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rump.c revision 1.185 
      1 /*	$NetBSD: rump.c,v 1.185 2010/09/06 20:10:20 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 1.185 2010/09/06 20:10:20 pooka Exp $");
     32 
     33 #include <sys/systm.h>
     34 #define ELFSIZE ARCH_ELFSIZE
     35 
     36 #include <sys/param.h>
     37 #include <sys/atomic.h>
     38 #include <sys/buf.h>
     39 #include <sys/callout.h>
     40 #include <sys/conf.h>
     41 #include <sys/cpu.h>
     42 #include <sys/device.h>
     43 #include <sys/evcnt.h>
     44 #include <sys/event.h>
     45 #include <sys/exec_elf.h>
     46 #include <sys/filedesc.h>
     47 #include <sys/iostat.h>
     48 #include <sys/kauth.h>
     49 #include <sys/kernel.h>
     50 #include <sys/kmem.h>
     51 #include <sys/kprintf.h>
     52 #include <sys/kthread.h>
     53 #include <sys/ksyms.h>
     54 #include <sys/msgbuf.h>
     55 #include <sys/module.h>
     56 #include <sys/once.h>
     57 #include <sys/percpu.h>
     58 #include <sys/pipe.h>
     59 #include <sys/pool.h>
     60 #include <sys/queue.h>
     61 #include <sys/reboot.h>
     62 #include <sys/resourcevar.h>
     63 #include <sys/select.h>
     64 #include <sys/sysctl.h>
     65 #include <sys/syscall.h>
     66 #include <sys/syscallvar.h>
     67 #include <sys/timetc.h>
     68 #include <sys/tty.h>
     69 #include <sys/uidinfo.h>
     70 #include <sys/vmem.h>
     71 #include <sys/xcall.h>
     72 
     73 #include <rump/rumpuser.h>
     74 
     75 #include <secmodel/suser/suser.h>
     76 
     77 #include <prop/proplib.h>
     78 
     79 #include <uvm/uvm_extern.h>
     80 #include <uvm/uvm_readahead.h>
     81 
     82 #include "rump_private.h"
     83 #include "rump_net_private.h"
     84 #include "rump_vfs_private.h"
     85 #include "rump_dev_private.h"
     86 
     87 /* is this still necessary or use kern_proc stuff? */
     88 struct session rump_session = {
     89 	.s_count = 1,
     90 	.s_flags = 0,
     91 	.s_leader = &proc0,
     92 	.s_login = "rumphobo",
     93 	.s_sid = 0,
     94 };
     95 struct pgrp rump_pgrp = {
     96 	.pg_members = LIST_HEAD_INITIALIZER(pg_members),
     97 	.pg_session = &rump_session,
     98 	.pg_jobc = 1,
     99 };
    100 
    101 char machine[] = MACHINE;
    102 static kauth_cred_t rump_susercred;
    103 
    104 /* pretend the master rump proc is init */
    105 struct proc *initproc = &proc0;
    106 
    107 struct rumpuser_mtx *rump_giantlock;
    108 
    109 struct device rump_rootdev = {
    110 	.dv_class = DV_VIRTUAL
    111 };
    112 
    113 #ifdef RUMP_WITHOUT_THREADS
    114 int rump_threads = 0;
    115 #else
    116 int rump_threads = 1;
    117 #endif
    118 
    119 static char rump_msgbuf[16*1024]; /* 16k should be enough for std rump needs */
    120 
    121 static void
    122 rump_aiodone_worker(struct work *wk, void *dummy)
    123 {
    124 	struct buf *bp = (struct buf *)wk;
    125 
    126 	KASSERT(&bp->b_work == wk);
    127 	bp->b_iodone(bp);
    128 }
    129 
    130 static int rump_inited;
    131 
    132 /*
    133  * Make sure pnbuf_cache is available even without vfs
    134  */
    135 struct pool_cache *pnbuf_cache;
    136 int rump_initpnbufpool(void);
    137 int rump_initpnbufpool(void)
    138 {
    139 
    140         pnbuf_cache = pool_cache_init(MAXPATHLEN, 0, 0, 0, "pnbufpl",
    141 	    NULL, IPL_NONE, NULL, NULL, NULL);
    142 	return EOPNOTSUPP;
    143 }
    144 
    145 int rump__unavailable(void);
    146 int rump__unavailable() {return EOPNOTSUPP;}
    147 __weak_alias(rump_net_init,rump__unavailable);
    148 __weak_alias(rump_vfs_init,rump_initpnbufpool);
    149 __weak_alias(rump_dev_init,rump__unavailable);
    150 
    151 __weak_alias(rump_vfs_fini,rump__unavailable);
    152 
    153 __weak_alias(biodone,rump__unavailable);
    154 __weak_alias(sopoll,rump__unavailable);
    155 
    156 void rump__unavailable_vfs_panic(void);
    157 void rump__unavailable_vfs_panic() {panic("vfs component not available");}
    158 __weak_alias(usermount_common_policy,rump__unavailable_vfs_panic);
    159 
    160 rump_proc_vfs_init_fn rump_proc_vfs_init;
    161 rump_proc_vfs_release_fn rump_proc_vfs_release;
    162 
    163 static void add_linkedin_modules(const struct modinfo *const *, size_t);
    164 
    165 static void __noinline
    166 messthestack(void)
    167 {
    168 	volatile uint32_t mess[64];
    169 	uint64_t d1, d2;
    170 	int i, error;
    171 
    172 	for (i = 0; i < 64; i++) {
    173 		rumpuser_gettime(&d1, &d2, &error);
    174 		mess[i] = d2;
    175 	}
    176 }
    177 
    178 /*
    179  * Create kern.hostname.  why only this you ask.  well, init_sysctl
    180  * is a kitchen sink in need of some gardening.  but i want to use
    181  * kern.hostname today.
