Lib/ctypes/util.py - platform/external/python/cpython3 - Gitiles

 import sys, os
 import contextlib
 import subprocess

 # find_library(name) returns the pathname of a library, or None.
 if os.name == "nt":

     def _get_build_version():
         """Return the version of MSVC that was used to build Python.

         For Python 2.3 and up, the version number is included in
         sys.version.  For earlier versions, assume the compiler is MSVC 6.
         """
         # This function was copied from Lib/distutils/msvccompiler.py
         prefix = "MSC v."
         i = sys.version.find(prefix)
         if i == -1:
             return 6
         i = i + len(prefix)
         s, rest = sys.version[i:].split(" ", 1)
         majorVersion = int(s[:-2]) - 6
         if majorVersion >= 13:
             majorVersion += 1
         minorVersion = int(s[2:3]) / 10.0
         # I don't think paths are affected by minor version in version 6
         if majorVersion == 6:
             minorVersion = 0
         if majorVersion >= 6:
             return majorVersion + minorVersion
         # else we don't know what version of the compiler this is
         return None

     def find_msvcrt():
         """Return the name of the VC runtime dll"""
         version = _get_build_version()
         if version is None:
             # better be safe than sorry
             return None
         if version <= 6:
             clibname = 'msvcrt'
         elif version <= 13:
             clibname = 'msvcr%d' % (version * 10)
         else:
             # CRT is no longer directly loadable. See issue23606 for the
             # discussion about alternative approaches.
             return None

         # If python was built with in debug mode
         import importlib.machinery
         if '_d.pyd' in importlib.machinery.EXTENSION_SUFFIXES:
             clibname += 'd'
         return clibname+'.dll'

     def find_library(name):
         if name in ('c', 'm'):
             return find_msvcrt()
         # See MSDN for the REAL search order.
         for directory in os.environ['PATH'].split(os.pathsep):
             fname = os.path.join(directory, name)
             if os.path.isfile(fname):
                 return fname
             if fname.lower().endswith(".dll"):
                 continue
             fname = fname + ".dll"
             if os.path.isfile(fname):
                 return fname
         return None

 if os.name == "ce":
     # search path according to MSDN:
     # - absolute path specified by filename
     # - The .exe launch directory
     # - the Windows directory
     # - ROM dll files (where are they?)
     # - OEM specified search path: HKLM\Loader\SystemPath
     def find_library(name):
         return name

 if os.name == "posix" and sys.platform == "darwin":
     from ctypes.macholib.dyld import dyld_find as _dyld_find
     def find_library(name):
         possible = ['lib%s.dylib' % name,
                     '%s.dylib' % name,
                     '%s.framework/%s' % (name, name)]
         for name in possible:
             try:
                 return _dyld_find(name)
             except ValueError:
                 continue
         return None

 elif os.name == "posix":
     # Andreas Degert's find functions, using gcc, /sbin/ldconfig, objdump
     import re, tempfile

     def _findLib_gcc(name):
         expr = r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)
         fdout, ccout = tempfile.mkstemp()
         os.close(fdout)
         cmd = 'if type gcc >/dev/null 2>&1; then CC=gcc; elif type cc >/dev/null 2>&1; then CC=cc;else exit 10; fi;' \
               'LANG=C LC_ALL=C $CC -Wl,-t -o ' + ccout + ' 2>&1 -l' + name
         try:
             f = os.popen(cmd)
             try:
                 trace = f.read()
             finally:
                 rv = f.close()
         finally:
             try:
                 os.unlink(ccout)
             except FileNotFoundError:
                 pass
         if rv == 10:
             raise OSError('gcc or cc command not found')
         res = re.search(expr, trace)
         if not res:
             return None
         return res.group(0)


     if sys.platform == "sunos5":
         # use /usr/ccs/bin/dump on solaris
         def _get_soname(f):
             if not f:
                 return None
             cmd = "/usr/ccs/bin/dump -Lpv 2>/dev/null " + f
             with contextlib.closing(os.popen(cmd)) as f:
                 data = f.read()
             res = re.search(r'\[.*\]\sSONAME\s+([^\s]+)', data)
             if not res:
                 return None
             return res.group(1)
     else:
         def _get_soname(f):
             # assuming GNU binutils / ELF
             if not f:
                 return None
             cmd = 'if ! type objdump >/dev/null 2>&1; then exit 10; fi;' \
                   "objdump -p -j .dynamic 2>/dev/null " + f
             f = os.popen(cmd)
             try:
                 dump = f.read()
             finally:
                 rv = f.close()
             if rv == 10:
                 raise OSError('objdump command not found')
             res = re.search(r'\sSONAME\s+([^\s]+)', dump)
             if not res:
                 return None
             return res.group(1)

