| // 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. |
| |
| package net |
| |
| import "syscall" |
| |
| func maxListenerBacklog() int { |
| fd, err := open("/proc/sys/net/core/somaxconn") |
| if err != nil { |
| return syscall.SOMAXCONN |
| } |
| defer fd.close() |
| l, ok := fd.readLine() |
| if !ok { |
| return syscall.SOMAXCONN |
| } |
| f := getFields(l) |
| n, _, ok := dtoi(f[0], 0) |
| if n == 0 || !ok { |
| return syscall.SOMAXCONN |
| } |
| // Linux stores the backlog in a uint16. |
| // Truncate number to avoid wrapping. |
| // See issue 5030. |
| if n > 1<<16-1 { |
| n = 1<<16 - 1 |
| } |
| return n |
| } |
