237 lines
7.8 KiB
Python
237 lines
7.8 KiB
Python
import sys, os
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import contextlib
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import subprocess
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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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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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else:
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clibname = 'msvcr%d' % (version * 10)
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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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if os.name == "ce":
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# search path according to MSDN:
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# - absolute path specified by filename
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# - The .exe launch directory
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# - the Windows directory
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# - ROM dll files (where are they?)
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# - OEM specified search path: HKLM\Loader\SystemPath
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def find_library(name):
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return name
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if 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 os.name == "posix":
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# Andreas Degert's find functions, using gcc, /sbin/ldconfig, objdump
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import re, tempfile, errno
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def _findLib_gcc(name):
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expr = r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)
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fdout, ccout = tempfile.mkstemp()
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os.close(fdout)
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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;' \
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'$CC -Wl,-t -o ' + ccout + ' 2>&1 -l' + name
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try:
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f = os.popen(cmd)
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try:
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trace = f.read()
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finally:
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rv = f.close()
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finally:
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try:
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os.unlink(ccout)
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except OSError as e:
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if e.errno != errno.ENOENT:
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raise
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if rv == 10:
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raise OSError('gcc or cc command not found')
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res = re.search(expr, trace)
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if not res:
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return None
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return res.group(0)
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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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cmd = "/usr/ccs/bin/dump -Lpv 2>/dev/null " + f
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with contextlib.closing(os.popen(cmd)) as f:
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data = f.read()
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res = re.search(r'\[.*\]\sSONAME\s+([^\s]+)', data)
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if not res:
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return None
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return 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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cmd = 'if ! type objdump >/dev/null 2>&1; then exit 10; fi;' \
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"objdump -p -j .dynamic 2>/dev/null " + f
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f = os.popen(cmd)
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dump = f.read()
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rv = f.close()
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if rv == 10:
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raise OSError('objdump command not found')
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res = re.search(r'\sSONAME\s+([^\s]+)', dump)
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if not res:
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return None
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return 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(".")
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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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with contextlib.closing(os.popen('/sbin/ldconfig -r 2>/dev/null')) as f:
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data = f.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 res[-1]
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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()[4] + '-32'
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else:
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machine = os.uname()[4] + '-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 = os.fsencode(
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'\s+(lib%s\.[^\s]+)\s+\(%s' % (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 find_library(name):
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return _findSoname_ldconfig(name) or _get_soname(_findLib_gcc(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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# getattr
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## print cdll.m
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## print cdll.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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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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