golang.org/x/sys v0.0.0-20190422165155-953cdadca894: unix

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@v0.0.0-20190422165155-953cdadca894
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.0.0-20190422165155-953cdadca894
Required runtime conditions:
  - ecosystem: golang
  - language: go
  - packageManager: go@1.26.6
  - runtime: go@1.26.6

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:sha256:6527ed26e7af92cc11df9d345ad3499ff0b081e4e9faf0153b98a5fa78b5fc45","contract":["unix.Getpid returns a positive process ID matching os.Getpid","unix.Getpagesize returns a standard system page size greater than zero","unix.Uname successfully retrieves kernel system information","unix.EINVAL has the numeric value 22 matching Linux POSIX EINVAL errno","unix.EINVAL implements the error interface returning \"invalid argument\"","unix.EINVAL is interchangeable with syscall.EINVAL when converted to syscall.Errno","unix.Nanosleep with invalid negative nanoseconds fails with an error equal to unix.EINVAL","errors.Is accurately identifies unix.EINVAL from failed syscall errors"],"goal":"verify pkg:golang/golang.org/x/sys@v0.0.0-20190422165155-953cdadca894","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.0.0-20190422165155-953cdadca894"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/sys@v0.0.0-20190422165155-953cdadca894"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.0.0-20190422165155-953cdadca894","symbols":["golang.org/x/sys/unix"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.22

require golang.org/x/sys v0.0.0-20190422165155-953cdadca894

golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc=
golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

package main

import (
	"fmt"
	"os"

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

func main() {
	pid := unix.Getpid()
	pageSize := unix.Getpagesize()

	var uts unix.Utsname
	if err := unix.Uname(&uts); err != nil {
		fmt.Fprintf(os.Stderr, "uname failed: %v\n", err)
		os.Exit(1)
	}

	fmt.Printf("PID: %d, PageSize: %d, EINVAL: %d\n", pid, pageSize, int(unix.EINVAL))
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/sys@v0.0.0-20190422165155-953cdadca894",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.0.0-20190422165155-953cdadca894"
  ],
  "runtimeConditions": {
    "ecosystem": "golang",
    "language": "go",
    "packageManager": "go@1.26.6",
    "runtime": "go@1.26.6"
  }
}

package main

import (
	"errors"
	"fmt"
	"os"
	"syscall"

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

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

	// Assertion 2: unix.Getpagesize returns a standard system page size greater than zero
	pageSize := unix.Getpagesize()
	if pageSize <= 0 {
		fmt.Fprintf(os.Stderr, "FAIL: expected positive page size, got %d\n", pageSize)
		os.Exit(1)
	}

	// Assertion 3: unix.Uname successfully retrieves kernel system information
	var uts unix.Utsname
	if err := unix.Uname(&uts); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Uname returned error: %v\n", err)
		os.Exit(1)
	}

	// Assertion 4: unix.EINVAL has the numeric value 22 matching Linux POSIX EINVAL errno
	if int(unix.EINVAL) != 22 {
		fmt.Fprintf(os.Stderr, "FAIL: expected unix.EINVAL == 22, got %d\n", int(unix.EINVAL))
		os.Exit(1)
	}

	// Assertion 5: unix.EINVAL implements the error interface returning "invalid argument"
	if unix.EINVAL.Error() != "invalid argument" {
		fmt.Fprintf(os.Stderr, "FAIL: expected Error() == 'invalid argument', got %q\n", unix.EINVAL.Error())
		os.Exit(1)
	}

	// Assertion 6: unix.EINVAL is interchangeable with syscall.EINVAL when converted to syscall.Errno
	if syscall.Errno(unix.EINVAL) != syscall.EINVAL {
		fmt.Fprintf(os.Stderr, "FAIL: expected syscall.Errno(unix.EINVAL) == syscall.EINVAL\n")
		os.Exit(1)
	}

	// Assertion 7: unix.Nanosleep with invalid negative nanoseconds fails with an error equal to unix.EINVAL
	err := unix.Nanosleep(&unix.Timespec{Sec: 0, Nsec: -1}, nil)
	if err == nil {
		fmt.Fprintf(os.Stderr, "FAIL: expected error from invalid Nanosleep, got nil\n")
		os.Exit(1)
	}
	if err != unix.EINVAL {
		fmt.Fprintf(os.Stderr, "FAIL: expected unix.EINVAL from Nanosleep, got %v\n", err)
		os.Exit(1)
	}

	// Assertion 8: errors.Is accurately identifies unix.EINVAL from failed syscall errors
	if !errors.Is(err, unix.EINVAL) {
		fmt.Fprintf(os.Stderr, "FAIL: expected errors.Is(err, unix.EINVAL) to be true\n")
		os.Exit(1)
	}

	fmt.Println("PASS: golang.org/x/sys/unix contract verified successfully")
}