golang.org/x/sys v0.24.0: unix.EBADF

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.EBADF in pkg:golang/golang.org/x/sys@v0.24.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.24.0
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.EBADF

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:f3dcfd532e3f361bfbf2f3f5eeda1f669ef179747a4488643bd721051f1fd83c","contract":["unix.EBADF equals errno 9 with message \"bad file descriptor\" and name \"EBADF\"","errors.Is matches unix.EBADF against syscall.EBADF","unix.EBADF reports false for Temporary() and Timeout()","unix.Close, unix.Read, and unix.Fstat on an invalid descriptor (-1) return unix.EBADF"],"goal":"verify golang.org/x/sys/unix.EBADF in pkg:golang/golang.org/x/sys@v0.24.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.24.0"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.EBADF"]},"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@v0.24.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.24.0","symbols":["golang.org/x/sys/unix.EBADF"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.22

require golang.org/x/sys v0.24.0

golang.org/x/sys v0.24.0 h1:Twjiwq9dn6R1fQcyiK+wQyHWfaz/BJB+YIpzU/Cv3Xg=
golang.org/x/sys v0.24.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.EBADF in pkg:golang/golang.org/x/sys@v0.24.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.24.0"
  ],
  "symbols": [
    "golang.org/x/sys/unix.EBADF"
  ]
}

package main

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

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

func fail(msg string) {
	fmt.Fprintln(os.Stderr, msg)
	os.Exit(1)
}

func main() {
	if unix.EBADF != syscall.Errno(9) {
		fail(fmt.Sprintf("expected errno 9, got %d", int(unix.EBADF)))
	}
	if unix.EBADF.Error() != "bad file descriptor" {
		fail(fmt.Sprintf("unexpected error string: %q", unix.EBADF.Error()))
	}
	if unix.ErrnoName(unix.EBADF) != "EBADF" {
		fail(fmt.Sprintf("unexpected errno name: %q", unix.ErrnoName(unix.EBADF)))
	}
	if !errors.Is(unix.EBADF, syscall.EBADF) {
		fail("expected errors.Is(unix.EBADF, syscall.EBADF) to be true")
	}
	if unix.EBADF.Temporary() || unix.EBADF.Timeout() {
		fail("expected EBADF Temporary() and Timeout() to be false")
	}

	if err := unix.Close(-1); !errors.Is(err, unix.EBADF) {
		fail(fmt.Sprintf("expected unix.Close(-1) to fail with EBADF, got %v", err))
	}

	buf := make([]byte, 4)
	if _, err := unix.Read(-1, buf); !errors.Is(err, unix.EBADF) {
		fail(fmt.Sprintf("expected unix.Read(-1) to fail with EBADF, got %v", err))
	}

	var stat unix.Stat_t
	if err := unix.Fstat(-1, &stat); !errors.Is(err, unix.EBADF) {
		fail(fmt.Sprintf("expected unix.Fstat(-1) to fail with EBADF, got %v", err))
	}
}