diff options
Diffstat (limited to 'vendor/github.com/xtaci/kcp-go/v5/readloop_linux.go')
-rw-r--r-- | vendor/github.com/xtaci/kcp-go/v5/readloop_linux.go | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/vendor/github.com/xtaci/kcp-go/v5/readloop_linux.go b/vendor/github.com/xtaci/kcp-go/v5/readloop_linux.go new file mode 100644 index 0000000..be194af --- /dev/null +++ b/vendor/github.com/xtaci/kcp-go/v5/readloop_linux.go @@ -0,0 +1,111 @@ +// +build linux + +package kcp + +import ( + "net" + "os" + "sync/atomic" + + "github.com/pkg/errors" + "golang.org/x/net/ipv4" + "golang.org/x/net/ipv6" +) + +// the read loop for a client session +func (s *UDPSession) readLoop() { + // default version + if s.xconn == nil { + s.defaultReadLoop() + return + } + + // x/net version + var src string + msgs := make([]ipv4.Message, batchSize) + for k := range msgs { + msgs[k].Buffers = [][]byte{make([]byte, mtuLimit)} + } + + for { + if count, err := s.xconn.ReadBatch(msgs, 0); err == nil { + for i := 0; i < count; i++ { + msg := &msgs[i] + // make sure the packet is from the same source + if src == "" { // set source address if nil + src = msg.Addr.String() + } else if msg.Addr.String() != src { + atomic.AddUint64(&DefaultSnmp.InErrs, 1) + continue + } + + // source and size has validated + s.packetInput(msg.Buffers[0][:msg.N]) + } + } else { + // compatibility issue: + // for linux kernel<=2.6.32, support for sendmmsg is not available + // an error of type os.SyscallError will be returned + if operr, ok := err.(*net.OpError); ok { + if se, ok := operr.Err.(*os.SyscallError); ok { + if se.Syscall == "recvmmsg" { + s.defaultReadLoop() + return + } + } + } + s.notifyReadError(errors.WithStack(err)) + return + } + } +} + +// monitor incoming data for all connections of server +func (l *Listener) monitor() { + var xconn batchConn + if _, ok := l.conn.(*net.UDPConn); ok { + addr, err := net.ResolveUDPAddr("udp", l.conn.LocalAddr().String()) + if err == nil { + if addr.IP.To4() != nil { + xconn = ipv4.NewPacketConn(l.conn) + } else { + xconn = ipv6.NewPacketConn(l.conn) + } + } + } + + // default version + if xconn == nil { + l.defaultMonitor() + return + } + + // x/net version + msgs := make([]ipv4.Message, batchSize) + for k := range msgs { + msgs[k].Buffers = [][]byte{make([]byte, mtuLimit)} + } + + for { + if count, err := xconn.ReadBatch(msgs, 0); err == nil { + for i := 0; i < count; i++ { + msg := &msgs[i] + l.packetInput(msg.Buffers[0][:msg.N], msg.Addr) + } + } else { + // compatibility issue: + // for linux kernel<=2.6.32, support for sendmmsg is not available + // an error of type os.SyscallError will be returned + if operr, ok := err.(*net.OpError); ok { + if se, ok := operr.Err.(*os.SyscallError); ok { + if se.Syscall == "recvmmsg" { + l.defaultMonitor() + return + } + } + } + l.notifyReadError(errors.WithStack(err)) + return + } + } +} |