     if sys.platform.startswith(("freebsd", "openbsd", "dragonfly")):

         def _num_version(libname):
             # "libxyz.so.MAJOR.MINOR" => [ MAJOR, MINOR ]
             parts = libname.split(".")
             nums = []
             try:
                 while parts:
                     nums.insert(0, int(parts.pop()))
             except ValueError:
                 pass
             return nums or [ sys.maxsize ]

         def find_library(name):
             ename = re.escape(name)
             expr = r':-l%s\.\S+ => \S*/(lib%s\.\S+)' % (ename, ename)
             with contextlib.closing(os.popen('/sbin/ldconfig -r 2>/dev/null')) as f:
                 data = f.read()
             res = re.findall(expr, data)
             if not res:
                 return _get_soname(_findLib_gcc(name))
             res.sort(key=_num_version)
             return res[-1]

     elif sys.platform == "sunos5":

         def _findLib_crle(name, is64):
             if not os.path.exists('/usr/bin/crle'):
                 return None

             if is64:
                 cmd = 'env LC_ALL=C /usr/bin/crle -64 2>/dev/null'
             else:
                 cmd = 'env LC_ALL=C /usr/bin/crle 2>/dev/null'

             paths = None
             with contextlib.closing(os.popen(cmd)) as f:
                 for line in f.readlines():
                     line = line.strip()
                     if line.startswith('Default Library Path (ELF):'):
                         paths = line.split()[4]

             if not paths:
                 return None

             for dir in paths.split(":"):
                 libfile = os.path.join(dir, "lib%s.so" % name)
                 if os.path.exists(libfile):
                     return libfile

             return None

         def find_library(name, is64 = False):
             return _get_soname(_findLib_crle(name, is64) or _findLib_gcc(name))

     else:

         def _findSoname_ldconfig(name):
             import struct
             if struct.calcsize('l') == 4:
                 machine = os.uname().machine + '-32'
             else:
                 machine = os.uname().machine + '-64'
             mach_map = {
                 'x86_64-64': 'libc6,x86-64',
                 'ppc64-64': 'libc6,64bit',
                 'sparc64-64': 'libc6,64bit',
                 's390x-64': 'libc6,64bit',
                 'ia64-64': 'libc6,IA-64',
                 }
             abi_type = mach_map.get(machine, 'libc6')

             # XXX assuming GLIBC's ldconfig (with option -p)
             regex = r'\s+(lib%s\.[^\s]+)\s+\(%s'
             regex = os.fsencode(regex % (re.escape(name), abi_type))
             try:
                 with subprocess.Popen(['/sbin/ldconfig', '-p'],
                                       stdin=subprocess.DEVNULL,
                                       stderr=subprocess.DEVNULL,
                                       stdout=subprocess.PIPE,
                                       env={'LC_ALL': 'C', 'LANG': 'C'}) as p:
                     res = re.search(regex, p.stdout.read())
                     if res:
                         return os.fsdecode(res.group(1))
             except OSError:
                 pass

         def find_library(name):
             return _findSoname_ldconfig(name) or _get_soname(_findLib_gcc(name))

 ################################################################
 # test code

 def test():
     from ctypes import cdll
     if os.name == "nt":
         print(cdll.msvcrt)
         print(cdll.load("msvcrt"))
         print(find_library("msvcrt"))

     if os.name == "posix":
         # find and load_version
         print(find_library("m"))
         print(find_library("c"))
         print(find_library("bz2"))

         # getattr
 ##        print cdll.m
 ##        print cdll.bz2

         # load
         if sys.platform == "darwin":
             print(cdll.LoadLibrary("libm.dylib"))
             print(cdll.LoadLibrary("libcrypto.dylib"))
             print(cdll.LoadLibrary("libSystem.dylib"))
             print(cdll.LoadLibrary("System.framework/System"))
         else:
             print(cdll.LoadLibrary("libm.so"))
             print(cdll.LoadLibrary("libcrypt.so"))
             print(find_library("crypt"))

 if __name__ == "__main__":
     test()
	import sys, os
	import contextlib
	import subprocess

	# find_library(name) returns the pathname of a library, or None.
	if os.name == "nt":

	def _get_build_version():
	"""Return the version of MSVC that was used to build Python.

