mirror of
https://github.com/xtaci/kcp-go.git
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75 lines
2.3 KiB
Go
75 lines
2.3 KiB
Go
// The MIT License (MIT)
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//
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// Copyright (c) 2015 xtaci
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//go:build linux
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package kcp
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import (
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"net"
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"os"
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"sync/atomic"
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"github.com/pkg/errors"
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"golang.org/x/net/ipv4"
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)
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// tx is the optimized procedure to transmit packets utilizing the linux sendmmsg system call
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func (s *UDPSession) tx(txqueue []ipv4.Message) {
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// default version
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if s.xconn == nil || s.xconnWriteError != nil {
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s.defaultTx(txqueue)
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return
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}
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// x/net version
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nbytes := 0
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npkts := 0
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for len(txqueue) > 0 {
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if n, err := s.xconn.WriteBatch(txqueue, 0); err == nil {
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for k := range txqueue[:n] {
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nbytes += len(txqueue[k].Buffers[0])
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}
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npkts += n
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txqueue = txqueue[n:]
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} else {
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// compatibility issue:
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// for linux kernel<=2.6.32, support for sendmmsg is not available
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// an error of type os.SyscallError will be returned
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if operr, ok := err.(*net.OpError); ok {
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if se, ok := operr.Err.(*os.SyscallError); ok {
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if se.Syscall == "sendmmsg" {
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s.xconnWriteError = se
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s.defaultTx(txqueue)
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return
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}
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}
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}
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s.notifyWriteError(errors.WithStack(err))
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break
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}
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}
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atomic.AddUint64(&DefaultSnmp.OutPkts, uint64(npkts))
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atomic.AddUint64(&DefaultSnmp.OutBytes, uint64(nbytes))
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}
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