd.policy = SCHED_RR;
 1375                 break;
 1376         default:
 1377                 return EINVAL;
 1378         }
 1379         return sched_get_priority_min(td, &bsd);
 1380 }
 1381 
 1382 #define REBOOT_CAD_ON   0x89abcdef
 1383 #define REBOOT_CAD_OFF  0
 1384 #define REBOOT_HALT     0xcdef0123
 1385 #define REBOOT_RESTART  0x01234567
 1386 #define REBOOT_RESTART2 0xA1B2C3D4
 1387 #define REBOOT_POWEROFF 0x4321FEDC
 1388 #define REBOOT_MAGIC1   0xfee1dead
 1389 #define REBOOT_MAGIC2   0x28121969
 1390 #define REBOOT_MAGIC2A  0x05121996
 1391 #define REBOOT_MAGIC2B  0x16041998
 1392 
 1393 int
 1394 linux_reboot(struct thread *td, struct linux_reboot_args *args)
 1395 {
 1396         struct reboot_args bsd_args;
 1397 
 1398 #ifdef DEBUG
 1399         if (ldebug(reboot))
 1400                 printf(ARGS(reboot, "0x%x"), args->cmd);
 1401 #endif
 1402 
 1403         if (args->magic1 != REBOOT_MAGIC1)
 1404                 return EINVAL;
 1405 
 1406         switch (args->magic2) {
 1407         case REBOOT_MAGIC2:
 1408         case REBOOT_MAGIC2A:
 1409         case REBOOT_MAGIC2B:
 1410                 break;
 1411         default:
 1412                 return EINVAL;
 1413         }
 1414 
 1415         switch (args->cmd) {
 1416         case REBOOT_CAD_ON:
 1417         case REBOOT_CAD_OFF:
 1418                 return (priv_check(td, PRIV_REBOOT));
 1419         case REBOOT_HALT:
 1420                 bsd_args.opt = RB_HALT;
 1421                 break;
 1422         case REBOOT_RESTART:
 1423         case REBOOT_RESTART2:
 1424                 bsd_args.opt = 0;
 1425                 break;
 1426         case REBOOT_POWEROFF:
 1427                 bsd_args.opt = RB_POWEROFF;
 1428                 break;
 1429         default:
 1430                 return EINVAL;
 1431         }
 1432         return reboot(td, &bsd_args);
 1433 }
 1434 
 1435 
 1436 /*
 1437  * The FreeBSD native getpid(2), getgid(2) and getuid(2) also modify
 1438  * td->td_retval[1] when COMPAT_43 is defined. This clobbers registers that
 1439  * are assumed to be preserved. The following lightweight syscalls fixes
 1440  * this. See also linux_getgid16() and linux_getuid16() in linux_uid16.c
 1441  *
 1442  * linux_getpid() - MP SAFE
 1443  * linux_getgid() - MP SAFE
 1444  * linux_getuid() - MP SAFE
 1445  */
 1446 
 1447 int
 1448 linux_getpid(struct thread *td, struct linux_getpid_args *args)
 1449 {
 1450         struct linux_emuldata *em;
 1451 
 1452 #ifdef DEBUG
 1453         if (ldebug(getpid))
 1454                 printf(ARGS(getpid, ""));
 1455 #endif
 1456 
 1457         if (linux_use26(td)) {
 1458                 em = em_find(td->td_proc, EMUL_DONTLOCK);
 1459                 KASSERT(em != NULL, ("getpid: emuldata not found.\n"));
 1460                 td->td_retval[0] = em->shared->group_pid;
 1461         } else {
 1462                 td->td_retval[0] = td->td_proc->p_pid;
 1463         }
 1464 
 1465         return (0);
 1466 }
 1467 
 1468 int
 1469 linux_gettid(struct thread *td, struct linux_gettid_args *args)
 1470 {
 1471 
 1472 #ifdef DEBUG
 1473         if (ldebug(gettid))
 1474                 printf(ARGS(gettid, ""));
 1475 #endif
 1476 
 1477         td->td_retval[0] = td->td_proc->p_pid;
 1478         return (0);
 1479 }
 1480 
 1481 
 1482 int
 1483 linux_getppid(struct thread *td, struct linux_getppid_args *args)
 1484 {
 1485         struct linux_emuldata *em;
