golang.org/x/sys v0.5.0: unix.Pipe, unix.NsecToTimeval, 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 pkg:golang/golang.org/x/sys@v0.5.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.5.0

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:d100c35d2340fb6b19f21f711177f22c7a0c32f94b4f528cb6afb05590deab54","contract":["unix.Pipe creates a unidirectional pipe returning valid read and write file descriptors","unix.NsecToTimeval converts nanoseconds to Timeval structure with seconds and microseconds","unix.TimevalToNsec converts Timeval structure back to nanoseconds","unix.Getpid returns the caller process ID matching a positive integer","unix.Uname populates Utsname structure with system information"],"goal":"verify pkg:golang/golang.org/x/sys@v0.5.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.5.0"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.Pipe","golang.org/x/sys/unix.NsecToTimeval","golang.org/x/sys/unix.TimevalToNsec","golang.org/x/sys/unix.Getpid","golang.org/x/sys/unix.Uname"]},"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@v0.5.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.5.0","symbols":["golang.org/x/sys/unix.Pipe","golang.org/x/sys/unix.NsecToTimeval","golang.org/x/sys/unix.TimevalToNsec","golang.org/x/sys/unix.Getpid","golang.org/x/sys/unix.Uname"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.22.0

require golang.org/x/sys v0.5.0

golang.org/x/sys v0.5.0 h1:MUK/U/4lj1t1oPg0HfuXDN/Z1wv31ZJ/YcPiGccS4DU=
golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

package main

import (
	"fmt"
	"os"

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

// CreatePipe creates a unidirectional data channel returning read and write file descriptors.
func CreatePipe() ([2]int, error) {
	var fds [2]int
	if err := unix.Pipe(fds[:]); err != nil {
		return fds, fmt.Errorf("pipe failed: %w", err)
	}
	return fds, nil
}

// ConvertNsecToTimeval converts nanoseconds to a unix Timeval structure.
func ConvertNsecToTimeval(nsec int64) unix.Timeval {
	return unix.NsecToTimeval(nsec)
}

// ConvertTimevalToNsec converts a unix Timeval structure to nanoseconds.
func ConvertTimevalToNsec(tv unix.Timeval) int64 {
	return unix.TimevalToNsec(tv)
}

// GetProcessID returns the caller's process ID.
func GetProcessID() int {
	return unix.Getpid()
}

// GetSystemUtsname returns the system utsname struct.
func GetSystemUtsname() (unix.Utsname, error) {
	var uts unix.Utsname
	if err := unix.Uname(&uts); err != nil {
		return uts, fmt.Errorf("uname failed: %w", err)
	}
	return uts, nil
}

func main() {
	pid := GetProcessID()
	fmt.Printf("Process ID: %d\n", pid)

	uts, err := GetSystemUtsname()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error getting uname: %v\n", err)
		os.Exit(1)
	}
	fmt.Printf("System info retrieved successfully (Machine type: %d bytes)\n", len(uts.Machine))

	fds, err := CreatePipe()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error creating pipe: %v\n", err)
		os.Exit(1)
	}
	defer unix.Close(fds[0])
	defer unix.Close(fds[1])
	fmt.Printf("Pipe created with FDs: [%d, %d]\n", fds[0], fds[1])

	tv := ConvertNsecToTimeval(1_500_000_000)
	fmt.Printf("Timeval: Sec=%d, Usec=%d\n", tv.Sec, tv.Usec)
	nsec := ConvertTimevalToNsec(tv)
	fmt.Printf("Recovered Nsec: %d\n", nsec)
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/sys@v0.5.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.5.0"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	// Assertion 1: unix.Pipe creates a unidirectional pipe returning valid read and write file descriptors
	var fds [2]int
	if err := unix.Pipe(fds[:]); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Pipe failed: %v\n", err)
		os.Exit(1)
	}
	defer unix.Close(fds[0])
	defer unix.Close(fds[1])

	if fds[0] < 0 || fds[1] < 0 {
		fmt.Fprintf(os.Stderr, "FAIL: invalid pipe descriptors: [%d, %d]\n", fds[0], fds[1])
		os.Exit(1)
	}

	payload := []byte("csx-pipe-contract-test")
	wn, err := unix.Write(fds[1], payload)
	if err != nil || wn != len(payload) {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Write on pipe failed: wn=%d, err=%v\n", wn, err)
		os.Exit(1)
	}

	rbuf := make([]byte, len(payload))
	rn, err := unix.Read(fds[0], rbuf)
	if err != nil || rn != len(payload) {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Read on pipe failed: rn=%d, err=%v\n", rn, err)
		os.Exit(1)
	}

	if string(rbuf) != string(payload) {
		fmt.Fprintf(os.Stderr, "FAIL: pipe data mismatch: got %q, want %q\n", string(rbuf), string(payload))
		os.Exit(1)
	}

	// Assertion 2: unix.NsecToTimeval converts nanoseconds to Timeval structure with seconds and microseconds
	const inputNsec = int64(2_750_000_000)
	tv := unix.NsecToTimeval(inputNsec)
	if tv.Sec != 2 || tv.Usec != 750_000 {
		fmt.Fprintf(os.Stderr, "FAIL: unix.NsecToTimeval mismatch: sec=%d, usec=%d (expected sec=2, usec=750000)\n", tv.Sec, tv.Usec)
		os.Exit(1)
	}

	// Assertion 3: unix.TimevalToNsec converts Timeval structure back to nanoseconds
	recoveredNsec := unix.TimevalToNsec(tv)
	if recoveredNsec != inputNsec {
		fmt.Fprintf(os.Stderr, "FAIL: unix.TimevalToNsec mismatch: got %d, want %d\n", recoveredNsec, inputNsec)
		os.Exit(1)
	}

	// Assertion 4: unix.Getpid returns the caller process ID matching a positive integer
	pid := unix.Getpid()
	if pid <= 0 || pid != os.Getpid() {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Getpid mismatch: got %d, want %d\n", pid, os.Getpid())
		os.Exit(1)
	}

	// Assertion 5: unix.Uname populates Utsname structure with system information
	var uts unix.Utsname
	if err := unix.Uname(&uts); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Uname failed: %v\n", err)
		os.Exit(1)
	}
	var nonZeroSysname bool
	for _, b := range uts.Sysname {
		if b != 0 {
			nonZeroSysname = true
			break
		}
	}
	if !nonZeroSysname {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Uname returned all-zero Sysname\n")
		os.Exit(1)
	}

	fmt.Println("PASS: golang.org/x/sys contract passed")
}