libc 0.2.190: sysconf

# 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"
version = "0.1.0"
dependencies = [
 "libc",
]

[package]
name = "sample"
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 sysconf 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:
  - sysconf

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:sha256:47c12251b8bfcbdc9f4e534edd06b35825d1fdcf8d4151ae5673103ee7416aa0","contract":["unsafe { libc::sysconf(libc::_SC_PAGESIZE) } returns a positive libc::c_long equal to unsafe { libc::sysconf(libc::_SC_PAGE_SIZE) }","unsafe { libc::sysconf(libc::_SC_CLK_TCK) } returns a positive libc::c_long for clock ticks per second","unsafe { libc::sysconf(-1) } returns -1 for an invalid configuration name"],"goal":"verify sysconf in pkg:cargo/libc@0.2.190","kind":"HOW","packages":["pkg:cargo/libc@0.2.190"],"schemaVersion":1,"symbols":["sysconf"]},"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":["sysconf"],"verifierAdapter":"cargo@1"}

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

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

fn query_sysconf(name: c_int) -> c_long {
    unsafe { sysconf(name) }
}

fn main() {
    let page_size: c_long = query_sysconf(_SC_PAGESIZE);
    assert!(page_size > 0, "sysconf(_SC_PAGESIZE) must return a positive c_long");
    assert_eq!(
        page_size,
        query_sysconf(_SC_PAGE_SIZE),
        "sysconf(_SC_PAGESIZE) and sysconf(_SC_PAGE_SIZE) must return the same value"
    );

    let clk_tck: c_long = query_sysconf(_SC_CLK_TCK);
    assert!(clk_tck > 0, "sysconf(_SC_CLK_TCK) must return a positive c_long");

    let invalid: c_long = query_sysconf(-1);
    assert_eq!(invalid, -1, "sysconf(-1) must return -1 for an invalid configuration name");
}