 1486         struct proc *p, *pp;
 1487 
 1488 #ifdef DEBUG
 1489         if (ldebug(getppid))
 1490                 printf(ARGS(getppid, ""));
 1491 #endif
 1492 
 1493         if (!linux_use26(td)) {
 1494                 PROC_LOCK(td->td_proc);
 1495                 td->td_retval[0] = td->td_proc->p_pptr->p_pid;
 1496                 PROC_UNLOCK(td->td_proc);
 1497                 return (0);
 1498         }
 1499 
 1500         em = em_find(td->td_proc, EMUL_DONTLOCK);
 1501 
 1502         KASSERT(em != NULL, ("getppid: process emuldata not found.\n"));
 1503 
 1504         /* find the group leader */
 1505         p = pfind(em->shared->group_pid);
 1506 
 1507         if (p == NULL) {
 1508 #ifdef DEBUG
 1509                 printf(LMSG("parent process not found.\n"));
 1510 #endif
 1511                 return (0);
 1512         }
 1513 
 1514         pp = p->p_pptr;         /* switch to parent */
 1515         PROC_LOCK(pp);
 1516         PROC_UNLOCK(p);
 1517 
 1518         /* if its also linux process */
 1519         if (pp->p_sysent == &elf_linux_sysvec) {
 1520                 em = em_find(pp, EMUL_DONTLOCK);
 1521                 KASSERT(em != NULL, ("getppid: parent emuldata not found.\n"));
 1522 
 1523                 td->td_retval[0] = em->shared->group_pid;
 1524         } else
 1525                 td->td_retval[0] = pp->p_pid;
 1526 
 1527         PROC_UNLOCK(pp);
 1528 
 1529         return (0);
 1530 }
 1531 
 1532 int
 1533 linux_getgid(struct thread *td, struct linux_getgid_args *args)
 1534 {
 1535 
 1536 #ifdef DEBUG
 1537         if (ldebug(getgid))
 1538                 printf(ARGS(getgid, ""));
 1539 #endif
 1540 
 1541         td->td_retval[0] = td->td_ucred->cr_rgid;
 1542         return (0);
 1543 }
 1544 
 1545 int
 1546 linux_getuid(struct thread *td, struct linux_getuid_args *args)
 1547 {
 1548 
 1549 #ifdef DEBUG
 1550         if (ldebug(getuid))
 1551                 printf(ARGS(getuid, ""));
 1552 #endif
 1553 
 1554         td->td_retval[0] = td->td_ucred->cr_ruid;
 1555         return (0);
 1556 }
 1557 
 1558 
 1559 int
 1560 linux_getsid(struct thread *td, struct linux_getsid_args *args)
 1561 {
 1562         struct getsid_args bsd;
 1563 
 1564 #ifdef DEBUG
 1565         if (ldebug(getsid))
 1566                 printf(ARGS(getsid, "%i"), args->pid);
 1567 #endif
 1568 
 1569         bsd.pid = args->pid;
 1570         return getsid(td, &bsd);
 1571 }
 1572 
 1573 int
 1574 linux_nosys(struct thread *td, struct nosys_args *ignore)
 1575 {
 1576 
 1577         return (ENOSYS);
 1578 }
 1579 
 1580 int
 1581 linux_getpriority(struct thread *td, struct linux_getpriority_args *args)
 1582 {
 1583         struct getpriority_args bsd_args;
 1584         int error;
 1585 
 1586 #ifdef DEBUG
 1587         if (ldebug(getpriority))
 1588                 printf(ARGS(getpriority, "%i, %i"), args->which, args->who);
 1589 #endif
 1590 
 1591         bsd_args.which = args->which;
 1592         bsd_args.who = args->who;
 1593         error = getpriority(td, &bsd_args);
 1594         td->td_retval[0] = 20 - td->td_retval[0];
 1595         return error;
 1596 }
 1597 
 1598 int
 1599 linux_sethostname(struct thread *td, struct linux_sethostname_args *args)
 1600 {
 1601         int name[2];
 1602 
 1603 #ifdef DEBUG
 1604         if (ldebug(sethostname))
 1605                 printf(ARGS(sethostname, "*, %i"), args->len);
 1606 #endif
 1607 
 1608         name[0] = CTL_KERN;
