Add wasm32-wasip2 target support

Author: nickrum

Cargo.toml

@@ -34,7 +34,7 @@ targets = ["aarch64-apple-ios", "aarch64-linux-android", "x86_64-apple-darwin",
 [package.metadata.playground]
 features = ["all"]
 
-[target."cfg(unix)".dependencies]
+[target.'cfg(any(unix, target_os = "wasi"))'.dependencies]
 libc = "0.2.162"
 
 [target.'cfg(windows)'.dependencies.windows-sys]

src/lib.rs

@@ -58,15 +58,18 @@
 // Disallow warnings in examples.
 #![doc(test(attr(deny(warnings))))]
 
+#[cfg(not(target_os = "wasi"))]
 use std::fmt;
-#[cfg(not(target_os = "redox"))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 use std::io::IoSlice;
-#[cfg(not(target_os = "redox"))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 use std::marker::PhantomData;
-#[cfg(not(target_os = "redox"))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 use std::mem;
+#[cfg(not(target_os = "wasi"))]
 use std::mem::MaybeUninit;
 use std::net::SocketAddr;
+#[cfg(not(target_os = "wasi"))]
 use std::ops::{Deref, DerefMut};
 use std::time::Duration;
 
@@ -107,7 +110,7 @@ macro_rules! from {
     ($from: ty, $for: ty) => {
         impl From<$from> for $for {
             fn from(socket: $from) -> $for {
-                #[cfg(unix)]
+                #[cfg(any(unix, target_os = "wasi"))]
                 unsafe {
                     <$for>::from_raw_fd(socket.into_raw_fd())
                 }
@@ -176,9 +179,10 @@ mod sockref;
 
 #[cfg_attr(unix, path = "sys/unix.rs")]
 #[cfg_attr(windows, path = "sys/windows.rs")]
+#[cfg_attr(target_os = "wasi", path = "sys/wasi.rs")]
 mod sys;
 
-#[cfg(not(any(windows, unix)))]
+#[cfg(not(any(windows, unix, all(target_os = "wasi", target_env = "p2"))))]
 compile_error!("Socket2 doesn't support the compile target");
 
 use sys::c_int;
@@ -216,6 +220,7 @@ impl Domain {
     pub const IPV6: Domain = Domain(sys::AF_INET6);
 
     /// Domain for Unix socket communication, corresponding to `AF_UNIX`.
+    #[cfg(not(target_os = "wasi"))]
     pub const UNIX: Domain = Domain(sys::AF_UNIX);
 
     /// Returns the correct domain for `address`.
@@ -270,15 +275,24 @@ impl Type {
     pub const DCCP: Type = Type(sys::SOCK_DCCP);
 
     /// Type corresponding to `SOCK_SEQPACKET`.
-    #[cfg(all(feature = "all", not(target_os = "espidf")))]
-    #[cfg_attr(docsrs, doc(cfg(all(feature = "all", not(target_os = "espidf")))))]
+    #[cfg(all(feature = "all", not(any(target_os = "espidf", target_os = "wasi"))))]
+    #[cfg_attr(
+        docsrs,
+        doc(cfg(all(feature = "all", not(any(target_os = "espidf", target_os = "wasi")))))
+    )]
     pub const SEQPACKET: Type = Type(sys::SOCK_SEQPACKET);
 
     /// Type corresponding to `SOCK_RAW`.
-    #[cfg(all(feature = "all", not(any(target_os = "redox", target_os = "espidf"))))]
+    #[cfg(all(
+        feature = "all",
+        not(any(target_os = "redox", target_os = "espidf", target_os = "wasi"))
+    ))]
     #[cfg_attr(
         docsrs,
-        doc(cfg(all(feature = "all", not(any(target_os = "redox", target_os = "espidf")))))
+        doc(cfg(all(
+            feature = "all",
+            not(any(target_os = "redox", target_os = "espidf", target_os = "wasi"))
+        )))
     )]
     pub const RAW: Type = Type(sys::SOCK_RAW);
 }
@@ -306,18 +320,20 @@ impl From<Type> for c_int {
 pub struct Protocol(c_int);
 
 impl Protocol {
-    /// Protocol corresponding to `ICMPv4`.
-    pub const ICMPV4: Protocol = Protocol(sys::IPPROTO_ICMP);
-
-    /// Protocol corresponding to `ICMPv6`.
-    pub const ICMPV6: Protocol = Protocol(sys::IPPROTO_ICMPV6);
-
     /// Protocol corresponding to `TCP`.
     pub const TCP: Protocol = Protocol(sys::IPPROTO_TCP);
 
     /// Protocol corresponding to `UDP`.
     pub const UDP: Protocol = Protocol(sys::IPPROTO_UDP);
 
