Android RIL源码研究笔记 の ril (一)
Android RIL源码研究笔记 の ril (一)
Android源码目录hardware/ril/libril中总共包含5个C/CPP文件,它们分别是ril_commands.h、ril_unsol_commands.h、ril_event.h、ril_event.cpp和ril.cpp。这篇文章主要分析ril.cpp文件。我们可以将该文件划分为定义部分和实现部分,先来看定义部分:
- #define LOG_TAG "RILC"
- #include <hardware_legacy/power.h>
- #include <telephony/ril.h>
- #include <telephony/ril_cdma_sms.h>
- #include <cutils/sockets.h>
- #include <cutils/jstring.h>
- #include <cutils/record_stream.h>
- #include <utils/Log.h>
- #include <utils/SystemClock.h>
- #include <pthread.h>
- #include <binder/Parcel.h>
- #include <cutils/jstring.h>
- #include <sys/types.h>
- #include <pwd.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <stdarg.h>
- #include <string.h>
- #include <unistd.h>
- #include <fcntl.h>
- #include <time.h>
- #include <errno.h>
- #include <assert.h>
- #include <ctype.h>
- #include <alloca.h>
- #include <sys/un.h>
- #include <assert.h>
- #include <netinet/in.h>
- #include <cutils/properties.h>
- #include <ril_event.h>
- namespace android {
- #define PHONE_PROCESS "radio"
- #define SOCKET_NAME_RIL "rild"
- #define SOCKET_NAME_RIL_DEBUG "rild-debug"
- #define ANDROID_WAKE_LOCK_NAME "radio-interface"
- #define PROPERTY_RIL_IMPL "gsm.version.ril-impl"
- // match with constant in RIL.java
- #define MAX_COMMAND_BYTES (8 * 1024)
- // Basically: memset buffers that the client library
- // shouldn't be using anymore in an attempt to find
- // memory usage issues sooner.
- #define MEMSET_FREED 1
- // 常见的获取数组元素个数的方法
- #define NUM_ELEMS(a) (sizeof (a) / sizeof (a)[0])
- // 返回两数中较小者
- #define MIN(a,b) ((a)<(b) ? (a) : (b))
- /* 回复类型:经过请求的回复和未经请求的回复*/
- #define RESPONSE_SOLICITED 0
- #define RESPONSE_UNSOLICITED 1
- /* Negative values for private RIL errno's */
- #define RIL_ERRNO_INVALID_RESPONSE -1
- // request, response, and unsolicited msg print macro
- // 即打印缓冲区printBuf的大小
- #define PRINTBUF_SIZE 8096
- // Enable RILC log
- #define RILC_LOG 0
- #if RILC_LOG
- // 三个宏的调用顺序是startRequest - printRequest - closeRequest
- // 这样打印出来的请求命令将包含在()中
- #define startRequest sprintf(printBuf, "(")
- #define closeRequest sprintf(printBuf, "%s)", printBuf)
- #define printRequest(token, req) \
- LOGD("[%04d]> %s %s", token, requestToString(req), printBuf)
- // 三个宏的调用顺序是startResponse - printResponse - closeResponse
- // 这样打印出来的回复信息将包含在{}中
- #define startResponse sprintf(printBuf, "%s {", printBuf)
- #define closeResponse sprintf(printBuf, "%s}", printBuf)
- #define printResponse LOGD("%s", printBuf)
- #define clearPrintBuf printBuf[0] = 0
- #define removeLastChar printBuf[strlen(printBuf)-1] = 0
- #define appendPrintBuf(x...) sprintf(printBuf, x)
- #else
- #define startRequest
- #define closeRequest
- #define printRequest(token, req)
- #define startResponse
- #define closeResponse
- #define printResponse
- #define clearPrintBuf
- #define removeLastChar
- #define appendPrintBuf(x...)
- #endif
- // 唤醒类型:不唤醒,部分唤醒
- enum WakeType {DONT_WAKE, WAKE_PARTIAL};
- // "经过请求的回复"结构体定义:请求号,命令分发处理函数,返回结果响应函数
- // 该结构体的取值见ril_commands.h文件
- typedef struct {
- int requestNumber;
- void (*dispatchFunction) (Parcel &p, struct RequestInfo *pRI);
- int(*responseFunction) (Parcel &p, void *response, size_t responselen);
- } CommandInfo;
- //"未经请求的回复"结构体定义:请求号,事件响应函数,唤醒类型
- // 该结构体的取值见ril_unsol_commands.h文件
- typedef struct {
- int requestNumber;
- int (*responseFunction) (Parcel &p, void *response, size_t responselen);
- WakeType wakeType;
- } UnsolResponseInfo;
- // 请求信息结构体,封装CommandInfo,串成链表
- typedef struct RequestInfo {
- int32_t token; //this is not RIL_Token
- CommandInfo *pCI;
- struct RequestInfo *p_next;
- char cancelled;
- char local; // responses to local commands do not go back to command process
- } RequestInfo;
- // 用户回调信息结构体
- typedef struct UserCallbackInfo {
- RIL_TimedCallback p_callback; // 回调函数
- void *userParam; // 回调函数的参数
- struct ril_event event; // ril event
- struct UserCallbackInfo *p_next; // 指向下一个回调信息结构(链表形式)
- } UserCallbackInfo;
- /*******************************************************************/
- // 初始化回调结构
- RIL_RadioFunctions s_callbacks = {0, NULL, NULL, NULL, NULL, NULL};
- static int s_registerCalled = 0;
- static pthread_t s_tid_dispatch; // 分发处理线程ID
- static pthread_t s_tid_reader; // 读者线程ID
- static int s_started = 0;
- // 文件描述符初始化
- static int s_fdListen = -1;
- static int s_fdCommand = -1;
- static int s_fdDebug = -1;
- static int s_fdWakeupRead;
- static int s_fdWakeupWrite;
- // 5个相关的事件
- static struct ril_event s_commands_event;
- static struct ril_event s_wakeupfd_event;
