Unlock 30% off on Manual Testing Annual Plans this Holiday Season.

Copied to Clipboard!

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)

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.