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.
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7 * modification, are permitted provided that the following conditions
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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
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19 * may be used to endorse or promote products derived from this software
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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/socketops.h>
54 #include <sys/signalvar.h>
55 #include <sys/sysctl.h>
56 #include <sys/aio.h> /* for aio_swake proto */
57 #include <sys/event.h>
59 #include <sys/thread2.h>
60 #include <sys/msgport2.h>
61 #include <sys/socketvar2.h>
66 * Primitive routines for operating on sockets and socket buffers
69 u_long sb_max = SB_MAX;
71 SB_MAX * MCLBYTES / (MSIZE + MCLBYTES); /* adjusted sb_max */
73 static u_long sb_efficiency = 8; /* parameter for sbreserve() */
75 /************************************************************************
76 * signalsockbuf procedures *
77 ************************************************************************/
80 * Wait for data to arrive at/drain from a socket buffer.
82 * NOTE: Caller must generally hold the ssb_lock (client side lock) since
83 * WAIT/WAKEUP only works for one client at a time.
85 * NOTE: Caller always retries whatever operation it was waiting on.
88 ssb_wait(struct signalsockbuf *ssb)
94 pflags = (ssb->ssb_flags & SSB_NOINTR) ? 0 : PCATCH;
97 flags = ssb->ssb_flags;
101 * WAKEUP and WAIT interlock eachother. We can catch the
102 * race by checking to see if WAKEUP has already been set,
103 * and only setting WAIT if WAKEUP is clear.
105 if (flags & SSB_WAKEUP) {
106 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
107 flags & ~SSB_WAKEUP)) {
115 * Only set WAIT if WAKEUP is clear.
117 tsleep_interlock(&ssb->ssb_cc, pflags);
118 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
120 error = tsleep(&ssb->ssb_cc, pflags | PINTERLOCKED,
121 "sbwait", ssb->ssb_timeo);
129 * Lock a sockbuf already known to be locked;
130 * return any error returned from sleep (EINTR).
133 _ssb_lock(struct signalsockbuf *ssb)
139 pflags = (ssb->ssb_flags & SSB_NOINTR) ? 0 : PCATCH;
142 flags = ssb->ssb_flags;
144 if (flags & SSB_LOCK) {
145 tsleep_interlock(&ssb->ssb_flags, pflags);
146 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
148 error = tsleep(&ssb->ssb_flags,
149 pflags | PINTERLOCKED,
155 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
157 lwkt_gettoken(&ssb->ssb_token);
167 * This does the same for sockbufs. Note that the xsockbuf structure,
168 * since it is always embedded in a socket, does not include a self
169 * pointer nor a length. We make this entry point public in case
170 * some other mechanism needs it.
173 ssbtoxsockbuf(struct signalsockbuf *ssb, struct xsockbuf *xsb)
175 xsb->sb_cc = ssb->ssb_cc;
176 xsb->sb_hiwat = ssb->ssb_hiwat;
177 xsb->sb_mbcnt = ssb->ssb_mbcnt;
178 xsb->sb_mbmax = ssb->ssb_mbmax;
179 xsb->sb_lowat = ssb->ssb_lowat;
180 xsb->sb_flags = ssb->ssb_flags;
181 xsb->sb_timeo = ssb->ssb_timeo;
185 /************************************************************************
186 * Procedures which manipulate socket state flags, wakeups, etc. *
187 ************************************************************************
189 * Normal sequence from the active (originating) side is that
190 * soisconnecting() is called during processing of connect() call, resulting
191 * in an eventual call to soisconnected() if/when the connection is
192 * established. When the connection is torn down soisdisconnecting() is
193 * called during processing of disconnect() call, and soisdisconnected() is
194 * called when the connection to the peer is totally severed.
196 * The semantics of these routines are such that connectionless protocols
197 * can call soisconnected() and soisdisconnected() only, bypassing the
198 * in-progress calls when setting up a ``connection'' takes no time.