	For Python 2.3 and up, the version number is included in
	sys.version. For earlier versions, assume the compiler is MSVC 6.
	"""
	# This function was copied from Lib/distutils/msvccompiler.py
	prefix = "MSC v."
	i = sys.version.find(prefix)
	if i == -1:
	return 6
	i = i + len(prefix)
	s, rest = sys.version[i:].split(" ", 1)
	majorVersion = int(s[:-2]) - 6
	if majorVersion >= 13:
	majorVersion += 1
	minorVersion = int(s[2:3]) / 10.0
	# I don't think paths are affected by minor version in version 6
	if majorVersion == 6:
	minorVersion = 0
	if majorVersion >= 6:
	return majorVersion + minorVersion
	# else we don't know what version of the compiler this is
	return None

	def find_msvcrt():
	"""Return the name of the VC runtime dll"""
	version = _get_build_version()
	if version is None:
	# better be safe than sorry
	return None
	if version <= 6:
	clibname = 'msvcrt'
	elif version <= 13:
	clibname = 'msvcr%d' % (version * 10)
	else:
	# CRT is no longer directly loadable. See issue23606 for the
	# discussion about alternative approaches.
	return None

	# If python was built with in debug mode
	import importlib.machinery
	if '_d.pyd' in importlib.machinery.EXTENSION_SUFFIXES:
	clibname += 'd'
	return clibname+'.dll'

	def find_library(name):
	if name in ('c', 'm'):
	return find_msvcrt()
	# See MSDN for the REAL search order.
	for directory in os.environ['PATH'].split(os.pathsep):
	fname = os.path.join(directory, name)
	if os.path.isfile(fname):
	return fname
	if fname.lower().endswith(".dll"):
	continue
	fname = fname + ".dll"
	if os.path.isfile(fname):
	return fname
	return None

	if os.name == "ce":
	# search path according to MSDN:
	# - absolute path specified by filename
	# - The .exe launch directory
	# - the Windows directory
	# - ROM dll files (where are they?)
	# - OEM specified search path: HKLM\Loader\SystemPath
	def find_library(name):
	return name

	if os.name == "posix" and sys.platform == "darwin":
	from ctypes.macholib.dyld import dyld_find as _dyld_find
	def find_library(name):
	possible = ['lib%s.dylib' % name,
	'%s.dylib' % name,
	'%s.framework/%s' % (name, name)]
	for name in possible:
	try:
	return _dyld_find(name)
	except ValueError:
	continue
	return None

	elif os.name == "posix":
	# Andreas Degert's find functions, using gcc, /sbin/ldconfig, objdump
	import re, tempfile

	def _findLib_gcc(name):
	expr = r'[^\(\)\s]lib%s\.[^\(\)\s]' % re.escape(name)
	fdout, ccout = tempfile.mkstemp()
	os.close(fdout)
	cmd = 'if type gcc >/dev/null 2>&1; then CC=gcc; elif type cc >/dev/null 2>&1; then CC=cc;else exit 10; fi;' \
	'LANG=C LC_ALL=C $CC -Wl,-t -o ' + ccout + ' 2>&1 -l' + name
	try:
	f = os.popen(cmd)
	try:
	trace = f.read()
	finally:
	rv = f.close()
	finally:
	try:
	os.unlink(ccout)
	except FileNotFoundError:
	pass
	if rv == 10:
	raise OSError('gcc or cc command not found')
	res = re.search(expr, trace)
	if not res:
	return None
	return res.group(0)


	if sys.platform == "sunos5":
	# use /usr/ccs/bin/dump on solaris
	def _get_soname(f):
	if not f:
	return None
	cmd = "/usr/ccs/bin/dump -Lpv 2>/dev/null " + f
	with contextlib.closing(os.popen(cmd)) as f:
	data = f.read()
	res = re.search(r'\[.*\]\sSONAME\s+([^\s]+)', data)
	if not res:
	return None
	return res.group(1)
	else:
	def _get_soname(f):
	# assuming GNU binutils / ELF
	if not f:
	return None
	cmd = 'if ! type objdump >/dev/null 2>&1; then exit 10; fi;' \
	"objdump -p -j .dynamic 2>/dev/null " + f
	f = os.popen(cmd)
	try:
	dump = f.read()
	finally:
	rv = f.close()
	if rv == 10:
	raise OSError('objdump command not found')
	res = re.search(r'\sSONAME\s+([^\s]+)', dump)
	if not res:
	return None
	return res.group(1)

