golang.org/x/sys v0.0.0-20220406155245-289d7a0edf71: unix.NsecToTimeval

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 golang.org/x/sys/unix.NsecToTimeval in pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.NsecToTimeval
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:sha256:3579a3a0b3d44f078710e6de07fcbbe3809140a054c417e53060e62fe34148ca","contract":["unix.NsecToTimeval converts nanoseconds to Timeval structure with seconds and microseconds","unix.NsecToTimeval handles zero nanoseconds correctly"],"goal":"verify golang.org/x/sys/unix.NsecToTimeval in pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.NsecToTimeval"]},"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@v0.0.0-20220406155245-289d7a0edf71"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71","symbols":["golang.org/x/sys/unix.NsecToTimeval"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.22.0

require golang.org/x/sys v0.0.0-20220406155245-289d7a0edf71

golang.org/x/sys v0.0.0-20220406155245-289d7a0edf71 h1:PRD0hj6tTuUnCFD08vkvjkYFbQg/9lV8KIxe1y4/cvU=
golang.org/x/sys v0.0.0-20220406155245-289d7a0edf71/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

package main

import (
	"fmt"

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

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

func main() {
	tv := ConvertNsecToTimeval(1_500_000_000)
	fmt.Printf("Timeval: Sec=%d, Usec=%d\n", tv.Sec, tv.Usec)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.NsecToTimeval in pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71"
  ],
  "symbols": [
    "golang.org/x/sys/unix.NsecToTimeval"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

package main

import (
	"fmt"
	"os"

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

func main() {
	// Assertion 1: unix.NsecToTimeval converts nanoseconds to Timeval structure with seconds and microseconds
	const inputNsec = int64(2_750_000_000)
	tv := unix.NsecToTimeval(inputNsec)
	if tv.Sec != 2 || tv.Usec != 750_000 {
		fmt.Fprintf(os.Stderr, "FAIL: unix.NsecToTimeval mismatch: sec=%d, usec=%d (expected sec=2, usec=750000)\n", tv.Sec, tv.Usec)
		os.Exit(1)
	}

	// Assertion 2: unix.NsecToTimeval handles zero nanoseconds correctly
	zeroTv := unix.NsecToTimeval(0)
	if zeroTv.Sec != 0 || zeroTv.Usec != 0 {
		fmt.Fprintf(os.Stderr, "FAIL: unix.NsecToTimeval for 0: sec=%d, usec=%d (expected sec=0, usec=0)\n", zeroTv.Sec, zeroTv.Usec)
		os.Exit(1)
	}

	fmt.Println("PASS: unix.NsecToTimeval contract passed")
}