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/*
* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "precompiled.hpp"
#ifdef LINUX
#include "runtime/os.hpp"
#include "cgroupSubsystem_linux.hpp"
#include "unittest.hpp"
#include "utilities/globalDefinitions.hpp"
#include <stdio.h>
// Utilities
bool file_exists(const char* filename) {
struct stat st;
return os::stat(filename, &st) == 0;
}
char* temp_file(const char* prefix) {
const testing::TestInfo* test_info = ::testing::UnitTest::GetInstance()->current_test_info();
stringStream path;
path.print_raw(os::get_temp_directory());
path.print_raw(os::file_separator());
path.print("%s-test-jdk.pid%d.%s.%s", prefix, os::current_process_id(),
test_info->test_case_name(), test_info->name());
return path.as_string(true);
}
void delete_file(const char* filename) {
if (!file_exists(filename)) {
return;
}
int ret = remove(filename);
EXPECT_TRUE(ret == 0 || errno == ENOENT) << "failed to remove file '" << filename << "': "
<< os::strerror(errno) << " (" << errno << ")";
}
class TestController : public CgroupController {
public:
char* subsystem_path() override {
// The real subsystem is in /tmp/, generated by temp_file()
return (char*)"/";
};
};
void fill_file(const char* path, const char* content) {
delete_file(path);
FILE* fp = os::fopen(path, "w");
if (fp == nullptr) {
return;
}
if (content != nullptr) {
fprintf(fp, "%s", content);
}
fclose(fp);
}
TEST(cgroupTest, SubSystemFileLineContentsMultipleLinesErrorCases) {
TestController my_controller{};
const char* test_file = temp_file("cgroups");
int x = 0;
char s[1024];
int err = 0;
s[0] = '\0';
fill_file(test_file, "foo ");
err = subsystem_file_line_contents(&my_controller, test_file, "foo", "%s", &s);
EXPECT_NE(err, 0) << "Value must not be missing in key/value case";
s[0] = '\0';
fill_file(test_file, "faulty_start foo bar");
err = subsystem_file_line_contents(&my_controller, test_file, "foo", "%s", &s);
EXPECT_NE(err, 0) << "Key must be at start";
s[0] = '\0';
fill_file(test_file, "foof bar");
err = subsystem_file_line_contents(&my_controller, test_file, "foo", "%s", &s);
EXPECT_NE(err, 0) << "Key must be exact match";
// Cleanup
delete_file(test_file);
}
TEST(cgroupTest, SubSystemFileLineContentsMultipleLinesSuccessCases) {
TestController my_controller{};
const char* test_file = temp_file("cgroups");
int x = 0;
char s[1024];
int err = 0;
s[0] = '\0';
fill_file(test_file, "foo bar");
err = subsystem_file_line_contents(&my_controller, test_file, "foo", "%s", &s);
EXPECT_EQ(err, 0);
EXPECT_STREQ(s, "bar") << "Incorrect!";
s[0] = '\0';
fill_file(test_file, "foo\tbar");
err = subsystem_file_line_contents(&my_controller, test_file, "foo", "%s", &s);
EXPECT_EQ(err, 0);
EXPECT_STREQ(s, "bar") << "Incorrect!";
s[0] = '\0';
fill_file(test_file, "foof bar\nfoo car");
err = subsystem_file_line_contents(&my_controller, test_file, "foo", "%s", &s);
EXPECT_EQ(err, 0);
EXPECT_STREQ(s, "car");
s[0] = '\0';
fill_file(test_file, "foo\ttest\nfoot car");
err = subsystem_file_line_contents(&my_controller, test_file, "foo", "%s", &s);
EXPECT_EQ(err, 0);
EXPECT_STREQ(s, "test");
s[0] = '\0';
fill_file(test_file, "foo 1\nfoo car");
err = subsystem_file_line_contents(&my_controller, test_file, "foo", "%s", &s);
EXPECT_EQ(err, 0);
EXPECT_STREQ(s, "1");
s[0] = '\0';
fill_file(test_file, "max 10000");
err = subsystem_file_line_contents(&my_controller, test_file, nullptr, "%s %*d", &s);
EXPECT_EQ(err, 0);
EXPECT_STREQ(s, "max");
x = -3;
fill_file(test_file, "max 10001");
err = subsystem_file_line_contents(&my_controller, test_file, nullptr, "%*s %d", &x);
EXPECT_EQ(err, 0);
EXPECT_EQ(x, 10001);
// Cleanup
delete_file(test_file);
}
TEST(cgroupTest, SubSystemFileLineContentsSingleLine) {
TestController my_controller{};
const char* test_file = temp_file("cgroups");
int x = 0;
char s[1024];
int err = 0;
fill_file(test_file, "foo");
err = subsystem_file_line_contents(&my_controller, test_file, nullptr, "%s", &s);
EXPECT_EQ(err, 0);
EXPECT_STREQ(s, "foo");
fill_file(test_file, "1337");
err = subsystem_file_line_contents(&my_controller, test_file, nullptr, "%d", &x);
EXPECT_EQ(err, 0);
EXPECT_EQ(x, 1337) << "Wrong value for x";
s[0] = '\0';
fill_file(test_file, "1337");
err = subsystem_file_line_contents(&my_controller, test_file, nullptr, "%s", &s);
EXPECT_EQ(err, 0);
EXPECT_STREQ(s, "1337");
x = -1;
fill_file(test_file, nullptr);
err = subsystem_file_line_contents(&my_controller, test_file, nullptr, "%d", &x);
EXPECT_NE(err, 0) << "Empty file should've failed";
EXPECT_EQ(x, -1) << "x was altered";
jlong y;
fill_file(test_file, "1337");
err = subsystem_file_line_contents(&my_controller, test_file, nullptr, JLONG_FORMAT, &y);
EXPECT_EQ(err, 0);
EXPECT_EQ(y, 1337) << "Wrong value for y";
julong z;
fill_file(test_file, "1337");
err = subsystem_file_line_contents(&my_controller, test_file, nullptr, JULONG_FORMAT, &z);
EXPECT_EQ(err, 0);
EXPECT_EQ(z, (julong)1337) << "Wrong value for z";
// Cleanup
delete_file(test_file);
}
#endif // LINUX
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