golang.org/x/sys v0.40.0: unix.Timespec

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.Timespec in pkg:golang/golang.org/x/sys@v0.40.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.40.0
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.Timespec

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:sha256:48d68db8bb71a8e8d8cb0ded6b2d8ce8c69585eb4122584531b143d2fe1883e7","contract":["unix.Timespec represents seconds and nanoseconds via Sec and Nsec fields","unix.Timespec.Nano returns total elapsed nanoseconds","unix.Timespec.Unix returns second and nanosecond components","unix.TimeToTimespec converts time.Time into a unix.Timespec"],"goal":"verify golang.org/x/sys/unix.Timespec in pkg:golang/golang.org/x/sys@v0.40.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.40.0"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.Timespec"]},"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@v0.40.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.40.0","symbols":["golang.org/x/sys/unix.Timespec"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require golang.org/x/sys v0.40.0

golang.org/x/sys v0.40.0 h1:DBZZqJ2Rkml6QMQsZywtnjnnGvHza6BTfYFWY9kjEWQ=
golang.org/x/sys v0.40.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=

package main

import (
	"fmt"
	"time"

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

// CreateTimespec returns a unix.Timespec initialized with the specified seconds and nanoseconds.
func CreateTimespec(sec, nsec int64) unix.Timespec {
	return unix.Timespec{
		Sec:  sec,
		Nsec: nsec,
	}
}

// ConvertTimeToTimespec converts standard time.Time into unix.Timespec.
func ConvertTimeToTimespec(t time.Time) (unix.Timespec, error) {
	return unix.TimeToTimespec(t)
}

func main() {
	ts := CreateTimespec(5, 500000000)
	fmt.Printf("Timespec: Sec=%d, Nsec=%d, TotalNano=%d\n", ts.Sec, ts.Nsec, ts.Nano())

	sec, nsec := ts.Unix()
	fmt.Printf("Unix components: Sec=%d, Nsec=%d\n", sec, nsec)

	now := time.Unix(1700000000, 123456789)
	tsFromTime, err := ConvertTimeToTimespec(now)
	if err != nil {
		fmt.Printf("Conversion error: %v\n", err)
		return
	}
	fmt.Printf("Converted from time.Time: Sec=%d, Nsec=%d\n", tsFromTime.Sec, tsFromTime.Nsec)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.Timespec in pkg:golang/golang.org/x/sys@v0.40.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.40.0"
  ],
  "symbols": [
    "golang.org/x/sys/unix.Timespec"
  ]
}

package main

import (
	"fmt"
	"os"
	"time"

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

func main() {
	// Assertion 1: unix.Timespec represents seconds and nanoseconds via Sec and Nsec fields
	ts := unix.Timespec{
		Sec:  10,
		Nsec: 250000000,
	}
	if ts.Sec != 10 || ts.Nsec != 250000000 {
		fmt.Fprintf(os.Stderr, "FAIL: expected Sec=10, Nsec=250000000, got Sec=%d, Nsec=%d\n", ts.Sec, ts.Nsec)
		os.Exit(1)
	}

	var tsZero unix.Timespec
	if tsZero.Sec != 0 || tsZero.Nsec != 0 {
		fmt.Fprintf(os.Stderr, "FAIL: expected zero Timespec, got %+v\n", tsZero)
		os.Exit(1)
	}

	// Assertion 2: unix.Timespec.Nano returns total elapsed nanoseconds
	expectedNano := int64(10*1e9 + 250000000)
	if nano := ts.Nano(); nano != expectedNano {
		fmt.Fprintf(os.Stderr, "FAIL: expected Nano()=%d, got %d\n", expectedNano, nano)
		os.Exit(1)
	}

	// Assertion 3: unix.Timespec.Unix returns second and nanosecond components
	sec, nsec := ts.Unix()
	if sec != 10 || nsec != 250000000 {
		fmt.Fprintf(os.Stderr, "FAIL: expected Unix()=(10, 250000000), got (%d, %d)\n", sec, nsec)
		os.Exit(1)
	}

	// Assertion 4: unix.TimeToTimespec converts time.Time into a unix.Timespec
	t := time.Unix(1700000000, 750000000)
	tsConv, err := unix.TimeToTimespec(t)
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: TimeToTimespec error: %v\n", err)
		os.Exit(1)
	}
	if tsConv.Sec != 1700000000 || tsConv.Nsec != 750000000 {
		fmt.Fprintf(os.Stderr, "FAIL: expected Sec=1700000000, Nsec=750000000, got Sec=%d, Nsec=%d\n", tsConv.Sec, tsConv.Nsec)
		os.Exit(1)
	}

	fmt.Println("PASS: unix.Timespec contract verified successfully")
}