fs4 1.0.1

No libc, pure Rust cross-platform file locks. Original fs2, now supports async and replace libc by rustix.
Documentation 
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use fs_err3::File;
use std::os::unix::fs::MetadataExt;
use std::os::unix::io::AsRawFd;

lock_impl!(File);
allocate!(File);
allocate_size!(File);

test_mod! {
  use crate::fs_err3::FileExt;
  use fs_err3 as fs;
}