2 * Copyright (c) 2005 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 1982, 1986, 1988, 1990, 1993
4 * The Regents of the University of California. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the University of
17 * California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)uipc_socket2.c 8.1 (Berkeley) 6/10/93
35 * $FreeBSD: src/sys/kern/uipc_socket2.c,v 1.55.2.17 2002/08/31 19:04:55 dwmalone Exp $
36 * $DragonFly: src/sys/kern/uipc_socket2.c,v 1.33 2008/09/02 16:17:52 dillon Exp $
39 #include "opt_param.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/domain.h>
43 #include <sys/file.h> /* for maxfiles */
44 #include <sys/kernel.h>
46 #include <sys/malloc.h>
48 #include <sys/protosw.h>
49 #include <sys/resourcevar.h>
51 #include <sys/socket.h>
52 #include <sys/socketvar.h>
53 #include <sys/signalvar.h>
54 #include <sys/sysctl.h>
55 #include <sys/aio.h> /* for aio_swake proto */
56 #include <sys/event.h>
58 #include <sys/thread2.h>
59 #include <sys/msgport2.h>
64 * Primitive routines for operating on sockets and socket buffers
67 u_long sb_max = SB_MAX;
69 SB_MAX * MCLBYTES / (MSIZE + MCLBYTES); /* adjusted sb_max */
71 static u_long sb_efficiency = 8; /* parameter for sbreserve() */
73 /************************************************************************
74 * signalsockbuf procedures *
75 ************************************************************************/
78 * Wait for data to arrive at/drain from a socket buffer.
80 * NOTE: Caller must generally hold the ssb_lock (client side lock) since
81 * WAIT/WAKEUP only works for one client at a time.
83 * NOTE: Caller always retries whatever operation it was waiting on.
86 ssb_wait(struct signalsockbuf *ssb)
92 pflags = (ssb->ssb_flags & SSB_NOINTR) ? 0 : PCATCH;
95 flags = ssb->ssb_flags;
99 * WAKEUP and WAIT interlock eachother. We can catch the
100 * race by checking to see if WAKEUP has already been set,
101 * and only setting WAIT if WAKEUP is clear.
103 if (flags & SSB_WAKEUP) {
104 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
105 flags & ~SSB_WAKEUP)) {
113 * Only set WAIT if WAKEUP is clear.
115 tsleep_interlock(&ssb->ssb_cc, pflags);
116 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
118 error = tsleep(&ssb->ssb_cc, pflags | PINTERLOCKED,
119 "sbwait", ssb->ssb_timeo);
127 * Lock a sockbuf already known to be locked;
128 * return any error returned from sleep (EINTR).
131 _ssb_lock(struct signalsockbuf *ssb)
137 pflags = (ssb->ssb_flags & SSB_NOINTR) ? 0 : PCATCH;
140 flags = ssb->ssb_flags;
142 if (flags & SSB_LOCK) {
143 tsleep_interlock(&ssb->ssb_flags, pflags);
144 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
146 error = tsleep(&ssb->ssb_flags,
147 pflags | PINTERLOCKED,
153 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
164 * This does the same for sockbufs. Note that the xsockbuf structure,
165 * since it is always embedded in a socket, does not include a self
166 * pointer nor a length. We make this entry point public in case
167 * some other mechanism needs it.
170 ssbtoxsockbuf(struct signalsockbuf *ssb, struct xsockbuf *xsb)
172 xsb->sb_cc = ssb->ssb_cc;
173 xsb->sb_hiwat = ssb->ssb_hiwat;
174 xsb->sb_mbcnt = ssb->ssb_mbcnt;
175 xsb->sb_mbmax = ssb->ssb_mbmax;
176 xsb->sb_lowat = ssb->ssb_lowat;
177 xsb->sb_flags = ssb->ssb_flags;
178 xsb->sb_timeo = ssb->ssb_timeo;
182 /************************************************************************
183 * Procedures which manipulate socket state flags, wakeups, etc. *
184 ************************************************************************
186 * Normal sequence from the active (originating) side is that
187 * soisconnecting() is called during processing of connect() call, resulting
188 * in an eventual call to soisconnected() if/when the connection is
189 * established. When the connection is torn down soisdisconnecting() is
190 * called during processing of disconnect() call, and soisdisconnected() is
191 * called when the connection to the peer is totally severed.
193 * The semantics of these routines are such that connectionless protocols
194 * can call soisconnected() and soisdisconnected() only, bypassing the
195 * in-progress calls when setting up a ``connection'' takes no time.
