golang.org/x/sys v0.41.0: unix.Getrlimit

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.Getrlimit in pkg:golang/golang.org/x/sys@v0.41.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.41.0
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.Getrlimit
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:a4e0c33c43755c625578a31068a966a6dce03b2a6270d311192096010e352276","contract":["unix.Getrlimit(unix.RLIMIT_NOFILE, \u0026rlimit) succeeds without error","unix.Getrlimit(unix.RLIMIT_NOFILE, \u0026rlimit) returns Cur \u003c= Max"],"goal":"verify golang.org/x/sys/unix.Getrlimit in pkg:golang/golang.org/x/sys@v0.41.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.41.0"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.Getrlimit"]},"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@v0.41.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.41.0","symbols":["golang.org/x/sys/unix.Getrlimit"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require golang.org/x/sys v0.41.0

golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=

package main

import (
	"fmt"

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

// GetFileLimit retrieves the soft and hard limits for the number of open files.
func GetFileLimit() (unix.Rlimit, error) {
	var rlim unix.Rlimit
	err := unix.Getrlimit(unix.RLIMIT_NOFILE, &rlim)
	return rlim, err
}

func main() {
	rlim, err := GetFileLimit()
	if err != nil {
		fmt.Printf("Getrlimit error: %v\n", err)
		return
	}
	fmt.Printf("RLIMIT_NOFILE: Cur=%d, Max=%d\n", rlim.Cur, rlim.Max)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.Getrlimit in pkg:golang/golang.org/x/sys@v0.41.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.41.0"
  ],
  "symbols": [
    "golang.org/x/sys/unix.Getrlimit"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

package main

import (
	"fmt"
	"os"

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

func main() {
	var rlim unix.Rlimit
	err := unix.Getrlimit(unix.RLIMIT_NOFILE, &rlim)
	if err != nil {
		fmt.Fprintf(os.Stderr, "contract violation: Getrlimit(RLIMIT_NOFILE) failed: %v\n", err)
		os.Exit(1)
	}

	if rlim.Cur > rlim.Max {
		fmt.Fprintf(os.Stderr, "contract violation: soft limit (%d) exceeds hard limit (%d)\n", rlim.Cur, rlim.Max)
		os.Exit(1)
	}

	fmt.Printf("contract passed: RLIMIT_NOFILE Cur=%d <= Max=%d\n", rlim.Cur, rlim.Max)
}