1 /* $NetBSD: clnt_vc.c,v 1.4 2000/07/14 08:40:42 fvdl Exp $ */
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part. Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
27 * Sun Microsystems, Inc.
29 * Mountain View, California 94043
32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char *sccsid2 = "@(#)clnt_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro";
34 static char *sccsid = "@(#)clnt_tcp.c 2.2 88/08/01 4.0 RPCSRC";
35 static char sccsid3[] = "@(#)clnt_vc.c 1.19 89/03/16 Copyr 1988 Sun Micro";
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
41 * clnt_tcp.c, Implements a TCP/IP based, client side RPC.
43 * Copyright (C) 1984, Sun Microsystems, Inc.
45 * TCP based RPC supports 'batched calls'.
46 * A sequence of calls may be batched-up in a send buffer. The rpc call
47 * return immediately to the client even though the call was not necessarily
48 * sent. The batching occurs if the results' xdr routine is NULL (0) AND
49 * the rpc timeout value is zero (see clnt.h, rpc).
51 * Clients should NOT casually batch calls that in fact return results; that is,
52 * the server side should be aware that a call is batched and not produce any
53 * return message. Batched calls that produce many result messages can
54 * deadlock (netlock) the client and the server....
56 * Now go hang yourself.
59 #include <sys/param.h>
60 #include <sys/systm.h>
62 #include <sys/malloc.h>
64 #include <sys/mutex.h>
67 #include <sys/protosw.h>
68 #include <sys/socket.h>
69 #include <sys/socketvar.h>
70 #include <sys/syslog.h>
76 #include <netinet/tcp.h>
79 #include <rpc/rpc_com.h>
81 #define MCALL_MSG_SIZE 24
85 struct cmsgcred cmcred;
88 static enum clnt_stat clnt_vc_call(CLIENT *, struct rpc_callextra *,
89 rpcproc_t, struct mbuf *, struct mbuf **, struct timeval);
90 static void clnt_vc_geterr(CLIENT *, struct rpc_err *);
91 static bool_t clnt_vc_freeres(CLIENT *, xdrproc_t, void *);
92 static void clnt_vc_abort(CLIENT *);
93 static bool_t clnt_vc_control(CLIENT *, u_int, void *);
94 static void clnt_vc_close(CLIENT *);
95 static void clnt_vc_destroy(CLIENT *);
96 static bool_t time_not_ok(struct timeval *);
97 static int clnt_vc_soupcall(struct socket *so, void *arg, int waitflag);
99 static struct clnt_ops clnt_vc_ops = {
100 .cl_call = clnt_vc_call,
101 .cl_abort = clnt_vc_abort,
102 .cl_geterr = clnt_vc_geterr,
103 .cl_freeres = clnt_vc_freeres,
104 .cl_close = clnt_vc_close,
105 .cl_destroy = clnt_vc_destroy,
106 .cl_control = clnt_vc_control
110 * A pending RPC request which awaits a reply. Requests which have
111 * received their reply will have cr_xid set to zero and cr_mrep to
112 * the mbuf chain of the reply.
115 TAILQ_ENTRY(ct_request) cr_link;
116 uint32_t cr_xid; /* XID of request */
117 struct mbuf *cr_mrep; /* reply received by upcall */
118 int cr_error; /* any error from upcall */
119 char cr_verf[MAX_AUTH_BYTES]; /* reply verf */
122 TAILQ_HEAD(ct_request_list, ct_request);
126 int ct_threads; /* number of threads in clnt_vc_call */
127 bool_t ct_closing; /* TRUE if we are closing */
128 bool_t ct_closed; /* TRUE if we are closed */
129 struct socket *ct_socket; /* connection socket */
130 bool_t ct_closeit; /* close it on destroy */
131 struct timeval ct_wait; /* wait interval in milliseconds */
132 struct sockaddr_storage ct_addr; /* remote addr */
133 struct rpc_err ct_error;
135 char ct_mcallc[MCALL_MSG_SIZE]; /* marshalled callmsg */
136 size_t ct_mpos; /* pos after marshal */
137 const char *ct_waitchan;
139 struct mbuf *ct_record; /* current reply record */
140 size_t ct_record_resid; /* how much left of reply to read */
141 bool_t ct_record_eor; /* true if reading last fragment */
142 struct ct_request_list ct_pending;
143 int ct_upcallrefs; /* Ref cnt of upcalls in prog. */
146 static void clnt_vc_upcallsdone(struct ct_data *);
148 static const char clnt_vc_errstr[] = "%s : %s";
149 static const char clnt_vc_str[] = "clnt_vc_create";
150 static const char clnt_read_vc_str[] = "read_vc";
151 static const char __no_mem_str[] = "out of memory";
154 * Create a client handle for a connection.
