Remove internal sort from getipaddrs (#32260)

NEWS.md

@@ -52,6 +52,11 @@ Standard library changes
 
 * Fixed `repr` such that it displays `Time` as it would be entered in Julia ([#32103]).
 
+#### Sockets
+
+* `getipaddrs` returns IP addresses in the order provided by libuv ([#32260]).
+* `getipaddr` prefers to return the first `IPv4` interface address provided by libuv ([#32260]).
+
 #### Statistics
 
 * `mean` now accepts both a function argument and a `dims` keyword ([#31576]).

stdlib/Sockets/src/addrinfo.jl

@@ -234,10 +234,14 @@ ip"fe80::9731:35af:e1c5:6e49"
 """
 function getipaddr(addr_type::Type{T}) where T<:IPAddr
     addrs = getipaddrs(addr_type)
+
     if length(addrs) == 0
         error("No networking interface available")
     end
-    return addrs[1]
+
+    # Prefer the first IPv4 address
+    i = something(findfirst(ip -> ip isa IPv4, addrs), 1)
+    return addrs[i]
 end
 getipaddr() = getipaddr(IPv4)
 
@@ -295,14 +299,5 @@ function getipaddrs(addr_type::Type{T}=IPAddr; loopback::Bool=false) where T<:IP
         end
     end
     ccall(:uv_free_interface_addresses, Cvoid, (Ptr{UInt8}, Int32), addr, count)
-    sort!(addresses, lt=(addr1,addr2) -> begin
-        if addr1 isa IPv4 && addr2 isa IPv6
-            return true
-        elseif addr1 isa IPv6 && addr2 isa IPv4
-            return false
-        else
-            return addr1 < addr2
-        end
-    end)
     return addresses
 end