linux环境应用程序LOG日志打印（C语言）

下面是前段时间做项目用到的一个输出LOG日志的代码，每个文件最多记录10W行，超过10W行，将当前日志文件重命名，重新再打开。直接看代码吧，很简单！

int InitTCpRtpLog()

{



    char log[256];



    mkdir(TCP_RTP_LOG_PATH, 0755);



    snprintf(log, sizeof(log), "%s/%s", TCP_RTP_LOG_PATH, TCP_RTP_LOG_FILE);

    vTcpRtpLogHandle = fopen((char*)log, "a");

    if (vTcpRtpLogHandle){

            PrintMsgTrace("###%s(),creat log file %s sucessfull!\n",__FUNCTION__, log);



        return 0;

    }else{

        PrintMsgTrace("###$s(), Fail openning event log file (errno=%s)\n", __FUNCTION__, strerror(errno));



        return  - 1;

    }

}

static int _rebuildTcpRtpLogFiles()

{



    char tmp[256];

    char tmp2[256];

    char date[128];

    time_t now;

    struct tm ptm;

    



    if (vTcpRtpLogHandle)

    {

        fclose(vTcpRtpLogHandle);

        time(&now);

        localtime_r(&now,&ptm);

        strftime((char *)date, 128, "_%F_%T", &ptm);



        snprintf(tmp, sizeof(tmp), "%s/%s", TCP_RTP_LOG_PATH, TCP_RTP_LOG_FILE);

        snprintf(tmp2, sizeof(tmp2), "%s_%s.log", tmp,date);



        remove(tmp2);

        rename(tmp, tmp2);



        vTcpRtpLogHandle = fopen((char*)tmp, "a");

    }



    return 1;

}





void LogTcpRtp(char *p_fmt, ...)

{

    char date[256];

    time_t now;

    struct tm ptm;

    va_list ap;





    if (!vTcpRtpLogHandle){

        return;

    }



    pthread_mutex_lock(&_vTcpRtpLogMutex);



    time(&now);                   // Gets the system time



    if (localtime_r(&now, &ptm))

    {

        strftime(date, sizeof (date), "%F %T", &ptm);

        fprintf(vTcpRtpLogHandle, "[ %s ]:", date);



        va_start(ap, p_fmt);

        vfprintf(vTcpRtpLogHandle, p_fmt, ap);

        va_end(ap);



        fflush(vTcpRtpLogHandle);



        _vCurTcpRtpLogNum++;

        if (_vCurTcpRtpLogNum > MAX_RTP_TCP_NUMBER){

            _rebuildTcpRtpLogFiles();

            _vCurTcpRtpLogNum = 0;

        }

    }



    pthread_mutex_unlock(&_vTcpRtpLogMutex);

}