    182  */
    183 static void
    184 mksysctls(void)
    185 {
    186 
    187 	sysctl_createv(NULL, 0, NULL, NULL,
    188 	    CTLFLAG_PERMANENT, CTLTYPE_NODE, "kern", NULL,
    189 	    NULL, 0, NULL, 0, CTL_KERN, CTL_EOL);
    190 
    191 	/* XXX: setting hostnamelen is missing */
    192 	sysctl_createv(NULL, 0, NULL, NULL,
    193 	    CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRING, "hostname",
    194 	    SYSCTL_DESCR("System hostname"), NULL, 0,
    195 	    &hostname, MAXHOSTNAMELEN, CTL_KERN, KERN_HOSTNAME, CTL_EOL);
    196 }
    197 
    198 int
    199 rump__init(int rump_version)
    200 {
    201 	char buf[256];
    202 	struct timespec ts;
    203 	uint64_t sec, nsec;
    204 	struct lwp *l;
    205 	int i, numcpu;
    206 	int error;
    207 
    208 	/* not reentrant */
    209 	if (rump_inited)
    210 		return 0;
    211 	else if (rump_inited == -1)
    212 		panic("rump_init: host process restart required");
    213 	else
    214 		rump_inited = 1;
    215 
    216 	if (rumpuser_getversion() != RUMPUSER_VERSION) {
    217 		/* let's hope the ABI of rumpuser_dprintf is the same ;) */
    218 		rumpuser_dprintf("rumpuser version mismatch: %d vs. %d\n",
    219 		    rumpuser_getversion(), RUMPUSER_VERSION);
    220 		return EPROGMISMATCH;
    221 	}
    222 
    223 	if (rumpuser_getenv("RUMP_VERBOSE", buf, sizeof(buf), &error) == 0) {
    224 		if (*buf != '0')
    225 			boothowto = AB_VERBOSE;
    226 	}
    227 
    228 	if (rumpuser_getenv("RUMP_NCPU", buf, sizeof(buf), &error) == 0)
    229 		error = 0;
    230 	/* non-x86 is missing CPU_INFO_FOREACH() support */
    231 #if defined(__i386__) || defined(__x86_64__)
    232 	if (error == 0) {
    233 		numcpu = strtoll(buf, NULL, 10);
    234 		if (numcpu < 1)
    235 			numcpu = 1;
    236 	} else {
    237 		numcpu = rumpuser_getnhostcpu();
    238 	}
    239 #else
    240 	if (error == 0)
    241 		printf("NCPU limited to 1 on this host\n");
    242 	numcpu = 1;
    243 #endif
    244 	rump_cpus_bootstrap(numcpu);
    245 
    246 	rumpuser_gettime(&sec, &nsec, &error);
    247 	boottime.tv_sec = sec;
    248 	boottime.tv_nsec = nsec;
    249 
    250 	initmsgbuf(rump_msgbuf, sizeof(rump_msgbuf));
    251 	aprint_verbose("%s%s", copyright, version);
    252 
    253 	/*
    254 	 * Seed arc4random() with a "reasonable" amount of randomness.
    255 	 * Yes, this is a quick kludge which depends on the arc4random
    256 	 * implementation.
