net: make use of the kernel state to listen on TCP, Unix
R=golang-dev, dave, minux.ma
CC=golang-dev
https://golang.org/cl/5545044
diff --git a/src/pkg/net/sock_bsd.go b/src/pkg/net/sock_bsd.go
new file mode 100644
index 0000000..630a91ed
--- /dev/null
+++ b/src/pkg/net/sock_bsd.go
@@ -0,0 +1,33 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin freebsd netbsd openbsd
+
+// Sockets for BSD variants
+
+package net
+
+import (
+ "runtime"
+ "syscall"
+)
+
+func maxListenerBacklog() int {
+ var (
+ n uint32
+ err error
+ )
+ switch runtime.GOOS {
+ case "darwin", "freebsd":
+ n, err = syscall.SysctlUint32("kern.ipc.somaxconn")
+ case "netbsd":
+ // NOTE: NetBSD has no somaxconn-like kernel state so far
+ case "openbsd":
+ n, err = syscall.SysctlUint32("kern.somaxconn")
+ }
+ if n == 0 || err != nil {
+ return syscall.SOMAXCONN
+ }
+ return int(n)
+}