+    #[cfg(not(target_os = "wasi"))]
+    /// Protocol corresponding to `ICMPv4`.
+    pub const ICMPV4: Protocol = Protocol(sys::IPPROTO_ICMP);
+
+    #[cfg(not(target_os = "wasi"))]
+    /// Protocol corresponding to `ICMPv6`.
+    pub const ICMPV6: Protocol = Protocol(sys::IPPROTO_ICMPV6);
+
     #[cfg(target_os = "linux")]
     /// Protocol corresponding to `MPTCP`.
     pub const MPTCP: Protocol = Protocol(sys::IPPROTO_MPTCP);
@@ -363,12 +379,12 @@ impl From<Protocol> for c_int {
 /// Flags for incoming messages.
 ///
 /// Flags provide additional information about incoming messages.
-#[cfg(not(target_os = "redox"))]
-#[cfg_attr(docsrs, doc(cfg(not(target_os = "redox"))))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+#[cfg_attr(docsrs, doc(cfg(not(any(target_os = "redox", target_os = "wasi")))))]
 #[derive(Copy, Clone, Eq, PartialEq)]
 pub struct RecvFlags(c_int);
 
-#[cfg(not(target_os = "redox"))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 impl RecvFlags {
     /// Check if the message contains a truncated datagram.
     ///
@@ -386,15 +402,18 @@ impl RecvFlags {
 /// A version of [`IoSliceMut`] that allows the buffer to be uninitialised.
 ///
 /// [`IoSliceMut`]: std::io::IoSliceMut
+#[cfg(not(target_os = "wasi"))]
 #[repr(transparent)]
 pub struct MaybeUninitSlice<'a>(sys::MaybeUninitSlice<'a>);
 
+#[cfg(not(target_os = "wasi"))]
 impl<'a> fmt::Debug for MaybeUninitSlice<'a> {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         fmt::Debug::fmt(self.0.as_slice(), fmt)
     }
 }
 
+#[cfg(not(target_os = "wasi"))]
 impl<'a> MaybeUninitSlice<'a> {
     /// Creates a new `MaybeUninitSlice` wrapping a byte slice.
     ///
@@ -406,6 +425,7 @@ impl<'a> MaybeUninitSlice<'a> {
     }
 }
 
+#[cfg(not(target_os = "wasi"))]
 impl<'a> Deref for MaybeUninitSlice<'a> {
     type Target = [MaybeUninit<u8>];
 
@@ -414,6 +434,7 @@ impl<'a> Deref for MaybeUninitSlice<'a> {
     }
 }
 
+#[cfg(not(target_os = "wasi"))]
 impl<'a> DerefMut for MaybeUninitSlice<'a> {
     fn deref_mut(&mut self) -> &mut [MaybeUninit<u8>] {
         self.0.as_mut_slice()
@@ -520,6 +541,7 @@ impl TcpKeepalive {
         target_os = "macos",
         target_os = "netbsd",
         target_os = "tvos",
+        target_os = "wasi",
         target_os = "watchos",
         target_os = "windows",
     ))]
@@ -537,6 +559,7 @@ impl TcpKeepalive {
             target_os = "macos",
             target_os = "netbsd",
             target_os = "tvos",
+            target_os = "wasi",
             target_os = "watchos",
             target_os = "windows",
         )))
@@ -566,6 +589,7 @@ impl TcpKeepalive {
             target_os = "macos",
             target_os = "netbsd",
             target_os = "tvos",
+            target_os = "wasi",
             target_os = "watchos",
         )
     ))]
@@ -585,6 +609,7 @@ impl TcpKeepalive {
                 target_os = "macos",
                 target_os = "netbsd",
                 target_os = "tvos",
+                target_os = "wasi",
                 target_os = "watchos",
             )
         )))
@@ -601,14 +626,14 @@ impl TcpKeepalive {
 ///
 /// This wraps `msghdr` on Unix and `WSAMSG` on Windows. Also see [`MsgHdrMut`]
 /// for the variant used by `recvmsg(2)`.
-#[cfg(not(target_os = "redox"))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 pub struct MsgHdr<'addr, 'bufs, 'control> {
     inner: sys::msghdr,
     #[allow(clippy::type_complexity)]
     _lifetimes: PhantomData<(&'addr SockAddr, &'bufs IoSlice<'bufs>, &'control [u8])>,
 }
 
-#[cfg(not(target_os = "redox"))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 impl<'addr, 'bufs, 'control> MsgHdr<'addr, 'bufs, 'control> {
     /// Create a new `MsgHdr` with all empty/zero fields.
     #[allow(clippy::new_without_default)]
@@ -658,7 +683,7 @@ impl<'addr, 'bufs, 'control> MsgHdr<'addr, 'bufs, 'control> {
     }
 }
 
