add basic IP support in HermitCore

- add initial version to support sockets
- use TcpStream as test case
- HermitCore uses smoltcp as IP stack for pure Rust applications
- further functionalities (e.g. UDP support) will be added step by step

2 files changed, 156 insertions, 87 deletions

diff --git a/src/libstd/sys/hermit/mod.rs b/src/libstd/sys/hermit/mod.rs
index 1e4a53abdc7..958532b8fc4 100644
--- a/src/libstd/sys/hermit/mod.rs
+++ b/src/libstd/sys/hermit/mod.rs
@@ -93,9 +93,7 @@ pub unsafe extern "C" fn __rust_abort() {
 
 #[cfg(not(test))]
 pub fn init() {
-    unsafe {
-        let _ = net::init();
-    }
+    let _ = net::init();
 }
 
 #[cfg(not(test))]
diff --git a/src/libstd/sys/hermit/net.rs b/src/libstd/sys/hermit/net.rs
index 82917e71be1..377c3132c5a 100644
--- a/src/libstd/sys/hermit/net.rs
+++ b/src/libstd/sys/hermit/net.rs
@@ -1,291 +1,362 @@
 use crate::convert::TryFrom;
 use crate::fmt;
-use crate::io::{self, IoSlice, IoSliceMut};
+use crate::io::{self, ErrorKind, IoSlice, IoSliceMut};
 use crate::net::{Ipv4Addr, Ipv6Addr, Shutdown, SocketAddr};
 use crate::str;
+use crate::sys::hermit::abi;
 use crate::sys::{unsupported, Void};
 use crate::time::Duration;
 
-//// Iinitializes HermitCore's network stack
-pub unsafe fn init() -> io::Result<()> {
+/// Checks whether the HermitCore's socket interface has been started already, and
+/// if not, starts it.
+pub fn init() -> io::Result<()> {
+    if abi::network_init() < 0 {
+        return Err(io::Error::new(ErrorKind::Other, "Unable to initialize network interface"));
+    }
+
     Ok(())
 }
 
-pub struct TcpStream(Void);
+pub struct TcpStream(abi::Handle);
 
 impl TcpStream {
-    pub fn connect(_: io::Result<&SocketAddr>) -> io::Result<TcpStream> {
-        unsupported()
+    pub fn connect(addr: io::Result<&SocketAddr>) -> io::Result<TcpStream> {
+        let addr = addr?;
+
+        match abi::tcpstream::connect(addr.ip().to_string().as_bytes(), addr.port(), None) {
+            Ok(handle) => Ok(TcpStream(handle)),
+            _ => {
+                Err(io::Error::new(ErrorKind::Other, "Unable to initiate a connection on a socket"))
+            }
+        }
     }
 
-    pub fn connect_timeout(_: &SocketAddr, _: Duration) -> io::Result<TcpStream> {
-        unsupported()
+    pub fn connect_timeout(saddr: &SocketAddr, duration: Duration) -> io::Result<TcpStream> {
+        match abi::tcpstream::connect(
+            saddr.ip().to_string().as_bytes(),
+            saddr.port(),
+            Some(duration.as_millis() as u64),
+        ) {
+            Ok(handle) => Ok(TcpStream(handle)),
+            _ => {
+                Err(io::Error::new(ErrorKind::Other, "Unable to initiate a connection on a socket"))
+            }
+        }
     }
 
-    pub fn set_read_timeout(&self, _: Option<Duration>) -> io::Result<()> {
-        match self.0 {}
+    pub fn set_read_timeout(&self, duration: Option<Duration>) -> io::Result<()> {
+        abi::tcpstream::set_read_timeout(self.0, duration.map(|d| d.as_millis() as u64))
+            .map_err(|_| io::Error::new(ErrorKind::Other, "Unable to set timeout value"))
     }
 
