# memfd

[![Build Status](https://travis-ci.org/lucab/memfd-rs.svg?branch=master)](https://travis-ci.org/lucab/memfd-rs)
[![crates.io](https://img.shields.io/crates/v/memfd.svg)](https://crates.io/crates/memfd)
[![Documentation](https://docs.rs/memfd/badge.svg)](https://docs.rs/memfd)

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.

## Example

```rust
extern crate memfd;
use memfd::errors::Result;

fn new_sized_memfd() -> Result<memfd::Memfd> {
    // 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.
    let mut seals = memfd::SealsHashSet::new();
    seals.insert(memfd::FileSeal::SealShrink);
    seals.insert(memfd::FileSeal::SealGrow);
    mfd.add_seals(&seals)?;

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

    Ok(mfd)
}
```

Some more examples are available under [examples](examples).

## License

Licensed under either of

 * MIT license - <http://opensource.org/licenses/MIT>
 * Apache License, Version 2.0 - <http://www.apache.org/licenses/LICENSE-2.0>

at your option.