住宅樓宇按揭

住宅樓宇按揭

楼价$518万，首期20%即$103.6万

13 Mar 2017 付了现金$5万
28 Mar 2017 向律师楼交了支票$46.8万，以及$15.54万印花税支票
3 Apr 2017 是3星期后的首期付款日子，首期10%已经扣数
12 May 2017 成交日前要付楼价90%即$466.2万

楼价$518万，贷款80%即$414.4万，按揭保费$89096(2.15%)

按揭保费如何计算？
以按揭30年浮息按揭，一次付清保险费的保费为2.15%，每年支付的话是首年1.11%，其后0.28%。

Citibank提供的按揭内容：

户口是Citibanking而不是Citi Priority及Citigold，并且开立雇员理财计划(Citi At Work)，包括货币理财组合(Currency Manager)，以及港元「月月增息」支票储蓄户口(HKD Step-Up Interest Account / HKUA)。

Python traceback

import traceback

def ToTraceLines(ex, ex_traceback=None):

    if ex_traceback is None:

        ex_traceback = ex.__traceback__

    return [ line.rstrip('\n') for line in traceback.format_exception(ex.__class__, ex, ex_traceback)]

   

try:

    x = get_number()

except Exception as ex:

    ToTraceLines(ex)

dlopen and dlsym

Prepare a SO file writtern in C:
vi libso.c
#include <stdio.h>
int bejo_lib(char *name, int i) {
    printf("I am %s, do i=%d\n", name, i);
    return 0;
}
gcc -fPIC -c libso.c
gcc -shared -o libso.so libso.o

Notice the function name is not mangled because it is not C++:
nm libso.so  | grep bejo
00000000000006c8 T bejo_lib

Prepare the C user code:
vi use.c
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
int main(int argc, char **argv) {
    void* so = dlopen("./libso.so",RTLD_LAZY);
    printf("so: %p\n", so);
    if (!so) {
        fprintf(stderr, "%s\n", dlerror());
        exit(1);
    }
    dlerror();
    void (*fn)();
    fn = (void(*)())dlsym(so, "bejo_lib");
    printf("fn: %p\n", fn);
    if (fn) {
        fn("BEJO", 999);
    }
    dlclose(so);
    return 0;
}
// nm libso.so  | grep bejo
// 00000000000006c8 T bejo_lib
// gcc use.c -ldl -o use && ./use

The functions are mangled in the SO file libEsunnyQuot.so written in C++:
nm libEsunnyQuot.so | grep CreateEsunnyQuotClient
0000000000007c60 T _Z22CreateEsunnyQuotClientP17IEsunnyQuotNotify
nm libEsunnyQuot.so | grep DelEsunnyQuotClient
0000000000007c30 T _Z19DelEsunnyQuotClientP17IEsunnyQuotClient

Prepare the C++ user code:
vi sun.cpp
#include "EsunnyQuot.h"
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
int main(int argc, char **argv) {
    void* so = dlopen("./libEsunnyQuot.so",RTLD_LAZY);
    printf("so: %p\n", so);
    if (!so) {
        fprintf(stderr, "%s\n", dlerror());
        exit(1);
    }
    dlerror();
    void (*fn)(IEsunnyQuotClient*);
    fn = (void(*)(IEsunnyQuotClient*))dlsym(so, "_Z19DelEsunnyQuotClientP17IEsunnyQuotClient");
    printf("fn: %p\n", fn);
    if (fn) {
        fn(NULL);
    }
    dlclose(so);
    return 0;
}
// nm libEsunnyQuot.so | grep CreateEsunnyQuotClient
// 0000000000007c60 T _Z22CreateEsunnyQuotClientP17IEsunnyQuotNotify
// nm libEsunnyQuot.so | grep DelEsunnyQuotClient
// 0000000000007c30 T _Z19DelEsunnyQuotClientP17IEsunnyQuotClient
// gcc sun.cpp -ldl -o sun && ./sun

【谨慎使用】解决CTP在Linux开发中double free

原创文章，转载请注明： 转载自勤奋的小青蛙
本文链接地址: 【谨慎使用】解决CTP在Linux开发中double free

感谢网友：∮f(x)dx，徐冠鹏 提供的解决方法。

这份代码用于演示如何利用 dlopen 来避免 CTP GNU/Linux API 中 trader 和 mduser 两个库同时在一个进程中加载导致的 double free 问题。请注意，它只
用于演示如何避免 double free，其余为了能使这个程序能运行起来的代码没有任何实际意义，且不适合用于生产。所以这份代码仅供参考，因使用此代码引起
的任何损失，我不承担任何责任。

