aboutsummaryrefslogtreecommitdiffstats
path: root/lib/libc/rpc/svc.c
blob: 9d7435e45ffae77b2afe7ba2b01bb72f7cf926c3 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
/*	$NetBSD: svc.c,v 1.21 2000/07/06 03:10:35 christos Exp $	*/

/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 *
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 *
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char *sccsid = "@(#)svc.c 1.44 88/02/08 Copyr 1984 Sun Micro";
static char *sccsid = "@(#)svc.c	2.4 88/08/11 4.0 RPCSRC";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * svc.c, Server-side remote procedure call interface.
 *
 * There are two sets of procedures here.  The xprt routines are
 * for handling transport handles.  The svc routines handle the
 * list of service routines.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 */

#include "namespace.h"
#include "reentrant.h"
#include <sys/types.h>
#include <sys/poll.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include <rpc/rpc.h>
#ifdef PORTMAP
#include <rpc/pmap_clnt.h>
#endif				/* PORTMAP */
#include "un-namespace.h"

#include "rpc_com.h"

#define	RQCRED_SIZE	400		/* this size is excessive */

#define SVC_VERSQUIET 0x0001		/* keep quiet about vers mismatch */
#define version_keepquiet(xp) ((u_long)(xp)->xp_p3 & SVC_VERSQUIET)

#define max(a, b) (a > b ? a : b)

/*
 * The services list
 * Each entry represents a set of procedures (an rpc program).
 * The dispatch routine takes request structs and runs the
 * apropriate procedure.
 */
static struct svc_callout {
	struct svc_callout *sc_next;
	rpcprog_t	    sc_prog;
	rpcvers_t	    sc_vers;
	char		   *sc_netid;
	void		    (*sc_dispatch)(struct svc_req *, SVCXPRT *);
} *svc_head;

extern rwlock_t svc_lock;
extern rwlock_t svc_fd_lock;

static struct svc_callout *svc_find(rpcprog_t, rpcvers_t,
    struct svc_callout **, char *);
static void __xprt_do_unregister (SVCXPRT *xprt, bool_t dolock);

/* ***************  SVCXPRT related stuff **************** */

/*
 * Activate a transport handle.
 */
void
xprt_register(xprt)
	SVCXPRT *xprt;
{
	int sock;

	assert(xprt != NULL);

	sock = xprt->xp_fd;

	rwlock_wrlock(&svc_fd_lock);
	if (__svc_xports == NULL) {
		__svc_xports = (SVCXPRT **)
			mem_alloc(FD_SETSIZE * sizeof(SVCXPRT *));
		if (__svc_xports == NULL)
			return;
		memset(__svc_xports, '\0', FD_SETSIZE * sizeof(SVCXPRT *));
	}
	if (sock < FD_SETSIZE) {
		__svc_xports[sock] = xprt;
		FD_SET(sock, &svc_fdset);
		svc_maxfd = max(svc_maxfd, sock);
	}
	rwlock_unlock(&svc_fd_lock);
}

void
xprt_unregister(SVCXPRT *xprt)
{
	__xprt_do_unregister(xprt, TRUE);
}

void
__xprt_unregister_unlocked(SVCXPRT *xprt)
{
	__xprt_do_unregister(xprt, FALSE);
}

/*
 * De-activate a transport handle.
 */
static void
__xprt_do_unregister(xprt, dolock)
	SVCXPRT *xprt;
	bool_t dolock;
{
	int sock;

	assert(xprt != NULL);

	sock = xprt->xp_fd;

	if (dolock)
		rwlock_wrlock(&svc_fd_lock);
	if ((sock < FD_SETSIZE) && (__svc_xports[sock] == xprt)) {
		__svc_xports[sock] = NULL;
		FD_CLR(sock, &svc_fdset);
		if (sock >= svc_maxfd) {
			for (svc_maxfd--; svc_maxfd>=0; svc_maxfd--)
				if (__svc_xports[svc_maxfd])
					break;
		}
	}
	if (dolock)
		rwlock_unlock(&svc_fd_lock);
}

