How to use Count method of gvisor Package

Best Syzkaller code snippet using gvisor.Count

tcp.go

Source:tcp.go

...19	defaultWndSize = pool.RelayBufferSize20	// maxConnAttempts specifies the maximum number21	// of in-flight tcp connection attempts.22	maxConnAttempts = 1 << 1023	// tcpKeepaliveCount is the maximum number of24	// TCP keep-alive probes to send before giving up25	// and killing the connection if no response is26	// obtained from the other end.27	tcpKeepaliveCount = 828	// tcpKeepaliveIdle specifies the time a connection29	// must remain idle before the first TCP keepalive30	// packet is sent. Once this time is reached,31	// tcpKeepaliveInterval option is used instead.32	tcpKeepaliveIdle = 60 * time.Second33	// tcpKeepaliveInterval specifies the interval34	// time between sending TCP keepalive packets.35	tcpKeepaliveInterval = 30 * time.Second36)37func withTCPHandler(handle adapter.TCPHandleFunc) option.Option {38	return func(s *stack.Stack) error {39		tcpForwarder := tcp.NewForwarder(s, defaultWndSize, maxConnAttempts, func(r *tcp.ForwarderRequest) {40			var (41				wq  waiter.Queue42				ep  tcpip.Endpoint43				err tcpip.Error44				id  = r.ID()45			)46			defer func() {47				if err != nil {48					log.Warnln("[Stack] forward tcp request %s:%d->%s:%d: %s", id.RemoteAddress, id.RemotePort, id.LocalAddress, id.LocalPort, err)49				}50			}()51			// Perform a TCP three-way handshake.52			ep, err = r.CreateEndpoint(&wq)53			if err != nil {54				// RST: prevent potential half-open TCP connection leak.55				r.Complete(true)56				return57			}58			err = setSocketOptions(s, ep)59			if err != nil {60				ep.Close()61				r.Complete(true)62				return63			}64			defer r.Complete(false)65			conn := &tcpConn{66				TCPConn: gonet.NewTCPConn(&wq, ep),67				id:      id,68			}69			if conn.RemoteAddr() == nil {70				log.Warnln("[STACK] endpoint is not connected, current state: %v", tcp.EndpointState(ep.State()))71				_ = conn.Close()72				return73			}74			handle(conn)75		})76		s.SetTransportProtocolHandler(tcp.ProtocolNumber, tcpForwarder.HandlePacket)77		return nil78	}79}80func setSocketOptions(s *stack.Stack, ep tcpip.Endpoint) tcpip.Error {81	{ /* TCP keepalive options */82		ep.SocketOptions().SetKeepAlive(true)83		idle := tcpip.KeepaliveIdleOption(tcpKeepaliveIdle)84		if err := ep.SetSockOpt(&idle); err != nil {85			return err86		}87		interval := tcpip.KeepaliveIntervalOption(tcpKeepaliveInterval)88		if err := ep.SetSockOpt(&interval); err != nil {89			return err90		}91		if err := ep.SetSockOptInt(tcpip.KeepaliveCountOption, tcpKeepaliveCount); err != nil {92			return err93		}94	}95	{ /* TCP recv/send buffer size */96		var ss tcpip.TCPSendBufferSizeRangeOption97		if err := s.TransportProtocolOption(header.TCPProtocolNumber, &ss); err == nil {98			ep.SocketOptions().SetReceiveBufferSize(int64(ss.Default), false)99		}100		var rs tcpip.TCPReceiveBufferSizeRangeOption101		if err := s.TransportProtocolOption(header.TCPProtocolNumber, &rs); err == nil {102			ep.SocketOptions().SetReceiveBufferSize(int64(rs.Default), false)103		}104	}105	return nil...

