golang.org/x/sys v0.19.0: unix.TimespecToNsec

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.TimespecToNsec in pkg:golang/golang.org/x/sys@v0.19.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.19.0
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.TimespecToNsec

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:f98a514031941d50c271982bfa8ca90ca89351aff70cd4a88ae0182cb21735ef","contract":["unix.TimespecToNsec converts a unix.Timespec struct into equivalent int64 nanoseconds","unix.TimespecToNsec accurately converts zero, subsecond, and multi-second unix.Timespec values","unix.TimespecToNsec accurately converts negative unix.Timespec representations"],"goal":"verify golang.org/x/sys/unix.TimespecToNsec in pkg:golang/golang.org/x/sys@v0.19.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.19.0"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.TimespecToNsec"]},"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@v0.19.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.19.0","symbols":["golang.org/x/sys/unix.TimespecToNsec"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.22.0

require golang.org/x/sys v0.19.0

golang.org/x/sys v0.19.0 h1:q5f1RH2jigJ1MoAWp2KTp3gm5zAGFUTarQZ5U386+4o=
golang.org/x/sys v0.19.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

package main

import (
	"fmt"

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

// TimespecToNanoseconds converts a unix.Timespec structure into nanoseconds.
func TimespecToNanoseconds(ts unix.Timespec) int64 {
	return unix.TimespecToNsec(ts)
}

func main() {
	ts := unix.Timespec{
		Sec:  2,
		Nsec: 500000000,
	}
	nsec := TimespecToNanoseconds(ts)
	fmt.Printf("Timespec: {Sec: %d, Nsec: %d} -> Nanoseconds: %d\n", ts.Sec, ts.Nsec, nsec)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.TimespecToNsec in pkg:golang/golang.org/x/sys@v0.19.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.19.0"
  ],
  "symbols": [
    "golang.org/x/sys/unix.TimespecToNsec"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	// Assertion 1: unix.TimespecToNsec converts a unix.Timespec struct into equivalent int64 nanoseconds
	ts1 := unix.Timespec{
		Sec:  2,
		Nsec: 500000000,
	}
	nsec1 := unix.TimespecToNsec(ts1)
	expected1 := int64(2500000000)
	if nsec1 != expected1 {
		fmt.Fprintf(os.Stderr, "FAIL: expected %d ns, got %d ns\n", expected1, nsec1)
		os.Exit(1)
	}

	// Assertion 2: unix.TimespecToNsec accurately converts zero, subsecond, and multi-second unix.Timespec values
	// Zero
	tsZero := unix.Timespec{Sec: 0, Nsec: 0}
	if nsecZero := unix.TimespecToNsec(tsZero); nsecZero != 0 {
		fmt.Fprintf(os.Stderr, "FAIL: expected 0 ns for zero timespec, got %d ns\n", nsecZero)
		os.Exit(1)
	}

	// Subsecond
	tsSub := unix.Timespec{Sec: 0, Nsec: 123456789}
	expectedSub := int64(123456789)
	if nsecSub := unix.TimespecToNsec(tsSub); nsecSub != expectedSub {
		fmt.Fprintf(os.Stderr, "FAIL: expected %d ns for subsecond timespec, got %d ns\n", expectedSub, nsecSub)
		os.Exit(1)
	}

	// Multi-second
	tsMulti := unix.Timespec{Sec: 10, Nsec: 999999999}
	expectedMulti := int64(10999999999)
	if nsecMulti := unix.TimespecToNsec(tsMulti); nsecMulti != expectedMulti {
		fmt.Fprintf(os.Stderr, "FAIL: expected %d ns for multi-second timespec, got %d ns\n", expectedMulti, nsecMulti)
		os.Exit(1)
	}

	// Assertion 3: unix.TimespecToNsec accurately converts negative unix.Timespec representations
	tsNeg := unix.Timespec{Sec: -2, Nsec: 100000000}
	expectedNeg := int64(-2000000000 + 100000000) // -1900000000
	if nsecNeg := unix.TimespecToNsec(tsNeg); nsecNeg != expectedNeg {
		fmt.Fprintf(os.Stderr, "FAIL: expected %d ns for negative timespec, got %d ns\n", expectedNeg, nsecNeg)
		os.Exit(1)
	}

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