1 /*
2 * Copyright (C) 2021 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include <unistd.h>
17 #include <cstring>
18 #include <sys/epoll.h>
19 #include <sys/timerfd.h>
20 #include <sys/time.h>
21 #include <sstream>
22 #include <fstream>
23 #include <iostream>
24 #include "timer_handler.h"
25
26 namespace OHOS {
27 namespace MiscServices {
28 namespace {
29 static const uint32_t ALARM_TIME_CHANGE_MASK = 1 << 16;
30 static const clockid_t alarm_to_clock_id[N_TIMER_FDS] = {
31 CLOCK_REALTIME_ALARM,
32 CLOCK_REALTIME,
33 CLOCK_BOOTTIME_ALARM,
34 CLOCK_BOOTTIME,
35 CLOCK_MONOTONIC,
36 CLOCK_REALTIME,
37 };
38 }
39
Create()40 std::shared_ptr<TimerHandler> TimerHandler::Create()
41 {
42 int epollfd;
43 TimerFds fds;
44
45 epollfd = epoll_create(fds.size());
46 if (epollfd < 0) {
47 TIME_HILOGE(TIME_MODULE_SERVICE, "epoll_create %{public}d failed: %{public}s",
48 static_cast<int>(fds.size()), strerror(errno));
49 return nullptr;
50 }
51
52 std::string fdStr = "";
53 std::string typStr = "";
54 for (size_t i = 0; i < fds.size(); i++) {
55 fds[i] = timerfd_create(alarm_to_clock_id[i], 0);
56 if (fds[i] < 0) {
57 TIME_HILOGE(TIME_MODULE_SERVICE, "timerfd_create %{public}d failed: %{public}s",
58 static_cast<int>(i), strerror(errno));
59 close(epollfd);
60 for (size_t j = 0; j < i; j++) {
61 close(fds[j]);
62 }
63 return nullptr;
64 }
65 fdStr += std::to_string(fds[i]) + " ";
66 typStr += std::to_string(i) + " ";
67 }
68 TIME_HILOGW(TIME_MODULE_SERVICE, "create fd:[%{public}s], typ:[%{public}s]", fdStr.c_str(), typStr.c_str());
69
70 std::shared_ptr<TimerHandler> handler = std::shared_ptr<TimerHandler>(new TimerHandler(fds, epollfd));
71 for (size_t i = 0; i < fds.size(); i++) {
72 epoll_event event {};
73 event.events = EPOLLIN | EPOLLWAKEUP;
74 event.data.u32 = i;
75
76 int err = epoll_ctl(epollfd, EPOLL_CTL_ADD, fds[i], &event);
77 if (err < 0) {
78 TIME_HILOGE(TIME_MODULE_SERVICE, "epoll_ctl(EPOLL_CTL_ADD) failed: %{public}s", strerror(errno));
79 return nullptr;
80 }
81 }
82 itimerspec spec {};
83
84 int err = timerfd_settime(fds[ALARM_TYPE_COUNT], TFD_TIMER_ABSTIME | TFD_TIMER_CANCEL_ON_SET, &spec, nullptr);
85 TIME_HILOGW(TIME_MODULE_SERVICE, "settime fd: %{public}d, res: %{public}d, errno: %{public}s",
86 fds[ALARM_TYPE_COUNT], err, strerror(errno));
87 if (err < 0 && errno != ECANCELED) {
88 return nullptr;
89 }
90
91 return handler;
92 }
93
TimerHandler(const TimerFds & fds,int epollfd)94 TimerHandler::TimerHandler(const TimerFds &fds, int epollfd)
95 : fds_ {fds}, epollFd_ {epollfd}
96 {
97 }
98
~TimerHandler()99 TimerHandler::~TimerHandler()
100 {
101 for (auto fd : fds_) {
102 epoll_ctl(epollFd_, EPOLL_CTL_DEL, fd, nullptr);
103 close(fd);
104 }
105 close(epollFd_);
106 }
107
Set(uint32_t type,std::chrono::nanoseconds when,std::chrono::steady_clock::time_point bootTime)108 int TimerHandler::Set(uint32_t type, std::chrono::nanoseconds when, std::chrono::steady_clock::time_point bootTime)
109 {
110 if (static_cast<size_t>(type) > ALARM_TYPE_COUNT) {
111 errno = EINVAL;
112 return -1;
113 }
114
115 auto second = std::chrono::duration_cast<std::chrono::seconds>(when);
116 TIME_SIMPLIFY_HILOGI(TIME_MODULE_SERVICE, "typ:%{public}d trig: %{public}lld %{public}lld, bt: %{public}lld",
117 type, second.count(), (when - second).count(), bootTime.time_since_epoch().count());
118 timespec ts {second.count(), (when - second).count()};
119 itimerspec spec {timespec {}, ts};
120 int ret = timerfd_settime(fds_[type], TFD_TIMER_ABSTIME, &spec, nullptr);
121 if (ret != 0) {
122 TIME_HILOGE(TIME_MODULE_SERVICE, "Set timer to kernel. ret: %{public}d. error: %{public}s.",
123 ret, strerror(errno));
124 }
125 return ret;
126 }
127
WaitForAlarm()128 uint32_t TimerHandler::WaitForAlarm()
129 {
130 epoll_event events[N_TIMER_FDS];
131
132 int nevents = 0;
133 do {
134 nevents = epoll_wait(epollFd_, events, N_TIMER_FDS, -1);
135 } while (nevents < 0 && errno == EINTR);
136
137 uint32_t result = 0;
138 for (int i = 0; i < nevents; i++) {
139 uint32_t alarm_idx = events[i].data.u32;
140 uint64_t unused;
141 ssize_t err = read(fds_[alarm_idx], &unused, sizeof(unused));
142 if (err < 0) {
143 if (alarm_idx == ALARM_TYPE_COUNT && errno == ECANCELED) {
144 result |= ALARM_TIME_CHANGE_MASK;
145 } else {
146 return err;
147 }
148 } else {
149 result |= (1 << alarm_idx);
150 }
151 }
152 return result;
153 }
154 } // MiscServices
155 } // OHOS