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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.
#ifndef GVISOR_TEST_UTIL_TIMER_UTIL_H_
#define GVISOR_TEST_UTIL_TIMER_UTIL_H_
#include <errno.h>
#ifdef __linux__
#include <sys/syscall.h>
#endif
#include <sys/time.h>
#include <functional>
#include "gmock/gmock.h"
#include "absl/time/time.h"
#include "test/util/cleanup.h"
#include "test/util/logging.h"
#include "test/util/posix_error.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
// From Linux's include/uapi/asm-generic/siginfo.h.
#ifndef sigev_notify_thread_id
#define sigev_notify_thread_id _sigev_un._tid
#endif
// Returns the current time.
absl::Time Now(clockid_t id);
// MonotonicTimer is a simple timer that uses a monotonic clock.
class MonotonicTimer {
public:
MonotonicTimer() {}
absl::Duration Duration() {
struct timespec ts;
TEST_CHECK(clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
return absl::TimeFromTimespec(ts) - start_;
}
void Start() {
struct timespec ts;
TEST_CHECK(clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
start_ = absl::TimeFromTimespec(ts);
}
protected:
absl::Time start_;
};
// Sets the given itimer and returns a cleanup function that restores the
// previous itimer when it goes out of scope.
inline PosixErrorOr<Cleanup> ScopedItimer(int which,
struct itimerval const& new_value) {
struct itimerval old_value;
int rc = setitimer(which, &new_value, &old_value);
MaybeSave();
if (rc < 0) {
return PosixError(errno, "setitimer failed");
}
return Cleanup(std::function<void(void)>([which, old_value] {
EXPECT_THAT(setitimer(which, &old_value, nullptr), SyscallSucceeds());
}));
}
#ifdef __linux__
// RAII type for a kernel "POSIX" interval timer. (The kernel provides system
// calls such as timer_create that behave very similarly, but not identically,
// to those described by timer_create(2); in particular, the kernel does not
// implement SIGEV_THREAD. glibc builds POSIX-compliant interval timers based on
// these kernel interval timers.)
//
// Compare implementation to FileDescriptor.
class IntervalTimer {
public:
IntervalTimer() = default;
explicit IntervalTimer(int id) { set_id(id); }
IntervalTimer(IntervalTimer&& orig) : id_(orig.release()) {}
IntervalTimer& operator=(IntervalTimer&& orig) {
if (this == &orig) return *this;
reset(orig.release());
return *this;
}
IntervalTimer(const IntervalTimer& other) = delete;
IntervalTimer& operator=(const IntervalTimer& other) = delete;
~IntervalTimer() { reset(); }
int get() const { return id_; }
int release() {
int const id = id_;
id_ = -1;
return id;
}
void reset() { reset(-1); }
void reset(int id) {
if (id_ >= 0) {
TEST_PCHECK(syscall(SYS_timer_delete, id_) == 0);
MaybeSave();
}
set_id(id);
}
PosixErrorOr<struct itimerspec> Set(
int flags, const struct itimerspec& new_value) const {
struct itimerspec old_value = {};
if (syscall(SYS_timer_settime, id_, flags, &new_value, &old_value) < 0) {
return PosixError(errno, "timer_settime");
}
MaybeSave();
return old_value;
}
PosixErrorOr<struct itimerspec> Get() const {
struct itimerspec curr_value = {};
if (syscall(SYS_timer_gettime, id_, &curr_value) < 0) {
return PosixError(errno, "timer_gettime");
}
MaybeSave();
return curr_value;
}
PosixErrorOr<int> Overruns() const {
int rv = syscall(SYS_timer_getoverrun, id_);
if (rv < 0) {
return PosixError(errno, "timer_getoverrun");
}
MaybeSave();
return rv;
}
private:
void set_id(int id) { id_ = std::max(id, -1); }
// Kernel timer_t is int; glibc timer_t is void*.
int id_ = -1;
};
// A wrapper around timer_create(2).
PosixErrorOr<IntervalTimer> TimerCreate(clockid_t clockid,
const struct sigevent& sev);
#endif // __linux__
} // namespace testing
} // namespace gvisor
#endif // GVISOR_TEST_UTIL_TIMER_UTIL_H_
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