- static struct ril_event s_listen_event;
- static struct ril_event s_wake_timeout_event;
- static struct ril_event s_debug_event;
- static const struct timeval TIMEVAL_WAKE_TIMEOUT = {1,0};
- // 初始化互斥量和条件变量
- static pthread_mutex_t s_pendingRequestsMutex = PTHREAD_MUTEX_INITIALIZER;
- static pthread_mutex_t s_writeMutex = PTHREAD_MUTEX_INITIALIZER;
- static pthread_mutex_t s_startupMutex = PTHREAD_MUTEX_INITIALIZER;
- static pthread_cond_t s_startupCond = PTHREAD_COND_INITIALIZER;
- static pthread_mutex_t s_dispatchMutex = PTHREAD_MUTEX_INITIALIZER;
- static pthread_cond_t s_dispatchCond = PTHREAD_COND_INITIALIZER;
- static RequestInfo *s_pendingRequests = NULL;
- static RequestInfo *s_toDispatchHead = NULL;
- static RequestInfo *s_toDispatchTail = NULL;
- static UserCallbackInfo *s_last_wake_timeout_info = NULL;
- static void *s_lastNITZTimeData = NULL;
- static size_t s_lastNITZTimeDataSize;
- #if RILC_LOG
- static char printBuf[PRINTBUF_SIZE]; // 缓存打印信息的数组
- #endif
- /*******************************************************************/
- // dispatch*系列函数是基带处理器对应用处理器请求的处理函数
- static void dispatchVoid (Parcel& p, RequestInfo *pRI);
- static void dispatchString (Parcel& p, RequestInfo *pRI);
- static void dispatchStrings (Parcel& p, RequestInfo *pRI);
- static void dispatchInts (Parcel& p, RequestInfo *pRI);
- static void dispatchDial (Parcel& p, RequestInfo *pRI);
- static void dispatchSIM_IO (Parcel& p, RequestInfo *pRI);
- static void dispatchCallForward(Parcel& p, RequestInfo *pRI);
- static void dispatchRaw(Parcel& p, RequestInfo *pRI);
- static void dispatchSmsWrite (Parcel &p, RequestInfo *pRI);
- static void dispatchCdmaSms(Parcel &p, RequestInfo *pRI);
- static void dispatchCdmaSmsAck(Parcel &p, RequestInfo *pRI);
- static void dispatchGsmBrSmsCnf(Parcel &p, RequestInfo *pRI);
- static void dispatchCdmaBrSmsCnf(Parcel &p, RequestInfo *pRI);
- static void dispatchRilCdmaSmsWriteArgs(Parcel &p, RequestInfo *pRI);
- // response*系列函数是应用处理器对基带处理器消息的响应函数
- // 包括请求回复响应函数和事件响应函数
- static int responseInts(Parcel &p, void *response, size_t responselen);
- static int responseStrings(Parcel &p, void *response, size_t responselen);
- static int responseString(Parcel &p, void *response, size_t responselen);
- static int responseVoid(Parcel &p, void *response, size_t responselen);
- static int responseCallList(Parcel &p, void *response, size_t responselen);
- static int responseSMS(Parcel &p, void *response, size_t responselen);
- static int responseSIM_IO(Parcel &p, void *response, size_t responselen);
- static int responseCallForwards(Parcel &p, void *response, size_t responselen);
- static int responseDataCallList(Parcel &p, void *response, size_t responselen);
- static int responseRaw(Parcel &p, void *response, size_t responselen);
- static int responseSsn(Parcel &p, void *response, size_t responselen);
- static int responseSimStatus(Parcel &p, void *response, size_t responselen);
- static int responseGsmBrSmsCnf(Parcel &p, void *response, size_t responselen);
- static int responseCdmaBrSmsCnf(Parcel &p, void *response, size_t responselen);
- static int responseCdmaSms(Parcel &p, void *response, size_t responselen);
- static int responseCellList(Parcel &p, void *response, size_t responselen);
- static int responseCdmaInformationRecords(Parcel &p,void *response, size_t responselen);
- static int responseRilSignalStrength(Parcel &p,void *response, size_t responselen);
- static int responseCallRing(Parcel &p, void *response, size_t responselen);
- static int responseCdmaSignalInfoRecord(Parcel &p,void *response, size_t responselen);
- static int responseCdmaCallWaiting(Parcel &p,void *response, size_t responselen);
- // 将数据结构信息转换成字符串输出
- extern "C" const char * requestToString(int request);
- extern "C" const char * failCauseToString(RIL_Errno);
- extern "C" const char * callStateToString(RIL_CallState);
- extern "C" const char * radioStateToString(RIL_RadioState);
- #ifdef RIL_SHLIB
- extern "C" void RIL_onUnsolicitedResponse(int unsolResponse, void *data,
- size_t datalen);
- #endif
- static UserCallbackInfo * internalRequestTimedCallback
- (RIL_TimedCallback callback, void *param,
- const struct timeval *relativeTime);
- /** Index == requestNumber */
- // 很不错的一个用法,由于数组元素太多,为了代码的整洁清晰,
- // 将数组元素的定义放在一个单独的头文件中,并用#include进来即可
- static CommandInfo s_commands[] = {
- #include "ril_commands.h"
- };
- static UnsolResponseInfo s_unsolResponses[] = {
- #include "ril_unsol_commands.h"
- };
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