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pythonnet/src/runtime/platform/LibraryLoader.cs at master · sdpython/pythonnet · GitHub
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LibraryLoader.cs
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platform
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LibraryLoader.cs
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using
System
;
using
System
.
ComponentModel
;
using
System
.
Runtime
.
InteropServices
;
namespace
Python
.
Runtime
.
Platform
{
interface
ILibraryLoader
{
IntPtr
Load
(
string
dllToLoad
)
;
IntPtr
GetFunction
(
IntPtr
hModule
,
string
procedureName
)
;
void
Free
(
IntPtr
hModule
)
;
}
static
class
LibraryLoader
{
static
ILibraryLoader
_instance
=
null
;
public
static
ILibraryLoader
Instance
{
get
{
if
(
_instance
==
null
)
{
if
(
RuntimeInformation
.
IsOSPlatform
(
OSPlatform
.
Windows
)
)
_instance
=
new
WindowsLoader
(
)
;
else
if
(
RuntimeInformation
.
IsOSPlatform
(
OSPlatform
.
Linux
)
)
_instance
=
new
LinuxLoader
(
)
;
else
if
(
RuntimeInformation
.
IsOSPlatform
(
OSPlatform
.
OSX
)
)
_instance
=
new
DarwinLoader
(
)
;
else
throw
new
PlatformNotSupportedException
(
"This operating system is not supported"
)
;
}
return
_instance
;
}
}
}
class
LinuxLoader
:
ILibraryLoader
{
private
static
int
RTLD_NOW
=
0x2
;
private
static
int
RTLD_GLOBAL
=
0x100
;
private
static
IntPtr
RTLD_DEFAULT
=
IntPtr
.
Zero
;
private
const
string
NativeDll
=
"libdl.so"
;
public
IntPtr
Load
(
string
dllToLoad
)
{
var
filename
=
$
"lib
{
dllToLoad
}
.so"
;
ClearError
(
)
;
var
res
=
dlopen
(
filename
,
RTLD_NOW
|
RTLD_GLOBAL
)
;
if
(
res
==
IntPtr
.
Zero
)
{
var
err
=
GetError
(
)
;
throw
new
DllNotFoundException
(
$
"Could not load
{
filename
}
with flags RTLD_NOW | RTLD_GLOBAL:
{
err
}
"
)
;
}
return
res
;
}
public
void
Free
(
IntPtr
handle
)
{
dlclose
(
handle
)
;
}
public
IntPtr
GetFunction
(
IntPtr
dllHandle
,
string
name
)
{
// look in the exe if dllHandle is NULL
if
(
dllHandle
==
IntPtr
.
Zero
)
{
dllHandle
=
RTLD_DEFAULT
;
}
ClearError
(
)
;
IntPtr
res
=
dlsym
(
dllHandle
,
name
)
;
if
(
res
==
IntPtr
.
Zero
)
{
var
err
=
GetError
(
)
;
throw
new
MissingMethodException
(
$
"Failed to load symbol
{
name
}
:
{
err
}
"
)
;
}
return
res
;
}
void
ClearError
(
)
{
dlerror
(
)
;
}
string
GetError
(
)
{
var
res
=
dlerror
(
)
;
if
(
res
!=
IntPtr
.
Zero
)
return
Marshal
.
PtrToStringAnsi
(
res
)
;
else
return
null
;
}
[
DllImport
(
NativeDll
,
CallingConvention
=
CallingConvention
.
Cdecl
,
CharSet
=
CharSet
.
Ansi
)
]
public
static
extern
IntPtr
dlopen
(
string
fileName
,
int
flags
)
;
[
DllImport
(
NativeDll
,
CallingConvention
=
CallingConvention
.
Cdecl
,
CharSet
=
CharSet
.
Ansi
)
]
private
static
extern
IntPtr
dlsym
(
IntPtr
handle
,
string
symbol
)
;
[
DllImport
(
NativeDll
,
CallingConvention
=
CallingConvention
.
Cdecl
)
]
private
static
extern
int
dlclose
(
IntPtr
handle
)
;
[
DllImport
(
NativeDll
,
CallingConvention
=
CallingConvention
.
