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376 lines
14 KiB
Python
376 lines
14 KiB
Python
import os
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import shutil
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import subprocess
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import sys
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# find_library(name) returns the pathname of a library, or None.
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if os.name == "nt":
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def _get_build_version():
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"""Return the version of MSVC that was used to build Python.
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For Python 2.3 and up, the version number is included in
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sys.version. For earlier versions, assume the compiler is MSVC 6.
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"""
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# This function was copied from Lib/distutils/msvccompiler.py
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prefix = "MSC v."
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i = sys.version.find(prefix)
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if i == -1:
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return 6
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i = i + len(prefix)
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s, rest = sys.version[i:].split(" ", 1)
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majorVersion = int(s[:-2]) - 6
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if majorVersion >= 13:
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majorVersion += 1
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minorVersion = int(s[2:3]) / 10.0
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# I don't think paths are affected by minor version in version 6
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if majorVersion == 6:
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minorVersion = 0
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if majorVersion >= 6:
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return majorVersion + minorVersion
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# else we don't know what version of the compiler this is
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return None
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def find_msvcrt():
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"""Return the name of the VC runtime dll"""
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version = _get_build_version()
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if version is None:
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# better be safe than sorry
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return None
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if version <= 6:
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clibname = 'msvcrt'
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elif version <= 13:
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clibname = 'msvcr%d' % (version * 10)
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else:
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# CRT is no longer directly loadable. See issue23606 for the
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# discussion about alternative approaches.
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return None
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# If python was built with in debug mode
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import importlib.machinery
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if '_d.pyd' in importlib.machinery.EXTENSION_SUFFIXES:
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clibname += 'd'
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return clibname+'.dll'
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def find_library(name):
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if name in ('c', 'm'):
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return find_msvcrt()
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# See MSDN for the REAL search order.
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for directory in os.environ['PATH'].split(os.pathsep):
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fname = os.path.join(directory, name)
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if os.path.isfile(fname):
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return fname
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if fname.lower().endswith(".dll"):
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continue
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fname = fname + ".dll"
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if os.path.isfile(fname):
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return fname
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return None
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elif os.name == "posix" and sys.platform == "darwin":
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from ctypes.macholib.dyld import dyld_find as _dyld_find
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def find_library(name):
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possible = ['lib%s.dylib' % name,
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'%s.dylib' % name,
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'%s.framework/%s' % (name, name)]
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for name in possible:
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try:
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return _dyld_find(name)
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except ValueError:
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continue
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return None
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elif sys.platform.startswith("aix"):
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# AIX has two styles of storing shared libraries
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# GNU auto_tools refer to these as svr4 and aix
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# svr4 (System V Release 4) is a regular file, often with .so as suffix
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# AIX style uses an archive (suffix .a) with members (e.g., shr.o, libssl.so)
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# see issue#26439 and _aix.py for more details
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from ctypes._aix import find_library
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elif os.name == "posix":
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# Andreas Degert's find functions, using gcc, /sbin/ldconfig, objdump
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import re, tempfile
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def _is_elf(filename):
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"Return True if the given file is an ELF file"
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elf_header = b'\x7fELF'
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with open(filename, 'br') as thefile:
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return thefile.read(4) == elf_header
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def _findLib_gcc(name):
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# Run GCC's linker with the -t (aka --trace) option and examine the
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# library name it prints out. The GCC command will fail because we
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# haven't supplied a proper program with main(), but that does not
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# matter.
