Short version for non-lawyers:

`socketpair` is triple-licensed under Apache 2.0 with the LLVM Exception,
Apache 2.0, and MIT terms.


Longer version:

Copyrights in the `socketpair` project are retained by their contributors.
No copyright assignment is required to contribute to the `socketpair`
project.

Some files include code derived from Rust's `libstd`; see the comments in
the code for details.

Except as otherwise noted (below and/or in individual files), `socketpair`
is licensed under:

 - the Apache License, Version 2.0, with the LLVM Exception
   <LICENSE-Apache-2.0_WITH_LLVM-exception> or
   <http://llvm.org/foundation/relicensing/LICENSE.txt>
 - the Apache License, Version 2.0
   <LICENSE-APACHE> or
   <http://www.apache.org/licenses/LICENSE-2.0>,
 - or the MIT license
   <LICENSE-MIT> or
   <http://opensource.org/licenses/MIT>,

at your option.