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rump.c revision 1.140 
      1 /*	$NetBSD: rump.c,v 1.140 2009/11/26 20:58:51 pooka Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2007 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Development of this software was supported by Google Summer of Code.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     18  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     23  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 __KERNEL_RCSID(0, "$NetBSD: rump.c,v 1.140 2009/11/26 20:58:51 pooka Exp $");
     32 
     33 #include <sys/param.h>
     34 #include <sys/atomic.h>
     35 #include <sys/buf.h>
     36 #include <sys/callout.h>
     37 #include <sys/conf.h>
     38 #include <sys/cpu.h>
     39 #include <sys/evcnt.h>
     40 #include <sys/event.h>
     41 #include <sys/exec_elf.h>
     42 #include <sys/filedesc.h>
     43 #include <sys/iostat.h>
     44 #include <sys/kauth.h>
     45 #include <sys/kernel.h>
     46 #include <sys/kmem.h>
     47 #include <sys/kprintf.h>
     48 #include <sys/ksyms.h>
     49 #include <sys/msgbuf.h>
     50 #include <sys/module.h>
     51 #include <sys/once.h>
     52 #include <sys/percpu.h>
     53 #include <sys/pipe.h>
     54 #include <sys/queue.h>
     55 #include <sys/reboot.h>
     56 #include <sys/resourcevar.h>
     57 #include <sys/select.h>
     58 #include <sys/sysctl.h>
     59 #include <sys/syscall.h>
     60 #include <sys/tty.h>
     61 #include <sys/uidinfo.h>
     62 #include <sys/vmem.h>
     63 
     64 #include <rump/rumpuser.h>
     65 
     66 #include <secmodel/suser/suser.h>
     67 
     68 #include <prop/proplib.h>
     69 
     70 #include <uvm/uvm_readahead.h>
     71 
     72 #include "rump_private.h"
     73 #include "rump_net_private.h"
     74 #include "rump_vfs_private.h"
     75 #include "rump_dev_private.h"
     76 
     77 struct proc proc0;
     78 struct session rump_session = {
     79 	.s_count = 1,
     80 	.s_flags = 0,
     81 	.s_leader = &proc0,
     82 	.s_login = "rumphobo",
     83 	.s_sid = 0,
     84 };
     85 struct pgrp rump_pgrp = {
     86 	.pg_members = LIST_HEAD_INITIALIZER(pg_members),
     87 	.pg_session = &rump_session,
     88 	.pg_jobc = 1,
     89 };
     90 struct pstats rump_stats;
     91 struct plimit rump_limits;
     92 struct filedesc rump_filedesc0;
     93 struct proclist allproc;
     94 char machine[] = "rump";
     95 static kauth_cred_t rump_susercred;
     96 
     97 /* pretend the master rump proc is init */
     98 struct proc *initproc = &proc0;
     99 
    100 struct rumpuser_mtx *rump_giantlock;
    101 
    102 sigset_t sigcantmask;
    103 
    104 #ifdef RUMP_WITHOUT_THREADS
    105 int rump_threads = 0;
    106 #else
    107 int rump_threads = 1;
    108 #endif
    109 
    110 static void
    111 rump_aiodone_worker(struct work *wk, void *dummy)
    112 {
    113 	struct buf *bp = (struct buf *)wk;
    114 
    115 	KASSERT(&bp->b_work == wk);
    116 	bp->b_iodone(bp);
    117 }
    118 
    119 static int rump_inited;
    120 static struct emul emul_rump;
    121 
    122 int rump__unavailable(void);