 1609         name[1] = KERN_HOSTNAME;
 1610         return (userland_sysctl(td, name, 2, 0, 0, 0, args->hostname,
 1611             args->len, 0, 0));
 1612 }
 1613 
 1614 int
 1615 linux_exit_group(struct thread *td, struct linux_exit_group_args *args)
 1616 {
 1617         struct linux_emuldata *em, *td_em, *tmp_em;
 1618         struct proc *sp;
 1619 
 1620 #ifdef DEBUG
 1621         if (ldebug(exit_group))
 1622                 printf(ARGS(exit_group, "%i"), args->error_code);
 1623 #endif
 1624 
 1625         if (linux_use26(td)) {
 1626                 td_em = em_find(td->td_proc, EMUL_DONTLOCK);
 1627 
 1628                 KASSERT(td_em != NULL, ("exit_group: emuldata not found.\n"));
 1629 
 1630                 EMUL_SHARED_RLOCK(&emul_shared_lock);
 1631                 LIST_FOREACH_SAFE(em, &td_em->shared->threads, threads, tmp_em) {
 1632                         if (em->pid == td_em->pid)
 1633                                 continue;
 1634 
 1635                         sp = pfind(em->pid);
 1636                         psignal(sp, SIGKILL);
 1637                         PROC_UNLOCK(sp);
 1638 #ifdef DEBUG
 1639                         printf(LMSG("linux_sys_exit_group: kill PID %d\n"), em->pid);
 1640 #endif
 1641                 }
 1642 
 1643                 EMUL_SHARED_RUNLOCK(&emul_shared_lock);
 1644         }
 1645         /*
 1646          * XXX: we should send a signal to the parent if
 1647          * SIGNAL_EXIT_GROUP is set. We ignore that (temporarily?)
 1648          * as it doesnt occur often.
 1649          */
 1650         exit1(td, W_EXITCODE(args->error_code, 0));
 1651 
 1652         return (0);
 1653 }
 1654 
 1655 int
 1656 linux_prctl(struct thread *td, struct linux_prctl_args *args)
 1657 {
 1658         int error = 0, max_size;
 1659         struct proc *p = td->td_proc;
 1660         char comm[LINUX_MAX_COMM_LEN];
 1661         struct linux_emuldata *em;
 1662         int pdeath_signal;
 1663 
 1664 #ifdef DEBUG
 1665         if (ldebug(prctl))
 1666                 printf(ARGS(prctl, "%d, %d, %d, %d, %d"), args->option,
 1667                     args->arg2, args->arg3, args->arg4, args->arg5);
 1668 #endif
 1669 
 1670         switch (args->option) {
 1671         case LINUX_PR_SET_PDEATHSIG:
 1672                 if (!LINUX_SIG_VALID(args->arg2))
 1673                         return (EINVAL);
 1674                 em = em_find(p, EMUL_DOLOCK);
 1675                 KASSERT(em != NULL, ("prctl: emuldata not found.\n"));
 1676                 em->pdeath_signal = args->arg2;
 1677                 EMUL_UNLOCK(&emul_lock);
 1678                 break;
 1679         case LINUX_PR_GET_PDEATHSIG:
 1680                 em = em_find(p, EMUL_DOLOCK);
 1681                 KASSERT(em != NULL, ("prctl: emuldata not found.\n"));
 1682                 pdeath_signal = em->pdeath_signal;
 1683                 EMUL_UNLOCK(&emul_lock);
 1684                 error = copyout(&pdeath_signal,
 1685                     (void *)(register_t)args->arg2,
 1686                     sizeof(pdeath_signal));
 1687                 break;
 1688         case LINUX_PR_SET_NAME:
 1689                 /*
 1690                  * To be on the safe side we need to make sure to not
 1691                  * overflow the size a linux program expects. We already
 1692                  * do this here in the copyin, so that we don't need to
 1693                  * check on copyout.
