How to use CommandContext method of osutil Package

Best Syzkaller code snippet using osutil.CommandContext

exec.go

Source:exec.go

...40	}41	return strings.Trim(out.String(), "\n"), nil42}43// const CommandTimeout = 1044func CommandContext(timeout int, binPath string, args []string) (string, error) {45	// Create a new context and add a timeout to it46	ctx, cancel := context.WithTimeout(context.Background(), time.Second*time.Duration(timeout))47	defer cancel() // The cancel should be deferred so resources are cleaned up48	// Create the command with our context49	cmd := exec.CommandContext(ctx, binPath, args...)50	// This time we can simply use Output() to get the result.51	out, err := cmd.Output()52	// We want to check the context error to see if the timeout was executed.53	// The error returned by cmd.Output() will be OS specific based on what54	// happens when a process is killed.55	if ctx.Err() == context.DeadlineExceeded {56		log.Println("Command timed out")57		return "", ctx.Err()58	}59	if err != nil {60		log.Println("Non-zero exit code:", err)61	}62	return strings.Trim(string(out), "\n"), nil63}64// Install command binary.65func Install(tmpPath, binPath string) error {66	defer os.Remove(tmpPath)67	err := exec.CommandContext(context.Background(), "/usr/bin/install", tmpPath, binPath).Run()68	if err != nil {69		log.Println(err)70		return err71	}72	return nil73}74func SendReloadSignal() error {75	ppid := strconv.Itoa(os.Getppid())76	err := exec.CommandContext(context.Background(), "/bin/kill", "-HUP", ppid).Run()77	return err78}...

init.go

Source:init.go

...12	"github.com/google/syzkaller/vm/vmimpl"13)14func makeDefaultParams() *proxyAppParams {15	return &proxyAppParams{16		CommandRunner:  osutilCommandContext,17		InitRetryDelay: 10 * time.Second,18	}19}20func init() {21	vmimpl.Register(22		"proxyapp",23		func(env *vmimpl.Env) (vmimpl.Pool, error) {24			return ctor(makeDefaultParams(), env)25		},26		false)27}28// Package configuration VARs are mostly needed for tests.29type proxyAppParams struct {30	CommandRunner  func(context.Context, string, ...string) subProcessCmd31	InitRetryDelay time.Duration32}33func osutilCommandContext(ctx context.Context, bin string, args ...string) subProcessCmd {34	return osutil.CommandContext(ctx, bin, args...)35}36type subProcessCmd interface {37	StdinPipe() (io.WriteCloser, error)38	StdoutPipe() (io.ReadCloser, error)39	StderrPipe() (io.ReadCloser, error)40	Start() error41	Wait() error42}43type Config struct {44	Command        string          `json:"cmd"`45	ProxyAppConfig json.RawMessage `json:"config"`46}47func parseConfig(conf []byte) (*Config, error) {48	vmCfg := new(Config)...

CommandContext

Using AI Code Generation

1import (2func main() {3	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)4	defer cancel()5	cmd := exec.CommandContext(ctx, "sleep", "1")6	err := cmd.Run()7	fmt.Println(err)8}

CommandContext

Using AI Code Generation

1import (2func main() {3	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)4	defer cancel()5	cmd := exec.CommandContext(ctx, "sleep", "2")6	if err := cmd.Run(); err != nil {7		fmt.Println(err)8	}9}

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