1/*
2 * Copyright (c) 1982, 1986, 1988, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94
34 * $FreeBSD: head/sys/kern/uipc_socket.c 84472 2001-10-04 13:11:48Z dwmalone $
35 */
36
37#include "opt_inet.h"
38
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/fcntl.h>
42#include <sys/lock.h>

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87MALLOC_DEFINE(M_PCB, "pcb", "protocol control block");
88
89SYSCTL_DECL(_kern_ipc);
90
91static int somaxconn = SOMAXCONN;
92SYSCTL_INT(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLFLAG_RW,
93 &somaxconn, 0, "Maximum pending socket connection queue size");
94
95/*
96 * Socket operation routines.
97 * These routines are called by the routines in
98 * sys_socket.c or from a system process, and
99 * implement the semantics of socket operations by
100 * switching out to the protocol specific routines.
101 */
102

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1639static int
1640filt_solisten(struct knote *kn, long hint)
1641{
1642 struct socket *so = (struct socket *)kn->kn_fp->f_data;
1643
1644 kn->kn_data = so->so_qlen - so->so_incqlen;
1645 return (! TAILQ_EMPTY(&so->so_comp));
1646}