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Source file src/net/sock_linux.go

Documentation: net

  // 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])
  	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
  }
  

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