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

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.Nanosleep 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.Nanosleep

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:sha256:7076d4b72520968c875159805d8d6f65fb87885acc65297d1de7f190ca08b6f8","contract":["unix.Nanosleep suspends execution for a valid Timespec duration and returns nil","unix.Nanosleep accepts a non-nil leftover Timespec pointer and returns nil on successful sleep","unix.Nanosleep returns EINVAL when given negative nanoseconds or nanoseconds exceeding one second"],"goal":"verify golang.org/x/sys/unix.Nanosleep 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.Nanosleep"]},"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.Nanosleep"],"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"
	"time"

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

// SleepDuration uses unix.Nanosleep to suspend execution for the specified duration.
func SleepDuration(d time.Duration) error {
	ts := unix.NsecToTimespec(d.Nanoseconds())
	return unix.Nanosleep(&ts, nil)
}

func main() {
	dur := 5 * time.Millisecond
	if err := SleepDuration(dur); err != nil {
		fmt.Printf("unix.Nanosleep failed: %v\n", err)
		return
	}
	fmt.Println("unix.Nanosleep completed successfully.")
}

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

package main

import (
	"errors"
	"fmt"
	"os"
	"time"

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

func main() {
	// Assertion 1: unix.Nanosleep suspends execution for a valid Timespec duration and returns nil
	start := time.Now()
	req := unix.Timespec{Sec: 0, Nsec: 5000000} // 5ms
	if err := unix.Nanosleep(&req, nil); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: expected nil error for valid sleep, got %v\n", err)
		os.Exit(1)
	}
	elapsed := time.Since(start)
	if elapsed < 4*time.Millisecond {
		fmt.Fprintf(os.Stderr, "FAIL: sleep returned too quickly: %v\n", elapsed)
		os.Exit(1)
	}

	// Assertion 2: unix.Nanosleep accepts a non-nil leftover Timespec pointer and returns nil on successful sleep
	var rem unix.Timespec
	req2 := unix.Timespec{Sec: 0, Nsec: 1000000} // 1ms
	if err := unix.Nanosleep(&req2, &rem); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: expected nil error with leftover pointer, got %v\n", err)
		os.Exit(1)
	}

	// Assertion 3: unix.Nanosleep returns EINVAL when given negative nanoseconds or nanoseconds exceeding one second
	negReq := unix.Timespec{Sec: 0, Nsec: -1}
	if err := unix.Nanosleep(&negReq, nil); !errors.Is(err, unix.EINVAL) {
		fmt.Fprintf(os.Stderr, "FAIL: expected EINVAL for negative Nsec, got %v\n", err)
		os.Exit(1)
	}

	overflowReq := unix.Timespec{Sec: 0, Nsec: 1000000000}
	if err := unix.Nanosleep(&overflowReq, nil); !errors.Is(err, unix.EINVAL) {
		fmt.Fprintf(os.Stderr, "FAIL: expected EINVAL for Nsec >= 10^9, got %v\n", err)
		os.Exit(1)
	}

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