golang.org/x/sys v0.38.0

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@v0.38.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.38.0

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:e5b5e01dc710e4f6d71405250ae620d14f9fb67a337334ca22c3859854b360c4","contract":["unix.TimevalToNsec accurately converts unix.Timeval to nanoseconds","unix.NsecToTimeval round-trips nanoseconds back to unix.Timeval","unix.ByteSliceToString converts null-terminated byte slice to string"],"goal":"verify pkg:golang/golang.org/x/sys@v0.38.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.38.0"],"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@v0.38.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.38.0","verifierAdapter":"golang@1"}

module example.com/sample

go 1.24.0

require golang.org/x/sys v0.38.0

golang.org/x/sys v0.38.0 h1:3yZWxaJjBmCWXqhN1qh02AkOnCQ1poK6oF+a7xWL6Gc=
golang.org/x/sys v0.38.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=

package main

import (
	"fmt"

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

// ConvertTimevalToNsec converts unix.Timeval to nanoseconds.
func ConvertTimevalToNsec(sec, usec int64) int64 {
	tv := unix.Timeval{
		Sec:  sec,
		Usec: usec,
	}
	return unix.TimevalToNsec(tv)
}

// ConvertNsecToTimeval converts nanoseconds to unix.Timeval.
func ConvertNsecToTimeval(nsec int64) unix.Timeval {
	return unix.NsecToTimeval(nsec)
}

// ParseNullTerminatedString converts a C-style null-terminated byte slice to a Go string.
func ParseNullTerminatedString(b []byte) string {
	return unix.ByteSliceToString(b)
}

func main() {
	tv := ConvertNsecToTimeval(2500000000)
	fmt.Printf("Timeval: Sec=%d, Usec=%d\n", tv.Sec, tv.Usec)
	nsec := ConvertTimevalToNsec(tv.Sec, tv.Usec)
	fmt.Printf("Nanoseconds: %d\n", nsec)

	s := ParseNullTerminatedString([]byte{'s', 'y', 's', 't', 'e', 'm', 0, 'x'})
	fmt.Printf("String: %s\n", s)
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/sys@v0.38.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.38.0"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	// Assertion 1: unix.TimevalToNsec accurately converts unix.Timeval to nanoseconds
	tv := unix.Timeval{
		Sec:  2,
		Usec: 500000,
	}
	expectedNsec := int64(2500000000)
	actualNsec := unix.TimevalToNsec(tv)
	if actualNsec != expectedNsec {
		fmt.Fprintf(os.Stderr, "FAIL: expected %d ns, got %d ns\n", expectedNsec, actualNsec)
		os.Exit(1)
	}

	// Assertion 2: unix.NsecToTimeval round-trips nanoseconds back to unix.Timeval
	tvZero := unix.Timeval{Sec: 0, Usec: 0}
	if nsec := unix.TimevalToNsec(tvZero); nsec != 0 {
		fmt.Fprintf(os.Stderr, "FAIL: expected 0 ns for zero timeval, got %d ns\n", nsec)
		os.Exit(1)
	}

	rtTv := unix.NsecToTimeval(expectedNsec)
	if rtTv.Sec != tv.Sec || rtTv.Usec != tv.Usec {
		fmt.Fprintf(os.Stderr, "FAIL: round-trip mismatch: expected sec=%d usec=%d, got sec=%d usec=%d\n",
			tv.Sec, tv.Usec, rtTv.Sec, rtTv.Usec)
		os.Exit(1)
	}

	// Assertion 3: unix.ByteSliceToString converts null-terminated byte slice to string
	b := []byte{'h', 'e', 'l', 'l', 'o', 0, 'w', 'o', 'r', 'l', 'd'}
	s := unix.ByteSliceToString(b)
	if s != "hello" {
		fmt.Fprintf(os.Stderr, "FAIL: expected 'hello', got '%s'\n", s)
		os.Exit(1)
	}

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