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expr = os.fsencode(r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name))
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c_compiler = shutil.which('gcc')
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if not c_compiler:
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c_compiler = shutil.which('cc')
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if not c_compiler:
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# No C compiler available, give up
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return None
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temp = tempfile.NamedTemporaryFile()
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try:
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args = [c_compiler, '-Wl,-t', '-o', temp.name, '-l' + name]
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env = dict(os.environ)
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env['LC_ALL'] = 'C'
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env['LANG'] = 'C'
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try:
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proc = subprocess.Popen(args,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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env=env)
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except OSError: # E.g. bad executable
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return None
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with proc:
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trace = proc.stdout.read()
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finally:
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try:
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temp.close()
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except FileNotFoundError:
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# Raised if the file was already removed, which is the normal
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# behaviour of GCC if linking fails
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pass
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res = re.findall(expr, trace)
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if not res:
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return None
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for file in res:
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# Check if the given file is an elf file: gcc can report
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# some files that are linker scripts and not actual
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# shared objects. See bpo-41976 for more details
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if not _is_elf(file):
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continue
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return os.fsdecode(file)
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if sys.platform == "sunos5":
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# use /usr/ccs/bin/dump on solaris
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def _get_soname(f):
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if not f:
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return None
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try:
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proc = subprocess.Popen(("/usr/ccs/bin/dump", "-Lpv", f),
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stdout=subprocess.PIPE,
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stderr=subprocess.DEVNULL)
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except OSError: # E.g. command not found
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return None
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with proc:
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data = proc.stdout.read()
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res = re.search(br'\[.*\]\sSONAME\s+([^\s]+)', data)
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if not res:
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return None
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return os.fsdecode(res.group(1))
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else:
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def _get_soname(f):
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# assuming GNU binutils / ELF
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if not f:
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return None
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objdump = shutil.which('objdump')
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if not objdump:
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# objdump is not available, give up
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return None
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try:
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proc = subprocess.Popen((objdump, '-p', '-j', '.dynamic', f),
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stdout=subprocess.PIPE,
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stderr=subprocess.DEVNULL)
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except OSError: # E.g. bad executable
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return None
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with proc:
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dump = proc.stdout.read()
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res = re.search(br'\sSONAME\s+([^\s]+)', dump)
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if not res:
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return None
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return os.fsdecode(res.group(1))
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if sys.platform.startswith(("freebsd", "openbsd", "dragonfly")):
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def _num_version(libname):
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# "libxyz.so.MAJOR.MINOR" => [ MAJOR, MINOR ]
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parts = libname.split(b".")
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nums = []
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try:
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while parts:
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nums.insert(0, int(parts.pop()))
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except ValueError:
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pass
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return nums or [sys.maxsize]
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def find_library(name):
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ename = re.escape(name)
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expr = r':-l%s\.\S+ => \S*/(lib%s\.\S+)' % (ename, ename)
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expr = os.fsencode(expr)
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try:
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proc = subprocess.Popen(('/sbin/ldconfig', '-r'),
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stdout=subprocess.PIPE,
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stderr=subprocess.DEVNULL)
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except OSError: # E.g. command not found
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data = b''
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else:
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with proc:
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data = proc.stdout.read()
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res = re.findall(expr, data)
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if not res:
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return _get_soname(_findLib_gcc(name))
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res.sort(key=_num_version)
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return os.fsdecode(res[-1])
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elif sys.platform == "sunos5":
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def _findLib_crle(name, is64):
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if not os.path.exists('/usr/bin/crle'):
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return None
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env = dict(os.environ)
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env['LC_ALL'] = 'C'
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if is64:
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args = ('/usr/bin/crle', '-64')
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else:
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args = ('/usr/bin/crle',)
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paths = None
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try:
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proc = subprocess.Popen(args,
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stdout=subprocess.PIPE,
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stderr=subprocess.DEVNULL,
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env=env)
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except OSError: # E.g. bad executable
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return None
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with proc:
