golang.org/x/sys v0.12.0

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:golang/golang.org/x/sys@v0.12.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.12.0
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:0841ee1fc4b9c6f445189d5fa011008b877329f13112dc922c82141822b7d774","contract":["unix.Getpid and unix.Getppid return positive process identifiers","unix.ClockGettime retrieves monotonic clock time with valid nanoseconds","unix.Statfs queries filesystem statistics returning positive block size and total blocks","unix.Eventfd creates non-blocking event file descriptor transferring integer counter value"],"goal":"verify pkg:golang/golang.org/x/sys@v0.12.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.12.0"],"schemaVersion":1},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/sys@v0.12.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.12.0","verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require golang.org/x/sys v0.12.0

golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o=
golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

package main

import (
	"encoding/binary"
	"fmt"
	"os"

	"golang.org/x/sys/unix"
)

// GetProcessIDs returns the current process ID and parent process ID.
func GetProcessIDs() (int, int) {
	pid := unix.Getpid()
	ppid := unix.Getppid()
	return pid, ppid
}

// GetMonotonicTime returns current monotonic clock reading as unix.Timespec.
func GetMonotonicTime() (unix.Timespec, error) {
	var ts unix.Timespec
	if err := unix.ClockGettime(unix.CLOCK_MONOTONIC, &ts); err != nil {
		return ts, fmt.Errorf("clock_gettime failed: %w", err)
	}
	return ts, nil
}

// GetFilesystemStats returns filesystem statistics for the specified path.
func GetFilesystemStats(path string) (unix.Statfs_t, error) {
	var stat unix.Statfs_t
	if err := unix.Statfs(path, &stat); err != nil {
		return stat, fmt.Errorf("statfs failed: %w", err)
	}
	return stat, nil
}

// TransferEventCounter creates an eventfd, writes a counter value, and reads it back.
func TransferEventCounter(val uint64) (uint64, error) {
	fd, err := unix.Eventfd(0, unix.EFD_CLOEXEC|unix.EFD_NONBLOCK)
	if err != nil {
		return 0, fmt.Errorf("eventfd failed: %w", err)
	}
	defer unix.Close(fd)

	var buf [8]byte
	binary.NativeEndian.PutUint64(buf[:], val)
	n, err := unix.Write(fd, buf[:])
	if err != nil {
		return 0, fmt.Errorf("write to eventfd failed: %w", err)
	}
	if n != 8 {
		return 0, fmt.Errorf("short write to eventfd: %d bytes", n)
	}

	var readBuf [8]byte
	rn, err := unix.Read(fd, readBuf[:])
	if err != nil {
		return 0, fmt.Errorf("read from eventfd failed: %w", err)
	}
	if rn != 8 {
		return 0, fmt.Errorf("short read from eventfd: %d bytes", rn)
	}

	result := binary.NativeEndian.Uint64(readBuf[:])
	return result, nil
}

func main() {
	pid, ppid := GetProcessIDs()
	fmt.Printf("Process IDs: PID=%d, PPID=%d\n", pid, ppid)

	ts, err := GetMonotonicTime()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error getting monotonic time: %v\n", err)
		os.Exit(1)
	}
	fmt.Printf("Monotonic time: %d.%09d s\n", ts.Sec, ts.Nsec)

	stat, err := GetFilesystemStats(".")
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error getting filesystem stats: %v\n", err)
		os.Exit(1)
	}
	fmt.Printf("Filesystem stats: Bsize=%d, Blocks=%d\n", stat.Bsize, stat.Blocks)

	counter, err := TransferEventCounter(42)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error with eventfd counter: %v\n", err)
		os.Exit(1)
	}
	fmt.Printf("Eventfd transferred value: %d\n", counter)
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/sys@v0.12.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.12.0"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

package main

import (
	"encoding/binary"
	"fmt"
	"os"

	"golang.org/x/sys/unix"
)

func main() {
	// Assertion 1: unix.Getpid and unix.Getppid return positive process identifiers
	pid := unix.Getpid()
	ppid := unix.Getppid()
	if pid <= 0 || ppid < 0 {
		fmt.Fprintf(os.Stderr, "FAIL: invalid PID=%d or PPID=%d\n", pid, ppid)
		os.Exit(1)
	}

	// Assertion 2: unix.ClockGettime retrieves monotonic clock time with valid nanoseconds
	var ts unix.Timespec
	if err := unix.ClockGettime(unix.CLOCK_MONOTONIC, &ts); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: unix.ClockGettime CLOCK_MONOTONIC failed: %v\n", err)
		os.Exit(1)
	}
	if ts.Sec < 0 || ts.Nsec < 0 || ts.Nsec >= 1000000000 {
		fmt.Fprintf(os.Stderr, "FAIL: invalid timespec values: sec=%d, nsec=%d\n", ts.Sec, ts.Nsec)
		os.Exit(1)
	}

	// Assertion 3: unix.Statfs queries filesystem statistics returning positive block size and total blocks
	var stat unix.Statfs_t
	if err := unix.Statfs(".", &stat); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Statfs failed: %v\n", err)
		os.Exit(1)
	}
	if stat.Bsize <= 0 || stat.Blocks == 0 {
		fmt.Fprintf(os.Stderr, "FAIL: invalid statfs values: bsize=%d, blocks=%d\n", stat.Bsize, stat.Blocks)
		os.Exit(1)
	}

	// Assertion 4: unix.Eventfd creates non-blocking event file descriptor transferring integer counter value
	fd, err := unix.Eventfd(0, unix.EFD_CLOEXEC|unix.EFD_NONBLOCK)
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Eventfd failed: %v\n", err)
		os.Exit(1)
	}
	defer unix.Close(fd)

	var writeBuf [8]byte
	binary.NativeEndian.PutUint64(writeBuf[:], 12345)
	n, err := unix.Write(fd, writeBuf[:])
	if err != nil || n != 8 {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Write on eventfd failed: n=%d, err=%v\n", n, err)
		os.Exit(1)
	}

	var readBuf [8]byte
	rn, err := unix.Read(fd, readBuf[:])
	if err != nil || rn != 8 {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Read on eventfd failed: rn=%d, err=%v\n", rn, err)
		os.Exit(1)
	}

	val := binary.NativeEndian.Uint64(readBuf[:])
	if val != 12345 {
		fmt.Fprintf(os.Stderr, "FAIL: unexpected eventfd value: got %d, expected 12345\n", val)
		os.Exit(1)
	}

	fmt.Println("PASS: golang.org/x/sys contract passed")
}