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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <signal.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "gtest/gtest.h"
#include "absl/time/clock.h"
#include "absl/time/time.h"
#include "test/util/logging.h"
#include "test/util/memory_util.h"
#include "test/util/signal_util.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
TEST(GetrusageTest, BasicFork) {
pid_t pid = fork();
if (pid == 0) {
struct rusage rusage_self;
TEST_PCHECK(getrusage(RUSAGE_SELF, &rusage_self) == 0);
struct rusage rusage_children;
TEST_PCHECK(getrusage(RUSAGE_CHILDREN, &rusage_children) == 0);
// The child has consumed some memory.
TEST_CHECK(rusage_self.ru_maxrss != 0);
// The child has no children of its own.
TEST_CHECK(rusage_children.ru_maxrss == 0);
_exit(0);
}
ASSERT_THAT(pid, SyscallSucceeds());
int status;
ASSERT_THAT(RetryEINTR(waitpid)(pid, &status, 0), SyscallSucceeds());
struct rusage rusage_self;
ASSERT_THAT(getrusage(RUSAGE_SELF, &rusage_self), SyscallSucceeds());
struct rusage rusage_children;
ASSERT_THAT(getrusage(RUSAGE_CHILDREN, &rusage_children), SyscallSucceeds());
// The parent has consumed some memory.
EXPECT_GT(rusage_self.ru_maxrss, 0);
// The child has consumed some memory, and because it has exited we can get
// its max RSS.
EXPECT_GT(rusage_children.ru_maxrss, 0);
}
// Verifies that a process can get the max resident set size of its grandchild,
// i.e. that maxrss propagates correctly from children to waiting parents.
TEST(GetrusageTest, Grandchild) {
constexpr int kGrandchildSizeKb = 1024;
pid_t pid = fork();
if (pid == 0) {
pid = fork();
if (pid == 0) {
int flags = MAP_ANONYMOUS | MAP_POPULATE | MAP_PRIVATE;
void *addr =
mmap(nullptr, kGrandchildSizeKb * 1024, PROT_WRITE, flags, -1, 0);
TEST_PCHECK(addr != MAP_FAILED);
} else {
int status;
TEST_PCHECK(RetryEINTR(waitpid)(pid, &status, 0) == pid);
}
_exit(0);
}
ASSERT_THAT(pid, SyscallSucceeds());
int status;
ASSERT_THAT(RetryEINTR(waitpid)(pid, &status, 0), SyscallSucceeds());
struct rusage rusage_self;
ASSERT_THAT(getrusage(RUSAGE_SELF, &rusage_self), SyscallSucceeds());
struct rusage rusage_children;
ASSERT_THAT(getrusage(RUSAGE_CHILDREN, &rusage_children), SyscallSucceeds());
// The parent has consumed some memory.
EXPECT_GT(rusage_self.ru_maxrss, 0);
// The child should consume next to no memory, but the grandchild will
// consume at least 1MB. Verify that usage bubbles up to the grandparent.
EXPECT_GT(rusage_children.ru_maxrss, kGrandchildSizeKb);
}
// Verifies that processes ignoring SIGCHLD do not have updated child maxrss
// updated.
TEST(GetrusageTest, IgnoreSIGCHLD) {
struct sigaction sa;
sa.sa_handler = SIG_IGN;
sa.sa_flags = 0;
auto cleanup = ASSERT_NO_ERRNO_AND_VALUE(ScopedSigaction(SIGCHLD, sa));
pid_t pid = fork();
if (pid == 0) {
struct rusage rusage_self;
TEST_PCHECK(getrusage(RUSAGE_SELF, &rusage_self) == 0);
// The child has consumed some memory.
TEST_CHECK(rusage_self.ru_maxrss != 0);
_exit(0);
}
ASSERT_THAT(pid, SyscallSucceeds());
int status;
ASSERT_THAT(RetryEINTR(waitpid)(pid, &status, 0),
SyscallFailsWithErrno(ECHILD));
struct rusage rusage_self;
ASSERT_THAT(getrusage(RUSAGE_SELF, &rusage_self), SyscallSucceeds());
struct rusage rusage_children;
ASSERT_THAT(getrusage(RUSAGE_CHILDREN, &rusage_children), SyscallSucceeds());
// The parent has consumed some memory.
EXPECT_GT(rusage_self.ru_maxrss, 0);
// The child's maxrss should not have propagated up.
EXPECT_EQ(rusage_children.ru_maxrss, 0);
}
// Verifies that zombie processes do not update their parent's maxrss. Only
// reaped processes should do this.
TEST(GetrusageTest, IgnoreZombie) {
pid_t pid = fork();
if (pid == 0) {
struct rusage rusage_self;
TEST_PCHECK(getrusage(RUSAGE_SELF, &rusage_self) == 0);
struct rusage rusage_children;
TEST_PCHECK(getrusage(RUSAGE_CHILDREN, &rusage_children) == 0);
// The child has consumed some memory.
TEST_CHECK(rusage_self.ru_maxrss != 0);
// The child has no children of its own.
TEST_CHECK(rusage_children.ru_maxrss == 0);
_exit(0);
}
ASSERT_THAT(pid, SyscallSucceeds());
// Give the child time to exit. Because we don't call wait, the child should
// remain a zombie.
absl::SleepFor(absl::Seconds(5));
struct rusage rusage_self;
ASSERT_THAT(getrusage(RUSAGE_SELF, &rusage_self), SyscallSucceeds());
struct rusage rusage_children;
ASSERT_THAT(getrusage(RUSAGE_CHILDREN, &rusage_children), SyscallSucceeds());
// The parent has consumed some memory.
EXPECT_GT(rusage_self.ru_maxrss, 0);
// The child has consumed some memory, but hasn't been reaped.
EXPECT_EQ(rusage_children.ru_maxrss, 0);
}
TEST(GetrusageTest, Wait4) {
pid_t pid = fork();
if (pid == 0) {
struct rusage rusage_self;
TEST_PCHECK(getrusage(RUSAGE_SELF, &rusage_self) == 0);
struct rusage rusage_children;
TEST_PCHECK(getrusage(RUSAGE_CHILDREN, &rusage_children) == 0);
// The child has consumed some memory.
TEST_CHECK(rusage_self.ru_maxrss != 0);
// The child has no children of its own.
TEST_CHECK(rusage_children.ru_maxrss == 0);
_exit(0);
}
ASSERT_THAT(pid, SyscallSucceeds());
struct rusage rusage_children;
int status;
ASSERT_THAT(RetryEINTR(wait4)(pid, &status, 0, &rusage_children),
SyscallSucceeds());
// The child has consumed some memory, and because it has exited we can get
// its max RSS.
EXPECT_GT(rusage_children.ru_maxrss, 0);
}
} // namespace
} // namespace testing
} // namespace gvisor
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