golang.org/x/sys v0.22.0: unix.EINVAL

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.EINVAL in pkg:golang/golang.org/x/sys@v0.22.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.22.0
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.EINVAL

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:sha256:260009606ac13e1fe8743b8f18a240c1b215655c5143a1622f0540a3c05dcd43","contract":["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.EINVAL reports false for both Timeout and Temporary error methods","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 golang.org/x/sys/unix.EINVAL in pkg:golang/golang.org/x/sys@v0.22.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.22.0"],"schemaVersion":1,"symbols":["golang.org/x/sys/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@v0.22.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.22.0","symbols":["golang.org/x/sys/unix.EINVAL"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require golang.org/x/sys v0.22.0

golang.org/x/sys v0.22.0 h1:RI27ohtqKCnwULzJLqkv897zojh5/DwS/ENaMzUOaWI=
golang.org/x/sys v0.22.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

package main

import (
	"fmt"

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

func main() {
	fmt.Printf("POSIX EINVAL Errno: %d (%s)\n", int(unix.EINVAL), unix.EINVAL.Error())

	// Example syscall triggering EINVAL by passing invalid parameters
	err := unix.Nanosleep(&unix.Timespec{Sec: 0, Nsec: -1}, nil)
	if err == unix.EINVAL {
		fmt.Println("Successfully detected unix.EINVAL from invalid syscall parameter")
	}
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.EINVAL in pkg:golang/golang.org/x/sys@v0.22.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.22.0"
  ],
  "symbols": [
    "golang.org/x/sys/unix.EINVAL"
  ]
}

package main

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

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

func main() {
	// Assertion 1: 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 2: 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 3: 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 4: unix.EINVAL reports false for both Timeout and Temporary error methods
	if unix.EINVAL.Timeout() {
		fmt.Fprintf(os.Stderr, "FAIL: expected unix.EINVAL.Timeout() to be false\n")
		os.Exit(1)
	}
	if unix.EINVAL.Temporary() {
		fmt.Fprintf(os.Stderr, "FAIL: expected unix.EINVAL.Temporary() to be false\n")
		os.Exit(1)
	}

	// Assertion 5: 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 6: 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.EINVAL contract verified successfully")
}