	if sys.platform.startswith(("freebsd", "openbsd", "dragonfly")):

	def _num_version(libname):
	# "libxyz.so.MAJOR.MINOR" => [ MAJOR, MINOR ]
	parts = libname.split(".")
	nums = []
	try:
	while parts:
	nums.insert(0, int(parts.pop()))
	except ValueError:
	pass
	return nums or [ sys.maxsize ]

	def find_library(name):
	ename = re.escape(name)
	expr = r':-l%s\.\S+ => \S*/(lib%s\.\S+)' % (ename, ename)
	with contextlib.closing(os.popen('/sbin/ldconfig -r 2>/dev/null')) as f:
	data = f.read()
	res = re.findall(expr, data)
	if not res:
	return _get_soname(_findLib_gcc(name))
	res.sort(key=_num_version)
	return res[-1]

	elif sys.platform == "sunos5":

	def _findLib_crle(name, is64):
	if not os.path.exists('/usr/bin/crle'):
	return None

	if is64:
	cmd = 'env LC_ALL=C /usr/bin/crle -64 2>/dev/null'
	else:
	cmd = 'env LC_ALL=C /usr/bin/crle 2>/dev/null'

	paths = None
	with contextlib.closing(os.popen(cmd)) as f:
	for line in f.readlines():
	line = line.strip()
	if line.startswith('Default Library Path (ELF):'):
	paths = line.split()[4]

	if not paths:
	return None

	for dir in paths.split(":"):
	libfile = os.path.join(dir, "lib%s.so" % name)
	if os.path.exists(libfile):
	return libfile

	return None

	def find_library(name, is64 = False):
	return _get_soname(_findLib_crle(name, is64) or _findLib_gcc(name))

	else:

	def _findSoname_ldconfig(name):
	import struct
	if struct.calcsize('l') == 4:
	machine = os.uname().machine + '-32'
	else:
	machine = os.uname().machine + '-64'
	mach_map = {
	'x86_64-64': 'libc6,x86-64',
	'ppc64-64': 'libc6,64bit',
	'sparc64-64': 'libc6,64bit',
	's390x-64': 'libc6,64bit',
	'ia64-64': 'libc6,IA-64',
	}
	abi_type = mach_map.get(machine, 'libc6')

	# XXX assuming GLIBC's ldconfig (with option -p)
	regex = r'\s+(lib%s\.[^\s]+)\s+\(%s'
	regex = os.fsencode(regex % (re.escape(name), abi_type))
	try:
	with subprocess.Popen(['/sbin/ldconfig', '-p'],
	stdin=subprocess.DEVNULL,
	stderr=subprocess.DEVNULL,
	stdout=subprocess.PIPE,
	env={'LC_ALL': 'C', 'LANG': 'C'}) as p:
	res = re.search(regex, p.stdout.read())
	if res:
	return os.fsdecode(res.group(1))
	except OSError:
	pass

	def find_library(name):
	return _findSoname_ldconfig(name) or _get_soname(_findLib_gcc(name))

	################################################################
	# test code

	def test():
	from ctypes import cdll
	if os.name == "nt":
	print(cdll.msvcrt)
	print(cdll.load("msvcrt"))
	print(find_library("msvcrt"))

	if os.name == "posix":
	# find and load_version
	print(find_library("m"))
	print(find_library("c"))
	print(find_library("bz2"))

	# getattr
	## print cdll.m
	## print cdll.bz2

	# load
	if sys.platform == "darwin":
	print(cdll.LoadLibrary("libm.dylib"))
	print(cdll.LoadLibrary("libcrypto.dylib"))
	print(cdll.LoadLibrary("libSystem.dylib"))
	print(cdll.LoadLibrary("System.framework/System"))
	else:
	print(cdll.LoadLibrary("libm.so"))
	print(cdll.LoadLibrary("libcrypt.so"))
	print(find_library("crypt"))

	if __name__ == "__main__":
	test()