/*
 * Add a service program to the callout list.
 * The dispatch routine will be called when a rpc request for this
 * program number comes in.
 */
bool_t
svc_reg(xprt, prog, vers, dispatch, nconf)
	SVCXPRT *xprt;
	const rpcprog_t prog;
	const rpcvers_t vers;
	void (*dispatch)(struct svc_req *, SVCXPRT *);
	const struct netconfig *nconf;
{
	bool_t dummy;
	struct svc_callout *prev;
	struct svc_callout *s;
	struct netconfig *tnconf;
	char *netid = NULL;
	int flag = 0;

/* VARIABLES PROTECTED BY svc_lock: s, prev, svc_head */

	if (xprt->xp_netid) {
		netid = strdup(xprt->xp_netid);
		flag = 1;
	} else if (nconf && nconf->nc_netid) {
		netid = strdup(nconf->nc_netid);
		flag = 1;
	} else if ((tnconf = __rpcgettp(xprt->xp_fd)) != NULL) {
		netid = strdup(tnconf->nc_netid);
		flag = 1;
		freenetconfigent(tnconf);
	} /* must have been created with svc_raw_create */
	if ((netid == NULL) && (flag == 1)) {
		return (FALSE);
	}

	rwlock_wrlock(&svc_lock);
	if ((s = svc_find(prog, vers, &prev, netid)) != NULL) {
		if (netid)
			free(netid);
		if (s->sc_dispatch == dispatch)
			goto rpcb_it; /* he is registering another xptr */
		rwlock_unlock(&svc_lock);
		return (FALSE);
	}
	s = mem_alloc(sizeof (struct svc_callout));
	if (s == NULL) {
		if (netid)
			free(netid);
		rwlock_unlock(&svc_lock);
		return (FALSE);
	}

	s->sc_prog = prog;
	s->sc_vers = vers;
	s->sc_dispatch = dispatch;
	s->sc_netid = netid;
	s->sc_next = svc_head;
	svc_head = s;

	if ((xprt->xp_netid == NULL) && (flag == 1) && netid)
		((SVCXPRT *) xprt)->xp_netid = strdup(netid);

rpcb_it:
	rwlock_unlock(&svc_lock);
	/* now register the information with the local binder service */
	if (nconf) {
		/*LINTED const castaway*/
		dummy = rpcb_set(prog, vers, (struct netconfig *) nconf,
		&((SVCXPRT *) xprt)->xp_ltaddr);
		return (dummy);
	}
	return (TRUE);
}

/*
 * Remove a service program from the callout list.
 */
void
svc_unreg(prog, vers)
	const rpcprog_t prog;
	const rpcvers_t vers;
{
	struct svc_callout *prev;
	struct svc_callout *s;

	/* unregister the information anyway */
	(void) rpcb_unset(prog, vers, NULL);
	rwlock_wrlock(&svc_lock);
	while ((s = svc_find(prog, vers, &prev, NULL)) != NULL) {
		if (prev == NULL) {
			svc_head = s->sc_next;
		} else {
			prev->sc_next = s->sc_next;
		}
		s->sc_next = NULL;
		if (s->sc_netid)
			mem_free(s->sc_netid, sizeof (s->sc_netid) + 1);
		mem_free(s, sizeof (struct svc_callout));
	}
	rwlock_unlock(&svc_lock);
}

/* ********************** CALLOUT list related stuff ************* */

#ifdef PORTMAP
/*
 * Add a service program to the callout list.
 * The dispatch routine will be called when a rpc request for this
 * program number comes in.
 */
bool_t
svc_register(xprt, prog, vers, dispatch, protocol)
	SVCXPRT *xprt;
	u_long prog;
	u_long vers;
	void (*dispatch)(struct svc_req *, SVCXPRT *);
	int protocol;
{
	struct svc_callout *prev;
	struct svc_callout *s;

	assert(xprt != NULL);
	assert(dispatch != NULL);

	if ((s = svc_find((rpcprog_t)prog, (rpcvers_t)vers, &prev, NULL)) !=
	    NULL) {
		if (s->sc_dispatch == dispatch)
			goto pmap_it;  /* he is registering another xptr */
		return (FALSE);
	}
	s = mem_alloc(sizeof(struct svc_callout));
	if (s == NULL) {
		return (FALSE);
	}
	s->sc_prog = (rpcprog_t)prog;
	s->sc_vers = (rpcvers_t)vers;
	s->sc_dispatch = dispatch;
	s->sc_next = svc_head;
	svc_head = s;
pmap_it:
	/* now register the information with the local binder service */
	if (protocol) {
		return (pmap_set(prog, vers, protocol, xprt->xp_port));
	}
	return (TRUE);
}