    257 	 */
    258 	messthestack();
    259 	arc4random();
    260 
    261 	if (rump_version != RUMP_VERSION) {
    262 		printf("rump version mismatch, %d vs. %d\n",
    263 		    rump_version, RUMP_VERSION);
    264 		return EPROGMISMATCH;
    265 	}
    266 
    267 	if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) {
    268 		rump_threads = *buf != '0';
    269 	}
    270 	rumpuser_thrinit(rump_user_schedule, rump_user_unschedule,
    271 	    rump_threads);
    272 	rump_intr_init();
    273 	rump_tsleep_init();
    274 
    275 	/* init minimal lwp/cpu context */
    276 	l = &lwp0;
    277 	l->l_lid = 1;
    278 	l->l_cpu = l->l_target_cpu = rump_cpu;
    279 	l->l_fd = &filedesc0;
    280 	rumpuser_set_curlwp(l);
    281 
    282 	mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_NONE);
    283 	rumpuser_mutex_recursive_init(&rump_giantlock);
    284 	ksyms_init();
    285 	uvm_init();
    286 	evcnt_init();
    287 
    288 	once_init();
    289 	kernconfig_lock_init();
    290 	prop_kern_init();
    291 
    292 	pool_subsystem_init();
    293 	kmem_init();
    294 
    295 	uvm_ra_init();
    296 	uao_init();
    297 
    298 	mutex_obj_init();
    299 	callout_startup();
    300 
    301 	kprintf_init();
    302 	loginit();
    303 
    304 	kauth_init();
    305 	rump_susercred = rump_cred_create(0, 0, 0, NULL);
    306 
    307 	procinit();
    308 	proc0_init();
    309 
    310 	l->l_proc = &proc0;
    311 	lwp_update_creds(l);
    312 
    313 	lwpinit_specificdata();
    314 	lwp_initspecific(&lwp0);
    315 
    316 	rump_scheduler_init();
    317 	/* revert temporary context and schedule a real context */
    318 	l->l_cpu = NULL;
    319 	rumpuser_set_curlwp(NULL);
    320 	rump_schedule();
    321 
    322 	percpu_init();
    323 	inittimecounter();
    324 	ntp_init();
    325 
    326 	rumpuser_gettime(&sec, &nsec, &error);
    327 	ts.tv_sec = sec;
    328 	ts.tv_nsec = nsec;
    329 	tc_setclock(&ts);
    330 
    331 	/* we are mostly go.  do per-cpu subsystem init */
    332 	for (i = 0; i < ncpu; i++) {
    333 		struct cpu_info *ci = cpu_lookup(i);
    334 
    335 		callout_init_cpu(ci);
    336 		softint_init(ci);
    337 		xc_init_cpu(ci);
    338 		pool_cache_cpu_init(ci);
    339 		selsysinit(ci);
    340 		percpu_init_cpu(ci);
    341 
    342 		aprint_verbose("cpu%d at thinair0: rump virtual cpu\n", i);
    343 	}
    344 
    345 	sysctl_init();
    346 	kqueue_init();
    347 	iostat_init();
    348 	uid_init();
    349 	fd_sys_init();
    350 	module_init();
    351 	devsw_init();
    352 	pipe_init();
    353 	resource_init();
    354 
    355 	/* start page baroness */
    356 	if (rump_threads) {
    357 		if (kthread_create(PRI_PGDAEMON, KTHREAD_MPSAFE, NULL,
    358 		    uvm_pageout, NULL, &uvm.pagedaemon_lwp, "pdaemon") != 0)
    359 			panic("pagedaemon create failed");
    360 	} else
    361 		uvm.pagedaemon_lwp = NULL; /* doesn't match curlwp */
    362 
    363 	/* process dso's */
    364 	rumpuser_dl_bootstrap(add_linkedin_modules, rump_kernelfsym_load);
    365 
    366 	rump_component_init(RUMP_COMPONENT_KERN);
    367 
    368 	/* these do nothing if not present */
    369 	rump_vfs_init();
    370 	rump_net_init();
    371 	rump_dev_init();
    372 
    373 	rump_component_init(RUMP_COMPONENT_KERN_VFS);
    374 
    375 	cold = 0;
    376 
    377 	/* aieeeedondest */
    378 	if (rump_threads) {
    379 		if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
    380 		    rump_aiodone_worker, NULL, 0, 0, WQ_MPSAFE))
    381 			panic("aiodoned");
    382 	}
    383 
    384 	mksysctls();
    385 	sysctl_finalize();
    386 
    387 	module_init_class(MODULE_CLASS_ANY);
    388 
    389 	rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error);
    390 	hostnamelen = strlen(hostname);
    391 
    392 	sigemptyset(&sigcantmask);
    393 
    394 	if (rump_threads)
    395 		vmem_rehash_start();
    396 
    397 	rump_unschedule();
    398 
    399 	return 0;
