golang.org/x/sys v0.0.0-20220406155245-289d7a0edf71: unix.Pipe

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.Pipe in pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.Pipe
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:b4595d3d9fd53d4e6e49a24ef7889e973ac65baa2922faad2a6facbd9ba0e30a","contract":["unix.Pipe creates a unidirectional pipe returning valid read and write file descriptors","unix.Write and unix.Read transfer data across the pipe without modification"],"goal":"verify golang.org/x/sys/unix.Pipe in pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.Pipe"]},"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@v0.0.0-20220406155245-289d7a0edf71"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71","symbols":["golang.org/x/sys/unix.Pipe"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.22.0

require golang.org/x/sys v0.0.0-20220406155245-289d7a0edf71

golang.org/x/sys v0.0.0-20220406155245-289d7a0edf71 h1:PRD0hj6tTuUnCFD08vkvjkYFbQg/9lV8KIxe1y4/cvU=
golang.org/x/sys v0.0.0-20220406155245-289d7a0edf71/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

package main

import (
	"fmt"
	"os"

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

// CreatePipe creates a unidirectional pipe 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
}

func main() {
	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])

	msg := []byte("hello unix.Pipe")
	if _, err := unix.Write(fds[1], msg); err != nil {
		fmt.Fprintf(os.Stderr, "Error writing to pipe: %v\n", err)
		os.Exit(1)
	}

	buf := make([]byte, len(msg))
	if _, err := unix.Read(fds[0], buf); err != nil {
		fmt.Fprintf(os.Stderr, "Error reading from pipe: %v\n", err)
		os.Exit(1)
	}

	fmt.Printf("Pipe read output: %s\n", string(buf))
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.Pipe in pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.0.0-20220406155245-289d7a0edf71"
  ],
  "symbols": [
    "golang.org/x/sys/unix.Pipe"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

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)
	}

	// Assertion 2: unix.Write and unix.Read transfer data across the pipe without modification
	payload := []byte("csx-unix-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)
	}

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