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//! The `madvise` function.
//!
//! # Safety
//!
//! `madvise` operates on a raw pointer. Some forms of `madvise` may
//! mutate the memory or have other side effects.
#![allow(unsafe_code)]
use crate::{backend, io};
use core::ffi::c_void;
pub use backend::mm::types::Advice;
/// `posix_madvise(addr, len, advice)`—Declares an expected access pattern
/// for a memory-mapped file.
///
/// # Safety
///
/// `addr` must be a valid pointer to memory that is appropriate to call
/// `posix_madvise` on. Some forms of `advice` may mutate the memory or evoke a
/// variety of side-effects on the mapping and/or the file.
///
/// # References
/// - [POSIX]
/// - [Linux `madvise`]
/// - [Linux `posix_madvise`]
/// - [Apple]
/// - [FreeBSD]
/// - [NetBSD]
/// - [OpenBSD]
/// - [DragonFly BSD]
/// - [illumos]
/// - [glibc]
///
/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/madvise.2.html
/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Memory_002dmapped-I_002fO.html#index-madvise
#[inline]
#[doc(alias = "posix_madvise")]
pub unsafe fn madvise(addr: *mut c_void, len: usize, advice: Advice) -> io::Result<()> {
backend::mm::syscalls::madvise(addr, len, advice)
}