197 * From the passive side, a socket is created with two queues of sockets:
198 * so_incomp for connections in progress and so_comp for connections
199 * already made and awaiting user acceptance. As a protocol is preparing
200 * incoming connections, it creates a socket structure queued on so_incomp
201 * by calling sonewconn(). When the connection is established,
202 * soisconnected() is called, and transfers the socket structure to so_comp,
203 * making it available to accept().
205 * If a socket is closed with sockets on either so_incomp or so_comp, these
206 * sockets are dropped.
208 * If higher level protocols are implemented in the kernel, the wakeups
209 * done here will sometimes cause software-interrupt process scheduling.
213 soisconnecting(struct socket *so)
215 so->so_state &= ~(SS_ISCONNECTED|SS_ISDISCONNECTING);
216 so->so_state |= SS_ISCONNECTING;
220 soisconnected(struct socket *so)
222 struct socket *head = so->so_head;
224 so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING);
225 so->so_state |= SS_ISCONNECTED;
226 if (head && (so->so_state & SS_INCOMP)) {
227 if ((so->so_options & SO_ACCEPTFILTER) != 0) {
228 so->so_upcall = head->so_accf->so_accept_filter->accf_callback;
229 so->so_upcallarg = head->so_accf->so_accept_filter_arg;
230 atomic_set_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
231 so->so_options &= ~SO_ACCEPTFILTER;
232 so->so_upcall(so, so->so_upcallarg, 0);
235 TAILQ_REMOVE(&head->so_incomp, so, so_list);
237 so->so_state &= ~SS_INCOMP;
238 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
240 so->so_state |= SS_COMP;
242 wakeup_one(&head->so_timeo);
244 wakeup(&so->so_timeo);
251 soisdisconnecting(struct socket *so)
253 so->so_state &= ~SS_ISCONNECTING;
254 so->so_state |= (SS_ISDISCONNECTING|SS_CANTRCVMORE|SS_CANTSENDMORE);
255 wakeup((caddr_t)&so->so_timeo);
261 soisdisconnected(struct socket *so)
263 so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING);
264 so->so_state |= (SS_CANTRCVMORE|SS_CANTSENDMORE|SS_ISDISCONNECTED);
265 wakeup((caddr_t)&so->so_timeo);
266 sbdrop(&so->so_snd.sb, so->so_snd.ssb_cc);
272 soisreconnecting(struct socket *so)
274 so->so_state &= ~(SS_ISDISCONNECTING|SS_ISDISCONNECTED|SS_CANTRCVMORE|
276 so->so_state |= SS_ISCONNECTING;
280 soisreconnected(struct socket *so)
282 so->so_state &= ~(SS_ISDISCONNECTED|SS_CANTRCVMORE|SS_CANTSENDMORE);
287 * Set or change the message port a socket receives commands on.
292 sosetport(struct socket *so, lwkt_port_t port)
298 * When an attempt at a new connection is noted on a socket
299 * which accepts connections, sonewconn is called. If the
300 * connection is possible (subject to space constraints, etc.)
301 * then we allocate a new structure, propoerly linked into the
302 * data structure of the original socket, and return this.
303 * Connstatus may be 0, or SO_ISCONFIRMING, or SO_ISCONNECTED.
