healthd/healthd.cpp - AOSPA/android_system_core - Gitiles

 /*
  * Copyright (C) 2013 The Android Open Source Project
  *
  * 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.
  */

 #define LOG_TAG "healthd"
 #define KLOG_LEVEL 6

 #include "BatteryMonitor.h"

 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <batteryservice/BatteryService.h>
 #include <binder/IPCThreadState.h>
 #include <binder/ProcessState.h>
 #include <cutils/klog.h>
 #include <cutils/uevent.h>
 #include <sys/epoll.h>
 #include <sys/timerfd.h>

 using namespace android;

 // Periodic chores intervals in seconds
 #define PERIODIC_CHORES_INTERVAL_FAST (60 * 1)
 #define PERIODIC_CHORES_INTERVAL_SLOW (60 * 10)

 #define POWER_SUPPLY_SUBSYSTEM "power_supply"

 // epoll events: uevent, wakealarm, binder
 #define MAX_EPOLL_EVENTS 3
 static int uevent_fd;
 static int wakealarm_fd;
 static int binder_fd;

 // -1 for no epoll timeout
 static int awake_poll_interval = -1;

 static int wakealarm_wake_interval = PERIODIC_CHORES_INTERVAL_FAST;

 static BatteryMonitor* gBatteryMonitor;

 static bool nosvcmgr;

 static void wakealarm_set_interval(int interval) {
     struct itimerspec itval;

     if (wakealarm_fd == -1)
             return;

     wakealarm_wake_interval = interval;
     itval.it_interval.tv_sec = interval;
     itval.it_interval.tv_nsec = 0;
     itval.it_value.tv_sec = interval;
     itval.it_value.tv_nsec = 0;

     if (timerfd_settime(wakealarm_fd, 0, &itval, NULL) == -1)
         KLOG_ERROR(LOG_TAG, "wakealarm_set_interval: timerfd_settime failed\n");
 }

 static void battery_update(void) {
     // Fast wake interval when on charger (watch for overheat);
     // slow wake interval when on battery (watch for drained battery).

    int new_wake_interval = gBatteryMonitor->update() ?
         PERIODIC_CHORES_INTERVAL_FAST : PERIODIC_CHORES_INTERVAL_SLOW;

     if (new_wake_interval != wakealarm_wake_interval)
             wakealarm_set_interval(new_wake_interval);

     // During awake periods poll at fast rate.  If wake alarm is set at fast
     // rate then just use the alarm; if wake alarm is set at slow rate then
     // poll at fast rate while awake and let alarm wake up at slow rate when
     // asleep.

     awake_poll_interval =
         new_wake_interval == PERIODIC_CHORES_INTERVAL_FAST ?
         -1 : PERIODIC_CHORES_INTERVAL_FAST * 1000;
 }

 static void periodic_chores() {
     battery_update();
 }

 static void uevent_init(void) {
     uevent_fd = uevent_open_socket(64*1024, true);

     if (uevent_fd >= 0)
         fcntl(uevent_fd, F_SETFL, O_NONBLOCK);
     else
         KLOG_ERROR(LOG_TAG, "uevent_init: uevent_open_socket failed\n");
 }

 #define UEVENT_MSG_LEN 1024
 static void uevent_event(void) {
     char msg[UEVENT_MSG_LEN+2];
     char *cp;
     int n;

     n = uevent_kernel_multicast_recv(uevent_fd, msg, UEVENT_MSG_LEN);
     if (n <= 0)
         return;
     if (n >= UEVENT_MSG_LEN)   /* overflow -- discard */
         return;

     msg[n] = '\0';
     msg[n+1] = '\0';
     cp = msg;

     while (*cp) {
         if (!strcmp(cp, "SUBSYSTEM=" POWER_SUPPLY_SUBSYSTEM)) {
             battery_update();
             break;
         }

