From 59c60b80316731d3be952f0758d59e2fa87550d0 Mon Sep 17 00:00:00 2001
From: Norman Feske <norman.feske@genode-labs.com>
Date: Tue, 24 Sep 2019 10:10:26 +0200
Subject: [PATCH] test-libc: test double dup2, dup

Issue #3477
Issue #3505
---
 repos/libports/src/test/libc/main.cc | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/repos/libports/src/test/libc/main.cc b/repos/libports/src/test/libc/main.cc
index 40f184d1c..49170b16c 100644
--- a/repos/libports/src/test/libc/main.cc
+++ b/repos/libports/src/test/libc/main.cc
@@ -152,6 +152,31 @@ int main(int argc, char **argv)
 		}
 	}
 
+	{
+		/* test dup of stderr (issue #3477) */
+		int const new_fd = dup(STDERR_FILENO);
+		if (new_fd < 0) {
+			printf("dup of stderr failed\n");
+			++error_count;
+		} else {
+			close(new_fd);
+		}
+	}
+
+	{
+		/* test double dup2 (issue #3505) */
+		int const new_fd = 17, another_new_fd = 18;
+		if (dup2(STDERR_FILENO, new_fd)         == new_fd
+		 && dup2(STDERR_FILENO, another_new_fd) == another_new_fd) {
+
+			close(new_fd);
+			close(another_new_fd);
+		} else {
+			printf("dup2 of stderr failed\n");
+			++error_count;
+		}
+	}
+
 	perror("perror");
 
 	struct timespec ts;