    400 }
    401 
    402 /* maybe support sys_reboot some day for remote shutdown */
    403 void
    404 rump_reboot(int howto)
    405 {
    406 
    407 	/* dump means we really take the dive here */
    408 	if ((howto & RB_DUMP) || panicstr) {
    409 		rumpuser_exit(RUMPUSER_PANIC);
    410 		/*NOTREACHED*/
    411 	}
    412 
    413 	/* try to sync */
    414 	if (!((howto & RB_NOSYNC) || panicstr)) {
    415 		rump_vfs_fini();
    416 	}
    417 
    418 	/* your wish is my command */
    419 	if (howto & RB_HALT) {
    420 		for (;;) {
    421 			uint64_t sec = 5, nsec = 0;
    422 			int error;
    423 
    424 			rumpuser_nanosleep(&sec, &nsec, &error);
    425 		}
    426 	}
    427 	rump_inited = -1;
    428 }
    429 
    430 struct uio *
    431 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
    432 {
    433 	struct uio *uio;
    434 	enum uio_rw uiorw;
    435 
    436 	switch (rw) {
    437 	case RUMPUIO_READ:
    438 		uiorw = UIO_READ;
    439 		break;
    440 	case RUMPUIO_WRITE:
    441 		uiorw = UIO_WRITE;
    442 		break;
    443 	default:
    444 		panic("%s: invalid rw %d", __func__, rw);
    445 	}
    446 
    447 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
    448 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
    449 
    450 	uio->uio_iov->iov_base = buf;
    451 	uio->uio_iov->iov_len = bufsize;
    452 
    453 	uio->uio_iovcnt = 1;
    454 	uio->uio_offset = offset;
    455 	uio->uio_resid = bufsize;
    456 	uio->uio_rw = uiorw;
    457 	uio->uio_vmspace = UIO_VMSPACE_SYS;
    458 
    459 	return uio;
    460 }
    461 
    462 size_t
    463 rump_uio_getresid(struct uio *uio)
    464 {
    465 
    466 	return uio->uio_resid;
    467 }
    468 
    469 off_t
    470 rump_uio_getoff(struct uio *uio)
    471 {
    472 
    473 	return uio->uio_offset;
    474 }
    475 
    476 size_t
    477 rump_uio_free(struct uio *uio)
    478 {
    479 	size_t resid;
    480 
    481 	resid = uio->uio_resid;
    482 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
    483 	kmem_free(uio, sizeof(*uio));
    484 
    485 	return resid;
    486 }
    487 
    488 /* rump private.  NEEDS WORK! */
    489 void
    490 rump_set_vmspace(struct vmspace *vm)
    491 {
    492 	struct proc *p = curproc;
    493 
    494 	p->p_vmspace = vm;
    495 }
    496 
    497 kauth_cred_t
    498 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
    499 {
    500 	kauth_cred_t cred;
    501 	int rv;
    502 
    503 	cred = kauth_cred_alloc();
    504 	kauth_cred_setuid(cred, uid);
    505 	kauth_cred_seteuid(cred, uid);
    506 	kauth_cred_setsvuid(cred, uid);
    507 	kauth_cred_setgid(cred, gid);
    508 	kauth_cred_setgid(cred, gid);
    509 	kauth_cred_setegid(cred, gid);
    510 	kauth_cred_setsvgid(cred, gid);
    511 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
    512 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
    513 	assert(rv == 0);
    514 
    515 	return cred;
    516 }
    517 
    518 void
    519 rump_cred_put(kauth_cred_t cred)
    520 {
    521 
    522 	kauth_cred_free(cred);
    523 }
    524 
    525 static int compcounter[RUMP_COMPONENT_MAX];
    526 
    527 static void
    528 rump_component_init_cb(struct rump_component *rc, int type)
    529 {
    530 
    531 	KASSERT(type < RUMP_COMPONENT_MAX);
    532 	if (rc->rc_type == type) {
    533 		rc->rc_init();
    534 		compcounter[type]++;
    535 	}
    536 }
    537 
    538 int
    539 rump_component_count(enum rump_component_type type)
    540 {
    541 
    542 	KASSERT(type <= RUMP_COMPONENT_MAX);
    543 	return compcounter[type];
    544 }
    545 
    546 void
    547 rump_component_init(enum rump_component_type type)
    548 {
    549 
    550 	rumpuser_dl_component_init(type, rump_component_init_cb);
    551 }
    552 
    553 /*
    554  * Initialize a module which has already been loaded and linked
    555  * with dlopen(). This is fundamentally the same as a builtin module.
