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#
include
<
Python.h
>
#
include
<
err.h
>
#
include
"
extapi.hpp
"
#
ifdef
__NT__
#
include
<
windows.h
>
#
include
<
psapi.h
>
//
-------------------------------------------------------------------------
bool
ext_api_t::load
(qstring *errbuf)
{
QASSERT
(
30602
, lib_path.
empty
() && lib_handle ==
nullptr
);
//
Inspired by https://docs.microsoft.com/en-us/windows/win32/psapi/enumerating-all-modules-for-a-process
HANDLE
hProcess =
GetCurrentProcess
();
HMODULE
hMods[
1024
];
DWORD
cbNeeded;
if
(
EnumProcessModules
(hProcess, hMods,
sizeof
(hMods), &cbNeeded) ==
0
)
return
false
;
const
void
*wanted = (
const
void
*) Py_IsInitialized;
for
(
size_t
i =
0
; i < (cbNeeded /
sizeof
(
HMODULE
)); i++ )
{
MODULEINFO
module_info;
if
(
GetModuleInformation
(hProcess, hMods[i], &module_info,
sizeof
(module_info)) )
{
if
( wanted >= module_info.
lpBaseOfDll
)
{
LPVOID
end = (
LPVOID
) ((
const
char
*) module_info.
lpBaseOfDll
+ module_info.
SizeOfImage
);
if
( wanted < end )
{
//
found module
lib_handle = (
void
*) hMods[i];
break
;
}
}
}
}
if
( lib_handle ==
nullptr
)
return
false
;
#
define
BIND_SYMBOL_x
(
Name, fail
) \
do
\
{ \
* (
FARPROC
*) &Name ## _ptr =
GetProcAddress
( \
(
HMODULE
) lib_handle,
TEXT
(#Name)); \
if
( Name ## _ptr ==
nullptr
&& fail ) \
{ \
errbuf->
sprnt
(
"
GetProcAddress(
\"
%s
\"
) failed: %s
"
, \
#Name,
qstrerror
(-
1
)); \
return
false
; \
} \
}
while
(
0
)
#
define
BIND_SYMBOL
(
Name
) BIND_SYMBOL_x(Name,
true
)
#
define
BIND_SYMBOL_WEAK
(
Name
) BIND_SYMBOL_x(Name,
false
)
BIND_SYMBOL
(PyEval_SetTrace);
BIND_SYMBOL
(PyRun_SimpleStringFlags);
BIND_SYMBOL
(PyRun_StringFlags);
#
if
PY_MAJOR_VERSION < 3
BIND_SYMBOL
(Py_CompileString);
#
else
BIND_SYMBOL
(Py_CompileStringExFlags);
#
endif
BIND_SYMBOL
(PyFunction_New);
BIND_SYMBOL
(PyFunction_GetCode);
BIND_SYMBOL
(_PyLong_AsByteArray);
BIND_SYMBOL_WEAK
(PyEval_ThreadsInitialized);
BIND_SYMBOL_WEAK
(PyEval_InitThreads);
BIND_SYMBOL_WEAK
(Py_NoSiteFlag);
#
undef
BIND_SYMBOL
return
true
;
}
//
-------------------------------------------------------------------------
void
ext_api_t::clear
()
{
lib_handle =
nullptr
;
}
#
else
#
include
<
dlfcn.h
>
//
-------------------------------------------------------------------------
bool
ext_api_t::load
(qstring *errbuf)
{
if
( !lib_path.
empty
() && lib_handle !=
nullptr
)
{
return
true
;
}
//
QASSERT(30603, lib_path.empty() && lib_handle == nullptr);
//
first, check if we have global symbols
if
(
dlsym
(
RTLD_DEFAULT
,
"
Py_IsInitialized
"
) !=
nullptr
)
lib_handle =
RTLD_DEFAULT
;
else
{
//
otherwise, look for shared library to import from
Dl_info dl_info;
memset
(&dl_info,
0
,
sizeof
(dl_info));
int
rc =
dladdr
((
void
*) Py_IsInitialized, &dl_info);
if
( rc ==
0
)
{
*errbuf =
"
Cannot determine path to shared object
"
;
return
false
;
}
lib_path = dl_info.
dli_fname
;
lib_handle =
dlopen
(lib_path.
c_str
(),
RTLD_NOLOAD
|
RTLD_GLOBAL
|
RTLD_LAZY
);
if
( lib_handle ==
nullptr
)
{
errbuf->
sprnt
(
"
dlopen(
\"
%s
\"
) failed: %s
"
, lib_path.
c_str
(),
qstrerror
(-
1
));
return
false
;
}
}
#
define
BIND_SYMBOL
(
Name
) \
do
\
{ \
Name ## _ptr = (Name ## _t *)
dlsym
(lib_handle, #Name); \
if
( Name ## _ptr ==
nullptr
) \
{ \
errbuf->
sprnt
(
"
dlsym(
\"
%s
\"
) failed: %s
"
, #Name,
qstrerror
(-
1
)); \
return
false
; \
} \
}
while
(
0
)
BIND_SYMBOL
(PyEval_SetTrace);
BIND_SYMBOL
(PyRun_SimpleStringFlags);
BIND_SYMBOL
(PyRun_StringFlags);
#
if
PY_MAJOR_VERSION < 3
BIND_SYMBOL
(Py_CompileString);
#
else
BIND_SYMBOL
(Py_CompileStringExFlags);
#
endif
BIND_SYMBOL
(PyFunction_New);
BIND_SYMBOL
(PyFunction_GetCode);
BIND_SYMBOL
(_PyLong_AsByteArray);
BIND_SYMBOL
(Py_NoSiteFlag);
#
undef
BIND_SYMBOL
return
true
;
}
//
-------------------------------------------------------------------------
void
ext_api_t::clear
()
{
if
( lib_handle !=
nullptr
)
{
if
( lib_handle !=
RTLD_DEFAULT
)
dlclose
(lib_handle);
lib_handle =
nullptr
;
}
}
#
endif
ext_api_t
extapi;
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