libpledge 0.1.0

libpledge is a library that provides similar functionality to the OpenBSD pledge(2) functionality for Rust programs on Linux.
Documentation 
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/*
 * Copyright © 2022, Steve Smith <tarkasteve@gmail.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for
 * any purpose with or without fee is hereby granted, provided that the
 * above copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

use nix::{
    sys::{
        signal::Signal,
        wait::{waitpid, WaitStatus},
    },
    unistd::{fork, ForkResult},
};

use std::{time::{SystemTime, UNIX_EPOCH}, path::PathBuf};

pub fn fork_expect_code(expected: i32, childfn: fn()) {
    let r = unsafe { fork() }.unwrap();
    if let ForkResult::Parent { child: pid } = r {
        let ret = waitpid(pid, None).unwrap();
        match ret {
            WaitStatus::Exited(p2, code) => {
                assert!(p2 == pid);
                println!("Expect: {} == {}", code, expected);
                assert!(code == expected);
            }
            _ => assert!(false, "Wrong return: {:?}", ret),
        }
    } else {
        childfn();
    }
}

pub fn fork_expect_sig(expected: Signal, childfn: fn()) {
    let r = unsafe { fork() }.unwrap();
    if let ForkResult::Parent { child: pid } = r {
        let ret = waitpid(pid, None).unwrap();
        match ret {
            WaitStatus::Signaled(p2, sig, _) => {
                assert!(p2 == pid);
                assert!(sig == expected);
            }
            _ => assert!(false, "Wrong return: {:?}", ret),
        }
    } else {
        childfn();
    }
}

pub fn tmpfile() -> PathBuf {
    let ts = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap()
        .as_micros();
    PathBuf::from(format!("target/{}.tmp", ts))
}