155 * Default options are set, which the user can change using clnt_control()'s.
156 * The rpc/vc package does buffering similar to stdio, so the client
157 * must pick send and receive buffer sizes, 0 => use the default.
158 * NB: fd is copied into a private area.
159 * NB: The rpch->cl_auth is set null authentication. Caller may wish to
160 * set this something more useful.
162 * fd should be an open socket
166 struct socket *so, /* open file descriptor */
167 struct sockaddr *raddr, /* servers address */
168 const rpcprog_t prog, /* program number */
169 const rpcvers_t vers, /* version number */
170 size_t sendsz, /* buffer recv size */
171 size_t recvsz) /* buffer send size */
173 CLIENT *cl; /* client handle */
174 struct ct_data *ct = NULL; /* client handle */
176 struct rpc_msg call_msg;
177 static uint32_t disrupt;
178 struct __rpc_sockinfo si;
180 int error, interrupted, one = 1;
184 disrupt = (uint32_t)(long)raddr;
186 cl = (CLIENT *)mem_alloc(sizeof (*cl));
187 ct = (struct ct_data *)mem_alloc(sizeof (*ct));
189 mtx_init(&ct->ct_lock, "ct->ct_lock", NULL, MTX_DEF);
191 ct->ct_closing = FALSE;
192 ct->ct_closed = FALSE;
193 ct->ct_upcallrefs = 0;
195 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) {
196 error = soconnect(so, raddr, curthread);
199 while ((so->so_state & SS_ISCONNECTING)
200 && so->so_error == 0) {
201 error = msleep(&so->so_timeo, SOCK_MTX(so),
202 PSOCK | PCATCH | PBDRY, "connec", 0);
204 if (error == EINTR || error == ERESTART)
210 error = so->so_error;
216 so->so_state &= ~SS_ISCONNECTING;
217 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
218 rpc_createerr.cf_error.re_errno = error;
223 CURVNET_SET(so->so_vnet);
224 if (!__rpc_socket2sockinfo(so, &si)) {
229 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
230 bzero(&sopt, sizeof(sopt));
231 sopt.sopt_dir = SOPT_SET;
232 sopt.sopt_level = SOL_SOCKET;
233 sopt.sopt_name = SO_KEEPALIVE;
234 sopt.sopt_val = &one;
235 sopt.sopt_valsize = sizeof(one);
239 if (so->so_proto->pr_protocol == IPPROTO_TCP) {
240 bzero(&sopt, sizeof(sopt));
241 sopt.sopt_dir = SOPT_SET;
242 sopt.sopt_level = IPPROTO_TCP;
243 sopt.sopt_name = TCP_NODELAY;
244 sopt.sopt_val = &one;
245 sopt.sopt_valsize = sizeof(one);
250 ct->ct_closeit = FALSE;
253 * Set up private data struct
256 ct->ct_wait.tv_sec = -1;
257 ct->ct_wait.tv_usec = -1;
258 memcpy(&ct->ct_addr, raddr, raddr->sa_len);
261 * Initialize call message
264 ct->ct_xid = ((uint32_t)++disrupt) ^ __RPC_GETXID(&now);
265 call_msg.rm_xid = ct->ct_xid;
266 call_msg.rm_direction = CALL;
267 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
268 call_msg.rm_call.cb_prog = (uint32_t)prog;
269 call_msg.rm_call.cb_vers = (uint32_t)vers;
272 * pre-serialize the static part of the call msg and stash it away
274 xdrmem_create(&xdrs, ct->ct_mcallc, MCALL_MSG_SIZE,
276 if (! xdr_callhdr(&xdrs, &call_msg)) {
277 if (ct->ct_closeit) {
278 soclose(ct->ct_socket);
282 ct->ct_mpos = XDR_GETPOS(&xdrs);
284 ct->ct_waitchan = "rpcrecv";
288 * Create a client handle which uses xdrrec for serialization
289 * and authnone for authentication.