         /* advance to after the next \0 */
         while (*cp++)
             ;
     }
 }

 static void wakealarm_init(void) {
     wakealarm_fd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK);
     if (wakealarm_fd == -1) {
         KLOG_ERROR(LOG_TAG, "wakealarm_init: timerfd_create failed\n");
         return;
     }

     wakealarm_set_interval(PERIODIC_CHORES_INTERVAL_FAST);
 }

 static void wakealarm_event(void) {
     unsigned long long wakeups;

     if (read(wakealarm_fd, &wakeups, sizeof(wakeups)) == -1) {
         KLOG_ERROR(LOG_TAG, "wakealarm_event: read wakealarm_fd failed\n");
         return;
     }

     periodic_chores();
 }

 static void binder_init(void) {
     ProcessState::self()->setThreadPoolMaxThreadCount(0);
     IPCThreadState::self()->disableBackgroundScheduling(true);
     IPCThreadState::self()->setupPolling(&binder_fd);
 }

 static void binder_event(void) {
     IPCThreadState::self()->handlePolledCommands();
 }

 static void healthd_mainloop(void) {
     struct epoll_event ev;
     int epollfd;
     int maxevents = 0;

     epollfd = epoll_create(MAX_EPOLL_EVENTS);
     if (epollfd == -1) {
         KLOG_ERROR(LOG_TAG,
                    "healthd_mainloop: epoll_create failed; errno=%d\n",
                    errno);
         return;
     }

     if (uevent_fd >= 0) {
         ev.events = EPOLLIN | EPOLLWAKEUP;
         ev.data.ptr = (void *)uevent_event;
         if (epoll_ctl(epollfd, EPOLL_CTL_ADD, uevent_fd, &ev) == -1)
             KLOG_ERROR(LOG_TAG,
                        "healthd_mainloop: epoll_ctl for uevent_fd failed; errno=%d\n",
                        errno);
         else
             maxevents++;
     }

     if (wakealarm_fd >= 0) {
         ev.events = EPOLLIN | EPOLLWAKEUP;
         ev.data.ptr = (void *)wakealarm_event;
         if (epoll_ctl(epollfd, EPOLL_CTL_ADD, wakealarm_fd, &ev) == -1)
             KLOG_ERROR(LOG_TAG,
                        "healthd_mainloop: epoll_ctl for wakealarm_fd failed; errno=%d\n",
                        errno);
         else
             maxevents++;
    }

     if (binder_fd >= 0) {
         ev.events = EPOLLIN | EPOLLWAKEUP;
         ev.data.ptr= (void *)binder_event;
         if (epoll_ctl(epollfd, EPOLL_CTL_ADD, binder_fd, &ev) == -1)
             KLOG_ERROR(LOG_TAG,
                        "healthd_mainloop: epoll_ctl for binder_fd failed; errno=%d\n",
                        errno);
         else
             maxevents++;
    }

     while (1) {
         struct epoll_event events[maxevents];
         int nevents;

         IPCThreadState::self()->flushCommands();
         nevents = epoll_wait(epollfd, events, maxevents, awake_poll_interval);

         if (nevents == -1) {
             if (errno == EINTR)
                 continue;
             KLOG_ERROR(LOG_TAG, "healthd_mainloop: epoll_wait failed\n");
             break;
         }

         for (int n = 0; n < nevents; ++n) {
             if (events[n].data.ptr)
                 (*(void (*)())events[n].data.ptr)();
         }
     }

     return;
 }

 int main(int argc, char **argv) {
     int ch;

     klog_set_level(KLOG_LEVEL);

     while ((ch = getopt(argc, argv, "n")) != -1) {
         switch (ch) {
         case 'n':
             nosvcmgr = true;
             break;
         case '?':
         default:
             KLOG_WARNING(LOG_TAG, "Unrecognized healthd option: %c\n", ch);
         }
     }

     wakealarm_init();
     uevent_init();
     binder_init();
     gBatteryMonitor = new BatteryMonitor();
     gBatteryMonitor->init(nosvcmgr);

     healthd_mainloop();
     return 0;
 }
	/*
	* Copyright (C) 2013 The Android Open Source Project
	*
	* 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.
	*/

