Crate memfd

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Expand description

A pure-Rust library to work with Linux memfd and seals.

It provides support for creating memfd objects on Linux and handling seals on them. This was first introduced in Linux kernel 3.17. For further details, see memfd_create(2) manpage.

use memfd;

fn new_sized_memfd() -> Result<memfd::Memfd, Box<dyn std::error::Error>> {
    // Create a sealable memfd.
    let opts = memfd::MemfdOptions::default().allow_sealing(true);
    let mfd = opts.create("sized-1K")?;

    // Resize to 1024B.
    mfd.as_file().set_len(1024)?;

    // Add seals to prevent further resizing.
    mfd.add_seals(&[
        memfd::FileSeal::SealShrink,
        memfd::FileSeal::SealGrow
    ])?;

    // Prevent further sealing changes.
    mfd.add_seal(memfd::FileSeal::SealSeal)?;

    Ok(mfd)
}

Structs

An anonymous volatile file, with sealing capabilities.

A Memfd builder, providing advanced options and flags for specifying its behavior.

Enums

Enumeration of errors possible in this library

Seal that can be applied to a Memfd.

Page size for a hugetlb anonymous file.

Type Definitions

An HashSet specialized on FileSeal.