golang.org/x/sys v0.10.0

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@v0.10.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.10.0

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:b2c553fc2a4890c642a46dd39ed9cbfe0e4d7cc8afa337d66d578ee9efad3ada","contract":["unix.Getpagesize returns a positive page size that is a power of 2","unix.Sysinfo retrieves system statistics with positive uptime and total RAM","unix.Uname retrieves system name and populates Utsname struct with Linux sysname","unix.Getrlimit retrieves valid file descriptor limits where soft limit does not exceed hard limit"],"goal":"verify pkg:golang/golang.org/x/sys@v0.10.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.10.0"],"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@v0.10.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.10.0","verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require golang.org/x/sys v0.10.0

golang.org/x/sys v0.10.0 h1:SqMFp9UcQJZa+pmYuAKjd9xq1f0j5rLcDIk0mj4qAsA=
golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

package main

import (
	"fmt"
	"os"

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

// GetSystemPageSize returns the memory page size in bytes.
func GetSystemPageSize() int {
	return unix.Getpagesize()
}

// GetSystemInfo retrieves system statistics including total RAM and system uptime.
func GetSystemInfo() (unix.Sysinfo_t, error) {
	var si unix.Sysinfo_t
	if err := unix.Sysinfo(&si); err != nil {
		return si, fmt.Errorf("sysinfo failed: %w", err)
	}
	return si, nil
}

// GetSystemUname retrieves operating system name, node name, and release version.
func GetSystemUname() (unix.Utsname, string, error) {
	var uts unix.Utsname
	if err := unix.Uname(&uts); err != nil {
		return uts, "", fmt.Errorf("uname failed: %w", err)
	}
	sysname := unix.ByteSliceToString(uts.Sysname[:])
	return uts, sysname, nil
}

// GetFileDescriptorLimit retrieves soft and hard limits for number of open file descriptors.
func GetFileDescriptorLimit() (unix.Rlimit, error) {
	var rlim unix.Rlimit
	if err := unix.Getrlimit(unix.RLIMIT_NOFILE, &rlim); err != nil {
		return rlim, fmt.Errorf("getrlimit RLIMIT_NOFILE failed: %w", err)
	}
	return rlim, nil
}

func main() {
	pageSize := GetSystemPageSize()
	fmt.Printf("Memory page size: %d bytes\n", pageSize)

	si, err := GetSystemInfo()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error getting sysinfo: %v\n", err)
		os.Exit(1)
	}
	fmt.Printf("Uptime: %d seconds, Total RAM: %d bytes\n", si.Uptime, si.Totalram)

	_, sysname, err := GetSystemUname()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error getting uname: %v\n", err)
		os.Exit(1)
	}
	fmt.Printf("System name: %s\n", sysname)

	rlim, err := GetFileDescriptorLimit()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error getting rlimit: %v\n", err)
		os.Exit(1)
	}
	fmt.Printf("FD limits: Cur=%d, Max=%d\n", rlim.Cur, rlim.Max)
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/sys@v0.10.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.10.0"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	// Assertion 1: unix.Getpagesize returns a positive page size that is a power of 2
	pageSize := unix.Getpagesize()
	if pageSize <= 0 || (pageSize&(pageSize-1)) != 0 {
		fmt.Fprintf(os.Stderr, "FAIL: invalid page size: %d\n", pageSize)
		os.Exit(1)
	}

	// Assertion 2: unix.Sysinfo retrieves system statistics with positive uptime and total RAM
	var si unix.Sysinfo_t
	if err := unix.Sysinfo(&si); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Sysinfo failed: %v\n", err)
		os.Exit(1)
	}
	if si.Uptime <= 0 || si.Totalram == 0 {
		fmt.Fprintf(os.Stderr, "FAIL: unexpected sysinfo values: uptime=%d, totalram=%d\n", si.Uptime, si.Totalram)
		os.Exit(1)
	}

	// Assertion 3: unix.Uname retrieves system name and populates Utsname struct with Linux sysname
	var uts unix.Utsname
	if err := unix.Uname(&uts); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Uname failed: %v\n", err)
		os.Exit(1)
	}
	sysname := unix.ByteSliceToString(uts.Sysname[:])
	if sysname != "Linux" {
		fmt.Fprintf(os.Stderr, "FAIL: unexpected sysname: got %q, expected \"Linux\"\n", sysname)
		os.Exit(1)
	}

	// Assertion 4: unix.Getrlimit retrieves valid file descriptor limits where soft limit does not exceed hard limit
	var rlim unix.Rlimit
	if err := unix.Getrlimit(unix.RLIMIT_NOFILE, &rlim); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Getrlimit RLIMIT_NOFILE failed: %v\n", err)
		os.Exit(1)
	}
	if rlim.Cur == 0 || (rlim.Max != unix.RLIM_INFINITY && rlim.Cur > rlim.Max) {
		fmt.Fprintf(os.Stderr, "FAIL: invalid rlimit values: cur=%d, max=%d\n", rlim.Cur, rlim.Max)
		os.Exit(1)
	}

	fmt.Println("PASS: golang.org/x/sys contract passed")
}