200 * From the passive side, a socket is created with two queues of sockets:
201 * so_incomp for connections in progress and so_comp for connections
202 * already made and awaiting user acceptance. As a protocol is preparing
203 * incoming connections, it creates a socket structure queued on so_incomp
204 * by calling sonewconn(). When the connection is established,
205 * soisconnected() is called, and transfers the socket structure to so_comp,
206 * making it available to accept().
208 * If a socket is closed with sockets on either so_incomp or so_comp, these
209 * sockets are dropped.
211 * If higher level protocols are implemented in the kernel, the wakeups
212 * done here will sometimes cause software-interrupt process scheduling.
216 soisconnecting(struct socket *so)
218 soclrstate(so, SS_ISCONNECTED | SS_ISDISCONNECTING);
219 sosetstate(so, SS_ISCONNECTING);
223 soisconnected(struct socket *so)
227 while ((head = so->so_head) != NULL) {
228 lwkt_getpooltoken(head);
229 if (so->so_head == head)
231 lwkt_relpooltoken(head);
234 soclrstate(so, SS_ISCONNECTING | SS_ISDISCONNECTING | SS_ISCONFIRMING);
235 sosetstate(so, SS_ISCONNECTED);
236 if (head && (so->so_state & SS_INCOMP)) {
237 if ((so->so_options & SO_ACCEPTFILTER) != 0) {
238 so->so_upcall = head->so_accf->so_accept_filter->accf_callback;
239 so->so_upcallarg = head->so_accf->so_accept_filter_arg;
240 atomic_set_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
241 so->so_options &= ~SO_ACCEPTFILTER;
242 so->so_upcall(so, so->so_upcallarg, 0);
243 lwkt_relpooltoken(head);
248 * Listen socket are not per-cpu.
250 TAILQ_REMOVE(&head->so_incomp, so, so_list);
252 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
254 sosetstate(so, SS_COMP);
255 soclrstate(so, SS_INCOMP);
258 * XXX head may be on a different protocol thread.
259 * sorwakeup()->sowakeup() is hacked atm.
262 wakeup_one(&head->so_timeo);
264 wakeup(&so->so_timeo);
269 lwkt_relpooltoken(head);
273 soisdisconnecting(struct socket *so)
275 soclrstate(so, SS_ISCONNECTING);
276 sosetstate(so, SS_ISDISCONNECTING | SS_CANTRCVMORE | SS_CANTSENDMORE);
277 wakeup((caddr_t)&so->so_timeo);
283 soisdisconnected(struct socket *so)
285 soclrstate(so, SS_ISCONNECTING | SS_ISCONNECTED | SS_ISDISCONNECTING);
286 sosetstate(so, SS_CANTRCVMORE | SS_CANTSENDMORE | SS_ISDISCONNECTED);
287 wakeup((caddr_t)&so->so_timeo);
288 sbdrop(&so->so_snd.sb, so->so_snd.ssb_cc);
294 soisreconnecting(struct socket *so)
296 soclrstate(so, SS_ISDISCONNECTING | SS_ISDISCONNECTED |
297 SS_CANTRCVMORE | SS_CANTSENDMORE);
298 sosetstate(so, SS_ISCONNECTING);
302 soisreconnected(struct socket *so)
304 soclrstate(so, SS_ISDISCONNECTED | SS_CANTRCVMORE | SS_CANTSENDMORE);
309 * Set or change the message port a socket receives commands on.
314 sosetport(struct socket *so, lwkt_port_t port)
320 * When an attempt at a new connection is noted on a socket
321 * which accepts connections, sonewconn is called. If the
322 * connection is possible (subject to space constraints, etc.)
323 * then we allocate a new structure, propoerly linked into the
324 * data structure of the original socket, and return this.
325 * Connstatus may be 0, or SO_ISCONFIRMING, or SO_ISCONNECTED.
327 * The new socket is returned with one ref and so_pcb assigned.
328 * The reference is implied by so_pcb.