    123 int rump__unavailable() {return EOPNOTSUPP;}
    124 __weak_alias(rump_net_init,rump__unavailable);
    125 __weak_alias(rump_vfs_init,rump__unavailable);
    126 __weak_alias(rump_vfs_init2,rump__unavailable);
    127 __weak_alias(rump_dev_init,rump__unavailable);
    128 
    129 __weak_alias(rump_vfs_fini,rump__unavailable);
    130 
    131 __weak_alias(biodone,rump__unavailable);
    132 __weak_alias(sopoll,rump__unavailable);
    133 
    134 void rump__unavailable_vfs_panic(void);
    135 void rump__unavailable_vfs_panic() {panic("vfs component not available");}
    136 __weak_alias(vn_open,rump__unavailable_vfs_panic);
    137 __weak_alias(vn_rdwr,rump__unavailable_vfs_panic);
    138 __weak_alias(vn_stat,rump__unavailable_vfs_panic);
    139 __weak_alias(vn_close,rump__unavailable_vfs_panic);
    140 __weak_alias(namei,rump__unavailable_vfs_panic);
    141 __weak_alias(usermount_common_policy,rump__unavailable_vfs_panic);
    142 
    143 static void
    144 pvfsinit_nop(struct proc *p)
    145 {
    146 
    147 	return;
    148 }
    149 
    150 static void
    151 pvfsrele_nop(struct proc *p)
    152 {
    153 
    154 	return;
    155 }
    156 
    157 rump_proc_vfs_init_fn rump_proc_vfs_init = pvfsinit_nop;
    158 rump_proc_vfs_release_fn rump_proc_vfs_release = pvfsrele_nop;
    159 
    160 /*
    161  * Stir up the stack a bit.  These are exported functions to help
    162  * convince the compiler that we don't want these routines completely
    163  * optimized out or inlined.  Is there an easier way to do this?
    164  */
    165 void nullfn(uint32_t *);
    166 void nullfn(uint32_t *arg){}
    167 void messthestack(void);
    168 void
    169 messthestack(void)
    170 {
    171 	uint32_t mess[64];
    172 	uint64_t d1, d2;
    173 	int i, error;
    174 
    175 	for (i = 0; i < 64; i++) {
    176 		rumpuser_gettime(&d1, &d2, &error);
    177 		mess[i] = d2;
    178 	}
    179 	nullfn(mess);
    180 }
    181 
    182 int
    183 rump__init(int rump_version)
    184 {
    185 	char buf[256];
    186 	struct proc *p;
    187 	struct lwp *l;
    188 	int error;
    189 
    190 	/* not reentrant */
    191 	if (rump_inited)
    192 		return 0;
    193 	else if (rump_inited == -1)
    194 		panic("rump_init: host process restart required");
    195 	else
    196 		rump_inited = 1;
    197 
    198 	/*
    199 	 * Seed arc4random() with a "reasonable" amount of randomness.
    200 	 * Yes, this is a quick kludge which depends on the arc4random
    201 	 * implementation.
    202 	 */
    203 	messthestack();
    204 	arc4random();
    205 
    206 	if (rump_version != RUMP_VERSION) {
    207 		printf("rump version mismatch, %d vs. %d\n",
    208 		    rump_version, RUMP_VERSION);
    209 		return EPROGMISMATCH;
    210 	}
    211 
    212 	if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) {
    213 		rump_threads = *buf != '0';
    214 	}
    215 	rumpuser_thrinit(rump_user_schedule, rump_user_unschedule,
    216 	    rump_threads);
    217 
    218 	/* init minimal lwp/cpu context */
    219 	l = &lwp0;
    220 	l->l_lid = 1;
    221 	l->l_cpu = rump_cpu;
