golang.org/x/sys v0.2.0

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@v0.2.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.2.0

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:sha256:7705d71cb837771c2aeea419f0d2cee7d4f02f303c0ab4b1bbae06bd1cfb1dc0","contract":["unix.Getpid returns a positive process ID","unix.Getppid returns a non-negative parent process ID","unix.Getpagesize returns a positive power-of-two page size","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.Errno when converted","unix.ByteSliceToString converts null-terminated byte slices to string","unix.Nanosleep with invalid negative nanoseconds fails with unix.EINVAL"],"goal":"verify pkg:golang/golang.org/x/sys@v0.2.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.2.0"],"schemaVersion":1},"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","verifierAdapter":"golang@1"}

module example.com/sample

go 1.22

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"

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

func main() {
	pid := unix.Getpid()
	pageSize := unix.Getpagesize()
	fmt.Printf("Process PID: %d, Page size: %d\n", pid, pageSize)
	fmt.Printf("POSIX EINVAL: %d (%s)\n", int(unix.EINVAL), unix.EINVAL.Error())

	var uts unix.Utsname
	if err := unix.Uname(&uts); err == nil {
		fmt.Printf("System: %s\n", unix.ByteSliceToString(uts.Sysname[:]))
	}
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/sys@v0.2.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.2.0"
  ]
}

package main

import (
	"fmt"
	"os"
	"syscall"

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

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

	// Assertion 2: unix.Getppid returns a non-negative parent process ID
	ppid := unix.Getppid()
	if ppid < 0 {
		fmt.Fprintf(os.Stderr, "FAIL: expected non-negative PPID, got %d\n", ppid)
		os.Exit(1)
	}

	// Assertion 3: unix.Getpagesize returns a positive power-of-two page size
	pageSize := unix.Getpagesize()
	if pageSize <= 0 || (pageSize&(pageSize-1)) != 0 {
		fmt.Fprintf(os.Stderr, "FAIL: expected positive power-of-two page size, got %d\n", pageSize)
		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.ByteSliceToString converts null-terminated byte slices to string
	raw := []byte{'l', 'i', 'n', 'u', 'x', 0, 'x'}
	if s := unix.ByteSliceToString(raw); s != "linux" {
		fmt.Fprintf(os.Stderr, "FAIL: expected ByteSliceToString to return \"linux\", got %q\n", s)
		os.Exit(1)
	}

	// Assertion 8: unix.Nanosleep with invalid negative nanoseconds fails with unix.EINVAL
	err := unix.Nanosleep(&unix.Timespec{Sec: 0, Nsec: -1}, nil)
	if err != unix.EINVAL {
		fmt.Fprintf(os.Stderr, "FAIL: expected unix.EINVAL from Nanosleep, got %v\n", err)
		os.Exit(1)
	}

	fmt.Println("PASS: all contract assertions passed")
}