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Source file src/net/sock_linux.go

     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	

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