-    pub fn set_write_timeout(&self, _: Option<Duration>) -> io::Result<()> {
-        match self.0 {}
+    pub fn set_write_timeout(&self, duration: Option<Duration>) -> io::Result<()> {
+        abi::tcpstream::set_write_timeout(self.0, duration.map(|d| d.as_millis() as u64))
+            .map_err(|_| io::Error::new(ErrorKind::Other, "Unable to set timeout value"))
     }
 
     pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
-        match self.0 {}
+        let duration = abi::tcpstream::get_read_timeout(self.0)
+            .map_err(|_| io::Error::new(ErrorKind::Other, "Unable to determine timeout value"))?;
+
+        Ok(duration.map(|d| Duration::from_millis(d)))
     }
 
     pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
-        match self.0 {}
+        let duration = abi::tcpstream::get_write_timeout(self.0)
+            .map_err(|_| io::Error::new(ErrorKind::Other, "Unable to determine timeout value"))?;
+
+        Ok(duration.map(|d| Duration::from_millis(d)))
     }
 
-    pub fn peek(&self, _: &mut [u8]) -> io::Result<usize> {
-        match self.0 {}
+    pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
+        abi::tcpstream::peek(self.0, buf)
+            .map_err(|_| io::Error::new(ErrorKind::Other, "set_nodelay failed"))
     }
 
-    pub fn read(&self, _: &mut [u8]) -> io::Result<usize> {
-        match self.0 {}
+    pub fn read(&self, buffer: &mut [u8]) -> io::Result<usize> {
+        self.read_vectored(&mut [IoSliceMut::new(buffer)])
     }
 
-    pub fn read_vectored(&self, _: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
-        match self.0 {}
+    pub fn read_vectored(&self, ioslice: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+        let mut size: usize = 0;
+
+        for i in ioslice.iter_mut() {
+            let mut pos: usize = 0;
+
+            while pos < i.len() {
+                let ret = abi::tcpstream::read(self.0, &mut i[pos..])
+                    .map_err(|_| io::Error::new(ErrorKind::Other, "Unable to read on socket"))?;
+
+                if ret == 0 {
+                    return Ok(size);
+                } else {
+                    size += ret;
+                    pos += ret;
+                }
+            }
+        }
+
+        Ok(size)
     }
 
-    pub fn write(&self, _: &[u8]) -> io::Result<usize> {
-        match self.0 {}
+    pub fn write(&self, buffer: &[u8]) -> io::Result<usize> {
+        self.write_vectored(&[IoSlice::new(buffer)])
     }
 
-    pub fn write_vectored(&self, _: &[IoSlice<'_>]) -> io::Result<usize> {
-        match self.0 {}
+    pub fn write_vectored(&self, ioslice: &[IoSlice<'_>]) -> io::Result<usize> {
+        let mut size: usize = 0;
+
+        for i in ioslice.iter() {
+            size += abi::tcpstream::write(self.0, i)
+                .map_err(|_| io::Error::new(ErrorKind::Other, "Unable to write on socket"))?;
+        }
+
+        Ok(size)
     }
 
     pub fn peer_addr(&self) -> io::Result<SocketAddr> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "peer_addr isn't supported"))
     }
 
     pub fn socket_addr(&self) -> io::Result<SocketAddr> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "socket_addr isn't supported"))
     }
 
-    pub fn shutdown(&self, _: Shutdown) -> io::Result<()> {
-        match self.0 {}
+    pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
+        abi::tcpstream::shutdown(self.0, how as i32)
+            .map_err(|_| io::Error::new(ErrorKind::Other, "unable to shutdown socket"))
     }
 
     pub fn duplicate(&self) -> io::Result<TcpStream> {
-        match self.0 {}
+        let handle = abi::tcpstream::duplicate(self.0)
+            .map_err(|_| io::Error::new(ErrorKind::Other, "unable to duplicate stream"))?;
+
+        Ok(TcpStream(handle))
     }
 
-    pub fn set_nodelay(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
+    pub fn set_nodelay(&self, mode: bool) -> io::Result<()> {
+        abi::tcpstream::set_nodelay(self.0, mode)
+            .map_err(|_| io::Error::new(ErrorKind::Other, "set_nodelay failed"))
     }
 
     pub fn nodelay(&self) -> io::Result<bool> {
-        match self.0 {}
+        abi::tcpstream::nodelay(self.0)
+            .map_err(|_| io::Error::new(ErrorKind::Other, "nodelay failed"))
     }
 
