| // 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 | |
| } |