golang.org/x/sys v0.2.0: unix.NsecToTimespec

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.NsecToTimespec in pkg:golang/golang.org/x/sys@v0.2.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.2.0
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.NsecToTimespec

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:sha256:53c389adf39586bb53fcddf46c66debb7e2f9da23a0fabbfe0c707e85e77e786","contract":["unix.NsecToTimespec converts nanoseconds into a unix.Timespec struct with Sec and Nsec fields","unix.NsecToTimespec handles zero nanoseconds resulting in zero Sec and Nsec","unix.NsecToTimespec accurately splits subsecond and multi-second time intervals"],"goal":"verify golang.org/x/sys/unix.NsecToTimespec in pkg:golang/golang.org/x/sys@v0.2.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.2.0"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.NsecToTimespec"]},"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@v0.2.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.2.0","symbols":["golang.org/x/sys/unix.NsecToTimespec"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.24.0

require golang.org/x/sys v0.2.0

golang.org/x/sys v0.2.0 h1:ljd4t30dBnAvMZaQCevtY0xLLD0A+bRZXbgLMLU1F/A=
golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

package main

import (
	"fmt"

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

func NanosecondsToTimespec(nsec int64) unix.Timespec {
	return unix.NsecToTimespec(nsec)
}

func main() {
	nanoseconds := int64(2500000000)
	ts := NanosecondsToTimespec(nanoseconds)
	fmt.Printf("Nanoseconds: %d -> Timespec: {Sec: %d, Nsec: %d}\n", nanoseconds, ts.Sec, ts.Nsec)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.NsecToTimespec in pkg:golang/golang.org/x/sys@v0.2.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.2.0"
  ],
  "symbols": [
    "golang.org/x/sys/unix.NsecToTimespec"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	// Assertion 1: unix.NsecToTimespec converts nanoseconds into a unix.Timespec struct with Sec and Nsec fields
	nsec1 := int64(2500000000)
	ts1 := unix.NsecToTimespec(nsec1)
	if ts1.Sec != 2 || ts1.Nsec != 500000000 {
		fmt.Fprintf(os.Stderr, "FAIL: expected Sec=2, Nsec=500000000, got Sec=%d, Nsec=%d\n", ts1.Sec, ts1.Nsec)
		os.Exit(1)
	}

	// Assertion 2: unix.NsecToTimespec handles zero nanoseconds resulting in zero Sec and Nsec
	ts0 := unix.NsecToTimespec(0)
	if ts0.Sec != 0 || ts0.Nsec != 0 {
		fmt.Fprintf(os.Stderr, "FAIL: expected Sec=0, Nsec=0, got Sec=%d, Nsec=%d\n", ts0.Sec, ts0.Nsec)
		os.Exit(1)
	}

	// Assertion 3: unix.NsecToTimespec accurately splits subsecond and multi-second time intervals
	tsSub := unix.NsecToTimespec(123456789)
	if tsSub.Sec != 0 || tsSub.Nsec != 123456789 {
		fmt.Fprintf(os.Stderr, "FAIL: expected Sec=0, Nsec=123456789, got Sec=%d, Nsec=%d\n", tsSub.Sec, tsSub.Nsec)
		os.Exit(1)
	}

	tsMulti := unix.NsecToTimespec(10000000000 + 999999999)
	if tsMulti.Sec != 10 || tsMulti.Nsec != 999999999 {
		fmt.Fprintf(os.Stderr, "FAIL: expected Sec=10, Nsec=999999999, got Sec=%d, Nsec=%d\n", tsMulti.Sec, tsMulti.Nsec)
		os.Exit(1)
	}

	fmt.Println("PASS")
}