https://git.ruby-lang.org/ruby.git/commit/?id=6d946665bd

From 6d946665bd79a93fb98b2d25400d1b6174472302 Mon Sep 17 00:00:00 2001
From: Masaki Matsushita <glass.saga@g...>
Date: Sat, 29 Aug 2020 17:18:59 +0900
Subject: Show deprecation warning on Socket.gethostbyname and
 Socket.gethostbyaddr


diff --git a/ext/socket/socket.c b/ext/socket/socket.c
index edf5f00..dc6588f 100644
--- a/ext/socket/socket.c
+++ b/ext/socket/socket.c
@@ -965,6 +965,7 @@ sock_sockaddr(struct sockaddr *addr, socklen_t len) https://github.com/ruby/ruby/blob/trunk/ext/socket/socket.c#L965
 static VALUE
 sock_s_gethostbyname(VALUE obj, VALUE host)
 {
+    rb_warn("Socket.gethostbyname is deprecated; use Addrinfo.getaddrinfo instead.");
     struct rb_addrinfo *res =
 	rsock_addrinfo(host, Qnil, AF_UNSPEC, SOCK_STREAM, AI_CANONNAME);
     return rsock_make_hostent(host, res, sock_sockaddr);
@@ -1004,6 +1005,8 @@ sock_s_gethostbyaddr(int argc, VALUE *argv, VALUE _) https://github.com/ruby/ruby/blob/trunk/ext/socket/socket.c#L1005
     VALUE ary, names;
     int t = AF_INET;
 
+    rb_warn("Socket.gethostbyaddr is deprecated; use Addrinfo#getnameinfo instead.");
+
     rb_scan_args(argc, argv, "11", &addr, &family);
     StringValue(addr);
     if (!NIL_P(family)) {
-- 
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