Ril分析四——来自网络端事件流程

从modem传递来的网络端事件，通过readLoop线程处理:

readLoop读取数据过程：

static void *readerLoop(void *arg)
{
    for (;;) {
        //从与modem通信设备端口读取数据
        line = readline();
        if (line == NULL) {
            break;
        }
        //处理数据
        processLine(line);
    }
    onReaderClosed();
    return NULL;
}

static void processLine(const char *line)
{
    if (sp_response == NULL) {
       //来自网络端事件
        handleUnsolicited(line);
    } else if (isFinalResponseSuccess(line)) {
        //客户端请求处理返回
        sp_response->success = 1;
        handleFinalResponse(line);
    } 
}

网络端事件处理过程：

static void handleUnsolicited(const char *line)
{
    //onUnsolicited
    if (s_unsolHandler != NULL) {
        s_unsolHandler(line, NULL);
    }
}

static void onUnsolicited (const char *s, const char *sms_pdu)
{
    //初始化传入的ril.cpp中RIL_onUnsolicitedResponse函数
    RIL_onUnsolicitedResponse (
            RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED,
            NULL, 0);
}


Void RIL_onUnsolicitedSendResponse(int unsolResponse, void *data,
                                size_t datalen, int client_id)
{
    unsolResponseIndex = unsolResponse - RIL_UNSOL_RESPONSE_BASE;
    appendPrintBuf("[UNSL]< %s", requestToString(unsolResponse));
    Parcel p;
    p.writeInt32 (RESPONSE_UNSOLICITED);
    p.writeInt32 (unsolResponse);
    //调用ril中网络端请求的响应函数 
    ret = s_unsolResponses[unsolResponseIndex]
                .responseFunction(p, data, datalen);

    //将数据传递给响应的设备
    ret = sendResponse(p, client_id);
    return;
}

同样以数组映射表形式存储网络端事件响应请求接口：

typedef struct {
        int requestNumber;
        int (*responseFunction) (Parcel &p, void *response, 
　　　　　　　　　　　　　　　　　　　　size_t responselen);
        WakeType wakeType;
    } UnsolResponseInfo;

static UnsolResponseInfo s_unsolResponses[] = {
　　#include "ril_unsol_commands.h"
};
ril_unsol_commands.h：
{RIL_UNSOL_RESPONSE_RADIO_STATE_CHANGED, responseVoid, WAKE_PARTIAL},
    {RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED, responseVoid, WAKE_PARTIAL},
    {RIL_UNSOL_RESPONSE_VOICE_NETWORK_STATE_CHANGED, responseVoid, WAKE_PARTIAL},
    {RIL_UNSOL_RESPONSE_NEW_SMS, responseString, WAKE_PARTIAL},
……