291 sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz);
292 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz);
293 error = soreserve(ct->ct_socket, sendsz, recvsz);
295 if (ct->ct_closeit) {
296 soclose(ct->ct_socket);
301 cl->cl_ops = &clnt_vc_ops;
303 cl->cl_auth = authnone_create();
305 SOCKBUF_LOCK(&ct->ct_socket->so_rcv);
306 soupcall_set(ct->ct_socket, SO_RCV, clnt_vc_soupcall, ct);
307 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv);
309 ct->ct_record = NULL;
310 ct->ct_record_resid = 0;
311 TAILQ_INIT(&ct->ct_pending);
317 mtx_destroy(&ct->ct_lock);
318 mem_free(ct, sizeof (struct ct_data));
321 mem_free(cl, sizeof (CLIENT));
323 return ((CLIENT *)NULL);
326 static enum clnt_stat
328 CLIENT *cl, /* client handle */
329 struct rpc_callextra *ext, /* call metadata */
330 rpcproc_t proc, /* procedure number */
331 struct mbuf *args, /* pointer to args */
332 struct mbuf **resultsp, /* pointer to results */
333 struct timeval utimeout)
335 struct ct_data *ct = (struct ct_data *) cl->cl_private;
337 struct rpc_err *errp;
340 struct rpc_msg reply_msg;
342 int nrefreshes = 2; /* number of times to refresh cred */
343 struct timeval timeout;
345 struct mbuf *mreq = NULL, *results;
346 struct ct_request *cr;
349 cr = malloc(sizeof(struct ct_request), M_RPC, M_WAITOK);
351 mtx_lock(&ct->ct_lock);
353 if (ct->ct_closing || ct->ct_closed) {
354 mtx_unlock(&ct->ct_lock);
356 return (RPC_CANTSEND);
365 errp = &ct->ct_error;
371 if (ct->ct_wait.tv_usec == -1) {
372 timeout = utimeout; /* use supplied timeout */
374 timeout = ct->ct_wait; /* use default timeout */
378 mtx_assert(&ct->ct_lock, MA_OWNED);
383 mtx_unlock(&ct->ct_lock);
386 * Leave space to pre-pend the record mark.
388 MGETHDR(mreq, M_WAIT, MT_DATA);
389 mreq->m_data += sizeof(uint32_t);
390 KASSERT(ct->ct_mpos + sizeof(uint32_t) <= MHLEN,
391 ("RPC header too big"));
392 bcopy(ct->ct_mcallc, mreq->m_data, ct->ct_mpos);
393 mreq->m_len = ct->ct_mpos;
396 * The XID is the first thing in the request.
398 *mtod(mreq, uint32_t *) = htonl(xid);
400 xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
402 errp->re_status = stat = RPC_SUCCESS;
404 if ((! XDR_PUTINT32(&xdrs, &proc)) ||
405 (! AUTH_MARSHALL(auth, xid, &xdrs,
406 m_copym(args, 0, M_COPYALL, M_WAITOK)))) {
407 errp->re_status = stat = RPC_CANTENCODEARGS;
408 mtx_lock(&ct->ct_lock);
411 mreq->m_pkthdr.len = m_length(mreq, NULL);
414 * Prepend a record marker containing the packet length.
416 M_PREPEND(mreq, sizeof(uint32_t), M_WAIT);
417 *mtod(mreq, uint32_t *) =
418 htonl(0x80000000 | (mreq->m_pkthdr.len - sizeof(uint32_t)));
421 mtx_lock(&ct->ct_lock);
423 * Check to see if the other end has already started to close down
424 * the connection. The upcall will have set ct_error.re_status
425 * to RPC_CANTRECV if this is the case.
426 * If the other end starts to close down the connection after this
427 * point, it will be detected later when cr_error is checked,
428 * since the request is in the ct_pending queue.
430 if (ct->ct_error.re_status == RPC_CANTRECV) {
431 if (errp != &ct->ct_error) {
432 errp->re_errno = ct->ct_error.re_errno;
433 errp->re_status = RPC_CANTRECV;
438 TAILQ_INSERT_TAIL(&ct->ct_pending, cr, cr_link);
439 mtx_unlock(&ct->ct_lock);
442 * sosend consumes mreq.