精力所限，下述的步骤的测试环境包含：

- 64 位 Gentoo Linux，内核版本 3.17.7-gentoo
- GCC Gentoo 4.8.3 p1.1, pie-0.5.9
- CTP GNU/Linux 版 6.3.0_20140811

1. 下载 http://www.sfit.com.cn/DocumentDown/api/6.3.0_20140811_traderapi_linux.tar并解压至工作目录：

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$ mkdir work $ cd work work $ wget http://www.sfit.com.cn/DocumentDown/api/6.3.0_20140811_traderapi_linux.tar work $ tar xf 6.3.0_20140811_traderapi_linux.tar work $ ls 6.3.0_20140811_traderapi_linux.tar  6.3.0_20140811_traderapi_linux32  6.3.0_20140811_traderapi_linux64

2. 将 Makefile、md_test.cc、trader_test.cc、x.cc 复制至包含 CTP 头文件及共享库的目录。这里是 64 位 GNU/Linux 的目录：

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1 2	$ cd 6.3.0_20140811_traderapi_linux64 $ cp .../{Makefile,md_test.cc,trader_test.cc,x.cc} .

这里需要把 "..." 换成包含这些文件的目录。

3. 重命名共享库文件：

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1 2	$ mv thostmduserapi.so libthostmduserapi.so $ mv thosttraderapi.so libthosttraderapi.so

4. 编译。这可以用 make 完成：

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$ make g++ -g -fPIC   -c -o x.o x.cc c++ -g -fPIC -o x x.o -ldl g++ -g -fPIC   -c -o trader_test.o trader_test.cc trader_test.cc: In function 'void init()': trader_test.cc:69:88: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]    user_api->RegisterFront ("tcp://asp-sim2-front1.financial-trading-platform.com:26205");                                                                                         ^ g++ -fPIC -shared -o libtrader_test.so trader_test.o -L. -lthosttraderapi -ldl g++ -g -fPIC   -c -o md_test.o md_test.cc md_test.cc: In function 'void init()': md_test.cc:75:88: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]    user_api->RegisterFront ("tcp://asp-sim2-front1.financial-trading-platform.com:26205");                                                                                         ^ g++ -fPIC -shared -o libmd_test.so md_test.o -L. -lthostmduserapi -ldl

5. 运行：

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$ LD_LIBRARY_PATH=. ./x trader front connected wlp3s0: Success md front connected wlp3s0: Success TRADER: 3: 综合交易平台：不合法的登录 MD: 3: 综合交易平台：不合法的登录 CThostFtdcUserApiImplBase::OnSessionDisconnected[0x7f80300008c8][1510735873][    0] CThostFtdcUserApiImplBase::OnSessionDisconnected[0x7f802c0008c8][1510735873][    0]

6. 说明：

trader_test.cc 中包含一个 trader SPI 的实现，编译后生成libtrader_test.so。md_test.cc 中包含一个 md SPI 的实现，编译后生成libmd_test.so。这两个文件各自使用 dlopen 加载对应的 CTP 共享库，并用RTLD_DEEPBIND 隔离两个共享库中冲突的符号。

x.cc 通过加载 libtrader_test.so 和 libmd_test.so 来使用 CTP 的功能。运行时，需要确保所有的共享库存在于系统搜索共享库的目录中，这可以通过配置ld.so.conf 或设置 LD_LIBRARY_PATH 环境变量来实现。配置 ld.so.conf 的方法请参考各发行版的手册，LD_LIBRARY_PATH 的设置方法见上面的例子。

Makefile

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CXXFLAGS += -g -fPIC   all:    x libtrader_test.so libmd_test.so   x:  x.o     c++ $(CXXFLAGS) -o x x.o -ldl   libtrader_test.so:  trader_test.o     $(CXX) -fPIC -shared -o libtrader_test.so trader_test.o -L. -lthosttraderapi -ldl   libmd_test.so:  md_test.o     $(CXX) -fPIC -shared -o libmd_test.so md_test.o -L. -lthostmduserapi -ldl   clean:     rm -f x *.o