331 sonewconn(struct socket *head, int connstatus)
335 struct pru_attach_info ai;
337 if (head->so_qlen > 3 * head->so_qlimit / 2)
344 * Set the port prior to attaching the inpcb to the current
345 * cpu's protocol thread (which should be the current thread
346 * but might not be in all cases). This serializes any pcb ops
347 * which occur to our cpu allowing us to complete the attachment
348 * without racing anything.
350 sosetport(so, cpu_portfn(mycpu->gd_cpuid));
351 if ((head->so_options & SO_ACCEPTFILTER) != 0)
354 so->so_type = head->so_type;
355 so->so_options = head->so_options &~ SO_ACCEPTCONN;
356 so->so_linger = head->so_linger;
359 * NOTE: Clearing NOFDREF implies referencing the so with
362 so->so_state = head->so_state | SS_NOFDREF | SS_ASSERTINPROG;
363 so->so_proto = head->so_proto;
364 so->so_cred = crhold(head->so_cred);
367 ai.fd_rdir = NULL; /* jail code cruft XXX JH */
370 * Reserve space and call pru_attach. We can direct-call the
371 * function since we're already in the protocol thread.
373 if (soreserve(so, head->so_snd.ssb_hiwat,
374 head->so_rcv.ssb_hiwat, NULL) ||
375 so_pru_attach_direct(so, 0, &ai)) {
377 soclrstate(so, SS_ASSERTINPROG);
378 sofree(so); /* remove implied pcb ref */
381 KKASSERT(so->so_refs == 2); /* attach + our base ref */
383 KKASSERT(so->so_port != NULL);
384 so->so_rcv.ssb_lowat = head->so_rcv.ssb_lowat;
385 so->so_snd.ssb_lowat = head->so_snd.ssb_lowat;
386 so->so_rcv.ssb_timeo = head->so_rcv.ssb_timeo;
387 so->so_snd.ssb_timeo = head->so_snd.ssb_timeo;
388 so->so_rcv.ssb_flags |= head->so_rcv.ssb_flags &
389 (SSB_AUTOSIZE | SSB_AUTOLOWAT);
390 so->so_snd.ssb_flags |= head->so_snd.ssb_flags &
391 (SSB_AUTOSIZE | SSB_AUTOLOWAT);
392 lwkt_getpooltoken(head);
394 TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
395 sosetstate(so, SS_COMP);
398 if (head->so_incqlen > head->so_qlimit) {
399 sp = TAILQ_FIRST(&head->so_incomp);
400 TAILQ_REMOVE(&head->so_incomp, sp, so_list);
402 soclrstate(sp, SS_INCOMP);
406 TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list);
407 sosetstate(so, SS_INCOMP);
410 lwkt_relpooltoken(head);
413 * XXX head may be on a different protocol thread.
414 * sorwakeup()->sowakeup() is hacked atm.
417 wakeup((caddr_t)&head->so_timeo);
418 sosetstate(so, connstatus);
420 soclrstate(so, SS_ASSERTINPROG);
425 * Socantsendmore indicates that no more data will be sent on the
426 * socket; it would normally be applied to a socket when the user
427 * informs the system that no more data is to be sent, by the protocol
428 * code (in case PRU_SHUTDOWN). Socantrcvmore indicates that no more data
429 * will be received, and will normally be applied to the socket by a
430 * protocol when it detects that the peer will send no more data.
431 * Data queued for reading in the socket may yet be read.
434 socantsendmore(struct socket *so)
436 sosetstate(so, SS_CANTSENDMORE);
441 socantrcvmore(struct socket *so)
443 sosetstate(so, SS_CANTRCVMORE);
448 * Wakeup processes waiting on a socket buffer. Do asynchronous notification
449 * via SIGIO if the socket has the SS_ASYNC flag set.
451 * For users waiting on send/recv try to avoid unnecessary context switch
452 * thrashing. Particularly for senders of large buffers (needs to be
453 * extended to sel and aio? XXX)
455 * WARNING! Can be called on a foreign socket from the wrong protocol
456 * thread. aka is called on the 'head' listen socket when
457 * a new connection comes in.