-#[cfg(not(target_os = "redox"))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 impl<'name, 'bufs, 'control> fmt::Debug for MsgHdr<'name, 'bufs, 'control> {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         "MsgHdr".fmt(fmt)
@@ -669,7 +694,7 @@ impl<'name, 'bufs, 'control> fmt::Debug for MsgHdr<'name, 'bufs, 'control> {
 ///
 /// This wraps `msghdr` on Unix and `WSAMSG` on Windows. Also see [`MsgHdr`] for
 /// the variant used by `sendmsg(2)`.
-#[cfg(not(target_os = "redox"))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 pub struct MsgHdrMut<'addr, 'bufs, 'control> {
     inner: sys::msghdr,
     #[allow(clippy::type_complexity)]
@@ -680,7 +705,7 @@ pub struct MsgHdrMut<'addr, 'bufs, 'control> {
     )>,
 }
 
-#[cfg(not(target_os = "redox"))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 impl<'addr, 'bufs, 'control> MsgHdrMut<'addr, 'bufs, 'control> {
     /// Create a new `MsgHdrMut` with all empty/zero fields.
     #[allow(clippy::new_without_default)]
@@ -735,7 +760,7 @@ impl<'addr, 'bufs, 'control> MsgHdrMut<'addr, 'bufs, 'control> {
     }
 }
 
-#[cfg(not(target_os = "redox"))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 impl<'name, 'bufs, 'control> fmt::Debug for MsgHdrMut<'name, 'bufs, 'control> {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         "MsgHdrMut".fmt(fmt)

src/sockaddr.rs

@@ -1,15 +1,18 @@
 use std::hash::Hash;
 use std::mem::{self, size_of, MaybeUninit};
 use std::net::{SocketAddr, SocketAddrV4, SocketAddrV6};
+#[cfg(not(target_os = "wasi"))]
 use std::path::Path;
 use std::{fmt, io, ptr};
 
 #[cfg(windows)]
 use windows_sys::Win32::Networking::WinSock::SOCKADDR_IN6_0;
 
+#[cfg(not(target_os = "wasi"))]
+use crate::sys::AF_UNIX;
 use crate::sys::{
     c_int, sa_family_t, sockaddr, sockaddr_in, sockaddr_in6, sockaddr_storage, socklen_t, AF_INET,
-    AF_INET6, AF_UNIX,
+    AF_INET6,
 };
 use crate::Domain;
 
@@ -146,6 +149,7 @@ impl SockAddr {
     /// Constructs a `SockAddr` with the family `AF_UNIX` and the provided path.
     ///
     /// Returns an error if the path is longer than `SUN_LEN`.
+    #[cfg(not(target_os = "wasi"))]
     pub fn unix<P>(path: P) -> io::Result<SockAddr>
     where
         P: AsRef<Path>,
@@ -201,6 +205,7 @@ impl SockAddr {
 
     /// Returns true if this address is of a unix socket (for local interprocess communication),
     /// i.e. it is from the `AF_UNIX` family, false otherwise.
+    #[cfg(not(target_os = "wasi"))]
     pub fn is_unix(&self) -> bool {
         self.storage.ss_family == AF_UNIX as sa_family_t
     }
@@ -225,7 +230,7 @@ impl SockAddr {
                 ip,
                 port,
                 addr.sin6_flowinfo,
-                #[cfg(unix)]
+                #[cfg(any(unix, target_os = "wasi"))]
                 addr.sin6_scope_id,
                 #[cfg(windows)]
                 unsafe {
@@ -282,7 +287,10 @@ impl From<SocketAddrV4> for SockAddr {
             storage.sin_family = AF_INET as sa_family_t;
             storage.sin_port = addr.port().to_be();
             storage.sin_addr = crate::sys::to_in_addr(addr.ip());
-            storage.sin_zero = Default::default();
+            #[cfg(not(target_os = "wasi"))]
+            {
+                storage.sin_zero = Default::default();
+            }
             mem::size_of::<sockaddr_in>() as socklen_t
         };
         #[cfg(any(
@@ -317,7 +325,7 @@ impl From<SocketAddrV6> for SockAddr {
             storage.sin6_port = addr.port().to_be();
             storage.sin6_addr = crate::sys::to_in6_addr(addr.ip());
             storage.sin6_flowinfo = addr.flowinfo();
-            #[cfg(unix)]
+            #[cfg(any(unix, target_os = "wasi"))]
             {
                 storage.sin6_scope_id = addr.scope_id();
             }
@@ -401,6 +409,7 @@ mod tests {
         let addr = SockAddr::from(std);
         assert!(addr.is_ipv4());
         assert!(!addr.is_ipv6());
+        #[cfg(not(target_os = "wasi"))]
         assert!(!addr.is_unix());
         assert_eq!(addr.family(), AF_INET as sa_family_t);
         assert_eq!(addr.domain(), Domain::IPV4);
@@ -429,6 +438,7 @@ mod tests {
         let addr = SockAddr::from(std);
         assert!(addr.is_ipv6());
         assert!(!addr.is_ipv4());
+        #[cfg(not(target_os = "wasi"))]
         assert!(!addr.is_unix());
         assert_eq!(addr.family(), AF_INET6 as sa_family_t);
         assert_eq!(addr.domain(), Domain::IPV6);