Fix Clippy warnings

Author: Thomasdezeeuw

src/sys/unix.rs

@@ -612,7 +612,7 @@ pub(crate) fn poll_connect(socket: &crate::Socket, timeout: Duration) -> io::Res
         }
 
         let timeout = (timeout - elapsed).as_millis();
-        let timeout = clamp(timeout, 1, c_int::MAX as u128) as c_int;
+        let timeout = timeout.clamp(1, c_int::MAX as u128) as c_int;
 
         match syscall!(poll(&mut pollfd, 1, timeout)) {
             Ok(0) => return Err(io::ErrorKind::TimedOut.into()),
@@ -638,20 +638,6 @@ pub(crate) fn poll_connect(socket: &crate::Socket, timeout: Duration) -> io::Res
     }
 }
 
-// TODO: use clamp from std lib, stable since 1.50.
-fn clamp<T>(value: T, min: T, max: T) -> T
-where
-    T: Ord,
-{
-    if value <= min {
-        min
-    } else if value >= max {
-        max
-    } else {
-        value
-    }
-}
-
 pub(crate) fn listen(fd: Socket, backlog: c_int) -> io::Result<()> {
     syscall!(listen(fd, backlog)).map(|_| ())
 }
@@ -2064,14 +2050,14 @@ impl crate::Socket {
         unsafe { getsockopt(self.as_raw(), libc::SOL_DCCP, libc::DCCP_SOCKOPT_TX_CCID) }
     }
 
-    /// Get the value of the `DCCP_SOCKOPT_XX_CCID` option on this socket.
+    /// Get the value of the `DCCP_SOCKOPT_RX_CCID` option on this socket.
     ///
     /// For more information about this option see [`set_dccp_ccid`].
     ///
     /// [`set_dccp_ccid`]: crate::Socket::set_dccp_ccid
     #[cfg(all(feature = "all", target_os = "linux"))]
     #[cfg_attr(docsrs, doc(cfg(feature = "all", target_os = "linux")))]
-    pub fn dccp_tx_ccid(&self) -> io::Result<u32> {
+    pub fn dccp_xx_ccid(&self) -> io::Result<u32> {
         unsafe { getsockopt(self.as_raw(), libc::SOL_DCCP, libc::DCCP_SOCKOPT_RX_CCID) }
     }
 
@@ -2224,7 +2210,7 @@ impl crate::Socket {
     #[cfg_attr(docsrs, doc(cfg(feature = "all", target_os = "linux")))]
     pub fn dccp_available_ccids<const N: usize>(&self) -> io::Result<CcidEndpoints<N>> {
         let mut endpoints = [0; N];
-        let mut length = buf.len() as libc::socklen_t;
+        let mut length = endpoints.len() as libc::socklen_t;
         syscall!(getsockopt(
             self.as_raw(),
             libc::SOL_DCCP,
@@ -2255,6 +2241,7 @@ impl crate::Socket {
 /// See [`Socket::dccp_available_ccids`].
 #[cfg(all(feature = "all", target_os = "linux"))]
 #[cfg_attr(docsrs, doc(cfg(feature = "all", target_os = "linux")))]
+#[derive(Debug)]
 pub struct CcidEndpoints<const N: usize> {
     endpoints: [u8; N],
     length: u32,