/*
 * Remove a service program from the callout list.
 */
void
svc_unregister(prog, vers)
	u_long prog;
	u_long vers;
{
	struct svc_callout *prev;
	struct svc_callout *s;

	if ((s = svc_find((rpcprog_t)prog, (rpcvers_t)vers, &prev, NULL)) ==
	    NULL)
		return;
	if (prev == NULL) {
		svc_head = s->sc_next;
	} else {
		prev->sc_next = s->sc_next;
	}
	s->sc_next = NULL;
	mem_free(s, sizeof(struct svc_callout));
	/* now unregister the information with the local binder service */
	(void)pmap_unset(prog, vers);
}
#endif				/* PORTMAP */

/*
 * Search the callout list for a program number, return the callout
 * struct.
 */
static struct svc_callout *
svc_find(prog, vers, prev, netid)
	rpcprog_t prog;
	rpcvers_t vers;
	struct svc_callout **prev;
	char *netid;
{
	struct svc_callout *s, *p;

	assert(prev != NULL);

	p = NULL;
	for (s = svc_head; s != NULL; s = s->sc_next) {
		if (((s->sc_prog == prog) && (s->sc_vers == vers)) &&
		    ((netid == NULL) || (s->sc_netid == NULL) ||
		    (strcmp(netid, s->sc_netid) == 0)))
			break;
		p = s;
	}
	*prev = p;
	return (s);
}

/* ******************* REPLY GENERATION ROUTINES  ************ */

/*
 * Send a reply to an rpc request
 */
bool_t
svc_sendreply(xprt, xdr_results, xdr_location)
	SVCXPRT *xprt;
	xdrproc_t xdr_results;
	void * xdr_location;
{
	struct rpc_msg rply; 

	assert(xprt != NULL);

	rply.rm_direction = REPLY;  
	rply.rm_reply.rp_stat = MSG_ACCEPTED; 
	rply.acpted_rply.ar_verf = xprt->xp_verf; 
	rply.acpted_rply.ar_stat = SUCCESS;
	rply.acpted_rply.ar_results.where = xdr_location;
	rply.acpted_rply.ar_results.proc = xdr_results;
	return (SVC_REPLY(xprt, &rply)); 
}

/*
 * No procedure error reply
 */
void
svcerr_noproc(xprt)
	SVCXPRT *xprt;
{
	struct rpc_msg rply;

	assert(xprt != NULL);

	rply.rm_direction = REPLY;
	rply.rm_reply.rp_stat = MSG_ACCEPTED;
	rply.acpted_rply.ar_verf = xprt->xp_verf;
	rply.acpted_rply.ar_stat = PROC_UNAVAIL;
	SVC_REPLY(xprt, &rply);
}

/*
 * Can't decode args error reply
 */
void
svcerr_decode(xprt)
	SVCXPRT *xprt;
{
	struct rpc_msg rply; 

	assert(xprt != NULL);

	rply.rm_direction = REPLY; 
	rply.rm_reply.rp_stat = MSG_ACCEPTED; 
	rply.acpted_rply.ar_verf = xprt->xp_verf;
	rply.acpted_rply.ar_stat = GARBAGE_ARGS;
	SVC_REPLY(xprt, &rply); 
}

/*
 * Some system error
 */
void
svcerr_systemerr(xprt)
	SVCXPRT *xprt;
{
	struct rpc_msg rply; 

	assert(xprt != NULL);

	rply.rm_direction = REPLY; 
	rply.rm_reply.rp_stat = MSG_ACCEPTED; 
	rply.acpted_rply.ar_verf = xprt->xp_verf;
	rply.acpted_rply.ar_stat = SYSTEM_ERR;
	SVC_REPLY(xprt, &rply); 
}