Cdecl
)
]
private
static
extern
IntPtr
dlerror
(
)
;
}
class
DarwinLoader
:
ILibraryLoader
{
private
static
int
RTLD_NOW
=
0x2
;
private
static
int
RTLD_GLOBAL
=
0x8
;
private
const
string
NativeDll
=
"/usr/lib/libSystem.dylib"
;
private
static
IntPtr
RTLD_DEFAULT
=
new
IntPtr
(
-
2
)
;
public
IntPtr
Load
(
string
dllToLoad
)
{
var
filename
=
$
"lib
{
dllToLoad
}
.dylib"
;
ClearError
(
)
;
var
res
=
dlopen
(
filename
,
RTLD_NOW
|
RTLD_GLOBAL
)
;
if
(
res
==
IntPtr
.
Zero
)
{
var
err
=
GetError
(
)
;
throw
new
DllNotFoundException
(
$
"Could not load
{
filename
}
with flags RTLD_NOW | RTLD_GLOBAL:
{
err
}
"
)
;
}
return
res
;
}
public
void
Free
(
IntPtr
handle
)
{
dlclose
(
handle
)
;
}
public
IntPtr
GetFunction
(
IntPtr
dllHandle
,
string
name
)
{
// look in the exe if dllHandle is NULL
if
(
dllHandle
==
IntPtr
.
Zero
)
{
dllHandle
=
RTLD_DEFAULT
;
}
ClearError
(
)
;
IntPtr
res
=
dlsym
(
dllHandle
,
name
)
;
if
(
res
==
IntPtr
.
Zero
)
{
var
err
=
GetError
(
)
;
throw
new
MissingMethodException
(
$
"Failed to load symbol
{
name
}
:
{
err
}
"
)
;
}
return
res
;
}
void
ClearError
(
)
{
dlerror
(
)
;
}
string
GetError
(
)
{
var
res
=
dlerror
(
)
;
if
(
res
!=
IntPtr
.
Zero
)
return
Marshal
.
PtrToStringAnsi
(
res
)
;
else
return
null
;
}
[
DllImport
(
NativeDll
,
CallingConvention
=
CallingConvention
.
Cdecl
,
CharSet
=
CharSet
.
Ansi
)
]
public
static
extern
IntPtr
dlopen
(
String
fileName
,
int
flags
)
;
[
DllImport
(
NativeDll
,
CallingConvention
=
CallingConvention
.
Cdecl
,
CharSet
=
CharSet
.
Ansi
)
]
private
static
extern
IntPtr
dlsym
(
IntPtr
handle
,
String
symbol
)
;
[
DllImport
(
NativeDll
,
CallingConvention
=
CallingConvention
.
Cdecl
)
]
private
static
extern
int
dlclose
(
IntPtr
handle
)
;
[
DllImport
(
NativeDll
,
CallingConvention
=
CallingConvention
.
Cdecl
)
]
private
static
extern
IntPtr
dlerror
(
)
;
}
class
WindowsLoader
:
ILibraryLoader
{
private
const
string
NativeDll
=
"kernel32.dll"
;
public
IntPtr
Load
(
string
dllToLoad
)
{
var
res
=
WindowsLoader
.
LoadLibrary
(
dllToLoad
)
;
if
(
res
==
IntPtr
.
Zero
)
throw
new
DllNotFoundException
(
$
"Could not load
{
dllToLoad
}
"
,
new
Win32Exception
(
)
)
;
return
res
;
}
public
IntPtr
GetFunction
(
IntPtr
hModule
,
string
procedureName
)
{
var
res
=
WindowsLoader
.
GetProcAddress
(
hModule
,
procedureName
)
;
if
(
res
==
IntPtr
.
Zero
)
throw
new
MissingMethodException
(
$
"Failed to load symbol
{
procedureName
}
"
,
new
Win32Exception
(
)
)
;
return
res
;
}
public
void
Free
(
IntPtr
hModule
)
=>
WindowsLoader
.
FreeLibrary
(
hModule
)
;
[
DllImport
(
NativeDll
,
SetLastError
=
true
)
]
static
extern
IntPtr
LoadLibrary
(
string
dllToLoad
)
;
[
DllImport
(
NativeDll
,
SetLastError
=
true
)
]
static
extern
IntPtr
GetProcAddress
(
IntPtr
hModule
,
string
procedureName
)
;
[
DllImport
(
NativeDll
)
]
static
extern
bool
FreeLibrary
(
IntPtr
hModule
)
;
}
}
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