51 lines
1.1 KiB
Go
51 lines
1.1 KiB
Go
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// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin dragonfly freebsd linux netbsd openbsd
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package ipv4
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import (
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"net"
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"reflect"
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)
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func (c *genericOpt) sysfd() (int, error) {
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switch p := c.Conn.(type) {
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case *net.TCPConn, *net.UDPConn, *net.IPConn:
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return sysfd(p)
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}
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return 0, errInvalidConnType
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}
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func (c *dgramOpt) sysfd() (int, error) {
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switch p := c.PacketConn.(type) {
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case *net.UDPConn, *net.IPConn:
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return sysfd(p.(net.Conn))
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}
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return 0, errInvalidConnType
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}
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func (c *payloadHandler) sysfd() (int, error) {
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return sysfd(c.PacketConn.(net.Conn))
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}
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func (c *packetHandler) sysfd() (int, error) {
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return sysfd(c.c)
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}
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func sysfd(c net.Conn) (int, error) {
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cv := reflect.ValueOf(c)
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switch ce := cv.Elem(); ce.Kind() {
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case reflect.Struct:
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netfd := ce.FieldByName("conn").FieldByName("fd")
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switch fe := netfd.Elem(); fe.Kind() {
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case reflect.Struct:
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fd := fe.FieldByName("sysfd")
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return int(fd.Int()), nil
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}
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}
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return 0, errInvalidConnType
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}
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