??? Android源碼目錄hardware/ril/libril中總共包含5個C/CPP文件，它們分別是ril_commands.h、ril_unsol_commands.h、ril_event.h、ril_event.cpp和ril.cpp。這篇文章主要分析ril.cpp文件。

??? 我們可以將該文件劃分為定義部分和實現部分，先來看定義部分：

#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 // 常見的獲取數組元素個數的方法 #define NUM_ELEMS(a) (sizeof (a) / sizeof (a)[0]) // 返回兩數中較小者 #define MIN(a,b) ((a)<(b) ? (a) : (b)) /* 回復類型：經過請求的回復和未經請求的回復*/ #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 // 即打印緩沖區printBuf的大小 #define PRINTBUF_SIZE 8096 // Enable RILC log #define RILC_LOG 0 #if RILC_LOG // 三個宏的調用順序是startRequest - printRequest - closeRequest // 這樣打印出來的請求命令將包含在（）中 #define startRequest sprintf(printBuf, "(") #define closeRequest sprintf(printBuf, "%s)", printBuf) #define printRequest(token, req) \ LOGD("[%04d]> %s %s", token, requestToString(req), printBuf) // 三個宏的調用順序是startResponse - printResponse - closeResponse // 這樣打印出來的回復信息將包含在｛｝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 // 喚醒類型：不喚醒，部分喚醒 enum WakeType {DONT_WAKE, WAKE_PARTIAL}; // "經過請求的回復"結構體定義：請求號，命令分發處理函數，返回結果響應函數 // 該結構體的取值見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; //"未經請求的回復"結構體定義：請求號，事件響應函數，喚醒類型 // 該結構體的取值見ril_unsol_commands.h文件 typedef struct { int requestNumber; int (*responseFunction) (Parcel &p, void *response, size_t responselen); WakeType wakeType; } UnsolResponseInfo; // 請求信息結構體，封裝CommandInfo，串成鏈表 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; // 用戶回調信息結構體 typedef struct UserCallbackInfo { RIL_TimedCallback p_callback; // 回調函數 void *userParam; // 回調函數的參數 struct ril_event event; // ril event struct UserCallbackInfo *p_next; // 指向下一個回調信息結構（鏈表形式） } UserCallbackInfo; /*******************************************************************/ // 初始化回調結構 RIL_RadioFunctions s_callbacks = {0, NULL, NULL, NULL, NULL, NULL}; static int s_registerCalled = 0; static pthread_t s_tid_dispatch; // 分發處理線程ID static pthread_t s_tid_reader; // 讀者線程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個相關的事件 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}; // 初始化互斥量和條件變量 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]; // 緩存打印信息的數組 #endif /*******************************************************************/ // dispatch*系列函數是基帶處理器對應用處理器請求的處理函數 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*系列函數是應用處理器對基帶處理器消息的響應函數 // 包括請求回復響應函數和事件響應函數 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); // 將數據結構信息轉換成字符串輸出 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 */ // 很不錯的一個用法，由于數組元素太多，為了代碼的整潔清晰， // 將數組元素的定義放在一個單獨的頭文件中，并用#include進來即可 static CommandInfo s_commands[] = { #include "ril_commands.h" }; static UnsolResponseInfo s_unsolResponses[] = { #include "ril_unsol_commands.h" };

To Be Continued

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