safe-libc 0.4.0

Safe wrappers around the `libc` crate
Documentation 
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//
// Created:  Fri 17 Apr 2020 07:26:13 PM PDT
// Modified: Tue 23 Dec 2025 12:24:49 PM PST
//
// Copyright (C) 2020 Robert Gill <rtgill82@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies of the Software, its documentation and marketing & publicity
// materials, and acknowledgment shall be given in the documentation, materials
// and software packages that this Software was used.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

use crate::errno::Error;
use crate::errno::Result;
use crate::util::zeroed;

#[cfg(not(target_os = "linux"))]
#[allow(non_camel_case_types)]
type r_int = i32;

#[cfg(target_os = "linux")]
#[allow(non_camel_case_types)]
type r_int = u32;

#[cfg(target_pointer_width = "32")]
#[allow(non_camel_case_types)]
type rlim = u32;

#[cfg(target_pointer_width = "64")]
#[allow(non_camel_case_types)]
type rlim = u64;

pub fn getrlimit(resource: r_int) -> Result<(rlim, rlim)> {
    let mut rlimit: libc::rlimit = zeroed();

    unsafe {
        if libc::getrlimit(resource, &mut rlimit) == 0 {
            Ok((rlimit.rlim_cur, rlimit.rlim_max))
        } else {
            Err(Error::errno())
        }
    }
}

pub fn setrlimit(resource: r_int, soft: rlim, hard: rlim) -> Result<()> {
    let rlimit = libc::rlimit { rlim_cur: soft, rlim_max: hard };

    unsafe {
        if libc::setrlimit(resource, &rlimit) == 0 {
            Ok(())
        } else {
            return Err(Error::errno());
        }
    }
}