https://git.ruby-lang.org/ruby.git/commit/?id=ee48c9cda6

From ee48c9cda6e918f8da4b23d3ff4fabf7357f4a95 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 21 Apr 2022 14:16:26 +0900
Subject: [Win32] allow pipe in flock

---
 win32/win32.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/win32/win32.c b/win32/win32.c
index ea9624876c..607603cf04 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -4298,6 +4298,8 @@ void setprotoent (int stayopen) {} https://github.com/ruby/ruby/blob/trunk/win32/win32.c#L4298
 void setservent (int stayopen) {}
 #endif
 
+int rb_w32_set_nonblock2(int fd, int nonblock);
+
 /* License: Ruby's */
 static int
 setfl(SOCKET sock, int arg)
@@ -4373,16 +4375,10 @@ fcntl(int fd, int cmd, ...) https://github.com/ruby/ruby/blob/trunk/win32/win32.c#L4375
 
     switch (cmd) {
       case F_SETFL: {
-	SOCKET sock = TO_SOCKET(fd);
-	if (!is_socket(sock)) {
-	    errno = EBADF;
-	    return -1;
-	}
-
 	va_start(va, cmd);
 	arg = va_arg(va, int);
 	va_end(va);
-	return setfl(sock, arg);
+	return rb_w32_set_nonblock2(fd, arg);
       }
       case F_DUPFD: case F_DUPFD_CLOEXEC: {
 	int ret;
-- 
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