Replace std::os::unix::io for std::os::fd

This is just taking https://github.com/aya-rs/aya/pull/633 to its
logical conclusion. Because `std::os::fd` was only introduced as a
module in Rust v1.66.0 I have also updated the `Cargo.toml` of the
`aya` package to reflect the true MSRV. Note that this commit is *not*
the cause for this MSRV bump, that was done by a previous commit, this
commit is just making it explicit in the `Cargo.toml`

aya/Cargo.toml

@@ -9,6 +9,7 @@ repository = "https://github.com/aya-rs/aya"
 readme = "README.md"
 documentation = "https://docs.rs/aya"
 edition = "2021"
+rust-version = "1.66"
 
 [dependencies]
 async-io = { workspace = true, optional = true }

aya/src/bpf.rs

@@ -3,7 +3,7 @@ use std::{
     collections::{HashMap, HashSet},
     ffi::CString,
     fs, io,
-    os::{raw::c_int, unix::io::RawFd},
+    os::{fd::RawFd, raw::c_int},
     path::{Path, PathBuf},
 };
 

aya/src/maps/perf/perf_buffer.rs

@@ -1,7 +1,7 @@
 use std::{
     ffi::c_void,
     io, mem,
-    os::unix::io::{AsRawFd, RawFd},
+    os::fd::{AsRawFd, RawFd},
     ptr, slice,
     sync::atomic::{self, AtomicPtr, Ordering},
 };

aya/src/maps/perf/perf_event_array.rs

@@ -4,7 +4,7 @@
 use std::{
     borrow::{Borrow, BorrowMut},
     ops::Deref,
-    os::unix::io::{AsRawFd, RawFd},
+    os::fd::{AsRawFd, RawFd},
     sync::Arc,
 };
 
@@ -64,7 +64,7 @@ impl<T: BorrowMut<MapData> + Borrow<MapData>> AsRawFd for PerfEventArrayBuffer<T
 /// A map that can be used to receive events from eBPF programs using the linux [`perf`] API.
 ///
 /// Each element of a [`PerfEventArray`] is a separate [`PerfEventArrayBuffer`] which can be used
-/// to receive events sent by eBPF programs that use `bpf_perf_event_output()`.    
+/// to receive events sent by eBPF programs that use `bpf_perf_event_output()`.
 ///
 /// To receive events you need to:
 /// * call [`PerfEventArray::open`]
@@ -138,7 +138,7 @@ impl<T: BorrowMut<MapData> + Borrow<MapData>> AsRawFd for PerfEventArrayBuffer<T
 ///
 /// In the example above the implementation of `poll_buffers()` and `poll.poll_readable()` is not
 /// given. [`PerfEventArrayBuffer`] implements the [`AsRawFd`] trait, so you can implement polling
-/// using any crate that can poll file descriptors, like [epoll], [mio] etc.  
+/// using any crate that can poll file descriptors, like [epoll], [mio] etc.
 ///
 /// Perf buffers are internally implemented as ring buffers. If your eBPF programs produce large
 /// amounts of data, in order not to lose events you might want to process each

aya/src/maps/sock/mod.rs

@@ -5,7 +5,7 @@ mod sock_map;
 pub use sock_hash::SockHash;
 pub use sock_map::SockMap;
 
-use std::os::unix::io::{AsRawFd, RawFd};
+use std::os::fd::{AsRawFd, RawFd};
 
 /// A socket map file descriptor.
 #[derive(Copy, Clone)]

aya/src/maps/sock/sock_hash.rs

@@ -1,7 +1,7 @@
 use std::{
     borrow::{Borrow, BorrowMut},
     marker::PhantomData,
-    os::unix::io::{AsRawFd, RawFd},
+    os::fd::{AsRawFd, RawFd},
 };
 
 use crate::{
@@ -42,7 +42,7 @@ use crate::{
 /// # let mut bpf = aya::Bpf::load(&[])?;
 /// use std::io::Write;
 /// use std::net::TcpStream;
-/// use std::os::unix::io::AsRawFd;
+/// use std::os::fd::AsRawFd;
 /// use aya::maps::SockHash;
 /// use aya::programs::SkMsg;
 ///

