Replace cvt function with a new syscall macro

This removes a function call and reduces the scope of many unsafe calls.

Also removes the One trait as it is no longer used.

Author: Thomasdezeeuw

src/lib.rs

@@ -88,7 +88,6 @@ macro_rules! impl_debug {
 
 mod sockaddr;
 mod socket;
-mod utils;
 
 #[cfg(test)]
 mod tests;