Adding upstream version 3.3.4.upstream/3.3.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/src/contrib/os.h b/src/contrib/os.h
new file mode 100644
index 0000000..8d4a2e2
--- /dev/null
+++ b/src/contrib/os.h
@@ -0,0 +1,37 @@
+/*  Copyright (C) 2021 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <sys/utsname.h>
+
+inline static bool linux_at_least(unsigned version_first, unsigned version_second)
+{
+#if defined(__linux__)
+	struct utsname info;
+	unsigned first, second;
+	if (uname(&info) != 0 || sscanf(info.release, "%u.%u.", &first, &second) != 2) {
+		return false;
+	} else {
+		return first > version_first ||
+		       (first = version_first && second >= version_second);
+	}
+#else
+	return false;
+#endif
+}