    222 	rumpuser_set_curlwp(l);
    223 
    224 	mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_NONE);
    225 	rumpuser_mutex_recursive_init(&rump_giantlock);
    226 	ksyms_init();
    227 	rumpvm_init();
    228 	evcnt_init();
    229 
    230 	once_init();
    231 	prop_kern_init();
    232 
    233 	rump_sleepers_init();
    234 
    235 	pool_subsystem_init();
    236 	kmem_init();
    237 
    238 	uvm_ra_init();
    239 
    240 	mutex_obj_init();
    241 
    242 	kprintf_init();
    243 	loginit();
    244 
    245 	kauth_init();
    246 	rump_susercred = rump_cred_create(0, 0, 0, NULL);
    247 
    248 	/* init proc0 and rest of lwp0 now that we can allocate memory */
    249 	p = &proc0;
    250 	p->p_stats = &rump_stats;
    251 	p->p_limit = &rump_limits;
    252 	p->p_pgrp = &rump_pgrp;
    253 	p->p_pid = 0;
    254 	p->p_fd = &rump_filedesc0;
    255 	p->p_vmspace = &rump_vmspace;
    256 	p->p_emul = &emul_rump;
    257 	p->p_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    258 	l->l_cred = rump_cred_suserget();
    259 	l->l_proc = p;
    260 	LIST_INIT(&allproc);
    261 	LIST_INSERT_HEAD(&allproc, &proc0, p_list);
    262 	proc_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    263 
    264 	rump_limits.pl_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
    265 	rump_limits.pl_rlimit[RLIMIT_NOFILE].rlim_cur = RLIM_INFINITY;
    266 	rump_limits.pl_rlimit[RLIMIT_SBSIZE].rlim_cur = RLIM_INFINITY;
    267 
    268 	rump_scheduler_init();
    269 	/* revert temporary context and schedule a real context */
    270 	l->l_cpu = NULL;
    271 	rumpuser_set_curlwp(NULL);
    272 	rump_schedule();
    273 
    274 	callout_startup();
    275 	callout_init_cpu(rump_cpu);
    276 	selsysinit(rump_cpu);
    277 
    278 	sysctl_init();
    279 	kqueue_init();
    280 	iostat_init();
    281 	uid_init();
    282 	percpu_init();
    283 	fd_sys_init();
    284 	module_init();
    285 	softint_init(rump_cpu);
    286 	devsw_init();
    287 	pipe_init();
    288 
    289 	/* these do nothing if not present */
    290 	rump_vfs_init();
    291 	rump_net_init();
    292 	rump_dev_init();
    293 	cold = 0;
    294 
    295 	/* aieeeedondest */
    296 	if (rump_threads) {
    297 		if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
    298 		    rump_aiodone_worker, NULL, 0, 0, WQ_MPSAFE))
    299 			panic("aiodoned");
    300 	}
    301 
    302 	sysctl_finalize();
    303 
    304 	rumpuser_dl_module_bootstrap(rump_module_init, rump_kernelfsym_load);
    305 
    306 	/* mount rootfs, etcetc. */
    307 	rump_vfs_init2();
    308 
    309 	rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error);
    310 	hostnamelen = strlen(hostname);
    311 
    312 	sigemptyset(&sigcantmask);
    313 
    314 	lwp0.l_fd = proc0.p_fd = fd_init(&rump_filedesc0);
    315 
    316 #ifdef RUMP_USE_REAL_ALLOCATORS
    317 	if (rump_threads)
    318 		vmem_rehash_start();
    319 #endif
    320 
    321 	rump_unschedule();
    322 
    323 	return 0;
    324 }
    325 
    326 /* maybe support sys_reboot some day for remote shutdown */
    327 void