444 error = sosend(ct->ct_socket, NULL, NULL, mreq, NULL, 0, curthread);
446 if (error == EMSGSIZE) {
447 SOCKBUF_LOCK(&ct->ct_socket->so_snd);
448 sbwait(&ct->ct_socket->so_snd);
449 SOCKBUF_UNLOCK(&ct->ct_socket->so_snd);
450 AUTH_VALIDATE(auth, xid, NULL, NULL);
451 mtx_lock(&ct->ct_lock);
452 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
456 reply_msg.acpted_rply.ar_verf.oa_flavor = AUTH_NULL;
457 reply_msg.acpted_rply.ar_verf.oa_base = cr->cr_verf;
458 reply_msg.acpted_rply.ar_verf.oa_length = 0;
459 reply_msg.acpted_rply.ar_results.where = NULL;
460 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
462 mtx_lock(&ct->ct_lock);
464 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
465 errp->re_errno = error;
466 errp->re_status = stat = RPC_CANTSEND;
471 * Check to see if we got an upcall while waiting for the
472 * lock. In both these cases, the request has been removed
473 * from ct->ct_pending.
476 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
477 errp->re_errno = cr->cr_error;
478 errp->re_status = stat = RPC_CANTRECV;
482 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
487 * Hack to provide rpc-based message passing
489 if (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
490 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
491 errp->re_status = stat = RPC_TIMEDOUT;
495 error = msleep(cr, &ct->ct_lock, ct->ct_waitflag, ct->ct_waitchan,
498 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
502 * The sleep returned an error so our request is still
503 * on the list. Turn the error code into an
504 * appropriate client status.
506 errp->re_errno = error;
518 errp->re_status = stat;
522 * We were woken up by the upcall. If the
523 * upcall had a receive error, report that,
524 * otherwise we have a reply.
527 errp->re_errno = cr->cr_error;
528 errp->re_status = stat = RPC_CANTRECV;
535 * Now decode and validate the response. We need to drop the
536 * lock since xdr_replymsg may end up sleeping in malloc.
538 mtx_unlock(&ct->ct_lock);
540 if (ext && ext->rc_feedback)
541 ext->rc_feedback(FEEDBACK_OK, proc, ext->rc_feedback_arg);
543 xdrmbuf_create(&xdrs, cr->cr_mrep, XDR_DECODE);
544 ok = xdr_replymsg(&xdrs, &reply_msg);
548 if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
549 (reply_msg.acpted_rply.ar_stat == SUCCESS))
550 errp->re_status = stat = RPC_SUCCESS;
552 stat = _seterr_reply(&reply_msg, errp);
554 if (stat == RPC_SUCCESS) {
555 results = xdrmbuf_getall(&xdrs);
556 if (!AUTH_VALIDATE(auth, xid,
557 &reply_msg.acpted_rply.ar_verf,
559 errp->re_status = stat = RPC_AUTHERROR;
560 errp->re_why = AUTH_INVALIDRESP;
563 ("auth validated but no result"));
566 } /* end successful completion */
568 * If unsuccesful AND error is an authentication error
569 * then refresh credentials and try again, else break
571 else if (stat == RPC_AUTHERROR)
572 /* maybe our credentials need to be refreshed ... */
573 if (nrefreshes > 0 &&
574 AUTH_REFRESH(auth, &reply_msg)) {
577 mtx_lock(&ct->ct_lock);
580 /* end of unsuccessful completion */
581 } /* end of valid reply message */
583 errp->re_status = stat = RPC_CANTDECODERES;
586 mtx_lock(&ct->ct_lock);
588 mtx_assert(&ct->ct_lock, MA_OWNED);
590 KASSERT(stat != RPC_SUCCESS || *resultsp,
591 ("RPC_SUCCESS without reply"));
596 m_freem(cr->cr_mrep);
602 mtx_unlock(&ct->ct_lock);
604 if (auth && stat != RPC_SUCCESS)
605 AUTH_VALIDATE(auth, xid, NULL, NULL);
613 clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp)
615 struct ct_data *ct = (struct ct_data *) cl->cl_private;
617 *errp = ct->ct_error;
621 clnt_vc_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
626 xdrs.x_op = XDR_FREE;
627 dummy = (*xdr_res)(&xdrs, res_ptr);
634 clnt_vc_abort(CLIENT *cl)
639 clnt_vc_control(CLIENT *cl, u_int request, void *info)
641 struct ct_data *ct = (struct ct_data *)cl->cl_private;
644 mtx_lock(&ct->ct_lock);
648 ct->ct_closeit = TRUE;
649 mtx_unlock(&ct->ct_lock);
651 case CLSET_FD_NCLOSE:
652 ct->ct_closeit = FALSE;
653 mtx_unlock(&ct->ct_lock);
659 /* for other requests which use info */
661 mtx_unlock(&ct->ct_lock);
666 if (time_not_ok((struct timeval *)info)) {
667 mtx_unlock(&ct->ct_lock);
670 ct->ct_wait = *(struct timeval *)infop;
673 *(struct timeval *)infop = ct->ct_wait;
675 case CLGET_SERVER_ADDR:
676 (void) memcpy(info, &ct->ct_addr, (size_t)ct->ct_addr.ss_len);
680 * Slightly different semantics to userland - we use
681 * sockaddr instead of netbuf.