#if 0
/*
 * Tell RPC package to not complain about version errors to the client.	 This
 * is useful when revving broadcast protocols that sit on a fixed address.
 * There is really one (or should be only one) example of this kind of
 * protocol: the portmapper (or rpc binder).
 */
void
__svc_versquiet_on(xprt)
	SVCXPRT *xprt;
{
	u_long	tmp;

	tmp = ((u_long) xprt->xp_p3) | SVC_VERSQUIET;
	xprt->xp_p3 = tmp;
}

void
__svc_versquiet_off(xprt)
	SVCXPRT *xprt;
{
	u_long	tmp;

	tmp = ((u_long) xprt->xp_p3) & ~SVC_VERSQUIET;
	xprt->xp_p3 = tmp;
}

void
svc_versquiet(xprt)
	SVCXPRT *xprt;
{
	__svc_versquiet_on(xprt);
}

int
__svc_versquiet_get(xprt)
	SVCXPRT *xprt;
{
	return ((int) xprt->xp_p3) & SVC_VERSQUIET;
}
#endif

/*
 * Authentication error reply
 */
void
svcerr_auth(xprt, why)
	SVCXPRT *xprt;
	enum auth_stat why;
{
	struct rpc_msg rply;

	assert(xprt != NULL);

	rply.rm_direction = REPLY;
	rply.rm_reply.rp_stat = MSG_DENIED;
	rply.rjcted_rply.rj_stat = AUTH_ERROR;
	rply.rjcted_rply.rj_why = why;
	SVC_REPLY(xprt, &rply);
}

/*
 * Auth too weak error reply
 */
void
svcerr_weakauth(xprt)
	SVCXPRT *xprt;
{

	assert(xprt != NULL);

	svcerr_auth(xprt, AUTH_TOOWEAK);
}

/*
 * Program unavailable error reply
 */
void 
svcerr_noprog(xprt)
	SVCXPRT *xprt;
{
	struct rpc_msg rply;  

	assert(xprt != NULL);

	rply.rm_direction = REPLY;   
	rply.rm_reply.rp_stat = MSG_ACCEPTED;  
	rply.acpted_rply.ar_verf = xprt->xp_verf;  
	rply.acpted_rply.ar_stat = PROG_UNAVAIL;
	SVC_REPLY(xprt, &rply);
}

/*
 * Program version mismatch error reply
 */
void  
svcerr_progvers(xprt, low_vers, high_vers)
	SVCXPRT *xprt; 
	rpcvers_t low_vers;
	rpcvers_t high_vers;
{
	struct rpc_msg rply;

	assert(xprt != NULL);

	rply.rm_direction = REPLY;
	rply.rm_reply.rp_stat = MSG_ACCEPTED;
	rply.acpted_rply.ar_verf = xprt->xp_verf;
	rply.acpted_rply.ar_stat = PROG_MISMATCH;
	rply.acpted_rply.ar_vers.low = (u_int32_t)low_vers;
	rply.acpted_rply.ar_vers.high = (u_int32_t)high_vers;
	SVC_REPLY(xprt, &rply);
}

/* ******************* SERVER INPUT STUFF ******************* */

/*
 * Get server side input from some transport.
 *
 * Statement of authentication parameters management:
 * This function owns and manages all authentication parameters, specifically
 * the "raw" parameters (msg.rm_call.cb_cred and msg.rm_call.cb_verf) and
 * the "cooked" credentials (rqst->rq_clntcred).
 * However, this function does not know the structure of the cooked
 * credentials, so it make the following assumptions:
 *   a) the structure is contiguous (no pointers), and
 *   b) the cred structure size does not exceed RQCRED_SIZE bytes.
 * In all events, all three parameters are freed upon exit from this routine.
 * The storage is trivially management on the call stack in user land, but
 * is mallocated in kernel land.
 */

void
svc_getreq(rdfds)
	int rdfds;
{
	fd_set readfds;

	FD_ZERO(&readfds);
	readfds.fds_bits[0] = rdfds;
	svc_getreqset(&readfds);
}

void
svc_getreqset(readfds)
	fd_set *readfds;
{
	int bit, fd;
	fd_mask mask, *maskp;
	int sock;

	assert(readfds != NULL);

	maskp = readfds->fds_bits;
	for (sock = 0; sock < FD_SETSIZE; sock += NFDBITS) {
	    for (mask = *maskp++; (bit = ffs(mask)) != 0;
		mask ^= (1 << (bit - 1))) {
		/* sock has input waiting */
		fd = sock + bit - 1;
		svc_getreq_common(fd);
	    }
	}
}