    328 rump_reboot(int howto)
    329 {
    330 
    331 	/* dump means we really take the dive here */
    332 	if ((howto & RB_DUMP) || panicstr) {
    333 		rumpuser_exit(RUMPUSER_PANIC);
    334 		/*NOTREACHED*/
    335 	}
    336 
    337 	/* try to sync */
    338 	if (!((howto & RB_NOSYNC) || panicstr)) {
    339 		rump_vfs_fini();
    340 	}
    341 
    342 	/* your wish is my command */
    343 	if (howto & RB_HALT) {
    344 		for (;;) {
    345 			uint64_t sec = 5, nsec = 0;
    346 			int error;
    347 
    348 			rumpuser_nanosleep(&sec, &nsec, &error);
    349 		}
    350 	}
    351 	rump_inited = -1;
    352 }
    353 
    354 struct uio *
    355 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
    356 {
    357 	struct uio *uio;
    358 	enum uio_rw uiorw;
    359 
    360 	switch (rw) {
    361 	case RUMPUIO_READ:
    362 		uiorw = UIO_READ;
    363 		break;
    364 	case RUMPUIO_WRITE:
    365 		uiorw = UIO_WRITE;
    366 		break;
    367 	default:
    368 		panic("%s: invalid rw %d", __func__, rw);
    369 	}
    370 
    371 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
    372 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
    373 
    374 	uio->uio_iov->iov_base = buf;
    375 	uio->uio_iov->iov_len = bufsize;
    376 
    377 	uio->uio_iovcnt = 1;
    378 	uio->uio_offset = offset;
    379 	uio->uio_resid = bufsize;
    380 	uio->uio_rw = uiorw;
    381 	uio->uio_vmspace = UIO_VMSPACE_SYS;
    382 
    383 	return uio;
    384 }
    385 
    386 size_t
    387 rump_uio_getresid(struct uio *uio)
    388 {
    389 
    390 	return uio->uio_resid;
    391 }
    392 
    393 off_t
    394 rump_uio_getoff(struct uio *uio)
    395 {
    396 
    397 	return uio->uio_offset;
    398 }
    399 
    400 size_t
    401 rump_uio_free(struct uio *uio)
    402 {
    403 	size_t resid;
    404 
    405 	resid = uio->uio_resid;
    406 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
    407 	kmem_free(uio, sizeof(*uio));
    408 
    409 	return resid;
    410 }
    411 
    412 static pid_t nextpid = 1;
    413 struct lwp *
    414 rump_newproc_switch()
    415 {
    416 	struct lwp *l;
    417 	pid_t mypid;
    418 
    419 	mypid = atomic_inc_uint_nv(&nextpid);
    420 	if (__predict_false(mypid == 0))
    421 		mypid = atomic_inc_uint_nv(&nextpid);
    422 
    423 	l = rump_lwp_alloc(mypid, 0);
    424 	rump_lwp_switch(l);
    425 
    426 	return l;
    427 }
    428 
    429 struct lwp *
    430 rump_lwp_alloc_and_switch(pid_t pid, lwpid_t lid)
    431 {
    432 	struct lwp *l;
    433 
    434 	l = rump_lwp_alloc(pid, lid);
    435 	rump_lwp_switch(l);
    436 
    437 	return l;
    438 }
    439 
    440 struct lwp *
    441 rump_lwp_alloc(pid_t pid, lwpid_t lid)
    442 {
    443 	struct lwp *l;
    444 	struct proc *p;
    445 
    446 	l = kmem_zalloc(sizeof(*l), KM_SLEEP);
    447 	if (pid != 0) {
    448 		p = kmem_zalloc(sizeof(*p), KM_SLEEP);
    449 		rump_proc_vfs_init(p);
    450 		p->p_stats = &rump_stats;
    451 		p->p_limit = &rump_limits;
    452 		p->p_pid = pid;
    453 		p->p_vmspace = &rump_vmspace;