-    pub fn set_ttl(&self, _: u32) -> io::Result<()> {
-        match self.0 {}
+    pub fn set_ttl(&self, tll: u32) -> io::Result<()> {
+        abi::tcpstream::set_tll(self.0, tll)
+            .map_err(|_| io::Error::new(ErrorKind::Other, "unable to set TTL"))
     }
 
     pub fn ttl(&self) -> io::Result<u32> {
-        match self.0 {}
+        abi::tcpstream::get_tll(self.0)
+            .map_err(|_| io::Error::new(ErrorKind::Other, "unable to get TTL"))
     }
 
     pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "take_error isn't supported"))
     }
 
-    pub fn set_nonblocking(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
+    pub fn set_nonblocking(&self, mode: bool) -> io::Result<()> {
+        abi::tcpstream::set_nonblocking(self.0, mode)
+            .map_err(|_| io::Error::new(ErrorKind::Other, "unable to set blocking mode"))
+    }
+}
+
+impl Drop for TcpStream {
+    fn drop(&mut self) {
+        let _ = abi::tcpstream::close(self.0);
     }
 }
 
 impl fmt::Debug for TcpStream {
     fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {}
+        Ok(())
     }
 }
 
-pub struct TcpListener(Void);
+pub struct TcpListener(abi::Handle);
 
 impl TcpListener {
     pub fn bind(_: io::Result<&SocketAddr>) -> io::Result<TcpListener> {
-        unsupported()
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn socket_addr(&self) -> io::Result<SocketAddr> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn accept(&self) -> io::Result<(TcpStream, SocketAddr)> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn duplicate(&self) -> io::Result<TcpListener> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn set_ttl(&self, _: u32) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn ttl(&self) -> io::Result<u32> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn set_only_v6(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn only_v6(&self) -> io::Result<bool> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn set_nonblocking(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 }
 
 impl fmt::Debug for TcpListener {
     fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {}
+        Ok(())
     }
 }
 
-pub struct UdpSocket(Void);
+pub struct UdpSocket(abi::Handle);
 
 impl UdpSocket {
     pub fn bind(_: io::Result<&SocketAddr>) -> io::Result<UdpSocket> {
-        unsupported()
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn peer_addr(&self) -> io::Result<SocketAddr> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn socket_addr(&self) -> io::Result<SocketAddr> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn recv_from(&self, _: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn peek_from(&self, _: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn send_to(&self, _: &[u8], _: &SocketAddr) -> io::Result<usize> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn duplicate(&self) -> io::Result<UdpSocket> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn set_read_timeout(&self, _: Option<Duration>) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn set_write_timeout(&self, _: Option<Duration>) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn set_broadcast(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn broadcast(&self) -> io::Result<bool> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn set_multicast_loop_v4(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn multicast_loop_v4(&self) -> io::Result<bool> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn set_multicast_ttl_v4(&self, _: u32) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn multicast_ttl_v4(&self) -> io::Result<u32> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn set_multicast_loop_v6(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn multicast_loop_v6(&self) -> io::Result<bool> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn join_multicast_v4(&self, _: &Ipv4Addr, _: &Ipv4Addr) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn join_multicast_v6(&self, _: &Ipv6Addr, _: u32) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn leave_multicast_v4(&self, _: &Ipv4Addr, _: &Ipv4Addr) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn leave_multicast_v6(&self, _: &Ipv6Addr, _: u32) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn set_ttl(&self, _: u32) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn ttl(&self) -> io::Result<u32> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn set_nonblocking(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn recv(&self, _: &mut [u8]) -> io::Result<usize> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn peek(&self, _: &mut [u8]) -> io::Result<usize> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn send(&self, _: &[u8]) -> io::Result<usize> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 
     pub fn connect(&self, _: io::Result<&SocketAddr>) -> io::Result<()> {
-        match self.0 {}
+        Err(io::Error::new(ErrorKind::Other, "not supported"))
     }
 }
 
 impl fmt::Debug for UdpSocket {
     fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {}
+        Ok(())
     }
 }