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1 /* //device/libs/android_runtime/android_server_AlarmManagerService.cpp
2 **
3 ** Copyright 2006, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 **     http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17 
18 #define LOG_TAG "AlarmManagerService"
19 
20 #include "JNIHelp.h"
21 #include "jni.h"
22 #include <utils/Log.h>
23 #include <utils/misc.h>
24 
25 #include <fcntl.h>
26 #include <stdio.h>
27 #include <string.h>
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <arpa/inet.h>
31 #include <netinet/in.h>
32 #include <stdlib.h>
33 #include <errno.h>
34 #include <unistd.h>
35 
36 #if HAVE_ANDROID_OS
37 #include <linux/ioctl.h>
38 #include <linux/android_alarm.h>
39 #endif
40 
41 #define ONE_NANOSECOND 1000000000LL
42 #define NANOSECONDS_TO_SECONDS(x) (x / ONE_NANOSECOND)
43 #define SECONDS_TO_NANOSECONDS(x) (x * ONE_NANOSECOND)
44 
45 namespace android {
46 
android_server_AlarmManagerService_setKernelTimezone(JNIEnv * env,jobject obj,jint fd,jint minswest)47 static jint android_server_AlarmManagerService_setKernelTimezone(JNIEnv* env, jobject obj, jint fd, jint minswest)
48 {
49 #if HAVE_ANDROID_OS
50     struct timezone tz;
51 
52     tz.tz_minuteswest = minswest;
53     tz.tz_dsttime = 0;
54 
55     int result = settimeofday(NULL, &tz);
56     if (result < 0) {
57         LOGE("Unable to set kernel timezone to %d: %s\n", minswest, strerror(errno));
58         return -1;
59     } else {
60         LOGD("Kernel timezone updated to %d minutes west of GMT\n", minswest);
61     }
62 
63     return 0;
64 #else
65     return -ENOSYS;
66 #endif
67 }
68 
android_server_AlarmManagerService_init(JNIEnv * env,jobject obj)69 static jint android_server_AlarmManagerService_init(JNIEnv* env, jobject obj)
70 {
71 #if HAVE_ANDROID_OS
72     return open("/dev/alarm", O_RDWR);
73 #else
74 	return -1;
75 #endif
76 }
77 
android_server_AlarmManagerService_close(JNIEnv * env,jobject obj,jint fd)78 static void android_server_AlarmManagerService_close(JNIEnv* env, jobject obj, jint fd)
79 {
80 #if HAVE_ANDROID_OS
81 	close(fd);
82 #endif
83 }
84 
android_server_AlarmManagerService_set(JNIEnv * env,jobject obj,jint fd,jint type,jlong nanoseconds)85 static void android_server_AlarmManagerService_set(JNIEnv* env, jobject obj, jint fd, jint type, jlong nanoseconds)
86 {
87 #if HAVE_ANDROID_OS
88     struct timespec ts;
89     ts.tv_sec = NANOSECONDS_TO_SECONDS(nanoseconds);
90     ts.tv_nsec = nanoseconds - SECONDS_TO_NANOSECONDS(ts.tv_sec);
91 
92 	int result = ioctl(fd, ANDROID_ALARM_SET(type), &ts);
93 	if (result < 0)
94 	{
95         LOGE("Unable to set alarm to %lld: %s\n", nanoseconds, strerror(errno));
96     }
97 #endif
98 }
99 
android_server_AlarmManagerService_waitForAlarm(JNIEnv * env,jobject obj,jint fd)100 static jint android_server_AlarmManagerService_waitForAlarm(JNIEnv* env, jobject obj, jint fd)
101 {
102 #if HAVE_ANDROID_OS
103 	int result = 0;
104 
105 	do
106 	{
107 		result = ioctl(fd, ANDROID_ALARM_WAIT);
108 	} while (result < 0 && errno == EINTR);
109 
110 	if (result < 0)
111 	{
112         LOGE("Unable to wait on alarm: %s\n", strerror(errno));
113         return 0;
114     }
115 
116     return result;
117 #endif
118 }
119 
120 static JNINativeMethod sMethods[] = {
121      /* name, signature, funcPtr */
122 	{"init", "()I", (void*)android_server_AlarmManagerService_init},
123 	{"close", "(I)V", (void*)android_server_AlarmManagerService_close},
124 	{"set", "(IIJ)V", (void*)android_server_AlarmManagerService_set},
125     {"waitForAlarm", "(I)I", (void*)android_server_AlarmManagerService_waitForAlarm},
126     {"setKernelTimezone", "(II)I", (void*)android_server_AlarmManagerService_setKernelTimezone},
127 };
128 
register_android_server_AlarmManagerService(JNIEnv * env)129 int register_android_server_AlarmManagerService(JNIEnv* env)
130 {
131     jclass clazz = env->FindClass("com/android/server/AlarmManagerService");
132 
133     if (clazz == NULL)
134 	{
135         LOGE("Can't find com/android/server/AlarmManagerService");
136         return -1;
137     }
138 
139     return jniRegisterNativeMethods(env, "com/android/server/AlarmManagerService",
140                                     sMethods, NELEM(sMethods));
141 }
142 
143 } /* namespace android */
144