tests: add test-rlimit-util

.gitignore

@@ -249,6 +249,7 @@
 /test-replace-var
 /test-resolve
 /test-ring
+/test-rlimit-util
 /test-sched-prio
 /test-set
 /test-sigbus

Makefile.am

@@ -1497,7 +1497,8 @@ tests += \
 	test-af-list \
 	test-arphrd-list \
 	test-dns-domain \
-	test-install-root
+	test-install-root \
+	test-rlimit-util
 
 if HAVE_ACL
 tests += \
@@ -1860,6 +1861,12 @@ test_acl_util_LDADD = \
 test_namespace_LDADD = \
 	libcore.la
 
+test_rlimit_util_SOURCES = \
+	src/test/test-rlimit-util.c
+
+test_rlimit_util_LDADD = \
+	libshared.la
+
 BUILT_SOURCES += \
 	src/test/test-hashmap-ordered.c
 

src/test/test-rlimit-util.c

@@ -0,0 +1,69 @@
+/***
+  This file is part of systemd
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/resource.h>
+
+#include "capability-util.h"
+#include "macro.h"
+#include "rlimit-util.h"
+#include "string-util.h"
+#include "util.h"
+
+int main(int argc, char *argv[]) {
+        struct rlimit old, new, high;
+        struct rlimit err = {
+                .rlim_cur = 10,
+                .rlim_max = 5,
+        };
+
+        log_parse_environment();
+        log_open();
+
+        assert_se(drop_capability(CAP_SYS_RESOURCE) == 0);
+
+        assert_se(getrlimit(RLIMIT_NOFILE, &old) == 0);
+        new.rlim_cur = MIN(5U, old.rlim_max);
+        new.rlim_max = MIN(10U, old.rlim_max);
+        assert_se(setrlimit(RLIMIT_NOFILE, &new) >= 0);
+
+        assert_se(rlimit_from_string("LimitNOFILE") == RLIMIT_NOFILE);
+        assert_se(rlimit_from_string("DefaultLimitNOFILE") == -1);
+
+        assert_se(streq_ptr(rlimit_to_string(RLIMIT_NOFILE), "LimitNOFILE"));
+        assert_se(rlimit_to_string(-1) == NULL);
+
+        assert_se(getrlimit(RLIMIT_NOFILE, &old) == 0);
+        assert_se(setrlimit_closest(RLIMIT_NOFILE, &old) == 0);
+        assert_se(getrlimit(RLIMIT_NOFILE, &new) == 0);
+        assert_se(old.rlim_cur == new.rlim_cur);
+        assert_se(old.rlim_max == new.rlim_max);
+
+        assert_se(getrlimit(RLIMIT_NOFILE, &old) == 0);
+        high = RLIMIT_MAKE_CONST(old.rlim_max + 1);
+        assert_se(setrlimit_closest(RLIMIT_NOFILE, &high) == 0);
+        assert_se(getrlimit(RLIMIT_NOFILE, &new) == 0);
+        assert_se(new.rlim_max == old.rlim_max);
+        assert_se(new.rlim_cur == new.rlim_max);
+
+        assert_se(getrlimit(RLIMIT_NOFILE, &old) == 0);
+        assert_se(setrlimit_closest(RLIMIT_NOFILE, &err) == -EINVAL);
+        assert_se(getrlimit(RLIMIT_NOFILE, &new) == 0);
+        assert_se(old.rlim_cur == new.rlim_cur);
+        assert_se(old.rlim_max == new.rlim_max);
+
+        return 0;
+}