From e3d188653565da508fb2c0648426ff3f8dfa0b8a Mon Sep 17 00:00:00 2001
From: andre <andre@FreeBSD.org>
Date: Sat, 20 Oct 2012 10:51:32 +0000
Subject: Tidy up somaxconn (accept queue limit) and related functions and move
 it together into one place.

---
 sys/kern/uipc_socket.c | 48 ++++++++++++++++++++++++++----------------------
 1 file changed, 26 insertions(+), 22 deletions(-)

diff --git a/sys/kern/uipc_socket.c b/sys/kern/uipc_socket.c
index b31bdae..6b5581f 100644
--- a/sys/kern/uipc_socket.c
+++ b/sys/kern/uipc_socket.c
@@ -182,15 +182,37 @@ MALLOC_DEFINE(M_PCB, "pcb", "protocol control block");
 	VNET_ASSERT(curvnet != NULL,					\
 	    ("%s:%d curvnet is NULL, so=%p", __func__, __LINE__, (so)));
 
+/*
+ * Limit on the number of connections in the listen queue waiting
+ * for accept(2).
+ */
 static int somaxconn = SOMAXCONN;
-static int sysctl_somaxconn(SYSCTL_HANDLER_ARGS);
-/* XXX: we dont have SYSCTL_USHORT */
+
+static int
+sysctl_somaxconn(SYSCTL_HANDLER_ARGS)
+{
+	int error;
+	int val;
+
+	val = somaxconn;
+	error = sysctl_handle_int(oidp, &val, 0, req);
+	if (error || !req->newptr )
+		return (error);
+
+	if (val < 1 || val > USHRT_MAX)
+		return (EINVAL);
+
+	somaxconn = val;
+	return (0);
+}
 SYSCTL_PROC(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLTYPE_UINT | CTLFLAG_RW,
-    0, sizeof(int), sysctl_somaxconn, "I", "Maximum pending socket connection "
-    "queue size");
+    0, sizeof(int), sysctl_somaxconn, "I",
+    "Maximum listen socket pending connection accept queue size");
+
 static int numopensockets;
 SYSCTL_INT(_kern_ipc, OID_AUTO, numopensockets, CTLFLAG_RD,
     &numopensockets, 0, "Number of open sockets");
+
 #ifdef ZERO_COPY_SOCKETS
 /* These aren't static because they're used in other files. */
 int so_zero_copy_send = 1;
@@ -3269,24 +3291,6 @@ socheckuid(struct socket *so, uid_t uid)
 	return (0);
 }
 
-static int
-sysctl_somaxconn(SYSCTL_HANDLER_ARGS)
-{
-	int error;
-	int val;
-
-	val = somaxconn;
-	error = sysctl_handle_int(oidp, &val, 0, req);
-	if (error || !req->newptr )
-		return (error);
-
-	if (val < 1 || val > USHRT_MAX)
-		return (EINVAL);
-
-	somaxconn = val;
-	return (0);
-}
-
 /*
  * These functions are used by protocols to notify the socket layer (and its
  * consumers) of state changes in the sockets driven by protocol-side events.
-- 
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