void
svc_getreq_common(fd)
	int fd;
{
	SVCXPRT *xprt;
	struct svc_req r;
	struct rpc_msg msg;
	int prog_found;
	rpcvers_t low_vers;
	rpcvers_t high_vers;
	enum xprt_stat stat;
	char cred_area[2*MAX_AUTH_BYTES + RQCRED_SIZE];

	msg.rm_call.cb_cred.oa_base = cred_area;
	msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]);
	r.rq_clntcred = &(cred_area[2*MAX_AUTH_BYTES]);

	rwlock_rdlock(&svc_fd_lock);
	xprt = __svc_xports[fd];
	rwlock_unlock(&svc_fd_lock);
	if (xprt == NULL)
		/* But do we control sock? */
		return;
	/* now receive msgs from xprtprt (support batch calls) */
	do {
		if (SVC_RECV(xprt, &msg)) {

			/* now find the exported program and call it */
			struct svc_callout *s;
			enum auth_stat why;

			r.rq_xprt = xprt;
			r.rq_prog = msg.rm_call.cb_prog;
			r.rq_vers = msg.rm_call.cb_vers;
			r.rq_proc = msg.rm_call.cb_proc;
			r.rq_cred = msg.rm_call.cb_cred;
			/* first authenticate the message */
			if ((why = _authenticate(&r, &msg)) != AUTH_OK) {
				svcerr_auth(xprt, why);
				goto call_done;
			}
			/* now match message with a registered service*/
			prog_found = FALSE;
			low_vers = (rpcvers_t) -1L;
			high_vers = (rpcvers_t) 0L;
			for (s = svc_head; s != NULL; s = s->sc_next) {
				if (s->sc_prog == r.rq_prog) {
					if (s->sc_vers == r.rq_vers) {
						(*s->sc_dispatch)(&r, xprt);
						goto call_done;
					}  /* found correct version */
					prog_found = TRUE;
					if (s->sc_vers < low_vers)
						low_vers = s->sc_vers;
					if (s->sc_vers > high_vers)
						high_vers = s->sc_vers;
				}   /* found correct program */
			}
			/*
			 * if we got here, the program or version
			 * is not served ...
			 */
			if (prog_found)
				svcerr_progvers(xprt, low_vers, high_vers);
			else
				 svcerr_noprog(xprt);
			/* Fall through to ... */
		}
		/*
		 * Check if the xprt has been disconnected in a
		 * recursive call in the service dispatch routine.
		 * If so, then break.
		 */
		rwlock_rdlock(&svc_fd_lock);
		if (xprt != __svc_xports[fd]) {
			rwlock_unlock(&svc_fd_lock);
			break;
		}
		rwlock_unlock(&svc_fd_lock);
call_done:
		if ((stat = SVC_STAT(xprt)) == XPRT_DIED){
			SVC_DESTROY(xprt);
			break;
		}
	} while (stat == XPRT_MOREREQS);
}


void
svc_getreq_poll(pfdp, pollretval)
	struct pollfd	*pfdp;
	int	pollretval;
{
	int i;
	int fds_found;

	for (i = fds_found = 0; fds_found < pollretval; i++) {
		struct pollfd *p = &pfdp[i];

		if (p->revents) {
			/* fd has input waiting */
			fds_found++;
			/*
			 *	We assume that this function is only called
			 *	via someone _select()ing from svc_fdset or
			 *	_poll()ing from svc_pollset[].  Thus it's safe
			 *	to handle the POLLNVAL event by simply turning
			 *	the corresponding bit off in svc_fdset.  The
			 *	svc_pollset[] array is derived from svc_fdset
			 *	and so will also be updated eventually.
			 *
			 *	XXX Should we do an xprt_unregister() instead?
			 */
			if (p->revents & POLLNVAL) {
				rwlock_wrlock(&svc_fd_lock);
				FD_CLR(p->fd, &svc_fdset);
				rwlock_unlock(&svc_fd_lock);
			} else
				svc_getreq_common(p->fd);
		}
	}
}

bool_t
rpc_control(int what, void *arg)
{
	int val;

	switch (what) {
	case RPC_SVC_CONNMAXREC_SET:
		val = *(int *)arg;
		if (val <= 0)
			return FALSE;
		__svc_maxrec = val;
		return TRUE;
	case RPC_SVC_CONNMAXREC_GET:
		*(int *)arg = __svc_maxrec;
		return TRUE;
	default:
		break;
	}
	return FALSE;
}