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for line in proc.stdout:
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line = line.strip()
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if line.startswith(b'Default Library Path (ELF):'):
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paths = os.fsdecode(line).split()[4]
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if not paths:
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return None
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for dir in paths.split(":"):
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libfile = os.path.join(dir, "lib%s.so" % name)
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if os.path.exists(libfile):
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return libfile
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return None
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def find_library(name, is64 = False):
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return _get_soname(_findLib_crle(name, is64) or _findLib_gcc(name))
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else:
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def _findSoname_ldconfig(name):
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import struct
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if struct.calcsize('l') == 4:
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machine = os.uname().machine + '-32'
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else:
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machine = os.uname().machine + '-64'
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mach_map = {
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'x86_64-64': 'libc6,x86-64',
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'ppc64-64': 'libc6,64bit',
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'sparc64-64': 'libc6,64bit',
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's390x-64': 'libc6,64bit',
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'ia64-64': 'libc6,IA-64',
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}
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abi_type = mach_map.get(machine, 'libc6')
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# XXX assuming GLIBC's ldconfig (with option -p)
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regex = r'\s+(lib%s\.[^\s]+)\s+\(%s'
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regex = os.fsencode(regex % (re.escape(name), abi_type))
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try:
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with subprocess.Popen(['/sbin/ldconfig', '-p'],
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stdin=subprocess.DEVNULL,
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stderr=subprocess.DEVNULL,
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stdout=subprocess.PIPE,
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env={'LC_ALL': 'C', 'LANG': 'C'}) as p:
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res = re.search(regex, p.stdout.read())
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if res:
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return os.fsdecode(res.group(1))
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except OSError:
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pass
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def _findLib_ld(name):
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# See issue #9998 for why this is needed
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expr = r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)
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cmd = ['ld', '-t']
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libpath = os.environ.get('LD_LIBRARY_PATH')
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if libpath:
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for d in libpath.split(':'):
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cmd.extend(['-L', d])
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cmd.extend(['-o', os.devnull, '-l%s' % name])
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result = None
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try:
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p = subprocess.Popen(cmd, stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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universal_newlines=True)
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out, _ = p.communicate()
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res = re.findall(expr, os.fsdecode(out))
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for file in res:
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# Check if the given file is an elf file: gcc can report
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# some files that are linker scripts and not actual
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# shared objects. See bpo-41976 for more details
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if not _is_elf(file):
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continue
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return os.fsdecode(file)
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except Exception:
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pass # result will be None
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return result
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def find_library(name):
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# See issue #9998
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return _findSoname_ldconfig(name) or \
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_get_soname(_findLib_gcc(name)) or _get_soname(_findLib_ld(name))
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################################################################
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# test code
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def test():
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from ctypes import cdll
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if os.name == "nt":
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print(cdll.msvcrt)
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print(cdll.load("msvcrt"))
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print(find_library("msvcrt"))
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if os.name == "posix":
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# find and load_version
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print(find_library("m"))
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print(find_library("c"))
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print(find_library("bz2"))
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# load
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if sys.platform == "darwin":
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print(cdll.LoadLibrary("libm.dylib"))
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print(cdll.LoadLibrary("libcrypto.dylib"))
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print(cdll.LoadLibrary("libSystem.dylib"))
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print(cdll.LoadLibrary("System.framework/System"))
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# issue-26439 - fix broken test call for AIX
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elif sys.platform.startswith("aix"):
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from ctypes import CDLL
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if sys.maxsize < 2**32:
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print(f"Using CDLL(name, os.RTLD_MEMBER): {CDLL('libc.a(shr.o)', os.RTLD_MEMBER)}")
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print(f"Using cdll.LoadLibrary(): {cdll.LoadLibrary('libc.a(shr.o)')}")
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# librpm.so is only available as 32-bit shared library
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print(find_library("rpm"))
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print(cdll.LoadLibrary("librpm.so"))
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else:
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print(f"Using CDLL(name, os.RTLD_MEMBER): {CDLL('libc.a(shr_64.o)', os.RTLD_MEMBER)}")
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print(f"Using cdll.LoadLibrary(): {cdll.LoadLibrary('libc.a(shr_64.o)')}")
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print(f"crypt\t:: {find_library('crypt')}")
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print(f"crypt\t:: {cdll.LoadLibrary(find_library('crypt'))}")
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print(f"crypto\t:: {find_library('crypto')}")
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print(f"crypto\t:: {cdll.LoadLibrary(find_library('crypto'))}")
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else:
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print(cdll.LoadLibrary("libm.so"))
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print(cdll.LoadLibrary("libcrypt.so"))
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print(find_library("crypt"))
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if __name__ == "__main__":
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test()
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