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/*
* Copyright (C) 2014 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 "BatteryStatsService"
//#define LOG_NDEBUG 0
#include <android_runtime/AndroidRuntime.h>
#include <jni.h>
#include <ScopedLocalRef.h>
#include <ScopedPrimitiveArray.h>
#include <cutils/log.h>
#include <utils/misc.h>
#include <utils/Log.h>
#include <hardware/hardware.h>
#include <suspend/autosuspend.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <semaphore.h>
#include <stddef.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
namespace android
{
#define LAST_RESUME_REASON "/sys/kernel/wakeup_reasons/last_resume_reason"
#define MAX_REASON_SIZE 512
static bool wakeup_init = false;
static sem_t wakeup_sem;
static void wakeup_callback(bool success)
{
ALOGV("In wakeup_callback: %s", success ? "resumed from suspend" : "suspend aborted");
int ret = sem_post(&wakeup_sem);
if (ret < 0) {
char buf[80];
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error posting wakeup sem: %s\n", buf);
}
}
static jint nativeWaitWakeup(JNIEnv *env, jobject clazz, jobject outBuf)
{
if (outBuf == NULL) {
jniThrowException(env, "java/lang/NullPointerException", "null argument");
return -1;
}
// Register our wakeup callback if not yet done.
if (!wakeup_init) {
wakeup_init = true;
ALOGV("Creating semaphore...");
int ret = sem_init(&wakeup_sem, 0, 0);
if (ret < 0) {
char buf[80];
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error creating semaphore: %s\n", buf);
jniThrowException(env, "java/lang/IllegalStateException", buf);
return -1;
}
ALOGV("Registering callback...");
set_wakeup_callback(&wakeup_callback);
}
// Wait for wakeup.
ALOGV("Waiting for wakeup...");
int ret = sem_wait(&wakeup_sem);
if (ret < 0) {
char buf[80];
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error waiting on semaphore: %s\n", buf);
// Return 0 here to let it continue looping but not return results.
return 0;
}
FILE *fp = fopen(LAST_RESUME_REASON, "r");
if (fp == NULL) {
ALOGE("Failed to open %s", LAST_RESUME_REASON);
return -1;
}
char* mergedreason = (char*)env->GetDirectBufferAddress(outBuf);
int remainreasonlen = (int)env->GetDirectBufferCapacity(outBuf);
ALOGV("Reading wakeup reasons");
char* mergedreasonpos = mergedreason;
char reasonline[128];
int i = 0;
while (fgets(reasonline, sizeof(reasonline), fp) != NULL) {
char* pos = reasonline;
char* endPos;
int len;
// First field is the index or 'Abort'.
int irq = (int)strtol(pos, &endPos, 10);
if (pos != endPos) {
// Write the irq number to the merged reason string.
len = snprintf(mergedreasonpos, remainreasonlen, i == 0 ? "%d" : ":%d", irq);
} else {
// The first field is not an irq, it may be the word Abort.
const size_t abortPrefixLen = strlen("Abort:");
if (strncmp(pos, "Abort:", abortPrefixLen) != 0) {
// Ooops.
ALOGE("Bad reason line: %s", reasonline);
continue;
}
// Write 'Abort' to the merged reason string.
len = snprintf(mergedreasonpos, remainreasonlen, i == 0 ? "Abort" : ":Abort");
endPos = pos + abortPrefixLen;
}
pos = endPos;
if (len >= 0 && len < remainreasonlen) {
mergedreasonpos += len;
remainreasonlen -= len;
}
// Skip whitespace; rest of the buffer is the reason string.
while (*pos == ' ') {
pos++;
}
// Chop newline at end.
char* endpos = pos;
while (*endpos != 0) {
if (*endpos == '\n') {
*endpos = 0;
break;
}
endpos++;
}
len = snprintf(mergedreasonpos, remainreasonlen, ":%s", pos);
if (len >= 0 && len < remainreasonlen) {
mergedreasonpos += len;
remainreasonlen -= len;
}
i++;
}
ALOGV("Got %d reasons", i);
if (i > 0) {
*mergedreasonpos = 0;
}
if (fclose(fp) != 0) {
ALOGE("Failed to close %s", LAST_RESUME_REASON);
return -1;
}
return mergedreasonpos - mergedreason;
}
static JNINativeMethod method_table[] = {
{ "nativeWaitWakeup", "(Ljava/nio/ByteBuffer;)I", (void*)nativeWaitWakeup },
};
int register_android_server_BatteryStatsService(JNIEnv *env)
{
return jniRegisterNativeMethods(env, "com/android/server/am/BatteryStatsService",
method_table, NELEM(method_table));
}
};
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