    454 		p->p_fd = fd_init(NULL);
    455 		p->p_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    456 		l->l_cred = rump_cred_suserget();
    457 	} else {
    458 		p = &proc0;
    459 		l->l_cred = rump_susercred;
    460 	}
    461 
    462 	l->l_proc = p;
    463 	l->l_lid = lid;
    464 	l->l_fd = p->p_fd;
    465 	l->l_cpu = NULL;
    466 
    467 	return l;
    468 }
    469 
    470 void
    471 rump_lwp_switch(struct lwp *newlwp)
    472 {
    473 	struct lwp *l = curlwp;
    474 
    475 	rumpuser_set_curlwp(NULL);
    476 	newlwp->l_cpu = l->l_cpu;
    477 	newlwp->l_mutex = l->l_mutex;
    478 	l->l_mutex = NULL;
    479 	l->l_cpu = NULL;
    480 	rumpuser_set_curlwp(newlwp);
    481 	if (l->l_flag & LW_WEXIT)
    482 		rump_lwp_free(l);
    483 }
    484 
    485 /* XXX: this has effect only on non-pid0 lwps */
    486 void
    487 rump_lwp_release(struct lwp *l)
    488 {
    489 	struct proc *p;
    490 
    491 	p = l->l_proc;
    492 	if (p->p_pid != 0) {
    493 		mutex_obj_free(p->p_lock);
    494 		fd_free();
    495 		rump_proc_vfs_release(p);
    496 		rump_cred_put(l->l_cred);
    497 		kmem_free(p, sizeof(*p));
    498 	}
    499 	KASSERT((l->l_flag & LW_WEXIT) == 0);
    500 	l->l_flag |= LW_WEXIT;
    501 }
    502 
    503 void
    504 rump_lwp_free(struct lwp *l)
    505 {
    506 
    507 	KASSERT(l->l_flag & LW_WEXIT);
    508 	KASSERT(l->l_mutex == NULL);
    509 	kmem_free(l, sizeof(*l));
    510 }
    511 
    512 struct lwp *
    513 rump_lwp_curlwp(void)
    514 {
    515 	struct lwp *l = curlwp;
    516 
    517 	if (l->l_flag & LW_WEXIT)
    518 		return NULL;
    519 	return l;
    520 }
    521 
    522 /* rump private.  NEEDS WORK! */
    523 void
    524 rump_set_vmspace(struct vmspace *vm)
    525 {
    526 	struct proc *p = curproc;
    527 
    528 	p->p_vmspace = vm;
    529 }
    530 
    531 kauth_cred_t
    532 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
    533 {
    534 	kauth_cred_t cred;
    535 	int rv;
    536 
    537 	cred = kauth_cred_alloc();
    538 	kauth_cred_setuid(cred, uid);
    539 	kauth_cred_seteuid(cred, uid);
    540 	kauth_cred_setsvuid(cred, uid);
    541 	kauth_cred_setgid(cred, gid);
    542 	kauth_cred_setgid(cred, gid);
    543 	kauth_cred_setegid(cred, gid);
    544 	kauth_cred_setsvgid(cred, gid);
    545 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
    546 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
    547 	assert(rv == 0);
    548 
    549 	return cred;
    550 }
    551 
    552 void
    553 rump_cred_put(kauth_cred_t cred)
    554 {
    555 
    556 	kauth_cred_free(cred);
    557 }
    558 
    559 kauth_cred_t
    560 rump_cred_suserget(void)
    561 {
    562 
    563 	kauth_cred_hold(rump_susercred);
    564 	return rump_susercred;
    565 }
    566 
    567 /*
    568  * Return the next system lwpid
    569  */
    570 lwpid_t
    571 rump_nextlid(void)
    572 {
    573 	lwpid_t retid;
    574 
    575 	mutex_enter(proc0.p_lock);
    576 	/*
    577 	 * Take next one, don't return 0
    578 	 * XXX: most likely we'll have collisions in case this
    579 	 * wraps around.
