From 0a63c4d5fbbbfae9aba92c78e39b1521b90f1b06 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 25 Jul 2019 06:39:40 +0900
Subject: Fix errno at seeking socket/pipe on Windows

[Bug #12230]
---
 win32/win32.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'win32')

diff --git a/win32/win32.c b/win32/win32.c
index d28bd56452..825b42399c 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -5845,6 +5845,17 @@ rb_w32_lstati128(const char *path, struct stati128 *st)
     return w32_stati128(path, st, filecp(), TRUE);
 }
 
+off_t
+rb_w32_lseek(int fd, off_t ofs, int whence)
+{
+    SOCKET sock = TO_SOCKET(fd);
+    if (is_socket(sock) || is_pipe(sock)) {
+        errno = ESPIPE;
+        return -1;
+    }
+    return _lseeki64(fd, ofs, whence);
+}
+
 /* License: Ruby's */
 int
 rb_w32_access(const char *path, int mode)
-- 
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