Add 'get/set SO_RCVBUF' methods to the pub interface

src/socket.rs

@@ -526,6 +526,26 @@ impl Socket {
         )?;
         Ok(res == 1)
     }
+
+    /// Sets socket receive buffer in bytes.
+    /// The kernel doubles this value (to allow space for bookkeeping overhead),
+    /// and this doubled value is returned by [get_rx_buf_sz].(see socket(7)
+    /// The default value is set by the proc/sys/net/core/rmem_default file, and the maximum
+    /// allowed value is set by the /proc/sys/net/core/rmem_max
+    /// file. The minimum (doubled) value for this option is 256.
+    pub fn set_rx_buf_sz<T>(&self, size: T) -> Result<()> {
+        setsockopt(self.0, libc::SOL_SOCKET, libc::SO_RCVBUF, size)
+    }
+
+    /// Gets socket receive buffer in bytes
+    pub fn get_rx_buf_sz(&self) -> Result<usize> {
+        let res = getsockopt::<libc::c_int>(
+            self.0,
+            libc::SOL_SOCKET,
+            libc::SO_RCVBUF,
+        )?;
+        Ok(res as usize)
+    }
 }
 
 /// Wrapper around `getsockopt`: