golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c

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@v0.0.0-20210124154548-22da62e12c0c
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.0.0-20210124154548-22da62e12c0c

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:sha256:2908926083870002e368f84d34428e17950ca6a237b7e66ca7ade69a88ce77a6","contract":["unix.Getpid returns positive current process ID matching os.Getpid","unix.Getpagesize returns valid positive memory page size","unix.Uname populates unix.Utsname structure with non-empty system metadata","unix.ByteSliceToString decodes unix.Utsname sysname into a non-empty string"],"goal":"verify pkg:golang/golang.org/x/sys@v0.0.0-20210124154548-22da62e12c0c","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.0.0-20210124154548-22da62e12c0c"],"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@v0.0.0-20210124154548-22da62e12c0c"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.0.0-20210124154548-22da62e12c0c","verifierAdapter":"golang@1"}

module example.com/sample

go 1.22.0

require golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c

golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c h1:VwygUrnw9jn88c4u8GD3rZQbqrP/tgas88tPUbBxQrk=
golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

package main

import (
	"fmt"
	"os"

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

// SystemInfo holds system metadata retrieved via unix syscalls.
type SystemInfo struct {
	PID      int
	PageSize int
	Sysname  string
	Machine  string
	Release  string
}

// GetSystemInfo retrieves basic Linux system information using golang.org/x/sys/unix.
func GetSystemInfo() (SystemInfo, error) {
	var uts unix.Utsname
	if err := unix.Uname(&uts); err != nil {
		return SystemInfo{}, fmt.Errorf("uname failed: %w", err)
	}

	return SystemInfo{
		PID:      unix.Getpid(),
		PageSize: unix.Getpagesize(),
		Sysname:  unix.ByteSliceToString(uts.Sysname[:]),
		Machine:  unix.ByteSliceToString(uts.Machine[:]),
		Release:  unix.ByteSliceToString(uts.Release[:]),
	}, nil
}

func main() {
	info, err := GetSystemInfo()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
		os.Exit(1)
	}

	fmt.Printf("PID: %d\n", info.PID)
	fmt.Printf("Page Size: %d\n", info.PageSize)
	fmt.Printf("Sysname: %s\n", info.Sysname)
	fmt.Printf("Machine: %s\n", info.Machine)
	fmt.Printf("Release: %s\n", info.Release)
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/sys@v0.0.0-20210124154548-22da62e12c0c",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.0.0-20210124154548-22da62e12c0c"
  ]
}

package main

import (
	"fmt"
	"os"
	"strings"

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

func main() {
	// Assertion 1: unix.Getpid returns positive current process ID matching os.Getpid
	pid := unix.Getpid()
	if pid <= 0 || pid != os.Getpid() {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Getpid returned %d, expected %d\n", pid, os.Getpid())
		os.Exit(1)
	}

	// Assertion 2: unix.Getpagesize returns valid positive memory page size
	pageSize := unix.Getpagesize()
	if pageSize <= 0 || (pageSize&(pageSize-1)) != 0 {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Getpagesize returned invalid page size %d\n", pageSize)
		os.Exit(1)
	}

	// Assertion 3: unix.Uname populates unix.Utsname structure with non-empty system metadata
	var uts unix.Utsname
	if err := unix.Uname(&uts); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Uname failed: %v\n", err)
		os.Exit(1)
	}

	// Assertion 4: unix.ByteSliceToString decodes unix.Utsname sysname into a non-empty string
	sysname := unix.ByteSliceToString(uts.Sysname[:])
	if strings.TrimSpace(sysname) == "" {
		fmt.Fprintf(os.Stderr, "FAIL: Sysname string is empty\n")
		os.Exit(1)
	}

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