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/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright © 2016-2023 The TokTok team.
* Copyright © 2014 Tox project.
*/
#ifndef _XOPEN_SOURCE
#define _XOPEN_SOURCE 600
#endif /* _XOPEN_SOURCE */
#if !defined(OS_WIN32) && (defined(_WIN32) || defined(__WIN32__) || defined(WIN32))
#define OS_WIN32
#endif /* WIN32 */
#include "mono_time.h"
#ifdef OS_WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif /* OS_WIN32 */
#ifdef __APPLE__
#include <mach/clock.h>
#include <mach/mach.h>
#endif /* __APPLE__ */
#ifndef OS_WIN32
#include <sys/time.h>
#endif /* OS_WIN32 */
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
#include <assert.h>
#endif /* FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */
#include <pthread.h>
#include <time.h>
#include "attributes.h"
#include "ccompat.h"
#include "mem.h"
#include "util.h"
/** don't call into system billions of times for no reason */
struct Mono_Time {
uint64_t cur_time;
uint64_t base_time;
#ifndef ESP_PLATFORM
/* protect `time` from concurrent access */
pthread_rwlock_t *time_update_lock;
#endif /* ESP_PLATFORM */
mono_time_current_time_cb *current_time_callback;
void *user_data;
};
static uint64_t timespec_to_u64(struct timespec clock_mono)
{
return UINT64_C(1000) * clock_mono.tv_sec + (clock_mono.tv_nsec / UINT64_C(1000000));
}
#ifdef OS_WIN32
non_null()
static uint64_t current_time_monotonic_default(void *user_data)
{
LARGE_INTEGER freq;
LARGE_INTEGER count;
if (!QueryPerformanceFrequency(&freq)) {
return 0;
}
if (!QueryPerformanceCounter(&count)) {
return 0;
}
struct timespec sp = {0};
sp.tv_sec = count.QuadPart / freq.QuadPart;
if (freq.QuadPart < 1000000000) {
sp.tv_nsec = (count.QuadPart % freq.QuadPart) * 1000000000 / freq.QuadPart;
} else {
sp.tv_nsec = (long)((count.QuadPart % freq.QuadPart) * (1000000000.0 / freq.QuadPart));
}
return timespec_to_u64(sp);
}
#else
#ifdef __APPLE__
non_null()
static uint64_t current_time_monotonic_default(void *user_data)
{
struct timespec clock_mono;
clock_serv_t muhclock;
mach_timespec_t machtime;
host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &muhclock);
clock_get_time(muhclock, &machtime);
mach_port_deallocate(mach_task_self(), muhclock);
clock_mono.tv_sec = machtime.tv_sec;
clock_mono.tv_nsec = machtime.tv_nsec;
return timespec_to_u64(clock_mono);
}
#else // !__APPLE__
non_null()
static uint64_t current_time_monotonic_default(void *user_data)
{
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
// This assert should always fail. If it does, the fuzzing harness didn't
// override the mono time callback.
assert(user_data == nullptr);
#endif /* FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */
struct timespec clock_mono;
clock_gettime(CLOCK_MONOTONIC, &clock_mono);
return timespec_to_u64(clock_mono);
}
#endif /* !__APPLE__ */
#endif /* !OS_WIN32 */
Mono_Time *mono_time_new(const Memory *mem, mono_time_current_time_cb *current_time_callback, void *user_data)
{
Mono_Time *mono_time = (Mono_Time *)mem_alloc(mem, sizeof(Mono_Time));
if (mono_time == nullptr) {
return nullptr;
}
#ifndef ESP_PLATFORM
pthread_rwlock_t *rwlock = (pthread_rwlock_t *)mem_alloc(mem, sizeof(pthread_rwlock_t));
if (rwlock == nullptr) {
mem_delete(mem, mono_time);
return nullptr;
}
if (pthread_rwlock_init(rwlock, nullptr) != 0) {
mem_delete(mem, rwlock);
mem_delete(mem, mono_time);
return nullptr;
}
mono_time->time_update_lock = rwlock;
#endif /* ESP_PLATFORM */
mono_time_set_current_time_callback(mono_time, current_time_callback, user_data);
mono_time->cur_time = 0;
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
// Maximum reproducibility. Never return time = 0.
mono_time->base_time = 1000000000;
#else
// Never return time = 0 in case time() returns 0 (e.g. on microcontrollers
// without battery-powered RTC or ones where NTP didn't initialise it yet).
mono_time->base_time = max_u64(1, (uint64_t)time(nullptr)) * UINT64_C(1000) - current_time_monotonic(mono_time);
#endif /* FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */
mono_time_update(mono_time);
return mono_time;
}
void mono_time_free(const Memory *mem, Mono_Time *mono_time)
{
if (mono_time == nullptr) {
return;
}
#ifndef ESP_PLATFORM
pthread_rwlock_destroy(mono_time->time_update_lock);
mem_delete(mem, mono_time->time_update_lock);
#endif /* ESP_PLATFORM */
mem_delete(mem, mono_time);
}
void mono_time_update(Mono_Time *mono_time)
{
const uint64_t cur_time =
mono_time->base_time + mono_time->current_time_callback(mono_time->user_data);
#ifndef ESP_PLATFORM
pthread_rwlock_wrlock(mono_time->time_update_lock);
#endif /* ESP_PLATFORM */
mono_time->cur_time = cur_time;
#ifndef ESP_PLATFORM
pthread_rwlock_unlock(mono_time->time_update_lock);
#endif /* ESP_PLATFORM */
}
uint64_t mono_time_get_ms(const Mono_Time *mono_time)
{
#if !defined(ESP_PLATFORM) && !defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION)
// Fuzzing is only single thread for now, no locking needed */
pthread_rwlock_rdlock(mono_time->time_update_lock);
#endif /* !ESP_PLATFORM */
const uint64_t cur_time = mono_time->cur_time;
#if !defined(ESP_PLATFORM) && !defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION)
pthread_rwlock_unlock(mono_time->time_update_lock);
#endif /* !ESP_PLATFORM */
return cur_time;
}
uint64_t mono_time_get(const Mono_Time *mono_time)
{
return mono_time_get_ms(mono_time) / UINT64_C(1000);
}
bool mono_time_is_timeout(const Mono_Time *mono_time, uint64_t timestamp, uint64_t timeout)
{
return timestamp + timeout <= mono_time_get(mono_time);
}
void mono_time_set_current_time_callback(Mono_Time *mono_time,
mono_time_current_time_cb *current_time_callback, void *user_data)
{
if (current_time_callback == nullptr) {
mono_time->current_time_callback = current_time_monotonic_default;
mono_time->user_data = mono_time;
} else {
mono_time->current_time_callback = current_time_callback;
mono_time->user_data = user_data;
}
}
/** @brief Return current monotonic time in milliseconds (ms).
*
* The starting point is unspecified and in particular is likely not comparable
* to the return value of `mono_time_get_ms()`.
*/
uint64_t current_time_monotonic(Mono_Time *mono_time)
{
return mono_time->current_time_callback(mono_time->user_data);
}
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