libc 0.2.190: libc::_SC_PAGESIZE

# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4

[[package]]
name = "libc"
version = "0.2.190"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ce5d3ddc6d3fa000eb1536d85e147bfe31aacaba692ed6a876f95cb7c855be78"

[[package]]
name = "sample-sc-pagesize"
version = "0.1.0"
dependencies = [
 "libc",
]

[package]
name = "sample-sc-pagesize"
version = "0.1.0"
edition = "2021"

[dependencies]
libc = "=0.2.190"

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 libc::_SC_PAGESIZE in pkg:cargo/libc@0.2.190
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/libc@0.2.190
Demonstrate these symbols/APIs:
  - libc::_SC_PAGESIZE

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:a6f48500091682dd694dbfb1fb0f1fd5e464aaf22b49cc9ae451abb7742ff8f5","contract":["libc::_SC_PAGESIZE equals 30 on Linux and matches libc::_SC_PAGE_SIZE","unsafe { libc::sysconf(libc::_SC_PAGESIZE) } returns a positive power-of-two page size in bytes (\u003e= 4096)"],"goal":"verify libc::_SC_PAGESIZE in pkg:cargo/libc@0.2.190","kind":"HOW","packages":["pkg:cargo/libc@0.2.190"],"schemaVersion":1,"symbols":["libc::_SC_PAGESIZE"]},"contractCommand":["cargo","run","--offline"],"environment":{"arch":"x64","ecosystem":"cargo","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/libc@0.2.190"],"schemaVersion":1,"subject":"pkg:cargo/libc@0.2.190","symbols":["libc::_SC_PAGESIZE"],"verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify libc::_SC_PAGESIZE in pkg:cargo/libc@0.2.190",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/libc@0.2.190"
  ],
  "symbols": [
    "libc::_SC_PAGESIZE"
  ]
}

use libc::{_SC_PAGESIZE, _SC_PAGE_SIZE, c_int, c_long, sysconf};

pub fn query_pagesize() -> (c_int, c_long) {
    let selector: c_int = libc::_SC_PAGESIZE;
    let page_size: c_long = unsafe { sysconf(_SC_PAGESIZE) };
    (selector, page_size)
}

fn main() {
    let (selector, page_size) = query_pagesize();
    assert_eq!(selector, 30);
    assert_eq!(libc::_SC_PAGESIZE, _SC_PAGE_SIZE);
    assert!(page_size >= 4096, "sysconf(_SC_PAGESIZE) must return a page size >= 4096 bytes");
    assert_eq!(page_size & (page_size - 1), 0, "page size must be a power of two");
}

use libc::{_SC_PAGESIZE, _SC_PAGE_SIZE, c_int, c_long, sysconf};

#[test]
fn verify_sc_pagesize() {
    let code: c_int = libc::_SC_PAGESIZE;
    assert_eq!(code, 30);
    assert_eq!(_SC_PAGESIZE, _SC_PAGE_SIZE);
    let page_size: c_long = unsafe { sysconf(libc::_SC_PAGESIZE) };
    assert!(page_size >= 4096);
    assert_eq!(page_size & (page_size - 1), 0);
}