683 memcpy(info, &ct->ct_addr, ct->ct_addr.ss_len);
685 case CLSET_SVC_ADDR: /* set to new address */
686 mtx_unlock(&ct->ct_lock);
689 *(uint32_t *)info = ct->ct_xid;
692 /* This will set the xid of the NEXT call */
693 /* decrement by 1 as clnt_vc_call() increments once */
694 ct->ct_xid = *(uint32_t *)info - 1;
698 * This RELIES on the information that, in the call body,
699 * the version number field is the fifth field from the
700 * begining of the RPC header. MUST be changed if the
701 * call_struct is changed
704 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc +
705 4 * BYTES_PER_XDR_UNIT));
709 *(uint32_t *)(void *)(ct->ct_mcallc +
710 4 * BYTES_PER_XDR_UNIT) =
711 htonl(*(uint32_t *)info);
716 * This RELIES on the information that, in the call body,
717 * the program number field is the fourth field from the
718 * begining of the RPC header. MUST be changed if the
719 * call_struct is changed
722 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc +
723 3 * BYTES_PER_XDR_UNIT));
727 *(uint32_t *)(void *)(ct->ct_mcallc +
728 3 * BYTES_PER_XDR_UNIT) =
729 htonl(*(uint32_t *)info);
733 ct->ct_waitchan = (const char *)info;
737 *(const char **) info = ct->ct_waitchan;
740 case CLSET_INTERRUPTIBLE:
742 ct->ct_waitflag = PCATCH | PBDRY;
747 case CLGET_INTERRUPTIBLE:
749 *(int *) info = TRUE;
751 *(int *) info = FALSE;
755 mtx_unlock(&ct->ct_lock);
759 mtx_unlock(&ct->ct_lock);
764 clnt_vc_close(CLIENT *cl)
766 struct ct_data *ct = (struct ct_data *) cl->cl_private;
767 struct ct_request *cr;
769 mtx_lock(&ct->ct_lock);
772 mtx_unlock(&ct->ct_lock);
776 if (ct->ct_closing) {
777 while (ct->ct_closing)
778 msleep(ct, &ct->ct_lock, 0, "rpcclose", 0);
779 KASSERT(ct->ct_closed, ("client should be closed"));
780 mtx_unlock(&ct->ct_lock);
785 ct->ct_closing = TRUE;
786 mtx_unlock(&ct->ct_lock);
788 SOCKBUF_LOCK(&ct->ct_socket->so_rcv);
789 soupcall_clear(ct->ct_socket, SO_RCV);
790 clnt_vc_upcallsdone(ct);
791 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv);
794 * Abort any pending requests and wait until everyone
795 * has finished with clnt_vc_call.
797 mtx_lock(&ct->ct_lock);
798 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
800 cr->cr_error = ESHUTDOWN;
804 while (ct->ct_threads)
805 msleep(ct, &ct->ct_lock, 0, "rpcclose", 0);
808 ct->ct_closing = FALSE;
809 ct->ct_closed = TRUE;
810 mtx_unlock(&ct->ct_lock);
815 clnt_vc_destroy(CLIENT *cl)
817 struct ct_data *ct = (struct ct_data *) cl->cl_private;
818 struct socket *so = NULL;
822 mtx_lock(&ct->ct_lock);
825 if (ct->ct_closeit) {
830 mtx_unlock(&ct->ct_lock);
832 mtx_destroy(&ct->ct_lock);
834 soshutdown(so, SHUT_WR);
837 mem_free(ct, sizeof(struct ct_data));
838 mem_free(cl, sizeof(CLIENT));
842 * Make sure that the time is not garbage. -1 value is disallowed.
