moveonly: move IsSelectableSocket() from compat.h to sock.{h,cpp}

To be converted to a method of the `Sock` class.

2 files changed, 10 insertions, 0 deletions

diff --git a/src/util/sock.cpp b/src/util/sock.cpp
index 125dbc7f18..fed50444a9 100644
--- a/src/util/sock.cpp
+++ b/src/util/sock.cpp
@@ -117,6 +117,14 @@ int Sock::GetSockName(sockaddr* name, socklen_t* name_len) const
     return getsockname(m_socket, name, name_len);
 }
 
+bool IsSelectableSocket(const SOCKET& s) {
+#if defined(USE_POLL) || defined(WIN32)
+    return true;
+#else
+    return (s < FD_SETSIZE);
+#endif
+}
+
 bool Sock::Wait(std::chrono::milliseconds timeout, Event requested, Event* occurred) const
 {
     // We need a `shared_ptr` owning `this` for `WaitMany()`, but don't want
diff --git a/src/util/sock.h b/src/util/sock.h
index 38a7dc80d6..9ec53ec91d 100644
--- a/src/util/sock.h
+++ b/src/util/sock.h
@@ -267,6 +267,8 @@ private:
     void Close();
 };
 
+bool IsSelectableSocket(const SOCKET& s);
+
 /** Return readable error string for a network error code */
 std::string NetworkErrorString(int err);