1 files changed, 13 insertions, 0 deletions
diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index 295e71d34aba..90aadad31f6c 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -238,6 +238,19 @@ static __attribute__((unused))
 int sys_dup2(int old, int new)
 {
 #if defined(__NR_dup3)
+	int ret, nr_fcntl;
+
+#ifdef __NR_fcntl64
+	nr_fcntl = __NR_fcntl64;
+#else
+	nr_fcntl = __NR_fcntl;
+#endif
+
+	if (old == new) {
+		ret = my_syscall2(nr_fcntl, old, F_GETFD);
+		return ret < 0 ? ret : old;
+	}
+
 	return my_syscall3(__NR_dup3, old, new, 0);
 #elif defined(__NR_dup2)
 	return my_syscall2(__NR_dup2, old, new);