core: add command /sys to show resource limits and usage

tests/unit/core/test-core-sys.cpp

@@ -0,0 +1,78 @@
+/*
+ * test-core-sys.cpp - test system functions
+ *
+ * Copyright (C) 2023 Sébastien Helleu <flashcode@flashtux.org>
+ *
+ * This file is part of WeeChat, the extensible chat client.
+ *
+ * WeeChat 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.
+ *
+ * WeeChat 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 WeeChat.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "CppUTest/TestHarness.h"
+
+#include "tests/tests.h"
+
+extern "C"
+{
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+#include "src/core/wee-string.h"
+#include "src/core/wee-util.h"
+}
+
+TEST_GROUP(CoreSys)
+{
+};
+
+/*
+ * Tests functions:
+ *   sys_setrlimit_resource
+ */
+
+TEST(CoreSys, SetrlimitResource)
+{
+    /* TODO: write tests */
+}
+
+/*
+ * Tests functions:
+ *   sys_setrlimit
+ */
+
+TEST(CoreSys, Setrlimit)
+{
+    /* TODO: write tests */
+}
+
+/*
+ * Tests functions:
+ *   sys_display_rlimit
+ */
+
+TEST(CoreSys, DisplayRlimit)
+{
+    /* TODO: write tests */
+}
+
+/*
+ * Tests functions:
+ *   sys_display_rusage
+ */
+
+TEST(CoreSys, DisplayRusage)
+{
+    /* TODO: write tests */
+}