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Clément Péron
918fb3aec9
Provides a fallback name for the ObjC runtime library on iOS, and improved error handling when that library cannot be loaded.
75 lines
2.8 KiB
Python
75 lines
2.8 KiB
Python
import sys
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try:
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from ctypes import cdll, c_void_p, c_char_p, util
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except ImportError:
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# ctypes is an optional module. If it's not present, we're limited in what
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# we can tell about the system, but we don't want to prevent the module
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# from working.
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print("ctypes isn't available; iOS system calls will not be available", file=sys.stderr)
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objc = None
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else:
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# ctypes is available. Load the ObjC library, and wrap the objc_getClass,
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# sel_registerName methods
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# find_library() resolves a system library through the dyld shared cache,
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# which needs _dyld_shared_cache_contains_path(); that is unavailable before
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# iOS 14, so fall back to the bare name, which dyld resolves by itself.
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lib = util.find_library("objc") or "libobjc.dylib"
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try:
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objc = cdll.LoadLibrary(lib)
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except OSError:
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raise ImportError("ObjC runtime library couldn't be loaded")
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objc.objc_getClass.restype = c_void_p
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objc.objc_getClass.argtypes = [c_char_p]
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objc.sel_registerName.restype = c_void_p
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objc.sel_registerName.argtypes = [c_char_p]
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def get_platform_ios():
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# Determine if this is a simulator using the multiarch value
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is_simulator = sys.implementation._multiarch.endswith("simulator")
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# We can't use ctypes; abort
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if not objc:
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return None
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# Most of the methods return ObjC objects
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objc.objc_msgSend.restype = c_void_p
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# All the methods used have no arguments.
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objc.objc_msgSend.argtypes = [c_void_p, c_void_p]
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# Equivalent of:
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# device = [UIDevice currentDevice]
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UIDevice = objc.objc_getClass(b"UIDevice")
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SEL_currentDevice = objc.sel_registerName(b"currentDevice")
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device = objc.objc_msgSend(UIDevice, SEL_currentDevice)
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# Equivalent of:
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# device_systemVersion = [device systemVersion]
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SEL_systemVersion = objc.sel_registerName(b"systemVersion")
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device_systemVersion = objc.objc_msgSend(device, SEL_systemVersion)
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# Equivalent of:
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# device_systemName = [device systemName]
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SEL_systemName = objc.sel_registerName(b"systemName")
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device_systemName = objc.objc_msgSend(device, SEL_systemName)
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# Equivalent of:
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# device_model = [device model]
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SEL_model = objc.sel_registerName(b"model")
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device_model = objc.objc_msgSend(device, SEL_model)
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# UTF8String returns a const char*;
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SEL_UTF8String = objc.sel_registerName(b"UTF8String")
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objc.objc_msgSend.restype = c_char_p
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# Equivalent of:
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# system = [device_systemName UTF8String]
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# release = [device_systemVersion UTF8String]
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# model = [device_model UTF8String]
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system = objc.objc_msgSend(device_systemName, SEL_UTF8String).decode()
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release = objc.objc_msgSend(device_systemVersion, SEL_UTF8String).decode()
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model = objc.objc_msgSend(device_model, SEL_UTF8String).decode()
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return system, release, model, is_simulator
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