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-rw-r--r--test/util/timer_util.h164
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diff --git a/test/util/timer_util.h b/test/util/timer_util.h
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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 {
-
-// 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_