843 * Note this is different from time_not_ok in clnt_dg.c
846 time_not_ok(struct timeval *t)
848 return (t->tv_sec <= -1 || t->tv_sec > 100000000 ||
849 t->tv_usec <= -1 || t->tv_usec > 1000000);
853 clnt_vc_soupcall(struct socket *so, void *arg, int waitflag)
855 struct ct_data *ct = (struct ct_data *) arg;
858 struct ct_request *cr;
859 int error, rcvflag, foundreq;
860 uint32_t xid, header;
864 uio.uio_td = curthread;
867 * If ct_record_resid is zero, we are waiting for a
870 if (ct->ct_record_resid == 0) {
873 * Make sure there is either a whole record
874 * mark in the buffer or there is some other
878 if (so->so_rcv.sb_cc >= sizeof(uint32_t)
879 || (so->so_rcv.sb_state & SBS_CANTRCVMORE)
886 SOCKBUF_UNLOCK(&so->so_rcv);
887 uio.uio_resid = sizeof(uint32_t);
889 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK;
890 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag);
891 SOCKBUF_LOCK(&so->so_rcv);
893 if (error == EWOULDBLOCK)
897 * If there was an error, wake up all pending
900 if (error || uio.uio_resid > 0) {
902 mtx_lock(&ct->ct_lock);
905 * We must have got EOF trying
906 * to read from the stream.
910 ct->ct_error.re_status = RPC_CANTRECV;
911 ct->ct_error.re_errno = error;
912 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
913 cr->cr_error = error;
916 mtx_unlock(&ct->ct_lock);
919 bcopy(mtod(m, uint32_t *), &header, sizeof(uint32_t));
920 header = ntohl(header);
921 ct->ct_record = NULL;
922 ct->ct_record_resid = header & 0x7fffffff;
923 ct->ct_record_eor = ((header & 0x80000000) != 0);
927 * Wait until the socket has the whole record
931 if (so->so_rcv.sb_cc >= ct->ct_record_resid
932 || (so->so_rcv.sb_state & SBS_CANTRCVMORE)
940 * We have the record mark. Read as much as
941 * the socket has buffered up to the end of
944 SOCKBUF_UNLOCK(&so->so_rcv);
945 uio.uio_resid = ct->ct_record_resid;
947 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK;
948 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag);
949 SOCKBUF_LOCK(&so->so_rcv);
951 if (error == EWOULDBLOCK)
954 if (error || uio.uio_resid == ct->ct_record_resid)
958 * If we have part of the record already,
959 * chain this bit onto the end.
962 m_last(ct->ct_record)->m_next = m;
966 ct->ct_record_resid = uio.uio_resid;
969 * If we have the entire record, see if we can
970 * match it to a request.
972 if (ct->ct_record_resid == 0
973 && ct->ct_record_eor) {
975 * The XID is in the first uint32_t of
978 if (ct->ct_record->m_len < sizeof(xid))
980 m_pullup(ct->ct_record,
984 bcopy(mtod(ct->ct_record, uint32_t *),
985 &xid, sizeof(uint32_t));
988 mtx_lock(&ct->ct_lock);
990 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
991 if (cr->cr_xid == xid) {
998 * that we will ignore
1003 cr->cr_mrep = ct->ct_record;
1010 mtx_unlock(&ct->ct_lock);
1013 m_freem(ct->ct_record);
1014 ct->ct_record = NULL;
1018 ct->ct_upcallrefs--;
1019 if (ct->ct_upcallrefs < 0)
1020 panic("rpcvc upcall refcnt");
1021 if (ct->ct_upcallrefs == 0)
1022 wakeup(&ct->ct_upcallrefs);
1027 * Wait for all upcalls in progress to complete.
1030 clnt_vc_upcallsdone(struct ct_data *ct)
1033 SOCKBUF_LOCK_ASSERT(&ct->ct_socket->so_rcv);
1035 while (ct->ct_upcallrefs > 0)
1036 (void) msleep(&ct->ct_upcallrefs,
1037 SOCKBUF_MTX(&ct->ct_socket->so_rcv), 0, "rpcvcup", 0);