	#define LOG_TAG "healthd"
	#define KLOG_LEVEL 6

	#include "BatteryMonitor.h"

	#include <errno.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <batteryservice/BatteryService.h>
	#include <binder/IPCThreadState.h>
	#include <binder/ProcessState.h>
	#include <cutils/klog.h>
	#include <cutils/uevent.h>
	#include <sys/epoll.h>
	#include <sys/timerfd.h>

	using namespace android;

	// Periodic chores intervals in seconds
	#define PERIODIC_CHORES_INTERVAL_FAST (60 * 1)
	#define PERIODIC_CHORES_INTERVAL_SLOW (60 * 10)

	#define POWER_SUPPLY_SUBSYSTEM "power_supply"

	// epoll events: uevent, wakealarm, binder
	#define MAX_EPOLL_EVENTS 3
	static int uevent_fd;
	static int wakealarm_fd;
	static int binder_fd;

	// -1 for no epoll timeout
	static int awake_poll_interval = -1;

	static int wakealarm_wake_interval = PERIODIC_CHORES_INTERVAL_FAST;

	static BatteryMonitor* gBatteryMonitor;

	static bool nosvcmgr;

	static void wakealarm_set_interval(int interval) {
	struct itimerspec itval;

	if (wakealarm_fd == -1)
	return;

	wakealarm_wake_interval = interval;
	itval.it_interval.tv_sec = interval;
	itval.it_interval.tv_nsec = 0;
	itval.it_value.tv_sec = interval;
	itval.it_value.tv_nsec = 0;

	if (timerfd_settime(wakealarm_fd, 0, &itval, NULL) == -1)
	KLOG_ERROR(LOG_TAG, "wakealarm_set_interval: timerfd_settime failed\n");
	}

	static void battery_update(void) {
	// Fast wake interval when on charger (watch for overheat);
	// slow wake interval when on battery (watch for drained battery).

	int new_wake_interval = gBatteryMonitor->update() ?
	PERIODIC_CHORES_INTERVAL_FAST : PERIODIC_CHORES_INTERVAL_SLOW;

	if (new_wake_interval != wakealarm_wake_interval)
	wakealarm_set_interval(new_wake_interval);

	// During awake periods poll at fast rate. If wake alarm is set at fast
	// rate then just use the alarm; if wake alarm is set at slow rate then
	// poll at fast rate while awake and let alarm wake up at slow rate when
	// asleep.

	awake_poll_interval =
	new_wake_interval == PERIODIC_CHORES_INTERVAL_FAST ?
	-1 : PERIODIC_CHORES_INTERVAL_FAST * 1000;
	}

	static void periodic_chores() {
	battery_update();
	}

	static void uevent_init(void) {
	uevent_fd = uevent_open_socket(64*1024, true);

	if (uevent_fd >= 0)
	fcntl(uevent_fd, F_SETFL, O_NONBLOCK);
	else
	KLOG_ERROR(LOG_TAG, "uevent_init: uevent_open_socket failed\n");
	}

	#define UEVENT_MSG_LEN 1024
	static void uevent_event(void) {
	char msg[UEVENT_MSG_LEN+2];
	char *cp;
	int n;

	n = uevent_kernel_multicast_recv(uevent_fd, msg, UEVENT_MSG_LEN);
	if (n <= 0)
	return;
	if (n >= UEVENT_MSG_LEN) /* overflow -- discard */
	return;

	msg[n] = '\0';
	msg[n+1] = '\0';
	cp = msg;

	while (*cp) {
	if (!strcmp(cp, "SUBSYSTEM=" POWER_SUPPLY_SUBSYSTEM)) {
	battery_update();
	break;
	}

