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Diffstat (limited to 'vendor/rustix/src/mm/madvise.rs')
| -rw-r--r-- | vendor/rustix/src/mm/madvise.rs | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/vendor/rustix/src/mm/madvise.rs b/vendor/rustix/src/mm/madvise.rs new file mode 100644 index 0000000..4015d12 --- /dev/null +++ b/vendor/rustix/src/mm/madvise.rs @@ -0,0 +1,49 @@ +//! 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] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_madvise.html +/// [Linux `madvise`]: https://man7.org/linux/man-pages/man2/madvise.2.html +/// [Linux `posix_madvise`]: https://man7.org/linux/man-pages/man3/posix_madvise.3.html +/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/madvise.2.html +/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=madvise&sektion=2 +/// [NetBSD]: https://man.netbsd.org/madvise.2 +/// [OpenBSD]: https://man.openbsd.org/madvise.2 +/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=madvise§ion=2 +/// [illumos]: https://illumos.org/man/3C/madvise +/// [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) +} |