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How to use waitForOutput method of vm Package

Best Syzkaller code snippet using vm.waitForOutput

vm.go

Source:vm.go

...233				mon.output = append(mon.output, "DIAGNOSIS:\n"...)234				mon.output = append(mon.output, diag...)235			}236			if wait {237				mon.waitForOutput()238			}239			rep := &report.Report{240				Title:      noOutputCrash,241				Output:     mon.output,242				Suppressed: report.IsSuppressed(mon.reporter, mon.output),243			}244			return rep245		case <-Shutdown:246			return nil247		}248	}249}250type monitor struct {251	inst     *Instance252	outc     <-chan []byte253	errc     <-chan error254	reporter report.Reporter255	exit     ExitCondition256	output   []byte257	matchPos int258}259func (mon *monitor) extractError(defaultError string) *report.Report {260	var diagOutput []byte261	appendDiagOutput := func() {262		if len(diagOutput) > 0 {263			mon.output = append(mon.output, report.VMDiagnosisStart...)264			mon.output = append(mon.output, diagOutput...)265		}266	}267	if defaultError != "" {268		// N.B. we always wait below for other errors.269		diagOutput, _ = mon.inst.Diagnose()270	}271	// Give it some time to finish writing the error message.272	mon.waitForOutput()273	if bytes.Contains(mon.output, []byte(fuzzerPreemptedStr)) {274		return nil275	}276	if !mon.reporter.ContainsCrash(mon.output[mon.matchPos:]) {277		if defaultError == "" {278			return nil279		}280		appendDiagOutput()281		rep := &report.Report{282			Title:      defaultError,283			Output:     mon.output,284			Suppressed: report.IsSuppressed(mon.reporter, mon.output),285		}286		return rep287	}288	if defaultError == "" {289		wait := false290		diagOutput, wait = mon.inst.Diagnose()291		if wait {292			mon.waitForOutput()293		}294	}295	appendDiagOutput()296	rep := mon.reporter.Parse(mon.output[mon.matchPos:])297	if rep == nil {298		panic(fmt.Sprintf("reporter.ContainsCrash/Parse disagree:\n%s", mon.output[mon.matchPos:]))299	}300	start := mon.matchPos + rep.StartPos - beforeContext301	if start < 0 {302		start = 0303	}304	end := mon.matchPos + rep.EndPos + afterContext305	if end > len(mon.output) {306		end = len(mon.output)307	}308	rep.Output = mon.output[start:end]309	rep.StartPos += mon.matchPos - start310	rep.EndPos += mon.matchPos - start311	return rep312}313func (mon *monitor) waitForOutput() {314	timer := time.NewTimer(waitForOutputTimeout)315	defer timer.Stop()316	for {317		select {318		case out, ok := <-mon.outc:319			if !ok {320				return321			}322			mon.output = append(mon.output, out...)323		case <-timer.C:324			return325		case <-Shutdown:326			return327		}328	}329}330const (331	maxErrorLength = 256332	lostConnectionCrash  = "lost connection to test machine"333	noOutputCrash        = "no output from test machine"334	timeoutCrash         = "timed out"335	executingProgramStr1 = "executing program"  // syz-fuzzer output336	executingProgramStr2 = "executed programs:" // syz-execprog output337	fuzzerPreemptedStr   = "SYZ-FUZZER: PREEMPTED"338)339var (340	executingProgram1 = []byte(executingProgramStr1)341	executingProgram2 = []byte(executingProgramStr2)342	beforeContext = 1024 << 10343	afterContext  = 128 << 10344	NoOutputTimeout      = 5 * time.Minute345	tickerPeriod         = 10 * time.Second346	waitForOutputTimeout = 10 * time.Second347)...