	/* advance to after the next \0 */
	while (*cp++)
	;
	}
	}

	static void wakealarm_init(void) {
	wakealarm_fd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK);
	if (wakealarm_fd == -1) {
	KLOG_ERROR(LOG_TAG, "wakealarm_init: timerfd_create failed\n");
	return;
	}

	wakealarm_set_interval(PERIODIC_CHORES_INTERVAL_FAST);
	}

	static void wakealarm_event(void) {
	unsigned long long wakeups;

	if (read(wakealarm_fd, &wakeups, sizeof(wakeups)) == -1) {
	KLOG_ERROR(LOG_TAG, "wakealarm_event: read wakealarm_fd failed\n");
	return;
	}

	periodic_chores();
	}

	static void binder_init(void) {
	ProcessState::self()->setThreadPoolMaxThreadCount(0);
	IPCThreadState::self()->disableBackgroundScheduling(true);
	IPCThreadState::self()->setupPolling(&binder_fd);
	}

	static void binder_event(void) {
	IPCThreadState::self()->handlePolledCommands();
	}

	static void healthd_mainloop(void) {
	struct epoll_event ev;
	int epollfd;
	int maxevents = 0;

	epollfd = epoll_create(MAX_EPOLL_EVENTS);
	if (epollfd == -1) {
	KLOG_ERROR(LOG_TAG,
	"healthd_mainloop: epoll_create failed; errno=%d\n",
	errno);
	return;
	}

	if (uevent_fd >= 0) {
	ev.events = EPOLLIN \| EPOLLWAKEUP;
	ev.data.ptr = (void *)uevent_event;
	if (epoll_ctl(epollfd, EPOLL_CTL_ADD, uevent_fd, &ev) == -1)
	KLOG_ERROR(LOG_TAG,
	"healthd_mainloop: epoll_ctl for uevent_fd failed; errno=%d\n",
	errno);
	else
	maxevents++;
	}

	if (wakealarm_fd >= 0) {
	ev.events = EPOLLIN \| EPOLLWAKEUP;
	ev.data.ptr = (void *)wakealarm_event;
	if (epoll_ctl(epollfd, EPOLL_CTL_ADD, wakealarm_fd, &ev) == -1)
	KLOG_ERROR(LOG_TAG,
	"healthd_mainloop: epoll_ctl for wakealarm_fd failed; errno=%d\n",
	errno);
	else
	maxevents++;
	}

	if (binder_fd >= 0) {
	ev.events = EPOLLIN \| EPOLLWAKEUP;
	ev.data.ptr= (void *)binder_event;
	if (epoll_ctl(epollfd, EPOLL_CTL_ADD, binder_fd, &ev) == -1)
	KLOG_ERROR(LOG_TAG,
	"healthd_mainloop: epoll_ctl for binder_fd failed; errno=%d\n",
	errno);
	else
	maxevents++;
	}

	while (1) {
	struct epoll_event events[maxevents];
	int nevents;

	IPCThreadState::self()->flushCommands();
	nevents = epoll_wait(epollfd, events, maxevents, awake_poll_interval);

	if (nevents == -1) {
	if (errno == EINTR)
	continue;
	KLOG_ERROR(LOG_TAG, "healthd_mainloop: epoll_wait failed\n");
	break;
	}

	for (int n = 0; n < nevents; ++n) {
	if (events[n].data.ptr)
	((void ()())events[n].data.ptr)();
	}
	}

	return;
	}

	int main(int argc, char **argv) {
	int ch;

	klog_set_level(KLOG_LEVEL);

	while ((ch = getopt(argc, argv, "n")) != -1) {
	switch (ch) {
	case 'n':
	nosvcmgr = true;
	break;
	case '?':
	default:
	KLOG_WARNING(LOG_TAG, "Unrecognized healthd option: %c\n", ch);
	}
	}

	wakealarm_init();
	uevent_init();
	binder_init();
	gBatteryMonitor = new BatteryMonitor();
	gBatteryMonitor->init(nosvcmgr);

	healthd_mainloop();
	return 0;
	}