    556  */
    557 int
    558 rump_module_init(const struct modinfo * const *mip, size_t nmodinfo)
    559 {
    560 
    561 	return module_builtin_add(mip, nmodinfo, true);
    562 }
    563 
    564 /*
    565  * Finish module (flawless victory, fatality!).
    566  */
    567 int
    568 rump_module_fini(const struct modinfo *mi)
    569 {
    570 
    571 	return module_builtin_remove(mi, true);
    572 }
    573 
    574 /*
    575  * Add loaded and linked module to the builtin list.  It will
    576  * later be initialized with module_init_class().
    577  */
    578 
    579 static void
    580 add_linkedin_modules(const struct modinfo * const *mip, size_t nmodinfo)
    581 {
    582 
    583 	module_builtin_add(mip, nmodinfo, false);
    584 }
    585 
    586 int
    587 rump_kernelfsym_load(void *symtab, uint64_t symsize,
    588 	char *strtab, uint64_t strsize)
    589 {
    590 	static int inited = 0;
    591 	Elf64_Ehdr ehdr;
    592 
    593 	if (inited)
    594 		return EBUSY;
    595 	inited = 1;
    596 
    597 	/*
    598 	 * Use 64bit header since it's bigger.  Shouldn't make a
    599 	 * difference, since we're passing in all zeroes anyway.
    600 	 */
    601 	memset(&ehdr, 0, sizeof(ehdr));
    602 	ksyms_addsyms_explicit(&ehdr, symtab, symsize, strtab, strsize);
    603 
    604 	return 0;
    605 }
    606 
    607 static int
    608 rump_sysproxy_local(int num, void *arg, uint8_t *data, size_t dlen,
    609 	register_t *retval)
    610 {
    611 	struct lwp *l;
    612 	struct sysent *callp;
    613 	int rv;
    614 
    615 	if (__predict_false(num >= SYS_NSYSENT))
    616 		return ENOSYS;
    617 
    618 	callp = rump_sysent + num;
    619 	rump_schedule();
    620 	l = curlwp;
    621 	rv = sy_call(callp, l, (void *)data, retval);
    622 	rump_unschedule();
    623 
    624 	return rv;
    625 }
    626 
    627 int
    628 rump_boot_gethowto()
    629 {
    630 
    631 	return boothowto;
    632 }
    633 
    634 void
    635 rump_boot_sethowto(int howto)
    636 {
    637 
    638 	boothowto = howto;
    639 }
    640 
    641 rump_sysproxy_t rump_sysproxy = rump_sysproxy_local;
    642 void *rump_sysproxy_arg;
    643 
    644 /*
    645  * This whole syscall-via-rpc is still taking form.  For example, it
    646  * may be necessary to set syscalls individually instead of lobbing
    647  * them all to the same place.  So don't think this interface is
    648  * set in stone.
    649  */
    650 int
    651 rump_sysproxy_set(rump_sysproxy_t proxy, void *arg)
    652 {
    653 
    654 	if (rump_sysproxy_arg)
    655 		return EBUSY;
    656 
    657 	rump_sysproxy_arg = arg;
    658 	rump_sysproxy = proxy;
    659 
    660 	return 0;
    661 }
    662 
    663 int
    664 rump_getversion(void)
    665 {
    666 
    667 	return __NetBSD_Version__;
    668 }
    669 
    670 /*
    671  * Note: may be called unscheduled.  Not fully safe since no locking
    672  * of allevents (currently that's not even available).
    673  */
    674 void
    675 rump_printevcnts()
    676 {
    677 	struct evcnt *ev;
    678 
    679 	TAILQ_FOREACH(ev, &allevents, ev_list)
    680 		rumpuser_dprintf("%s / %s: %" PRIu64 "\n",
    681 		    ev->ev_group, ev->ev_name, ev->ev_count);
    682 }
    683 
    684 /*
    685  * If you use this interface ... well ... all bets are off.
    686  * The original purpose is for the p2k fs server library to be
    687  * able to use the same pid/lid for VOPs as the host kernel.
    688  */
    689 void
    690 rump_allbetsareoff_setid(pid_t pid, int lid)
    691 {
    692 	struct lwp *l = curlwp;
    693 	struct proc *p = l->l_proc;
    694 
    695 	l->l_lid = lid;
    696 	p->p_pid = pid;
    697 }
    698