From 1009d0016878ca7f0aff648a7e655b92fdd5774d Mon Sep 17 00:00:00 2001
From: Norman Feske <norman.feske@genode-labs.com>
Date: Thu, 21 Feb 2013 16:39:46 +0100
Subject: [PATCH] libc: Handle dup2 with two equal arguments

---
 libports/src/lib/libc/file_operations.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libports/src/lib/libc/file_operations.cc b/libports/src/lib/libc/file_operations.cc
index 5537abf025..d9ebc3f4b3 100644
--- a/libports/src/lib/libc/file_operations.cc
+++ b/libports/src/lib/libc/file_operations.cc
@@ -340,6 +340,9 @@ extern "C" int _dup2(int libc_fd, int new_libc_fd)
 	if (!fd || !fd->plugin)
 		return INVALID_FD;
 
+	if (libc_fd == new_libc_fd)
+		return libc_fd;
+
 	/*
 	 * Check if 'new_libc_fd' is already in use. If so, close it before
 	 * allocating it again.