306 sonewconn(struct socket *head, int connstatus)
310 struct pru_attach_info ai;
312 if (head->so_qlen > 3 * head->so_qlimit / 2)
317 if ((head->so_options & SO_ACCEPTFILTER) != 0)
320 so->so_type = head->so_type;
321 so->so_options = head->so_options &~ SO_ACCEPTCONN;
322 so->so_linger = head->so_linger;
323 so->so_state = head->so_state | SS_NOFDREF;
324 so->so_proto = head->so_proto;
325 so->so_cred = crhold(head->so_cred);
328 ai.fd_rdir = NULL; /* jail code cruft XXX JH */
329 if (soreserve(so, head->so_snd.ssb_hiwat, head->so_rcv.ssb_hiwat, NULL) ||
330 /* Directly call function since we're already at protocol level. */
331 (*so->so_proto->pr_usrreqs->pru_attach)(so, 0, &ai)) {
335 KKASSERT(so->so_port != NULL);
336 so->so_rcv.ssb_lowat = head->so_rcv.ssb_lowat;
337 so->so_snd.ssb_lowat = head->so_snd.ssb_lowat;
338 so->so_rcv.ssb_timeo = head->so_rcv.ssb_timeo;
339 so->so_snd.ssb_timeo = head->so_snd.ssb_timeo;
340 so->so_rcv.ssb_flags |= head->so_rcv.ssb_flags &
341 (SSB_AUTOSIZE | SSB_AUTOLOWAT);
342 so->so_snd.ssb_flags |= head->so_snd.ssb_flags &
343 (SSB_AUTOSIZE | SSB_AUTOLOWAT);
345 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
346 so->so_state |= SS_COMP;
349 if (head->so_incqlen > head->so_qlimit) {
350 sp = TAILQ_FIRST(&head->so_incomp);
351 TAILQ_REMOVE(&head->so_incomp, sp, so_list);
353 sp->so_state &= ~SS_INCOMP;
357 TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list);
358 so->so_state |= SS_INCOMP;
363 wakeup((caddr_t)&head->so_timeo);
364 so->so_state |= connstatus;
370 * Socantsendmore indicates that no more data will be sent on the
371 * socket; it would normally be applied to a socket when the user
372 * informs the system that no more data is to be sent, by the protocol
373 * code (in case PRU_SHUTDOWN). Socantrcvmore indicates that no more data
374 * will be received, and will normally be applied to the socket by a
375 * protocol when it detects that the peer will send no more data.
376 * Data queued for reading in the socket may yet be read.
379 socantsendmore(struct socket *so)
381 so->so_state |= SS_CANTSENDMORE;
386 socantrcvmore(struct socket *so)
388 so->so_state |= SS_CANTRCVMORE;
393 * Wakeup processes waiting on a socket buffer. Do asynchronous notification
394 * via SIGIO if the socket has the SS_ASYNC flag set.
396 * For users waiting on send/recv try to avoid unnecessary context switch
397 * thrashing. Particularly for senders of large buffers (needs to be
398 * extended to sel and aio? XXX)
401 sowakeup(struct socket *so, struct signalsockbuf *ssb)
403 struct kqinfo *kqinfo = &ssb->ssb_kq;
407 * Check conditions, set the WAKEUP flag, and clear and signal if
408 * the WAIT flag is found to be set. This interlocks against the
412 flags = ssb->ssb_flags;
415 if ((ssb == &so->so_snd && ssb_space(ssb) >= ssb->ssb_lowat) ||
416 (ssb == &so->so_rcv && ssb->ssb_cc >= ssb->ssb_lowat) ||
417 (ssb == &so->so_snd && (so->so_state & SS_CANTSENDMORE)) ||
418 (ssb == &so->so_rcv && (so->so_state & SS_CANTRCVMORE))
420 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
421 (flags | SSB_WAKEUP) & ~SSB_WAIT)) {
422 if (flags & SSB_WAIT)
423 wakeup(&ssb->ssb_cc);
434 if ((so->so_state & SS_ASYNC) && so->so_sigio != NULL)
435 pgsigio(so->so_sigio, SIGIO, 0);
436 if (ssb->ssb_flags & SSB_UPCALL)
437 (*so->so_upcall)(so, so->so_upcallarg, MB_DONTWAIT);
438 if (ssb->ssb_flags & SSB_AIO)
440 KNOTE(&kqinfo->ki_note, 0);
441 if (ssb->ssb_flags & SSB_MEVENT) {
442 struct netmsg_so_notify *msg, *nmsg;
444 TAILQ_FOREACH_MUTABLE(msg, &kqinfo->ki_mlist, nm_list, nmsg) {
445 if (msg->nm_predicate(&msg->nm_netmsg)) {
446 TAILQ_REMOVE(&kqinfo->ki_mlist, msg, nm_list);
447 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg,
448 msg->nm_netmsg.nm_lmsg.ms_error);
451 if (TAILQ_EMPTY(&ssb->ssb_kq.ki_mlist))
452 atomic_clear_int(&ssb->ssb_flags, SSB_MEVENT);
457 * Socket buffer (struct signalsockbuf) utility routines.
459 * Each socket contains two socket buffers: one for sending data and
460 * one for receiving data. Each buffer contains a queue of mbufs,
461 * information about the number of mbufs and amount of data in the
462 * queue, and other fields allowing kevent()/select()/poll() statements
463 * and notification on data availability to be implemented.
465 * Data stored in a socket buffer is maintained as a list of records.