aya/src/programs/links.rs

@@ -354,7 +354,7 @@ pub enum LinkError {
 #[cfg(test)]
 mod tests {
     use assert_matches::assert_matches;
-    use std::{cell::RefCell, fs::File, mem, os::unix::io::AsRawFd, rc::Rc};
+    use std::{cell::RefCell, fs::File, mem, os::fd::AsRawFd, rc::Rc};
     use tempfile::tempdir;
 
     use crate::{programs::ProgramError, sys::override_syscall};

aya/src/programs/perf_attach.rs

@@ -1,6 +1,6 @@
 //! Perf attach links.
 use libc::close;
-use std::os::unix::io::RawFd;
+use std::os::fd::RawFd;
 
 use crate::{
     generated::bpf_attach_type::BPF_PERF_EVENT,

aya/src/programs/sk_msg.rs

@@ -1,6 +1,6 @@
 //! Skmsg programs.
 
-use std::os::unix::io::AsRawFd;
+use std::os::fd::AsRawFd;
 
 use crate::{
     generated::{bpf_attach_type::BPF_SK_MSG_VERDICT, bpf_prog_type::BPF_PROG_TYPE_SK_MSG},
@@ -39,7 +39,7 @@ use crate::{
 /// # let mut bpf = aya::Bpf::load(&[])?;
 /// use std::io::Write;
 /// use std::net::TcpStream;
-/// use std::os::unix::io::AsRawFd;
+/// use std::os::fd::AsRawFd;
 /// use aya::maps::SockHash;
 /// use aya::programs::SkMsg;
 ///

aya/src/programs/sk_skb.rs

@@ -1,6 +1,6 @@
 //! Skskb programs.
 
-use std::{os::unix::io::AsRawFd, path::Path};
+use std::{os::fd::AsRawFd, path::Path};
 
 use crate::{
     generated::{

aya/src/programs/sock_ops.rs

@@ -1,5 +1,5 @@
 //! Socket option programs.
-use std::os::unix::io::AsRawFd;
+use std::os::fd::AsRawFd;
 
 use crate::{
     generated::{bpf_attach_type::BPF_CGROUP_SOCK_OPS, bpf_prog_type::BPF_PROG_TYPE_SOCK_OPS},

aya/src/programs/socket_filter.rs

@@ -48,7 +48,7 @@ pub enum SocketFilterError {
 /// # }
 /// # let mut bpf = aya::Bpf::load(&[])?;
 /// use std::net::TcpStream;
-/// use std::os::unix::io::AsRawFd;
+/// use std::os::fd::AsRawFd;
 /// use aya::programs::SocketFilter;
 ///
 /// let mut client = TcpStream::connect("127.0.0.1:1234")?;

aya/src/programs/utils.rs

@@ -1,5 +1,5 @@
 //! Common functions shared between multiple eBPF program types.
-use std::{ffi::CStr, io, os::unix::io::RawFd, path::Path};
+use std::{ffi::CStr, io, os::fd::RawFd, path::Path};
 
 use crate::{
     programs::{FdLink, Link, ProgramData, ProgramError},

aya/src/programs/xdp.rs

@@ -3,7 +3,7 @@
 use crate::util::KernelVersion;
 use bitflags;
 use libc::if_nametoindex;
-use std::{convert::TryFrom, ffi::CString, hash::Hash, io, mem, os::unix::io::RawFd};
+use std::{convert::TryFrom, ffi::CString, hash::Hash, io, mem, os::fd::RawFd};
 use thiserror::Error;
 
 use crate::{

aya/src/sys/netlink.rs

@@ -1,4 +1,4 @@
-use std::{collections::HashMap, ffi::CStr, io, mem, os::unix::io::RawFd, ptr, slice};
+use std::{collections::HashMap, ffi::CStr, io, mem, os::fd::RawFd, ptr, slice};
 use thiserror::Error;
 
 use libc::{