460 sowakeup(struct socket *so, struct signalsockbuf *ssb)
462 struct kqinfo *kqinfo = &ssb->ssb_kq;
466 * Check conditions, set the WAKEUP flag, and clear and signal if
467 * the WAIT flag is found to be set. This interlocks against the
471 flags = ssb->ssb_flags;
474 if ((ssb == &so->so_snd && ssb_space(ssb) >= ssb->ssb_lowat) ||
475 (ssb == &so->so_rcv && ssb->ssb_cc >= ssb->ssb_lowat) ||
476 (ssb == &so->so_snd && (so->so_state & SS_CANTSENDMORE)) ||
477 (ssb == &so->so_rcv && (so->so_state & SS_CANTRCVMORE))
479 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
480 (flags | SSB_WAKEUP) & ~SSB_WAIT)) {
481 if (flags & SSB_WAIT)
482 wakeup(&ssb->ssb_cc);
493 if ((so->so_state & SS_ASYNC) && so->so_sigio != NULL)
494 pgsigio(so->so_sigio, SIGIO, 0);
495 if (ssb->ssb_flags & SSB_UPCALL)
496 (*so->so_upcall)(so, so->so_upcallarg, MB_DONTWAIT);
497 if (ssb->ssb_flags & SSB_AIO)
499 KNOTE(&kqinfo->ki_note, 0);
502 * This is a bit of a hack. Multiple threads can wind up scanning
503 * ki_mlist concurrently due to the fact that this function can be
504 * called on a foreign socket, so we can't afford to block here.
506 * We need the pool token for (so) (likely the listne socket if
507 * SSB_MEVENT is set) because the predicate function may have
508 * to access the accept queue.
510 if (ssb->ssb_flags & SSB_MEVENT) {
511 struct netmsg_so_notify *msg, *nmsg;
513 lwkt_gettoken(&kq_token);
514 lwkt_getpooltoken(so);
515 TAILQ_FOREACH_MUTABLE(msg, &kqinfo->ki_mlist, nm_list, nmsg) {
516 if (msg->nm_predicate(msg)) {
517 TAILQ_REMOVE(&kqinfo->ki_mlist, msg, nm_list);
518 lwkt_replymsg(&msg->base.lmsg,
519 msg->base.lmsg.ms_error);
522 if (TAILQ_EMPTY(&ssb->ssb_kq.ki_mlist))
523 atomic_clear_int(&ssb->ssb_flags, SSB_MEVENT);
524 lwkt_relpooltoken(so);
525 lwkt_reltoken(&kq_token);
530 * Socket buffer (struct signalsockbuf) utility routines.
532 * Each socket contains two socket buffers: one for sending data and
533 * one for receiving data. Each buffer contains a queue of mbufs,
534 * information about the number of mbufs and amount of data in the
535 * queue, and other fields allowing kevent()/select()/poll() statements
536 * and notification on data availability to be implemented.
538 * Data stored in a socket buffer is maintained as a list of records.
539 * Each record is a list of mbufs chained together with the m_next
540 * field. Records are chained together with the m_nextpkt field. The upper
541 * level routine soreceive() expects the following conventions to be
542 * observed when placing information in the receive buffer:
544 * 1. If the protocol requires each message be preceded by the sender's
545 * name, then a record containing that name must be present before
546 * any associated data (mbuf's must be of type MT_SONAME).
547 * 2. If the protocol supports the exchange of ``access rights'' (really
548 * just additional data associated with the message), and there are
549 * ``rights'' to be received, then a record containing this data
550 * should be present (mbuf's must be of type MT_RIGHTS).
551 * 3. If a name or rights record exists, then it must be followed by
552 * a data record, perhaps of zero length.
554 * Before using a new socket structure it is first necessary to reserve
555 * buffer space to the socket, by calling sbreserve(). This should commit
556 * some of the available buffer space in the system buffer pool for the
557 * socket (currently, it does nothing but enforce limits). The space
558 * should be released by calling ssb_release() when the socket is destroyed.