 1694                  */
 1695                 max_size = MIN(sizeof(comm), sizeof(p->p_comm));
 1696                 error = copyinstr((void *)(register_t)args->arg2, comm,
 1697                     max_size, NULL);
 1698 
 1699                 /* Linux silently truncates the name if it is too long. */
 1700                 if (error == ENAMETOOLONG) {
 1701                         /*
 1702                          * XXX: copyinstr() isn't documented to populate the
 1703                          * array completely, so do a copyin() to be on the
 1704                          * safe side. This should be changed in case
 1705                          * copyinstr() is changed to guarantee this.
 1706                          */
 1707                         error = copyin((void *)(register_t)args->arg2, comm,
 1708                             max_size - 1);
 1709                         comm[max_size - 1] = '\0';
 1710                 }
 1711                 if (error)
 1712                         return (error);
 1713 
 1714                 PROC_LOCK(p);
 1715                 strlcpy(p->p_comm, comm, sizeof(p->p_comm));
 1716                 PROC_UNLOCK(p);
 1717                 break;
 1718         case LINUX_PR_GET_NAME:
 1719                 PROC_LOCK(p);
 1720                 strlcpy(comm, p->p_comm, sizeof(comm));
 1721                 PROC_UNLOCK(p);
 1722                 error = copyout(comm, (void *)(register_t)args->arg2,
 1723                     strlen(comm) + 1);
 1724                 break;
 1725         default:
 1726                 error = EINVAL;
 1727                 break;
 1728         }
 1729 
 1730         return (error);
 1731 }
 1732 
 1733 /*
 1734  * Get affinity of a process.
 1735  */
 1736 int
 1737 linux_sched_getaffinity(struct thread *td,
 1738     struct linux_sched_getaffinity_args *args)
 1739 {
 1740         int error;
 1741         struct cpuset_getaffinity_args cga;
 1742 
 1743 #ifdef DEBUG
 1744         if (ldebug(sched_getaffinity))
 1745                 printf(ARGS(sched_getaffinity, "%d, %d, *"), args->pid,
 1746                     args->len);
 1747 #endif
 1748         if (args->len < sizeof(cpuset_t))
 1749                 return (EINVAL);
 1750 
 1751         cga.level = CPU_LEVEL_WHICH;
 1752         cga.which = CPU_WHICH_PID;
 1753         cga.id = args->pid;
 1754         cga.cpusetsize = sizeof(cpuset_t);
 1755         cga.mask = (cpuset_t *) args->user_mask_ptr;
 1756 
 1757         if ((error = cpuset_getaffinity(td, &cga)) == 0)
 1758                 td->td_retval[0] = sizeof(cpuset_t);
 1759 
 1760         return (error);
 1761 }
 1762 
 1763 /*
 1764  *  Set affinity of a process.
 1765  */
 1766 int
 1767 linux_sched_setaffinity(struct thread *td,
 1768     struct linux_sched_setaffinity_args *args)
 1769 {
 1770         struct cpuset_setaffinity_args csa;
 1771 
 1772 #ifdef DEBUG
 1773         if (ldebug(sched_setaffinity))
 1774                 printf(ARGS(sched_setaffinity, "%d, %d, *"), args->pid,
 1775                     args->len);
 1776 #endif
 1777         if (args->len < sizeof(cpuset_t))
 1778                 return (EINVAL);
 1779 
 1780         csa.level = CPU_LEVEL_WHICH;
 1781         csa.which = CPU_WHICH_PID;
 1782         csa.id = args->pid;
 1783         csa.cpusetsize = sizeof(cpuset_t);
 1784         csa.mask = (cpuset_t *) args->user_mask_ptr;
 1785 
 1786         return (cpuset_setaffinity(td, &csa));
 1787 }

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