golang.org/x/sys v0.0.0-20200331124033-c3d80250170d: unix.Uname, unix.ByteSliceFromString, unix.Getpid

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@v0.0.0-20200331124033-c3d80250170d
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.0.0-20200331124033-c3d80250170d

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:sha256:6b0369a1fe9a67d2ad753176f6d510ad750821f4a12d802756cd5e331aafc067","contract":["unix.Uname populates unix.Utsname with non-empty NUL-terminated Sysname, Machine, and Release fields","unix.ByteSliceFromString converts a valid string without NUL bytes into a NUL-terminated byte slice","unix.ByteSliceFromString rejects strings containing embedded NUL bytes with unix.EINVAL","unix.Getpid and unix.Getpagesize return positive integers matching os.Getpid and os.Getpagesize","unix.Nanosleep with negative nanoseconds returns unix.EINVAL"],"goal":"verify pkg:golang/golang.org/x/sys@v0.0.0-20200331124033-c3d80250170d","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.0.0-20200331124033-c3d80250170d"],"schemaVersion":1,"symbols":["unix.Uname","unix.ByteSliceFromString","unix.Getpid","unix.Getpagesize","unix.Nanosleep","unix.EINVAL"]},"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@v0.0.0-20200331124033-c3d80250170d"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.0.0-20200331124033-c3d80250170d","symbols":["unix.Uname","unix.ByteSliceFromString","unix.Getpid","unix.Getpagesize","unix.Nanosleep","unix.EINVAL"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.22

require golang.org/x/sys v0.0.0-20200331124033-c3d80250170d

golang.org/x/sys v0.0.0-20200331124033-c3d80250170d h1:nc5K6ox/4lTFbMVSL9WRR81ixkcwXThoiF6yf+R9scA=
golang.org/x/sys v0.0.0-20200331124033-c3d80250170d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

package main

import (
	"bytes"
	"fmt"

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

func cstr(b []byte) string {
	if i := bytes.IndexByte(b, 0); i >= 0 {
		return string(b[:i])
	}
	return string(b)
}

func main() {
	var uts unix.Utsname
	if err := unix.Uname(&uts); err != nil {
		panic(err)
	}
	fmt.Printf("sysname=%s pid=%d\n", cstr(uts.Sysname[:]), unix.Getpid())
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/sys@v0.0.0-20200331124033-c3d80250170d",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.0.0-20200331124033-c3d80250170d"
  ]
}

package main

import (
	"bytes"
	"errors"
	"fmt"
	"os"

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

func cstr(b []byte) string {
	if i := bytes.IndexByte(b, 0); i >= 0 {
		return string(b[:i])
	}
	return string(b)
}

func main() {
	// 1. unix.Uname populates unix.Utsname with non-empty NUL-terminated Sysname, Machine, and Release fields
	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)
	}
	sysname := cstr(uts.Sysname[:])
	machine := cstr(uts.Machine[:])
	release := cstr(uts.Release[:])
	if sysname == "" || machine == "" || release == "" {
		fmt.Fprintf(os.Stderr, "FAIL: expected non-empty sysname, machine, release; got %q, %q, %q\n", sysname, machine, release)
		os.Exit(1)
	}

	// 2. unix.ByteSliceFromString converts a valid string without NUL bytes into a NUL-terminated byte slice
	slice, err := unix.ByteSliceFromString("example-sys")
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: ByteSliceFromString failed: %v\n", err)
		os.Exit(1)
	}
	wantSlice := []byte{'e', 'x', 'a', 'm', 'p', 'l', 'e', '-', 's', 'y', 's', 0}
	if !bytes.Equal(slice, wantSlice) {
		fmt.Fprintf(os.Stderr, "FAIL: ByteSliceFromString expected %v, got %v\n", wantSlice, slice)
		os.Exit(1)
	}

	// 3. unix.ByteSliceFromString rejects strings containing embedded NUL bytes with unix.EINVAL
	if _, err := unix.ByteSliceFromString("invalid\x00value"); !errors.Is(err, unix.EINVAL) {
		fmt.Fprintf(os.Stderr, "FAIL: expected unix.EINVAL for embedded NUL byte, got %v\n", err)
		os.Exit(1)
	}

	// 4. unix.Getpid and unix.Getpagesize return positive integers matching os.Getpid and os.Getpagesize
	if pid := unix.Getpid(); pid <= 0 || pid != os.Getpid() {
		fmt.Fprintf(os.Stderr, "FAIL: expected unix.Getpid() == os.Getpid() > 0, got %d vs %d\n", pid, os.Getpid())
		os.Exit(1)
	}
	if ps := unix.Getpagesize(); ps <= 0 || ps != os.Getpagesize() {
		fmt.Fprintf(os.Stderr, "FAIL: expected unix.Getpagesize() == os.Getpagesize() > 0, got %d vs %d\n", ps, os.Getpagesize())
		os.Exit(1)
	}

	// 5. unix.Nanosleep with negative nanoseconds returns unix.EINVAL
	if err := unix.Nanosleep(&unix.Timespec{Sec: 0, Nsec: -1}, nil); !errors.Is(err, unix.EINVAL) {
		fmt.Fprintf(os.Stderr, "FAIL: expected unix.EINVAL from Nanosleep with negative Nsec, got %v\n", err)
		os.Exit(1)
	}

	fmt.Println("PASS")
}