466 * Each record is a list of mbufs chained together with the m_next
467 * field. Records are chained together with the m_nextpkt field. The upper
468 * level routine soreceive() expects the following conventions to be
469 * observed when placing information in the receive buffer:
471 * 1. If the protocol requires each message be preceded by the sender's
472 * name, then a record containing that name must be present before
473 * any associated data (mbuf's must be of type MT_SONAME).
474 * 2. If the protocol supports the exchange of ``access rights'' (really
475 * just additional data associated with the message), and there are
476 * ``rights'' to be received, then a record containing this data
477 * should be present (mbuf's must be of type MT_RIGHTS).
478 * 3. If a name or rights record exists, then it must be followed by
479 * a data record, perhaps of zero length.
481 * Before using a new socket structure it is first necessary to reserve
482 * buffer space to the socket, by calling sbreserve(). This should commit
483 * some of the available buffer space in the system buffer pool for the
484 * socket (currently, it does nothing but enforce limits). The space
485 * should be released by calling ssb_release() when the socket is destroyed.
488 soreserve(struct socket *so, u_long sndcc, u_long rcvcc, struct rlimit *rl)
490 if (so->so_snd.ssb_lowat == 0)
491 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOLOWAT);
492 if (ssb_reserve(&so->so_snd, sndcc, so, rl) == 0)
494 if (ssb_reserve(&so->so_rcv, rcvcc, so, rl) == 0)
496 if (so->so_rcv.ssb_lowat == 0)
497 so->so_rcv.ssb_lowat = 1;
498 if (so->so_snd.ssb_lowat == 0)
499 so->so_snd.ssb_lowat = MCLBYTES;
500 if (so->so_snd.ssb_lowat > so->so_snd.ssb_hiwat)
501 so->so_snd.ssb_lowat = so->so_snd.ssb_hiwat;
504 ssb_release(&so->so_snd, so);
510 sysctl_handle_sb_max(SYSCTL_HANDLER_ARGS)
513 u_long old_sb_max = sb_max;
515 error = SYSCTL_OUT(req, arg1, sizeof(int));
516 if (error || !req->newptr)
518 error = SYSCTL_IN(req, arg1, sizeof(int));
521 if (sb_max < MSIZE + MCLBYTES) {
525 sb_max_adj = (u_quad_t)sb_max * MCLBYTES / (MSIZE + MCLBYTES);
530 * Allot mbufs to a signalsockbuf.
532 * Attempt to scale mbmax so that mbcnt doesn't become limiting
533 * if buffering efficiency is near the normal case.
535 * sb_max only applies to user-sockets (where rl != NULL). It does
536 * not apply to kernel sockets or kernel-controlled sockets. Note
537 * that NFS overrides the sockbuf limits created when nfsd creates
541 ssb_reserve(struct signalsockbuf *ssb, u_long cc, struct socket *so,
545 * rl will only be NULL when we're in an interrupt (eg, in tcp_input)
546 * or when called from netgraph (ie, ngd_attach)
548 if (rl && cc > sb_max_adj)
550 if (!chgsbsize(so->so_cred->cr_uidinfo, &ssb->ssb_hiwat, cc,
551 rl ? rl->rlim_cur : RLIM_INFINITY)) {
555 ssb->ssb_mbmax = min(cc * sb_efficiency, sb_max);
557 ssb->ssb_mbmax = cc * sb_efficiency;
560 * AUTOLOWAT is set on send buffers and prevents large writes
561 * from generating a huge number of context switches.
563 if (ssb->ssb_flags & SSB_AUTOLOWAT) {
564 ssb->ssb_lowat = ssb->ssb_hiwat / 2;
565 if (ssb->ssb_lowat < MCLBYTES)
566 ssb->ssb_lowat = MCLBYTES;
568 if (ssb->ssb_lowat > ssb->ssb_hiwat)
569 ssb->ssb_lowat = ssb->ssb_hiwat;
574 * Free mbufs held by a socket, and reserved mbuf space.
577 ssb_release(struct signalsockbuf *ssb, struct socket *so)
580 (void)chgsbsize(so->so_cred->cr_uidinfo, &ssb->ssb_hiwat, 0,
586 * Some routines that return EOPNOTSUPP for entry points that are not
587 * supported by a protocol. Fill in as needed.
