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

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.TimevalToNsec 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.TimevalToNsec

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:sha256:5cf36f059dcd37a2a0daecd7b1d073f9dd5cc3e7163d12b5204c4cfc32185597","contract":["unix.TimevalToNsec converts a unix.Timeval struct into equivalent nanoseconds","unix.TimevalToNsec accurately handles zero and multi-second time intervals"],"goal":"verify golang.org/x/sys/unix.TimevalToNsec 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.TimevalToNsec"]},"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.TimevalToNsec"],"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"

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

// TimevalToNanoseconds converts a unix.Timeval struct (seconds and microseconds) to nanoseconds.
func TimevalToNanoseconds(tv unix.Timeval) int64 {
	return unix.TimevalToNsec(tv)
}

func main() {
	tv := unix.Timeval{
		Sec:  2,
		Usec: 500000,
	}
	nsec := TimevalToNanoseconds(tv)
	fmt.Printf("Timeval (%d sec, %d usec) -> %d nanoseconds\n", tv.Sec, tv.Usec, nsec)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.TimevalToNsec 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.TimevalToNsec"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	// Assertion 1: unix.TimevalToNsec converts a unix.Timeval struct into equivalent 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.TimevalToNsec accurately handles zero and multi-second time intervals
	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)
	}

	tvSubSec := unix.Timeval{Sec: 0, Usec: 123456}
	if nsec := unix.TimevalToNsec(tvSubSec); nsec != int64(123456000) {
		fmt.Fprintf(os.Stderr, "FAIL: expected 123456000 ns for subsecond timeval, got %d ns\n", nsec)
		os.Exit(1)
	}

	tvMulti := unix.Timeval{Sec: 10, Usec: 999999}
	if nsec := unix.TimevalToNsec(tvMulti); nsec != int64(10999999000) {
		fmt.Fprintf(os.Stderr, "FAIL: expected 10999999000 ns for multi-second timeval, got %d ns\n", nsec)
		os.Exit(1)
	}

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