From afe142997b61f7a06563e3a7d7203c2546c7675a Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 17 Nov 2015 02:15:55 +0000
Subject: [PATCH] init.c: is_socket

* ext/socket/init.c (is_socket): extract predicate to see if the
  given fd is a socket.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52605 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/socket/init.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/ext/socket/init.c b/ext/socket/init.c
index 45070d5d12..df32565b80 100644
--- a/ext/socket/init.c
+++ b/ext/socket/init.c
@@ -42,24 +42,29 @@ rsock_raise_socket_error(const char *reason, int error)
     rb_raise(rb_eSocket, "%s: %s", reason, gai_strerror(error));
 }
 
-VALUE
-rsock_init_sock(VALUE sock, int fd)
+#ifdef _WIN32
+#define is_socket(fd) rb_w32_is_socket(fd)
+#else
+static int
+is_socket(int fd)
 {
-    rb_io_t *fp;
-#ifndef _WIN32
     struct stat sbuf;
 
     if (fstat(fd, &sbuf) < 0)
         rb_sys_fail("fstat(2)");
-    rb_update_max_fd(fd);
-    if (!S_ISSOCK(sbuf.st_mode))
-        rb_raise(rb_eArgError, "not a socket file descriptor");
-#else
-    rb_update_max_fd(fd);
-    if (!rb_w32_is_socket(fd))
-        rb_raise(rb_eArgError, "not a socket file descriptor");
+    return S_ISSOCK(sbuf.st_mode);
+}
 #endif
 
+VALUE
+rsock_init_sock(VALUE sock, int fd)
+{
+    rb_io_t *fp;
+
+    rb_update_max_fd(fd);
+    if (!is_socket(fd))
+        rb_raise(rb_eArgError, "not a socket file descriptor");
+
     MakeOpenFile(sock, fp);
     fp->fd = fd;
     fp->mode = FMODE_READWRITE|FMODE_DUPLEX;