590 pru_accept_notsupp(struct socket *so, struct sockaddr **nam)
596 pru_bind_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
602 pru_connect_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
608 pru_connect2_notsupp(struct socket *so1, struct socket *so2)
614 pru_control_notsupp(struct socket *so, u_long cmd, caddr_t data,
615 struct ifnet *ifp, struct thread *td)
621 pru_disconnect_notsupp(struct socket *so)
627 pru_listen_notsupp(struct socket *so, struct thread *td)
633 pru_peeraddr_notsupp(struct socket *so, struct sockaddr **nam)
639 pru_rcvd_notsupp(struct socket *so, int flags)
645 pru_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags)
651 pru_shutdown_notsupp(struct socket *so)
657 pru_sockaddr_notsupp(struct socket *so, struct sockaddr **nam)
663 pru_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio,
664 struct mbuf *top, struct mbuf *control, int flags,
675 pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
676 struct uio *uio, struct sockbuf *sio,
677 struct mbuf **controlp, int *flagsp)
683 pru_ctloutput_notsupp(struct socket *so, struct sockopt *sopt)
689 * This isn't really a ``null'' operation, but it's the default one
690 * and doesn't do anything destructive.
693 pru_sense_null(struct socket *so, struct stat *sb)
695 sb->st_blksize = so->so_snd.ssb_hiwat;
700 * Make a copy of a sockaddr in a malloced buffer of type M_SONAME. Callers
701 * of this routine assume that it always succeeds, so we have to use a
702 * blockable allocation even though we might be called from a critical thread.
705 dup_sockaddr(const struct sockaddr *sa)
707 struct sockaddr *sa2;
709 sa2 = kmalloc(sa->sa_len, M_SONAME, M_INTWAIT);
710 bcopy(sa, sa2, sa->sa_len);
715 * Create an external-format (``xsocket'') structure using the information
716 * in the kernel-format socket structure pointed to by so. This is done
717 * to reduce the spew of irrelevant information over this interface,
718 * to isolate user code from changes in the kernel structure, and
719 * potentially to provide information-hiding if we decide that
720 * some of this information should be hidden from users.
723 sotoxsocket(struct socket *so, struct xsocket *xso)
725 xso->xso_len = sizeof *xso;
727 xso->so_type = so->so_type;
728 xso->so_options = so->so_options;
729 xso->so_linger = so->so_linger;
730 xso->so_state = so->so_state;
731 xso->so_pcb = so->so_pcb;
732 xso->xso_protocol = so->so_proto->pr_protocol;
733 xso->xso_family = so->so_proto->pr_domain->dom_family;
734 xso->so_qlen = so->so_qlen;
735 xso->so_incqlen = so->so_incqlen;
736 xso->so_qlimit = so->so_qlimit;
737 xso->so_timeo = so->so_timeo;
738 xso->so_error = so->so_error;
739 xso->so_pgid = so->so_sigio ? so->so_sigio->sio_pgid : 0;
740 xso->so_oobmark = so->so_oobmark;
741 ssbtoxsockbuf(&so->so_snd, &xso->so_snd);
742 ssbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
743 xso->so_uid = so->so_cred->cr_uid;
747 * Here is the definition of some of the basic objects in the kern.ipc
750 SYSCTL_NODE(_kern, KERN_IPC, ipc, CTLFLAG_RW, 0, "IPC");
753 * This takes the place of kern.maxsockbuf, which moved to kern.ipc.
755 * NOTE! sb_max only applies to user-created socket buffers.
758 SYSCTL_INT(_kern, KERN_DUMMY, dummy, CTLFLAG_RW, &dummy, 0, "");
759 SYSCTL_OID(_kern_ipc, KIPC_MAXSOCKBUF, maxsockbuf, CTLTYPE_INT|CTLFLAG_RW,
760 &sb_max, 0, sysctl_handle_sb_max, "I", "Maximum socket buffer size");
761 SYSCTL_INT(_kern_ipc, OID_AUTO, maxsockets, CTLFLAG_RD,
762 &maxsockets, 0, "Maximum number of sockets available");
763 SYSCTL_INT(_kern_ipc, KIPC_SOCKBUF_WASTE, sockbuf_waste_factor, CTLFLAG_RW,
764 &sb_efficiency, 0, "");
767 * Initialize maxsockets
770 init_maxsockets(void *ignored)
772 TUNABLE_INT_FETCH("kern.ipc.maxsockets", &maxsockets);
773 maxsockets = imax(maxsockets, imax(maxfiles, nmbclusters));
775 SYSINIT(param, SI_BOOT1_TUNABLES, SI_ORDER_ANY,
776 init_maxsockets, NULL);