start_crosvm.go

Source:start_crosvm.go

1// Copyright 2018 The Chromium OS Authors. All rights reserved.2// Use of this source code is governed by a BSD-style license that can be3// found in the LICENSE file.4package vm5import (6	"context"7	"io"8	"regexp"9	"time"10	"chromiumos/tast/errors"11	"chromiumos/tast/local/sysutil"12	"chromiumos/tast/local/vm"13	"chromiumos/tast/testing"14)15func init() {16	testing.AddTest(&testing.Test{17		Func:         StartCrosvm,18		Desc:         "Checks that crosvm starts termina and runs commands through stdin",19		Contacts:     []string{"smbarber@chromium.org", "crosvm-dev@google.com"},20		Attr:         []string{"group:mainline", "informational"},21		SoftwareDeps: []string{"vm_host"},22		// TODO(smbarber): Download only files for the current architecture.23		Data: []string{24			"termina_kernel_aarch64",25			"termina_kernel_x86_64",26			"termina_rootfs_aarch64.img",27			"termina_rootfs_x86_64.img",28		},29	})30}31func StartCrosvm(ctx context.Context, s *testing.State) {32	kernelName, rootfsName, err := vmDataName(ctx)33	if err != nil {34		s.Fatal("Failed to find VM image: ", err)35	}36	kernelPath := s.DataPath(kernelName)37	rootfsPath := s.DataPath(rootfsName)38	cvm, err := vm.NewCrosvm(ctx, &vm.CrosvmParams{39		VMKernel:   kernelPath,40		RootfsPath: rootfsPath,41		KernelArgs: []string{"init=/bin/bash"},42	})43	if err != nil {44		s.Fatal("Failed to start crosvm: ", err)45	}46	defer cvm.Close(ctx)47	testing.ContextLog(ctx, "Waiting for VM to boot")48	startCtx, cancel := context.WithTimeout(ctx, 20*time.Second)49	defer cancel()50	line, err := cvm.WaitForOutput(startCtx, regexp.MustCompile("localhost\\b.*#"))51	if err != nil {52		s.Fatal("Didn't get VM prompt: ", err)53	}54	s.Logf("Saw prompt in line %q", line)55	const cmd = "/bin/ls -1 /"56	s.Logf("Running %q and waiting for output", cmd)57	if _, err = io.WriteString(cvm.Stdin(), cmd+"\n"); err != nil {58		s.Fatalf("Failed to write %q command: %v", cmd, err)59	}60	cmdCtx, cancel := context.WithTimeout(ctx, 5*time.Second)61	defer cancel()62	if line, err = cvm.WaitForOutput(cmdCtx, regexp.MustCompile("^sbin$")); err != nil {63		s.Errorf("Didn't get expected %q output: %v", cmd, err)64	} else {65		s.Logf("Saw line %q", line)66	}67}68// vmDataName returns the name of the VM kernel and rootfs files to use for the current architecture.69func vmDataName(ctx context.Context) (string, string, error) {70	u, err := sysutil.Uname()71	if err != nil {72		return "", "", errors.Wrap(err, "failed to get uname")73	}74	if u.Machine == "aarch64" {75		return "termina_kernel_aarch64", "termina_rootfs_aarch64.img", nil76	} else if u.Machine == "x86_64" {77		return "termina_kernel_x86_64", "termina_rootfs_x86_64.img", nil78	}79	return "", "", errors.Errorf("no known VM image for architecture %q", u.Machine)80}...

waitForOutput

Using AI Code Generation

1import (2func main() {3	if err != nil {4		log.Fatal(err)5	}6	auth, err := bind.NewTransactor(strings.NewReader(keyJSON), "your_password")7	if err != nil {8		log.Fatal(err)9	}

waitForOutput

Using AI Code Generation

1import (2func main() {3	if err != nil {4		log.Fatal(err)5	}6	txHash := common.HexToHash("0x9d9e3c3f2e2c5b5f7e0f0e5d8c1c0b9e9f9d9f9b9d9e9f9b9e9d9e9f9d9e9f9e")7	if err != nil {8		log.Fatal(err)9	}10	filterQuery := ethereum.FilterQuery{11		FromBlock: big.NewInt(0),12		ToBlock:   big.NewInt(0),13		Addresses: []common.Address{common.HexToAddress("0x9a4d4d4f4c4a4e4f4e4d4d4e4f4e4d4d4e4d4d4")},14		Topics:    [][]common.Hash{{common.HexToHash("0x9d9e3c3f2e2c5b5f7e0f0e5d8c1c0b9e9f9d9f9b9d9e9f9b9e9d9e9f9d9e9f9e")}},15	}16	filter, err := rpcClient.EthSubscribe(context.Background(), "logs", filterQuery)17	if err != nil {18		log.Fatal(err)19	}20	ch := make(chan *types.Log

waitForOutput

Using AI Code Generation

1import (2func main() {3    db, _ := ethdb.NewMemDatabase()4    statedb, _ := state.New(common.Hash{}, state.NewDatabase(db))5    vmenv := vm.NewEVM(vm.Context{}, statedb, params.TestChainConfig, vm.Config{})6    addr := crypto.PubkeyToAddress(*crypto.GenerateKey().PubKey)7    contract := vm.NewContract(vm.AccountRef(addr), vm.AccountRef(addr), new(big.Int), 100000)8    contract.SetCallCode(&addr, crypto.Keccak256Hash([]byte("returnSum(uint256,uint256)")), []byte("returnSum(uint256,uint256){return a+b}"))9    input, _ := rlp.EncodeToBytes([]interface{}{big.NewInt(5), big.NewInt(7)})10    ret, err := vmenv.Run(contract, input, false)11    if err != nil {12        fmt.Println("An error occurred:", err)13    }14    fmt.Println("Return Value:", ret)15}16import (

waitForOutput

Using AI Code Generation

1public class Main {2    public static void main(String[] args) {3        VirtualMachine vm = new VirtualMachine();4        vm.waitForOutput();5    }6}

waitForOutput

Using AI Code Generation

1import java.util.*;2import java.io.*;3import java.net.*;4import java.nio.*;5import java.nio.file.*;6import java.nio.charset.*;7public class Main {8	public static void main(String[] args) throws Exception {9		VM vm = new VM();10		vm.load("test.asm");11		vm.run();12		String output = vm.waitForOutput();13		System.out.println(output);14	}15}16import java.util.*;17import java.io.*;18import java.net.*;19import java.nio.*;20import java.nio.file.*;21import java.nio.charset.*;22public class VM {23	private int[] memory = new int[1000];24	private int[] registers = new int[8];25	private int ip = 0;26	private int sp = 999;27	private OutputStream output;28	public void load(String filename) throws Exception {29		byte[] bytes = Files.readAllBytes(Paths.get(filename));30		String text = new String(bytes, "UTF-8");31		String[] lines = text.split("\r32");33		for (int i = 0; i < lines.length; i++) {34			String line = lines[i];35			if (line.length() > 0) {36				if (line.charAt(0) == '#') {37				} else {38					String[] tokens = line.split(" ");39					int address = Integer.parseInt(tokens[0]);

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