    580 	 */
    581 	if (++proc0.p_nlwpid == 0)
    582 		++proc0.p_nlwpid;
    583 	retid = proc0.p_nlwpid;
    584 	mutex_exit(proc0.p_lock);
    585 
    586 	return retid;
    587 }
    588 
    589 #define ERROUT(err) do { rv = err; goto out; } while (/*CONSTCOND*/0)
    590 int
    591 rump_module_init(struct modinfo *mi, prop_dictionary_t props)
    592 {
    593 	struct module *mod;
    594 	int rv;
    595 
    596 	/* module_dummy */
    597 	if (mi->mi_name == NULL)
    598 		return EINVAL;
    599 
    600 	mutex_enter(&module_lock);
    601 	if (module_lookup(mi->mi_name))
    602 		ERROUT(EEXIST);
    603 
    604 	if (!module_compatible(mi->mi_version, __NetBSD_Version__))
    605 		ERROUT(EPROGMISMATCH);
    606 
    607 	rv = mi->mi_modcmd(MODULE_CMD_INIT, props);
    608 	if (rv == 0) {
    609 		mod = kmem_zalloc(sizeof(*mod), KM_SLEEP);
    610 		mod->mod_info = mi;
    611 		module_enqueue(mod);
    612 		if (mi->mi_class == MODULE_CLASS_SECMODEL)
    613 			secmodel_register();
    614 	}
    615 
    616  out:
    617 	mutex_exit(&module_lock);
    618 	return rv;
    619 }
    620 
    621 int
    622 rump_module_fini(struct modinfo *mi)
    623 {
    624 	int rv;
    625 
    626 	rv = mi->mi_modcmd(MODULE_CMD_FINI, NULL);
    627 	if (rv == 0 && mi->mi_class == MODULE_CLASS_SECMODEL)
    628 		secmodel_deregister();
    629 
    630 	return rv;
    631 }
    632 
    633 int
    634 rump_kernelfsym_load(void *symtab, uint64_t symsize,
    635 	char *strtab, uint64_t strsize)
    636 {
    637 	static int inited = 0;
    638 	Elf64_Ehdr ehdr;
    639 
    640 	if (inited)
    641 		return EBUSY;
    642 	inited = 1;
    643 
    644 	/*
    645 	 * Use 64bit header since it's bigger.  Shouldn't make a
    646 	 * difference, since we're passing in all zeroes anyway.
    647 	 */
    648 	memset(&ehdr, 0, sizeof(ehdr));
    649 	ksyms_addsyms_explicit(&ehdr, symtab, symsize, strtab, strsize);
    650 
    651 	return 0;
    652 }
    653 
    654 static int
    655 rump_sysproxy_local(int num, void *arg, uint8_t *data, size_t dlen,
    656 	register_t *retval)
    657 {
    658 	struct lwp *l;
    659 	struct sysent *callp;
    660 	int rv;
    661 
    662 	if (__predict_false(num >= SYS_NSYSENT))
    663 		return ENOSYS;
    664 
    665 	callp = rump_sysent + num;
    666 	rump_schedule();
    667 	l = curlwp;
    668 	rv = callp->sy_call(l, (void *)data, retval);
    669 	rump_unschedule();
    670 
    671 	return rv;
    672 }
    673 
    674 int
    675 rump_boot_gethowto()
    676 {
    677 
    678 	return boothowto;
    679 }
    680 
    681 void
    682 rump_boot_sethowto(int howto)
    683 {
    684 
    685 	boothowto = howto;
    686 }
    687 
    688 rump_sysproxy_t rump_sysproxy = rump_sysproxy_local;
    689 void *rump_sysproxy_arg;
    690 
    691 /*
    692  * This whole syscall-via-rpc is still taking form.  For example, it
    693  * may be necessary to set syscalls individually instead of lobbing
    694  * them all to the same place.  So don't think this interface is
    695  * set in stone.
    696  */
    697 int
    698 rump_sysproxy_set(rump_sysproxy_t proxy, void *arg)
    699 {
    700 
    701 	if (rump_sysproxy_arg)
    702 		return EBUSY;
    703 
    704 	rump_sysproxy_arg = arg;
    705 	rump_sysproxy = proxy;
    706 
    707 	return 0;
    708 }
    709 
    710 int
    711 rump_getversion(void)
    712 {
    713 
    714 	return __NetBSD_Version__;
    715 }
    716