md_test.cc

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#include <cstdio> #include <cstdlib> #include <cstring> #include <unistd.h> #include <dlfcn.h>   #include "ThostFtdcMdApi.h"   using namespace std;   volatile int child_finished = 0;   volatile int logging_in = 0;   class SimpleHandler: public CThostFtdcMdSpi {   CThostFtdcMdApi *user_api;   public:     SimpleHandler (CThostFtdcMdApi *user_api): user_api (user_api) { }     ~SimpleHandler () { }     virtual void OnFrontConnected ()   {     if (!logging_in++)       {     printf ("md front connected\n");     CThostFtdcReqUserLoginField user_login_req;     strcpy (user_login_req.BrokerID, "test_uid");     strcpy (user_login_req.UserID, "test_uid");     strcpy (user_login_req.Password, "password");     user_api->ReqUserLogin (&user_login_req, 0);       }   }     virtual void OnFrontDisconnected (int reason)   {     printf ("md front disconnected: %d\n", reason);   }     virtual void OnRspUserLogin (CThostFtdcRspUserLoginField *resp,                    CThostFtdcRspInfoField *info,                    int req_id, bool is_last)   {     printf ("MD: %d: %s\n", info->ErrorID, info->ErrorMsg);     if (info->ErrorID != 0)       child_finished = 1;   } };   CThostFtdcMdApi *user_api;   SimpleHandler *simple_handler;   extern "C" {   void init () {   void *trader_user_handle = dlopen ("libthostmduserapi.so",                      RTLD_LAZY | RTLD_DEEPBIND);   if (trader_user_handle == 0)     {       fprintf (stderr, "Cannot load libthostusermdapi.so\n");       exit (-1);     }     user_api = CThostFtdcMdApi::CreateFtdcMdApi ();     simple_handler = new SimpleHandler (user_api);   user_api->RegisterSpi (simple_handler);   user_api->RegisterFront ("tcp://asp-sim2-front1.financial-trading-platform.com:26205");   user_api->Init (); }   void finalize () {   user_api->RegisterSpi (0);   user_api->Release ();   delete simple_handler;   simple_handler = 0; }   }

trader_test.cc

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#include <cstdio> #include <cstdlib> #include <cstring> #include <unistd.h> #include <dlfcn.h>   #include "ThostFtdcTraderApi.h"   using namespace std;   volatile int child_finished = 0;   class SimpleHandler: public CThostFtdcTraderSpi {   CThostFtdcTraderApi *user_api;   public:     SimpleHandler (CThostFtdcTraderApi *user_api): user_api (user_api) { }     ~SimpleHandler () { }     virtual void OnFrontConnected ()   {     printf ("trader front connected\n");     CThostFtdcReqUserLoginField user_login_req;     strcpy (user_login_req.BrokerID, "test_uid");     strcpy (user_login_req.UserID, "test_uid");     strcpy (user_login_req.Password, "password");     user_api->ReqUserLogin (&user_login_req, 0);   }     virtual void OnFrontDisconnected (int reason)   {     printf ("trader front disconnected: %d\n", reason);   }     virtual void OnRspUserLogin (CThostFtdcRspUserLoginField *resp,                    CThostFtdcRspInfoField *info,                    int req_id, bool is_last)   {     printf ("TRADER: %d: %s\n", info->ErrorID, info->ErrorMsg);   } };   CThostFtdcTraderApi *user_api; SimpleHandler *simple_handler;   extern "C" {   void init () {   void *trader_user_handle = dlopen ("libthosttraderapi.so",                      RTLD_LAZY | RTLD_DEEPBIND);   if (trader_user_handle == 0)     {       fprintf (stderr, "Cannot load libthosttraderapi.so\n");       exit (-1);     }     user_api = CThostFtdcTraderApi::CreateFtdcTraderApi ();     simple_handler = new SimpleHandler (user_api);   user_api->RegisterSpi (simple_handler);   user_api->SubscribePrivateTopic (THOST_TERT_RESUME);   user_api->SubscribePublicTopic (THOST_TERT_RESUME);   user_api->RegisterFront ("tcp://asp-sim2-front1.financial-trading-platform.com:26205");   user_api->Init (); }   void finalize () {   user_api->RegisterSpi (0);   user_api->Release ();   delete simple_handler;   simple_handler = 0; }   }

x.cc

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#include <cstdio> #include <cstdlib> #include <cstring> #include <unistd.h> #include <dlfcn.h>   using namespace std;   int main (int argc, char *argv[]) {   void *trader_handle = dlopen ("libtrader_test.so", RTLD_LAZY);   if (trader_handle == 0)     {       fprintf (stderr, "Cannot load libtrader_test.so\n");       exit (-1);     }     void (*trader_init)() = (void (*)()) dlsym (trader_handle, "init");   void (*trader_finalize)() = (void (*)()) dlsym (trader_handle, "finalize");   trader_init ();     void *md_handle = dlopen ("libmd_test.so", RTLD_LAZY);   if (md_handle == 0)     {       fprintf (stderr, "Cannot load libmd_test.so\n");       exit (-1);     }     void (*md_init)() = (void (*)()) dlsym (md_handle, "init");   void (*md_finalize)() = (void (*)()) dlsym (md_handle, "finalize");   md_init ();     sleep (3);     md_finalize ();   trader_finalize ();     return 0; }

原创文章，转载请注明： 转载自勤奋的小青蛙
本文链接地址: 【谨慎使用】解决CTP在Linux开发中double free