561 soreserve(struct socket *so, u_long sndcc, u_long rcvcc, struct rlimit *rl)
563 if (so->so_snd.ssb_lowat == 0)
564 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOLOWAT);
565 if (ssb_reserve(&so->so_snd, sndcc, so, rl) == 0)
567 if (ssb_reserve(&so->so_rcv, rcvcc, so, rl) == 0)
569 if (so->so_rcv.ssb_lowat == 0)
570 so->so_rcv.ssb_lowat = 1;
571 if (so->so_snd.ssb_lowat == 0)
572 so->so_snd.ssb_lowat = MCLBYTES;
573 if (so->so_snd.ssb_lowat > so->so_snd.ssb_hiwat)
574 so->so_snd.ssb_lowat = so->so_snd.ssb_hiwat;
577 ssb_release(&so->so_snd, so);
583 sysctl_handle_sb_max(SYSCTL_HANDLER_ARGS)
586 u_long old_sb_max = sb_max;
588 error = SYSCTL_OUT(req, arg1, sizeof(int));
589 if (error || !req->newptr)
591 error = SYSCTL_IN(req, arg1, sizeof(int));
594 if (sb_max < MSIZE + MCLBYTES) {
598 sb_max_adj = (u_quad_t)sb_max * MCLBYTES / (MSIZE + MCLBYTES);
603 * Allot mbufs to a signalsockbuf.
605 * Attempt to scale mbmax so that mbcnt doesn't become limiting
606 * if buffering efficiency is near the normal case.
608 * sb_max only applies to user-sockets (where rl != NULL). It does
609 * not apply to kernel sockets or kernel-controlled sockets. Note
610 * that NFS overrides the sockbuf limits created when nfsd creates
614 ssb_reserve(struct signalsockbuf *ssb, u_long cc, struct socket *so,
618 * rl will only be NULL when we're in an interrupt (eg, in tcp_input)
619 * or when called from netgraph (ie, ngd_attach)
621 if (rl && cc > sb_max_adj)
623 if (!chgsbsize(so->so_cred->cr_uidinfo, &ssb->ssb_hiwat, cc,
624 rl ? rl->rlim_cur : RLIM_INFINITY)) {
628 ssb->ssb_mbmax = min(cc * sb_efficiency, sb_max);
630 ssb->ssb_mbmax = cc * sb_efficiency;
633 * AUTOLOWAT is set on send buffers and prevents large writes
634 * from generating a huge number of context switches.
636 if (ssb->ssb_flags & SSB_AUTOLOWAT) {
637 ssb->ssb_lowat = ssb->ssb_hiwat / 2;
638 if (ssb->ssb_lowat < MCLBYTES)
639 ssb->ssb_lowat = MCLBYTES;
641 if (ssb->ssb_lowat > ssb->ssb_hiwat)
642 ssb->ssb_lowat = ssb->ssb_hiwat;
647 * Free mbufs held by a socket, and reserved mbuf space.
650 ssb_release(struct signalsockbuf *ssb, struct socket *so)
653 (void)chgsbsize(so->so_cred->cr_uidinfo, &ssb->ssb_hiwat, 0,
659 * Some routines that return EOPNOTSUPP for entry points that are not
660 * supported by a protocol. Fill in as needed.
663 pr_generic_notsupp(netmsg_t msg)
665 lwkt_replymsg(&msg->lmsg, EOPNOTSUPP);
669 pru_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio,
670 struct mbuf *top, struct mbuf *control, int flags,
681 pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
682 struct uio *uio, struct sockbuf *sio,
683 struct mbuf **controlp, int *flagsp)
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(netmsg_t msg)
695 msg->sense.nm_stat->st_blksize = msg->base.nm_so->so_snd.ssb_hiwat;
696 lwkt_replymsg(&msg->lmsg, 0);
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);