netstack_linux.go

Source:netstack_linux.go

...12	"gvisor.dev/gvisor/pkg/tcpip/stack"13	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"14	"gvisor.dev/gvisor/pkg/waiter"15)16func NewNetstack(fd int, mtu uint32, tcpConnHandler func(*net.TCPAddr, func(kaInterval time.Duration, kaCount int) (net.Conn, error), func())) error {17	linkEP, err := fdbased.New(&fdbased.Options{18		FDs: []int{fd},19		MTU: mtu,20	})21	if err != nil {22		return err23	}24	s := stack.New(stack.Options{25		NetworkProtocols:   []stack.NetworkProtocolFactory{ipv4.NewProtocol, ipv6.NewProtocol},26		TransportProtocols: []stack.TransportProtocolFactory{tcp.NewProtocol}})27	if err := s.CreateNIC(1, linkEP); err != nil {28		return fmt.Errorf("create nic fail %v", err)29	}30	s.SetNICForwarding(1, ipv4.ProtocolNumber, true)31	s.SetPromiscuousMode(1, true)32	s.SetSpoofing(1, true)33	subnet, _ := tcpip.NewSubnet(tcpip.Address(strings.Repeat("\x00", 4)),34		tcpip.AddressMask(strings.Repeat("\x00", 4)))35	subnet6, _ := tcpip.NewSubnet(tcpip.Address(strings.Repeat("\x00", 16)),36		tcpip.AddressMask(strings.Repeat("\x00", 16)))37	s.SetRouteTable([]tcpip.Route{38		{39			Destination: subnet,40			NIC:         1,41		},42		{43			Destination: subnet6,44			NIC:         1,45		},46	})47	tcpFwd := tcp.NewForwarder(s, 0, 256, func(r *tcp.ForwarderRequest) {48		id := r.ID()49		remoteAddr := &net.TCPAddr{IP: net.IP(id.LocalAddress), Port: int(id.LocalPort)}50		newConn := func(kaInterval time.Duration, kaCount int) (net.Conn, error) {51			var wq waiter.Queue52			ep, err := r.CreateEndpoint(&wq)53			if err != nil {54				r.Complete(true)55				return nil, fmt.Errorf("netstack create endpoint fail %s", err)56			}57			r.Complete(false)58			ep.SocketOptions().SetKeepAlive(true)59			{60				opt := tcpip.KeepaliveIdleOption(kaInterval)61				ep.SetSockOpt(&opt)62			}63			{64				opt := tcpip.KeepaliveIntervalOption(kaInterval)65				ep.SetSockOpt(&opt)66			}67			ep.SetSockOptInt(tcpip.KeepaliveCountOption, kaCount)68			{69				opt := tcpip.TCPUserTimeoutOption(UserTimeoutFromKeepalive(kaInterval, kaCount))70				ep.SetSockOpt(&opt)71			}72			return gonet.NewTCPConn(&wq, ep), nil73		}74		resetConn := func() { r.Complete(true) }75		tcpConnHandler(remoteAddr, newConn, resetConn)76	})77	s.SetTransportProtocolHandler(tcp.ProtocolNumber, tcpFwd.HandlePacket)78	return nil79}...

Count

Using AI Code Generation

1import (2func main() {3    count = gvisor.Count()4    fmt.Println("Count is = ", count)5}6import (7func main() {8    count = gvisor.Count()9    fmt.Println("Count is = ", count)10}

Count

Using AI Code Generation

1import (2func main() {3 fmt.Println(gvisor.Count())4}5import (6func main() {7 fmt.Println(gvisor.Count())8}

Count

Using AI Code Generation

1import (2func main() {3    fmt.Println("Hello, playground")4    count = gvisor.Count()5    fmt.Println("Count is ", count)6}7import (8func main() {9    fmt.Println("Hello, playground")10    count = gvisor.Count()11    fmt.Println("Count is ", count)12}

Count

Using AI Code Generation

1import (2func main() {3    g := gvisor.New()4    fmt.Println("The count is", g.Count())5}6import (7func main() {8    g := gvisor.New()9    fmt.Println("The count is", g.Count())10    g.Increment()11    fmt.Println("The count is", g.Count())12}13import (14func main() {15    g := gvisor.New()16    fmt.Println("The count is", g.Count())17    g.Decrement()18    fmt.Println("The count is", g.Count())19}20import (21func main() {22    g := gvisor.New()23    fmt.Println("The count is", g.Count())24    g.Increment()25    fmt.Println("The

Count

Using AI Code Generation

1import (2func main() {3	g := gvisor{}4	fmt.Println(g.Count(1, 2))5}6import "fmt"7type Parent struct {8}9func (p Parent) Print() {10	fmt.Println("Parent")11}12type Child struct {13}14func (c Child) Print() {15	fmt.Println("Child")16}17func main() {18	c := Child{}19	c.Print()20}21import "fmt"22type Parent struct {23}24func (p Parent) Print() {25	fmt.Println("Parent")26}27func (p Parent) Print(i int) {28	fmt.Println("Parent", i)29}30func main() {31	p := Parent{}32	p.Print()33	p.Print(10)34}

Count

Using AI Code Generation

1import "fmt"2func main() {3   g.Set(10)4   fmt.Println(g.Count())5}6import "fmt"7type gvisor interface {8   Set(int)9}10type gvisor2 interface {11   Count() int12}13type gvisor3 interface {14}15type gvisor4 struct {16}17func (g *gvisor4) Set(v int) {18}19func (g *gvisor4) Count() int {20}21func main() {22   g = new(gvisor4)23   g.Set(10)24   fmt.Println(g.Count())25}26import "fmt"27type gvisor interface {28   Set(int)29   Count() int30}31type gvisor2 struct {32}33func (g *gvisor2) Set(v int) {34}35func (g *gvisor2) Count() int {36}37func main() {38   var g interface {39      Set(int)40      Count() int41   }42   g = new(gvisor2)43   g.Set(10)44   fmt.Println(g.Count())45}46import "fmt"47func main() {48   var g interface{}49   fmt.Println(g)

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