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:
$ 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:
$ 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:
$ mv thostmduserapi.so libthostmduserapi.so $ mv thosttraderapi.so libthosttraderapi.so
4. 编译。这可以用 make 完成:
$ 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:
$ 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
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
#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
#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
#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; }
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