1 // Copyright 2009 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package net 6 7 import "syscall" 8 9 func maxListenerBacklog() int { 10 fd, err := open("/proc/sys/net/core/somaxconn") 11 if err != nil { 12 return syscall.SOMAXCONN 13 } 14 defer fd.close() 15 l, ok := fd.readLine() 16 if !ok { 17 return syscall.SOMAXCONN 18 } 19 f := getFields(l) 20 n, _, ok := dtoi(f[0]) 21 if n == 0 || !ok { 22 return syscall.SOMAXCONN 23 } 24 // Linux stores the backlog in a uint16. 25 // Truncate number to avoid wrapping. 26 // See issue 5030. 27 if n > 1<<16-1 { 28 n = 1<<16 - 1 29 } 30 return n 31 } 32
